fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57
  58 #include "nfs4_fs.h"
  59 #include "delegation.h"
  60 #include "internal.h"
  61 #include "iostat.h"
  62 #include "callback.h"
  63 #include "pnfs.h"
  64 #include "netns.h"
  65 #include "nfs4idmap.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 /* file attributes which can be mapped to nfs attributes */
  77 #define NFS4_VALID_ATTRS (ATTR_MODE \
  78         | ATTR_UID \
  79         | ATTR_GID \
  80         | ATTR_SIZE \
  81         | ATTR_ATIME \
  82         | ATTR_MTIME \
  83         | ATTR_CTIME \
  84         | ATTR_ATIME_SET \
  85         | ATTR_MTIME_SET)
  86
  87 struct nfs4_opendata;
  88 static int _nfs4_proc_open(struct nfs4_opendata *data);
  89 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  90 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  91 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  92 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  93 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  94 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  95                             struct nfs_fattr *fattr, struct iattr *sattr,
  96                             struct nfs_open_context *ctx, struct nfs4_label *ilabel,
  97                             struct nfs4_label *olabel);
  98 #ifdef CONFIG_NFS_V4_1
  99 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 100                 struct rpc_cred *);
 101 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 102                 struct rpc_cred *, bool);
 103 #endif
 104
 105 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 106 static inline struct nfs4_label *
 107 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 108         struct iattr *sattr, struct nfs4_label *label)
 109 {
 110         int err;
 111
 112         if (label == NULL)
 113                 return NULL;
 114
 115         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 116                 return NULL;
 117
 118         err = security_dentry_init_security(dentry, sattr->ia_mode,
 119                                 &dentry->d_name, (void **)&label->label, &label->len);
 120         if (err == 0)
 121                 return label;
 122
 123         return NULL;
 124 }
 125 static inline void
 126 nfs4_label_release_security(struct nfs4_label *label)
 127 {
 128         if (label)
 129                 security_release_secctx(label->label, label->len);
 130 }
 131 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 132 {
 133         if (label)
 134                 return server->attr_bitmask;
 135
 136         return server->attr_bitmask_nl;
 137 }
 138 #else
 139 static inline struct nfs4_label *
 140 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 141         struct iattr *sattr, struct nfs4_label *l)
 142 { return NULL; }
 143 static inline void
 144 nfs4_label_release_security(struct nfs4_label *label)
 145 { return; }
 146 static inline u32 *
 147 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 148 { return server->attr_bitmask; }
 149 #endif
 150
 151 /* Prevent leaks of NFSv4 errors into userland */
 152 static int nfs4_map_errors(int err)
 153 {
 154         if (err >= -1000)
 155                 return err;
 156         switch (err) {
 157         case -NFS4ERR_RESOURCE:
 158         case -NFS4ERR_LAYOUTTRYLATER:
 159         case -NFS4ERR_RECALLCONFLICT:
 160                 return -EREMOTEIO;
 161         case -NFS4ERR_WRONGSEC:
 162         case -NFS4ERR_WRONG_CRED:
 163                 return -EPERM;
 164         case -NFS4ERR_BADOWNER:
 165         case -NFS4ERR_BADNAME:
 166                 return -EINVAL;
 167         case -NFS4ERR_SHARE_DENIED:
 168                 return -EACCES;
 169         case -NFS4ERR_MINOR_VERS_MISMATCH:
 170                 return -EPROTONOSUPPORT;
 171         case -NFS4ERR_FILE_OPEN:
 172                 return -EBUSY;
 173         default:
 174                 dprintk("%s could not handle NFSv4 error %d\n",
 175                                 __func__, -err);
 176                 break;
 177         }
 178         return -EIO;
 179 }
 180
 181 /*
 182  * This is our standard bitmap for GETATTR requests.
 183  */
 184 const u32 nfs4_fattr_bitmap[3] = {
 185         FATTR4_WORD0_TYPE
 186         | FATTR4_WORD0_CHANGE
 187         | FATTR4_WORD0_SIZE
 188         | FATTR4_WORD0_FSID
 189         | FATTR4_WORD0_FILEID,
 190         FATTR4_WORD1_MODE
 191         | FATTR4_WORD1_NUMLINKS
 192         | FATTR4_WORD1_OWNER
 193         | FATTR4_WORD1_OWNER_GROUP
 194         | FATTR4_WORD1_RAWDEV
 195         | FATTR4_WORD1_SPACE_USED
 196         | FATTR4_WORD1_TIME_ACCESS
 197         | FATTR4_WORD1_TIME_METADATA
 198         | FATTR4_WORD1_TIME_MODIFY
 199         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 200 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 201         FATTR4_WORD2_SECURITY_LABEL
 202 #endif
 203 };
 204
 205 static const u32 nfs4_pnfs_open_bitmap[3] = {
 206         FATTR4_WORD0_TYPE
 207         | FATTR4_WORD0_CHANGE
 208         | FATTR4_WORD0_SIZE
 209         | FATTR4_WORD0_FSID
 210         | FATTR4_WORD0_FILEID,
 211         FATTR4_WORD1_MODE
 212         | FATTR4_WORD1_NUMLINKS
 213         | FATTR4_WORD1_OWNER
 214         | FATTR4_WORD1_OWNER_GROUP
 215         | FATTR4_WORD1_RAWDEV
 216         | FATTR4_WORD1_SPACE_USED
 217         | FATTR4_WORD1_TIME_ACCESS
 218         | FATTR4_WORD1_TIME_METADATA
 219         | FATTR4_WORD1_TIME_MODIFY,
 220         FATTR4_WORD2_MDSTHRESHOLD
 221 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 222         | FATTR4_WORD2_SECURITY_LABEL
 223 #endif
 224 };
 225
 226 static const u32 nfs4_open_noattr_bitmap[3] = {
 227         FATTR4_WORD0_TYPE
 228         | FATTR4_WORD0_FILEID,
 229 };
 230
 231 const u32 nfs4_statfs_bitmap[3] = {
 232         FATTR4_WORD0_FILES_AVAIL
 233         | FATTR4_WORD0_FILES_FREE
 234         | FATTR4_WORD0_FILES_TOTAL,
 235         FATTR4_WORD1_SPACE_AVAIL
 236         | FATTR4_WORD1_SPACE_FREE
 237         | FATTR4_WORD1_SPACE_TOTAL
 238 };
 239
 240 const u32 nfs4_pathconf_bitmap[3] = {
 241         FATTR4_WORD0_MAXLINK
 242         | FATTR4_WORD0_MAXNAME,
 243         0
 244 };
 245
 246 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 247                         | FATTR4_WORD0_MAXREAD
 248                         | FATTR4_WORD0_MAXWRITE
 249                         | FATTR4_WORD0_LEASE_TIME,
 250                         FATTR4_WORD1_TIME_DELTA
 251                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 252                         FATTR4_WORD2_LAYOUT_BLKSIZE
 253                         | FATTR4_WORD2_CLONE_BLKSIZE
 254 };
 255
 256 const u32 nfs4_fs_locations_bitmap[3] = {
 257         FATTR4_WORD0_TYPE
 258         | FATTR4_WORD0_CHANGE
 259         | FATTR4_WORD0_SIZE
 260         | FATTR4_WORD0_FSID
 261         | FATTR4_WORD0_FILEID
 262         | FATTR4_WORD0_FS_LOCATIONS,
 263         FATTR4_WORD1_MODE
 264         | FATTR4_WORD1_NUMLINKS
 265         | FATTR4_WORD1_OWNER
 266         | FATTR4_WORD1_OWNER_GROUP
 267         | FATTR4_WORD1_RAWDEV
 268         | FATTR4_WORD1_SPACE_USED
 269         | FATTR4_WORD1_TIME_ACCESS
 270         | FATTR4_WORD1_TIME_METADATA
 271         | FATTR4_WORD1_TIME_MODIFY
 272         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 273 };
 274
 275 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 276                 struct nfs4_readdir_arg *readdir)
 277 {
 278         __be32 *start, *p;
 279
 280         if (cookie > 2) {
 281                 readdir->cookie = cookie;
 282                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 283                 return;
 284         }
 285
 286         readdir->cookie = 0;
 287         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 288         if (cookie == 2)
 289                 return;
 290
 291         /*
 292          * NFSv4 servers do not return entries for '.' and '..'
 293          * Therefore, we fake these entries here.  We let '.'
 294          * have cookie 0 and '..' have cookie 1.  Note that
 295          * when talking to the server, we always send cookie 0
 296          * instead of 1 or 2.
 297          */
 298         start = p = kmap_atomic(*readdir->pages);
 299
 300         if (cookie == 0) {
 301                 *p++ = xdr_one;                                  /* next */
 302                 *p++ = xdr_zero;                   /* cookie, first word */
 303                 *p++ = xdr_one;                   /* cookie, second word */
 304                 *p++ = xdr_one;                             /* entry len */
 305                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 306                 p++;
 307                 *p++ = xdr_one;                         /* bitmap length */
 308                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309                 *p++ = htonl(8);              /* attribute buffer length */
 310                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 311         }
 312
 313         *p++ = xdr_one;                                  /* next */
 314         *p++ = xdr_zero;                   /* cookie, first word */
 315         *p++ = xdr_two;                   /* cookie, second word */
 316         *p++ = xdr_two;                             /* entry len */
 317         memcpy(p, "..\0\0", 4);                         /* entry */
 318         p++;
 319         *p++ = xdr_one;                         /* bitmap length */
 320         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 321         *p++ = htonl(8);              /* attribute buffer length */
 322         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 323
 324         readdir->pgbase = (char *)p - (char *)start;
 325         readdir->count -= readdir->pgbase;
 326         kunmap_atomic(start);
 327 }
 328
 329 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 330                 nfs4_stateid *stateid,
 331                 struct rpc_cred *cred)
 332 {
 333         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 334
 335         ops->test_and_free_expired(server, stateid, cred);
 336 }
 337
 338 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 339                 nfs4_stateid *stateid,
 340                 struct rpc_cred *cred)
 341 {
 342         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 343         nfs4_test_and_free_stateid(server, stateid, cred);
 344 }
 345
 346 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 347                 const nfs4_stateid *stateid,
 348                 struct rpc_cred *cred)
 349 {
 350         nfs4_stateid tmp;
 351
 352         nfs4_stateid_copy(&tmp, stateid);
 353         __nfs4_free_revoked_stateid(server, &tmp, cred);
 354 }
 355
 356 static long nfs4_update_delay(long *timeout)
 357 {
 358         long ret;
 359         if (!timeout)
 360                 return NFS4_POLL_RETRY_MAX;
 361         if (*timeout <= 0)
 362                 *timeout = NFS4_POLL_RETRY_MIN;
 363         if (*timeout > NFS4_POLL_RETRY_MAX)
 364                 *timeout = NFS4_POLL_RETRY_MAX;
 365         ret = *timeout;
 366         *timeout <<= 1;
 367         return ret;
 368 }
 369
 370 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 371 {
 372         int res = 0;
 373
 374         might_sleep();
 375
 376         freezable_schedule_timeout_killable_unsafe(
 377                 nfs4_update_delay(timeout));
 378         if (fatal_signal_pending(current))
 379                 res = -ERESTARTSYS;
 380         return res;
 381 }
 382
 383 /* This is the error handling routine for processes that are allowed
 384  * to sleep.
 385  */
 386 static int nfs4_do_handle_exception(struct nfs_server *server,
 387                 int errorcode, struct nfs4_exception *exception)
 388 {
 389         struct nfs_client *clp = server->nfs_client;
 390         struct nfs4_state *state = exception->state;
 391         const nfs4_stateid *stateid = exception->stateid;
 392         struct inode *inode = exception->inode;
 393         int ret = errorcode;
 394
 395         exception->delay = 0;
 396         exception->recovering = 0;
 397         exception->retry = 0;
 398
 399         if (stateid == NULL && state != NULL)
 400                 stateid = &state->stateid;
 401
 402         switch(errorcode) {
 403                 case 0:
 404                         return 0;
 405                 case -NFS4ERR_DELEG_REVOKED:
 406                 case -NFS4ERR_ADMIN_REVOKED:
 407                 case -NFS4ERR_EXPIRED:
 408                 case -NFS4ERR_BAD_STATEID:
 409                         if (inode != NULL && stateid != NULL) {
 410                                 nfs_inode_find_state_and_recover(inode,
 411                                                 stateid);
 412                                 goto wait_on_recovery;
 413                         }
 414                 case -NFS4ERR_OPENMODE:
 415                         if (inode) {
 416                                 int err;
 417
 418                                 err = nfs_async_inode_return_delegation(inode,
 419                                                 stateid);
 420                                 if (err == 0)
 421                                         goto wait_on_recovery;
 422                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 423                                         exception->retry = 1;
 424                                         break;
 425                                 }
 426                         }
 427                         if (state == NULL)
 428                                 break;
 429                         ret = nfs4_schedule_stateid_recovery(server, state);
 430                         if (ret < 0)
 431                                 break;
 432                         goto wait_on_recovery;
 433                 case -NFS4ERR_STALE_STATEID:
 434                 case -NFS4ERR_STALE_CLIENTID:
 435                         nfs4_schedule_lease_recovery(clp);
 436                         goto wait_on_recovery;
 437                 case -NFS4ERR_MOVED:
 438                         ret = nfs4_schedule_migration_recovery(server);
 439                         if (ret < 0)
 440                                 break;
 441                         goto wait_on_recovery;
 442                 case -NFS4ERR_LEASE_MOVED:
 443                         nfs4_schedule_lease_moved_recovery(clp);
 444                         goto wait_on_recovery;
 445 #if defined(CONFIG_NFS_V4_1)
 446                 case -NFS4ERR_BADSESSION:
 447                 case -NFS4ERR_BADSLOT:
 448                 case -NFS4ERR_BAD_HIGH_SLOT:
 449                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 450                 case -NFS4ERR_DEADSESSION:
 451                 case -NFS4ERR_SEQ_FALSE_RETRY:
 452                 case -NFS4ERR_SEQ_MISORDERED:
 453                         dprintk("%s ERROR: %d Reset session\n", __func__,
 454                                 errorcode);
 455                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 456                         goto wait_on_recovery;
 457 #endif /* defined(CONFIG_NFS_V4_1) */
 458                 case -NFS4ERR_FILE_OPEN:
 459                         if (exception->timeout > HZ) {
 460                                 /* We have retried a decent amount, time to
 461                                  * fail
 462                                  */
 463                                 ret = -EBUSY;
 464                                 break;
 465                         }
 466                 case -NFS4ERR_DELAY:
 467                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 468                 case -NFS4ERR_GRACE:
 469                 case -NFS4ERR_LAYOUTTRYLATER:
 470                 case -NFS4ERR_RECALLCONFLICT:
 471                         exception->delay = 1;
 472                         return 0;
 473
 474                 case -NFS4ERR_RETRY_UNCACHED_REP:
 475                 case -NFS4ERR_OLD_STATEID:
 476                         exception->retry = 1;
 477                         break;
 478                 case -NFS4ERR_BADOWNER:
 479                         /* The following works around a Linux server bug! */
 480                 case -NFS4ERR_BADNAME:
 481                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 482                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 483                                 exception->retry = 1;
 484                                 printk(KERN_WARNING "NFS: v4 server %s "
 485                                                 "does not accept raw "
 486                                                 "uid/gids. "
 487                                                 "Reenabling the idmapper.\n",
 488                                                 server->nfs_client->cl_hostname);
 489                         }
 490         }
 491         /* We failed to handle the error */
 492         return nfs4_map_errors(ret);
 493 wait_on_recovery:
 494         exception->recovering = 1;
 495         return 0;
 496 }
 497
 498 /* This is the error handling routine for processes that are allowed
 499  * to sleep.
 500  */
 501 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 502 {
 503         struct nfs_client *clp = server->nfs_client;
 504         int ret;
 505
 506         ret = nfs4_do_handle_exception(server, errorcode, exception);
 507         if (exception->delay) {
 508                 ret = nfs4_delay(server->client, &exception->timeout);
 509                 goto out_retry;
 510         }
 511         if (exception->recovering) {
 512                 ret = nfs4_wait_clnt_recover(clp);
 513                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 514                         return -EIO;
 515                 goto out_retry;
 516         }
 517         return ret;
 518 out_retry:
 519         if (ret == 0)
 520                 exception->retry = 1;
 521         return ret;
 522 }
 523
 524 static int
 525 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 526                 int errorcode, struct nfs4_exception *exception)
 527 {
 528         struct nfs_client *clp = server->nfs_client;
 529         int ret;
 530
 531         ret = nfs4_do_handle_exception(server, errorcode, exception);
 532         if (exception->delay) {
 533                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 534                 goto out_retry;
 535         }
 536         if (exception->recovering) {
 537                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 538                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 539                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 540                 goto out_retry;
 541         }
 542         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 543                 ret = -EIO;
 544         return ret;
 545 out_retry:
 546         if (ret == 0)
 547                 exception->retry = 1;
 548         return ret;
 549 }
 550
 551 static int
 552 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 553                         struct nfs4_state *state, long *timeout)
 554 {
 555         struct nfs4_exception exception = {
 556                 .state = state,
 557         };
 558
 559         if (task->tk_status >= 0)
 560                 return 0;
 561         if (timeout)
 562                 exception.timeout = *timeout;
 563         task->tk_status = nfs4_async_handle_exception(task, server,
 564                         task->tk_status,
 565                         &exception);
 566         if (exception.delay && timeout)
 567                 *timeout = exception.timeout;
 568         if (exception.retry)
 569                 return -EAGAIN;
 570         return 0;
 571 }
 572
 573 /*
 574  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 575  * or 'false' otherwise.
 576  */
 577 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 578 {
 579         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 580
 581         if (flavor == RPC_AUTH_GSS_KRB5I ||
 582             flavor == RPC_AUTH_GSS_KRB5P)
 583                 return true;
 584
 585         return false;
 586 }
 587
 588 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 589 {
 590         spin_lock(&clp->cl_lock);
 591         if (time_before(clp->cl_last_renewal,timestamp))
 592                 clp->cl_last_renewal = timestamp;
 593         spin_unlock(&clp->cl_lock);
 594 }
 595
 596 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 597 {
 598         struct nfs_client *clp = server->nfs_client;
 599
 600         if (!nfs4_has_session(clp))
 601                 do_renew_lease(clp, timestamp);
 602 }
 603
 604 struct nfs4_call_sync_data {
 605         const struct nfs_server *seq_server;
 606         struct nfs4_sequence_args *seq_args;
 607         struct nfs4_sequence_res *seq_res;
 608 };
 609
 610 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 611                         struct nfs4_sequence_res *res, int cache_reply)
 612 {
 613         args->sa_slot = NULL;
 614         args->sa_cache_this = cache_reply;
 615         args->sa_privileged = 0;
 616
 617         res->sr_slot = NULL;
 618 }
 619
 620 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 621 {
 622         args->sa_privileged = 1;
 623 }
 624
 625 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 626                          struct nfs4_sequence_args *args,
 627                          struct nfs4_sequence_res *res,
 628                          struct rpc_task *task)
 629 {
 630         struct nfs4_slot *slot;
 631
 632         /* slot already allocated? */
 633         if (res->sr_slot != NULL)
 634                 goto out_start;
 635
 636         spin_lock(&tbl->slot_tbl_lock);
 637         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 638                 goto out_sleep;
 639
 640         slot = nfs4_alloc_slot(tbl);
 641         if (IS_ERR(slot)) {
 642                 if (slot == ERR_PTR(-ENOMEM))
 643                         task->tk_timeout = HZ >> 2;
 644                 goto out_sleep;
 645         }
 646         spin_unlock(&tbl->slot_tbl_lock);
 647
 648         slot->privileged = args->sa_privileged ? 1 : 0;
 649         args->sa_slot = slot;
 650         res->sr_slot = slot;
 651
 652 out_start:
 653         rpc_call_start(task);
 654         return 0;
 655
 656 out_sleep:
 657         if (args->sa_privileged)
 658                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 659                                 NULL, RPC_PRIORITY_PRIVILEGED);
 660         else
 661                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 662         spin_unlock(&tbl->slot_tbl_lock);
 663         return -EAGAIN;
 664 }
 665 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 666
 667 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 668 {
 669         struct nfs4_slot *slot = res->sr_slot;
 670         struct nfs4_slot_table *tbl;
 671
 672         tbl = slot->table;
 673         spin_lock(&tbl->slot_tbl_lock);
 674         if (!nfs41_wake_and_assign_slot(tbl, slot))
 675                 nfs4_free_slot(tbl, slot);
 676         spin_unlock(&tbl->slot_tbl_lock);
 677
 678         res->sr_slot = NULL;
 679 }
 680
 681 static int nfs40_sequence_done(struct rpc_task *task,
 682                                struct nfs4_sequence_res *res)
 683 {
 684         if (res->sr_slot != NULL)
 685                 nfs40_sequence_free_slot(res);
 686         return 1;
 687 }
 688
 689 #if defined(CONFIG_NFS_V4_1)
 690
 691 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 692 {
 693         struct nfs4_session *session;
 694         struct nfs4_slot_table *tbl;
 695         struct nfs4_slot *slot = res->sr_slot;
 696         bool send_new_highest_used_slotid = false;
 697
 698         tbl = slot->table;
 699         session = tbl->session;
 700
 701         /* Bump the slot sequence number */
 702         if (slot->seq_done)
 703                 slot->seq_nr++;
 704         slot->seq_done = 0;
 705
 706         spin_lock(&tbl->slot_tbl_lock);
 707         /* Be nice to the server: try to ensure that the last transmitted
 708          * value for highest_user_slotid <= target_highest_slotid
 709          */
 710         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 711                 send_new_highest_used_slotid = true;
 712
 713         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 714                 send_new_highest_used_slotid = false;
 715                 goto out_unlock;
 716         }
 717         nfs4_free_slot(tbl, slot);
 718
 719         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 720                 send_new_highest_used_slotid = false;
 721 out_unlock:
 722         spin_unlock(&tbl->slot_tbl_lock);
 723         res->sr_slot = NULL;
 724         if (send_new_highest_used_slotid)
 725                 nfs41_notify_server(session->clp);
 726         if (waitqueue_active(&tbl->slot_waitq))
 727                 wake_up_all(&tbl->slot_waitq);
 728 }
 729
 730 static int nfs41_sequence_process(struct rpc_task *task,
 731                 struct nfs4_sequence_res *res)
 732 {
 733         struct nfs4_session *session;
 734         struct nfs4_slot *slot = res->sr_slot;
 735         struct nfs_client *clp;
 736         bool interrupted = false;
 737         int ret = 1;
 738
 739         if (slot == NULL)
 740                 goto out_noaction;
 741         /* don't increment the sequence number if the task wasn't sent */
 742         if (!RPC_WAS_SENT(task))
 743                 goto out;
 744
 745         session = slot->table->session;
 746
 747         if (slot->interrupted) {
 748                 slot->interrupted = 0;
 749                 interrupted = true;
 750         }
 751
 752         trace_nfs4_sequence_done(session, res);
 753         /* Check the SEQUENCE operation status */
 754         switch (res->sr_status) {
 755         case 0:
 756                 /* If previous op on slot was interrupted and we reused
 757                  * the seq# and got a reply from the cache, then retry
 758                  */
 759                 if (task->tk_status == -EREMOTEIO && interrupted) {
 760                         ++slot->seq_nr;
 761                         goto retry_nowait;
 762                 }
 763                 /* Update the slot's sequence and clientid lease timer */
 764                 slot->seq_done = 1;
 765                 clp = session->clp;
 766                 do_renew_lease(clp, res->sr_timestamp);
 767                 /* Check sequence flags */
 768                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 769                                 !!slot->privileged);
 770                 nfs41_update_target_slotid(slot->table, slot, res);
 771                 break;
 772         case 1:
 773                 /*
 774                  * sr_status remains 1 if an RPC level error occurred.
 775                  * The server may or may not have processed the sequence
 776                  * operation..
 777                  * Mark the slot as having hosted an interrupted RPC call.
 778                  */
 779                 slot->interrupted = 1;
 780                 goto out;
 781         case -NFS4ERR_DELAY:
 782                 /* The server detected a resend of the RPC call and
 783                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 784                  * of RFC5661.
 785                  */
 786                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 787                         __func__,
 788                         slot->slot_nr,
 789                         slot->seq_nr);
 790                 goto out_retry;
 791         case -NFS4ERR_BADSLOT:
 792                 /*
 793                  * The slot id we used was probably retired. Try again
 794                  * using a different slot id.
 795                  */
 796                 goto retry_nowait;
 797         case -NFS4ERR_SEQ_MISORDERED:
 798                 /*
 799                  * Was the last operation on this sequence interrupted?
 800                  * If so, retry after bumping the sequence number.
 801                  */
 802                 if (interrupted) {
 803                         ++slot->seq_nr;
 804                         goto retry_nowait;
 805                 }
 806                 /*
 807                  * Could this slot have been previously retired?
 808                  * If so, then the server may be expecting seq_nr = 1!
 809                  */
 810                 if (slot->seq_nr != 1) {
 811                         slot->seq_nr = 1;
 812                         goto retry_nowait;
 813                 }
 814                 break;
 815         case -NFS4ERR_SEQ_FALSE_RETRY:
 816                 ++slot->seq_nr;
 817                 goto retry_nowait;
 818         case -NFS4ERR_DEADSESSION:
 819         case -NFS4ERR_BADSESSION:
 820                 nfs4_schedule_session_recovery(session, res->sr_status);
 821                 goto retry_nowait;
 822         default:
 823                 /* Just update the slot sequence no. */
 824                 slot->seq_done = 1;
 825         }
 826 out:
 827         /* The session may be reset by one of the error handlers. */
 828         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 829 out_noaction:
 830         return ret;
 831 retry_nowait:
 832         if (rpc_restart_call_prepare(task)) {
 833                 nfs41_sequence_free_slot(res);
 834                 task->tk_status = 0;
 835                 ret = 0;
 836         }
 837         goto out;
 838 out_retry:
 839         if (!rpc_restart_call(task))
 840                 goto out;
 841         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 842         return 0;
 843 }
 844
 845 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 846 {
 847         if (!nfs41_sequence_process(task, res))
 848                 return 0;
 849         if (res->sr_slot != NULL)
 850                 nfs41_sequence_free_slot(res);
 851         return 1;
 852
 853 }
 854 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 855
 856 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 857 {
 858         if (res->sr_slot == NULL)
 859                 return 1;
 860         if (res->sr_slot->table->session != NULL)
 861                 return nfs41_sequence_process(task, res);
 862         return nfs40_sequence_done(task, res);
 863 }
 864
 865 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 866 {
 867         if (res->sr_slot != NULL) {
 868                 if (res->sr_slot->table->session != NULL)
 869                         nfs41_sequence_free_slot(res);
 870                 else
 871                         nfs40_sequence_free_slot(res);
 872         }
 873 }
 874
 875 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 876 {
 877         if (res->sr_slot == NULL)
 878                 return 1;
 879         if (!res->sr_slot->table->session)
 880                 return nfs40_sequence_done(task, res);
 881         return nfs41_sequence_done(task, res);
 882 }
 883 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 884
 885 int nfs41_setup_sequence(struct nfs4_session *session,
 886                                 struct nfs4_sequence_args *args,
 887                                 struct nfs4_sequence_res *res,
 888                                 struct rpc_task *task)
 889 {
 890         struct nfs4_slot *slot;
 891         struct nfs4_slot_table *tbl;
 892
 893         dprintk("--> %s\n", __func__);
 894         /* slot already allocated? */
 895         if (res->sr_slot != NULL)
 896                 goto out_success;
 897
 898         tbl = &session->fc_slot_table;
 899
 900         task->tk_timeout = 0;
 901
 902         spin_lock(&tbl->slot_tbl_lock);
 903         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 904             !args->sa_privileged) {
 905                 /* The state manager will wait until the slot table is empty */
 906                 dprintk("%s session is draining\n", __func__);
 907                 goto out_sleep;
 908         }
 909
 910         slot = nfs4_alloc_slot(tbl);
 911         if (IS_ERR(slot)) {
 912                 /* If out of memory, try again in 1/4 second */
 913                 if (slot == ERR_PTR(-ENOMEM))
 914                         task->tk_timeout = HZ >> 2;
 915                 dprintk("<-- %s: no free slots\n", __func__);
 916                 goto out_sleep;
 917         }
 918         spin_unlock(&tbl->slot_tbl_lock);
 919
 920         slot->privileged = args->sa_privileged ? 1 : 0;
 921         args->sa_slot = slot;
 922
 923         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 924                         slot->slot_nr, slot->seq_nr);
 925
 926         res->sr_slot = slot;
 927         res->sr_timestamp = jiffies;
 928         res->sr_status_flags = 0;
 929         /*
 930          * sr_status is only set in decode_sequence, and so will remain
 931          * set to 1 if an rpc level failure occurs.
 932          */
 933         res->sr_status = 1;
 934         trace_nfs4_setup_sequence(session, args);
 935 out_success:
 936         rpc_call_start(task);
 937         return 0;
 938 out_sleep:
 939         /* Privileged tasks are queued with top priority */
 940         if (args->sa_privileged)
 941                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 942                                 NULL, RPC_PRIORITY_PRIVILEGED);
 943         else
 944                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 945         spin_unlock(&tbl->slot_tbl_lock);
 946         return -EAGAIN;
 947 }
 948 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 949
 950 static int nfs4_setup_sequence(const struct nfs_client *client,
 951                                struct nfs4_sequence_args *args,
 952                                struct nfs4_sequence_res *res,
 953                                struct rpc_task *task)
 954 {
 955         struct nfs4_session *session = nfs4_get_session(client);
 956         int ret = 0;
 957
 958         if (!session)
 959                 return nfs40_setup_sequence(client->cl_slot_tbl,
 960                                             args, res, task);
 961
 962         dprintk("--> %s clp %p session %p sr_slot %u\n",
 963                 __func__, session->clp, session, res->sr_slot ?
 964                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 965
 966         ret = nfs41_setup_sequence(session, args, res, task);
 967
 968         dprintk("<-- %s status=%d\n", __func__, ret);
 969         return ret;
 970 }
 971
 972 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 973 {
 974         struct nfs4_call_sync_data *data = calldata;
 975         struct nfs4_session *session = nfs4_get_session(data->seq_server->nfs_client);
 976
 977         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 978
 979         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 980 }
 981
 982 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 983 {
 984         struct nfs4_call_sync_data *data = calldata;
 985
 986         nfs41_sequence_done(task, data->seq_res);
 987 }
 988
 989 static const struct rpc_call_ops nfs41_call_sync_ops = {
 990         .rpc_call_prepare = nfs41_call_sync_prepare,
 991         .rpc_call_done = nfs41_call_sync_done,
 992 };
 993
 994 #else   /* !CONFIG_NFS_V4_1 */
 995
 996 static int nfs4_setup_sequence(const struct nfs_client *client,
 997                                struct nfs4_sequence_args *args,
 998                                struct nfs4_sequence_res *res,
 999                                struct rpc_task *task)
1000 {
1001         return nfs40_setup_sequence(client->cl_slot_tbl, args, res, task);
1002 }
1003
1004 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1005 {
1006         return nfs40_sequence_done(task, res);
1007 }
1008
1009 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1010 {
1011         if (res->sr_slot != NULL)
1012                 nfs40_sequence_free_slot(res);
1013 }
1014
1015 int nfs4_sequence_done(struct rpc_task *task,
1016                        struct nfs4_sequence_res *res)
1017 {
1018         return nfs40_sequence_done(task, res);
1019 }
1020 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1021
1022 #endif  /* !CONFIG_NFS_V4_1 */
1023
1024 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1025 {
1026         struct nfs4_call_sync_data *data = calldata;
1027         nfs4_setup_sequence(data->seq_server->nfs_client,
1028                                 data->seq_args, data->seq_res, task);
1029 }
1030
1031 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1032 {
1033         struct nfs4_call_sync_data *data = calldata;
1034         nfs4_sequence_done(task, data->seq_res);
1035 }
1036
1037 static const struct rpc_call_ops nfs40_call_sync_ops = {
1038         .rpc_call_prepare = nfs40_call_sync_prepare,
1039         .rpc_call_done = nfs40_call_sync_done,
1040 };
1041
1042 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1043                                    struct nfs_server *server,
1044                                    struct rpc_message *msg,
1045                                    struct nfs4_sequence_args *args,
1046                                    struct nfs4_sequence_res *res)
1047 {
1048         int ret;
1049         struct rpc_task *task;
1050         struct nfs_client *clp = server->nfs_client;
1051         struct nfs4_call_sync_data data = {
1052                 .seq_server = server,
1053                 .seq_args = args,
1054                 .seq_res = res,
1055         };
1056         struct rpc_task_setup task_setup = {
1057                 .rpc_client = clnt,
1058                 .rpc_message = msg,
1059                 .callback_ops = clp->cl_mvops->call_sync_ops,
1060                 .callback_data = &data
1061         };
1062
1063         task = rpc_run_task(&task_setup);
1064         if (IS_ERR(task))
1065                 ret = PTR_ERR(task);
1066         else {
1067                 ret = task->tk_status;
1068                 rpc_put_task(task);
1069         }
1070         return ret;
1071 }
1072
1073 int nfs4_call_sync(struct rpc_clnt *clnt,
1074                    struct nfs_server *server,
1075                    struct rpc_message *msg,
1076                    struct nfs4_sequence_args *args,
1077                    struct nfs4_sequence_res *res,
1078                    int cache_reply)
1079 {
1080         nfs4_init_sequence(args, res, cache_reply);
1081         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1082 }
1083
1084 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1085                 unsigned long timestamp)
1086 {
1087         struct nfs_inode *nfsi = NFS_I(dir);
1088
1089         spin_lock(&dir->i_lock);
1090         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1091         if (cinfo->atomic && cinfo->before == dir->i_version) {
1092                 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1093                 nfsi->attrtimeo_timestamp = jiffies;
1094         } else {
1095                 nfs_force_lookup_revalidate(dir);
1096                 if (cinfo->before != dir->i_version)
1097                         nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
1098                                 NFS_INO_INVALID_ACL;
1099         }
1100         dir->i_version = cinfo->after;
1101         nfsi->read_cache_jiffies = timestamp;
1102         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1103         nfs_fscache_invalidate(dir);
1104         spin_unlock(&dir->i_lock);
1105 }
1106
1107 struct nfs4_opendata {
1108         struct kref kref;
1109         struct nfs_openargs o_arg;
1110         struct nfs_openres o_res;
1111         struct nfs_open_confirmargs c_arg;
1112         struct nfs_open_confirmres c_res;
1113         struct nfs4_string owner_name;
1114         struct nfs4_string group_name;
1115         struct nfs4_label *a_label;
1116         struct nfs_fattr f_attr;
1117         struct nfs4_label *f_label;
1118         struct dentry *dir;
1119         struct dentry *dentry;
1120         struct nfs4_state_owner *owner;
1121         struct nfs4_state *state;
1122         struct iattr attrs;
1123         unsigned long timestamp;
1124         unsigned int rpc_done : 1;
1125         unsigned int file_created : 1;
1126         unsigned int is_recover : 1;
1127         int rpc_status;
1128         int cancelled;
1129 };
1130
1131 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1132                 int err, struct nfs4_exception *exception)
1133 {
1134         if (err != -EINVAL)
1135                 return false;
1136         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1137                 return false;
1138         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1139         exception->retry = 1;
1140         return true;
1141 }
1142
1143 static u32
1144 nfs4_map_atomic_open_share(struct nfs_server *server,
1145                 fmode_t fmode, int openflags)
1146 {
1147         u32 res = 0;
1148
1149         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1150         case FMODE_READ:
1151                 res = NFS4_SHARE_ACCESS_READ;
1152                 break;
1153         case FMODE_WRITE:
1154                 res = NFS4_SHARE_ACCESS_WRITE;
1155                 break;
1156         case FMODE_READ|FMODE_WRITE:
1157                 res = NFS4_SHARE_ACCESS_BOTH;
1158         }
1159         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1160                 goto out;
1161         /* Want no delegation if we're using O_DIRECT */
1162         if (openflags & O_DIRECT)
1163                 res |= NFS4_SHARE_WANT_NO_DELEG;
1164 out:
1165         return res;
1166 }
1167
1168 static enum open_claim_type4
1169 nfs4_map_atomic_open_claim(struct nfs_server *server,
1170                 enum open_claim_type4 claim)
1171 {
1172         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1173                 return claim;
1174         switch (claim) {
1175         default:
1176                 return claim;
1177         case NFS4_OPEN_CLAIM_FH:
1178                 return NFS4_OPEN_CLAIM_NULL;
1179         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1180                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1181         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1182                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1183         }
1184 }
1185
1186 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1187 {
1188         p->o_res.f_attr = &p->f_attr;
1189         p->o_res.f_label = p->f_label;
1190         p->o_res.seqid = p->o_arg.seqid;
1191         p->c_res.seqid = p->c_arg.seqid;
1192         p->o_res.server = p->o_arg.server;
1193         p->o_res.access_request = p->o_arg.access;
1194         nfs_fattr_init(&p->f_attr);
1195         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1196 }
1197
1198 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1199                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1200                 const struct iattr *attrs,
1201                 struct nfs4_label *label,
1202                 enum open_claim_type4 claim,
1203                 gfp_t gfp_mask)
1204 {
1205         struct dentry *parent = dget_parent(dentry);
1206         struct inode *dir = d_inode(parent);
1207         struct nfs_server *server = NFS_SERVER(dir);
1208         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1209         struct nfs4_opendata *p;
1210
1211         p = kzalloc(sizeof(*p), gfp_mask);
1212         if (p == NULL)
1213                 goto err;
1214
1215         p->f_label = nfs4_label_alloc(server, gfp_mask);
1216         if (IS_ERR(p->f_label))
1217                 goto err_free_p;
1218
1219         p->a_label = nfs4_label_alloc(server, gfp_mask);
1220         if (IS_ERR(p->a_label))
1221                 goto err_free_f;
1222
1223         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1224         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1225         if (IS_ERR(p->o_arg.seqid))
1226                 goto err_free_label;
1227         nfs_sb_active(dentry->d_sb);
1228         p->dentry = dget(dentry);
1229         p->dir = parent;
1230         p->owner = sp;
1231         atomic_inc(&sp->so_count);
1232         p->o_arg.open_flags = flags;
1233         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1234         p->o_arg.umask = current_umask();
1235         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1236         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1237                         fmode, flags);
1238         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1239          * will return permission denied for all bits until close */
1240         if (!(flags & O_EXCL)) {
1241                 /* ask server to check for all possible rights as results
1242                  * are cached */
1243                 switch (p->o_arg.claim) {
1244                 default:
1245                         break;
1246                 case NFS4_OPEN_CLAIM_NULL:
1247                 case NFS4_OPEN_CLAIM_FH:
1248                         p->o_arg.access = NFS4_ACCESS_READ |
1249                                 NFS4_ACCESS_MODIFY |
1250                                 NFS4_ACCESS_EXTEND |
1251                                 NFS4_ACCESS_EXECUTE;
1252                 }
1253         }
1254         p->o_arg.clientid = server->nfs_client->cl_clientid;
1255         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1256         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1257         p->o_arg.name = &dentry->d_name;
1258         p->o_arg.server = server;
1259         p->o_arg.bitmask = nfs4_bitmask(server, label);
1260         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1261         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1262         switch (p->o_arg.claim) {
1263         case NFS4_OPEN_CLAIM_NULL:
1264         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1265         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1266                 p->o_arg.fh = NFS_FH(dir);
1267                 break;
1268         case NFS4_OPEN_CLAIM_PREVIOUS:
1269         case NFS4_OPEN_CLAIM_FH:
1270         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1271         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1272                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1273         }
1274         if (attrs != NULL && attrs->ia_valid != 0) {
1275                 __u32 verf[2];
1276
1277                 p->o_arg.u.attrs = &p->attrs;
1278                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1279
1280                 verf[0] = jiffies;
1281                 verf[1] = current->pid;
1282                 memcpy(p->o_arg.u.verifier.data, verf,
1283                                 sizeof(p->o_arg.u.verifier.data));
1284         }
1285         p->c_arg.fh = &p->o_res.fh;
1286         p->c_arg.stateid = &p->o_res.stateid;
1287         p->c_arg.seqid = p->o_arg.seqid;
1288         nfs4_init_opendata_res(p);
1289         kref_init(&p->kref);
1290         return p;
1291
1292 err_free_label:
1293         nfs4_label_free(p->a_label);
1294 err_free_f:
1295         nfs4_label_free(p->f_label);
1296 err_free_p:
1297         kfree(p);
1298 err:
1299         dput(parent);
1300         return NULL;
1301 }
1302
1303 static void nfs4_opendata_free(struct kref *kref)
1304 {
1305         struct nfs4_opendata *p = container_of(kref,
1306                         struct nfs4_opendata, kref);
1307         struct super_block *sb = p->dentry->d_sb;
1308
1309         nfs_free_seqid(p->o_arg.seqid);
1310         nfs4_sequence_free_slot(&p->o_res.seq_res);
1311         if (p->state != NULL)
1312                 nfs4_put_open_state(p->state);
1313         nfs4_put_state_owner(p->owner);
1314
1315         nfs4_label_free(p->a_label);
1316         nfs4_label_free(p->f_label);
1317
1318         dput(p->dir);
1319         dput(p->dentry);
1320         nfs_sb_deactive(sb);
1321         nfs_fattr_free_names(&p->f_attr);
1322         kfree(p->f_attr.mdsthreshold);
1323         kfree(p);
1324 }
1325
1326 static void nfs4_opendata_put(struct nfs4_opendata *p)
1327 {
1328         if (p != NULL)
1329                 kref_put(&p->kref, nfs4_opendata_free);
1330 }
1331
1332 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1333 {
1334         int ret;
1335
1336         ret = rpc_wait_for_completion_task(task);
1337         return ret;
1338 }
1339
1340 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1341                 fmode_t fmode)
1342 {
1343         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1344         case FMODE_READ|FMODE_WRITE:
1345                 return state->n_rdwr != 0;
1346         case FMODE_WRITE:
1347                 return state->n_wronly != 0;
1348         case FMODE_READ:
1349                 return state->n_rdonly != 0;
1350         }
1351         WARN_ON_ONCE(1);
1352         return false;
1353 }
1354
1355 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1356 {
1357         int ret = 0;
1358
1359         if (open_mode & (O_EXCL|O_TRUNC))
1360                 goto out;
1361         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1362                 case FMODE_READ:
1363                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1364                                 && state->n_rdonly != 0;
1365                         break;
1366                 case FMODE_WRITE:
1367                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1368                                 && state->n_wronly != 0;
1369                         break;
1370                 case FMODE_READ|FMODE_WRITE:
1371                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1372                                 && state->n_rdwr != 0;
1373         }
1374 out:
1375         return ret;
1376 }
1377
1378 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1379                 enum open_claim_type4 claim)
1380 {
1381         if (delegation == NULL)
1382                 return 0;
1383         if ((delegation->type & fmode) != fmode)
1384                 return 0;
1385         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1386                 return 0;
1387         switch (claim) {
1388         case NFS4_OPEN_CLAIM_NULL:
1389         case NFS4_OPEN_CLAIM_FH:
1390                 break;
1391         case NFS4_OPEN_CLAIM_PREVIOUS:
1392                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1393                         break;
1394         default:
1395                 return 0;
1396         }
1397         nfs_mark_delegation_referenced(delegation);
1398         return 1;
1399 }
1400
1401 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1402 {
1403         switch (fmode) {
1404                 case FMODE_WRITE:
1405                         state->n_wronly++;
1406                         break;
1407                 case FMODE_READ:
1408                         state->n_rdonly++;
1409                         break;
1410                 case FMODE_READ|FMODE_WRITE:
1411                         state->n_rdwr++;
1412         }
1413         nfs4_state_set_mode_locked(state, state->state | fmode);
1414 }
1415
1416 #ifdef CONFIG_NFS_V4_1
1417 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1418 {
1419         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1420                 return true;
1421         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1422                 return true;
1423         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1424                 return true;
1425         return false;
1426 }
1427 #endif /* CONFIG_NFS_V4_1 */
1428
1429 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1430 {
1431         struct nfs_client *clp = state->owner->so_server->nfs_client;
1432         bool need_recover = false;
1433
1434         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1435                 need_recover = true;
1436         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1437                 need_recover = true;
1438         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1439                 need_recover = true;
1440         if (need_recover)
1441                 nfs4_state_mark_reclaim_nograce(clp, state);
1442 }
1443
1444 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1445                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1446 {
1447         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1448                 return true;
1449         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1450                 nfs4_stateid_copy(freeme, &state->open_stateid);
1451                 nfs_test_and_clear_all_open_stateid(state);
1452                 return true;
1453         }
1454         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1455                 return true;
1456         return false;
1457 }
1458
1459 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1460 {
1461         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1462                 return;
1463         if (state->n_wronly)
1464                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1465         if (state->n_rdonly)
1466                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1467         if (state->n_rdwr)
1468                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1469         set_bit(NFS_OPEN_STATE, &state->flags);
1470 }
1471
1472 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1473                 nfs4_stateid *stateid, fmode_t fmode)
1474 {
1475         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1476         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1477         case FMODE_WRITE:
1478                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1479                 break;
1480         case FMODE_READ:
1481                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1482                 break;
1483         case 0:
1484                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1485                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1486                 clear_bit(NFS_OPEN_STATE, &state->flags);
1487         }
1488         if (stateid == NULL)
1489                 return;
1490         /* Handle OPEN+OPEN_DOWNGRADE races */
1491         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1492             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1493                 nfs_resync_open_stateid_locked(state);
1494                 return;
1495         }
1496         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1497                 nfs4_stateid_copy(&state->stateid, stateid);
1498         nfs4_stateid_copy(&state->open_stateid, stateid);
1499 }
1500
1501 static void nfs_clear_open_stateid(struct nfs4_state *state,
1502         nfs4_stateid *arg_stateid,
1503         nfs4_stateid *stateid, fmode_t fmode)
1504 {
1505         write_seqlock(&state->seqlock);
1506         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1507         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1508                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1509         write_sequnlock(&state->seqlock);
1510         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1511                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1512 }
1513
1514 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1515                 const nfs4_stateid *stateid, fmode_t fmode,
1516                 nfs4_stateid *freeme)
1517 {
1518         switch (fmode) {
1519                 case FMODE_READ:
1520                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1521                         break;
1522                 case FMODE_WRITE:
1523                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1524                         break;
1525                 case FMODE_READ|FMODE_WRITE:
1526                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1527         }
1528         if (!nfs_need_update_open_stateid(state, stateid, freeme))
1529                 return;
1530         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1531                 nfs4_stateid_copy(&state->stateid, stateid);
1532         nfs4_stateid_copy(&state->open_stateid, stateid);
1533 }
1534
1535 static void __update_open_stateid(struct nfs4_state *state,
1536                 const nfs4_stateid *open_stateid,
1537                 const nfs4_stateid *deleg_stateid,
1538                 fmode_t fmode,
1539                 nfs4_stateid *freeme)
1540 {
1541         /*
1542          * Protect the call to nfs4_state_set_mode_locked and
1543          * serialise the stateid update
1544          */
1545         spin_lock(&state->owner->so_lock);
1546         write_seqlock(&state->seqlock);
1547         if (deleg_stateid != NULL) {
1548                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1549                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1550         }
1551         if (open_stateid != NULL)
1552                 nfs_set_open_stateid_locked(state, open_stateid, fmode, freeme);
1553         write_sequnlock(&state->seqlock);
1554         update_open_stateflags(state, fmode);
1555         spin_unlock(&state->owner->so_lock);
1556 }
1557
1558 static int update_open_stateid(struct nfs4_state *state,
1559                 const nfs4_stateid *open_stateid,
1560                 const nfs4_stateid *delegation,
1561                 fmode_t fmode)
1562 {
1563         struct nfs_server *server = NFS_SERVER(state->inode);
1564         struct nfs_client *clp = server->nfs_client;
1565         struct nfs_inode *nfsi = NFS_I(state->inode);
1566         struct nfs_delegation *deleg_cur;
1567         nfs4_stateid freeme = { };
1568         int ret = 0;
1569
1570         fmode &= (FMODE_READ|FMODE_WRITE);
1571
1572         rcu_read_lock();
1573         deleg_cur = rcu_dereference(nfsi->delegation);
1574         if (deleg_cur == NULL)
1575                 goto no_delegation;
1576
1577         spin_lock(&deleg_cur->lock);
1578         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1579            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1580             (deleg_cur->type & fmode) != fmode)
1581                 goto no_delegation_unlock;
1582
1583         if (delegation == NULL)
1584                 delegation = &deleg_cur->stateid;
1585         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1586                 goto no_delegation_unlock;
1587
1588         nfs_mark_delegation_referenced(deleg_cur);
1589         __update_open_stateid(state, open_stateid, &deleg_cur->stateid,
1590                         fmode, &freeme);
1591         ret = 1;
1592 no_delegation_unlock:
1593         spin_unlock(&deleg_cur->lock);
1594 no_delegation:
1595         rcu_read_unlock();
1596
1597         if (!ret && open_stateid != NULL) {
1598                 __update_open_stateid(state, open_stateid, NULL, fmode, &freeme);
1599                 ret = 1;
1600         }
1601         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1602                 nfs4_schedule_state_manager(clp);
1603         if (freeme.type != 0)
1604                 nfs4_test_and_free_stateid(server, &freeme,
1605                                 state->owner->so_cred);
1606
1607         return ret;
1608 }
1609
1610 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1611                 const nfs4_stateid *stateid)
1612 {
1613         struct nfs4_state *state = lsp->ls_state;
1614         bool ret = false;
1615
1616         spin_lock(&state->state_lock);
1617         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1618                 goto out_noupdate;
1619         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1620                 goto out_noupdate;
1621         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1622         ret = true;
1623 out_noupdate:
1624         spin_unlock(&state->state_lock);
1625         return ret;
1626 }
1627
1628 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1629 {
1630         struct nfs_delegation *delegation;
1631
1632         rcu_read_lock();
1633         delegation = rcu_dereference(NFS_I(inode)->delegation);
1634         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1635                 rcu_read_unlock();
1636                 return;
1637         }
1638         rcu_read_unlock();
1639         nfs4_inode_return_delegation(inode);
1640 }
1641
1642 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1643 {
1644         struct nfs4_state *state = opendata->state;
1645         struct nfs_inode *nfsi = NFS_I(state->inode);
1646         struct nfs_delegation *delegation;
1647         int open_mode = opendata->o_arg.open_flags;
1648         fmode_t fmode = opendata->o_arg.fmode;
1649         enum open_claim_type4 claim = opendata->o_arg.claim;
1650         nfs4_stateid stateid;
1651         int ret = -EAGAIN;
1652
1653         for (;;) {
1654                 spin_lock(&state->owner->so_lock);
1655                 if (can_open_cached(state, fmode, open_mode)) {
1656                         update_open_stateflags(state, fmode);
1657                         spin_unlock(&state->owner->so_lock);
1658                         goto out_return_state;
1659                 }
1660                 spin_unlock(&state->owner->so_lock);
1661                 rcu_read_lock();
1662                 delegation = rcu_dereference(nfsi->delegation);
1663                 if (!can_open_delegated(delegation, fmode, claim)) {
1664                         rcu_read_unlock();
1665                         break;
1666                 }
1667                 /* Save the delegation */
1668                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1669                 rcu_read_unlock();
1670                 nfs_release_seqid(opendata->o_arg.seqid);
1671                 if (!opendata->is_recover) {
1672                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1673                         if (ret != 0)
1674                                 goto out;
1675                 }
1676                 ret = -EAGAIN;
1677
1678                 /* Try to update the stateid using the delegation */
1679                 if (update_open_stateid(state, NULL, &stateid, fmode))
1680                         goto out_return_state;
1681         }
1682 out:
1683         return ERR_PTR(ret);
1684 out_return_state:
1685         atomic_inc(&state->count);
1686         return state;
1687 }
1688
1689 static void
1690 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1691 {
1692         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1693         struct nfs_delegation *delegation;
1694         int delegation_flags = 0;
1695
1696         rcu_read_lock();
1697         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1698         if (delegation)
1699                 delegation_flags = delegation->flags;
1700         rcu_read_unlock();
1701         switch (data->o_arg.claim) {
1702         default:
1703                 break;
1704         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1705         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1706                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1707                                    "returning a delegation for "
1708                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1709                                    clp->cl_hostname);
1710                 return;
1711         }
1712         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1713                 nfs_inode_set_delegation(state->inode,
1714                                          data->owner->so_cred,
1715                                          &data->o_res);
1716         else
1717                 nfs_inode_reclaim_delegation(state->inode,
1718                                              data->owner->so_cred,
1719                                              &data->o_res);
1720 }
1721
1722 /*
1723  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1724  * and update the nfs4_state.
1725  */
1726 static struct nfs4_state *
1727 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1728 {
1729         struct inode *inode = data->state->inode;
1730         struct nfs4_state *state = data->state;
1731         int ret;
1732
1733         if (!data->rpc_done) {
1734                 if (data->rpc_status) {
1735                         ret = data->rpc_status;
1736                         goto err;
1737                 }
1738                 /* cached opens have already been processed */
1739                 goto update;
1740         }
1741
1742         ret = nfs_refresh_inode(inode, &data->f_attr);
1743         if (ret)
1744                 goto err;
1745
1746         if (data->o_res.delegation_type != 0)
1747                 nfs4_opendata_check_deleg(data, state);
1748 update:
1749         update_open_stateid(state, &data->o_res.stateid, NULL,
1750                             data->o_arg.fmode);
1751         atomic_inc(&state->count);
1752
1753         return state;
1754 err:
1755         return ERR_PTR(ret);
1756
1757 }
1758
1759 static struct nfs4_state *
1760 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1761 {
1762         struct inode *inode;
1763         struct nfs4_state *state = NULL;
1764         int ret;
1765
1766         if (!data->rpc_done) {
1767                 state = nfs4_try_open_cached(data);
1768                 trace_nfs4_cached_open(data->state);
1769                 goto out;
1770         }
1771
1772         ret = -EAGAIN;
1773         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1774                 goto err;
1775         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1776         ret = PTR_ERR(inode);
1777         if (IS_ERR(inode))
1778                 goto err;
1779         ret = -ENOMEM;
1780         state = nfs4_get_open_state(inode, data->owner);
1781         if (state == NULL)
1782                 goto err_put_inode;
1783         if (data->o_res.delegation_type != 0)
1784                 nfs4_opendata_check_deleg(data, state);
1785         update_open_stateid(state, &data->o_res.stateid, NULL,
1786                         data->o_arg.fmode);
1787         iput(inode);
1788 out:
1789         nfs_release_seqid(data->o_arg.seqid);
1790         return state;
1791 err_put_inode:
1792         iput(inode);
1793 err:
1794         return ERR_PTR(ret);
1795 }
1796
1797 static struct nfs4_state *
1798 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1799 {
1800         struct nfs4_state *ret;
1801
1802         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1803                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
1804         else
1805                 ret = _nfs4_opendata_to_nfs4_state(data);
1806         nfs4_sequence_free_slot(&data->o_res.seq_res);
1807         return ret;
1808 }
1809
1810 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1811 {
1812         struct nfs_inode *nfsi = NFS_I(state->inode);
1813         struct nfs_open_context *ctx;
1814
1815         spin_lock(&state->inode->i_lock);
1816         list_for_each_entry(ctx, &nfsi->open_files, list) {
1817                 if (ctx->state != state)
1818                         continue;
1819                 get_nfs_open_context(ctx);
1820                 spin_unlock(&state->inode->i_lock);
1821                 return ctx;
1822         }
1823         spin_unlock(&state->inode->i_lock);
1824         return ERR_PTR(-ENOENT);
1825 }
1826
1827 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1828                 struct nfs4_state *state, enum open_claim_type4 claim)
1829 {
1830         struct nfs4_opendata *opendata;
1831
1832         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1833                         NULL, NULL, claim, GFP_NOFS);
1834         if (opendata == NULL)
1835                 return ERR_PTR(-ENOMEM);
1836         opendata->state = state;
1837         atomic_inc(&state->count);
1838         return opendata;
1839 }
1840
1841 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1842                 fmode_t fmode)
1843 {
1844         struct nfs4_state *newstate;
1845         int ret;
1846
1847         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1848                 return 0;
1849         opendata->o_arg.open_flags = 0;
1850         opendata->o_arg.fmode = fmode;
1851         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1852                         NFS_SB(opendata->dentry->d_sb),
1853                         fmode, 0);
1854         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1855         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1856         nfs4_init_opendata_res(opendata);
1857         ret = _nfs4_recover_proc_open(opendata);
1858         if (ret != 0)
1859                 return ret;
1860         newstate = nfs4_opendata_to_nfs4_state(opendata);
1861         if (IS_ERR(newstate))
1862                 return PTR_ERR(newstate);
1863         if (newstate != opendata->state)
1864                 ret = -ESTALE;
1865         nfs4_close_state(newstate, fmode);
1866         return ret;
1867 }
1868
1869 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1870 {
1871         int ret;
1872
1873         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1874         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1875         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1876         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1877         /* memory barrier prior to reading state->n_* */
1878         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1879         clear_bit(NFS_OPEN_STATE, &state->flags);
1880         smp_rmb();
1881         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1882         if (ret != 0)
1883                 return ret;
1884         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1885         if (ret != 0)
1886                 return ret;
1887         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1888         if (ret != 0)
1889                 return ret;
1890         /*
1891          * We may have performed cached opens for all three recoveries.
1892          * Check if we need to update the current stateid.
1893          */
1894         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1895             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1896                 write_seqlock(&state->seqlock);
1897                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1898                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1899                 write_sequnlock(&state->seqlock);
1900         }
1901         return 0;
1902 }
1903
1904 /*
1905  * OPEN_RECLAIM:
1906  *      reclaim state on the server after a reboot.
1907  */
1908 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1909 {
1910         struct nfs_delegation *delegation;
1911         struct nfs4_opendata *opendata;
1912         fmode_t delegation_type = 0;
1913         int status;
1914
1915         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1916                         NFS4_OPEN_CLAIM_PREVIOUS);
1917         if (IS_ERR(opendata))
1918                 return PTR_ERR(opendata);
1919         rcu_read_lock();
1920         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1921         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1922                 delegation_type = delegation->type;
1923         rcu_read_unlock();
1924         opendata->o_arg.u.delegation_type = delegation_type;
1925         status = nfs4_open_recover(opendata, state);
1926         nfs4_opendata_put(opendata);
1927         return status;
1928 }
1929
1930 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1931 {
1932         struct nfs_server *server = NFS_SERVER(state->inode);
1933         struct nfs4_exception exception = { };
1934         int err;
1935         do {
1936                 err = _nfs4_do_open_reclaim(ctx, state);
1937                 trace_nfs4_open_reclaim(ctx, 0, err);
1938                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1939                         continue;
1940                 if (err != -NFS4ERR_DELAY)
1941                         break;
1942                 nfs4_handle_exception(server, err, &exception);
1943         } while (exception.retry);
1944         return err;
1945 }
1946
1947 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1948 {
1949         struct nfs_open_context *ctx;
1950         int ret;
1951
1952         ctx = nfs4_state_find_open_context(state);
1953         if (IS_ERR(ctx))
1954                 return -EAGAIN;
1955         ret = nfs4_do_open_reclaim(ctx, state);
1956         put_nfs_open_context(ctx);
1957         return ret;
1958 }
1959
1960 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1961 {
1962         switch (err) {
1963                 default:
1964                         printk(KERN_ERR "NFS: %s: unhandled error "
1965                                         "%d.\n", __func__, err);
1966                 case 0:
1967                 case -ENOENT:
1968                 case -EAGAIN:
1969                 case -ESTALE:
1970                         break;
1971                 case -NFS4ERR_BADSESSION:
1972                 case -NFS4ERR_BADSLOT:
1973                 case -NFS4ERR_BAD_HIGH_SLOT:
1974                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1975                 case -NFS4ERR_DEADSESSION:
1976                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1977                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1978                         return -EAGAIN;
1979                 case -NFS4ERR_STALE_CLIENTID:
1980                 case -NFS4ERR_STALE_STATEID:
1981                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1982                         /* Don't recall a delegation if it was lost */
1983                         nfs4_schedule_lease_recovery(server->nfs_client);
1984                         return -EAGAIN;
1985                 case -NFS4ERR_MOVED:
1986                         nfs4_schedule_migration_recovery(server);
1987                         return -EAGAIN;
1988                 case -NFS4ERR_LEASE_MOVED:
1989                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1990                         return -EAGAIN;
1991                 case -NFS4ERR_DELEG_REVOKED:
1992                 case -NFS4ERR_ADMIN_REVOKED:
1993                 case -NFS4ERR_EXPIRED:
1994                 case -NFS4ERR_BAD_STATEID:
1995                 case -NFS4ERR_OPENMODE:
1996                         nfs_inode_find_state_and_recover(state->inode,
1997                                         stateid);
1998                         nfs4_schedule_stateid_recovery(server, state);
1999                         return -EAGAIN;
2000                 case -NFS4ERR_DELAY:
2001                 case -NFS4ERR_GRACE:
2002                         set_bit(NFS_DELEGATED_STATE, &state->flags);
2003                         ssleep(1);
2004                         return -EAGAIN;
2005                 case -ENOMEM:
2006                 case -NFS4ERR_DENIED:
2007                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
2008                         return 0;
2009         }
2010         return err;
2011 }
2012
2013 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2014                 struct nfs4_state *state, const nfs4_stateid *stateid,
2015                 fmode_t type)
2016 {
2017         struct nfs_server *server = NFS_SERVER(state->inode);
2018         struct nfs4_opendata *opendata;
2019         int err = 0;
2020
2021         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2022                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2023         if (IS_ERR(opendata))
2024                 return PTR_ERR(opendata);
2025         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2026         write_seqlock(&state->seqlock);
2027         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2028         write_sequnlock(&state->seqlock);
2029         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2030         switch (type & (FMODE_READ|FMODE_WRITE)) {
2031         case FMODE_READ|FMODE_WRITE:
2032         case FMODE_WRITE:
2033                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2034                 if (err)
2035                         break;
2036                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2037                 if (err)
2038                         break;
2039         case FMODE_READ:
2040                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2041         }
2042         nfs4_opendata_put(opendata);
2043         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
2044 }
2045
2046 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2047 {
2048         struct nfs4_opendata *data = calldata;
2049
2050         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
2051                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
2052 }
2053
2054 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2055 {
2056         struct nfs4_opendata *data = calldata;
2057
2058         nfs40_sequence_done(task, &data->c_res.seq_res);
2059
2060         data->rpc_status = task->tk_status;
2061         if (data->rpc_status == 0) {
2062                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2063                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2064                 renew_lease(data->o_res.server, data->timestamp);
2065                 data->rpc_done = 1;
2066         }
2067 }
2068
2069 static void nfs4_open_confirm_release(void *calldata)
2070 {
2071         struct nfs4_opendata *data = calldata;
2072         struct nfs4_state *state = NULL;
2073
2074         /* If this request hasn't been cancelled, do nothing */
2075         if (data->cancelled == 0)
2076                 goto out_free;
2077         /* In case of error, no cleanup! */
2078         if (!data->rpc_done)
2079                 goto out_free;
2080         state = nfs4_opendata_to_nfs4_state(data);
2081         if (!IS_ERR(state))
2082                 nfs4_close_state(state, data->o_arg.fmode);
2083 out_free:
2084         nfs4_opendata_put(data);
2085 }
2086
2087 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2088         .rpc_call_prepare = nfs4_open_confirm_prepare,
2089         .rpc_call_done = nfs4_open_confirm_done,
2090         .rpc_release = nfs4_open_confirm_release,
2091 };
2092
2093 /*
2094  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2095  */
2096 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2097 {
2098         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2099         struct rpc_task *task;
2100         struct  rpc_message msg = {
2101                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2102                 .rpc_argp = &data->c_arg,
2103                 .rpc_resp = &data->c_res,
2104                 .rpc_cred = data->owner->so_cred,
2105         };
2106         struct rpc_task_setup task_setup_data = {
2107                 .rpc_client = server->client,
2108                 .rpc_message = &msg,
2109                 .callback_ops = &nfs4_open_confirm_ops,
2110                 .callback_data = data,
2111                 .workqueue = nfsiod_workqueue,
2112                 .flags = RPC_TASK_ASYNC,
2113         };
2114         int status;
2115
2116         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
2117         kref_get(&data->kref);
2118         data->rpc_done = 0;
2119         data->rpc_status = 0;
2120         data->timestamp = jiffies;
2121         if (data->is_recover)
2122                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
2123         task = rpc_run_task(&task_setup_data);
2124         if (IS_ERR(task))
2125                 return PTR_ERR(task);
2126         status = nfs4_wait_for_completion_rpc_task(task);
2127         if (status != 0) {
2128                 data->cancelled = 1;
2129                 smp_wmb();
2130         } else
2131                 status = data->rpc_status;
2132         rpc_put_task(task);
2133         return status;
2134 }
2135
2136 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2137 {
2138         struct nfs4_opendata *data = calldata;
2139         struct nfs4_state_owner *sp = data->owner;
2140         struct nfs_client *clp = sp->so_server->nfs_client;
2141         enum open_claim_type4 claim = data->o_arg.claim;
2142
2143         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2144                 goto out_wait;
2145         /*
2146          * Check if we still need to send an OPEN call, or if we can use
2147          * a delegation instead.
2148          */
2149         if (data->state != NULL) {
2150                 struct nfs_delegation *delegation;
2151
2152                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
2153                         goto out_no_action;
2154                 rcu_read_lock();
2155                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2156                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2157                         goto unlock_no_action;
2158                 rcu_read_unlock();
2159         }
2160         /* Update client id. */
2161         data->o_arg.clientid = clp->cl_clientid;
2162         switch (claim) {
2163         default:
2164                 break;
2165         case NFS4_OPEN_CLAIM_PREVIOUS:
2166         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2167         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2168                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2169         case NFS4_OPEN_CLAIM_FH:
2170                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2171                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
2172         }
2173         data->timestamp = jiffies;
2174         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2175                                 &data->o_arg.seq_args,
2176                                 &data->o_res.seq_res,
2177                                 task) != 0)
2178                 nfs_release_seqid(data->o_arg.seqid);
2179
2180         /* Set the create mode (note dependency on the session type) */
2181         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2182         if (data->o_arg.open_flags & O_EXCL) {
2183                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2184                 if (nfs4_has_persistent_session(clp))
2185                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2186                 else if (clp->cl_mvops->minor_version > 0)
2187                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2188         }
2189         return;
2190 unlock_no_action:
2191         trace_nfs4_cached_open(data->state);
2192         rcu_read_unlock();
2193 out_no_action:
2194         task->tk_action = NULL;
2195 out_wait:
2196         nfs4_sequence_done(task, &data->o_res.seq_res);
2197 }
2198
2199 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2200 {
2201         struct nfs4_opendata *data = calldata;
2202
2203         data->rpc_status = task->tk_status;
2204
2205         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2206                 return;
2207
2208         if (task->tk_status == 0) {
2209                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2210                         switch (data->o_res.f_attr->mode & S_IFMT) {
2211                         case S_IFREG:
2212                                 break;
2213                         case S_IFLNK:
2214                                 data->rpc_status = -ELOOP;
2215                                 break;
2216                         case S_IFDIR:
2217                                 data->rpc_status = -EISDIR;
2218                                 break;
2219                         default:
2220                                 data->rpc_status = -ENOTDIR;
2221                         }
2222                 }
2223                 renew_lease(data->o_res.server, data->timestamp);
2224                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2225                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2226         }
2227         data->rpc_done = 1;
2228 }
2229
2230 static void nfs4_open_release(void *calldata)
2231 {
2232         struct nfs4_opendata *data = calldata;
2233         struct nfs4_state *state = NULL;
2234
2235         /* If this request hasn't been cancelled, do nothing */
2236         if (data->cancelled == 0)
2237                 goto out_free;
2238         /* In case of error, no cleanup! */
2239         if (data->rpc_status != 0 || !data->rpc_done)
2240                 goto out_free;
2241         /* In case we need an open_confirm, no cleanup! */
2242         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2243                 goto out_free;
2244         state = nfs4_opendata_to_nfs4_state(data);
2245         if (!IS_ERR(state))
2246                 nfs4_close_state(state, data->o_arg.fmode);
2247 out_free:
2248         nfs4_opendata_put(data);
2249 }
2250
2251 static const struct rpc_call_ops nfs4_open_ops = {
2252         .rpc_call_prepare = nfs4_open_prepare,
2253         .rpc_call_done = nfs4_open_done,
2254         .rpc_release = nfs4_open_release,
2255 };
2256
2257 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2258 {
2259         struct inode *dir = d_inode(data->dir);
2260         struct nfs_server *server = NFS_SERVER(dir);
2261         struct nfs_openargs *o_arg = &data->o_arg;
2262         struct nfs_openres *o_res = &data->o_res;
2263         struct rpc_task *task;
2264         struct rpc_message msg = {
2265                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2266                 .rpc_argp = o_arg,
2267                 .rpc_resp = o_res,
2268                 .rpc_cred = data->owner->so_cred,
2269         };
2270         struct rpc_task_setup task_setup_data = {
2271                 .rpc_client = server->client,
2272                 .rpc_message = &msg,
2273                 .callback_ops = &nfs4_open_ops,
2274                 .callback_data = data,
2275                 .workqueue = nfsiod_workqueue,
2276                 .flags = RPC_TASK_ASYNC,
2277         };
2278         int status;
2279
2280         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2281         kref_get(&data->kref);
2282         data->rpc_done = 0;
2283         data->rpc_status = 0;
2284         data->cancelled = 0;
2285         data->is_recover = 0;
2286         if (isrecover) {
2287                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2288                 data->is_recover = 1;
2289         }
2290         task = rpc_run_task(&task_setup_data);
2291         if (IS_ERR(task))
2292                 return PTR_ERR(task);
2293         status = nfs4_wait_for_completion_rpc_task(task);
2294         if (status != 0) {
2295                 data->cancelled = 1;
2296                 smp_wmb();
2297         } else
2298                 status = data->rpc_status;
2299         rpc_put_task(task);
2300
2301         return status;
2302 }
2303
2304 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2305 {
2306         struct inode *dir = d_inode(data->dir);
2307         struct nfs_openres *o_res = &data->o_res;
2308         int status;
2309
2310         status = nfs4_run_open_task(data, 1);
2311         if (status != 0 || !data->rpc_done)
2312                 return status;
2313
2314         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2315
2316         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2317                 status = _nfs4_proc_open_confirm(data);
2318                 if (status != 0)
2319                         return status;
2320         }
2321
2322         return status;
2323 }
2324
2325 /*
2326  * Additional permission checks in order to distinguish between an
2327  * open for read, and an open for execute. This works around the
2328  * fact that NFSv4 OPEN treats read and execute permissions as being
2329  * the same.
2330  * Note that in the non-execute case, we want to turn off permission
2331  * checking if we just created a new file (POSIX open() semantics).
2332  */
2333 static int nfs4_opendata_access(struct rpc_cred *cred,
2334                                 struct nfs4_opendata *opendata,
2335                                 struct nfs4_state *state, fmode_t fmode,
2336                                 int openflags)
2337 {
2338         struct nfs_access_entry cache;
2339         u32 mask;
2340
2341         /* access call failed or for some reason the server doesn't
2342          * support any access modes -- defer access call until later */
2343         if (opendata->o_res.access_supported == 0)
2344                 return 0;
2345
2346         mask = 0;
2347         /*
2348          * Use openflags to check for exec, because fmode won't
2349          * always have FMODE_EXEC set when file open for exec.
2350          */
2351         if (openflags & __FMODE_EXEC) {
2352                 /* ONLY check for exec rights */
2353                 mask = MAY_EXEC;
2354         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2355                 mask = MAY_READ;
2356
2357         cache.cred = cred;
2358         cache.jiffies = jiffies;
2359         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2360         nfs_access_add_cache(state->inode, &cache);
2361
2362         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2363                 return 0;
2364
2365         /* even though OPEN succeeded, access is denied. Close the file */
2366         nfs4_close_state(state, fmode);
2367         return -EACCES;
2368 }
2369
2370 /*
2371  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2372  */
2373 static int _nfs4_proc_open(struct nfs4_opendata *data)
2374 {
2375         struct inode *dir = d_inode(data->dir);
2376         struct nfs_server *server = NFS_SERVER(dir);
2377         struct nfs_openargs *o_arg = &data->o_arg;
2378         struct nfs_openres *o_res = &data->o_res;
2379         int status;
2380
2381         status = nfs4_run_open_task(data, 0);
2382         if (!data->rpc_done)
2383                 return status;
2384         if (status != 0) {
2385                 if (status == -NFS4ERR_BADNAME &&
2386                                 !(o_arg->open_flags & O_CREAT))
2387                         return -ENOENT;
2388                 return status;
2389         }
2390
2391         nfs_fattr_map_and_free_names(server, &data->f_attr);
2392
2393         if (o_arg->open_flags & O_CREAT) {
2394                 if (o_arg->open_flags & O_EXCL)
2395                         data->file_created = 1;
2396                 else if (o_res->cinfo.before != o_res->cinfo.after)
2397                         data->file_created = 1;
2398                 if (data->file_created || dir->i_version != o_res->cinfo.after)
2399                         update_changeattr(dir, &o_res->cinfo,
2400                                         o_res->f_attr->time_start);
2401         }
2402         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2403                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2404         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2405                 status = _nfs4_proc_open_confirm(data);
2406                 if (status != 0)
2407                         return status;
2408         }
2409         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2410                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2411         return 0;
2412 }
2413
2414 static int nfs4_recover_expired_lease(struct nfs_server *server)
2415 {
2416         return nfs4_client_recover_expired_lease(server->nfs_client);
2417 }
2418
2419 /*
2420  * OPEN_EXPIRED:
2421  *      reclaim state on the server after a network partition.
2422  *      Assumes caller holds the appropriate lock
2423  */
2424 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2425 {
2426         struct nfs4_opendata *opendata;
2427         int ret;
2428
2429         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2430                         NFS4_OPEN_CLAIM_FH);
2431         if (IS_ERR(opendata))
2432                 return PTR_ERR(opendata);
2433         ret = nfs4_open_recover(opendata, state);
2434         if (ret == -ESTALE)
2435                 d_drop(ctx->dentry);
2436         nfs4_opendata_put(opendata);
2437         return ret;
2438 }
2439
2440 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2441 {
2442         struct nfs_server *server = NFS_SERVER(state->inode);
2443         struct nfs4_exception exception = { };
2444         int err;
2445
2446         do {
2447                 err = _nfs4_open_expired(ctx, state);
2448                 trace_nfs4_open_expired(ctx, 0, err);
2449                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2450                         continue;
2451                 switch (err) {
2452                 default:
2453                         goto out;
2454                 case -NFS4ERR_GRACE:
2455                 case -NFS4ERR_DELAY:
2456                         nfs4_handle_exception(server, err, &exception);
2457                         err = 0;
2458                 }
2459         } while (exception.retry);
2460 out:
2461         return err;
2462 }
2463
2464 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2465 {
2466         struct nfs_open_context *ctx;
2467         int ret;
2468
2469         ctx = nfs4_state_find_open_context(state);
2470         if (IS_ERR(ctx))
2471                 return -EAGAIN;
2472         ret = nfs4_do_open_expired(ctx, state);
2473         put_nfs_open_context(ctx);
2474         return ret;
2475 }
2476
2477 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2478                 const nfs4_stateid *stateid)
2479 {
2480         nfs_remove_bad_delegation(state->inode, stateid);
2481         write_seqlock(&state->seqlock);
2482         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2483         write_sequnlock(&state->seqlock);
2484         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2485 }
2486
2487 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2488 {
2489         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2490                 nfs_finish_clear_delegation_stateid(state, NULL);
2491 }
2492
2493 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2494 {
2495         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2496         nfs40_clear_delegation_stateid(state);
2497         return nfs4_open_expired(sp, state);
2498 }
2499
2500 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2501                 nfs4_stateid *stateid,
2502                 struct rpc_cred *cred)
2503 {
2504         return -NFS4ERR_BAD_STATEID;
2505 }
2506
2507 #if defined(CONFIG_NFS_V4_1)
2508 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2509                 nfs4_stateid *stateid,
2510                 struct rpc_cred *cred)
2511 {
2512         int status;
2513
2514         switch (stateid->type) {
2515         default:
2516                 break;
2517         case NFS4_INVALID_STATEID_TYPE:
2518         case NFS4_SPECIAL_STATEID_TYPE:
2519                 return -NFS4ERR_BAD_STATEID;
2520         case NFS4_REVOKED_STATEID_TYPE:
2521                 goto out_free;
2522         }
2523
2524         status = nfs41_test_stateid(server, stateid, cred);
2525         switch (status) {
2526         case -NFS4ERR_EXPIRED:
2527         case -NFS4ERR_ADMIN_REVOKED:
2528         case -NFS4ERR_DELEG_REVOKED:
2529                 break;
2530         default:
2531                 return status;
2532         }
2533 out_free:
2534         /* Ack the revoked state to the server */
2535         nfs41_free_stateid(server, stateid, cred, true);
2536         return -NFS4ERR_EXPIRED;
2537 }
2538
2539 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2540 {
2541         struct nfs_server *server = NFS_SERVER(state->inode);
2542         nfs4_stateid stateid;
2543         struct nfs_delegation *delegation;
2544         struct rpc_cred *cred;
2545         int status;
2546
2547         /* Get the delegation credential for use by test/free_stateid */
2548         rcu_read_lock();
2549         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2550         if (delegation == NULL) {
2551                 rcu_read_unlock();
2552                 return;
2553         }
2554
2555         nfs4_stateid_copy(&stateid, &delegation->stateid);
2556         if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
2557                 rcu_read_unlock();
2558                 nfs_finish_clear_delegation_stateid(state, &stateid);
2559                 return;
2560         }
2561
2562         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) {
2563                 rcu_read_unlock();
2564                 return;
2565         }
2566
2567         cred = get_rpccred(delegation->cred);
2568         rcu_read_unlock();
2569         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2570         trace_nfs4_test_delegation_stateid(state, NULL, status);
2571         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2572                 nfs_finish_clear_delegation_stateid(state, &stateid);
2573
2574         put_rpccred(cred);
2575 }
2576
2577 /**
2578  * nfs41_check_expired_locks - possibly free a lock stateid
2579  *
2580  * @state: NFSv4 state for an inode
2581  *
2582  * Returns NFS_OK if recovery for this stateid is now finished.
2583  * Otherwise a negative NFS4ERR value is returned.
2584  */
2585 static int nfs41_check_expired_locks(struct nfs4_state *state)
2586 {
2587         int status, ret = NFS_OK;
2588         struct nfs4_lock_state *lsp, *prev = NULL;
2589         struct nfs_server *server = NFS_SERVER(state->inode);
2590
2591         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2592                 goto out;
2593
2594         spin_lock(&state->state_lock);
2595         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2596                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2597                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
2598
2599                         atomic_inc(&lsp->ls_count);
2600                         spin_unlock(&state->state_lock);
2601
2602                         nfs4_put_lock_state(prev);
2603                         prev = lsp;
2604
2605                         status = nfs41_test_and_free_expired_stateid(server,
2606                                         &lsp->ls_stateid,
2607                                         cred);
2608                         trace_nfs4_test_lock_stateid(state, lsp, status);
2609                         if (status == -NFS4ERR_EXPIRED ||
2610                             status == -NFS4ERR_BAD_STATEID) {
2611                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2612                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2613                                 if (!recover_lost_locks)
2614                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2615                         } else if (status != NFS_OK) {
2616                                 ret = status;
2617                                 nfs4_put_lock_state(prev);
2618                                 goto out;
2619                         }
2620                         spin_lock(&state->state_lock);
2621                 }
2622         }
2623         spin_unlock(&state->state_lock);
2624         nfs4_put_lock_state(prev);
2625 out:
2626         return ret;
2627 }
2628
2629 /**
2630  * nfs41_check_open_stateid - possibly free an open stateid
2631  *
2632  * @state: NFSv4 state for an inode
2633  *
2634  * Returns NFS_OK if recovery for this stateid is now finished.
2635  * Otherwise a negative NFS4ERR value is returned.
2636  */
2637 static int nfs41_check_open_stateid(struct nfs4_state *state)
2638 {
2639         struct nfs_server *server = NFS_SERVER(state->inode);
2640         nfs4_stateid *stateid = &state->open_stateid;
2641         struct rpc_cred *cred = state->owner->so_cred;
2642         int status;
2643
2644         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) {
2645                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)  {
2646                         if (nfs4_have_delegation(state->inode, state->state))
2647                                 return NFS_OK;
2648                         return -NFS4ERR_OPENMODE;
2649                 }
2650                 return -NFS4ERR_BAD_STATEID;
2651         }
2652         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2653         trace_nfs4_test_open_stateid(state, NULL, status);
2654         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2655                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2656                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2657                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2658                 clear_bit(NFS_OPEN_STATE, &state->flags);
2659                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2660         }
2661         if (status != NFS_OK)
2662                 return status;
2663         if (nfs_open_stateid_recover_openmode(state))
2664                 return -NFS4ERR_OPENMODE;
2665         return NFS_OK;
2666 }
2667
2668 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2669 {
2670         int status;
2671
2672         nfs41_check_delegation_stateid(state);
2673         status = nfs41_check_expired_locks(state);
2674         if (status != NFS_OK)
2675                 return status;
2676         status = nfs41_check_open_stateid(state);
2677         if (status != NFS_OK)
2678                 status = nfs4_open_expired(sp, state);
2679         return status;
2680 }
2681 #endif
2682
2683 /*
2684  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2685  * fields corresponding to attributes that were used to store the verifier.
2686  * Make sure we clobber those fields in the later setattr call
2687  */
2688 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2689                                 struct iattr *sattr, struct nfs4_label **label)
2690 {
2691         const u32 *attrset = opendata->o_res.attrset;
2692
2693         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2694             !(sattr->ia_valid & ATTR_ATIME_SET))
2695                 sattr->ia_valid |= ATTR_ATIME;
2696
2697         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2698             !(sattr->ia_valid & ATTR_MTIME_SET))
2699                 sattr->ia_valid |= ATTR_MTIME;
2700
2701         /* Except MODE, it seems harmless of setting twice. */
2702         if (opendata->o_arg.createmode != NFS4_CREATE_EXCLUSIVE &&
2703                 attrset[1] & FATTR4_WORD1_MODE)
2704                 sattr->ia_valid &= ~ATTR_MODE;
2705
2706         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2707                 *label = NULL;
2708 }
2709
2710 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2711                 fmode_t fmode,
2712                 int flags,
2713                 struct nfs_open_context *ctx)
2714 {
2715         struct nfs4_state_owner *sp = opendata->owner;
2716         struct nfs_server *server = sp->so_server;
2717         struct dentry *dentry;
2718         struct nfs4_state *state;
2719         unsigned int seq;
2720         int ret;
2721
2722         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2723
2724         ret = _nfs4_proc_open(opendata);
2725         if (ret != 0)
2726                 goto out;
2727
2728         state = nfs4_opendata_to_nfs4_state(opendata);
2729         ret = PTR_ERR(state);
2730         if (IS_ERR(state))
2731                 goto out;
2732         if (server->caps & NFS_CAP_POSIX_LOCK)
2733                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2734         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
2735                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
2736
2737         dentry = opendata->dentry;
2738         if (d_really_is_negative(dentry)) {
2739                 struct dentry *alias;
2740                 d_drop(dentry);
2741                 alias = d_exact_alias(dentry, state->inode);
2742                 if (!alias)
2743                         alias = d_splice_alias(igrab(state->inode), dentry);
2744                 /* d_splice_alias() can't fail here - it's a non-directory */
2745                 if (alias) {
2746                         dput(ctx->dentry);
2747                         ctx->dentry = dentry = alias;
2748                 }
2749                 nfs_set_verifier(dentry,
2750                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2751         }
2752
2753         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2754         if (ret != 0)
2755                 goto out;
2756
2757         ctx->state = state;
2758         if (d_inode(dentry) == state->inode) {
2759                 nfs_inode_attach_open_context(ctx);
2760                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2761                         nfs4_schedule_stateid_recovery(server, state);
2762         }
2763 out:
2764         return ret;
2765 }
2766
2767 /*
2768  * Returns a referenced nfs4_state
2769  */
2770 static int _nfs4_do_open(struct inode *dir,
2771                         struct nfs_open_context *ctx,
2772                         int flags,
2773                         struct iattr *sattr,
2774                         struct nfs4_label *label,
2775                         int *opened)
2776 {
2777         struct nfs4_state_owner  *sp;
2778         struct nfs4_state     *state = NULL;
2779         struct nfs_server       *server = NFS_SERVER(dir);
2780         struct nfs4_opendata *opendata;
2781         struct dentry *dentry = ctx->dentry;
2782         struct rpc_cred *cred = ctx->cred;
2783         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2784         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2785         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2786         struct nfs4_label *olabel = NULL;
2787         int status;
2788
2789         /* Protect against reboot recovery conflicts */
2790         status = -ENOMEM;
2791         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2792         if (sp == NULL) {
2793                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2794                 goto out_err;
2795         }
2796         status = nfs4_recover_expired_lease(server);
2797         if (status != 0)
2798                 goto err_put_state_owner;
2799         if (d_really_is_positive(dentry))
2800                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2801         status = -ENOMEM;
2802         if (d_really_is_positive(dentry))
2803                 claim = NFS4_OPEN_CLAIM_FH;
2804         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2805                         label, claim, GFP_KERNEL);
2806         if (opendata == NULL)
2807                 goto err_put_state_owner;
2808
2809         if (label) {
2810                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2811                 if (IS_ERR(olabel)) {
2812                         status = PTR_ERR(olabel);
2813                         goto err_opendata_put;
2814                 }
2815         }
2816
2817         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2818                 if (!opendata->f_attr.mdsthreshold) {
2819                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2820                         if (!opendata->f_attr.mdsthreshold)
2821                                 goto err_free_label;
2822                 }
2823                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2824         }
2825         if (d_really_is_positive(dentry))
2826                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2827
2828         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2829         if (status != 0)
2830                 goto err_free_label;
2831         state = ctx->state;
2832
2833         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2834             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2835                 nfs4_exclusive_attrset(opendata, sattr, &label);
2836                 /*
2837                  * send create attributes which was not set by open
2838                  * with an extra setattr.
2839                  */
2840                 if (sattr->ia_valid & NFS4_VALID_ATTRS) {
2841                         nfs_fattr_init(opendata->o_res.f_attr);
2842                         status = nfs4_do_setattr(state->inode, cred,
2843                                         opendata->o_res.f_attr, sattr,
2844                                         ctx, label, olabel);
2845                         if (status == 0) {
2846                                 nfs_setattr_update_inode(state->inode, sattr,
2847                                                 opendata->o_res.f_attr);
2848                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2849                         }
2850                 }
2851         }
2852         if (opened && opendata->file_created)
2853                 *opened |= FILE_CREATED;
2854
2855         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2856                 *ctx_th = opendata->f_attr.mdsthreshold;
2857                 opendata->f_attr.mdsthreshold = NULL;
2858         }
2859
2860         nfs4_label_free(olabel);
2861
2862         nfs4_opendata_put(opendata);
2863         nfs4_put_state_owner(sp);
2864         return 0;
2865 err_free_label:
2866         nfs4_label_free(olabel);
2867 err_opendata_put:
2868         nfs4_opendata_put(opendata);
2869 err_put_state_owner:
2870         nfs4_put_state_owner(sp);
2871 out_err:
2872         return status;
2873 }
2874
2875
2876 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2877                                         struct nfs_open_context *ctx,
2878                                         int flags,
2879                                         struct iattr *sattr,
2880                                         struct nfs4_label *label,
2881                                         int *opened)
2882 {
2883         struct nfs_server *server = NFS_SERVER(dir);
2884         struct nfs4_exception exception = { };
2885         struct nfs4_state *res;
2886         int status;
2887
2888         do {
2889                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2890                 res = ctx->state;
2891                 trace_nfs4_open_file(ctx, flags, status);
2892                 if (status == 0)
2893                         break;
2894                 /* NOTE: BAD_SEQID means the server and client disagree about the
2895                  * book-keeping w.r.t. state-changing operations
2896                  * (OPEN/CLOSE/LOCK/LOCKU...)
2897                  * It is actually a sign of a bug on the client or on the server.
2898                  *
2899                  * If we receive a BAD_SEQID error in the particular case of
2900                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2901                  * have unhashed the old state_owner for us, and that we can
2902                  * therefore safely retry using a new one. We should still warn
2903                  * the user though...
2904                  */
2905                 if (status == -NFS4ERR_BAD_SEQID) {
2906                         pr_warn_ratelimited("NFS: v4 server %s "
2907                                         " returned a bad sequence-id error!\n",
2908                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2909                         exception.retry = 1;
2910                         continue;
2911                 }
2912                 /*
2913                  * BAD_STATEID on OPEN means that the server cancelled our
2914                  * state before it received the OPEN_CONFIRM.
2915                  * Recover by retrying the request as per the discussion
2916                  * on Page 181 of RFC3530.
2917                  */
2918                 if (status == -NFS4ERR_BAD_STATEID) {
2919                         exception.retry = 1;
2920                         continue;
2921                 }
2922                 if (status == -EAGAIN) {
2923                         /* We must have found a delegation */
2924                         exception.retry = 1;
2925                         continue;
2926                 }
2927                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2928                         continue;
2929                 res = ERR_PTR(nfs4_handle_exception(server,
2930                                         status, &exception));
2931         } while (exception.retry);
2932         return res;
2933 }
2934
2935 static int _nfs4_do_setattr(struct inode *inode,
2936                             struct nfs_setattrargs *arg,
2937                             struct nfs_setattrres *res,
2938                             struct rpc_cred *cred,
2939                             struct nfs_open_context *ctx)
2940 {
2941         struct nfs_server *server = NFS_SERVER(inode);
2942         struct rpc_message msg = {
2943                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2944                 .rpc_argp       = arg,
2945                 .rpc_resp       = res,
2946                 .rpc_cred       = cred,
2947         };
2948         struct rpc_cred *delegation_cred = NULL;
2949         unsigned long timestamp = jiffies;
2950         fmode_t fmode;
2951         bool truncate;
2952         int status;
2953
2954         nfs_fattr_init(res->fattr);
2955
2956         /* Servers should only apply open mode checks for file size changes */
2957         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
2958         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2959
2960         if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) {
2961                 /* Use that stateid */
2962         } else if (truncate && ctx != NULL) {
2963                 struct nfs_lock_context *l_ctx;
2964                 if (!nfs4_valid_open_stateid(ctx->state))
2965                         return -EBADF;
2966                 l_ctx = nfs_get_lock_context(ctx);
2967                 if (IS_ERR(l_ctx))
2968                         return PTR_ERR(l_ctx);
2969                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
2970                                                 &arg->stateid, &delegation_cred);
2971                 nfs_put_lock_context(l_ctx);
2972                 if (status == -EIO)
2973                         return -EBADF;
2974         } else
2975                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
2976         if (delegation_cred)
2977                 msg.rpc_cred = delegation_cred;
2978
2979         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
2980
2981         put_rpccred(delegation_cred);
2982         if (status == 0 && ctx != NULL)
2983                 renew_lease(server, timestamp);
2984         trace_nfs4_setattr(inode, &arg->stateid, status);
2985         return status;
2986 }
2987
2988 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2989                            struct nfs_fattr *fattr, struct iattr *sattr,
2990                            struct nfs_open_context *ctx, struct nfs4_label *ilabel,
2991                            struct nfs4_label *olabel)
2992 {
2993         struct nfs_server *server = NFS_SERVER(inode);
2994         struct nfs4_state *state = ctx ? ctx->state : NULL;
2995         struct nfs_setattrargs  arg = {
2996                 .fh             = NFS_FH(inode),
2997                 .iap            = sattr,
2998                 .server         = server,
2999                 .bitmask = server->attr_bitmask,
3000                 .label          = ilabel,
3001         };
3002         struct nfs_setattrres  res = {
3003                 .fattr          = fattr,
3004                 .label          = olabel,
3005                 .server         = server,
3006         };
3007         struct nfs4_exception exception = {
3008                 .state = state,
3009                 .inode = inode,
3010                 .stateid = &arg.stateid,
3011         };
3012         int err;
3013
3014         arg.bitmask = nfs4_bitmask(server, ilabel);
3015         if (ilabel)
3016                 arg.bitmask = nfs4_bitmask(server, olabel);
3017
3018         do {
3019                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3020                 switch (err) {
3021                 case -NFS4ERR_OPENMODE:
3022                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3023                                 pr_warn_once("NFSv4: server %s is incorrectly "
3024                                                 "applying open mode checks to "
3025                                                 "a SETATTR that is not "
3026                                                 "changing file size.\n",
3027                                                 server->nfs_client->cl_hostname);
3028                         }
3029                         if (state && !(state->state & FMODE_WRITE)) {
3030                                 err = -EBADF;
3031                                 if (sattr->ia_valid & ATTR_OPEN)
3032                                         err = -EACCES;
3033                                 goto out;
3034                         }
3035                 }
3036                 err = nfs4_handle_exception(server, err, &exception);
3037         } while (exception.retry);
3038 out:
3039         return err;
3040 }
3041
3042 static bool
3043 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3044 {
3045         if (inode == NULL || !nfs_have_layout(inode))
3046                 return false;
3047
3048         return pnfs_wait_on_layoutreturn(inode, task);
3049 }
3050
3051 struct nfs4_closedata {
3052         struct inode *inode;
3053         struct nfs4_state *state;
3054         struct nfs_closeargs arg;
3055         struct nfs_closeres res;
3056         struct {
3057                 struct nfs4_layoutreturn_args arg;
3058                 struct nfs4_layoutreturn_res res;
3059                 struct nfs4_xdr_opaque_data ld_private;
3060                 u32 roc_barrier;
3061                 bool roc;
3062         } lr;
3063         struct nfs_fattr fattr;
3064         unsigned long timestamp;
3065 };
3066
3067 static void nfs4_free_closedata(void *data)
3068 {
3069         struct nfs4_closedata *calldata = data;
3070         struct nfs4_state_owner *sp = calldata->state->owner;
3071         struct super_block *sb = calldata->state->inode->i_sb;
3072
3073         if (calldata->lr.roc)
3074                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3075                                 calldata->res.lr_ret);
3076         nfs4_put_open_state(calldata->state);
3077         nfs_free_seqid(calldata->arg.seqid);
3078         nfs4_put_state_owner(sp);
3079         nfs_sb_deactive(sb);
3080         kfree(calldata);
3081 }
3082
3083 static void nfs4_close_done(struct rpc_task *task, void *data)
3084 {
3085         struct nfs4_closedata *calldata = data;
3086         struct nfs4_state *state = calldata->state;
3087         struct nfs_server *server = NFS_SERVER(calldata->inode);
3088         nfs4_stateid *res_stateid = NULL;
3089
3090         dprintk("%s: begin!\n", __func__);
3091         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3092                 return;
3093         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3094
3095         /* Handle Layoutreturn errors */
3096         if (calldata->arg.lr_args && task->tk_status != 0) {
3097                 switch (calldata->res.lr_ret) {
3098                 default:
3099                         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3100                         break;
3101                 case 0:
3102                         calldata->arg.lr_args = NULL;
3103                         calldata->res.lr_res = NULL;
3104                         break;
3105                 case -NFS4ERR_ADMIN_REVOKED:
3106                 case -NFS4ERR_DELEG_REVOKED:
3107                 case -NFS4ERR_EXPIRED:
3108                 case -NFS4ERR_BAD_STATEID:
3109                 case -NFS4ERR_OLD_STATEID:
3110                 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
3111                 case -NFS4ERR_WRONG_CRED:
3112                         calldata->arg.lr_args = NULL;
3113                         calldata->res.lr_res = NULL;
3114                         calldata->res.lr_ret = 0;
3115                         rpc_restart_call_prepare(task);
3116                         return;
3117                 }
3118         }
3119
3120         /* hmm. we are done with the inode, and in the process of freeing
3121          * the state_owner. we keep this around to process errors
3122          */
3123         switch (task->tk_status) {
3124                 case 0:
3125                         res_stateid = &calldata->res.stateid;
3126                         renew_lease(server, calldata->timestamp);
3127                         break;
3128                 case -NFS4ERR_ACCESS:
3129                         if (calldata->arg.bitmask != NULL) {
3130                                 calldata->arg.bitmask = NULL;
3131                                 calldata->res.fattr = NULL;
3132                                 task->tk_status = 0;
3133                                 rpc_restart_call_prepare(task);
3134                                 goto out_release;
3135
3136                         }
3137                         break;
3138                 case -NFS4ERR_ADMIN_REVOKED:
3139                 case -NFS4ERR_STALE_STATEID:
3140                 case -NFS4ERR_EXPIRED:
3141                         nfs4_free_revoked_stateid(server,
3142                                         &calldata->arg.stateid,
3143                                         task->tk_msg.rpc_cred);
3144                 case -NFS4ERR_OLD_STATEID:
3145                 case -NFS4ERR_BAD_STATEID:
3146                         if (!nfs4_stateid_match(&calldata->arg.stateid,
3147                                                 &state->open_stateid)) {
3148                                 rpc_restart_call_prepare(task);
3149                                 goto out_release;
3150                         }
3151                         if (calldata->arg.fmode == 0)
3152                                 break;
3153                 default:
3154                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
3155                                 rpc_restart_call_prepare(task);
3156                                 goto out_release;
3157                         }
3158         }
3159         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3160                         res_stateid, calldata->arg.fmode);
3161 out_release:
3162         nfs_release_seqid(calldata->arg.seqid);
3163         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3164         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3165 }
3166
3167 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3168 {
3169         struct nfs4_closedata *calldata = data;
3170         struct nfs4_state *state = calldata->state;
3171         struct inode *inode = calldata->inode;
3172         bool is_rdonly, is_wronly, is_rdwr;
3173         int call_close = 0;
3174
3175         dprintk("%s: begin!\n", __func__);
3176         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3177                 goto out_wait;
3178
3179         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3180         spin_lock(&state->owner->so_lock);
3181         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3182         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3183         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3184         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
3185         /* Calculate the change in open mode */
3186         calldata->arg.fmode = 0;
3187         if (state->n_rdwr == 0) {
3188                 if (state->n_rdonly == 0)
3189                         call_close |= is_rdonly;
3190                 else if (is_rdonly)
3191                         calldata->arg.fmode |= FMODE_READ;
3192                 if (state->n_wronly == 0)
3193                         call_close |= is_wronly;
3194                 else if (is_wronly)
3195                         calldata->arg.fmode |= FMODE_WRITE;
3196                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3197                         call_close |= is_rdwr;
3198         } else if (is_rdwr)
3199                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3200
3201         if (!nfs4_valid_open_stateid(state) ||
3202             test_bit(NFS_OPEN_STATE, &state->flags) == 0)
3203                 call_close = 0;
3204         spin_unlock(&state->owner->so_lock);
3205
3206         if (!call_close) {
3207                 /* Note: exit _without_ calling nfs4_close_done */
3208                 goto out_no_action;
3209         }
3210
3211         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3212                 nfs_release_seqid(calldata->arg.seqid);
3213                 goto out_wait;
3214         }
3215
3216         if (calldata->arg.fmode == 0)
3217                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3218
3219         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3220                 /* Close-to-open cache consistency revalidation */
3221                 if (!nfs4_have_delegation(inode, FMODE_READ))
3222                         calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3223                 else
3224                         calldata->arg.bitmask = NULL;
3225         }
3226
3227         calldata->arg.share_access =
3228                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3229                                 calldata->arg.fmode, 0);
3230
3231         if (calldata->res.fattr == NULL)
3232                 calldata->arg.bitmask = NULL;
3233         else if (calldata->arg.bitmask == NULL)
3234                 calldata->res.fattr = NULL;
3235         calldata->timestamp = jiffies;
3236         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3237                                 &calldata->arg.seq_args,
3238                                 &calldata->res.seq_res,
3239                                 task) != 0)
3240                 nfs_release_seqid(calldata->arg.seqid);
3241         dprintk("%s: done!\n", __func__);
3242         return;
3243 out_no_action:
3244         task->tk_action = NULL;
3245 out_wait:
3246         nfs4_sequence_done(task, &calldata->res.seq_res);
3247 }
3248
3249 static const struct rpc_call_ops nfs4_close_ops = {
3250         .rpc_call_prepare = nfs4_close_prepare,
3251         .rpc_call_done = nfs4_close_done,
3252         .rpc_release = nfs4_free_closedata,
3253 };
3254
3255 /*
3256  * It is possible for data to be read/written from a mem-mapped file
3257  * after the sys_close call (which hits the vfs layer as a flush).
3258  * This means that we can't safely call nfsv4 close on a file until
3259  * the inode is cleared. This in turn means that we are not good
3260  * NFSv4 citizens - we do not indicate to the server to update the file's
3261  * share state even when we are done with one of the three share
3262  * stateid's in the inode.
3263  *
3264  * NOTE: Caller must be holding the sp->so_owner semaphore!
3265  */
3266 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3267 {
3268         struct nfs_server *server = NFS_SERVER(state->inode);
3269         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3270         struct nfs4_closedata *calldata;
3271         struct nfs4_state_owner *sp = state->owner;
3272         struct rpc_task *task;
3273         struct rpc_message msg = {
3274                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3275                 .rpc_cred = state->owner->so_cred,
3276         };
3277         struct rpc_task_setup task_setup_data = {
3278                 .rpc_client = server->client,
3279                 .rpc_message = &msg,
3280                 .callback_ops = &nfs4_close_ops,
3281                 .workqueue = nfsiod_workqueue,
3282                 .flags = RPC_TASK_ASYNC,
3283         };
3284         int status = -ENOMEM;
3285
3286         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3287                 &task_setup_data.rpc_client, &msg);
3288
3289         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3290         if (calldata == NULL)
3291                 goto out;
3292         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
3293         calldata->inode = state->inode;
3294         calldata->state = state;
3295         calldata->arg.fh = NFS_FH(state->inode);
3296         /* Serialization for the sequence id */
3297         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3298         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3299         if (IS_ERR(calldata->arg.seqid))
3300                 goto out_free_calldata;
3301         nfs_fattr_init(&calldata->fattr);
3302         calldata->arg.fmode = 0;
3303         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3304         calldata->res.fattr = &calldata->fattr;
3305         calldata->res.seqid = calldata->arg.seqid;
3306         calldata->res.server = server;
3307         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3308         calldata->lr.roc = pnfs_roc(state->inode,
3309                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3310         if (calldata->lr.roc) {
3311                 calldata->arg.lr_args = &calldata->lr.arg;
3312                 calldata->res.lr_res = &calldata->lr.res;
3313         }
3314         nfs_sb_active(calldata->inode->i_sb);
3315
3316         msg.rpc_argp = &calldata->arg;
3317         msg.rpc_resp = &calldata->res;
3318         task_setup_data.callback_data = calldata;
3319         task = rpc_run_task(&task_setup_data);
3320         if (IS_ERR(task))
3321                 return PTR_ERR(task);
3322         status = 0;
3323         if (wait)
3324                 status = rpc_wait_for_completion_task(task);
3325         rpc_put_task(task);
3326         return status;
3327 out_free_calldata:
3328         kfree(calldata);
3329 out:
3330         nfs4_put_open_state(state);
3331         nfs4_put_state_owner(sp);
3332         return status;
3333 }
3334
3335 static struct inode *
3336 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3337                 int open_flags, struct iattr *attr, int *opened)
3338 {
3339         struct nfs4_state *state;
3340         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3341
3342         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3343
3344         /* Protect against concurrent sillydeletes */
3345         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3346
3347         nfs4_label_release_security(label);
3348
3349         if (IS_ERR(state))
3350                 return ERR_CAST(state);
3351         return state->inode;
3352 }
3353
3354 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3355 {
3356         if (ctx->state == NULL)
3357                 return;
3358         if (is_sync)
3359                 nfs4_close_sync(ctx->state, ctx->mode);
3360         else
3361                 nfs4_close_state(ctx->state, ctx->mode);
3362 }
3363
3364 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3365 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3366 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL)
3367
3368 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3369 {
3370         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3371         struct nfs4_server_caps_arg args = {
3372                 .fhandle = fhandle,
3373                 .bitmask = bitmask,
3374         };
3375         struct nfs4_server_caps_res res = {};
3376         struct rpc_message msg = {
3377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3378                 .rpc_argp = &args,
3379                 .rpc_resp = &res,
3380         };
3381         int status;
3382
3383         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3384                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3385                      FATTR4_WORD0_LINK_SUPPORT |
3386                      FATTR4_WORD0_SYMLINK_SUPPORT |
3387                      FATTR4_WORD0_ACLSUPPORT;
3388         if (minorversion)
3389                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3390
3391         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3392         if (status == 0) {
3393                 /* Sanity check the server answers */
3394                 switch (minorversion) {
3395                 case 0:
3396                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3397                         res.attr_bitmask[2] = 0;
3398                         break;
3399                 case 1:
3400                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3401                         break;
3402                 case 2:
3403                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3404                 }
3405                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3406                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3407                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3408                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3409                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3410                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3411                                 NFS_CAP_SECURITY_LABEL);
3412                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3413                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3414                         server->caps |= NFS_CAP_ACLS;
3415                 if (res.has_links != 0)
3416                         server->caps |= NFS_CAP_HARDLINKS;
3417                 if (res.has_symlinks != 0)
3418                         server->caps |= NFS_CAP_SYMLINKS;
3419                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3420                         server->caps |= NFS_CAP_FILEID;
3421                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3422                         server->caps |= NFS_CAP_MODE;
3423                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3424                         server->caps |= NFS_CAP_NLINK;
3425                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3426                         server->caps |= NFS_CAP_OWNER;
3427                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3428                         server->caps |= NFS_CAP_OWNER_GROUP;
3429                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3430                         server->caps |= NFS_CAP_ATIME;
3431                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3432                         server->caps |= NFS_CAP_CTIME;
3433                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3434                         server->caps |= NFS_CAP_MTIME;
3435 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3436                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3437                         server->caps |= NFS_CAP_SECURITY_LABEL;
3438 #endif
3439                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3440                                 sizeof(server->attr_bitmask));
3441                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3442
3443                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3444                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3445                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3446                 server->cache_consistency_bitmask[2] = 0;
3447                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3448                         sizeof(server->exclcreat_bitmask));
3449                 server->acl_bitmask = res.acl_bitmask;
3450                 server->fh_expire_type = res.fh_expire_type;
3451         }
3452
3453         return status;
3454 }
3455
3456 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3457 {
3458         struct nfs4_exception exception = { };
3459         int err;
3460         do {
3461                 err = nfs4_handle_exception(server,
3462                                 _nfs4_server_capabilities(server, fhandle),
3463                                 &exception);
3464         } while (exception.retry);
3465         return err;
3466 }
3467
3468 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3469                 struct nfs_fsinfo *info)
3470 {
3471         u32 bitmask[3];
3472         struct nfs4_lookup_root_arg args = {
3473                 .bitmask = bitmask,
3474         };
3475         struct nfs4_lookup_res res = {
3476                 .server = server,
3477                 .fattr = info->fattr,
3478                 .fh = fhandle,
3479         };
3480         struct rpc_message msg = {
3481                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3482                 .rpc_argp = &args,
3483                 .rpc_resp = &res,
3484         };
3485
3486         bitmask[0] = nfs4_fattr_bitmap[0];
3487         bitmask[1] = nfs4_fattr_bitmap[1];
3488         /*
3489          * Process the label in the upcoming getfattr
3490          */
3491         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3492
3493         nfs_fattr_init(info->fattr);
3494         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3495 }
3496
3497 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3498                 struct nfs_fsinfo *info)
3499 {
3500         struct nfs4_exception exception = { };
3501         int err;
3502         do {
3503                 err = _nfs4_lookup_root(server, fhandle, info);
3504                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3505                 switch (err) {
3506                 case 0:
3507                 case -NFS4ERR_WRONGSEC:
3508                         goto out;
3509                 default:
3510                         err = nfs4_handle_exception(server, err, &exception);
3511                 }
3512         } while (exception.retry);
3513 out:
3514         return err;
3515 }
3516
3517 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3518                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3519 {
3520         struct rpc_auth_create_args auth_args = {
3521                 .pseudoflavor = flavor,
3522         };
3523         struct rpc_auth *auth;
3524         int ret;
3525
3526         auth = rpcauth_create(&auth_args, server->client);
3527         if (IS_ERR(auth)) {
3528                 ret = -EACCES;
3529                 goto out;
3530         }
3531         ret = nfs4_lookup_root(server, fhandle, info);
3532 out:
3533         return ret;
3534 }
3535
3536 /*
3537  * Retry pseudoroot lookup with various security flavors.  We do this when:
3538  *
3539  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3540  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3541  *
3542  * Returns zero on success, or a negative NFS4ERR value, or a
3543  * negative errno value.
3544  */
3545 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3546                               struct nfs_fsinfo *info)
3547 {
3548         /* Per 3530bis 15.33.5 */
3549         static const rpc_authflavor_t flav_array[] = {
3550                 RPC_AUTH_GSS_KRB5P,
3551                 RPC_AUTH_GSS_KRB5I,
3552                 RPC_AUTH_GSS_KRB5,
3553                 RPC_AUTH_UNIX,                  /* courtesy */
3554                 RPC_AUTH_NULL,
3555         };
3556         int status = -EPERM;
3557         size_t i;
3558
3559         if (server->auth_info.flavor_len > 0) {
3560                 /* try each flavor specified by user */
3561                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3562                         status = nfs4_lookup_root_sec(server, fhandle, info,
3563                                                 server->auth_info.flavors[i]);
3564                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3565                                 continue;
3566                         break;
3567                 }
3568         } else {
3569                 /* no flavors specified by user, try default list */
3570                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3571                         status = nfs4_lookup_root_sec(server, fhandle, info,
3572                                                       flav_array[i]);
3573                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3574                                 continue;
3575                         break;
3576                 }
3577         }
3578
3579         /*
3580          * -EACCESS could mean that the user doesn't have correct permissions
3581          * to access the mount.  It could also mean that we tried to mount
3582          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3583          * existing mount programs don't handle -EACCES very well so it should
3584          * be mapped to -EPERM instead.
3585          */
3586         if (status == -EACCES)
3587                 status = -EPERM;
3588         return status;
3589 }
3590
3591 /**
3592  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3593  * @server: initialized nfs_server handle
3594  * @fhandle: we fill in the pseudo-fs root file handle
3595  * @info: we fill in an FSINFO struct
3596  * @auth_probe: probe the auth flavours
3597  *
3598  * Returns zero on success, or a negative errno.
3599  */
3600 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3601                          struct nfs_fsinfo *info,
3602                          bool auth_probe)
3603 {
3604         int status = 0;
3605
3606         if (!auth_probe)
3607                 status = nfs4_lookup_root(server, fhandle, info);
3608
3609         if (auth_probe || status == NFS4ERR_WRONGSEC)
3610                 status = server->nfs_client->cl_mvops->find_root_sec(server,
3611                                 fhandle, info);
3612
3613         if (status == 0)
3614                 status = nfs4_server_capabilities(server, fhandle);
3615         if (status == 0)
3616                 status = nfs4_do_fsinfo(server, fhandle, info);
3617
3618         return nfs4_map_errors(status);
3619 }
3620
3621 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3622                               struct nfs_fsinfo *info)
3623 {
3624         int error;
3625         struct nfs_fattr *fattr = info->fattr;
3626         struct nfs4_label *label = NULL;
3627
3628         error = nfs4_server_capabilities(server, mntfh);
3629         if (error < 0) {
3630                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3631                 return error;
3632         }
3633
3634         label = nfs4_label_alloc(server, GFP_KERNEL);
3635         if (IS_ERR(label))
3636                 return PTR_ERR(label);
3637
3638         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3639         if (error < 0) {
3640                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3641                 goto err_free_label;
3642         }
3643
3644         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3645             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3646                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3647
3648 err_free_label:
3649         nfs4_label_free(label);
3650
3651         return error;
3652 }
3653
3654 /*
3655  * Get locations and (maybe) other attributes of a referral.
3656  * Note that we'll actually follow the referral later when
3657  * we detect fsid mismatch in inode revalidation
3658  */
3659 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3660                              const struct qstr *name, struct nfs_fattr *fattr,
3661                              struct nfs_fh *fhandle)
3662 {
3663         int status = -ENOMEM;
3664         struct page *page = NULL;
3665         struct nfs4_fs_locations *locations = NULL;
3666
3667         page = alloc_page(GFP_KERNEL);
3668         if (page == NULL)
3669                 goto out;
3670         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3671         if (locations == NULL)
3672                 goto out;
3673
3674         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3675         if (status != 0)
3676                 goto out;
3677
3678         /*
3679          * If the fsid didn't change, this is a migration event, not a
3680          * referral.  Cause us to drop into the exception handler, which
3681          * will kick off migration recovery.
3682          */
3683         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3684                 dprintk("%s: server did not return a different fsid for"
3685                         " a referral at %s\n", __func__, name->name);
3686                 status = -NFS4ERR_MOVED;
3687                 goto out;
3688         }
3689         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3690         nfs_fixup_referral_attributes(&locations->fattr);
3691
3692         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3693         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3694         memset(fhandle, 0, sizeof(struct nfs_fh));
3695 out:
3696         if (page)
3697                 __free_page(page);
3698         kfree(locations);
3699         return status;
3700 }
3701
3702 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3703                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3704 {
3705         struct nfs4_getattr_arg args = {
3706                 .fh = fhandle,
3707                 .bitmask = server->attr_bitmask,
3708         };
3709         struct nfs4_getattr_res res = {
3710                 .fattr = fattr,
3711                 .label = label,
3712                 .server = server,
3713         };
3714         struct rpc_message msg = {
3715                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3716                 .rpc_argp = &args,
3717                 .rpc_resp = &res,
3718         };
3719
3720         args.bitmask = nfs4_bitmask(server, label);
3721
3722         nfs_fattr_init(fattr);
3723         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3724 }
3725
3726 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3727                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3728 {
3729         struct nfs4_exception exception = { };
3730         int err;
3731         do {
3732                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3733                 trace_nfs4_getattr(server, fhandle, fattr, err);
3734                 err = nfs4_handle_exception(server, err,
3735                                 &exception);
3736         } while (exception.retry);
3737         return err;
3738 }
3739
3740 /*
3741  * The file is not closed if it is opened due to the a request to change
3742  * the size of the file. The open call will not be needed once the
3743  * VFS layer lookup-intents are implemented.
3744  *
3745  * Close is called when the inode is destroyed.
3746  * If we haven't opened the file for O_WRONLY, we
3747  * need to in the size_change case to obtain a stateid.
3748  *
3749  * Got race?
3750  * Because OPEN is always done by name in nfsv4, it is
3751  * possible that we opened a different file by the same
3752  * name.  We can recognize this race condition, but we
3753  * can't do anything about it besides returning an error.
3754  *
3755  * This will be fixed with VFS changes (lookup-intent).
3756  */
3757 static int
3758 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3759                   struct iattr *sattr)
3760 {
3761         struct inode *inode = d_inode(dentry);
3762         struct rpc_cred *cred = NULL;
3763         struct nfs_open_context *ctx = NULL;
3764         struct nfs4_label *label = NULL;
3765         int status;
3766
3767         if (pnfs_ld_layoutret_on_setattr(inode) &&
3768             sattr->ia_valid & ATTR_SIZE &&
3769             sattr->ia_size < i_size_read(inode))
3770                 pnfs_commit_and_return_layout(inode);
3771
3772         nfs_fattr_init(fattr);
3773
3774         /* Deal with open(O_TRUNC) */
3775         if (sattr->ia_valid & ATTR_OPEN)
3776                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3777
3778         /* Optimization: if the end result is no change, don't RPC */
3779         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3780                 return 0;
3781
3782         /* Search for an existing open(O_WRITE) file */
3783         if (sattr->ia_valid & ATTR_FILE) {
3784
3785                 ctx = nfs_file_open_context(sattr->ia_file);
3786                 if (ctx)
3787                         cred = ctx->cred;
3788         }
3789
3790         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3791         if (IS_ERR(label))
3792                 return PTR_ERR(label);
3793
3794         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
3795         if (status == 0) {
3796                 nfs_setattr_update_inode(inode, sattr, fattr);
3797                 nfs_setsecurity(inode, fattr, label);
3798         }
3799         nfs4_label_free(label);
3800         return status;
3801 }
3802
3803 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3804                 const struct qstr *name, struct nfs_fh *fhandle,
3805                 struct nfs_fattr *fattr, struct nfs4_label *label)
3806 {
3807         struct nfs_server *server = NFS_SERVER(dir);
3808         int                    status;
3809         struct nfs4_lookup_arg args = {
3810                 .bitmask = server->attr_bitmask,
3811                 .dir_fh = NFS_FH(dir),
3812                 .name = name,
3813         };
3814         struct nfs4_lookup_res res = {
3815                 .server = server,
3816                 .fattr = fattr,
3817                 .label = label,
3818                 .fh = fhandle,
3819         };
3820         struct rpc_message msg = {
3821                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3822                 .rpc_argp = &args,
3823                 .rpc_resp = &res,
3824         };
3825
3826         args.bitmask = nfs4_bitmask(server, label);
3827
3828         nfs_fattr_init(fattr);
3829
3830         dprintk("NFS call  lookup %s\n", name->name);
3831         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3832         dprintk("NFS reply lookup: %d\n", status);
3833         return status;
3834 }
3835
3836 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3837 {
3838         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3839                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3840         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3841         fattr->nlink = 2;
3842 }
3843
3844 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3845                                    const struct qstr *name, struct nfs_fh *fhandle,
3846                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3847 {
3848         struct nfs4_exception exception = { };
3849         struct rpc_clnt *client = *clnt;
3850         int err;
3851         do {
3852                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3853                 trace_nfs4_lookup(dir, name, err);
3854                 switch (err) {
3855                 case -NFS4ERR_BADNAME:
3856                         err = -ENOENT;
3857                         goto out;
3858                 case -NFS4ERR_MOVED:
3859                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3860                         if (err == -NFS4ERR_MOVED)
3861                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3862                         goto out;
3863                 case -NFS4ERR_WRONGSEC:
3864                         err = -EPERM;
3865                         if (client != *clnt)
3866                                 goto out;
3867                         client = nfs4_negotiate_security(client, dir, name);
3868                         if (IS_ERR(client))
3869                                 return PTR_ERR(client);
3870
3871                         exception.retry = 1;
3872                         break;
3873                 default:
3874                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3875                 }
3876         } while (exception.retry);
3877
3878 out:
3879         if (err == 0)
3880                 *clnt = client;
3881         else if (client != *clnt)
3882                 rpc_shutdown_client(client);
3883
3884         return err;
3885 }
3886
3887 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
3888                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3889                             struct nfs4_label *label)
3890 {
3891         int status;
3892         struct rpc_clnt *client = NFS_CLIENT(dir);
3893
3894         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3895         if (client != NFS_CLIENT(dir)) {
3896                 rpc_shutdown_client(client);
3897                 nfs_fixup_secinfo_attributes(fattr);
3898         }
3899         return status;
3900 }
3901
3902 struct rpc_clnt *
3903 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name,
3904                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3905 {
3906         struct rpc_clnt *client = NFS_CLIENT(dir);
3907         int status;
3908
3909         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3910         if (status < 0)
3911                 return ERR_PTR(status);
3912         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3913 }
3914
3915 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3916 {
3917         struct nfs_server *server = NFS_SERVER(inode);
3918         struct nfs4_accessargs args = {
3919                 .fh = NFS_FH(inode),
3920                 .bitmask = server->cache_consistency_bitmask,
3921         };
3922         struct nfs4_accessres res = {
3923                 .server = server,
3924         };
3925         struct rpc_message msg = {
3926                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3927                 .rpc_argp = &args,
3928                 .rpc_resp = &res,
3929                 .rpc_cred = entry->cred,
3930         };
3931         int mode = entry->mask;
3932         int status = 0;
3933
3934         /*
3935          * Determine which access bits we want to ask for...
3936          */
3937         if (mode & MAY_READ)
3938                 args.access |= NFS4_ACCESS_READ;
3939         if (S_ISDIR(inode->i_mode)) {
3940                 if (mode & MAY_WRITE)
3941                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3942                 if (mode & MAY_EXEC)
3943                         args.access |= NFS4_ACCESS_LOOKUP;
3944         } else {
3945                 if (mode & MAY_WRITE)
3946                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3947                 if (mode & MAY_EXEC)
3948                         args.access |= NFS4_ACCESS_EXECUTE;
3949         }
3950
3951         res.fattr = nfs_alloc_fattr();
3952         if (res.fattr == NULL)
3953                 return -ENOMEM;
3954
3955         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3956         if (!status) {
3957                 nfs_access_set_mask(entry, res.access);
3958                 nfs_refresh_inode(inode, res.fattr);
3959         }
3960         nfs_free_fattr(res.fattr);
3961         return status;
3962 }
3963
3964 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3965 {
3966         struct nfs4_exception exception = { };
3967         int err;
3968         do {
3969                 err = _nfs4_proc_access(inode, entry);
3970                 trace_nfs4_access(inode, err);
3971                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3972                                 &exception);
3973         } while (exception.retry);
3974         return err;
3975 }
3976
3977 /*
3978  * TODO: For the time being, we don't try to get any attributes
3979  * along with any of the zero-copy operations READ, READDIR,
3980  * READLINK, WRITE.
3981  *
3982  * In the case of the first three, we want to put the GETATTR
3983  * after the read-type operation -- this is because it is hard
3984  * to predict the length of a GETATTR response in v4, and thus
3985  * align the READ data correctly.  This means that the GETATTR
3986  * may end up partially falling into the page cache, and we should
3987  * shift it into the 'tail' of the xdr_buf before processing.
3988  * To do this efficiently, we need to know the total length
3989  * of data received, which doesn't seem to be available outside
3990  * of the RPC layer.
3991  *
3992  * In the case of WRITE, we also want to put the GETATTR after
3993  * the operation -- in this case because we want to make sure
3994  * we get the post-operation mtime and size.
3995  *
3996  * Both of these changes to the XDR layer would in fact be quite
3997  * minor, but I decided to leave them for a subsequent patch.
3998  */
3999 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4000                 unsigned int pgbase, unsigned int pglen)
4001 {
4002         struct nfs4_readlink args = {
4003                 .fh       = NFS_FH(inode),
4004                 .pgbase   = pgbase,
4005                 .pglen    = pglen,
4006                 .pages    = &page,
4007         };
4008         struct nfs4_readlink_res res;
4009         struct rpc_message msg = {
4010                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4011                 .rpc_argp = &args,
4012                 .rpc_resp = &res,
4013         };
4014
4015         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4016 }
4017
4018 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4019                 unsigned int pgbase, unsigned int pglen)
4020 {
4021         struct nfs4_exception exception = { };
4022         int err;
4023         do {
4024                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4025                 trace_nfs4_readlink(inode, err);
4026                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4027                                 &exception);
4028         } while (exception.retry);
4029         return err;
4030 }
4031
4032 /*
4033  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4034  */
4035 static int
4036 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4037                  int flags)
4038 {
4039         struct nfs_server *server = NFS_SERVER(dir);
4040         struct nfs4_label l, *ilabel = NULL;
4041         struct nfs_open_context *ctx;
4042         struct nfs4_state *state;
4043         int status = 0;
4044
4045         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4046         if (IS_ERR(ctx))
4047                 return PTR_ERR(ctx);
4048
4049         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4050
4051         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4052                 sattr->ia_mode &= ~current_umask();
4053         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4054         if (IS_ERR(state)) {
4055                 status = PTR_ERR(state);
4056                 goto out;
4057         }
4058 out:
4059         nfs4_label_release_security(ilabel);
4060         put_nfs_open_context(ctx);
4061         return status;
4062 }
4063
4064 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name)
4065 {
4066         struct nfs_server *server = NFS_SERVER(dir);
4067         struct nfs_removeargs args = {
4068                 .fh = NFS_FH(dir),
4069                 .name = *name,
4070         };
4071         struct nfs_removeres res = {
4072                 .server = server,
4073         };
4074         struct rpc_message msg = {
4075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4076                 .rpc_argp = &args,
4077                 .rpc_resp = &res,
4078         };
4079         unsigned long timestamp = jiffies;
4080         int status;
4081
4082         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4083         if (status == 0)
4084                 update_changeattr(dir, &res.cinfo, timestamp);
4085         return status;
4086 }
4087
4088 static int nfs4_proc_remove(struct inode *dir, const struct qstr *name)
4089 {
4090         struct nfs4_exception exception = { };
4091         int err;
4092         do {
4093                 err = _nfs4_proc_remove(dir, name);
4094                 trace_nfs4_remove(dir, name, err);
4095                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4096                                 &exception);
4097         } while (exception.retry);
4098         return err;
4099 }
4100
4101 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
4102 {
4103         struct nfs_server *server = NFS_SERVER(dir);
4104         struct nfs_removeargs *args = msg->rpc_argp;
4105         struct nfs_removeres *res = msg->rpc_resp;
4106
4107         res->server = server;
4108         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4109         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
4110
4111         nfs_fattr_init(res->dir_attr);
4112 }
4113
4114 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4115 {
4116         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4117                         &data->args.seq_args,
4118                         &data->res.seq_res,
4119                         task);
4120 }
4121
4122 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4123 {
4124         struct nfs_unlinkdata *data = task->tk_calldata;
4125         struct nfs_removeres *res = &data->res;
4126
4127         if (!nfs4_sequence_done(task, &res->seq_res))
4128                 return 0;
4129         if (nfs4_async_handle_error(task, res->server, NULL,
4130                                     &data->timeout) == -EAGAIN)
4131                 return 0;
4132         if (task->tk_status == 0)
4133                 update_changeattr(dir, &res->cinfo, res->dir_attr->time_start);
4134         return 1;
4135 }
4136
4137 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
4138 {
4139         struct nfs_server *server = NFS_SERVER(dir);
4140         struct nfs_renameargs *arg = msg->rpc_argp;
4141         struct nfs_renameres *res = msg->rpc_resp;
4142
4143         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4144         res->server = server;
4145         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
4146 }
4147
4148 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4149 {
4150         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4151                         &data->args.seq_args,
4152                         &data->res.seq_res,
4153                         task);
4154 }
4155
4156 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4157                                  struct inode *new_dir)
4158 {
4159         struct nfs_renamedata *data = task->tk_calldata;
4160         struct nfs_renameres *res = &data->res;
4161
4162         if (!nfs4_sequence_done(task, &res->seq_res))
4163                 return 0;
4164         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4165                 return 0;
4166
4167         if (task->tk_status == 0) {
4168                 update_changeattr(old_dir, &res->old_cinfo, res->old_fattr->time_start);
4169                 if (new_dir != old_dir)
4170                         update_changeattr(new_dir, &res->new_cinfo, res->new_fattr->time_start);
4171         }
4172         return 1;
4173 }
4174
4175 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4176 {
4177         struct nfs_server *server = NFS_SERVER(inode);
4178         struct nfs4_link_arg arg = {
4179                 .fh     = NFS_FH(inode),
4180                 .dir_fh = NFS_FH(dir),
4181                 .name   = name,
4182                 .bitmask = server->attr_bitmask,
4183         };
4184         struct nfs4_link_res res = {
4185                 .server = server,
4186                 .label = NULL,
4187         };
4188         struct rpc_message msg = {
4189                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4190                 .rpc_argp = &arg,
4191                 .rpc_resp = &res,
4192         };
4193         int status = -ENOMEM;
4194
4195         res.fattr = nfs_alloc_fattr();
4196         if (res.fattr == NULL)
4197                 goto out;
4198
4199         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4200         if (IS_ERR(res.label)) {
4201                 status = PTR_ERR(res.label);
4202                 goto out;
4203         }
4204         arg.bitmask = nfs4_bitmask(server, res.label);
4205
4206         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4207         if (!status) {
4208                 update_changeattr(dir, &res.cinfo, res.fattr->time_start);
4209                 status = nfs_post_op_update_inode(inode, res.fattr);
4210                 if (!status)
4211                         nfs_setsecurity(inode, res.fattr, res.label);
4212         }
4213
4214
4215         nfs4_label_free(res.label);
4216
4217 out:
4218         nfs_free_fattr(res.fattr);
4219         return status;
4220 }
4221
4222 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4223 {
4224         struct nfs4_exception exception = { };
4225         int err;
4226         do {
4227                 err = nfs4_handle_exception(NFS_SERVER(inode),
4228                                 _nfs4_proc_link(inode, dir, name),
4229                                 &exception);
4230         } while (exception.retry);
4231         return err;
4232 }
4233
4234 struct nfs4_createdata {
4235         struct rpc_message msg;
4236         struct nfs4_create_arg arg;
4237         struct nfs4_create_res res;
4238         struct nfs_fh fh;
4239         struct nfs_fattr fattr;
4240         struct nfs4_label *label;
4241 };
4242
4243 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4244                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4245 {
4246         struct nfs4_createdata *data;
4247
4248         data = kzalloc(sizeof(*data), GFP_KERNEL);
4249         if (data != NULL) {
4250                 struct nfs_server *server = NFS_SERVER(dir);
4251
4252                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4253                 if (IS_ERR(data->label))
4254                         goto out_free;
4255
4256                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4257                 data->msg.rpc_argp = &data->arg;
4258                 data->msg.rpc_resp = &data->res;
4259                 data->arg.dir_fh = NFS_FH(dir);
4260                 data->arg.server = server;
4261                 data->arg.name = name;
4262                 data->arg.attrs = sattr;
4263                 data->arg.ftype = ftype;
4264                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4265                 data->arg.umask = current_umask();
4266                 data->res.server = server;
4267                 data->res.fh = &data->fh;
4268                 data->res.fattr = &data->fattr;
4269                 data->res.label = data->label;
4270                 nfs_fattr_init(data->res.fattr);
4271         }
4272         return data;
4273 out_free:
4274         kfree(data);
4275         return NULL;
4276 }
4277
4278 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4279 {
4280         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4281                                     &data->arg.seq_args, &data->res.seq_res, 1);
4282         if (status == 0) {
4283                 update_changeattr(dir, &data->res.dir_cinfo,
4284                                 data->res.fattr->time_start);
4285                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4286         }
4287         return status;
4288 }
4289
4290 static void nfs4_free_createdata(struct nfs4_createdata *data)
4291 {
4292         nfs4_label_free(data->label);
4293         kfree(data);
4294 }
4295
4296 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4297                 struct page *page, unsigned int len, struct iattr *sattr,
4298                 struct nfs4_label *label)
4299 {
4300         struct nfs4_createdata *data;
4301         int status = -ENAMETOOLONG;
4302
4303         if (len > NFS4_MAXPATHLEN)
4304                 goto out;
4305
4306         status = -ENOMEM;
4307         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4308         if (data == NULL)
4309                 goto out;
4310
4311         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4312         data->arg.u.symlink.pages = &page;
4313         data->arg.u.symlink.len = len;
4314         data->arg.label = label;
4315
4316         status = nfs4_do_create(dir, dentry, data);
4317
4318         nfs4_free_createdata(data);
4319 out:
4320         return status;
4321 }
4322
4323 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4324                 struct page *page, unsigned int len, struct iattr *sattr)
4325 {
4326         struct nfs4_exception exception = { };
4327         struct nfs4_label l, *label = NULL;
4328         int err;
4329
4330         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4331
4332         do {
4333                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4334                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4335                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4336                                 &exception);
4337         } while (exception.retry);
4338
4339         nfs4_label_release_security(label);
4340         return err;
4341 }
4342
4343 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4344                 struct iattr *sattr, struct nfs4_label *label)
4345 {
4346         struct nfs4_createdata *data;
4347         int status = -ENOMEM;
4348
4349         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4350         if (data == NULL)
4351                 goto out;
4352
4353         data->arg.label = label;
4354         status = nfs4_do_create(dir, dentry, data);
4355
4356         nfs4_free_createdata(data);
4357 out:
4358         return status;
4359 }
4360
4361 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4362                 struct iattr *sattr)
4363 {
4364         struct nfs_server *server = NFS_SERVER(dir);
4365         struct nfs4_exception exception = { };
4366         struct nfs4_label l, *label = NULL;
4367         int err;
4368
4369         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4370
4371         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4372                 sattr->ia_mode &= ~current_umask();
4373         do {
4374                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4375                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4376                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4377                                 &exception);
4378         } while (exception.retry);
4379         nfs4_label_release_security(label);
4380
4381         return err;
4382 }
4383
4384 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4385                 u64 cookie, struct page **pages, unsigned int count, int plus)
4386 {
4387         struct inode            *dir = d_inode(dentry);
4388         struct nfs4_readdir_arg args = {
4389                 .fh = NFS_FH(dir),
4390                 .pages = pages,
4391                 .pgbase = 0,
4392                 .count = count,
4393                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4394                 .plus = plus,
4395         };
4396         struct nfs4_readdir_res res;
4397         struct rpc_message msg = {
4398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4399                 .rpc_argp = &args,
4400                 .rpc_resp = &res,
4401                 .rpc_cred = cred,
4402         };
4403         int                     status;
4404
4405         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4406                         dentry,
4407                         (unsigned long long)cookie);
4408         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4409         res.pgbase = args.pgbase;
4410         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4411         if (status >= 0) {
4412                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4413                 status += args.pgbase;
4414         }
4415
4416         nfs_invalidate_atime(dir);
4417
4418         dprintk("%s: returns %d\n", __func__, status);
4419         return status;
4420 }
4421
4422 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4423                 u64 cookie, struct page **pages, unsigned int count, int plus)
4424 {
4425         struct nfs4_exception exception = { };
4426         int err;
4427         do {
4428                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4429                                 pages, count, plus);
4430                 trace_nfs4_readdir(d_inode(dentry), err);
4431                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4432                                 &exception);
4433         } while (exception.retry);
4434         return err;
4435 }
4436
4437 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4438                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4439 {
4440         struct nfs4_createdata *data;
4441         int mode = sattr->ia_mode;
4442         int status = -ENOMEM;
4443
4444         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4445         if (data == NULL)
4446                 goto out;
4447
4448         if (S_ISFIFO(mode))
4449                 data->arg.ftype = NF4FIFO;
4450         else if (S_ISBLK(mode)) {
4451                 data->arg.ftype = NF4BLK;
4452                 data->arg.u.device.specdata1 = MAJOR(rdev);
4453                 data->arg.u.device.specdata2 = MINOR(rdev);
4454         }
4455         else if (S_ISCHR(mode)) {
4456                 data->arg.ftype = NF4CHR;
4457                 data->arg.u.device.specdata1 = MAJOR(rdev);
4458                 data->arg.u.device.specdata2 = MINOR(rdev);
4459         } else if (!S_ISSOCK(mode)) {
4460                 status = -EINVAL;
4461                 goto out_free;
4462         }
4463
4464         data->arg.label = label;
4465         status = nfs4_do_create(dir, dentry, data);
4466 out_free:
4467         nfs4_free_createdata(data);
4468 out:
4469         return status;
4470 }
4471
4472 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4473                 struct iattr *sattr, dev_t rdev)
4474 {
4475         struct nfs_server *server = NFS_SERVER(dir);
4476         struct nfs4_exception exception = { };
4477         struct nfs4_label l, *label = NULL;
4478         int err;
4479
4480         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4481
4482         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4483                 sattr->ia_mode &= ~current_umask();
4484         do {
4485                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4486                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4487                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4488                                 &exception);
4489         } while (exception.retry);
4490
4491         nfs4_label_release_security(label);
4492
4493         return err;
4494 }
4495
4496 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4497                  struct nfs_fsstat *fsstat)
4498 {
4499         struct nfs4_statfs_arg args = {
4500                 .fh = fhandle,
4501                 .bitmask = server->attr_bitmask,
4502         };
4503         struct nfs4_statfs_res res = {
4504                 .fsstat = fsstat,
4505         };
4506         struct rpc_message msg = {
4507                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4508                 .rpc_argp = &args,
4509                 .rpc_resp = &res,
4510         };
4511
4512         nfs_fattr_init(fsstat->fattr);
4513         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4514 }
4515
4516 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4517 {
4518         struct nfs4_exception exception = { };
4519         int err;
4520         do {
4521                 err = nfs4_handle_exception(server,
4522                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4523                                 &exception);
4524         } while (exception.retry);
4525         return err;
4526 }
4527
4528 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4529                 struct nfs_fsinfo *fsinfo)
4530 {
4531         struct nfs4_fsinfo_arg args = {
4532                 .fh = fhandle,
4533                 .bitmask = server->attr_bitmask,
4534         };
4535         struct nfs4_fsinfo_res res = {
4536                 .fsinfo = fsinfo,
4537         };
4538         struct rpc_message msg = {
4539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4540                 .rpc_argp = &args,
4541                 .rpc_resp = &res,
4542         };
4543
4544         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4545 }
4546
4547 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4548 {
4549         struct nfs4_exception exception = { };
4550         unsigned long now = jiffies;
4551         int err;
4552
4553         do {
4554                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4555                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4556                 if (err == 0) {
4557                         nfs4_set_lease_period(server->nfs_client,
4558                                         fsinfo->lease_time * HZ,
4559                                         now);
4560                         break;
4561                 }
4562                 err = nfs4_handle_exception(server, err, &exception);
4563         } while (exception.retry);
4564         return err;
4565 }
4566
4567 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4568 {
4569         int error;
4570
4571         nfs_fattr_init(fsinfo->fattr);
4572         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4573         if (error == 0) {
4574                 /* block layout checks this! */
4575                 server->pnfs_blksize = fsinfo->blksize;
4576                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
4577         }
4578
4579         return error;
4580 }
4581
4582 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4583                 struct nfs_pathconf *pathconf)
4584 {
4585         struct nfs4_pathconf_arg args = {
4586                 .fh = fhandle,
4587                 .bitmask = server->attr_bitmask,
4588         };
4589         struct nfs4_pathconf_res res = {
4590                 .pathconf = pathconf,
4591         };
4592         struct rpc_message msg = {
4593                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4594                 .rpc_argp = &args,
4595                 .rpc_resp = &res,
4596         };
4597
4598         /* None of the pathconf attributes are mandatory to implement */
4599         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4600                 memset(pathconf, 0, sizeof(*pathconf));
4601                 return 0;
4602         }
4603
4604         nfs_fattr_init(pathconf->fattr);
4605         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4606 }
4607
4608 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4609                 struct nfs_pathconf *pathconf)
4610 {
4611         struct nfs4_exception exception = { };
4612         int err;
4613
4614         do {
4615                 err = nfs4_handle_exception(server,
4616                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4617                                 &exception);
4618         } while (exception.retry);
4619         return err;
4620 }
4621
4622 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4623                 const struct nfs_open_context *ctx,
4624                 const struct nfs_lock_context *l_ctx,
4625                 fmode_t fmode)
4626 {
4627         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
4628 }
4629 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4630
4631 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4632                 const struct nfs_open_context *ctx,
4633                 const struct nfs_lock_context *l_ctx,
4634                 fmode_t fmode)
4635 {
4636         nfs4_stateid current_stateid;
4637
4638         /* If the current stateid represents a lost lock, then exit */
4639         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4640                 return true;
4641         return nfs4_stateid_match(stateid, &current_stateid);
4642 }
4643
4644 static bool nfs4_error_stateid_expired(int err)
4645 {
4646         switch (err) {
4647         case -NFS4ERR_DELEG_REVOKED:
4648         case -NFS4ERR_ADMIN_REVOKED:
4649         case -NFS4ERR_BAD_STATEID:
4650         case -NFS4ERR_STALE_STATEID:
4651         case -NFS4ERR_OLD_STATEID:
4652         case -NFS4ERR_OPENMODE:
4653         case -NFS4ERR_EXPIRED:
4654                 return true;
4655         }
4656         return false;
4657 }
4658
4659 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4660 {
4661         struct nfs_server *server = NFS_SERVER(hdr->inode);
4662
4663         trace_nfs4_read(hdr, task->tk_status);
4664         if (task->tk_status < 0) {
4665                 struct nfs4_exception exception = {
4666                         .inode = hdr->inode,
4667                         .state = hdr->args.context->state,
4668                         .stateid = &hdr->args.stateid,
4669                 };
4670                 task->tk_status = nfs4_async_handle_exception(task,
4671                                 server, task->tk_status, &exception);
4672                 if (exception.retry) {
4673                         rpc_restart_call_prepare(task);
4674                         return -EAGAIN;
4675                 }
4676         }
4677
4678         if (task->tk_status > 0)
4679                 renew_lease(server, hdr->timestamp);
4680         return 0;
4681 }
4682
4683 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4684                 struct nfs_pgio_args *args)
4685 {
4686
4687         if (!nfs4_error_stateid_expired(task->tk_status) ||
4688                 nfs4_stateid_is_current(&args->stateid,
4689                                 args->context,
4690                                 args->lock_context,
4691                                 FMODE_READ))
4692                 return false;
4693         rpc_restart_call_prepare(task);
4694         return true;
4695 }
4696
4697 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4698 {
4699
4700         dprintk("--> %s\n", __func__);
4701
4702         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4703                 return -EAGAIN;
4704         if (nfs4_read_stateid_changed(task, &hdr->args))
4705                 return -EAGAIN;
4706         if (task->tk_status > 0)
4707                 nfs_invalidate_atime(hdr->inode);
4708         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4709                                     nfs4_read_done_cb(task, hdr);
4710 }
4711
4712 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4713                                  struct rpc_message *msg)
4714 {
4715         hdr->timestamp   = jiffies;
4716         if (!hdr->pgio_done_cb)
4717                 hdr->pgio_done_cb = nfs4_read_done_cb;
4718         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4719         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4720 }
4721
4722 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4723                                       struct nfs_pgio_header *hdr)
4724 {
4725         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
4726                         &hdr->args.seq_args,
4727                         &hdr->res.seq_res,
4728                         task))
4729                 return 0;
4730         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4731                                 hdr->args.lock_context,
4732                                 hdr->rw_ops->rw_mode) == -EIO)
4733                 return -EIO;
4734         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4735                 return -EIO;
4736         return 0;
4737 }
4738
4739 static int nfs4_write_done_cb(struct rpc_task *task,
4740                               struct nfs_pgio_header *hdr)
4741 {
4742         struct inode *inode = hdr->inode;
4743
4744         trace_nfs4_write(hdr, task->tk_status);
4745         if (task->tk_status < 0) {
4746                 struct nfs4_exception exception = {
4747                         .inode = hdr->inode,
4748                         .state = hdr->args.context->state,
4749                         .stateid = &hdr->args.stateid,
4750                 };
4751                 task->tk_status = nfs4_async_handle_exception(task,
4752                                 NFS_SERVER(inode), task->tk_status,
4753                                 &exception);
4754                 if (exception.retry) {
4755                         rpc_restart_call_prepare(task);
4756                         return -EAGAIN;
4757                 }
4758         }
4759         if (task->tk_status >= 0) {
4760                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4761                 nfs_writeback_update_inode(hdr);
4762         }
4763         return 0;
4764 }
4765
4766 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4767                 struct nfs_pgio_args *args)
4768 {
4769
4770         if (!nfs4_error_stateid_expired(task->tk_status) ||
4771                 nfs4_stateid_is_current(&args->stateid,
4772                                 args->context,
4773                                 args->lock_context,
4774                                 FMODE_WRITE))
4775                 return false;
4776         rpc_restart_call_prepare(task);
4777         return true;
4778 }
4779
4780 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4781 {
4782         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4783                 return -EAGAIN;
4784         if (nfs4_write_stateid_changed(task, &hdr->args))
4785                 return -EAGAIN;
4786         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4787                 nfs4_write_done_cb(task, hdr);
4788 }
4789
4790 static
4791 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4792 {
4793         /* Don't request attributes for pNFS or O_DIRECT writes */
4794         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4795                 return false;
4796         /* Otherwise, request attributes if and only if we don't hold
4797          * a delegation
4798          */
4799         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4800 }
4801
4802 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4803                                   struct rpc_message *msg)
4804 {
4805         struct nfs_server *server = NFS_SERVER(hdr->inode);
4806
4807         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4808                 hdr->args.bitmask = NULL;
4809                 hdr->res.fattr = NULL;
4810         } else
4811                 hdr->args.bitmask = server->cache_consistency_bitmask;
4812
4813         if (!hdr->pgio_done_cb)
4814                 hdr->pgio_done_cb = nfs4_write_done_cb;
4815         hdr->res.server = server;
4816         hdr->timestamp   = jiffies;
4817
4818         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4819         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4820 }
4821
4822 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4823 {
4824         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
4825                         &data->args.seq_args,
4826                         &data->res.seq_res,
4827                         task);
4828 }
4829
4830 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4831 {
4832         struct inode *inode = data->inode;
4833
4834         trace_nfs4_commit(data, task->tk_status);
4835         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4836                                     NULL, NULL) == -EAGAIN) {
4837                 rpc_restart_call_prepare(task);
4838                 return -EAGAIN;
4839         }
4840         return 0;
4841 }
4842
4843 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4844 {
4845         if (!nfs4_sequence_done(task, &data->res.seq_res))
4846                 return -EAGAIN;
4847         return data->commit_done_cb(task, data);
4848 }
4849
4850 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4851 {
4852         struct nfs_server *server = NFS_SERVER(data->inode);
4853
4854         if (data->commit_done_cb == NULL)
4855                 data->commit_done_cb = nfs4_commit_done_cb;
4856         data->res.server = server;
4857         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4858         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4859 }
4860
4861 struct nfs4_renewdata {
4862         struct nfs_client       *client;
4863         unsigned long           timestamp;
4864 };
4865
4866 /*
4867  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4868  * standalone procedure for queueing an asynchronous RENEW.
4869  */
4870 static void nfs4_renew_release(void *calldata)
4871 {
4872         struct nfs4_renewdata *data = calldata;
4873         struct nfs_client *clp = data->client;
4874
4875         if (atomic_read(&clp->cl_count) > 1)
4876                 nfs4_schedule_state_renewal(clp);
4877         nfs_put_client(clp);
4878         kfree(data);
4879 }
4880
4881 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4882 {
4883         struct nfs4_renewdata *data = calldata;
4884         struct nfs_client *clp = data->client;
4885         unsigned long timestamp = data->timestamp;
4886
4887         trace_nfs4_renew_async(clp, task->tk_status);
4888         switch (task->tk_status) {
4889         case 0:
4890                 break;
4891         case -NFS4ERR_LEASE_MOVED:
4892                 nfs4_schedule_lease_moved_recovery(clp);
4893                 break;
4894         default:
4895                 /* Unless we're shutting down, schedule state recovery! */
4896                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4897                         return;
4898                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4899                         nfs4_schedule_lease_recovery(clp);
4900                         return;
4901                 }
4902                 nfs4_schedule_path_down_recovery(clp);
4903         }
4904         do_renew_lease(clp, timestamp);
4905 }
4906
4907 static const struct rpc_call_ops nfs4_renew_ops = {
4908         .rpc_call_done = nfs4_renew_done,
4909         .rpc_release = nfs4_renew_release,
4910 };
4911
4912 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4913 {
4914         struct rpc_message msg = {
4915                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4916                 .rpc_argp       = clp,
4917                 .rpc_cred       = cred,
4918         };
4919         struct nfs4_renewdata *data;
4920
4921         if (renew_flags == 0)
4922                 return 0;
4923         if (!atomic_inc_not_zero(&clp->cl_count))
4924                 return -EIO;
4925         data = kmalloc(sizeof(*data), GFP_NOFS);
4926         if (data == NULL)
4927                 return -ENOMEM;
4928         data->client = clp;
4929         data->timestamp = jiffies;
4930         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4931                         &nfs4_renew_ops, data);
4932 }
4933
4934 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4935 {
4936         struct rpc_message msg = {
4937                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4938                 .rpc_argp       = clp,
4939                 .rpc_cred       = cred,
4940         };
4941         unsigned long now = jiffies;
4942         int status;
4943
4944         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4945         if (status < 0)
4946                 return status;
4947         do_renew_lease(clp, now);
4948         return 0;
4949 }
4950
4951 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4952 {
4953         return server->caps & NFS_CAP_ACLS;
4954 }
4955
4956 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4957  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4958  * the stack.
4959  */
4960 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4961
4962 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4963                 struct page **pages)
4964 {
4965         struct page *newpage, **spages;
4966         int rc = 0;
4967         size_t len;
4968         spages = pages;
4969
4970         do {
4971                 len = min_t(size_t, PAGE_SIZE, buflen);
4972                 newpage = alloc_page(GFP_KERNEL);
4973
4974                 if (newpage == NULL)
4975                         goto unwind;
4976                 memcpy(page_address(newpage), buf, len);
4977                 buf += len;
4978                 buflen -= len;
4979                 *pages++ = newpage;
4980                 rc++;
4981         } while (buflen != 0);
4982
4983         return rc;
4984
4985 unwind:
4986         for(; rc > 0; rc--)
4987                 __free_page(spages[rc-1]);
4988         return -ENOMEM;
4989 }
4990
4991 struct nfs4_cached_acl {
4992         int cached;
4993         size_t len;
4994         char data[0];
4995 };
4996
4997 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4998 {
4999         struct nfs_inode *nfsi = NFS_I(inode);
5000
5001         spin_lock(&inode->i_lock);
5002         kfree(nfsi->nfs4_acl);
5003         nfsi->nfs4_acl = acl;
5004         spin_unlock(&inode->i_lock);
5005 }
5006
5007 static void nfs4_zap_acl_attr(struct inode *inode)
5008 {
5009         nfs4_set_cached_acl(inode, NULL);
5010 }
5011
5012 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5013 {
5014         struct nfs_inode *nfsi = NFS_I(inode);
5015         struct nfs4_cached_acl *acl;
5016         int ret = -ENOENT;
5017
5018         spin_lock(&inode->i_lock);
5019         acl = nfsi->nfs4_acl;
5020         if (acl == NULL)
5021                 goto out;
5022         if (buf == NULL) /* user is just asking for length */
5023                 goto out_len;
5024         if (acl->cached == 0)
5025                 goto out;
5026         ret = -ERANGE; /* see getxattr(2) man page */
5027         if (acl->len > buflen)
5028                 goto out;
5029         memcpy(buf, acl->data, acl->len);
5030 out_len:
5031         ret = acl->len;
5032 out:
5033         spin_unlock(&inode->i_lock);
5034         return ret;
5035 }
5036
5037 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5038 {
5039         struct nfs4_cached_acl *acl;
5040         size_t buflen = sizeof(*acl) + acl_len;
5041
5042         if (buflen <= PAGE_SIZE) {
5043                 acl = kmalloc(buflen, GFP_KERNEL);
5044                 if (acl == NULL)
5045                         goto out;
5046                 acl->cached = 1;
5047                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5048         } else {
5049                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5050                 if (acl == NULL)
5051                         goto out;
5052                 acl->cached = 0;
5053         }
5054         acl->len = acl_len;
5055 out:
5056         nfs4_set_cached_acl(inode, acl);
5057 }
5058
5059 /*
5060  * The getxattr API returns the required buffer length when called with a
5061  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5062  * the required buf.  On a NULL buf, we send a page of data to the server
5063  * guessing that the ACL request can be serviced by a page. If so, we cache
5064  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5065  * the cache. If not so, we throw away the page, and cache the required
5066  * length. The next getxattr call will then produce another round trip to
5067  * the server, this time with the input buf of the required size.
5068  */
5069 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5070 {
5071         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
5072         struct nfs_getaclargs args = {
5073                 .fh = NFS_FH(inode),
5074                 .acl_pages = pages,
5075                 .acl_len = buflen,
5076         };
5077         struct nfs_getaclres res = {
5078                 .acl_len = buflen,
5079         };
5080         struct rpc_message msg = {
5081                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5082                 .rpc_argp = &args,
5083                 .rpc_resp = &res,
5084         };
5085         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5086         int ret = -ENOMEM, i;
5087
5088         /* As long as we're doing a round trip to the server anyway,
5089          * let's be prepared for a page of acl data. */
5090         if (npages == 0)
5091                 npages = 1;
5092         if (npages > ARRAY_SIZE(pages))
5093                 return -ERANGE;
5094
5095         for (i = 0; i < npages; i++) {
5096                 pages[i] = alloc_page(GFP_KERNEL);
5097                 if (!pages[i])
5098                         goto out_free;
5099         }
5100
5101         /* for decoding across pages */
5102         res.acl_scratch = alloc_page(GFP_KERNEL);
5103         if (!res.acl_scratch)
5104                 goto out_free;
5105
5106         args.acl_len = npages * PAGE_SIZE;
5107
5108         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5109                 __func__, buf, buflen, npages, args.acl_len);
5110         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5111                              &msg, &args.seq_args, &res.seq_res, 0);
5112         if (ret)
5113                 goto out_free;
5114
5115         /* Handle the case where the passed-in buffer is too short */
5116         if (res.acl_flags & NFS4_ACL_TRUNC) {
5117                 /* Did the user only issue a request for the acl length? */
5118                 if (buf == NULL)
5119                         goto out_ok;
5120                 ret = -ERANGE;
5121                 goto out_free;
5122         }
5123         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5124         if (buf) {
5125                 if (res.acl_len > buflen) {
5126                         ret = -ERANGE;
5127                         goto out_free;
5128                 }
5129                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5130         }
5131 out_ok:
5132         ret = res.acl_len;
5133 out_free:
5134         for (i = 0; i < npages; i++)
5135                 if (pages[i])
5136                         __free_page(pages[i]);
5137         if (res.acl_scratch)
5138                 __free_page(res.acl_scratch);
5139         return ret;
5140 }
5141
5142 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5143 {
5144         struct nfs4_exception exception = { };
5145         ssize_t ret;
5146         do {
5147                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5148                 trace_nfs4_get_acl(inode, ret);
5149                 if (ret >= 0)
5150                         break;
5151                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5152         } while (exception.retry);
5153         return ret;
5154 }
5155
5156 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5157 {
5158         struct nfs_server *server = NFS_SERVER(inode);
5159         int ret;
5160
5161         if (!nfs4_server_supports_acls(server))
5162                 return -EOPNOTSUPP;
5163         ret = nfs_revalidate_inode(server, inode);
5164         if (ret < 0)
5165                 return ret;
5166         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5167                 nfs_zap_acl_cache(inode);
5168         ret = nfs4_read_cached_acl(inode, buf, buflen);
5169         if (ret != -ENOENT)
5170                 /* -ENOENT is returned if there is no ACL or if there is an ACL
5171                  * but no cached acl data, just the acl length */
5172                 return ret;
5173         return nfs4_get_acl_uncached(inode, buf, buflen);
5174 }
5175
5176 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5177 {
5178         struct nfs_server *server = NFS_SERVER(inode);
5179         struct page *pages[NFS4ACL_MAXPAGES];
5180         struct nfs_setaclargs arg = {
5181                 .fh             = NFS_FH(inode),
5182                 .acl_pages      = pages,
5183                 .acl_len        = buflen,
5184         };
5185         struct nfs_setaclres res;
5186         struct rpc_message msg = {
5187                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5188                 .rpc_argp       = &arg,
5189                 .rpc_resp       = &res,
5190         };
5191         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5192         int ret, i;
5193
5194         if (!nfs4_server_supports_acls(server))
5195                 return -EOPNOTSUPP;
5196         if (npages > ARRAY_SIZE(pages))
5197                 return -ERANGE;
5198         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5199         if (i < 0)
5200                 return i;
5201         nfs4_inode_return_delegation(inode);
5202         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5203
5204         /*
5205          * Free each page after tx, so the only ref left is
5206          * held by the network stack
5207          */
5208         for (; i > 0; i--)
5209                 put_page(pages[i-1]);
5210
5211         /*
5212          * Acl update can result in inode attribute update.
5213          * so mark the attribute cache invalid.
5214          */
5215         spin_lock(&inode->i_lock);
5216         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
5217         spin_unlock(&inode->i_lock);
5218         nfs_access_zap_cache(inode);
5219         nfs_zap_acl_cache(inode);
5220         return ret;
5221 }
5222
5223 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5224 {
5225         struct nfs4_exception exception = { };
5226         int err;
5227         do {
5228                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5229                 trace_nfs4_set_acl(inode, err);
5230                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5231                                 &exception);
5232         } while (exception.retry);
5233         return err;
5234 }
5235
5236 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5237 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5238                                         size_t buflen)
5239 {
5240         struct nfs_server *server = NFS_SERVER(inode);
5241         struct nfs_fattr fattr;
5242         struct nfs4_label label = {0, 0, buflen, buf};
5243
5244         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5245         struct nfs4_getattr_arg arg = {
5246                 .fh             = NFS_FH(inode),
5247                 .bitmask        = bitmask,
5248         };
5249         struct nfs4_getattr_res res = {
5250                 .fattr          = &fattr,
5251                 .label          = &label,
5252                 .server         = server,
5253         };
5254         struct rpc_message msg = {
5255                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5256                 .rpc_argp       = &arg,
5257                 .rpc_resp       = &res,
5258         };
5259         int ret;
5260
5261         nfs_fattr_init(&fattr);
5262
5263         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5264         if (ret)
5265                 return ret;
5266         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5267                 return -ENOENT;
5268         if (buflen < label.len)
5269                 return -ERANGE;
5270         return 0;
5271 }
5272
5273 static int nfs4_get_security_label(struct inode *inode, void *buf,
5274                                         size_t buflen)
5275 {
5276         struct nfs4_exception exception = { };
5277         int err;
5278
5279         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5280                 return -EOPNOTSUPP;
5281
5282         do {
5283                 err = _nfs4_get_security_label(inode, buf, buflen);
5284                 trace_nfs4_get_security_label(inode, err);
5285                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5286                                 &exception);
5287         } while (exception.retry);
5288         return err;
5289 }
5290
5291 static int _nfs4_do_set_security_label(struct inode *inode,
5292                 struct nfs4_label *ilabel,
5293                 struct nfs_fattr *fattr,
5294                 struct nfs4_label *olabel)
5295 {
5296
5297         struct iattr sattr = {0};
5298         struct nfs_server *server = NFS_SERVER(inode);
5299         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5300         struct nfs_setattrargs arg = {
5301                 .fh             = NFS_FH(inode),
5302                 .iap            = &sattr,
5303                 .server         = server,
5304                 .bitmask        = bitmask,
5305                 .label          = ilabel,
5306         };
5307         struct nfs_setattrres res = {
5308                 .fattr          = fattr,
5309                 .label          = olabel,
5310                 .server         = server,
5311         };
5312         struct rpc_message msg = {
5313                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5314                 .rpc_argp       = &arg,
5315                 .rpc_resp       = &res,
5316         };
5317         int status;
5318
5319         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5320
5321         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5322         if (status)
5323                 dprintk("%s failed: %d\n", __func__, status);
5324
5325         return status;
5326 }
5327
5328 static int nfs4_do_set_security_label(struct inode *inode,
5329                 struct nfs4_label *ilabel,
5330                 struct nfs_fattr *fattr,
5331                 struct nfs4_label *olabel)
5332 {
5333         struct nfs4_exception exception = { };
5334         int err;
5335
5336         do {
5337                 err = _nfs4_do_set_security_label(inode, ilabel,
5338                                 fattr, olabel);
5339                 trace_nfs4_set_security_label(inode, err);
5340                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5341                                 &exception);
5342         } while (exception.retry);
5343         return err;
5344 }
5345
5346 static int
5347 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5348 {
5349         struct nfs4_label ilabel, *olabel = NULL;
5350         struct nfs_fattr fattr;
5351         struct rpc_cred *cred;
5352         int status;
5353
5354         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5355                 return -EOPNOTSUPP;
5356
5357         nfs_fattr_init(&fattr);
5358
5359         ilabel.pi = 0;
5360         ilabel.lfs = 0;
5361         ilabel.label = (char *)buf;
5362         ilabel.len = buflen;
5363
5364         cred = rpc_lookup_cred();
5365         if (IS_ERR(cred))
5366                 return PTR_ERR(cred);
5367
5368         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5369         if (IS_ERR(olabel)) {
5370                 status = -PTR_ERR(olabel);
5371                 goto out;
5372         }
5373
5374         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5375         if (status == 0)
5376                 nfs_setsecurity(inode, &fattr, olabel);
5377
5378         nfs4_label_free(olabel);
5379 out:
5380         put_rpccred(cred);
5381         return status;
5382 }
5383 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5384
5385
5386 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5387                                     nfs4_verifier *bootverf)
5388 {
5389         __be32 verf[2];
5390
5391         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5392                 /* An impossible timestamp guarantees this value
5393                  * will never match a generated boot time. */
5394                 verf[0] = cpu_to_be32(U32_MAX);
5395                 verf[1] = cpu_to_be32(U32_MAX);
5396         } else {
5397                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5398                 u64 ns = ktime_to_ns(nn->boot_time);
5399
5400                 verf[0] = cpu_to_be32(ns >> 32);
5401                 verf[1] = cpu_to_be32(ns);
5402         }
5403         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5404 }
5405
5406 static int
5407 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5408 {
5409         size_t len;
5410         char *str;
5411
5412         if (clp->cl_owner_id != NULL)
5413                 return 0;
5414
5415         rcu_read_lock();
5416         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5417                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5418                 1 +
5419                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5420                 1;
5421         rcu_read_unlock();
5422
5423         if (len > NFS4_OPAQUE_LIMIT + 1)
5424                 return -EINVAL;
5425
5426         /*
5427          * Since this string is allocated at mount time, and held until the
5428          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5429          * about a memory-reclaim deadlock.
5430          */
5431         str = kmalloc(len, GFP_KERNEL);
5432         if (!str)
5433                 return -ENOMEM;
5434
5435         rcu_read_lock();
5436         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5437                         clp->cl_ipaddr,
5438                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5439                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5440         rcu_read_unlock();
5441
5442         clp->cl_owner_id = str;
5443         return 0;
5444 }
5445
5446 static int
5447 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5448 {
5449         size_t len;
5450         char *str;
5451
5452         len = 10 + 10 + 1 + 10 + 1 +
5453                 strlen(nfs4_client_id_uniquifier) + 1 +
5454                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5455
5456         if (len > NFS4_OPAQUE_LIMIT + 1)
5457                 return -EINVAL;
5458
5459         /*
5460          * Since this string is allocated at mount time, and held until the
5461          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5462          * about a memory-reclaim deadlock.
5463          */
5464         str = kmalloc(len, GFP_KERNEL);
5465         if (!str)
5466                 return -ENOMEM;
5467
5468         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5469                         clp->rpc_ops->version, clp->cl_minorversion,
5470                         nfs4_client_id_uniquifier,
5471                         clp->cl_rpcclient->cl_nodename);
5472         clp->cl_owner_id = str;
5473         return 0;
5474 }
5475
5476 static int
5477 nfs4_init_uniform_client_string(struct nfs_client *clp)
5478 {
5479         size_t len;
5480         char *str;
5481
5482         if (clp->cl_owner_id != NULL)
5483                 return 0;
5484
5485         if (nfs4_client_id_uniquifier[0] != '\0')
5486                 return nfs4_init_uniquifier_client_string(clp);
5487
5488         len = 10 + 10 + 1 + 10 + 1 +
5489                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5490
5491         if (len > NFS4_OPAQUE_LIMIT + 1)
5492                 return -EINVAL;
5493
5494         /*
5495          * Since this string is allocated at mount time, and held until the
5496          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5497          * about a memory-reclaim deadlock.
5498          */
5499         str = kmalloc(len, GFP_KERNEL);
5500         if (!str)
5501                 return -ENOMEM;
5502
5503         scnprintf(str, len, "Linux NFSv%u.%u %s",
5504                         clp->rpc_ops->version, clp->cl_minorversion,
5505                         clp->cl_rpcclient->cl_nodename);
5506         clp->cl_owner_id = str;
5507         return 0;
5508 }
5509
5510 /*
5511  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5512  * services.  Advertise one based on the address family of the
5513  * clientaddr.
5514  */
5515 static unsigned int
5516 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5517 {
5518         if (strchr(clp->cl_ipaddr, ':') != NULL)
5519                 return scnprintf(buf, len, "tcp6");
5520         else
5521                 return scnprintf(buf, len, "tcp");
5522 }
5523
5524 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5525 {
5526         struct nfs4_setclientid *sc = calldata;
5527
5528         if (task->tk_status == 0)
5529                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5530 }
5531
5532 static const struct rpc_call_ops nfs4_setclientid_ops = {
5533         .rpc_call_done = nfs4_setclientid_done,
5534 };
5535
5536 /**
5537  * nfs4_proc_setclientid - Negotiate client ID
5538  * @clp: state data structure
5539  * @program: RPC program for NFSv4 callback service
5540  * @port: IP port number for NFS4 callback service
5541  * @cred: RPC credential to use for this call
5542  * @res: where to place the result
5543  *
5544  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5545  */
5546 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5547                 unsigned short port, struct rpc_cred *cred,
5548                 struct nfs4_setclientid_res *res)
5549 {
5550         nfs4_verifier sc_verifier;
5551         struct nfs4_setclientid setclientid = {
5552                 .sc_verifier = &sc_verifier,
5553                 .sc_prog = program,
5554                 .sc_clnt = clp,
5555         };
5556         struct rpc_message msg = {
5557                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5558                 .rpc_argp = &setclientid,
5559                 .rpc_resp = res,
5560                 .rpc_cred = cred,
5561         };
5562         struct rpc_task *task;
5563         struct rpc_task_setup task_setup_data = {
5564                 .rpc_client = clp->cl_rpcclient,
5565                 .rpc_message = &msg,
5566                 .callback_ops = &nfs4_setclientid_ops,
5567                 .callback_data = &setclientid,
5568                 .flags = RPC_TASK_TIMEOUT,
5569         };
5570         int status;
5571
5572         /* nfs_client_id4 */
5573         nfs4_init_boot_verifier(clp, &sc_verifier);
5574
5575         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5576                 status = nfs4_init_uniform_client_string(clp);
5577         else
5578                 status = nfs4_init_nonuniform_client_string(clp);
5579
5580         if (status)
5581                 goto out;
5582
5583         /* cb_client4 */
5584         setclientid.sc_netid_len =
5585                                 nfs4_init_callback_netid(clp,
5586                                                 setclientid.sc_netid,
5587                                                 sizeof(setclientid.sc_netid));
5588         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5589                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5590                                 clp->cl_ipaddr, port >> 8, port & 255);
5591
5592         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5593                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5594                 clp->cl_owner_id);
5595         task = rpc_run_task(&task_setup_data);
5596         if (IS_ERR(task)) {
5597                 status = PTR_ERR(task);
5598                 goto out;
5599         }
5600         status = task->tk_status;
5601         if (setclientid.sc_cred) {
5602                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5603                 put_rpccred(setclientid.sc_cred);
5604         }
5605         rpc_put_task(task);
5606 out:
5607         trace_nfs4_setclientid(clp, status);
5608         dprintk("NFS reply setclientid: %d\n", status);
5609         return status;
5610 }
5611
5612 /**
5613  * nfs4_proc_setclientid_confirm - Confirm client ID
5614  * @clp: state data structure
5615  * @res: result of a previous SETCLIENTID
5616  * @cred: RPC credential to use for this call
5617  *
5618  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5619  */
5620 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5621                 struct nfs4_setclientid_res *arg,
5622                 struct rpc_cred *cred)
5623 {
5624         struct rpc_message msg = {
5625                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5626                 .rpc_argp = arg,
5627                 .rpc_cred = cred,
5628         };
5629         int status;
5630
5631         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5632                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5633                 clp->cl_clientid);
5634         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5635         trace_nfs4_setclientid_confirm(clp, status);
5636         dprintk("NFS reply setclientid_confirm: %d\n", status);
5637         return status;
5638 }
5639
5640 struct nfs4_delegreturndata {
5641         struct nfs4_delegreturnargs args;
5642         struct nfs4_delegreturnres res;
5643         struct nfs_fh fh;
5644         nfs4_stateid stateid;
5645         unsigned long timestamp;
5646         struct {
5647                 struct nfs4_layoutreturn_args arg;
5648                 struct nfs4_layoutreturn_res res;
5649                 struct nfs4_xdr_opaque_data ld_private;
5650                 u32 roc_barrier;
5651                 bool roc;
5652         } lr;
5653         struct nfs_fattr fattr;
5654         int rpc_status;
5655         struct inode *inode;
5656 };
5657
5658 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5659 {
5660         struct nfs4_delegreturndata *data = calldata;
5661
5662         if (!nfs4_sequence_done(task, &data->res.seq_res))
5663                 return;
5664
5665         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5666
5667         /* Handle Layoutreturn errors */
5668         if (data->args.lr_args && task->tk_status != 0) {
5669                 switch(data->res.lr_ret) {
5670                 default:
5671                         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
5672                         break;
5673                 case 0:
5674                         data->args.lr_args = NULL;
5675                         data->res.lr_res = NULL;
5676                         break;
5677                 case -NFS4ERR_ADMIN_REVOKED:
5678                 case -NFS4ERR_DELEG_REVOKED:
5679                 case -NFS4ERR_EXPIRED:
5680                 case -NFS4ERR_BAD_STATEID:
5681                 case -NFS4ERR_OLD_STATEID:
5682                 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
5683                 case -NFS4ERR_WRONG_CRED:
5684                         data->args.lr_args = NULL;
5685                         data->res.lr_res = NULL;
5686                         data->res.lr_ret = 0;
5687                         rpc_restart_call_prepare(task);
5688                         return;
5689                 }
5690         }
5691
5692         switch (task->tk_status) {
5693         case 0:
5694                 renew_lease(data->res.server, data->timestamp);
5695                 break;
5696         case -NFS4ERR_ADMIN_REVOKED:
5697         case -NFS4ERR_DELEG_REVOKED:
5698         case -NFS4ERR_EXPIRED:
5699                 nfs4_free_revoked_stateid(data->res.server,
5700                                 data->args.stateid,
5701                                 task->tk_msg.rpc_cred);
5702         case -NFS4ERR_BAD_STATEID:
5703         case -NFS4ERR_OLD_STATEID:
5704         case -NFS4ERR_STALE_STATEID:
5705                 task->tk_status = 0;
5706                 break;
5707         case -NFS4ERR_ACCESS:
5708                 if (data->args.bitmask) {
5709                         data->args.bitmask = NULL;
5710                         data->res.fattr = NULL;
5711                         task->tk_status = 0;
5712                         rpc_restart_call_prepare(task);
5713                         return;
5714                 }
5715         default:
5716                 if (nfs4_async_handle_error(task, data->res.server,
5717                                             NULL, NULL) == -EAGAIN) {
5718                         rpc_restart_call_prepare(task);
5719                         return;
5720                 }
5721         }
5722         data->rpc_status = task->tk_status;
5723 }
5724
5725 static void nfs4_delegreturn_release(void *calldata)
5726 {
5727         struct nfs4_delegreturndata *data = calldata;
5728         struct inode *inode = data->inode;
5729
5730         if (inode) {
5731                 if (data->lr.roc)
5732                         pnfs_roc_release(&data->lr.arg, &data->lr.res,
5733                                         data->res.lr_ret);
5734                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5735                 nfs_iput_and_deactive(inode);
5736         }
5737         kfree(calldata);
5738 }
5739
5740 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5741 {
5742         struct nfs4_delegreturndata *d_data;
5743
5744         d_data = (struct nfs4_delegreturndata *)data;
5745
5746         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task))
5747                 return;
5748
5749         nfs4_setup_sequence(d_data->res.server->nfs_client,
5750                         &d_data->args.seq_args,
5751                         &d_data->res.seq_res,
5752                         task);
5753 }
5754
5755 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5756         .rpc_call_prepare = nfs4_delegreturn_prepare,
5757         .rpc_call_done = nfs4_delegreturn_done,
5758         .rpc_release = nfs4_delegreturn_release,
5759 };
5760
5761 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5762 {
5763         struct nfs4_delegreturndata *data;
5764         struct nfs_server *server = NFS_SERVER(inode);
5765         struct rpc_task *task;
5766         struct rpc_message msg = {
5767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5768                 .rpc_cred = cred,
5769         };
5770         struct rpc_task_setup task_setup_data = {
5771                 .rpc_client = server->client,
5772                 .rpc_message = &msg,
5773                 .callback_ops = &nfs4_delegreturn_ops,
5774                 .flags = RPC_TASK_ASYNC,
5775         };
5776         int status = 0;
5777
5778         data = kzalloc(sizeof(*data), GFP_NOFS);
5779         if (data == NULL)
5780                 return -ENOMEM;
5781         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5782
5783         nfs4_state_protect(server->nfs_client,
5784                         NFS_SP4_MACH_CRED_CLEANUP,
5785                         &task_setup_data.rpc_client, &msg);
5786
5787         data->args.fhandle = &data->fh;
5788         data->args.stateid = &data->stateid;
5789         data->args.bitmask = server->cache_consistency_bitmask;
5790         nfs_copy_fh(&data->fh, NFS_FH(inode));
5791         nfs4_stateid_copy(&data->stateid, stateid);
5792         data->res.fattr = &data->fattr;
5793         data->res.server = server;
5794         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
5795         data->lr.arg.ld_private = &data->lr.ld_private;
5796         nfs_fattr_init(data->res.fattr);
5797         data->timestamp = jiffies;
5798         data->rpc_status = 0;
5799         data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
5800         data->inode = nfs_igrab_and_active(inode);
5801         if (data->inode) {
5802                 if (data->lr.roc) {
5803                         data->args.lr_args = &data->lr.arg;
5804                         data->res.lr_res = &data->lr.res;
5805                 }
5806         } else if (data->lr.roc) {
5807                 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
5808                 data->lr.roc = false;
5809         }
5810
5811         task_setup_data.callback_data = data;
5812         msg.rpc_argp = &data->args;
5813         msg.rpc_resp = &data->res;
5814         task = rpc_run_task(&task_setup_data);
5815         if (IS_ERR(task))
5816                 return PTR_ERR(task);
5817         if (!issync)
5818                 goto out;
5819         status = nfs4_wait_for_completion_rpc_task(task);
5820         if (status != 0)
5821                 goto out;
5822         status = data->rpc_status;
5823 out:
5824         rpc_put_task(task);
5825         return status;
5826 }
5827
5828 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5829 {
5830         struct nfs_server *server = NFS_SERVER(inode);
5831         struct nfs4_exception exception = { };
5832         int err;
5833         do {
5834                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5835                 trace_nfs4_delegreturn(inode, stateid, err);
5836                 switch (err) {
5837                         case -NFS4ERR_STALE_STATEID:
5838                         case -NFS4ERR_EXPIRED:
5839                         case 0:
5840                                 return 0;
5841                 }
5842                 err = nfs4_handle_exception(server, err, &exception);
5843         } while (exception.retry);
5844         return err;
5845 }
5846
5847 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5848 {
5849         struct inode *inode = state->inode;
5850         struct nfs_server *server = NFS_SERVER(inode);
5851         struct nfs_client *clp = server->nfs_client;
5852         struct nfs_lockt_args arg = {
5853                 .fh = NFS_FH(inode),
5854                 .fl = request,
5855         };
5856         struct nfs_lockt_res res = {
5857                 .denied = request,
5858         };
5859         struct rpc_message msg = {
5860                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5861                 .rpc_argp       = &arg,
5862                 .rpc_resp       = &res,
5863                 .rpc_cred       = state->owner->so_cred,
5864         };
5865         struct nfs4_lock_state *lsp;
5866         int status;
5867
5868         arg.lock_owner.clientid = clp->cl_clientid;
5869         status = nfs4_set_lock_state(state, request);
5870         if (status != 0)
5871                 goto out;
5872         lsp = request->fl_u.nfs4_fl.owner;
5873         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5874         arg.lock_owner.s_dev = server->s_dev;
5875         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5876         switch (status) {
5877                 case 0:
5878                         request->fl_type = F_UNLCK;
5879                         break;
5880                 case -NFS4ERR_DENIED:
5881                         status = 0;
5882         }
5883         request->fl_ops->fl_release_private(request);
5884         request->fl_ops = NULL;
5885 out:
5886         return status;
5887 }
5888
5889 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5890 {
5891         struct nfs4_exception exception = { };
5892         int err;
5893
5894         do {
5895                 err = _nfs4_proc_getlk(state, cmd, request);
5896                 trace_nfs4_get_lock(request, state, cmd, err);
5897                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5898                                 &exception);
5899         } while (exception.retry);
5900         return err;
5901 }
5902
5903 struct nfs4_unlockdata {
5904         struct nfs_locku_args arg;
5905         struct nfs_locku_res res;
5906         struct nfs4_lock_state *lsp;
5907         struct nfs_open_context *ctx;
5908         struct file_lock fl;
5909         struct nfs_server *server;
5910         unsigned long timestamp;
5911 };
5912
5913 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5914                 struct nfs_open_context *ctx,
5915                 struct nfs4_lock_state *lsp,
5916                 struct nfs_seqid *seqid)
5917 {
5918         struct nfs4_unlockdata *p;
5919         struct inode *inode = lsp->ls_state->inode;
5920
5921         p = kzalloc(sizeof(*p), GFP_NOFS);
5922         if (p == NULL)
5923                 return NULL;
5924         p->arg.fh = NFS_FH(inode);
5925         p->arg.fl = &p->fl;
5926         p->arg.seqid = seqid;
5927         p->res.seqid = seqid;
5928         p->lsp = lsp;
5929         atomic_inc(&lsp->ls_count);
5930         /* Ensure we don't close file until we're done freeing locks! */
5931         p->ctx = get_nfs_open_context(ctx);
5932         memcpy(&p->fl, fl, sizeof(p->fl));
5933         p->server = NFS_SERVER(inode);
5934         return p;
5935 }
5936
5937 static void nfs4_locku_release_calldata(void *data)
5938 {
5939         struct nfs4_unlockdata *calldata = data;
5940         nfs_free_seqid(calldata->arg.seqid);
5941         nfs4_put_lock_state(calldata->lsp);
5942         put_nfs_open_context(calldata->ctx);
5943         kfree(calldata);
5944 }
5945
5946 static void nfs4_locku_done(struct rpc_task *task, void *data)
5947 {
5948         struct nfs4_unlockdata *calldata = data;
5949
5950         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5951                 return;
5952         switch (task->tk_status) {
5953                 case 0:
5954                         renew_lease(calldata->server, calldata->timestamp);
5955                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
5956                         if (nfs4_update_lock_stateid(calldata->lsp,
5957                                         &calldata->res.stateid))
5958                                 break;
5959                 case -NFS4ERR_ADMIN_REVOKED:
5960                 case -NFS4ERR_EXPIRED:
5961                         nfs4_free_revoked_stateid(calldata->server,
5962                                         &calldata->arg.stateid,
5963                                         task->tk_msg.rpc_cred);
5964                 case -NFS4ERR_BAD_STATEID:
5965                 case -NFS4ERR_OLD_STATEID:
5966                 case -NFS4ERR_STALE_STATEID:
5967                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5968                                                 &calldata->lsp->ls_stateid))
5969                                 rpc_restart_call_prepare(task);
5970                         break;
5971                 default:
5972                         if (nfs4_async_handle_error(task, calldata->server,
5973                                                     NULL, NULL) == -EAGAIN)
5974                                 rpc_restart_call_prepare(task);
5975         }
5976         nfs_release_seqid(calldata->arg.seqid);
5977 }
5978
5979 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5980 {
5981         struct nfs4_unlockdata *calldata = data;
5982
5983         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5984                 goto out_wait;
5985         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5986         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5987                 /* Note: exit _without_ running nfs4_locku_done */
5988                 goto out_no_action;
5989         }
5990         calldata->timestamp = jiffies;
5991         if (nfs4_setup_sequence(calldata->server->nfs_client,
5992                                 &calldata->arg.seq_args,
5993                                 &calldata->res.seq_res,
5994                                 task) != 0)
5995                 nfs_release_seqid(calldata->arg.seqid);
5996         return;
5997 out_no_action:
5998         task->tk_action = NULL;
5999 out_wait:
6000         nfs4_sequence_done(task, &calldata->res.seq_res);
6001 }
6002
6003 static const struct rpc_call_ops nfs4_locku_ops = {
6004         .rpc_call_prepare = nfs4_locku_prepare,
6005         .rpc_call_done = nfs4_locku_done,
6006         .rpc_release = nfs4_locku_release_calldata,
6007 };
6008
6009 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6010                 struct nfs_open_context *ctx,
6011                 struct nfs4_lock_state *lsp,
6012                 struct nfs_seqid *seqid)
6013 {
6014         struct nfs4_unlockdata *data;
6015         struct rpc_message msg = {
6016                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6017                 .rpc_cred = ctx->cred,
6018         };
6019         struct rpc_task_setup task_setup_data = {
6020                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6021                 .rpc_message = &msg,
6022                 .callback_ops = &nfs4_locku_ops,
6023                 .workqueue = nfsiod_workqueue,
6024                 .flags = RPC_TASK_ASYNC,
6025         };
6026
6027         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6028                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6029
6030         /* Ensure this is an unlock - when canceling a lock, the
6031          * canceled lock is passed in, and it won't be an unlock.
6032          */
6033         fl->fl_type = F_UNLCK;
6034
6035         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6036         if (data == NULL) {
6037                 nfs_free_seqid(seqid);
6038                 return ERR_PTR(-ENOMEM);
6039         }
6040
6041         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
6042         msg.rpc_argp = &data->arg;
6043         msg.rpc_resp = &data->res;
6044         task_setup_data.callback_data = data;
6045         return rpc_run_task(&task_setup_data);
6046 }
6047
6048 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6049 {
6050         struct inode *inode = state->inode;
6051         struct nfs4_state_owner *sp = state->owner;
6052         struct nfs_inode *nfsi = NFS_I(inode);
6053         struct nfs_seqid *seqid;
6054         struct nfs4_lock_state *lsp;
6055         struct rpc_task *task;
6056         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6057         int status = 0;
6058         unsigned char fl_flags = request->fl_flags;
6059
6060         status = nfs4_set_lock_state(state, request);
6061         /* Unlock _before_ we do the RPC call */
6062         request->fl_flags |= FL_EXISTS;
6063         /* Exclude nfs_delegation_claim_locks() */
6064         mutex_lock(&sp->so_delegreturn_mutex);
6065         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6066         down_read(&nfsi->rwsem);
6067         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6068                 up_read(&nfsi->rwsem);
6069                 mutex_unlock(&sp->so_delegreturn_mutex);
6070                 goto out;
6071         }
6072         up_read(&nfsi->rwsem);
6073         mutex_unlock(&sp->so_delegreturn_mutex);
6074         if (status != 0)
6075                 goto out;
6076         /* Is this a delegated lock? */
6077         lsp = request->fl_u.nfs4_fl.owner;
6078         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6079                 goto out;
6080         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6081         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6082         status = -ENOMEM;
6083         if (IS_ERR(seqid))
6084                 goto out;
6085         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6086         status = PTR_ERR(task);
6087         if (IS_ERR(task))
6088                 goto out;
6089         status = nfs4_wait_for_completion_rpc_task(task);
6090         rpc_put_task(task);
6091 out:
6092         request->fl_flags = fl_flags;
6093         trace_nfs4_unlock(request, state, F_SETLK, status);
6094         return status;
6095 }
6096
6097 struct nfs4_lockdata {
6098         struct nfs_lock_args arg;
6099         struct nfs_lock_res res;
6100         struct nfs4_lock_state *lsp;
6101         struct nfs_open_context *ctx;
6102         struct file_lock fl;
6103         unsigned long timestamp;
6104         int rpc_status;
6105         int cancelled;
6106         struct nfs_server *server;
6107 };
6108
6109 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6110                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6111                 gfp_t gfp_mask)
6112 {
6113         struct nfs4_lockdata *p;
6114         struct inode *inode = lsp->ls_state->inode;
6115         struct nfs_server *server = NFS_SERVER(inode);
6116         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6117
6118         p = kzalloc(sizeof(*p), gfp_mask);
6119         if (p == NULL)
6120                 return NULL;
6121
6122         p->arg.fh = NFS_FH(inode);
6123         p->arg.fl = &p->fl;
6124         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6125         if (IS_ERR(p->arg.open_seqid))
6126                 goto out_free;
6127         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6128         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6129         if (IS_ERR(p->arg.lock_seqid))
6130                 goto out_free_seqid;
6131         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6132         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6133         p->arg.lock_owner.s_dev = server->s_dev;
6134         p->res.lock_seqid = p->arg.lock_seqid;
6135         p->lsp = lsp;
6136         p->server = server;
6137         atomic_inc(&lsp->ls_count);
6138         p->ctx = get_nfs_open_context(ctx);
6139         memcpy(&p->fl, fl, sizeof(p->fl));
6140         return p;
6141 out_free_seqid:
6142         nfs_free_seqid(p->arg.open_seqid);
6143 out_free:
6144         kfree(p);
6145         return NULL;
6146 }
6147
6148 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6149 {
6150         struct nfs4_lockdata *data = calldata;
6151         struct nfs4_state *state = data->lsp->ls_state;
6152
6153         dprintk("%s: begin!\n", __func__);
6154         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6155                 goto out_wait;
6156         /* Do we need to do an open_to_lock_owner? */
6157         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6158                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6159                         goto out_release_lock_seqid;
6160                 }
6161                 nfs4_stateid_copy(&data->arg.open_stateid,
6162                                 &state->open_stateid);
6163                 data->arg.new_lock_owner = 1;
6164                 data->res.open_seqid = data->arg.open_seqid;
6165         } else {
6166                 data->arg.new_lock_owner = 0;
6167                 nfs4_stateid_copy(&data->arg.lock_stateid,
6168                                 &data->lsp->ls_stateid);
6169         }
6170         if (!nfs4_valid_open_stateid(state)) {
6171                 data->rpc_status = -EBADF;
6172                 task->tk_action = NULL;
6173                 goto out_release_open_seqid;
6174         }
6175         data->timestamp = jiffies;
6176         if (nfs4_setup_sequence(data->server->nfs_client,
6177                                 &data->arg.seq_args,
6178                                 &data->res.seq_res,
6179                                 task) == 0)
6180                 return;
6181 out_release_open_seqid:
6182         nfs_release_seqid(data->arg.open_seqid);
6183 out_release_lock_seqid:
6184         nfs_release_seqid(data->arg.lock_seqid);
6185 out_wait:
6186         nfs4_sequence_done(task, &data->res.seq_res);
6187         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6188 }
6189
6190 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6191 {
6192         struct nfs4_lockdata *data = calldata;
6193         struct nfs4_lock_state *lsp = data->lsp;
6194
6195         dprintk("%s: begin!\n", __func__);
6196
6197         if (!nfs4_sequence_done(task, &data->res.seq_res))
6198                 return;
6199
6200         data->rpc_status = task->tk_status;
6201         switch (task->tk_status) {
6202         case 0:
6203                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6204                                 data->timestamp);
6205                 if (data->arg.new_lock) {
6206                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6207                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) {
6208                                 rpc_restart_call_prepare(task);
6209                                 break;
6210                         }
6211                 }
6212                 if (data->arg.new_lock_owner != 0) {
6213                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
6214                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6215                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6216                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
6217                         rpc_restart_call_prepare(task);
6218                 break;
6219         case -NFS4ERR_BAD_STATEID:
6220         case -NFS4ERR_OLD_STATEID:
6221         case -NFS4ERR_STALE_STATEID:
6222         case -NFS4ERR_EXPIRED:
6223                 if (data->arg.new_lock_owner != 0) {
6224                         if (!nfs4_stateid_match(&data->arg.open_stateid,
6225                                                 &lsp->ls_state->open_stateid))
6226                                 rpc_restart_call_prepare(task);
6227                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
6228                                                 &lsp->ls_stateid))
6229                                 rpc_restart_call_prepare(task);
6230         }
6231         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
6232 }
6233
6234 static void nfs4_lock_release(void *calldata)
6235 {
6236         struct nfs4_lockdata *data = calldata;
6237
6238         dprintk("%s: begin!\n", __func__);
6239         nfs_free_seqid(data->arg.open_seqid);
6240         if (data->cancelled != 0) {
6241                 struct rpc_task *task;
6242                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6243                                 data->arg.lock_seqid);
6244                 if (!IS_ERR(task))
6245                         rpc_put_task_async(task);
6246                 dprintk("%s: cancelling lock!\n", __func__);
6247         } else
6248                 nfs_free_seqid(data->arg.lock_seqid);
6249         nfs4_put_lock_state(data->lsp);
6250         put_nfs_open_context(data->ctx);
6251         kfree(data);
6252         dprintk("%s: done!\n", __func__);
6253 }
6254
6255 static const struct rpc_call_ops nfs4_lock_ops = {
6256         .rpc_call_prepare = nfs4_lock_prepare,
6257         .rpc_call_done = nfs4_lock_done,
6258         .rpc_release = nfs4_lock_release,
6259 };
6260
6261 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6262 {
6263         switch (error) {
6264         case -NFS4ERR_ADMIN_REVOKED:
6265         case -NFS4ERR_EXPIRED:
6266         case -NFS4ERR_BAD_STATEID:
6267                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6268                 if (new_lock_owner != 0 ||
6269                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6270                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6271                 break;
6272         case -NFS4ERR_STALE_STATEID:
6273                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6274                 nfs4_schedule_lease_recovery(server->nfs_client);
6275         };
6276 }
6277
6278 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6279 {
6280         struct nfs4_lockdata *data;
6281         struct rpc_task *task;
6282         struct rpc_message msg = {
6283                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6284                 .rpc_cred = state->owner->so_cred,
6285         };
6286         struct rpc_task_setup task_setup_data = {
6287                 .rpc_client = NFS_CLIENT(state->inode),
6288                 .rpc_message = &msg,
6289                 .callback_ops = &nfs4_lock_ops,
6290                 .workqueue = nfsiod_workqueue,
6291                 .flags = RPC_TASK_ASYNC,
6292         };
6293         int ret;
6294
6295         dprintk("%s: begin!\n", __func__);
6296         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6297                         fl->fl_u.nfs4_fl.owner,
6298                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6299         if (data == NULL)
6300                 return -ENOMEM;
6301         if (IS_SETLKW(cmd))
6302                 data->arg.block = 1;
6303         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
6304         msg.rpc_argp = &data->arg;
6305         msg.rpc_resp = &data->res;
6306         task_setup_data.callback_data = data;
6307         if (recovery_type > NFS_LOCK_NEW) {
6308                 if (recovery_type == NFS_LOCK_RECLAIM)
6309                         data->arg.reclaim = NFS_LOCK_RECLAIM;
6310                 nfs4_set_sequence_privileged(&data->arg.seq_args);
6311         } else
6312                 data->arg.new_lock = 1;
6313         task = rpc_run_task(&task_setup_data);
6314         if (IS_ERR(task))
6315                 return PTR_ERR(task);
6316         ret = nfs4_wait_for_completion_rpc_task(task);
6317         if (ret == 0) {
6318                 ret = data->rpc_status;
6319                 if (ret)
6320                         nfs4_handle_setlk_error(data->server, data->lsp,
6321                                         data->arg.new_lock_owner, ret);
6322         } else
6323                 data->cancelled = 1;
6324         rpc_put_task(task);
6325         dprintk("%s: done, ret = %d!\n", __func__, ret);
6326         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
6327         return ret;
6328 }
6329
6330 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
6331 {
6332         struct nfs_server *server = NFS_SERVER(state->inode);
6333         struct nfs4_exception exception = {
6334                 .inode = state->inode,
6335         };
6336         int err;
6337
6338         do {
6339                 /* Cache the lock if possible... */
6340                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6341                         return 0;
6342                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
6343                 if (err != -NFS4ERR_DELAY)
6344                         break;
6345                 nfs4_handle_exception(server, err, &exception);
6346         } while (exception.retry);
6347         return err;
6348 }
6349
6350 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6351 {
6352         struct nfs_server *server = NFS_SERVER(state->inode);
6353         struct nfs4_exception exception = {
6354                 .inode = state->inode,
6355         };
6356         int err;
6357
6358         err = nfs4_set_lock_state(state, request);
6359         if (err != 0)
6360                 return err;
6361         if (!recover_lost_locks) {
6362                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6363                 return 0;
6364         }
6365         do {
6366                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6367                         return 0;
6368                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6369                 switch (err) {
6370                 default:
6371                         goto out;
6372                 case -NFS4ERR_GRACE:
6373                 case -NFS4ERR_DELAY:
6374                         nfs4_handle_exception(server, err, &exception);
6375                         err = 0;
6376                 }
6377         } while (exception.retry);
6378 out:
6379         return err;
6380 }
6381
6382 #if defined(CONFIG_NFS_V4_1)
6383 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6384 {
6385         struct nfs4_lock_state *lsp;
6386         int status;
6387
6388         status = nfs4_set_lock_state(state, request);
6389         if (status != 0)
6390                 return status;
6391         lsp = request->fl_u.nfs4_fl.owner;
6392         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
6393             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
6394                 return 0;
6395         status = nfs4_lock_expired(state, request);
6396         return status;
6397 }
6398 #endif
6399
6400 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6401 {
6402         struct nfs_inode *nfsi = NFS_I(state->inode);
6403         struct nfs4_state_owner *sp = state->owner;
6404         unsigned char fl_flags = request->fl_flags;
6405         int status;
6406
6407         request->fl_flags |= FL_ACCESS;
6408         status = locks_lock_inode_wait(state->inode, request);
6409         if (status < 0)
6410                 goto out;
6411         mutex_lock(&sp->so_delegreturn_mutex);
6412         down_read(&nfsi->rwsem);
6413         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6414                 /* Yes: cache locks! */
6415                 /* ...but avoid races with delegation recall... */
6416                 request->fl_flags = fl_flags & ~FL_SLEEP;
6417                 status = locks_lock_inode_wait(state->inode, request);
6418                 up_read(&nfsi->rwsem);
6419                 mutex_unlock(&sp->so_delegreturn_mutex);
6420                 goto out;
6421         }
6422         up_read(&nfsi->rwsem);
6423         mutex_unlock(&sp->so_delegreturn_mutex);
6424         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6425 out:
6426         request->fl_flags = fl_flags;
6427         return status;
6428 }
6429
6430 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6431 {
6432         struct nfs4_exception exception = {
6433                 .state = state,
6434                 .inode = state->inode,
6435         };
6436         int err;
6437
6438         do {
6439                 err = _nfs4_proc_setlk(state, cmd, request);
6440                 if (err == -NFS4ERR_DENIED)
6441                         err = -EAGAIN;
6442                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6443                                 err, &exception);
6444         } while (exception.retry);
6445         return err;
6446 }
6447
6448 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
6449 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
6450
6451 static int
6452 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
6453                         struct file_lock *request)
6454 {
6455         int             status = -ERESTARTSYS;
6456         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
6457
6458         while(!signalled()) {
6459                 status = nfs4_proc_setlk(state, cmd, request);
6460                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6461                         break;
6462                 freezable_schedule_timeout_interruptible(timeout);
6463                 timeout *= 2;
6464                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
6465                 status = -ERESTARTSYS;
6466         }
6467         return status;
6468 }
6469
6470 #ifdef CONFIG_NFS_V4_1
6471 struct nfs4_lock_waiter {
6472         struct task_struct      *task;
6473         struct inode            *inode;
6474         struct nfs_lowner       *owner;
6475         bool                    notified;
6476 };
6477
6478 static int
6479 nfs4_wake_lock_waiter(wait_queue_t *wait, unsigned int mode, int flags, void *key)
6480 {
6481         int ret;
6482         struct cb_notify_lock_args *cbnl = key;
6483         struct nfs4_lock_waiter *waiter = wait->private;
6484         struct nfs_lowner       *lowner = &cbnl->cbnl_owner,
6485                                 *wowner = waiter->owner;
6486
6487         /* Only wake if the callback was for the same owner */
6488         if (lowner->clientid != wowner->clientid ||
6489             lowner->id != wowner->id             ||
6490             lowner->s_dev != wowner->s_dev)
6491                 return 0;
6492
6493         /* Make sure it's for the right inode */
6494         if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
6495                 return 0;
6496
6497         waiter->notified = true;
6498
6499         /* override "private" so we can use default_wake_function */
6500         wait->private = waiter->task;
6501         ret = autoremove_wake_function(wait, mode, flags, key);
6502         wait->private = waiter;
6503         return ret;
6504 }
6505
6506 static int
6507 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6508 {
6509         int status = -ERESTARTSYS;
6510         unsigned long flags;
6511         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
6512         struct nfs_server *server = NFS_SERVER(state->inode);
6513         struct nfs_client *clp = server->nfs_client;
6514         wait_queue_head_t *q = &clp->cl_lock_waitq;
6515         struct nfs_lowner owner = { .clientid = clp->cl_clientid,
6516                                     .id = lsp->ls_seqid.owner_id,
6517                                     .s_dev = server->s_dev };
6518         struct nfs4_lock_waiter waiter = { .task  = current,
6519                                            .inode = state->inode,
6520                                            .owner = &owner,
6521                                            .notified = false };
6522         wait_queue_t wait;
6523
6524         /* Don't bother with waitqueue if we don't expect a callback */
6525         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
6526                 return nfs4_retry_setlk_simple(state, cmd, request);
6527
6528         init_wait(&wait);
6529         wait.private = &waiter;
6530         wait.func = nfs4_wake_lock_waiter;
6531         add_wait_queue(q, &wait);
6532
6533         while(!signalled()) {
6534                 status = nfs4_proc_setlk(state, cmd, request);
6535                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6536                         break;
6537
6538                 status = -ERESTARTSYS;
6539                 spin_lock_irqsave(&q->lock, flags);
6540                 if (waiter.notified) {
6541                         spin_unlock_irqrestore(&q->lock, flags);
6542                         continue;
6543                 }
6544                 set_current_state(TASK_INTERRUPTIBLE);
6545                 spin_unlock_irqrestore(&q->lock, flags);
6546
6547                 freezable_schedule_timeout_interruptible(NFS4_LOCK_MAXTIMEOUT);
6548         }
6549
6550         finish_wait(q, &wait);
6551         return status;
6552 }
6553 #else /* !CONFIG_NFS_V4_1 */
6554 static inline int
6555 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6556 {
6557         return nfs4_retry_setlk_simple(state, cmd, request);
6558 }
6559 #endif
6560
6561 static int
6562 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6563 {
6564         struct nfs_open_context *ctx;
6565         struct nfs4_state *state;
6566         int status;
6567
6568         /* verify open state */
6569         ctx = nfs_file_open_context(filp);
6570         state = ctx->state;
6571
6572         if (request->fl_start < 0 || request->fl_end < 0)
6573                 return -EINVAL;
6574
6575         if (IS_GETLK(cmd)) {
6576                 if (state != NULL)
6577                         return nfs4_proc_getlk(state, F_GETLK, request);
6578                 return 0;
6579         }
6580
6581         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6582                 return -EINVAL;
6583
6584         if (request->fl_type == F_UNLCK) {
6585                 if (state != NULL)
6586                         return nfs4_proc_unlck(state, cmd, request);
6587                 return 0;
6588         }
6589
6590         if (state == NULL)
6591                 return -ENOLCK;
6592
6593         if ((request->fl_flags & FL_POSIX) &&
6594             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6595                 return -ENOLCK;
6596
6597         /*
6598          * Don't rely on the VFS having checked the file open mode,
6599          * since it won't do this for flock() locks.
6600          */
6601         switch (request->fl_type) {
6602         case F_RDLCK:
6603                 if (!(filp->f_mode & FMODE_READ))
6604                         return -EBADF;
6605                 break;
6606         case F_WRLCK:
6607                 if (!(filp->f_mode & FMODE_WRITE))
6608                         return -EBADF;
6609         }
6610
6611         status = nfs4_set_lock_state(state, request);
6612         if (status != 0)
6613                 return status;
6614
6615         return nfs4_retry_setlk(state, cmd, request);
6616 }
6617
6618 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6619 {
6620         struct nfs_server *server = NFS_SERVER(state->inode);
6621         int err;
6622
6623         err = nfs4_set_lock_state(state, fl);
6624         if (err != 0)
6625                 return err;
6626         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6627         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6628 }
6629
6630 struct nfs_release_lockowner_data {
6631         struct nfs4_lock_state *lsp;
6632         struct nfs_server *server;
6633         struct nfs_release_lockowner_args args;
6634         struct nfs_release_lockowner_res res;
6635         unsigned long timestamp;
6636 };
6637
6638 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6639 {
6640         struct nfs_release_lockowner_data *data = calldata;
6641         struct nfs_server *server = data->server;
6642         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6643                              &data->args.seq_args, &data->res.seq_res, task);
6644         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6645         data->timestamp = jiffies;
6646 }
6647
6648 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6649 {
6650         struct nfs_release_lockowner_data *data = calldata;
6651         struct nfs_server *server = data->server;
6652
6653         nfs40_sequence_done(task, &data->res.seq_res);
6654
6655         switch (task->tk_status) {
6656         case 0:
6657                 renew_lease(server, data->timestamp);
6658                 break;
6659         case -NFS4ERR_STALE_CLIENTID:
6660         case -NFS4ERR_EXPIRED:
6661                 nfs4_schedule_lease_recovery(server->nfs_client);
6662                 break;
6663         case -NFS4ERR_LEASE_MOVED:
6664         case -NFS4ERR_DELAY:
6665                 if (nfs4_async_handle_error(task, server,
6666                                             NULL, NULL) == -EAGAIN)
6667                         rpc_restart_call_prepare(task);
6668         }
6669 }
6670
6671 static void nfs4_release_lockowner_release(void *calldata)
6672 {
6673         struct nfs_release_lockowner_data *data = calldata;
6674         nfs4_free_lock_state(data->server, data->lsp);
6675         kfree(calldata);
6676 }
6677
6678 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6679         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6680         .rpc_call_done = nfs4_release_lockowner_done,
6681         .rpc_release = nfs4_release_lockowner_release,
6682 };
6683
6684 static void
6685 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6686 {
6687         struct nfs_release_lockowner_data *data;
6688         struct rpc_message msg = {
6689                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6690         };
6691
6692         if (server->nfs_client->cl_mvops->minor_version != 0)
6693                 return;
6694
6695         data = kmalloc(sizeof(*data), GFP_NOFS);
6696         if (!data)
6697                 return;
6698         data->lsp = lsp;
6699         data->server = server;
6700         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6701         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6702         data->args.lock_owner.s_dev = server->s_dev;
6703
6704         msg.rpc_argp = &data->args;
6705         msg.rpc_resp = &data->res;
6706         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6707         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6708 }
6709
6710 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6711
6712 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6713                                    struct dentry *unused, struct inode *inode,
6714                                    const char *key, const void *buf,
6715                                    size_t buflen, int flags)
6716 {
6717         return nfs4_proc_set_acl(inode, buf, buflen);
6718 }
6719
6720 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6721                                    struct dentry *unused, struct inode *inode,
6722                                    const char *key, void *buf, size_t buflen)
6723 {
6724         return nfs4_proc_get_acl(inode, buf, buflen);
6725 }
6726
6727 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6728 {
6729         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6730 }
6731
6732 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6733
6734 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6735                                      struct dentry *unused, struct inode *inode,
6736                                      const char *key, const void *buf,
6737                                      size_t buflen, int flags)
6738 {
6739         if (security_ismaclabel(key))
6740                 return nfs4_set_security_label(inode, buf, buflen);
6741
6742         return -EOPNOTSUPP;
6743 }
6744
6745 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6746                                      struct dentry *unused, struct inode *inode,
6747                                      const char *key, void *buf, size_t buflen)
6748 {
6749         if (security_ismaclabel(key))
6750                 return nfs4_get_security_label(inode, buf, buflen);
6751         return -EOPNOTSUPP;
6752 }
6753
6754 static ssize_t
6755 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6756 {
6757         int len = 0;
6758
6759         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6760                 len = security_inode_listsecurity(inode, list, list_len);
6761                 if (list_len && len > list_len)
6762                         return -ERANGE;
6763         }
6764         return len;
6765 }
6766
6767 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6768         .prefix = XATTR_SECURITY_PREFIX,
6769         .get    = nfs4_xattr_get_nfs4_label,
6770         .set    = nfs4_xattr_set_nfs4_label,
6771 };
6772
6773 #else
6774
6775 static ssize_t
6776 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6777 {
6778         return 0;
6779 }
6780
6781 #endif
6782
6783 /*
6784  * nfs_fhget will use either the mounted_on_fileid or the fileid
6785  */
6786 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6787 {
6788         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6789                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6790               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6791               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6792                 return;
6793
6794         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6795                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6796         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6797         fattr->nlink = 2;
6798 }
6799
6800 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6801                                    const struct qstr *name,
6802                                    struct nfs4_fs_locations *fs_locations,
6803                                    struct page *page)
6804 {
6805         struct nfs_server *server = NFS_SERVER(dir);
6806         u32 bitmask[3] = {
6807                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6808         };
6809         struct nfs4_fs_locations_arg args = {
6810                 .dir_fh = NFS_FH(dir),
6811                 .name = name,
6812                 .page = page,
6813                 .bitmask = bitmask,
6814         };
6815         struct nfs4_fs_locations_res res = {
6816                 .fs_locations = fs_locations,
6817         };
6818         struct rpc_message msg = {
6819                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6820                 .rpc_argp = &args,
6821                 .rpc_resp = &res,
6822         };
6823         int status;
6824
6825         dprintk("%s: start\n", __func__);
6826
6827         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6828          * is not supported */
6829         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6830                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6831         else
6832                 bitmask[0] |= FATTR4_WORD0_FILEID;
6833
6834         nfs_fattr_init(&fs_locations->fattr);
6835         fs_locations->server = server;
6836         fs_locations->nlocations = 0;
6837         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6838         dprintk("%s: returned status = %d\n", __func__, status);
6839         return status;
6840 }
6841
6842 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6843                            const struct qstr *name,
6844                            struct nfs4_fs_locations *fs_locations,
6845                            struct page *page)
6846 {
6847         struct nfs4_exception exception = { };
6848         int err;
6849         do {
6850                 err = _nfs4_proc_fs_locations(client, dir, name,
6851                                 fs_locations, page);
6852                 trace_nfs4_get_fs_locations(dir, name, err);
6853                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6854                                 &exception);
6855         } while (exception.retry);
6856         return err;
6857 }
6858
6859 /*
6860  * This operation also signals the server that this client is
6861  * performing migration recovery.  The server can stop returning
6862  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6863  * appended to this compound to identify the client ID which is
6864  * performing recovery.
6865  */
6866 static int _nfs40_proc_get_locations(struct inode *inode,
6867                                      struct nfs4_fs_locations *locations,
6868                                      struct page *page, struct rpc_cred *cred)
6869 {
6870         struct nfs_server *server = NFS_SERVER(inode);
6871         struct rpc_clnt *clnt = server->client;
6872         u32 bitmask[2] = {
6873                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6874         };
6875         struct nfs4_fs_locations_arg args = {
6876                 .clientid       = server->nfs_client->cl_clientid,
6877                 .fh             = NFS_FH(inode),
6878                 .page           = page,
6879                 .bitmask        = bitmask,
6880                 .migration      = 1,            /* skip LOOKUP */
6881                 .renew          = 1,            /* append RENEW */
6882         };
6883         struct nfs4_fs_locations_res res = {
6884                 .fs_locations   = locations,
6885                 .migration      = 1,
6886                 .renew          = 1,
6887         };
6888         struct rpc_message msg = {
6889                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6890                 .rpc_argp       = &args,
6891                 .rpc_resp       = &res,
6892                 .rpc_cred       = cred,
6893         };
6894         unsigned long now = jiffies;
6895         int status;
6896
6897         nfs_fattr_init(&locations->fattr);
6898         locations->server = server;
6899         locations->nlocations = 0;
6900
6901         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6902         nfs4_set_sequence_privileged(&args.seq_args);
6903         status = nfs4_call_sync_sequence(clnt, server, &msg,
6904                                         &args.seq_args, &res.seq_res);
6905         if (status)
6906                 return status;
6907
6908         renew_lease(server, now);
6909         return 0;
6910 }
6911
6912 #ifdef CONFIG_NFS_V4_1
6913
6914 /*
6915  * This operation also signals the server that this client is
6916  * performing migration recovery.  The server can stop asserting
6917  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6918  * performing this operation is identified in the SEQUENCE
6919  * operation in this compound.
6920  *
6921  * When the client supports GETATTR(fs_locations_info), it can
6922  * be plumbed in here.
6923  */
6924 static int _nfs41_proc_get_locations(struct inode *inode,
6925                                      struct nfs4_fs_locations *locations,
6926                                      struct page *page, struct rpc_cred *cred)
6927 {
6928         struct nfs_server *server = NFS_SERVER(inode);
6929         struct rpc_clnt *clnt = server->client;
6930         u32 bitmask[2] = {
6931                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6932         };
6933         struct nfs4_fs_locations_arg args = {
6934                 .fh             = NFS_FH(inode),
6935                 .page           = page,
6936                 .bitmask        = bitmask,
6937                 .migration      = 1,            /* skip LOOKUP */
6938         };
6939         struct nfs4_fs_locations_res res = {
6940                 .fs_locations   = locations,
6941                 .migration      = 1,
6942         };
6943         struct rpc_message msg = {
6944                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6945                 .rpc_argp       = &args,
6946                 .rpc_resp       = &res,
6947                 .rpc_cred       = cred,
6948         };
6949         int status;
6950
6951         nfs_fattr_init(&locations->fattr);
6952         locations->server = server;
6953         locations->nlocations = 0;
6954
6955         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6956         nfs4_set_sequence_privileged(&args.seq_args);
6957         status = nfs4_call_sync_sequence(clnt, server, &msg,
6958                                         &args.seq_args, &res.seq_res);
6959         if (status == NFS4_OK &&
6960             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6961                 status = -NFS4ERR_LEASE_MOVED;
6962         return status;
6963 }
6964
6965 #endif  /* CONFIG_NFS_V4_1 */
6966
6967 /**
6968  * nfs4_proc_get_locations - discover locations for a migrated FSID
6969  * @inode: inode on FSID that is migrating
6970  * @locations: result of query
6971  * @page: buffer
6972  * @cred: credential to use for this operation
6973  *
6974  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6975  * operation failed, or a negative errno if a local error occurred.
6976  *
6977  * On success, "locations" is filled in, but if the server has
6978  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6979  * asserted.
6980  *
6981  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6982  * from this client that require migration recovery.
6983  */
6984 int nfs4_proc_get_locations(struct inode *inode,
6985                             struct nfs4_fs_locations *locations,
6986                             struct page *page, struct rpc_cred *cred)
6987 {
6988         struct nfs_server *server = NFS_SERVER(inode);
6989         struct nfs_client *clp = server->nfs_client;
6990         const struct nfs4_mig_recovery_ops *ops =
6991                                         clp->cl_mvops->mig_recovery_ops;
6992         struct nfs4_exception exception = { };
6993         int status;
6994
6995         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6996                 (unsigned long long)server->fsid.major,
6997                 (unsigned long long)server->fsid.minor,
6998                 clp->cl_hostname);
6999         nfs_display_fhandle(NFS_FH(inode), __func__);
7000
7001         do {
7002                 status = ops->get_locations(inode, locations, page, cred);
7003                 if (status != -NFS4ERR_DELAY)
7004                         break;
7005                 nfs4_handle_exception(server, status, &exception);
7006         } while (exception.retry);
7007         return status;
7008 }
7009
7010 /*
7011  * This operation also signals the server that this client is
7012  * performing "lease moved" recovery.  The server can stop
7013  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
7014  * is appended to this compound to identify the client ID which is
7015  * performing recovery.
7016  */
7017 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
7018 {
7019         struct nfs_server *server = NFS_SERVER(inode);
7020         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7021         struct rpc_clnt *clnt = server->client;
7022         struct nfs4_fsid_present_arg args = {
7023                 .fh             = NFS_FH(inode),
7024                 .clientid       = clp->cl_clientid,
7025                 .renew          = 1,            /* append RENEW */
7026         };
7027         struct nfs4_fsid_present_res res = {
7028                 .renew          = 1,
7029         };
7030         struct rpc_message msg = {
7031                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7032                 .rpc_argp       = &args,
7033                 .rpc_resp       = &res,
7034                 .rpc_cred       = cred,
7035         };
7036         unsigned long now = jiffies;
7037         int status;
7038
7039         res.fh = nfs_alloc_fhandle();
7040         if (res.fh == NULL)
7041                 return -ENOMEM;
7042
7043         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7044         nfs4_set_sequence_privileged(&args.seq_args);
7045         status = nfs4_call_sync_sequence(clnt, server, &msg,
7046                                                 &args.seq_args, &res.seq_res);
7047         nfs_free_fhandle(res.fh);
7048         if (status)
7049                 return status;
7050
7051         do_renew_lease(clp, now);
7052         return 0;
7053 }
7054
7055 #ifdef CONFIG_NFS_V4_1
7056
7057 /*
7058  * This operation also signals the server that this client is
7059  * performing "lease moved" recovery.  The server can stop asserting
7060  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
7061  * this operation is identified in the SEQUENCE operation in this
7062  * compound.
7063  */
7064 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
7065 {
7066         struct nfs_server *server = NFS_SERVER(inode);
7067         struct rpc_clnt *clnt = server->client;
7068         struct nfs4_fsid_present_arg args = {
7069                 .fh             = NFS_FH(inode),
7070         };
7071         struct nfs4_fsid_present_res res = {
7072         };
7073         struct rpc_message msg = {
7074                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7075                 .rpc_argp       = &args,
7076                 .rpc_resp       = &res,
7077                 .rpc_cred       = cred,
7078         };
7079         int status;
7080
7081         res.fh = nfs_alloc_fhandle();
7082         if (res.fh == NULL)
7083                 return -ENOMEM;
7084
7085         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7086         nfs4_set_sequence_privileged(&args.seq_args);
7087         status = nfs4_call_sync_sequence(clnt, server, &msg,
7088                                                 &args.seq_args, &res.seq_res);
7089         nfs_free_fhandle(res.fh);
7090         if (status == NFS4_OK &&
7091             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7092                 status = -NFS4ERR_LEASE_MOVED;
7093         return status;
7094 }
7095
7096 #endif  /* CONFIG_NFS_V4_1 */
7097
7098 /**
7099  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
7100  * @inode: inode on FSID to check
7101  * @cred: credential to use for this operation
7102  *
7103  * Server indicates whether the FSID is present, moved, or not
7104  * recognized.  This operation is necessary to clear a LEASE_MOVED
7105  * condition for this client ID.
7106  *
7107  * Returns NFS4_OK if the FSID is present on this server,
7108  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
7109  *  NFS4ERR code if some error occurred on the server, or a
7110  *  negative errno if a local failure occurred.
7111  */
7112 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
7113 {
7114         struct nfs_server *server = NFS_SERVER(inode);
7115         struct nfs_client *clp = server->nfs_client;
7116         const struct nfs4_mig_recovery_ops *ops =
7117                                         clp->cl_mvops->mig_recovery_ops;
7118         struct nfs4_exception exception = { };
7119         int status;
7120
7121         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7122                 (unsigned long long)server->fsid.major,
7123                 (unsigned long long)server->fsid.minor,
7124                 clp->cl_hostname);
7125         nfs_display_fhandle(NFS_FH(inode), __func__);
7126
7127         do {
7128                 status = ops->fsid_present(inode, cred);
7129                 if (status != -NFS4ERR_DELAY)
7130                         break;
7131                 nfs4_handle_exception(server, status, &exception);
7132         } while (exception.retry);
7133         return status;
7134 }
7135
7136 /**
7137  * If 'use_integrity' is true and the state managment nfs_client
7138  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
7139  * and the machine credential as per RFC3530bis and RFC5661 Security
7140  * Considerations sections. Otherwise, just use the user cred with the
7141  * filesystem's rpc_client.
7142  */
7143 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7144 {
7145         int status;
7146         struct nfs4_secinfo_arg args = {
7147                 .dir_fh = NFS_FH(dir),
7148                 .name   = name,
7149         };
7150         struct nfs4_secinfo_res res = {
7151                 .flavors     = flavors,
7152         };
7153         struct rpc_message msg = {
7154                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
7155                 .rpc_argp = &args,
7156                 .rpc_resp = &res,
7157         };
7158         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
7159         struct rpc_cred *cred = NULL;
7160
7161         if (use_integrity) {
7162                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
7163                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
7164                 msg.rpc_cred = cred;
7165         }
7166
7167         dprintk("NFS call  secinfo %s\n", name->name);
7168
7169         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
7170                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
7171
7172         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
7173                                 &res.seq_res, 0);
7174         dprintk("NFS reply  secinfo: %d\n", status);
7175
7176         if (cred)
7177                 put_rpccred(cred);
7178
7179         return status;
7180 }
7181
7182 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
7183                       struct nfs4_secinfo_flavors *flavors)
7184 {
7185         struct nfs4_exception exception = { };
7186         int err;
7187         do {
7188                 err = -NFS4ERR_WRONGSEC;
7189
7190                 /* try to use integrity protection with machine cred */
7191                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
7192                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
7193
7194                 /*
7195                  * if unable to use integrity protection, or SECINFO with
7196                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7197                  * disallowed by spec, but exists in deployed servers) use
7198                  * the current filesystem's rpc_client and the user cred.
7199                  */
7200                 if (err == -NFS4ERR_WRONGSEC)
7201                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
7202
7203                 trace_nfs4_secinfo(dir, name, err);
7204                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7205                                 &exception);
7206         } while (exception.retry);
7207         return err;
7208 }
7209
7210 #ifdef CONFIG_NFS_V4_1
7211 /*
7212  * Check the exchange flags returned by the server for invalid flags, having
7213  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
7214  * DS flags set.
7215  */
7216 static int nfs4_check_cl_exchange_flags(u32 flags)
7217 {
7218         if (flags & ~EXCHGID4_FLAG_MASK_R)
7219                 goto out_inval;
7220         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
7221             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
7222                 goto out_inval;
7223         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
7224                 goto out_inval;
7225         return NFS_OK;
7226 out_inval:
7227         return -NFS4ERR_INVAL;
7228 }
7229
7230 static bool
7231 nfs41_same_server_scope(struct nfs41_server_scope *a,
7232                         struct nfs41_server_scope *b)
7233 {
7234         if (a->server_scope_sz == b->server_scope_sz &&
7235             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
7236                 return true;
7237
7238         return false;
7239 }
7240
7241 static void
7242 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
7243 {
7244 }
7245
7246 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
7247         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
7248 };
7249
7250 /*
7251  * nfs4_proc_bind_one_conn_to_session()
7252  *
7253  * The 4.1 client currently uses the same TCP connection for the
7254  * fore and backchannel.
7255  */
7256 static
7257 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
7258                 struct rpc_xprt *xprt,
7259                 struct nfs_client *clp,
7260                 struct rpc_cred *cred)
7261 {
7262         int status;
7263         struct nfs41_bind_conn_to_session_args args = {
7264                 .client = clp,
7265                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
7266         };
7267         struct nfs41_bind_conn_to_session_res res;
7268         struct rpc_message msg = {
7269                 .rpc_proc =
7270                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
7271                 .rpc_argp = &args,
7272                 .rpc_resp = &res,
7273                 .rpc_cred = cred,
7274         };
7275         struct rpc_task_setup task_setup_data = {
7276                 .rpc_client = clnt,
7277                 .rpc_xprt = xprt,
7278                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
7279                 .rpc_message = &msg,
7280                 .flags = RPC_TASK_TIMEOUT,
7281         };
7282         struct rpc_task *task;
7283
7284         dprintk("--> %s\n", __func__);
7285
7286         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
7287         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
7288                 args.dir = NFS4_CDFC4_FORE;
7289
7290         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
7291         if (xprt != rcu_access_pointer(clnt->cl_xprt))
7292                 args.dir = NFS4_CDFC4_FORE;
7293
7294         task = rpc_run_task(&task_setup_data);
7295         if (!IS_ERR(task)) {
7296                 status = task->tk_status;
7297                 rpc_put_task(task);
7298         } else
7299                 status = PTR_ERR(task);
7300         trace_nfs4_bind_conn_to_session(clp, status);
7301         if (status == 0) {
7302                 if (memcmp(res.sessionid.data,
7303                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
7304                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
7305                         status = -EIO;
7306                         goto out;
7307                 }
7308                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
7309                         dprintk("NFS: %s: Unexpected direction from server\n",
7310                                 __func__);
7311                         status = -EIO;
7312                         goto out;
7313                 }
7314                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
7315                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
7316                                 __func__);
7317                         status = -EIO;
7318                         goto out;
7319                 }
7320         }
7321 out:
7322         dprintk("<-- %s status= %d\n", __func__, status);
7323         return status;
7324 }
7325
7326 struct rpc_bind_conn_calldata {
7327         struct nfs_client *clp;
7328         struct rpc_cred *cred;
7329 };
7330
7331 static int
7332 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
7333                 struct rpc_xprt *xprt,
7334                 void *calldata)
7335 {
7336         struct rpc_bind_conn_calldata *p = calldata;
7337
7338         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
7339 }
7340
7341 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
7342 {
7343         struct rpc_bind_conn_calldata data = {
7344                 .clp = clp,
7345                 .cred = cred,
7346         };
7347         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
7348                         nfs4_proc_bind_conn_to_session_callback, &data);
7349 }
7350
7351 /*
7352  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
7353  * and operations we'd like to see to enable certain features in the allow map
7354  */
7355 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
7356         .how = SP4_MACH_CRED,
7357         .enforce.u.words = {
7358                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7359                       1 << (OP_EXCHANGE_ID - 32) |
7360                       1 << (OP_CREATE_SESSION - 32) |
7361                       1 << (OP_DESTROY_SESSION - 32) |
7362                       1 << (OP_DESTROY_CLIENTID - 32)
7363         },
7364         .allow.u.words = {
7365                 [0] = 1 << (OP_CLOSE) |
7366                       1 << (OP_OPEN_DOWNGRADE) |
7367                       1 << (OP_LOCKU) |
7368                       1 << (OP_DELEGRETURN) |
7369                       1 << (OP_COMMIT),
7370                 [1] = 1 << (OP_SECINFO - 32) |
7371                       1 << (OP_SECINFO_NO_NAME - 32) |
7372                       1 << (OP_LAYOUTRETURN - 32) |
7373                       1 << (OP_TEST_STATEID - 32) |
7374                       1 << (OP_FREE_STATEID - 32) |
7375                       1 << (OP_WRITE - 32)
7376         }
7377 };
7378
7379 /*
7380  * Select the state protection mode for client `clp' given the server results
7381  * from exchange_id in `sp'.
7382  *
7383  * Returns 0 on success, negative errno otherwise.
7384  */
7385 static int nfs4_sp4_select_mode(struct nfs_client *clp,
7386                                  struct nfs41_state_protection *sp)
7387 {
7388         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
7389                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7390                       1 << (OP_EXCHANGE_ID - 32) |
7391                       1 << (OP_CREATE_SESSION - 32) |
7392                       1 << (OP_DESTROY_SESSION - 32) |
7393                       1 << (OP_DESTROY_CLIENTID - 32)
7394         };
7395         unsigned int i;
7396
7397         if (sp->how == SP4_MACH_CRED) {
7398                 /* Print state protect result */
7399                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
7400                 for (i = 0; i <= LAST_NFS4_OP; i++) {
7401                         if (test_bit(i, sp->enforce.u.longs))
7402                                 dfprintk(MOUNT, "  enforce op %d\n", i);
7403                         if (test_bit(i, sp->allow.u.longs))
7404                                 dfprintk(MOUNT, "  allow op %d\n", i);
7405                 }
7406
7407                 /* make sure nothing is on enforce list that isn't supported */
7408                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
7409                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
7410                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7411                                 return -EINVAL;
7412                         }
7413                 }
7414
7415                 /*
7416                  * Minimal mode - state operations are allowed to use machine
7417                  * credential.  Note this already happens by default, so the
7418                  * client doesn't have to do anything more than the negotiation.
7419                  *
7420                  * NOTE: we don't care if EXCHANGE_ID is in the list -
7421                  *       we're already using the machine cred for exchange_id
7422                  *       and will never use a different cred.
7423                  */
7424                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
7425                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
7426                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
7427                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
7428                         dfprintk(MOUNT, "sp4_mach_cred:\n");
7429                         dfprintk(MOUNT, "  minimal mode enabled\n");
7430                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
7431                 } else {
7432                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7433                         return -EINVAL;
7434                 }
7435
7436                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7437                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7438                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7439                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
7440                         dfprintk(MOUNT, "  cleanup mode enabled\n");
7441                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
7442                 }
7443
7444                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7445                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
7446                         set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
7447                                 &clp->cl_sp4_flags);
7448                 }
7449
7450                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7451                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7452                         dfprintk(MOUNT, "  secinfo mode enabled\n");
7453                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
7454                 }
7455
7456                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7457                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7458                         dfprintk(MOUNT, "  stateid mode enabled\n");
7459                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
7460                 }
7461
7462                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7463                         dfprintk(MOUNT, "  write mode enabled\n");
7464                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
7465                 }
7466
7467                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7468                         dfprintk(MOUNT, "  commit mode enabled\n");
7469                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
7470                 }
7471         }
7472
7473         return 0;
7474 }
7475
7476 struct nfs41_exchange_id_data {
7477         struct nfs41_exchange_id_res res;
7478         struct nfs41_exchange_id_args args;
7479         struct rpc_xprt *xprt;
7480         int rpc_status;
7481 };
7482
7483 static void nfs4_exchange_id_done(struct rpc_task *task, void *data)
7484 {
7485         struct nfs41_exchange_id_data *cdata =
7486                                         (struct nfs41_exchange_id_data *)data;
7487         struct nfs_client *clp = cdata->args.client;
7488         int status = task->tk_status;
7489
7490         trace_nfs4_exchange_id(clp, status);
7491
7492         if (status == 0)
7493                 status = nfs4_check_cl_exchange_flags(cdata->res.flags);
7494
7495         if (cdata->xprt && status == 0) {
7496                 status = nfs4_detect_session_trunking(clp, &cdata->res,
7497                                                       cdata->xprt);
7498                 goto out;
7499         }
7500
7501         if (status  == 0)
7502                 status = nfs4_sp4_select_mode(clp, &cdata->res.state_protect);
7503
7504         if (status == 0) {
7505                 clp->cl_clientid = cdata->res.clientid;
7506                 clp->cl_exchange_flags = cdata->res.flags;
7507                 /* Client ID is not confirmed */
7508                 if (!(cdata->res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7509                         clear_bit(NFS4_SESSION_ESTABLISHED,
7510                         &clp->cl_session->session_state);
7511                         clp->cl_seqid = cdata->res.seqid;
7512                 }
7513
7514                 kfree(clp->cl_serverowner);
7515                 clp->cl_serverowner = cdata->res.server_owner;
7516                 cdata->res.server_owner = NULL;
7517
7518                 /* use the most recent implementation id */
7519                 kfree(clp->cl_implid);
7520                 clp->cl_implid = cdata->res.impl_id;
7521                 cdata->res.impl_id = NULL;
7522
7523                 if (clp->cl_serverscope != NULL &&
7524                     !nfs41_same_server_scope(clp->cl_serverscope,
7525                                         cdata->res.server_scope)) {
7526                         dprintk("%s: server_scope mismatch detected\n",
7527                                 __func__);
7528                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7529                         kfree(clp->cl_serverscope);
7530                         clp->cl_serverscope = NULL;
7531                 }
7532
7533                 if (clp->cl_serverscope == NULL) {
7534                         clp->cl_serverscope = cdata->res.server_scope;
7535                         cdata->res.server_scope = NULL;
7536                 }
7537                 /* Save the EXCHANGE_ID verifier session trunk tests */
7538                 memcpy(clp->cl_confirm.data, cdata->args.verifier->data,
7539                        sizeof(clp->cl_confirm.data));
7540         }
7541 out:
7542         cdata->rpc_status = status;
7543         return;
7544 }
7545
7546 static void nfs4_exchange_id_release(void *data)
7547 {
7548         struct nfs41_exchange_id_data *cdata =
7549                                         (struct nfs41_exchange_id_data *)data;
7550
7551         nfs_put_client(cdata->args.client);
7552         if (cdata->xprt) {
7553                 xprt_put(cdata->xprt);
7554                 rpc_clnt_xprt_switch_put(cdata->args.client->cl_rpcclient);
7555         }
7556         kfree(cdata->res.impl_id);
7557         kfree(cdata->res.server_scope);
7558         kfree(cdata->res.server_owner);
7559         kfree(cdata);
7560 }
7561
7562 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
7563         .rpc_call_done = nfs4_exchange_id_done,
7564         .rpc_release = nfs4_exchange_id_release,
7565 };
7566
7567 /*
7568  * _nfs4_proc_exchange_id()
7569  *
7570  * Wrapper for EXCHANGE_ID operation.
7571  */
7572 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7573                         u32 sp4_how, struct rpc_xprt *xprt)
7574 {
7575         nfs4_verifier verifier;
7576         struct rpc_message msg = {
7577                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7578                 .rpc_cred = cred,
7579         };
7580         struct rpc_task_setup task_setup_data = {
7581                 .rpc_client = clp->cl_rpcclient,
7582                 .callback_ops = &nfs4_exchange_id_call_ops,
7583                 .rpc_message = &msg,
7584                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7585         };
7586         struct nfs41_exchange_id_data *calldata;
7587         struct rpc_task *task;
7588         int status = -EIO;
7589
7590         if (!atomic_inc_not_zero(&clp->cl_count))
7591                 goto out;
7592
7593         status = -ENOMEM;
7594         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7595         if (!calldata)
7596                 goto out;
7597
7598         if (!xprt)
7599                 nfs4_init_boot_verifier(clp, &verifier);
7600
7601         status = nfs4_init_uniform_client_string(clp);
7602         if (status)
7603                 goto out_calldata;
7604
7605         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
7606                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
7607                 clp->cl_owner_id);
7608
7609         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
7610                                                 GFP_NOFS);
7611         status = -ENOMEM;
7612         if (unlikely(calldata->res.server_owner == NULL))
7613                 goto out_calldata;
7614
7615         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7616                                         GFP_NOFS);
7617         if (unlikely(calldata->res.server_scope == NULL))
7618                 goto out_server_owner;
7619
7620         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7621         if (unlikely(calldata->res.impl_id == NULL))
7622                 goto out_server_scope;
7623
7624         switch (sp4_how) {
7625         case SP4_NONE:
7626                 calldata->args.state_protect.how = SP4_NONE;
7627                 break;
7628
7629         case SP4_MACH_CRED:
7630                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
7631                 break;
7632
7633         default:
7634                 /* unsupported! */
7635                 WARN_ON_ONCE(1);
7636                 status = -EINVAL;
7637                 goto out_impl_id;
7638         }
7639         if (xprt) {
7640                 calldata->xprt = xprt;
7641                 task_setup_data.rpc_xprt = xprt;
7642                 task_setup_data.flags =
7643                                 RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC;
7644                 calldata->args.verifier = &clp->cl_confirm;
7645         } else {
7646                 calldata->args.verifier = &verifier;
7647         }
7648         calldata->args.client = clp;
7649 #ifdef CONFIG_NFS_V4_1_MIGRATION
7650         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7651         EXCHGID4_FLAG_BIND_PRINC_STATEID |
7652         EXCHGID4_FLAG_SUPP_MOVED_MIGR,
7653 #else
7654         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7655         EXCHGID4_FLAG_BIND_PRINC_STATEID,
7656 #endif
7657         msg.rpc_argp = &calldata->args;
7658         msg.rpc_resp = &calldata->res;
7659         task_setup_data.callback_data = calldata;
7660
7661         task = rpc_run_task(&task_setup_data);
7662         if (IS_ERR(task)) {
7663         status = PTR_ERR(task);
7664                 goto out_impl_id;
7665         }
7666
7667         if (!xprt) {
7668                 status = rpc_wait_for_completion_task(task);
7669                 if (!status)
7670                         status = calldata->rpc_status;
7671         } else  /* session trunking test */
7672                 status = calldata->rpc_status;
7673
7674         rpc_put_task(task);
7675 out:
7676         if (clp->cl_implid != NULL)
7677                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7678                         "domain: %s, name: %s, date: %llu,%u\n",
7679                         clp->cl_implid->domain, clp->cl_implid->name,
7680                         clp->cl_implid->date.seconds,
7681                         clp->cl_implid->date.nseconds);
7682         dprintk("NFS reply exchange_id: %d\n", status);
7683         return status;
7684
7685 out_impl_id:
7686         kfree(calldata->res.impl_id);
7687 out_server_scope:
7688         kfree(calldata->res.server_scope);
7689 out_server_owner:
7690         kfree(calldata->res.server_owner);
7691 out_calldata:
7692         kfree(calldata);
7693         goto out;
7694 }
7695
7696 /*
7697  * nfs4_proc_exchange_id()
7698  *
7699  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7700  *
7701  * Since the clientid has expired, all compounds using sessions
7702  * associated with the stale clientid will be returning
7703  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7704  * be in some phase of session reset.
7705  *
7706  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7707  */
7708 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7709 {
7710         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7711         int status;
7712
7713         /* try SP4_MACH_CRED if krb5i/p */
7714         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7715             authflavor == RPC_AUTH_GSS_KRB5P) {
7716                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED, NULL);
7717                 if (!status)
7718                         return 0;
7719         }
7720
7721         /* try SP4_NONE */
7722         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE, NULL);
7723 }
7724
7725 /**
7726  * nfs4_test_session_trunk
7727  *
7728  * This is an add_xprt_test() test function called from
7729  * rpc_clnt_setup_test_and_add_xprt.
7730  *
7731  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
7732  * and is dereferrenced in nfs4_exchange_id_release
7733  *
7734  * Upon success, add the new transport to the rpc_clnt
7735  *
7736  * @clnt: struct rpc_clnt to get new transport
7737  * @xprt: the rpc_xprt to test
7738  * @data: call data for _nfs4_proc_exchange_id.
7739  */
7740 int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
7741                             void *data)
7742 {
7743         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
7744         u32 sp4_how;
7745
7746         dprintk("--> %s try %s\n", __func__,
7747                 xprt->address_strings[RPC_DISPLAY_ADDR]);
7748
7749         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
7750
7751         /* Test connection for session trunking. Async exchange_id call */
7752         return  _nfs4_proc_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
7753 }
7754 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
7755
7756 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7757                 struct rpc_cred *cred)
7758 {
7759         struct rpc_message msg = {
7760                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7761                 .rpc_argp = clp,
7762                 .rpc_cred = cred,
7763         };
7764         int status;
7765
7766         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7767         trace_nfs4_destroy_clientid(clp, status);
7768         if (status)
7769                 dprintk("NFS: Got error %d from the server %s on "
7770                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7771         return status;
7772 }
7773
7774 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7775                 struct rpc_cred *cred)
7776 {
7777         unsigned int loop;
7778         int ret;
7779
7780         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7781                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7782                 switch (ret) {
7783                 case -NFS4ERR_DELAY:
7784                 case -NFS4ERR_CLIENTID_BUSY:
7785                         ssleep(1);
7786                         break;
7787                 default:
7788                         return ret;
7789                 }
7790         }
7791         return 0;
7792 }
7793
7794 int nfs4_destroy_clientid(struct nfs_client *clp)
7795 {
7796         struct rpc_cred *cred;
7797         int ret = 0;
7798
7799         if (clp->cl_mvops->minor_version < 1)
7800                 goto out;
7801         if (clp->cl_exchange_flags == 0)
7802                 goto out;
7803         if (clp->cl_preserve_clid)
7804                 goto out;
7805         cred = nfs4_get_clid_cred(clp);
7806         ret = nfs4_proc_destroy_clientid(clp, cred);
7807         if (cred)
7808                 put_rpccred(cred);
7809         switch (ret) {
7810         case 0:
7811         case -NFS4ERR_STALE_CLIENTID:
7812                 clp->cl_exchange_flags = 0;
7813         }
7814 out:
7815         return ret;
7816 }
7817
7818 struct nfs4_get_lease_time_data {
7819         struct nfs4_get_lease_time_args *args;
7820         struct nfs4_get_lease_time_res *res;
7821         struct nfs_client *clp;
7822 };
7823
7824 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7825                                         void *calldata)
7826 {
7827         struct nfs4_get_lease_time_data *data =
7828                         (struct nfs4_get_lease_time_data *)calldata;
7829
7830         dprintk("--> %s\n", __func__);
7831         /* just setup sequence, do not trigger session recovery
7832            since we're invoked within one */
7833         nfs41_setup_sequence(data->clp->cl_session,
7834                         &data->args->la_seq_args,
7835                         &data->res->lr_seq_res,
7836                         task);
7837         dprintk("<-- %s\n", __func__);
7838 }
7839
7840 /*
7841  * Called from nfs4_state_manager thread for session setup, so don't recover
7842  * from sequence operation or clientid errors.
7843  */
7844 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7845 {
7846         struct nfs4_get_lease_time_data *data =
7847                         (struct nfs4_get_lease_time_data *)calldata;
7848
7849         dprintk("--> %s\n", __func__);
7850         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7851                 return;
7852         switch (task->tk_status) {
7853         case -NFS4ERR_DELAY:
7854         case -NFS4ERR_GRACE:
7855                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7856                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7857                 task->tk_status = 0;
7858                 /* fall through */
7859         case -NFS4ERR_RETRY_UNCACHED_REP:
7860                 rpc_restart_call_prepare(task);
7861                 return;
7862         }
7863         dprintk("<-- %s\n", __func__);
7864 }
7865
7866 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7867         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7868         .rpc_call_done = nfs4_get_lease_time_done,
7869 };
7870
7871 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7872 {
7873         struct rpc_task *task;
7874         struct nfs4_get_lease_time_args args;
7875         struct nfs4_get_lease_time_res res = {
7876                 .lr_fsinfo = fsinfo,
7877         };
7878         struct nfs4_get_lease_time_data data = {
7879                 .args = &args,
7880                 .res = &res,
7881                 .clp = clp,
7882         };
7883         struct rpc_message msg = {
7884                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7885                 .rpc_argp = &args,
7886                 .rpc_resp = &res,
7887         };
7888         struct rpc_task_setup task_setup = {
7889                 .rpc_client = clp->cl_rpcclient,
7890                 .rpc_message = &msg,
7891                 .callback_ops = &nfs4_get_lease_time_ops,
7892                 .callback_data = &data,
7893                 .flags = RPC_TASK_TIMEOUT,
7894         };
7895         int status;
7896
7897         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7898         nfs4_set_sequence_privileged(&args.la_seq_args);
7899         dprintk("--> %s\n", __func__);
7900         task = rpc_run_task(&task_setup);
7901
7902         if (IS_ERR(task))
7903                 status = PTR_ERR(task);
7904         else {
7905                 status = task->tk_status;
7906                 rpc_put_task(task);
7907         }
7908         dprintk("<-- %s return %d\n", __func__, status);
7909
7910         return status;
7911 }
7912
7913 /*
7914  * Initialize the values to be used by the client in CREATE_SESSION
7915  * If nfs4_init_session set the fore channel request and response sizes,
7916  * use them.
7917  *
7918  * Set the back channel max_resp_sz_cached to zero to force the client to
7919  * always set csa_cachethis to FALSE because the current implementation
7920  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7921  */
7922 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
7923                                     struct rpc_clnt *clnt)
7924 {
7925         unsigned int max_rqst_sz, max_resp_sz;
7926         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
7927
7928         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7929         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7930
7931         /* Fore channel attributes */
7932         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7933         args->fc_attrs.max_resp_sz = max_resp_sz;
7934         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7935         args->fc_attrs.max_reqs = max_session_slots;
7936
7937         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7938                 "max_ops=%u max_reqs=%u\n",
7939                 __func__,
7940                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7941                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7942
7943         /* Back channel attributes */
7944         args->bc_attrs.max_rqst_sz = max_bc_payload;
7945         args->bc_attrs.max_resp_sz = max_bc_payload;
7946         args->bc_attrs.max_resp_sz_cached = 0;
7947         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7948         args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1);
7949
7950         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7951                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7952                 __func__,
7953                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7954                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7955                 args->bc_attrs.max_reqs);
7956 }
7957
7958 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7959                 struct nfs41_create_session_res *res)
7960 {
7961         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7962         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7963
7964         if (rcvd->max_resp_sz > sent->max_resp_sz)
7965                 return -EINVAL;
7966         /*
7967          * Our requested max_ops is the minimum we need; we're not
7968          * prepared to break up compounds into smaller pieces than that.
7969          * So, no point even trying to continue if the server won't
7970          * cooperate:
7971          */
7972         if (rcvd->max_ops < sent->max_ops)
7973                 return -EINVAL;
7974         if (rcvd->max_reqs == 0)
7975                 return -EINVAL;
7976         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7977                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7978         return 0;
7979 }
7980
7981 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7982                 struct nfs41_create_session_res *res)
7983 {
7984         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7985         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7986
7987         if (!(res->flags & SESSION4_BACK_CHAN))
7988                 goto out;
7989         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7990                 return -EINVAL;
7991         if (rcvd->max_resp_sz < sent->max_resp_sz)
7992                 return -EINVAL;
7993         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7994                 return -EINVAL;
7995         if (rcvd->max_ops > sent->max_ops)
7996                 return -EINVAL;
7997         if (rcvd->max_reqs > sent->max_reqs)
7998                 return -EINVAL;
7999 out:
8000         return 0;
8001 }
8002
8003 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8004                                      struct nfs41_create_session_res *res)
8005 {
8006         int ret;
8007
8008         ret = nfs4_verify_fore_channel_attrs(args, res);
8009         if (ret)
8010                 return ret;
8011         return nfs4_verify_back_channel_attrs(args, res);
8012 }
8013
8014 static void nfs4_update_session(struct nfs4_session *session,
8015                 struct nfs41_create_session_res *res)
8016 {
8017         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8018         /* Mark client id and session as being confirmed */
8019         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8020         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8021         session->flags = res->flags;
8022         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8023         if (res->flags & SESSION4_BACK_CHAN)
8024                 memcpy(&session->bc_attrs, &res->bc_attrs,
8025                                 sizeof(session->bc_attrs));
8026 }
8027
8028 static int _nfs4_proc_create_session(struct nfs_client *clp,
8029                 struct rpc_cred *cred)
8030 {
8031         struct nfs4_session *session = clp->cl_session;
8032         struct nfs41_create_session_args args = {
8033                 .client = clp,
8034                 .clientid = clp->cl_clientid,
8035                 .seqid = clp->cl_seqid,
8036                 .cb_program = NFS4_CALLBACK,
8037         };
8038         struct nfs41_create_session_res res;
8039
8040         struct rpc_message msg = {
8041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8042                 .rpc_argp = &args,
8043                 .rpc_resp = &res,
8044                 .rpc_cred = cred,
8045         };
8046         int status;
8047
8048         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8049         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8050
8051         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
8052         trace_nfs4_create_session(clp, status);
8053
8054         switch (status) {
8055         case -NFS4ERR_STALE_CLIENTID:
8056         case -NFS4ERR_DELAY:
8057         case -ETIMEDOUT:
8058         case -EACCES:
8059         case -EAGAIN:
8060                 goto out;
8061         };
8062
8063         clp->cl_seqid++;
8064         if (!status) {
8065                 /* Verify the session's negotiated channel_attrs values */
8066                 status = nfs4_verify_channel_attrs(&args, &res);
8067                 /* Increment the clientid slot sequence id */
8068                 if (status)
8069                         goto out;
8070                 nfs4_update_session(session, &res);
8071         }
8072 out:
8073         return status;
8074 }
8075
8076 /*
8077  * Issues a CREATE_SESSION operation to the server.
8078  * It is the responsibility of the caller to verify the session is
8079  * expired before calling this routine.
8080  */
8081 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
8082 {
8083         int status;
8084         unsigned *ptr;
8085         struct nfs4_session *session = clp->cl_session;
8086
8087         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
8088
8089         status = _nfs4_proc_create_session(clp, cred);
8090         if (status)
8091                 goto out;
8092
8093         /* Init or reset the session slot tables */
8094         status = nfs4_setup_session_slot_tables(session);
8095         dprintk("slot table setup returned %d\n", status);
8096         if (status)
8097                 goto out;
8098
8099         ptr = (unsigned *)&session->sess_id.data[0];
8100         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
8101                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
8102 out:
8103         dprintk("<-- %s\n", __func__);
8104         return status;
8105 }
8106
8107 /*
8108  * Issue the over-the-wire RPC DESTROY_SESSION.
8109  * The caller must serialize access to this routine.
8110  */
8111 int nfs4_proc_destroy_session(struct nfs4_session *session,
8112                 struct rpc_cred *cred)
8113 {
8114         struct rpc_message msg = {
8115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
8116                 .rpc_argp = session,
8117                 .rpc_cred = cred,
8118         };
8119         int status = 0;
8120
8121         dprintk("--> nfs4_proc_destroy_session\n");
8122
8123         /* session is still being setup */
8124         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
8125                 return 0;
8126
8127         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
8128         trace_nfs4_destroy_session(session->clp, status);
8129
8130         if (status)
8131                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
8132                         "Session has been destroyed regardless...\n", status);
8133
8134         dprintk("<-- nfs4_proc_destroy_session\n");
8135         return status;
8136 }
8137
8138 /*
8139  * Renew the cl_session lease.
8140  */
8141 struct nfs4_sequence_data {
8142         struct nfs_client *clp;
8143         struct nfs4_sequence_args args;
8144         struct nfs4_sequence_res res;
8145 };
8146
8147 static void nfs41_sequence_release(void *data)
8148 {
8149         struct nfs4_sequence_data *calldata = data;
8150         struct nfs_client *clp = calldata->clp;
8151
8152         if (atomic_read(&clp->cl_count) > 1)
8153                 nfs4_schedule_state_renewal(clp);
8154         nfs_put_client(clp);
8155         kfree(calldata);
8156 }
8157
8158 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8159 {
8160         switch(task->tk_status) {
8161         case -NFS4ERR_DELAY:
8162                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8163                 return -EAGAIN;
8164         default:
8165                 nfs4_schedule_lease_recovery(clp);
8166         }
8167         return 0;
8168 }
8169
8170 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
8171 {
8172         struct nfs4_sequence_data *calldata = data;
8173         struct nfs_client *clp = calldata->clp;
8174
8175         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
8176                 return;
8177
8178         trace_nfs4_sequence(clp, task->tk_status);
8179         if (task->tk_status < 0) {
8180                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
8181                 if (atomic_read(&clp->cl_count) == 1)
8182                         goto out;
8183
8184                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
8185                         rpc_restart_call_prepare(task);
8186                         return;
8187                 }
8188         }
8189         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
8190 out:
8191         dprintk("<-- %s\n", __func__);
8192 }
8193
8194 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
8195 {
8196         struct nfs4_sequence_data *calldata = data;
8197         struct nfs_client *clp = calldata->clp;
8198         struct nfs4_sequence_args *args;
8199         struct nfs4_sequence_res *res;
8200
8201         args = task->tk_msg.rpc_argp;
8202         res = task->tk_msg.rpc_resp;
8203
8204         nfs41_setup_sequence(clp->cl_session, args, res, task);
8205 }
8206
8207 static const struct rpc_call_ops nfs41_sequence_ops = {
8208         .rpc_call_done = nfs41_sequence_call_done,
8209         .rpc_call_prepare = nfs41_sequence_prepare,
8210         .rpc_release = nfs41_sequence_release,
8211 };
8212
8213 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
8214                 struct rpc_cred *cred,
8215                 bool is_privileged)
8216 {
8217         struct nfs4_sequence_data *calldata;
8218         struct rpc_message msg = {
8219                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
8220                 .rpc_cred = cred,
8221         };
8222         struct rpc_task_setup task_setup_data = {
8223                 .rpc_client = clp->cl_rpcclient,
8224                 .rpc_message = &msg,
8225                 .callback_ops = &nfs41_sequence_ops,
8226                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
8227         };
8228
8229         if (!atomic_inc_not_zero(&clp->cl_count))
8230                 return ERR_PTR(-EIO);
8231         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8232         if (calldata == NULL) {
8233                 nfs_put_client(clp);
8234                 return ERR_PTR(-ENOMEM);
8235         }
8236         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
8237         if (is_privileged)
8238                 nfs4_set_sequence_privileged(&calldata->args);
8239         msg.rpc_argp = &calldata->args;
8240         msg.rpc_resp = &calldata->res;
8241         calldata->clp = clp;
8242         task_setup_data.callback_data = calldata;
8243
8244         return rpc_run_task(&task_setup_data);
8245 }
8246
8247 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
8248 {
8249         struct rpc_task *task;
8250         int ret = 0;
8251
8252         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
8253                 return -EAGAIN;
8254         task = _nfs41_proc_sequence(clp, cred, false);
8255         if (IS_ERR(task))
8256                 ret = PTR_ERR(task);
8257         else
8258                 rpc_put_task_async(task);
8259         dprintk("<-- %s status=%d\n", __func__, ret);
8260         return ret;
8261 }
8262
8263 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
8264 {
8265         struct rpc_task *task;
8266         int ret;
8267
8268         task = _nfs41_proc_sequence(clp, cred, true);
8269         if (IS_ERR(task)) {
8270                 ret = PTR_ERR(task);
8271                 goto out;
8272         }
8273         ret = rpc_wait_for_completion_task(task);
8274         if (!ret)
8275                 ret = task->tk_status;
8276         rpc_put_task(task);
8277 out:
8278         dprintk("<-- %s status=%d\n", __func__, ret);
8279         return ret;
8280 }
8281
8282 struct nfs4_reclaim_complete_data {
8283         struct nfs_client *clp;
8284         struct nfs41_reclaim_complete_args arg;
8285         struct nfs41_reclaim_complete_res res;
8286 };
8287
8288 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
8289 {
8290         struct nfs4_reclaim_complete_data *calldata = data;
8291
8292         nfs41_setup_sequence(calldata->clp->cl_session,
8293                         &calldata->arg.seq_args,
8294                         &calldata->res.seq_res,
8295                         task);
8296 }
8297
8298 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8299 {
8300         switch(task->tk_status) {
8301         case 0:
8302         case -NFS4ERR_COMPLETE_ALREADY:
8303         case -NFS4ERR_WRONG_CRED: /* What to do here? */
8304                 break;
8305         case -NFS4ERR_DELAY:
8306                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8307                 /* fall through */
8308         case -NFS4ERR_RETRY_UNCACHED_REP:
8309                 return -EAGAIN;
8310         default:
8311                 nfs4_schedule_lease_recovery(clp);
8312         }
8313         return 0;
8314 }
8315
8316 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
8317 {
8318         struct nfs4_reclaim_complete_data *calldata = data;
8319         struct nfs_client *clp = calldata->clp;
8320         struct nfs4_sequence_res *res = &calldata->res.seq_res;
8321
8322         dprintk("--> %s\n", __func__);
8323         if (!nfs41_sequence_done(task, res))
8324                 return;
8325
8326         trace_nfs4_reclaim_complete(clp, task->tk_status);
8327         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
8328                 rpc_restart_call_prepare(task);
8329                 return;
8330         }
8331         dprintk("<-- %s\n", __func__);
8332 }
8333
8334 static void nfs4_free_reclaim_complete_data(void *data)
8335 {
8336         struct nfs4_reclaim_complete_data *calldata = data;
8337
8338         kfree(calldata);
8339 }
8340
8341 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
8342         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
8343         .rpc_call_done = nfs4_reclaim_complete_done,
8344         .rpc_release = nfs4_free_reclaim_complete_data,
8345 };
8346
8347 /*
8348  * Issue a global reclaim complete.
8349  */
8350 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
8351                 struct rpc_cred *cred)
8352 {
8353         struct nfs4_reclaim_complete_data *calldata;
8354         struct rpc_task *task;
8355         struct rpc_message msg = {
8356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
8357                 .rpc_cred = cred,
8358         };
8359         struct rpc_task_setup task_setup_data = {
8360                 .rpc_client = clp->cl_rpcclient,
8361                 .rpc_message = &msg,
8362                 .callback_ops = &nfs4_reclaim_complete_call_ops,
8363                 .flags = RPC_TASK_ASYNC,
8364         };
8365         int status = -ENOMEM;
8366
8367         dprintk("--> %s\n", __func__);
8368         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8369         if (calldata == NULL)
8370                 goto out;
8371         calldata->clp = clp;
8372         calldata->arg.one_fs = 0;
8373
8374         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
8375         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
8376         msg.rpc_argp = &calldata->arg;
8377         msg.rpc_resp = &calldata->res;
8378         task_setup_data.callback_data = calldata;
8379         task = rpc_run_task(&task_setup_data);
8380         if (IS_ERR(task)) {
8381                 status = PTR_ERR(task);
8382                 goto out;
8383         }
8384         status = nfs4_wait_for_completion_rpc_task(task);
8385         if (status == 0)
8386                 status = task->tk_status;
8387         rpc_put_task(task);
8388         return 0;
8389 out:
8390         dprintk("<-- %s status=%d\n", __func__, status);
8391         return status;
8392 }
8393
8394 static void
8395 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
8396 {
8397         struct nfs4_layoutget *lgp = calldata;
8398         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
8399         struct nfs4_session *session = nfs4_get_session(server->nfs_client);
8400
8401         dprintk("--> %s\n", __func__);
8402         nfs41_setup_sequence(session, &lgp->args.seq_args,
8403                                 &lgp->res.seq_res, task);
8404         dprintk("<-- %s\n", __func__);
8405 }
8406
8407 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
8408 {
8409         struct nfs4_layoutget *lgp = calldata;
8410
8411         dprintk("--> %s\n", __func__);
8412         nfs41_sequence_process(task, &lgp->res.seq_res);
8413         dprintk("<-- %s\n", __func__);
8414 }
8415
8416 static int
8417 nfs4_layoutget_handle_exception(struct rpc_task *task,
8418                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
8419 {
8420         struct inode *inode = lgp->args.inode;
8421         struct nfs_server *server = NFS_SERVER(inode);
8422         struct pnfs_layout_hdr *lo;
8423         int nfs4err = task->tk_status;
8424         int err, status = 0;
8425         LIST_HEAD(head);
8426
8427         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
8428
8429         switch (nfs4err) {
8430         case 0:
8431                 goto out;
8432
8433         /*
8434          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
8435          * on the file. set tk_status to -ENODATA to tell upper layer to
8436          * retry go inband.
8437          */
8438         case -NFS4ERR_LAYOUTUNAVAILABLE:
8439                 status = -ENODATA;
8440                 goto out;
8441         /*
8442          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
8443          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
8444          */
8445         case -NFS4ERR_BADLAYOUT:
8446                 status = -EOVERFLOW;
8447                 goto out;
8448         /*
8449          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
8450          * (or clients) writing to the same RAID stripe except when
8451          * the minlength argument is 0 (see RFC5661 section 18.43.3).
8452          *
8453          * Treat it like we would RECALLCONFLICT -- we retry for a little
8454          * while, and then eventually give up.
8455          */
8456         case -NFS4ERR_LAYOUTTRYLATER:
8457                 if (lgp->args.minlength == 0) {
8458                         status = -EOVERFLOW;
8459                         goto out;
8460                 }
8461                 status = -EBUSY;
8462                 break;
8463         case -NFS4ERR_RECALLCONFLICT:
8464                 status = -ERECALLCONFLICT;
8465                 break;
8466         case -NFS4ERR_DELEG_REVOKED:
8467         case -NFS4ERR_ADMIN_REVOKED:
8468         case -NFS4ERR_EXPIRED:
8469         case -NFS4ERR_BAD_STATEID:
8470                 exception->timeout = 0;
8471                 spin_lock(&inode->i_lock);
8472                 lo = NFS_I(inode)->layout;
8473                 /* If the open stateid was bad, then recover it. */
8474                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
8475                     nfs4_stateid_match_other(&lgp->args.stateid,
8476                                         &lgp->args.ctx->state->stateid)) {
8477                         spin_unlock(&inode->i_lock);
8478                         exception->state = lgp->args.ctx->state;
8479                         exception->stateid = &lgp->args.stateid;
8480                         break;
8481                 }
8482
8483                 /*
8484                  * Mark the bad layout state as invalid, then retry
8485                  */
8486                 pnfs_mark_layout_stateid_invalid(lo, &head);
8487                 spin_unlock(&inode->i_lock);
8488                 pnfs_free_lseg_list(&head);
8489                 status = -EAGAIN;
8490                 goto out;
8491         }
8492
8493         nfs4_sequence_free_slot(&lgp->res.seq_res);
8494         err = nfs4_handle_exception(server, nfs4err, exception);
8495         if (!status) {
8496                 if (exception->retry)
8497                         status = -EAGAIN;
8498                 else
8499                         status = err;
8500         }
8501 out:
8502         dprintk("<-- %s\n", __func__);
8503         return status;
8504 }
8505
8506 static size_t max_response_pages(struct nfs_server *server)
8507 {
8508         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
8509         return nfs_page_array_len(0, max_resp_sz);
8510 }
8511
8512 static void nfs4_free_pages(struct page **pages, size_t size)
8513 {
8514         int i;
8515
8516         if (!pages)
8517                 return;
8518
8519         for (i = 0; i < size; i++) {
8520                 if (!pages[i])
8521                         break;
8522                 __free_page(pages[i]);
8523         }
8524         kfree(pages);
8525 }
8526
8527 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
8528 {
8529         struct page **pages;
8530         int i;
8531
8532         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
8533         if (!pages) {
8534                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
8535                 return NULL;
8536         }
8537
8538         for (i = 0; i < size; i++) {
8539                 pages[i] = alloc_page(gfp_flags);
8540                 if (!pages[i]) {
8541                         dprintk("%s: failed to allocate page\n", __func__);
8542                         nfs4_free_pages(pages, size);
8543                         return NULL;
8544                 }
8545         }
8546
8547         return pages;
8548 }
8549
8550 static void nfs4_layoutget_release(void *calldata)
8551 {
8552         struct nfs4_layoutget *lgp = calldata;
8553         struct inode *inode = lgp->args.inode;
8554         struct nfs_server *server = NFS_SERVER(inode);
8555         size_t max_pages = max_response_pages(server);
8556
8557         dprintk("--> %s\n", __func__);
8558         nfs4_free_pages(lgp->args.layout.pages, max_pages);
8559         pnfs_put_layout_hdr(NFS_I(inode)->layout);
8560         put_nfs_open_context(lgp->args.ctx);
8561         kfree(calldata);
8562         dprintk("<-- %s\n", __func__);
8563 }
8564
8565 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
8566         .rpc_call_prepare = nfs4_layoutget_prepare,
8567         .rpc_call_done = nfs4_layoutget_done,
8568         .rpc_release = nfs4_layoutget_release,
8569 };
8570
8571 struct pnfs_layout_segment *
8572 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags)
8573 {
8574         struct inode *inode = lgp->args.inode;
8575         struct nfs_server *server = NFS_SERVER(inode);
8576         size_t max_pages = max_response_pages(server);
8577         struct rpc_task *task;
8578         struct rpc_message msg = {
8579                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
8580                 .rpc_argp = &lgp->args,
8581                 .rpc_resp = &lgp->res,
8582                 .rpc_cred = lgp->cred,
8583         };
8584         struct rpc_task_setup task_setup_data = {
8585                 .rpc_client = server->client,
8586                 .rpc_message = &msg,
8587                 .callback_ops = &nfs4_layoutget_call_ops,
8588                 .callback_data = lgp,
8589                 .flags = RPC_TASK_ASYNC,
8590         };
8591         struct pnfs_layout_segment *lseg = NULL;
8592         struct nfs4_exception exception = {
8593                 .inode = inode,
8594                 .timeout = *timeout,
8595         };
8596         int status = 0;
8597
8598         dprintk("--> %s\n", __func__);
8599
8600         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
8601         pnfs_get_layout_hdr(NFS_I(inode)->layout);
8602
8603         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
8604         if (!lgp->args.layout.pages) {
8605                 nfs4_layoutget_release(lgp);
8606                 return ERR_PTR(-ENOMEM);
8607         }
8608         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
8609
8610         lgp->res.layoutp = &lgp->args.layout;
8611         lgp->res.seq_res.sr_slot = NULL;
8612         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
8613
8614         task = rpc_run_task(&task_setup_data);
8615         if (IS_ERR(task))
8616                 return ERR_CAST(task);
8617         status = nfs4_wait_for_completion_rpc_task(task);
8618         if (status == 0) {
8619                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
8620                 *timeout = exception.timeout;
8621         }
8622
8623         trace_nfs4_layoutget(lgp->args.ctx,
8624                         &lgp->args.range,
8625                         &lgp->res.range,
8626                         &lgp->res.stateid,
8627                         status);
8628
8629         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8630         if (status == 0 && lgp->res.layoutp->len)
8631                 lseg = pnfs_layout_process(lgp);
8632         nfs4_sequence_free_slot(&lgp->res.seq_res);
8633         rpc_put_task(task);
8634         dprintk("<-- %s status=%d\n", __func__, status);
8635         if (status)
8636                 return ERR_PTR(status);
8637         return lseg;
8638 }
8639
8640 static void
8641 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8642 {
8643         struct nfs4_layoutreturn *lrp = calldata;
8644
8645         dprintk("--> %s\n", __func__);
8646         nfs41_setup_sequence(lrp->clp->cl_session,
8647                         &lrp->args.seq_args,
8648                         &lrp->res.seq_res,
8649                         task);
8650 }
8651
8652 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8653 {
8654         struct nfs4_layoutreturn *lrp = calldata;
8655         struct nfs_server *server;
8656
8657         dprintk("--> %s\n", __func__);
8658
8659         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
8660                 return;
8661
8662         server = NFS_SERVER(lrp->args.inode);
8663         switch (task->tk_status) {
8664         default:
8665                 task->tk_status = 0;
8666         case 0:
8667                 break;
8668         case -NFS4ERR_DELAY:
8669                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8670                         break;
8671                 nfs4_sequence_free_slot(&lrp->res.seq_res);
8672                 rpc_restart_call_prepare(task);
8673                 return;
8674         }
8675         dprintk("<-- %s\n", __func__);
8676 }
8677
8678 static void nfs4_layoutreturn_release(void *calldata)
8679 {
8680         struct nfs4_layoutreturn *lrp = calldata;
8681         struct pnfs_layout_hdr *lo = lrp->args.layout;
8682
8683         dprintk("--> %s\n", __func__);
8684         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
8685                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
8686         nfs4_sequence_free_slot(&lrp->res.seq_res);
8687         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
8688                 lrp->ld_private.ops->free(&lrp->ld_private);
8689         pnfs_put_layout_hdr(lrp->args.layout);
8690         nfs_iput_and_deactive(lrp->inode);
8691         kfree(calldata);
8692         dprintk("<-- %s\n", __func__);
8693 }
8694
8695 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8696         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8697         .rpc_call_done = nfs4_layoutreturn_done,
8698         .rpc_release = nfs4_layoutreturn_release,
8699 };
8700
8701 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8702 {
8703         struct rpc_task *task;
8704         struct rpc_message msg = {
8705                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8706                 .rpc_argp = &lrp->args,
8707                 .rpc_resp = &lrp->res,
8708                 .rpc_cred = lrp->cred,
8709         };
8710         struct rpc_task_setup task_setup_data = {
8711                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8712                 .rpc_message = &msg,
8713                 .callback_ops = &nfs4_layoutreturn_call_ops,
8714                 .callback_data = lrp,
8715         };
8716         int status = 0;
8717
8718         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8719                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8720                         &task_setup_data.rpc_client, &msg);
8721
8722         dprintk("--> %s\n", __func__);
8723         if (!sync) {
8724                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8725                 if (!lrp->inode) {
8726                         nfs4_layoutreturn_release(lrp);
8727                         return -EAGAIN;
8728                 }
8729                 task_setup_data.flags |= RPC_TASK_ASYNC;
8730         }
8731         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8732         task = rpc_run_task(&task_setup_data);
8733         if (IS_ERR(task))
8734                 return PTR_ERR(task);
8735         if (sync)
8736                 status = task->tk_status;
8737         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8738         dprintk("<-- %s status=%d\n", __func__, status);
8739         rpc_put_task(task);
8740         return status;
8741 }
8742
8743 static int
8744 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8745                 struct pnfs_device *pdev,
8746                 struct rpc_cred *cred)
8747 {
8748         struct nfs4_getdeviceinfo_args args = {
8749                 .pdev = pdev,
8750                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8751                         NOTIFY_DEVICEID4_DELETE,
8752         };
8753         struct nfs4_getdeviceinfo_res res = {
8754                 .pdev = pdev,
8755         };
8756         struct rpc_message msg = {
8757                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8758                 .rpc_argp = &args,
8759                 .rpc_resp = &res,
8760                 .rpc_cred = cred,
8761         };
8762         int status;
8763
8764         dprintk("--> %s\n", __func__);
8765         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8766         if (res.notification & ~args.notify_types)
8767                 dprintk("%s: unsupported notification\n", __func__);
8768         if (res.notification != args.notify_types)
8769                 pdev->nocache = 1;
8770
8771         dprintk("<-- %s status=%d\n", __func__, status);
8772
8773         return status;
8774 }
8775
8776 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8777                 struct pnfs_device *pdev,
8778                 struct rpc_cred *cred)
8779 {
8780         struct nfs4_exception exception = { };
8781         int err;
8782
8783         do {
8784                 err = nfs4_handle_exception(server,
8785                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8786                                         &exception);
8787         } while (exception.retry);
8788         return err;
8789 }
8790 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8791
8792 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8793 {
8794         struct nfs4_layoutcommit_data *data = calldata;
8795         struct nfs_server *server = NFS_SERVER(data->args.inode);
8796         struct nfs4_session *session = nfs4_get_session(server->nfs_client);
8797
8798         nfs41_setup_sequence(session,
8799                         &data->args.seq_args,
8800                         &data->res.seq_res,
8801                         task);
8802 }
8803
8804 static void
8805 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8806 {
8807         struct nfs4_layoutcommit_data *data = calldata;
8808         struct nfs_server *server = NFS_SERVER(data->args.inode);
8809
8810         if (!nfs41_sequence_done(task, &data->res.seq_res))
8811                 return;
8812
8813         switch (task->tk_status) { /* Just ignore these failures */
8814         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8815         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8816         case -NFS4ERR_BADLAYOUT:     /* no layout */
8817         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8818                 task->tk_status = 0;
8819         case 0:
8820                 break;
8821         default:
8822                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8823                         rpc_restart_call_prepare(task);
8824                         return;
8825                 }
8826         }
8827 }
8828
8829 static void nfs4_layoutcommit_release(void *calldata)
8830 {
8831         struct nfs4_layoutcommit_data *data = calldata;
8832
8833         pnfs_cleanup_layoutcommit(data);
8834         nfs_post_op_update_inode_force_wcc(data->args.inode,
8835                                            data->res.fattr);
8836         put_rpccred(data->cred);
8837         nfs_iput_and_deactive(data->inode);
8838         kfree(data);
8839 }
8840
8841 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8842         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8843         .rpc_call_done = nfs4_layoutcommit_done,
8844         .rpc_release = nfs4_layoutcommit_release,
8845 };
8846
8847 int
8848 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8849 {
8850         struct rpc_message msg = {
8851                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8852                 .rpc_argp = &data->args,
8853                 .rpc_resp = &data->res,
8854                 .rpc_cred = data->cred,
8855         };
8856         struct rpc_task_setup task_setup_data = {
8857                 .task = &data->task,
8858                 .rpc_client = NFS_CLIENT(data->args.inode),
8859                 .rpc_message = &msg,
8860                 .callback_ops = &nfs4_layoutcommit_ops,
8861                 .callback_data = data,
8862         };
8863         struct rpc_task *task;
8864         int status = 0;
8865
8866         dprintk("NFS: initiating layoutcommit call. sync %d "
8867                 "lbw: %llu inode %lu\n", sync,
8868                 data->args.lastbytewritten,
8869                 data->args.inode->i_ino);
8870
8871         if (!sync) {
8872                 data->inode = nfs_igrab_and_active(data->args.inode);
8873                 if (data->inode == NULL) {
8874                         nfs4_layoutcommit_release(data);
8875                         return -EAGAIN;
8876                 }
8877                 task_setup_data.flags = RPC_TASK_ASYNC;
8878         }
8879         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8880         task = rpc_run_task(&task_setup_data);
8881         if (IS_ERR(task))
8882                 return PTR_ERR(task);
8883         if (sync)
8884                 status = task->tk_status;
8885         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
8886         dprintk("%s: status %d\n", __func__, status);
8887         rpc_put_task(task);
8888         return status;
8889 }
8890
8891 /**
8892  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8893  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8894  */
8895 static int
8896 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8897                     struct nfs_fsinfo *info,
8898                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8899 {
8900         struct nfs41_secinfo_no_name_args args = {
8901                 .style = SECINFO_STYLE_CURRENT_FH,
8902         };
8903         struct nfs4_secinfo_res res = {
8904                 .flavors = flavors,
8905         };
8906         struct rpc_message msg = {
8907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8908                 .rpc_argp = &args,
8909                 .rpc_resp = &res,
8910         };
8911         struct rpc_clnt *clnt = server->client;
8912         struct rpc_cred *cred = NULL;
8913         int status;
8914
8915         if (use_integrity) {
8916                 clnt = server->nfs_client->cl_rpcclient;
8917                 cred = nfs4_get_clid_cred(server->nfs_client);
8918                 msg.rpc_cred = cred;
8919         }
8920
8921         dprintk("--> %s\n", __func__);
8922         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8923                                 &res.seq_res, 0);
8924         dprintk("<-- %s status=%d\n", __func__, status);
8925
8926         if (cred)
8927                 put_rpccred(cred);
8928
8929         return status;
8930 }
8931
8932 static int
8933 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8934                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8935 {
8936         struct nfs4_exception exception = { };
8937         int err;
8938         do {
8939                 /* first try using integrity protection */
8940                 err = -NFS4ERR_WRONGSEC;
8941
8942                 /* try to use integrity protection with machine cred */
8943                 if (_nfs4_is_integrity_protected(server->nfs_client))
8944                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8945                                                           flavors, true);
8946
8947                 /*
8948                  * if unable to use integrity protection, or SECINFO with
8949                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8950                  * disallowed by spec, but exists in deployed servers) use
8951                  * the current filesystem's rpc_client and the user cred.
8952                  */
8953                 if (err == -NFS4ERR_WRONGSEC)
8954                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8955                                                           flavors, false);
8956
8957                 switch (err) {
8958                 case 0:
8959                 case -NFS4ERR_WRONGSEC:
8960                 case -ENOTSUPP:
8961                         goto out;
8962                 default:
8963                         err = nfs4_handle_exception(server, err, &exception);
8964                 }
8965         } while (exception.retry);
8966 out:
8967         return err;
8968 }
8969
8970 static int
8971 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8972                     struct nfs_fsinfo *info)
8973 {
8974         int err;
8975         struct page *page;
8976         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8977         struct nfs4_secinfo_flavors *flavors;
8978         struct nfs4_secinfo4 *secinfo;
8979         int i;
8980
8981         page = alloc_page(GFP_KERNEL);
8982         if (!page) {
8983                 err = -ENOMEM;
8984                 goto out;
8985         }
8986
8987         flavors = page_address(page);
8988         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8989
8990         /*
8991          * Fall back on "guess and check" method if
8992          * the server doesn't support SECINFO_NO_NAME
8993          */
8994         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8995                 err = nfs4_find_root_sec(server, fhandle, info);
8996                 goto out_freepage;
8997         }
8998         if (err)
8999                 goto out_freepage;
9000
9001         for (i = 0; i < flavors->num_flavors; i++) {
9002                 secinfo = &flavors->flavors[i];
9003
9004                 switch (secinfo->flavor) {
9005                 case RPC_AUTH_NULL:
9006                 case RPC_AUTH_UNIX:
9007                 case RPC_AUTH_GSS:
9008                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9009                                         &secinfo->flavor_info);
9010                         break;
9011                 default:
9012                         flavor = RPC_AUTH_MAXFLAVOR;
9013                         break;
9014                 }
9015
9016                 if (!nfs_auth_info_match(&server->auth_info, flavor))
9017                         flavor = RPC_AUTH_MAXFLAVOR;
9018
9019                 if (flavor != RPC_AUTH_MAXFLAVOR) {
9020                         err = nfs4_lookup_root_sec(server, fhandle,
9021                                                    info, flavor);
9022                         if (!err)
9023                                 break;
9024                 }
9025         }
9026
9027         if (flavor == RPC_AUTH_MAXFLAVOR)
9028                 err = -EPERM;
9029
9030 out_freepage:
9031         put_page(page);
9032         if (err == -EACCES)
9033                 return -EPERM;
9034 out:
9035         return err;
9036 }
9037
9038 static int _nfs41_test_stateid(struct nfs_server *server,
9039                 nfs4_stateid *stateid,
9040                 struct rpc_cred *cred)
9041 {
9042         int status;
9043         struct nfs41_test_stateid_args args = {
9044                 .stateid = stateid,
9045         };
9046         struct nfs41_test_stateid_res res;
9047         struct rpc_message msg = {
9048                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9049                 .rpc_argp = &args,
9050                 .rpc_resp = &res,
9051                 .rpc_cred = cred,
9052         };
9053         struct rpc_clnt *rpc_client = server->client;
9054
9055         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9056                 &rpc_client, &msg);
9057
9058         dprintk("NFS call  test_stateid %p\n", stateid);
9059         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
9060         nfs4_set_sequence_privileged(&args.seq_args);
9061         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9062                         &args.seq_args, &res.seq_res);
9063         if (status != NFS_OK) {
9064                 dprintk("NFS reply test_stateid: failed, %d\n", status);
9065                 return status;
9066         }
9067         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
9068         return -res.status;
9069 }
9070
9071 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
9072                 int err, struct nfs4_exception *exception)
9073 {
9074         exception->retry = 0;
9075         switch(err) {
9076         case -NFS4ERR_DELAY:
9077         case -NFS4ERR_RETRY_UNCACHED_REP:
9078                 nfs4_handle_exception(server, err, exception);
9079                 break;
9080         case -NFS4ERR_BADSESSION:
9081         case -NFS4ERR_BADSLOT:
9082         case -NFS4ERR_BAD_HIGH_SLOT:
9083         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9084         case -NFS4ERR_DEADSESSION:
9085                 nfs4_do_handle_exception(server, err, exception);
9086         }
9087 }
9088
9089 /**
9090  * nfs41_test_stateid - perform a TEST_STATEID operation
9091  *
9092  * @server: server / transport on which to perform the operation
9093  * @stateid: state ID to test
9094  * @cred: credential
9095  *
9096  * Returns NFS_OK if the server recognizes that "stateid" is valid.
9097  * Otherwise a negative NFS4ERR value is returned if the operation
9098  * failed or the state ID is not currently valid.
9099  */
9100 static int nfs41_test_stateid(struct nfs_server *server,
9101                 nfs4_stateid *stateid,
9102                 struct rpc_cred *cred)
9103 {
9104         struct nfs4_exception exception = { };
9105         int err;
9106         do {
9107                 err = _nfs41_test_stateid(server, stateid, cred);
9108                 nfs4_handle_delay_or_session_error(server, err, &exception);
9109         } while (exception.retry);
9110         return err;
9111 }
9112
9113 struct nfs_free_stateid_data {
9114         struct nfs_server *server;
9115         struct nfs41_free_stateid_args args;
9116         struct nfs41_free_stateid_res res;
9117 };
9118
9119 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
9120 {
9121         struct nfs_free_stateid_data *data = calldata;
9122         nfs41_setup_sequence(nfs4_get_session(data->server->nfs_client),
9123                         &data->args.seq_args,
9124                         &data->res.seq_res,
9125                         task);
9126 }
9127
9128 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
9129 {
9130         struct nfs_free_stateid_data *data = calldata;
9131
9132         nfs41_sequence_done(task, &data->res.seq_res);
9133
9134         switch (task->tk_status) {
9135         case -NFS4ERR_DELAY:
9136                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
9137                         rpc_restart_call_prepare(task);
9138         }
9139 }
9140
9141 static void nfs41_free_stateid_release(void *calldata)
9142 {
9143         kfree(calldata);
9144 }
9145
9146 static const struct rpc_call_ops nfs41_free_stateid_ops = {
9147         .rpc_call_prepare = nfs41_free_stateid_prepare,
9148         .rpc_call_done = nfs41_free_stateid_done,
9149         .rpc_release = nfs41_free_stateid_release,
9150 };
9151
9152 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
9153                 const nfs4_stateid *stateid,
9154                 struct rpc_cred *cred,
9155                 bool privileged)
9156 {
9157         struct rpc_message msg = {
9158                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
9159                 .rpc_cred = cred,
9160         };
9161         struct rpc_task_setup task_setup = {
9162                 .rpc_client = server->client,
9163                 .rpc_message = &msg,
9164                 .callback_ops = &nfs41_free_stateid_ops,
9165                 .flags = RPC_TASK_ASYNC,
9166         };
9167         struct nfs_free_stateid_data *data;
9168
9169         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9170                 &task_setup.rpc_client, &msg);
9171
9172         dprintk("NFS call  free_stateid %p\n", stateid);
9173         data = kmalloc(sizeof(*data), GFP_NOFS);
9174         if (!data)
9175                 return ERR_PTR(-ENOMEM);
9176         data->server = server;
9177         nfs4_stateid_copy(&data->args.stateid, stateid);
9178
9179         task_setup.callback_data = data;
9180
9181         msg.rpc_argp = &data->args;
9182         msg.rpc_resp = &data->res;
9183         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
9184         if (privileged)
9185                 nfs4_set_sequence_privileged(&data->args.seq_args);
9186
9187         return rpc_run_task(&task_setup);
9188 }
9189
9190 /**
9191  * nfs41_free_stateid - perform a FREE_STATEID operation
9192  *
9193  * @server: server / transport on which to perform the operation
9194  * @stateid: state ID to release
9195  * @cred: credential
9196  * @is_recovery: set to true if this call needs to be privileged
9197  *
9198  * Note: this function is always asynchronous.
9199  */
9200 static int nfs41_free_stateid(struct nfs_server *server,
9201                 const nfs4_stateid *stateid,
9202                 struct rpc_cred *cred,
9203                 bool is_recovery)
9204 {
9205         struct rpc_task *task;
9206
9207         task = _nfs41_free_stateid(server, stateid, cred, is_recovery);
9208         if (IS_ERR(task))
9209                 return PTR_ERR(task);
9210         rpc_put_task(task);
9211         return 0;
9212 }
9213
9214 static void
9215 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
9216 {
9217         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
9218
9219         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
9220         nfs4_free_lock_state(server, lsp);
9221 }
9222
9223 static bool nfs41_match_stateid(const nfs4_stateid *s1,
9224                 const nfs4_stateid *s2)
9225 {
9226         if (s1->type != s2->type)
9227                 return false;
9228
9229         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
9230                 return false;
9231
9232         if (s1->seqid == s2->seqid)
9233                 return true;
9234         if (s1->seqid == 0 || s2->seqid == 0)
9235                 return true;
9236
9237         return false;
9238 }
9239
9240 #endif /* CONFIG_NFS_V4_1 */
9241
9242 static bool nfs4_match_stateid(const nfs4_stateid *s1,
9243                 const nfs4_stateid *s2)
9244 {
9245         return nfs4_stateid_match(s1, s2);
9246 }
9247
9248
9249 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
9250         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9251         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9252         .recover_open   = nfs4_open_reclaim,
9253         .recover_lock   = nfs4_lock_reclaim,
9254         .establish_clid = nfs4_init_clientid,
9255         .detect_trunking = nfs40_discover_server_trunking,
9256 };
9257
9258 #if defined(CONFIG_NFS_V4_1)
9259 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
9260         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9261         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9262         .recover_open   = nfs4_open_reclaim,
9263         .recover_lock   = nfs4_lock_reclaim,
9264         .establish_clid = nfs41_init_clientid,
9265         .reclaim_complete = nfs41_proc_reclaim_complete,
9266         .detect_trunking = nfs41_discover_server_trunking,
9267 };
9268 #endif /* CONFIG_NFS_V4_1 */
9269
9270 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
9271         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9272         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9273         .recover_open   = nfs40_open_expired,
9274         .recover_lock   = nfs4_lock_expired,
9275         .establish_clid = nfs4_init_clientid,
9276 };
9277
9278 #if defined(CONFIG_NFS_V4_1)
9279 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
9280         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9281         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9282         .recover_open   = nfs41_open_expired,
9283         .recover_lock   = nfs41_lock_expired,
9284         .establish_clid = nfs41_init_clientid,
9285 };
9286 #endif /* CONFIG_NFS_V4_1 */
9287
9288 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
9289         .sched_state_renewal = nfs4_proc_async_renew,
9290         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
9291         .renew_lease = nfs4_proc_renew,
9292 };
9293
9294 #if defined(CONFIG_NFS_V4_1)
9295 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
9296         .sched_state_renewal = nfs41_proc_async_sequence,
9297         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
9298         .renew_lease = nfs4_proc_sequence,
9299 };
9300 #endif
9301
9302 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
9303         .get_locations = _nfs40_proc_get_locations,
9304         .fsid_present = _nfs40_proc_fsid_present,
9305 };
9306
9307 #if defined(CONFIG_NFS_V4_1)
9308 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
9309         .get_locations = _nfs41_proc_get_locations,
9310         .fsid_present = _nfs41_proc_fsid_present,
9311 };
9312 #endif  /* CONFIG_NFS_V4_1 */
9313
9314 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
9315         .minor_version = 0,
9316         .init_caps = NFS_CAP_READDIRPLUS
9317                 | NFS_CAP_ATOMIC_OPEN
9318                 | NFS_CAP_POSIX_LOCK,
9319         .init_client = nfs40_init_client,
9320         .shutdown_client = nfs40_shutdown_client,
9321         .match_stateid = nfs4_match_stateid,
9322         .find_root_sec = nfs4_find_root_sec,
9323         .free_lock_state = nfs4_release_lockowner,
9324         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
9325         .alloc_seqid = nfs_alloc_seqid,
9326         .call_sync_ops = &nfs40_call_sync_ops,
9327         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
9328         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
9329         .state_renewal_ops = &nfs40_state_renewal_ops,
9330         .mig_recovery_ops = &nfs40_mig_recovery_ops,
9331 };
9332
9333 #if defined(CONFIG_NFS_V4_1)
9334 static struct nfs_seqid *
9335 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
9336 {
9337         return NULL;
9338 }
9339
9340 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
9341         .minor_version = 1,
9342         .init_caps = NFS_CAP_READDIRPLUS
9343                 | NFS_CAP_ATOMIC_OPEN
9344                 | NFS_CAP_POSIX_LOCK
9345                 | NFS_CAP_STATEID_NFSV41
9346                 | NFS_CAP_ATOMIC_OPEN_V1,
9347         .init_client = nfs41_init_client,
9348         .shutdown_client = nfs41_shutdown_client,
9349         .match_stateid = nfs41_match_stateid,
9350         .find_root_sec = nfs41_find_root_sec,
9351         .free_lock_state = nfs41_free_lock_state,
9352         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9353         .alloc_seqid = nfs_alloc_no_seqid,
9354         .session_trunk = nfs4_test_session_trunk,
9355         .call_sync_ops = &nfs41_call_sync_ops,
9356         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9357         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9358         .state_renewal_ops = &nfs41_state_renewal_ops,
9359         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9360 };
9361 #endif
9362
9363 #if defined(CONFIG_NFS_V4_2)
9364 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
9365         .minor_version = 2,
9366         .init_caps = NFS_CAP_READDIRPLUS
9367                 | NFS_CAP_ATOMIC_OPEN
9368                 | NFS_CAP_POSIX_LOCK
9369                 | NFS_CAP_STATEID_NFSV41
9370                 | NFS_CAP_ATOMIC_OPEN_V1
9371                 | NFS_CAP_ALLOCATE
9372                 | NFS_CAP_COPY
9373                 | NFS_CAP_DEALLOCATE
9374                 | NFS_CAP_SEEK
9375                 | NFS_CAP_LAYOUTSTATS
9376                 | NFS_CAP_CLONE,
9377         .init_client = nfs41_init_client,
9378         .shutdown_client = nfs41_shutdown_client,
9379         .match_stateid = nfs41_match_stateid,
9380         .find_root_sec = nfs41_find_root_sec,
9381         .free_lock_state = nfs41_free_lock_state,
9382         .call_sync_ops = &nfs41_call_sync_ops,
9383         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9384         .alloc_seqid = nfs_alloc_no_seqid,
9385         .session_trunk = nfs4_test_session_trunk,
9386         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9387         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9388         .state_renewal_ops = &nfs41_state_renewal_ops,
9389         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9390 };
9391 #endif
9392
9393 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
9394         [0] = &nfs_v4_0_minor_ops,
9395 #if defined(CONFIG_NFS_V4_1)
9396         [1] = &nfs_v4_1_minor_ops,
9397 #endif
9398 #if defined(CONFIG_NFS_V4_2)
9399         [2] = &nfs_v4_2_minor_ops,
9400 #endif
9401 };
9402
9403 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
9404 {
9405         ssize_t error, error2;
9406
9407         error = generic_listxattr(dentry, list, size);
9408         if (error < 0)
9409                 return error;
9410         if (list) {
9411                 list += error;
9412                 size -= error;
9413         }
9414
9415         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
9416         if (error2 < 0)
9417                 return error2;
9418         return error + error2;
9419 }
9420
9421 static const struct inode_operations nfs4_dir_inode_operations = {
9422         .create         = nfs_create,
9423         .lookup         = nfs_lookup,
9424         .atomic_open    = nfs_atomic_open,
9425         .link           = nfs_link,
9426         .unlink         = nfs_unlink,
9427         .symlink        = nfs_symlink,
9428         .mkdir          = nfs_mkdir,
9429         .rmdir          = nfs_rmdir,
9430         .mknod          = nfs_mknod,
9431         .rename         = nfs_rename,
9432         .permission     = nfs_permission,
9433         .getattr        = nfs_getattr,
9434         .setattr        = nfs_setattr,
9435         .listxattr      = nfs4_listxattr,
9436 };
9437
9438 static const struct inode_operations nfs4_file_inode_operations = {
9439         .permission     = nfs_permission,
9440         .getattr        = nfs_getattr,
9441         .setattr        = nfs_setattr,
9442         .listxattr      = nfs4_listxattr,
9443 };
9444
9445 const struct nfs_rpc_ops nfs_v4_clientops = {
9446         .version        = 4,                    /* protocol version */
9447         .dentry_ops     = &nfs4_dentry_operations,
9448         .dir_inode_ops  = &nfs4_dir_inode_operations,
9449         .file_inode_ops = &nfs4_file_inode_operations,
9450         .file_ops       = &nfs4_file_operations,
9451         .getroot        = nfs4_proc_get_root,
9452         .submount       = nfs4_submount,
9453         .try_mount      = nfs4_try_mount,
9454         .getattr        = nfs4_proc_getattr,
9455         .setattr        = nfs4_proc_setattr,
9456         .lookup         = nfs4_proc_lookup,
9457         .access         = nfs4_proc_access,
9458         .readlink       = nfs4_proc_readlink,
9459         .create         = nfs4_proc_create,
9460         .remove         = nfs4_proc_remove,
9461         .unlink_setup   = nfs4_proc_unlink_setup,
9462         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
9463         .unlink_done    = nfs4_proc_unlink_done,
9464         .rename_setup   = nfs4_proc_rename_setup,
9465         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
9466         .rename_done    = nfs4_proc_rename_done,
9467         .link           = nfs4_proc_link,
9468         .symlink        = nfs4_proc_symlink,
9469         .mkdir          = nfs4_proc_mkdir,
9470         .rmdir          = nfs4_proc_remove,
9471         .readdir        = nfs4_proc_readdir,
9472         .mknod          = nfs4_proc_mknod,
9473         .statfs         = nfs4_proc_statfs,
9474         .fsinfo         = nfs4_proc_fsinfo,
9475         .pathconf       = nfs4_proc_pathconf,
9476         .set_capabilities = nfs4_server_capabilities,
9477         .decode_dirent  = nfs4_decode_dirent,
9478         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
9479         .read_setup     = nfs4_proc_read_setup,
9480         .read_done      = nfs4_read_done,
9481         .write_setup    = nfs4_proc_write_setup,
9482         .write_done     = nfs4_write_done,
9483         .commit_setup   = nfs4_proc_commit_setup,
9484         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
9485         .commit_done    = nfs4_commit_done,
9486         .lock           = nfs4_proc_lock,
9487         .clear_acl_cache = nfs4_zap_acl_attr,
9488         .close_context  = nfs4_close_context,
9489         .open_context   = nfs4_atomic_open,
9490         .have_delegation = nfs4_have_delegation,
9491         .return_delegation = nfs4_inode_return_delegation,
9492         .alloc_client   = nfs4_alloc_client,
9493         .init_client    = nfs4_init_client,
9494         .free_client    = nfs4_free_client,
9495         .create_server  = nfs4_create_server,
9496         .clone_server   = nfs_clone_server,
9497 };
9498
9499 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
9500         .name   = XATTR_NAME_NFSV4_ACL,
9501         .list   = nfs4_xattr_list_nfs4_acl,
9502         .get    = nfs4_xattr_get_nfs4_acl,
9503         .set    = nfs4_xattr_set_nfs4_acl,
9504 };
9505
9506 const struct xattr_handler *nfs4_xattr_handlers[] = {
9507         &nfs4_xattr_nfs4_acl_handler,
9508 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
9509         &nfs4_xattr_nfs4_label_handler,
9510 #endif
9511         NULL
9512 };
9513
9514 /*
9515  * Local variables:
9516  *  c-basic-offset: 8
9517  * End:
9518  */