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/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  76
  77 /* file attributes which can be mapped to nfs attributes */
  78 #define NFS4_VALID_ATTRS (ATTR_MODE \
  79         | ATTR_UID \
  80         | ATTR_GID \
  81         | ATTR_SIZE \
  82         | ATTR_ATIME \
  83         | ATTR_MTIME \
  84         | ATTR_CTIME \
  85         | ATTR_ATIME_SET \
  86         | ATTR_MTIME_SET)
  87
  88 struct nfs4_opendata;
  89 static int _nfs4_proc_open(struct nfs4_opendata *data);
  90 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  91 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  92 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  93 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  95 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  96                             struct nfs_fattr *fattr, struct iattr *sattr,
  97                             struct nfs4_state *state, struct nfs4_label *ilabel,
  98                             struct nfs4_label *olabel);
  99 #ifdef CONFIG_NFS_V4_1
 100 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 101                 struct rpc_cred *);
 102 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 103                 struct rpc_cred *, bool);
 104 #endif
 105
 106 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 107 static inline struct nfs4_label *
 108 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 109         struct iattr *sattr, struct nfs4_label *label)
 110 {
 111         int err;
 112
 113         if (label == NULL)
 114                 return NULL;
 115
 116         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 117                 return NULL;
 118
 119         err = security_dentry_init_security(dentry, sattr->ia_mode,
 120                                 &dentry->d_name, (void **)&label->label, &label->len);
 121         if (err == 0)
 122                 return label;
 123
 124         return NULL;
 125 }
 126 static inline void
 127 nfs4_label_release_security(struct nfs4_label *label)
 128 {
 129         if (label)
 130                 security_release_secctx(label->label, label->len);
 131 }
 132 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 133 {
 134         if (label)
 135                 return server->attr_bitmask;
 136
 137         return server->attr_bitmask_nl;
 138 }
 139 #else
 140 static inline struct nfs4_label *
 141 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 142         struct iattr *sattr, struct nfs4_label *l)
 143 { return NULL; }
 144 static inline void
 145 nfs4_label_release_security(struct nfs4_label *label)
 146 { return; }
 147 static inline u32 *
 148 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 149 { return server->attr_bitmask; }
 150 #endif
 151
 152 /* Prevent leaks of NFSv4 errors into userland */
 153 static int nfs4_map_errors(int err)
 154 {
 155         if (err >= -1000)
 156                 return err;
 157         switch (err) {
 158         case -NFS4ERR_RESOURCE:
 159         case -NFS4ERR_LAYOUTTRYLATER:
 160         case -NFS4ERR_RECALLCONFLICT:
 161                 return -EREMOTEIO;
 162         case -NFS4ERR_WRONGSEC:
 163         case -NFS4ERR_WRONG_CRED:
 164                 return -EPERM;
 165         case -NFS4ERR_BADOWNER:
 166         case -NFS4ERR_BADNAME:
 167                 return -EINVAL;
 168         case -NFS4ERR_SHARE_DENIED:
 169                 return -EACCES;
 170         case -NFS4ERR_MINOR_VERS_MISMATCH:
 171                 return -EPROTONOSUPPORT;
 172         case -NFS4ERR_FILE_OPEN:
 173                 return -EBUSY;
 174         default:
 175                 dprintk("%s could not handle NFSv4 error %d\n",
 176                                 __func__, -err);
 177                 break;
 178         }
 179         return -EIO;
 180 }
 181
 182 /*
 183  * This is our standard bitmap for GETATTR requests.
 184  */
 185 const u32 nfs4_fattr_bitmap[3] = {
 186         FATTR4_WORD0_TYPE
 187         | FATTR4_WORD0_CHANGE
 188         | FATTR4_WORD0_SIZE
 189         | FATTR4_WORD0_FSID
 190         | FATTR4_WORD0_FILEID,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 201 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 202         FATTR4_WORD2_SECURITY_LABEL
 203 #endif
 204 };
 205
 206 static const u32 nfs4_pnfs_open_bitmap[3] = {
 207         FATTR4_WORD0_TYPE
 208         | FATTR4_WORD0_CHANGE
 209         | FATTR4_WORD0_SIZE
 210         | FATTR4_WORD0_FSID
 211         | FATTR4_WORD0_FILEID,
 212         FATTR4_WORD1_MODE
 213         | FATTR4_WORD1_NUMLINKS
 214         | FATTR4_WORD1_OWNER
 215         | FATTR4_WORD1_OWNER_GROUP
 216         | FATTR4_WORD1_RAWDEV
 217         | FATTR4_WORD1_SPACE_USED
 218         | FATTR4_WORD1_TIME_ACCESS
 219         | FATTR4_WORD1_TIME_METADATA
 220         | FATTR4_WORD1_TIME_MODIFY,
 221         FATTR4_WORD2_MDSTHRESHOLD
 222 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 223         | FATTR4_WORD2_SECURITY_LABEL
 224 #endif
 225 };
 226
 227 static const u32 nfs4_open_noattr_bitmap[3] = {
 228         FATTR4_WORD0_TYPE
 229         | FATTR4_WORD0_CHANGE
 230         | FATTR4_WORD0_FILEID,
 231 };
 232
 233 const u32 nfs4_statfs_bitmap[3] = {
 234         FATTR4_WORD0_FILES_AVAIL
 235         | FATTR4_WORD0_FILES_FREE
 236         | FATTR4_WORD0_FILES_TOTAL,
 237         FATTR4_WORD1_SPACE_AVAIL
 238         | FATTR4_WORD1_SPACE_FREE
 239         | FATTR4_WORD1_SPACE_TOTAL
 240 };
 241
 242 const u32 nfs4_pathconf_bitmap[3] = {
 243         FATTR4_WORD0_MAXLINK
 244         | FATTR4_WORD0_MAXNAME,
 245         0
 246 };
 247
 248 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 249                         | FATTR4_WORD0_MAXREAD
 250                         | FATTR4_WORD0_MAXWRITE
 251                         | FATTR4_WORD0_LEASE_TIME,
 252                         FATTR4_WORD1_TIME_DELTA
 253                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 254                         FATTR4_WORD2_LAYOUT_BLKSIZE
 255                         | FATTR4_WORD2_CLONE_BLKSIZE
 256 };
 257
 258 const u32 nfs4_fs_locations_bitmap[3] = {
 259         FATTR4_WORD0_TYPE
 260         | FATTR4_WORD0_CHANGE
 261         | FATTR4_WORD0_SIZE
 262         | FATTR4_WORD0_FSID
 263         | FATTR4_WORD0_FILEID
 264         | FATTR4_WORD0_FS_LOCATIONS,
 265         FATTR4_WORD1_MODE
 266         | FATTR4_WORD1_NUMLINKS
 267         | FATTR4_WORD1_OWNER
 268         | FATTR4_WORD1_OWNER_GROUP
 269         | FATTR4_WORD1_RAWDEV
 270         | FATTR4_WORD1_SPACE_USED
 271         | FATTR4_WORD1_TIME_ACCESS
 272         | FATTR4_WORD1_TIME_METADATA
 273         | FATTR4_WORD1_TIME_MODIFY
 274         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 275 };
 276
 277 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 278                 struct nfs4_readdir_arg *readdir)
 279 {
 280         __be32 *start, *p;
 281
 282         if (cookie > 2) {
 283                 readdir->cookie = cookie;
 284                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 285                 return;
 286         }
 287
 288         readdir->cookie = 0;
 289         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 290         if (cookie == 2)
 291                 return;
 292
 293         /*
 294          * NFSv4 servers do not return entries for '.' and '..'
 295          * Therefore, we fake these entries here.  We let '.'
 296          * have cookie 0 and '..' have cookie 1.  Note that
 297          * when talking to the server, we always send cookie 0
 298          * instead of 1 or 2.
 299          */
 300         start = p = kmap_atomic(*readdir->pages);
 301
 302         if (cookie == 0) {
 303                 *p++ = xdr_one;                                  /* next */
 304                 *p++ = xdr_zero;                   /* cookie, first word */
 305                 *p++ = xdr_one;                   /* cookie, second word */
 306                 *p++ = xdr_one;                             /* entry len */
 307                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 308                 p++;
 309                 *p++ = xdr_one;                         /* bitmap length */
 310                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 311                 *p++ = htonl(8);              /* attribute buffer length */
 312                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 313         }
 314
 315         *p++ = xdr_one;                                  /* next */
 316         *p++ = xdr_zero;                   /* cookie, first word */
 317         *p++ = xdr_two;                   /* cookie, second word */
 318         *p++ = xdr_two;                             /* entry len */
 319         memcpy(p, "..\0\0", 4);                         /* entry */
 320         p++;
 321         *p++ = xdr_one;                         /* bitmap length */
 322         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 323         *p++ = htonl(8);              /* attribute buffer length */
 324         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 325
 326         readdir->pgbase = (char *)p - (char *)start;
 327         readdir->count -= readdir->pgbase;
 328         kunmap_atomic(start);
 329 }
 330
 331 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 332                 nfs4_stateid *stateid,
 333                 struct rpc_cred *cred)
 334 {
 335         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 336
 337         ops->test_and_free_expired(server, stateid, cred);
 338 }
 339
 340 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 341                 nfs4_stateid *stateid,
 342                 struct rpc_cred *cred)
 343 {
 344         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 345         nfs4_test_and_free_stateid(server, stateid, cred);
 346 }
 347
 348 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 349                 const nfs4_stateid *stateid,
 350                 struct rpc_cred *cred)
 351 {
 352         nfs4_stateid tmp;
 353
 354         nfs4_stateid_copy(&tmp, stateid);
 355         __nfs4_free_revoked_stateid(server, &tmp, cred);
 356 }
 357
 358 static long nfs4_update_delay(long *timeout)
 359 {
 360         long ret;
 361         if (!timeout)
 362                 return NFS4_POLL_RETRY_MAX;
 363         if (*timeout <= 0)
 364                 *timeout = NFS4_POLL_RETRY_MIN;
 365         if (*timeout > NFS4_POLL_RETRY_MAX)
 366                 *timeout = NFS4_POLL_RETRY_MAX;
 367         ret = *timeout;
 368         *timeout <<= 1;
 369         return ret;
 370 }
 371
 372 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 373 {
 374         int res = 0;
 375
 376         might_sleep();
 377
 378         freezable_schedule_timeout_killable_unsafe(
 379                 nfs4_update_delay(timeout));
 380         if (fatal_signal_pending(current))
 381                 res = -ERESTARTSYS;
 382         return res;
 383 }
 384
 385 /* This is the error handling routine for processes that are allowed
 386  * to sleep.
 387  */
 388 static int nfs4_do_handle_exception(struct nfs_server *server,
 389                 int errorcode, struct nfs4_exception *exception)
 390 {
 391         struct nfs_client *clp = server->nfs_client;
 392         struct nfs4_state *state = exception->state;
 393         const nfs4_stateid *stateid = exception->stateid;
 394         struct inode *inode = exception->inode;
 395         int ret = errorcode;
 396
 397         exception->delay = 0;
 398         exception->recovering = 0;
 399         exception->retry = 0;
 400
 401         if (stateid == NULL && state != NULL)
 402                 stateid = &state->stateid;
 403
 404         switch(errorcode) {
 405                 case 0:
 406                         return 0;
 407                 case -NFS4ERR_DELEG_REVOKED:
 408                 case -NFS4ERR_ADMIN_REVOKED:
 409                 case -NFS4ERR_EXPIRED:
 410                 case -NFS4ERR_BAD_STATEID:
 411                         if (inode != NULL && stateid != NULL) {
 412                                 nfs_inode_find_state_and_recover(inode,
 413                                                 stateid);
 414                                 goto wait_on_recovery;
 415                         }
 416                 case -NFS4ERR_OPENMODE:
 417                         if (inode) {
 418                                 int err;
 419
 420                                 err = nfs_async_inode_return_delegation(inode,
 421                                                 stateid);
 422                                 if (err == 0)
 423                                         goto wait_on_recovery;
 424                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 425                                         exception->retry = 1;
 426                                         break;
 427                                 }
 428                         }
 429                         if (state == NULL)
 430                                 break;
 431                         ret = nfs4_schedule_stateid_recovery(server, state);
 432                         if (ret < 0)
 433                                 break;
 434                         goto wait_on_recovery;
 435                 case -NFS4ERR_STALE_STATEID:
 436                 case -NFS4ERR_STALE_CLIENTID:
 437                         nfs4_schedule_lease_recovery(clp);
 438                         goto wait_on_recovery;
 439                 case -NFS4ERR_MOVED:
 440                         ret = nfs4_schedule_migration_recovery(server);
 441                         if (ret < 0)
 442                                 break;
 443                         goto wait_on_recovery;
 444                 case -NFS4ERR_LEASE_MOVED:
 445                         nfs4_schedule_lease_moved_recovery(clp);
 446                         goto wait_on_recovery;
 447 #if defined(CONFIG_NFS_V4_1)
 448                 case -NFS4ERR_BADSESSION:
 449                 case -NFS4ERR_BADSLOT:
 450                 case -NFS4ERR_BAD_HIGH_SLOT:
 451                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 452                 case -NFS4ERR_DEADSESSION:
 453                 case -NFS4ERR_SEQ_FALSE_RETRY:
 454                 case -NFS4ERR_SEQ_MISORDERED:
 455                         dprintk("%s ERROR: %d Reset session\n", __func__,
 456                                 errorcode);
 457                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 458                         goto wait_on_recovery;
 459 #endif /* defined(CONFIG_NFS_V4_1) */
 460                 case -NFS4ERR_FILE_OPEN:
 461                         if (exception->timeout > HZ) {
 462                                 /* We have retried a decent amount, time to
 463                                  * fail
 464                                  */
 465                                 ret = -EBUSY;
 466                                 break;
 467                         }
 468                 case -NFS4ERR_DELAY:
 469                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 470                 case -NFS4ERR_GRACE:
 471                 case -NFS4ERR_LAYOUTTRYLATER:
 472                 case -NFS4ERR_RECALLCONFLICT:
 473                         exception->delay = 1;
 474                         return 0;
 475
 476                 case -NFS4ERR_RETRY_UNCACHED_REP:
 477                 case -NFS4ERR_OLD_STATEID:
 478                         exception->retry = 1;
 479                         break;
 480                 case -NFS4ERR_BADOWNER:
 481                         /* The following works around a Linux server bug! */
 482                 case -NFS4ERR_BADNAME:
 483                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 484                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 485                                 exception->retry = 1;
 486                                 printk(KERN_WARNING "NFS: v4 server %s "
 487                                                 "does not accept raw "
 488                                                 "uid/gids. "
 489                                                 "Reenabling the idmapper.\n",
 490                                                 server->nfs_client->cl_hostname);
 491                         }
 492         }
 493         /* We failed to handle the error */
 494         return nfs4_map_errors(ret);
 495 wait_on_recovery:
 496         exception->recovering = 1;
 497         return 0;
 498 }
 499
 500 /* This is the error handling routine for processes that are allowed
 501  * to sleep.
 502  */
 503 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 504 {
 505         struct nfs_client *clp = server->nfs_client;
 506         int ret;
 507
 508         ret = nfs4_do_handle_exception(server, errorcode, exception);
 509         if (exception->delay) {
 510                 ret = nfs4_delay(server->client, &exception->timeout);
 511                 goto out_retry;
 512         }
 513         if (exception->recovering) {
 514                 ret = nfs4_wait_clnt_recover(clp);
 515                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 516                         return -EIO;
 517                 goto out_retry;
 518         }
 519         return ret;
 520 out_retry:
 521         if (ret == 0)
 522                 exception->retry = 1;
 523         return ret;
 524 }
 525
 526 static int
 527 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 528                 int errorcode, struct nfs4_exception *exception)
 529 {
 530         struct nfs_client *clp = server->nfs_client;
 531         int ret;
 532
 533         ret = nfs4_do_handle_exception(server, errorcode, exception);
 534         if (exception->delay) {
 535                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 536                 goto out_retry;
 537         }
 538         if (exception->recovering) {
 539                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 540                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 541                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 542                 goto out_retry;
 543         }
 544         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 545                 ret = -EIO;
 546         return ret;
 547 out_retry:
 548         if (ret == 0)
 549                 exception->retry = 1;
 550         return ret;
 551 }
 552
 553 static int
 554 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 555                         struct nfs4_state *state, long *timeout)
 556 {
 557         struct nfs4_exception exception = {
 558                 .state = state,
 559         };
 560
 561         if (task->tk_status >= 0)
 562                 return 0;
 563         if (timeout)
 564                 exception.timeout = *timeout;
 565         task->tk_status = nfs4_async_handle_exception(task, server,
 566                         task->tk_status,
 567                         &exception);
 568         if (exception.delay && timeout)
 569                 *timeout = exception.timeout;
 570         if (exception.retry)
 571                 return -EAGAIN;
 572         return 0;
 573 }
 574
 575 /*
 576  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 577  * or 'false' otherwise.
 578  */
 579 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 580 {
 581         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 582
 583         if (flavor == RPC_AUTH_GSS_KRB5I ||
 584             flavor == RPC_AUTH_GSS_KRB5P)
 585                 return true;
 586
 587         return false;
 588 }
 589
 590 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 591 {
 592         spin_lock(&clp->cl_lock);
 593         if (time_before(clp->cl_last_renewal,timestamp))
 594                 clp->cl_last_renewal = timestamp;
 595         spin_unlock(&clp->cl_lock);
 596 }
 597
 598 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 599 {
 600         struct nfs_client *clp = server->nfs_client;
 601
 602         if (!nfs4_has_session(clp))
 603                 do_renew_lease(clp, timestamp);
 604 }
 605
 606 struct nfs4_call_sync_data {
 607         const struct nfs_server *seq_server;
 608         struct nfs4_sequence_args *seq_args;
 609         struct nfs4_sequence_res *seq_res;
 610 };
 611
 612 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 613                         struct nfs4_sequence_res *res, int cache_reply)
 614 {
 615         args->sa_slot = NULL;
 616         args->sa_cache_this = cache_reply;
 617         args->sa_privileged = 0;
 618
 619         res->sr_slot = NULL;
 620 }
 621
 622 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 623 {
 624         args->sa_privileged = 1;
 625 }
 626
 627 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 628                          struct nfs4_sequence_args *args,
 629                          struct nfs4_sequence_res *res,
 630                          struct rpc_task *task)
 631 {
 632         struct nfs4_slot *slot;
 633
 634         /* slot already allocated? */
 635         if (res->sr_slot != NULL)
 636                 goto out_start;
 637
 638         spin_lock(&tbl->slot_tbl_lock);
 639         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 640                 goto out_sleep;
 641
 642         slot = nfs4_alloc_slot(tbl);
 643         if (IS_ERR(slot)) {
 644                 if (slot == ERR_PTR(-ENOMEM))
 645                         task->tk_timeout = HZ >> 2;
 646                 goto out_sleep;
 647         }
 648         spin_unlock(&tbl->slot_tbl_lock);
 649
 650         slot->privileged = args->sa_privileged ? 1 : 0;
 651         args->sa_slot = slot;
 652         res->sr_slot = slot;
 653
 654 out_start:
 655         rpc_call_start(task);
 656         return 0;
 657
 658 out_sleep:
 659         if (args->sa_privileged)
 660                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 661                                 NULL, RPC_PRIORITY_PRIVILEGED);
 662         else
 663                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 664         spin_unlock(&tbl->slot_tbl_lock);
 665         return -EAGAIN;
 666 }
 667 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 668
 669 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 670 {
 671         struct nfs4_slot *slot = res->sr_slot;
 672         struct nfs4_slot_table *tbl;
 673
 674         tbl = slot->table;
 675         spin_lock(&tbl->slot_tbl_lock);
 676         if (!nfs41_wake_and_assign_slot(tbl, slot))
 677                 nfs4_free_slot(tbl, slot);
 678         spin_unlock(&tbl->slot_tbl_lock);
 679
 680         res->sr_slot = NULL;
 681 }
 682
 683 static int nfs40_sequence_done(struct rpc_task *task,
 684                                struct nfs4_sequence_res *res)
 685 {
 686         if (res->sr_slot != NULL)
 687                 nfs40_sequence_free_slot(res);
 688         return 1;
 689 }
 690
 691 #if defined(CONFIG_NFS_V4_1)
 692
 693 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 694 {
 695         struct nfs4_session *session;
 696         struct nfs4_slot_table *tbl;
 697         struct nfs4_slot *slot = res->sr_slot;
 698         bool send_new_highest_used_slotid = false;
 699
 700         tbl = slot->table;
 701         session = tbl->session;
 702
 703         /* Bump the slot sequence number */
 704         if (slot->seq_done)
 705                 slot->seq_nr++;
 706         slot->seq_done = 0;
 707
 708         spin_lock(&tbl->slot_tbl_lock);
 709         /* Be nice to the server: try to ensure that the last transmitted
 710          * value for highest_user_slotid <= target_highest_slotid
 711          */
 712         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 713                 send_new_highest_used_slotid = true;
 714
 715         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 716                 send_new_highest_used_slotid = false;
 717                 goto out_unlock;
 718         }
 719         nfs4_free_slot(tbl, slot);
 720
 721         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 722                 send_new_highest_used_slotid = false;
 723 out_unlock:
 724         spin_unlock(&tbl->slot_tbl_lock);
 725         res->sr_slot = NULL;
 726         if (send_new_highest_used_slotid)
 727                 nfs41_notify_server(session->clp);
 728         if (waitqueue_active(&tbl->slot_waitq))
 729                 wake_up_all(&tbl->slot_waitq);
 730 }
 731
 732 static int nfs41_sequence_process(struct rpc_task *task,
 733                 struct nfs4_sequence_res *res)
 734 {
 735         struct nfs4_session *session;
 736         struct nfs4_slot *slot = res->sr_slot;
 737         struct nfs_client *clp;
 738         bool interrupted = false;
 739         int ret = 1;
 740
 741         if (slot == NULL)
 742                 goto out_noaction;
 743         /* don't increment the sequence number if the task wasn't sent */
 744         if (!RPC_WAS_SENT(task))
 745                 goto out;
 746
 747         session = slot->table->session;
 748
 749         if (slot->interrupted) {
 750                 slot->interrupted = 0;
 751                 interrupted = true;
 752         }
 753
 754         trace_nfs4_sequence_done(session, res);
 755         /* Check the SEQUENCE operation status */
 756         switch (res->sr_status) {
 757         case 0:
 758                 /* If previous op on slot was interrupted and we reused
 759                  * the seq# and got a reply from the cache, then retry
 760                  */
 761                 if (task->tk_status == -EREMOTEIO && interrupted) {
 762                         ++slot->seq_nr;
 763                         goto retry_nowait;
 764                 }
 765                 /* Update the slot's sequence and clientid lease timer */
 766                 slot->seq_done = 1;
 767                 clp = session->clp;
 768                 do_renew_lease(clp, res->sr_timestamp);
 769                 /* Check sequence flags */
 770                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 771                                 !!slot->privileged);
 772                 nfs41_update_target_slotid(slot->table, slot, res);
 773                 break;
 774         case 1:
 775                 /*
 776                  * sr_status remains 1 if an RPC level error occurred.
 777                  * The server may or may not have processed the sequence
 778                  * operation..
 779                  * Mark the slot as having hosted an interrupted RPC call.
 780                  */
 781                 slot->interrupted = 1;
 782                 goto out;
 783         case -NFS4ERR_DELAY:
 784                 /* The server detected a resend of the RPC call and
 785                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 786                  * of RFC5661.
 787                  */
 788                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 789                         __func__,
 790                         slot->slot_nr,
 791                         slot->seq_nr);
 792                 goto out_retry;
 793         case -NFS4ERR_BADSLOT:
 794                 /*
 795                  * The slot id we used was probably retired. Try again
 796                  * using a different slot id.
 797                  */
 798                 goto retry_nowait;
 799         case -NFS4ERR_SEQ_MISORDERED:
 800                 /*
 801                  * Was the last operation on this sequence interrupted?
 802                  * If so, retry after bumping the sequence number.
 803                  */
 804                 if (interrupted) {
 805                         ++slot->seq_nr;
 806                         goto retry_nowait;
 807                 }
 808                 /*
 809                  * Could this slot have been previously retired?
 810                  * If so, then the server may be expecting seq_nr = 1!
 811                  */
 812                 if (slot->seq_nr != 1) {
 813                         slot->seq_nr = 1;
 814                         goto retry_nowait;
 815                 }
 816                 break;
 817         case -NFS4ERR_SEQ_FALSE_RETRY:
 818                 ++slot->seq_nr;
 819                 goto retry_nowait;
 820         default:
 821                 /* Just update the slot sequence no. */
 822                 slot->seq_done = 1;
 823         }
 824 out:
 825         /* The session may be reset by one of the error handlers. */
 826         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 827 out_noaction:
 828         return ret;
 829 retry_nowait:
 830         if (rpc_restart_call_prepare(task)) {
 831                 nfs41_sequence_free_slot(res);
 832                 task->tk_status = 0;
 833                 ret = 0;
 834         }
 835         goto out;
 836 out_retry:
 837         if (!rpc_restart_call(task))
 838                 goto out;
 839         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 840         return 0;
 841 }
 842
 843 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 844 {
 845         if (!nfs41_sequence_process(task, res))
 846                 return 0;
 847         if (res->sr_slot != NULL)
 848                 nfs41_sequence_free_slot(res);
 849         return 1;
 850
 851 }
 852 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 853
 854 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 855 {
 856         if (res->sr_slot == NULL)
 857                 return 1;
 858         if (res->sr_slot->table->session != NULL)
 859                 return nfs41_sequence_process(task, res);
 860         return nfs40_sequence_done(task, res);
 861 }
 862
 863 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 864 {
 865         if (res->sr_slot != NULL) {
 866                 if (res->sr_slot->table->session != NULL)
 867                         nfs41_sequence_free_slot(res);
 868                 else
 869                         nfs40_sequence_free_slot(res);
 870         }
 871 }
 872
 873 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 874 {
 875         if (res->sr_slot == NULL)
 876                 return 1;
 877         if (!res->sr_slot->table->session)
 878                 return nfs40_sequence_done(task, res);
 879         return nfs41_sequence_done(task, res);
 880 }
 881 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 882
 883 int nfs41_setup_sequence(struct nfs4_session *session,
 884                                 struct nfs4_sequence_args *args,
 885                                 struct nfs4_sequence_res *res,
 886                                 struct rpc_task *task)
 887 {
 888         struct nfs4_slot *slot;
 889         struct nfs4_slot_table *tbl;
 890
 891         dprintk("--> %s\n", __func__);
 892         /* slot already allocated? */
 893         if (res->sr_slot != NULL)
 894                 goto out_success;
 895
 896         tbl = &session->fc_slot_table;
 897
 898         task->tk_timeout = 0;
 899
 900         spin_lock(&tbl->slot_tbl_lock);
 901         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 902             !args->sa_privileged) {
 903                 /* The state manager will wait until the slot table is empty */
 904                 dprintk("%s session is draining\n", __func__);
 905                 goto out_sleep;
 906         }
 907
 908         slot = nfs4_alloc_slot(tbl);
 909         if (IS_ERR(slot)) {
 910                 /* If out of memory, try again in 1/4 second */
 911                 if (slot == ERR_PTR(-ENOMEM))
 912                         task->tk_timeout = HZ >> 2;
 913                 dprintk("<-- %s: no free slots\n", __func__);
 914                 goto out_sleep;
 915         }
 916         spin_unlock(&tbl->slot_tbl_lock);
 917
 918         slot->privileged = args->sa_privileged ? 1 : 0;
 919         args->sa_slot = slot;
 920
 921         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 922                         slot->slot_nr, slot->seq_nr);
 923
 924         res->sr_slot = slot;
 925         res->sr_timestamp = jiffies;
 926         res->sr_status_flags = 0;
 927         /*
 928          * sr_status is only set in decode_sequence, and so will remain
 929          * set to 1 if an rpc level failure occurs.
 930          */
 931         res->sr_status = 1;
 932         trace_nfs4_setup_sequence(session, args);
 933 out_success:
 934         rpc_call_start(task);
 935         return 0;
 936 out_sleep:
 937         /* Privileged tasks are queued with top priority */
 938         if (args->sa_privileged)
 939                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 940                                 NULL, RPC_PRIORITY_PRIVILEGED);
 941         else
 942                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 943         spin_unlock(&tbl->slot_tbl_lock);
 944         return -EAGAIN;
 945 }
 946 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 947
 948 static int nfs4_setup_sequence(const struct nfs_server *server,
 949                                struct nfs4_sequence_args *args,
 950                                struct nfs4_sequence_res *res,
 951                                struct rpc_task *task)
 952 {
 953         struct nfs4_session *session = nfs4_get_session(server);
 954         int ret = 0;
 955
 956         if (!session)
 957                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 958                                             args, res, task);
 959
 960         dprintk("--> %s clp %p session %p sr_slot %u\n",
 961                 __func__, session->clp, session, res->sr_slot ?
 962                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 963
 964         ret = nfs41_setup_sequence(session, args, res, task);
 965
 966         dprintk("<-- %s status=%d\n", __func__, ret);
 967         return ret;
 968 }
 969
 970 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 971 {
 972         struct nfs4_call_sync_data *data = calldata;
 973         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 974
 975         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 976
 977         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 978 }
 979
 980 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 981 {
 982         struct nfs4_call_sync_data *data = calldata;
 983
 984         nfs41_sequence_done(task, data->seq_res);
 985 }
 986
 987 static const struct rpc_call_ops nfs41_call_sync_ops = {
 988         .rpc_call_prepare = nfs41_call_sync_prepare,
 989         .rpc_call_done = nfs41_call_sync_done,
 990 };
 991
 992 #else   /* !CONFIG_NFS_V4_1 */
 993
 994 static int nfs4_setup_sequence(const struct nfs_server *server,
 995                                struct nfs4_sequence_args *args,
 996                                struct nfs4_sequence_res *res,
 997                                struct rpc_task *task)
 998 {
 999         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
1000                                     args, res, task);
1001 }
1002
1003 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1004 {
1005         return nfs40_sequence_done(task, res);
1006 }
1007
1008 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1009 {
1010         if (res->sr_slot != NULL)
1011                 nfs40_sequence_free_slot(res);
1012 }
1013
1014 int nfs4_sequence_done(struct rpc_task *task,
1015                        struct nfs4_sequence_res *res)
1016 {
1017         return nfs40_sequence_done(task, res);
1018 }
1019 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1020
1021 #endif  /* !CONFIG_NFS_V4_1 */
1022
1023 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1024 {
1025         struct nfs4_call_sync_data *data = calldata;
1026         nfs4_setup_sequence(data->seq_server,
1027                                 data->seq_args, data->seq_res, task);
1028 }
1029
1030 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1031 {
1032         struct nfs4_call_sync_data *data = calldata;
1033         nfs4_sequence_done(task, data->seq_res);
1034 }
1035
1036 static const struct rpc_call_ops nfs40_call_sync_ops = {
1037         .rpc_call_prepare = nfs40_call_sync_prepare,
1038         .rpc_call_done = nfs40_call_sync_done,
1039 };
1040
1041 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1042                                    struct nfs_server *server,
1043                                    struct rpc_message *msg,
1044                                    struct nfs4_sequence_args *args,
1045                                    struct nfs4_sequence_res *res)
1046 {
1047         int ret;
1048         struct rpc_task *task;
1049         struct nfs_client *clp = server->nfs_client;
1050         struct nfs4_call_sync_data data = {
1051                 .seq_server = server,
1052                 .seq_args = args,
1053                 .seq_res = res,
1054         };
1055         struct rpc_task_setup task_setup = {
1056                 .rpc_client = clnt,
1057                 .rpc_message = msg,
1058                 .callback_ops = clp->cl_mvops->call_sync_ops,
1059                 .callback_data = &data
1060         };
1061
1062         task = rpc_run_task(&task_setup);
1063         if (IS_ERR(task))
1064                 ret = PTR_ERR(task);
1065         else {
1066                 ret = task->tk_status;
1067                 rpc_put_task(task);
1068         }
1069         return ret;
1070 }
1071
1072 int nfs4_call_sync(struct rpc_clnt *clnt,
1073                    struct nfs_server *server,
1074                    struct rpc_message *msg,
1075                    struct nfs4_sequence_args *args,
1076                    struct nfs4_sequence_res *res,
1077                    int cache_reply)
1078 {
1079         nfs4_init_sequence(args, res, cache_reply);
1080         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1081 }
1082
1083 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1084 {
1085         struct nfs_inode *nfsi = NFS_I(dir);
1086
1087         spin_lock(&dir->i_lock);
1088         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1089         if (!cinfo->atomic || cinfo->before != dir->i_version)
1090                 nfs_force_lookup_revalidate(dir);
1091         dir->i_version = cinfo->after;
1092         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1093         nfs_fscache_invalidate(dir);
1094         spin_unlock(&dir->i_lock);
1095 }
1096
1097 struct nfs4_opendata {
1098         struct kref kref;
1099         struct nfs_openargs o_arg;
1100         struct nfs_openres o_res;
1101         struct nfs_open_confirmargs c_arg;
1102         struct nfs_open_confirmres c_res;
1103         struct nfs4_string owner_name;
1104         struct nfs4_string group_name;
1105         struct nfs4_label *a_label;
1106         struct nfs_fattr f_attr;
1107         struct nfs4_label *f_label;
1108         struct dentry *dir;
1109         struct dentry *dentry;
1110         struct nfs4_state_owner *owner;
1111         struct nfs4_state *state;
1112         struct iattr attrs;
1113         unsigned long timestamp;
1114         unsigned int rpc_done : 1;
1115         unsigned int file_created : 1;
1116         unsigned int is_recover : 1;
1117         int rpc_status;
1118         int cancelled;
1119 };
1120
1121 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1122                 int err, struct nfs4_exception *exception)
1123 {
1124         if (err != -EINVAL)
1125                 return false;
1126         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1127                 return false;
1128         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1129         exception->retry = 1;
1130         return true;
1131 }
1132
1133 static u32
1134 nfs4_map_atomic_open_share(struct nfs_server *server,
1135                 fmode_t fmode, int openflags)
1136 {
1137         u32 res = 0;
1138
1139         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1140         case FMODE_READ:
1141                 res = NFS4_SHARE_ACCESS_READ;
1142                 break;
1143         case FMODE_WRITE:
1144                 res = NFS4_SHARE_ACCESS_WRITE;
1145                 break;
1146         case FMODE_READ|FMODE_WRITE:
1147                 res = NFS4_SHARE_ACCESS_BOTH;
1148         }
1149         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1150                 goto out;
1151         /* Want no delegation if we're using O_DIRECT */
1152         if (openflags & O_DIRECT)
1153                 res |= NFS4_SHARE_WANT_NO_DELEG;
1154 out:
1155         return res;
1156 }
1157
1158 static enum open_claim_type4
1159 nfs4_map_atomic_open_claim(struct nfs_server *server,
1160                 enum open_claim_type4 claim)
1161 {
1162         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1163                 return claim;
1164         switch (claim) {
1165         default:
1166                 return claim;
1167         case NFS4_OPEN_CLAIM_FH:
1168                 return NFS4_OPEN_CLAIM_NULL;
1169         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1170                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1171         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1172                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1173         }
1174 }
1175
1176 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1177 {
1178         p->o_res.f_attr = &p->f_attr;
1179         p->o_res.f_label = p->f_label;
1180         p->o_res.seqid = p->o_arg.seqid;
1181         p->c_res.seqid = p->c_arg.seqid;
1182         p->o_res.server = p->o_arg.server;
1183         p->o_res.access_request = p->o_arg.access;
1184         nfs_fattr_init(&p->f_attr);
1185         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1186 }
1187
1188 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1189                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1190                 const struct iattr *attrs,
1191                 struct nfs4_label *label,
1192                 enum open_claim_type4 claim,
1193                 gfp_t gfp_mask)
1194 {
1195         struct dentry *parent = dget_parent(dentry);
1196         struct inode *dir = d_inode(parent);
1197         struct nfs_server *server = NFS_SERVER(dir);
1198         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1199         struct nfs4_opendata *p;
1200
1201         p = kzalloc(sizeof(*p), gfp_mask);
1202         if (p == NULL)
1203                 goto err;
1204
1205         p->f_label = nfs4_label_alloc(server, gfp_mask);
1206         if (IS_ERR(p->f_label))
1207                 goto err_free_p;
1208
1209         p->a_label = nfs4_label_alloc(server, gfp_mask);
1210         if (IS_ERR(p->a_label))
1211                 goto err_free_f;
1212
1213         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1214         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1215         if (IS_ERR(p->o_arg.seqid))
1216                 goto err_free_label;
1217         nfs_sb_active(dentry->d_sb);
1218         p->dentry = dget(dentry);
1219         p->dir = parent;
1220         p->owner = sp;
1221         atomic_inc(&sp->so_count);
1222         p->o_arg.open_flags = flags;
1223         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1224         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1225                         fmode, flags);
1226         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1227          * will return permission denied for all bits until close */
1228         if (!(flags & O_EXCL)) {
1229                 /* ask server to check for all possible rights as results
1230                  * are cached */
1231                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1232                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1233         }
1234         p->o_arg.clientid = server->nfs_client->cl_clientid;
1235         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1236         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1237         p->o_arg.name = &dentry->d_name;
1238         p->o_arg.server = server;
1239         p->o_arg.bitmask = nfs4_bitmask(server, label);
1240         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1241         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1242         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1243         switch (p->o_arg.claim) {
1244         case NFS4_OPEN_CLAIM_NULL:
1245         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1246         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1247                 p->o_arg.fh = NFS_FH(dir);
1248                 break;
1249         case NFS4_OPEN_CLAIM_PREVIOUS:
1250         case NFS4_OPEN_CLAIM_FH:
1251         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1252         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1253                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1254         }
1255         if (attrs != NULL && attrs->ia_valid != 0) {
1256                 __u32 verf[2];
1257
1258                 p->o_arg.u.attrs = &p->attrs;
1259                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1260
1261                 verf[0] = jiffies;
1262                 verf[1] = current->pid;
1263                 memcpy(p->o_arg.u.verifier.data, verf,
1264                                 sizeof(p->o_arg.u.verifier.data));
1265         }
1266         p->c_arg.fh = &p->o_res.fh;
1267         p->c_arg.stateid = &p->o_res.stateid;
1268         p->c_arg.seqid = p->o_arg.seqid;
1269         nfs4_init_opendata_res(p);
1270         kref_init(&p->kref);
1271         return p;
1272
1273 err_free_label:
1274         nfs4_label_free(p->a_label);
1275 err_free_f:
1276         nfs4_label_free(p->f_label);
1277 err_free_p:
1278         kfree(p);
1279 err:
1280         dput(parent);
1281         return NULL;
1282 }
1283
1284 static void nfs4_opendata_free(struct kref *kref)
1285 {
1286         struct nfs4_opendata *p = container_of(kref,
1287                         struct nfs4_opendata, kref);
1288         struct super_block *sb = p->dentry->d_sb;
1289
1290         nfs_free_seqid(p->o_arg.seqid);
1291         nfs4_sequence_free_slot(&p->o_res.seq_res);
1292         if (p->state != NULL)
1293                 nfs4_put_open_state(p->state);
1294         nfs4_put_state_owner(p->owner);
1295
1296         nfs4_label_free(p->a_label);
1297         nfs4_label_free(p->f_label);
1298
1299         dput(p->dir);
1300         dput(p->dentry);
1301         nfs_sb_deactive(sb);
1302         nfs_fattr_free_names(&p->f_attr);
1303         kfree(p->f_attr.mdsthreshold);
1304         kfree(p);
1305 }
1306
1307 static void nfs4_opendata_put(struct nfs4_opendata *p)
1308 {
1309         if (p != NULL)
1310                 kref_put(&p->kref, nfs4_opendata_free);
1311 }
1312
1313 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1314 {
1315         int ret;
1316
1317         ret = rpc_wait_for_completion_task(task);
1318         return ret;
1319 }
1320
1321 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1322                 fmode_t fmode)
1323 {
1324         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1325         case FMODE_READ|FMODE_WRITE:
1326                 return state->n_rdwr != 0;
1327         case FMODE_WRITE:
1328                 return state->n_wronly != 0;
1329         case FMODE_READ:
1330                 return state->n_rdonly != 0;
1331         }
1332         WARN_ON_ONCE(1);
1333         return false;
1334 }
1335
1336 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1337 {
1338         int ret = 0;
1339
1340         if (open_mode & (O_EXCL|O_TRUNC))
1341                 goto out;
1342         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1343                 case FMODE_READ:
1344                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1345                                 && state->n_rdonly != 0;
1346                         break;
1347                 case FMODE_WRITE:
1348                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1349                                 && state->n_wronly != 0;
1350                         break;
1351                 case FMODE_READ|FMODE_WRITE:
1352                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1353                                 && state->n_rdwr != 0;
1354         }
1355 out:
1356         return ret;
1357 }
1358
1359 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1360                 enum open_claim_type4 claim)
1361 {
1362         if (delegation == NULL)
1363                 return 0;
1364         if ((delegation->type & fmode) != fmode)
1365                 return 0;
1366         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1367                 return 0;
1368         switch (claim) {
1369         case NFS4_OPEN_CLAIM_NULL:
1370         case NFS4_OPEN_CLAIM_FH:
1371                 break;
1372         case NFS4_OPEN_CLAIM_PREVIOUS:
1373                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1374                         break;
1375         default:
1376                 return 0;
1377         }
1378         nfs_mark_delegation_referenced(delegation);
1379         return 1;
1380 }
1381
1382 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1383 {
1384         switch (fmode) {
1385                 case FMODE_WRITE:
1386                         state->n_wronly++;
1387                         break;
1388                 case FMODE_READ:
1389                         state->n_rdonly++;
1390                         break;
1391                 case FMODE_READ|FMODE_WRITE:
1392                         state->n_rdwr++;
1393         }
1394         nfs4_state_set_mode_locked(state, state->state | fmode);
1395 }
1396
1397 #ifdef CONFIG_NFS_V4_1
1398 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1399 {
1400         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1401                 return true;
1402         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1403                 return true;
1404         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1405                 return true;
1406         return false;
1407 }
1408 #endif /* CONFIG_NFS_V4_1 */
1409
1410 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1411 {
1412         struct nfs_client *clp = state->owner->so_server->nfs_client;
1413         bool need_recover = false;
1414
1415         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1416                 need_recover = true;
1417         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1418                 need_recover = true;
1419         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1420                 need_recover = true;
1421         if (need_recover)
1422                 nfs4_state_mark_reclaim_nograce(clp, state);
1423 }
1424
1425 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1426                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1427 {
1428         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1429                 return true;
1430         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1431                 nfs4_stateid_copy(freeme, &state->open_stateid);
1432                 nfs_test_and_clear_all_open_stateid(state);
1433                 return true;
1434         }
1435         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1436                 return true;
1437         return false;
1438 }
1439
1440 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1441 {
1442         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1443                 return;
1444         if (state->n_wronly)
1445                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1446         if (state->n_rdonly)
1447                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1448         if (state->n_rdwr)
1449                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1450         set_bit(NFS_OPEN_STATE, &state->flags);
1451 }
1452
1453 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1454                 nfs4_stateid *stateid, fmode_t fmode)
1455 {
1456         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1457         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1458         case FMODE_WRITE:
1459                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1460                 break;
1461         case FMODE_READ:
1462                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1463                 break;
1464         case 0:
1465                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1466                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1467                 clear_bit(NFS_OPEN_STATE, &state->flags);
1468         }
1469         if (stateid == NULL)
1470                 return;
1471         /* Handle OPEN+OPEN_DOWNGRADE races */
1472         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1473             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1474                 nfs_resync_open_stateid_locked(state);
1475                 return;
1476         }
1477         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1478                 nfs4_stateid_copy(&state->stateid, stateid);
1479         nfs4_stateid_copy(&state->open_stateid, stateid);
1480 }
1481
1482 static void nfs_clear_open_stateid(struct nfs4_state *state,
1483         nfs4_stateid *arg_stateid,
1484         nfs4_stateid *stateid, fmode_t fmode)
1485 {
1486         write_seqlock(&state->seqlock);
1487         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1488         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1489                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1490         write_sequnlock(&state->seqlock);
1491         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1492                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1493 }
1494
1495 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1496                 const nfs4_stateid *stateid, fmode_t fmode,
1497                 nfs4_stateid *freeme)
1498 {
1499         switch (fmode) {
1500                 case FMODE_READ:
1501                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1502                         break;
1503                 case FMODE_WRITE:
1504                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1505                         break;
1506                 case FMODE_READ|FMODE_WRITE:
1507                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1508         }
1509         if (!nfs_need_update_open_stateid(state, stateid, freeme))
1510                 return;
1511         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1512                 nfs4_stateid_copy(&state->stateid, stateid);
1513         nfs4_stateid_copy(&state->open_stateid, stateid);
1514 }
1515
1516 static void __update_open_stateid(struct nfs4_state *state,
1517                 const nfs4_stateid *open_stateid,
1518                 const nfs4_stateid *deleg_stateid,
1519                 fmode_t fmode,
1520                 nfs4_stateid *freeme)
1521 {
1522         /*
1523          * Protect the call to nfs4_state_set_mode_locked and
1524          * serialise the stateid update
1525          */
1526         spin_lock(&state->owner->so_lock);
1527         write_seqlock(&state->seqlock);
1528         if (deleg_stateid != NULL) {
1529                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1530                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1531         }
1532         if (open_stateid != NULL)
1533                 nfs_set_open_stateid_locked(state, open_stateid, fmode, freeme);
1534         write_sequnlock(&state->seqlock);
1535         update_open_stateflags(state, fmode);
1536         spin_unlock(&state->owner->so_lock);
1537 }
1538
1539 static int update_open_stateid(struct nfs4_state *state,
1540                 const nfs4_stateid *open_stateid,
1541                 const nfs4_stateid *delegation,
1542                 fmode_t fmode)
1543 {
1544         struct nfs_server *server = NFS_SERVER(state->inode);
1545         struct nfs_client *clp = server->nfs_client;
1546         struct nfs_inode *nfsi = NFS_I(state->inode);
1547         struct nfs_delegation *deleg_cur;
1548         nfs4_stateid freeme = { };
1549         int ret = 0;
1550
1551         fmode &= (FMODE_READ|FMODE_WRITE);
1552
1553         rcu_read_lock();
1554         deleg_cur = rcu_dereference(nfsi->delegation);
1555         if (deleg_cur == NULL)
1556                 goto no_delegation;
1557
1558         spin_lock(&deleg_cur->lock);
1559         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1560            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1561             (deleg_cur->type & fmode) != fmode)
1562                 goto no_delegation_unlock;
1563
1564         if (delegation == NULL)
1565                 delegation = &deleg_cur->stateid;
1566         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1567                 goto no_delegation_unlock;
1568
1569         nfs_mark_delegation_referenced(deleg_cur);
1570         __update_open_stateid(state, open_stateid, &deleg_cur->stateid,
1571                         fmode, &freeme);
1572         ret = 1;
1573 no_delegation_unlock:
1574         spin_unlock(&deleg_cur->lock);
1575 no_delegation:
1576         rcu_read_unlock();
1577
1578         if (!ret && open_stateid != NULL) {
1579                 __update_open_stateid(state, open_stateid, NULL, fmode, &freeme);
1580                 ret = 1;
1581         }
1582         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1583                 nfs4_schedule_state_manager(clp);
1584         if (freeme.type != 0)
1585                 nfs4_test_and_free_stateid(server, &freeme,
1586                                 state->owner->so_cred);
1587
1588         return ret;
1589 }
1590
1591 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1592                 const nfs4_stateid *stateid)
1593 {
1594         struct nfs4_state *state = lsp->ls_state;
1595         bool ret = false;
1596
1597         spin_lock(&state->state_lock);
1598         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1599                 goto out_noupdate;
1600         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1601                 goto out_noupdate;
1602         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1603         ret = true;
1604 out_noupdate:
1605         spin_unlock(&state->state_lock);
1606         return ret;
1607 }
1608
1609 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1610 {
1611         struct nfs_delegation *delegation;
1612
1613         rcu_read_lock();
1614         delegation = rcu_dereference(NFS_I(inode)->delegation);
1615         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1616                 rcu_read_unlock();
1617                 return;
1618         }
1619         rcu_read_unlock();
1620         nfs4_inode_return_delegation(inode);
1621 }
1622
1623 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1624 {
1625         struct nfs4_state *state = opendata->state;
1626         struct nfs_inode *nfsi = NFS_I(state->inode);
1627         struct nfs_delegation *delegation;
1628         int open_mode = opendata->o_arg.open_flags;
1629         fmode_t fmode = opendata->o_arg.fmode;
1630         enum open_claim_type4 claim = opendata->o_arg.claim;
1631         nfs4_stateid stateid;
1632         int ret = -EAGAIN;
1633
1634         for (;;) {
1635                 spin_lock(&state->owner->so_lock);
1636                 if (can_open_cached(state, fmode, open_mode)) {
1637                         update_open_stateflags(state, fmode);
1638                         spin_unlock(&state->owner->so_lock);
1639                         goto out_return_state;
1640                 }
1641                 spin_unlock(&state->owner->so_lock);
1642                 rcu_read_lock();
1643                 delegation = rcu_dereference(nfsi->delegation);
1644                 if (!can_open_delegated(delegation, fmode, claim)) {
1645                         rcu_read_unlock();
1646                         break;
1647                 }
1648                 /* Save the delegation */
1649                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1650                 rcu_read_unlock();
1651                 nfs_release_seqid(opendata->o_arg.seqid);
1652                 if (!opendata->is_recover) {
1653                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1654                         if (ret != 0)
1655                                 goto out;
1656                 }
1657                 ret = -EAGAIN;
1658
1659                 /* Try to update the stateid using the delegation */
1660                 if (update_open_stateid(state, NULL, &stateid, fmode))
1661                         goto out_return_state;
1662         }
1663 out:
1664         return ERR_PTR(ret);
1665 out_return_state:
1666         atomic_inc(&state->count);
1667         return state;
1668 }
1669
1670 static void
1671 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1672 {
1673         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1674         struct nfs_delegation *delegation;
1675         int delegation_flags = 0;
1676
1677         rcu_read_lock();
1678         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1679         if (delegation)
1680                 delegation_flags = delegation->flags;
1681         rcu_read_unlock();
1682         switch (data->o_arg.claim) {
1683         default:
1684                 break;
1685         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1686         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1687                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1688                                    "returning a delegation for "
1689                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1690                                    clp->cl_hostname);
1691                 return;
1692         }
1693         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1694                 nfs_inode_set_delegation(state->inode,
1695                                          data->owner->so_cred,
1696                                          &data->o_res);
1697         else
1698                 nfs_inode_reclaim_delegation(state->inode,
1699                                              data->owner->so_cred,
1700                                              &data->o_res);
1701 }
1702
1703 /*
1704  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1705  * and update the nfs4_state.
1706  */
1707 static struct nfs4_state *
1708 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1709 {
1710         struct inode *inode = data->state->inode;
1711         struct nfs4_state *state = data->state;
1712         int ret;
1713
1714         if (!data->rpc_done) {
1715                 if (data->rpc_status) {
1716                         ret = data->rpc_status;
1717                         goto err;
1718                 }
1719                 /* cached opens have already been processed */
1720                 goto update;
1721         }
1722
1723         ret = nfs_refresh_inode(inode, &data->f_attr);
1724         if (ret)
1725                 goto err;
1726
1727         if (data->o_res.delegation_type != 0)
1728                 nfs4_opendata_check_deleg(data, state);
1729 update:
1730         update_open_stateid(state, &data->o_res.stateid, NULL,
1731                             data->o_arg.fmode);
1732         atomic_inc(&state->count);
1733
1734         return state;
1735 err:
1736         return ERR_PTR(ret);
1737
1738 }
1739
1740 static struct nfs4_state *
1741 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1742 {
1743         struct inode *inode;
1744         struct nfs4_state *state = NULL;
1745         int ret;
1746
1747         if (!data->rpc_done) {
1748                 state = nfs4_try_open_cached(data);
1749                 trace_nfs4_cached_open(data->state);
1750                 goto out;
1751         }
1752
1753         ret = -EAGAIN;
1754         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1755                 goto err;
1756         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1757         ret = PTR_ERR(inode);
1758         if (IS_ERR(inode))
1759                 goto err;
1760         ret = -ENOMEM;
1761         state = nfs4_get_open_state(inode, data->owner);
1762         if (state == NULL)
1763                 goto err_put_inode;
1764         if (data->o_res.delegation_type != 0)
1765                 nfs4_opendata_check_deleg(data, state);
1766         update_open_stateid(state, &data->o_res.stateid, NULL,
1767                         data->o_arg.fmode);
1768         iput(inode);
1769 out:
1770         nfs_release_seqid(data->o_arg.seqid);
1771         return state;
1772 err_put_inode:
1773         iput(inode);
1774 err:
1775         return ERR_PTR(ret);
1776 }
1777
1778 static struct nfs4_state *
1779 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1780 {
1781         struct nfs4_state *ret;
1782
1783         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1784                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
1785         else
1786                 ret = _nfs4_opendata_to_nfs4_state(data);
1787         nfs4_sequence_free_slot(&data->o_res.seq_res);
1788         return ret;
1789 }
1790
1791 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1792 {
1793         struct nfs_inode *nfsi = NFS_I(state->inode);
1794         struct nfs_open_context *ctx;
1795
1796         spin_lock(&state->inode->i_lock);
1797         list_for_each_entry(ctx, &nfsi->open_files, list) {
1798                 if (ctx->state != state)
1799                         continue;
1800                 get_nfs_open_context(ctx);
1801                 spin_unlock(&state->inode->i_lock);
1802                 return ctx;
1803         }
1804         spin_unlock(&state->inode->i_lock);
1805         return ERR_PTR(-ENOENT);
1806 }
1807
1808 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1809                 struct nfs4_state *state, enum open_claim_type4 claim)
1810 {
1811         struct nfs4_opendata *opendata;
1812
1813         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1814                         NULL, NULL, claim, GFP_NOFS);
1815         if (opendata == NULL)
1816                 return ERR_PTR(-ENOMEM);
1817         opendata->state = state;
1818         atomic_inc(&state->count);
1819         return opendata;
1820 }
1821
1822 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1823                 fmode_t fmode)
1824 {
1825         struct nfs4_state *newstate;
1826         int ret;
1827
1828         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1829                 return 0;
1830         opendata->o_arg.open_flags = 0;
1831         opendata->o_arg.fmode = fmode;
1832         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1833                         NFS_SB(opendata->dentry->d_sb),
1834                         fmode, 0);
1835         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1836         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1837         nfs4_init_opendata_res(opendata);
1838         ret = _nfs4_recover_proc_open(opendata);
1839         if (ret != 0)
1840                 return ret;
1841         newstate = nfs4_opendata_to_nfs4_state(opendata);
1842         if (IS_ERR(newstate))
1843                 return PTR_ERR(newstate);
1844         if (newstate != opendata->state)
1845                 ret = -ESTALE;
1846         nfs4_close_state(newstate, fmode);
1847         return ret;
1848 }
1849
1850 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1851 {
1852         int ret;
1853
1854         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1855         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1856         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1857         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1858         /* memory barrier prior to reading state->n_* */
1859         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1860         clear_bit(NFS_OPEN_STATE, &state->flags);
1861         smp_rmb();
1862         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1863         if (ret != 0)
1864                 return ret;
1865         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1866         if (ret != 0)
1867                 return ret;
1868         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1869         if (ret != 0)
1870                 return ret;
1871         /*
1872          * We may have performed cached opens for all three recoveries.
1873          * Check if we need to update the current stateid.
1874          */
1875         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1876             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1877                 write_seqlock(&state->seqlock);
1878                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1879                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1880                 write_sequnlock(&state->seqlock);
1881         }
1882         return 0;
1883 }
1884
1885 /*
1886  * OPEN_RECLAIM:
1887  *      reclaim state on the server after a reboot.
1888  */
1889 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1890 {
1891         struct nfs_delegation *delegation;
1892         struct nfs4_opendata *opendata;
1893         fmode_t delegation_type = 0;
1894         int status;
1895
1896         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1897                         NFS4_OPEN_CLAIM_PREVIOUS);
1898         if (IS_ERR(opendata))
1899                 return PTR_ERR(opendata);
1900         rcu_read_lock();
1901         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1902         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1903                 delegation_type = delegation->type;
1904         rcu_read_unlock();
1905         opendata->o_arg.u.delegation_type = delegation_type;
1906         status = nfs4_open_recover(opendata, state);
1907         nfs4_opendata_put(opendata);
1908         return status;
1909 }
1910
1911 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1912 {
1913         struct nfs_server *server = NFS_SERVER(state->inode);
1914         struct nfs4_exception exception = { };
1915         int err;
1916         do {
1917                 err = _nfs4_do_open_reclaim(ctx, state);
1918                 trace_nfs4_open_reclaim(ctx, 0, err);
1919                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1920                         continue;
1921                 if (err != -NFS4ERR_DELAY)
1922                         break;
1923                 nfs4_handle_exception(server, err, &exception);
1924         } while (exception.retry);
1925         return err;
1926 }
1927
1928 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1929 {
1930         struct nfs_open_context *ctx;
1931         int ret;
1932
1933         ctx = nfs4_state_find_open_context(state);
1934         if (IS_ERR(ctx))
1935                 return -EAGAIN;
1936         ret = nfs4_do_open_reclaim(ctx, state);
1937         put_nfs_open_context(ctx);
1938         return ret;
1939 }
1940
1941 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1942 {
1943         switch (err) {
1944                 default:
1945                         printk(KERN_ERR "NFS: %s: unhandled error "
1946                                         "%d.\n", __func__, err);
1947                 case 0:
1948                 case -ENOENT:
1949                 case -EAGAIN:
1950                 case -ESTALE:
1951                         break;
1952                 case -NFS4ERR_BADSESSION:
1953                 case -NFS4ERR_BADSLOT:
1954                 case -NFS4ERR_BAD_HIGH_SLOT:
1955                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1956                 case -NFS4ERR_DEADSESSION:
1957                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1958                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1959                         return -EAGAIN;
1960                 case -NFS4ERR_STALE_CLIENTID:
1961                 case -NFS4ERR_STALE_STATEID:
1962                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1963                         /* Don't recall a delegation if it was lost */
1964                         nfs4_schedule_lease_recovery(server->nfs_client);
1965                         return -EAGAIN;
1966                 case -NFS4ERR_MOVED:
1967                         nfs4_schedule_migration_recovery(server);
1968                         return -EAGAIN;
1969                 case -NFS4ERR_LEASE_MOVED:
1970                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1971                         return -EAGAIN;
1972                 case -NFS4ERR_DELEG_REVOKED:
1973                 case -NFS4ERR_ADMIN_REVOKED:
1974                 case -NFS4ERR_EXPIRED:
1975                 case -NFS4ERR_BAD_STATEID:
1976                 case -NFS4ERR_OPENMODE:
1977                         nfs_inode_find_state_and_recover(state->inode,
1978                                         stateid);
1979                         nfs4_schedule_stateid_recovery(server, state);
1980                         return -EAGAIN;
1981                 case -NFS4ERR_DELAY:
1982                 case -NFS4ERR_GRACE:
1983                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1984                         ssleep(1);
1985                         return -EAGAIN;
1986                 case -ENOMEM:
1987                 case -NFS4ERR_DENIED:
1988                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1989                         return 0;
1990         }
1991         return err;
1992 }
1993
1994 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1995                 struct nfs4_state *state, const nfs4_stateid *stateid,
1996                 fmode_t type)
1997 {
1998         struct nfs_server *server = NFS_SERVER(state->inode);
1999         struct nfs4_opendata *opendata;
2000         int err = 0;
2001
2002         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2003                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2004         if (IS_ERR(opendata))
2005                 return PTR_ERR(opendata);
2006         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2007         write_seqlock(&state->seqlock);
2008         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2009         write_sequnlock(&state->seqlock);
2010         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2011         switch (type & (FMODE_READ|FMODE_WRITE)) {
2012         case FMODE_READ|FMODE_WRITE:
2013         case FMODE_WRITE:
2014                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2015                 if (err)
2016                         break;
2017                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2018                 if (err)
2019                         break;
2020         case FMODE_READ:
2021                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2022         }
2023         nfs4_opendata_put(opendata);
2024         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
2025 }
2026
2027 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2028 {
2029         struct nfs4_opendata *data = calldata;
2030
2031         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
2032                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
2033 }
2034
2035 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2036 {
2037         struct nfs4_opendata *data = calldata;
2038
2039         nfs40_sequence_done(task, &data->c_res.seq_res);
2040
2041         data->rpc_status = task->tk_status;
2042         if (data->rpc_status == 0) {
2043                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2044                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2045                 renew_lease(data->o_res.server, data->timestamp);
2046                 data->rpc_done = 1;
2047         }
2048 }
2049
2050 static void nfs4_open_confirm_release(void *calldata)
2051 {
2052         struct nfs4_opendata *data = calldata;
2053         struct nfs4_state *state = NULL;
2054
2055         /* If this request hasn't been cancelled, do nothing */
2056         if (data->cancelled == 0)
2057                 goto out_free;
2058         /* In case of error, no cleanup! */
2059         if (!data->rpc_done)
2060                 goto out_free;
2061         state = nfs4_opendata_to_nfs4_state(data);
2062         if (!IS_ERR(state))
2063                 nfs4_close_state(state, data->o_arg.fmode);
2064 out_free:
2065         nfs4_opendata_put(data);
2066 }
2067
2068 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2069         .rpc_call_prepare = nfs4_open_confirm_prepare,
2070         .rpc_call_done = nfs4_open_confirm_done,
2071         .rpc_release = nfs4_open_confirm_release,
2072 };
2073
2074 /*
2075  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2076  */
2077 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2078 {
2079         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2080         struct rpc_task *task;
2081         struct  rpc_message msg = {
2082                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2083                 .rpc_argp = &data->c_arg,
2084                 .rpc_resp = &data->c_res,
2085                 .rpc_cred = data->owner->so_cred,
2086         };
2087         struct rpc_task_setup task_setup_data = {
2088                 .rpc_client = server->client,
2089                 .rpc_message = &msg,
2090                 .callback_ops = &nfs4_open_confirm_ops,
2091                 .callback_data = data,
2092                 .workqueue = nfsiod_workqueue,
2093                 .flags = RPC_TASK_ASYNC,
2094         };
2095         int status;
2096
2097         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
2098         kref_get(&data->kref);
2099         data->rpc_done = 0;
2100         data->rpc_status = 0;
2101         data->timestamp = jiffies;
2102         if (data->is_recover)
2103                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
2104         task = rpc_run_task(&task_setup_data);
2105         if (IS_ERR(task))
2106                 return PTR_ERR(task);
2107         status = nfs4_wait_for_completion_rpc_task(task);
2108         if (status != 0) {
2109                 data->cancelled = 1;
2110                 smp_wmb();
2111         } else
2112                 status = data->rpc_status;
2113         rpc_put_task(task);
2114         return status;
2115 }
2116
2117 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2118 {
2119         struct nfs4_opendata *data = calldata;
2120         struct nfs4_state_owner *sp = data->owner;
2121         struct nfs_client *clp = sp->so_server->nfs_client;
2122         enum open_claim_type4 claim = data->o_arg.claim;
2123
2124         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2125                 goto out_wait;
2126         /*
2127          * Check if we still need to send an OPEN call, or if we can use
2128          * a delegation instead.
2129          */
2130         if (data->state != NULL) {
2131                 struct nfs_delegation *delegation;
2132
2133                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
2134                         goto out_no_action;
2135                 rcu_read_lock();
2136                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2137                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2138                         goto unlock_no_action;
2139                 rcu_read_unlock();
2140         }
2141         /* Update client id. */
2142         data->o_arg.clientid = clp->cl_clientid;
2143         switch (claim) {
2144         default:
2145                 break;
2146         case NFS4_OPEN_CLAIM_PREVIOUS:
2147         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2148         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2149                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2150         case NFS4_OPEN_CLAIM_FH:
2151                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2152                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
2153         }
2154         data->timestamp = jiffies;
2155         if (nfs4_setup_sequence(data->o_arg.server,
2156                                 &data->o_arg.seq_args,
2157                                 &data->o_res.seq_res,
2158                                 task) != 0)
2159                 nfs_release_seqid(data->o_arg.seqid);
2160
2161         /* Set the create mode (note dependency on the session type) */
2162         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2163         if (data->o_arg.open_flags & O_EXCL) {
2164                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2165                 if (nfs4_has_persistent_session(clp))
2166                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2167                 else if (clp->cl_mvops->minor_version > 0)
2168                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2169         }
2170         return;
2171 unlock_no_action:
2172         trace_nfs4_cached_open(data->state);
2173         rcu_read_unlock();
2174 out_no_action:
2175         task->tk_action = NULL;
2176 out_wait:
2177         nfs4_sequence_done(task, &data->o_res.seq_res);
2178 }
2179
2180 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2181 {
2182         struct nfs4_opendata *data = calldata;
2183
2184         data->rpc_status = task->tk_status;
2185
2186         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2187                 return;
2188
2189         if (task->tk_status == 0) {
2190                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2191                         switch (data->o_res.f_attr->mode & S_IFMT) {
2192                         case S_IFREG:
2193                                 break;
2194                         case S_IFLNK:
2195                                 data->rpc_status = -ELOOP;
2196                                 break;
2197                         case S_IFDIR:
2198                                 data->rpc_status = -EISDIR;
2199                                 break;
2200                         default:
2201                                 data->rpc_status = -ENOTDIR;
2202                         }
2203                 }
2204                 renew_lease(data->o_res.server, data->timestamp);
2205                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2206                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2207         }
2208         data->rpc_done = 1;
2209 }
2210
2211 static void nfs4_open_release(void *calldata)
2212 {
2213         struct nfs4_opendata *data = calldata;
2214         struct nfs4_state *state = NULL;
2215
2216         /* If this request hasn't been cancelled, do nothing */
2217         if (data->cancelled == 0)
2218                 goto out_free;
2219         /* In case of error, no cleanup! */
2220         if (data->rpc_status != 0 || !data->rpc_done)
2221                 goto out_free;
2222         /* In case we need an open_confirm, no cleanup! */
2223         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2224                 goto out_free;
2225         state = nfs4_opendata_to_nfs4_state(data);
2226         if (!IS_ERR(state))
2227                 nfs4_close_state(state, data->o_arg.fmode);
2228 out_free:
2229         nfs4_opendata_put(data);
2230 }
2231
2232 static const struct rpc_call_ops nfs4_open_ops = {
2233         .rpc_call_prepare = nfs4_open_prepare,
2234         .rpc_call_done = nfs4_open_done,
2235         .rpc_release = nfs4_open_release,
2236 };
2237
2238 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2239 {
2240         struct inode *dir = d_inode(data->dir);
2241         struct nfs_server *server = NFS_SERVER(dir);
2242         struct nfs_openargs *o_arg = &data->o_arg;
2243         struct nfs_openres *o_res = &data->o_res;
2244         struct rpc_task *task;
2245         struct rpc_message msg = {
2246                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2247                 .rpc_argp = o_arg,
2248                 .rpc_resp = o_res,
2249                 .rpc_cred = data->owner->so_cred,
2250         };
2251         struct rpc_task_setup task_setup_data = {
2252                 .rpc_client = server->client,
2253                 .rpc_message = &msg,
2254                 .callback_ops = &nfs4_open_ops,
2255                 .callback_data = data,
2256                 .workqueue = nfsiod_workqueue,
2257                 .flags = RPC_TASK_ASYNC,
2258         };
2259         int status;
2260
2261         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2262         kref_get(&data->kref);
2263         data->rpc_done = 0;
2264         data->rpc_status = 0;
2265         data->cancelled = 0;
2266         data->is_recover = 0;
2267         if (isrecover) {
2268                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2269                 data->is_recover = 1;
2270         }
2271         task = rpc_run_task(&task_setup_data);
2272         if (IS_ERR(task))
2273                 return PTR_ERR(task);
2274         status = nfs4_wait_for_completion_rpc_task(task);
2275         if (status != 0) {
2276                 data->cancelled = 1;
2277                 smp_wmb();
2278         } else
2279                 status = data->rpc_status;
2280         rpc_put_task(task);
2281
2282         return status;
2283 }
2284
2285 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2286 {
2287         struct inode *dir = d_inode(data->dir);
2288         struct nfs_openres *o_res = &data->o_res;
2289         int status;
2290
2291         status = nfs4_run_open_task(data, 1);
2292         if (status != 0 || !data->rpc_done)
2293                 return status;
2294
2295         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2296
2297         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2298                 status = _nfs4_proc_open_confirm(data);
2299                 if (status != 0)
2300                         return status;
2301         }
2302
2303         return status;
2304 }
2305
2306 /*
2307  * Additional permission checks in order to distinguish between an
2308  * open for read, and an open for execute. This works around the
2309  * fact that NFSv4 OPEN treats read and execute permissions as being
2310  * the same.
2311  * Note that in the non-execute case, we want to turn off permission
2312  * checking if we just created a new file (POSIX open() semantics).
2313  */
2314 static int nfs4_opendata_access(struct rpc_cred *cred,
2315                                 struct nfs4_opendata *opendata,
2316                                 struct nfs4_state *state, fmode_t fmode,
2317                                 int openflags)
2318 {
2319         struct nfs_access_entry cache;
2320         u32 mask;
2321
2322         /* access call failed or for some reason the server doesn't
2323          * support any access modes -- defer access call until later */
2324         if (opendata->o_res.access_supported == 0)
2325                 return 0;
2326
2327         mask = 0;
2328         /*
2329          * Use openflags to check for exec, because fmode won't
2330          * always have FMODE_EXEC set when file open for exec.
2331          */
2332         if (openflags & __FMODE_EXEC) {
2333                 /* ONLY check for exec rights */
2334                 mask = MAY_EXEC;
2335         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2336                 mask = MAY_READ;
2337
2338         cache.cred = cred;
2339         cache.jiffies = jiffies;
2340         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2341         nfs_access_add_cache(state->inode, &cache);
2342
2343         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2344                 return 0;
2345
2346         /* even though OPEN succeeded, access is denied. Close the file */
2347         nfs4_close_state(state, fmode);
2348         return -EACCES;
2349 }
2350
2351 /*
2352  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2353  */
2354 static int _nfs4_proc_open(struct nfs4_opendata *data)
2355 {
2356         struct inode *dir = d_inode(data->dir);
2357         struct nfs_server *server = NFS_SERVER(dir);
2358         struct nfs_openargs *o_arg = &data->o_arg;
2359         struct nfs_openres *o_res = &data->o_res;
2360         int status;
2361
2362         status = nfs4_run_open_task(data, 0);
2363         if (!data->rpc_done)
2364                 return status;
2365         if (status != 0) {
2366                 if (status == -NFS4ERR_BADNAME &&
2367                                 !(o_arg->open_flags & O_CREAT))
2368                         return -ENOENT;
2369                 return status;
2370         }
2371
2372         nfs_fattr_map_and_free_names(server, &data->f_attr);
2373
2374         if (o_arg->open_flags & O_CREAT) {
2375                 update_changeattr(dir, &o_res->cinfo);
2376                 if (o_arg->open_flags & O_EXCL)
2377                         data->file_created = 1;
2378                 else if (o_res->cinfo.before != o_res->cinfo.after)
2379                         data->file_created = 1;
2380         }
2381         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2382                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2383         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2384                 status = _nfs4_proc_open_confirm(data);
2385                 if (status != 0)
2386                         return status;
2387         }
2388         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2389                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2390         return 0;
2391 }
2392
2393 static int nfs4_recover_expired_lease(struct nfs_server *server)
2394 {
2395         return nfs4_client_recover_expired_lease(server->nfs_client);
2396 }
2397
2398 /*
2399  * OPEN_EXPIRED:
2400  *      reclaim state on the server after a network partition.
2401  *      Assumes caller holds the appropriate lock
2402  */
2403 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2404 {
2405         struct nfs4_opendata *opendata;
2406         int ret;
2407
2408         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2409                         NFS4_OPEN_CLAIM_FH);
2410         if (IS_ERR(opendata))
2411                 return PTR_ERR(opendata);
2412         ret = nfs4_open_recover(opendata, state);
2413         if (ret == -ESTALE)
2414                 d_drop(ctx->dentry);
2415         nfs4_opendata_put(opendata);
2416         return ret;
2417 }
2418
2419 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2420 {
2421         struct nfs_server *server = NFS_SERVER(state->inode);
2422         struct nfs4_exception exception = { };
2423         int err;
2424
2425         do {
2426                 err = _nfs4_open_expired(ctx, state);
2427                 trace_nfs4_open_expired(ctx, 0, err);
2428                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2429                         continue;
2430                 switch (err) {
2431                 default:
2432                         goto out;
2433                 case -NFS4ERR_GRACE:
2434                 case -NFS4ERR_DELAY:
2435                         nfs4_handle_exception(server, err, &exception);
2436                         err = 0;
2437                 }
2438         } while (exception.retry);
2439 out:
2440         return err;
2441 }
2442
2443 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2444 {
2445         struct nfs_open_context *ctx;
2446         int ret;
2447
2448         ctx = nfs4_state_find_open_context(state);
2449         if (IS_ERR(ctx))
2450                 return -EAGAIN;
2451         ret = nfs4_do_open_expired(ctx, state);
2452         put_nfs_open_context(ctx);
2453         return ret;
2454 }
2455
2456 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2457                 const nfs4_stateid *stateid)
2458 {
2459         nfs_remove_bad_delegation(state->inode, stateid);
2460         write_seqlock(&state->seqlock);
2461         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2462         write_sequnlock(&state->seqlock);
2463         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2464 }
2465
2466 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2467 {
2468         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2469                 nfs_finish_clear_delegation_stateid(state, NULL);
2470 }
2471
2472 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2473 {
2474         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2475         nfs40_clear_delegation_stateid(state);
2476         return nfs4_open_expired(sp, state);
2477 }
2478
2479 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2480                 nfs4_stateid *stateid,
2481                 struct rpc_cred *cred)
2482 {
2483         return -NFS4ERR_BAD_STATEID;
2484 }
2485
2486 #if defined(CONFIG_NFS_V4_1)
2487 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2488                 nfs4_stateid *stateid,
2489                 struct rpc_cred *cred)
2490 {
2491         int status;
2492
2493         switch (stateid->type) {
2494         default:
2495                 break;
2496         case NFS4_INVALID_STATEID_TYPE:
2497         case NFS4_SPECIAL_STATEID_TYPE:
2498                 return -NFS4ERR_BAD_STATEID;
2499         case NFS4_REVOKED_STATEID_TYPE:
2500                 goto out_free;
2501         }
2502
2503         status = nfs41_test_stateid(server, stateid, cred);
2504         switch (status) {
2505         case -NFS4ERR_EXPIRED:
2506         case -NFS4ERR_ADMIN_REVOKED:
2507         case -NFS4ERR_DELEG_REVOKED:
2508                 break;
2509         default:
2510                 return status;
2511         }
2512 out_free:
2513         /* Ack the revoked state to the server */
2514         nfs41_free_stateid(server, stateid, cred, true);
2515         return -NFS4ERR_EXPIRED;
2516 }
2517
2518 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2519 {
2520         struct nfs_server *server = NFS_SERVER(state->inode);
2521         nfs4_stateid stateid;
2522         struct nfs_delegation *delegation;
2523         struct rpc_cred *cred;
2524         int status;
2525
2526         /* Get the delegation credential for use by test/free_stateid */
2527         rcu_read_lock();
2528         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2529         if (delegation == NULL) {
2530                 rcu_read_unlock();
2531                 return;
2532         }
2533
2534         nfs4_stateid_copy(&stateid, &delegation->stateid);
2535         if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
2536                 rcu_read_unlock();
2537                 nfs_finish_clear_delegation_stateid(state, &stateid);
2538                 return;
2539         }
2540
2541         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) {
2542                 rcu_read_unlock();
2543                 return;
2544         }
2545
2546         cred = get_rpccred(delegation->cred);
2547         rcu_read_unlock();
2548         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2549         trace_nfs4_test_delegation_stateid(state, NULL, status);
2550         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2551                 nfs_finish_clear_delegation_stateid(state, &stateid);
2552
2553         put_rpccred(cred);
2554 }
2555
2556 /**
2557  * nfs41_check_expired_locks - possibly free a lock stateid
2558  *
2559  * @state: NFSv4 state for an inode
2560  *
2561  * Returns NFS_OK if recovery for this stateid is now finished.
2562  * Otherwise a negative NFS4ERR value is returned.
2563  */
2564 static int nfs41_check_expired_locks(struct nfs4_state *state)
2565 {
2566         int status, ret = NFS_OK;
2567         struct nfs4_lock_state *lsp, *prev = NULL;
2568         struct nfs_server *server = NFS_SERVER(state->inode);
2569
2570         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2571                 goto out;
2572
2573         spin_lock(&state->state_lock);
2574         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2575                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2576                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
2577
2578                         atomic_inc(&lsp->ls_count);
2579                         spin_unlock(&state->state_lock);
2580
2581                         nfs4_put_lock_state(prev);
2582                         prev = lsp;
2583
2584                         status = nfs41_test_and_free_expired_stateid(server,
2585                                         &lsp->ls_stateid,
2586                                         cred);
2587                         trace_nfs4_test_lock_stateid(state, lsp, status);
2588                         if (status == -NFS4ERR_EXPIRED ||
2589                             status == -NFS4ERR_BAD_STATEID) {
2590                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2591                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2592                                 if (!recover_lost_locks)
2593                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2594                         } else if (status != NFS_OK) {
2595                                 ret = status;
2596                                 nfs4_put_lock_state(prev);
2597                                 goto out;
2598                         }
2599                         spin_lock(&state->state_lock);
2600                 }
2601         }
2602         spin_unlock(&state->state_lock);
2603         nfs4_put_lock_state(prev);
2604 out:
2605         return ret;
2606 }
2607
2608 /**
2609  * nfs41_check_open_stateid - possibly free an open stateid
2610  *
2611  * @state: NFSv4 state for an inode
2612  *
2613  * Returns NFS_OK if recovery for this stateid is now finished.
2614  * Otherwise a negative NFS4ERR value is returned.
2615  */
2616 static int nfs41_check_open_stateid(struct nfs4_state *state)
2617 {
2618         struct nfs_server *server = NFS_SERVER(state->inode);
2619         nfs4_stateid *stateid = &state->open_stateid;
2620         struct rpc_cred *cred = state->owner->so_cred;
2621         int status;
2622
2623         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) {
2624                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)  {
2625                         if (nfs4_have_delegation(state->inode, state->state))
2626                                 return NFS_OK;
2627                         return -NFS4ERR_OPENMODE;
2628                 }
2629                 return -NFS4ERR_BAD_STATEID;
2630         }
2631         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2632         trace_nfs4_test_open_stateid(state, NULL, status);
2633         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2634                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2635                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2636                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2637                 clear_bit(NFS_OPEN_STATE, &state->flags);
2638                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2639         }
2640         if (status != NFS_OK)
2641                 return status;
2642         if (nfs_open_stateid_recover_openmode(state))
2643                 return -NFS4ERR_OPENMODE;
2644         return NFS_OK;
2645 }
2646
2647 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2648 {
2649         int status;
2650
2651         nfs41_check_delegation_stateid(state);
2652         status = nfs41_check_expired_locks(state);
2653         if (status != NFS_OK)
2654                 return status;
2655         status = nfs41_check_open_stateid(state);
2656         if (status != NFS_OK)
2657                 status = nfs4_open_expired(sp, state);
2658         return status;
2659 }
2660 #endif
2661
2662 /*
2663  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2664  * fields corresponding to attributes that were used to store the verifier.
2665  * Make sure we clobber those fields in the later setattr call
2666  */
2667 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2668                                 struct iattr *sattr, struct nfs4_label **label)
2669 {
2670         const u32 *attrset = opendata->o_res.attrset;
2671
2672         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2673             !(sattr->ia_valid & ATTR_ATIME_SET))
2674                 sattr->ia_valid |= ATTR_ATIME;
2675
2676         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2677             !(sattr->ia_valid & ATTR_MTIME_SET))
2678                 sattr->ia_valid |= ATTR_MTIME;
2679
2680         /* Except MODE, it seems harmless of setting twice. */
2681         if ((attrset[1] & FATTR4_WORD1_MODE))
2682                 sattr->ia_valid &= ~ATTR_MODE;
2683
2684         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2685                 *label = NULL;
2686 }
2687
2688 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2689                 fmode_t fmode,
2690                 int flags,
2691                 struct nfs_open_context *ctx)
2692 {
2693         struct nfs4_state_owner *sp = opendata->owner;
2694         struct nfs_server *server = sp->so_server;
2695         struct dentry *dentry;
2696         struct nfs4_state *state;
2697         unsigned int seq;
2698         int ret;
2699
2700         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2701
2702         ret = _nfs4_proc_open(opendata);
2703         if (ret != 0)
2704                 goto out;
2705
2706         state = nfs4_opendata_to_nfs4_state(opendata);
2707         ret = PTR_ERR(state);
2708         if (IS_ERR(state))
2709                 goto out;
2710         if (server->caps & NFS_CAP_POSIX_LOCK)
2711                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2712         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
2713                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
2714
2715         dentry = opendata->dentry;
2716         if (d_really_is_negative(dentry)) {
2717                 struct dentry *alias;
2718                 d_drop(dentry);
2719                 alias = d_exact_alias(dentry, state->inode);
2720                 if (!alias)
2721                         alias = d_splice_alias(igrab(state->inode), dentry);
2722                 /* d_splice_alias() can't fail here - it's a non-directory */
2723                 if (alias) {
2724                         dput(ctx->dentry);
2725                         ctx->dentry = dentry = alias;
2726                 }
2727                 nfs_set_verifier(dentry,
2728                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2729         }
2730
2731         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2732         if (ret != 0)
2733                 goto out;
2734
2735         ctx->state = state;
2736         if (d_inode(dentry) == state->inode) {
2737                 nfs_inode_attach_open_context(ctx);
2738                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2739                         nfs4_schedule_stateid_recovery(server, state);
2740         }
2741 out:
2742         return ret;
2743 }
2744
2745 /*
2746  * Returns a referenced nfs4_state
2747  */
2748 static int _nfs4_do_open(struct inode *dir,
2749                         struct nfs_open_context *ctx,
2750                         int flags,
2751                         struct iattr *sattr,
2752                         struct nfs4_label *label,
2753                         int *opened)
2754 {
2755         struct nfs4_state_owner  *sp;
2756         struct nfs4_state     *state = NULL;
2757         struct nfs_server       *server = NFS_SERVER(dir);
2758         struct nfs4_opendata *opendata;
2759         struct dentry *dentry = ctx->dentry;
2760         struct rpc_cred *cred = ctx->cred;
2761         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2762         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2763         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2764         struct nfs4_label *olabel = NULL;
2765         int status;
2766
2767         /* Protect against reboot recovery conflicts */
2768         status = -ENOMEM;
2769         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2770         if (sp == NULL) {
2771                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2772                 goto out_err;
2773         }
2774         status = nfs4_recover_expired_lease(server);
2775         if (status != 0)
2776                 goto err_put_state_owner;
2777         if (d_really_is_positive(dentry))
2778                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2779         status = -ENOMEM;
2780         if (d_really_is_positive(dentry))
2781                 claim = NFS4_OPEN_CLAIM_FH;
2782         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2783                         label, claim, GFP_KERNEL);
2784         if (opendata == NULL)
2785                 goto err_put_state_owner;
2786
2787         if (label) {
2788                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2789                 if (IS_ERR(olabel)) {
2790                         status = PTR_ERR(olabel);
2791                         goto err_opendata_put;
2792                 }
2793         }
2794
2795         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2796                 if (!opendata->f_attr.mdsthreshold) {
2797                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2798                         if (!opendata->f_attr.mdsthreshold)
2799                                 goto err_free_label;
2800                 }
2801                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2802         }
2803         if (d_really_is_positive(dentry))
2804                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2805
2806         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2807         if (status != 0)
2808                 goto err_free_label;
2809         state = ctx->state;
2810
2811         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2812             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2813                 nfs4_exclusive_attrset(opendata, sattr, &label);
2814                 /*
2815                  * send create attributes which was not set by open
2816                  * with an extra setattr.
2817                  */
2818                 if (sattr->ia_valid & NFS4_VALID_ATTRS) {
2819                         nfs_fattr_init(opendata->o_res.f_attr);
2820                         status = nfs4_do_setattr(state->inode, cred,
2821                                         opendata->o_res.f_attr, sattr,
2822                                         state, label, olabel);
2823                         if (status == 0) {
2824                                 nfs_setattr_update_inode(state->inode, sattr,
2825                                                 opendata->o_res.f_attr);
2826                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2827                         }
2828                 }
2829         }
2830         if (opened && opendata->file_created)
2831                 *opened |= FILE_CREATED;
2832
2833         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2834                 *ctx_th = opendata->f_attr.mdsthreshold;
2835                 opendata->f_attr.mdsthreshold = NULL;
2836         }
2837
2838         nfs4_label_free(olabel);
2839
2840         nfs4_opendata_put(opendata);
2841         nfs4_put_state_owner(sp);
2842         return 0;
2843 err_free_label:
2844         nfs4_label_free(olabel);
2845 err_opendata_put:
2846         nfs4_opendata_put(opendata);
2847 err_put_state_owner:
2848         nfs4_put_state_owner(sp);
2849 out_err:
2850         return status;
2851 }
2852
2853
2854 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2855                                         struct nfs_open_context *ctx,
2856                                         int flags,
2857                                         struct iattr *sattr,
2858                                         struct nfs4_label *label,
2859                                         int *opened)
2860 {
2861         struct nfs_server *server = NFS_SERVER(dir);
2862         struct nfs4_exception exception = { };
2863         struct nfs4_state *res;
2864         int status;
2865
2866         do {
2867                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2868                 res = ctx->state;
2869                 trace_nfs4_open_file(ctx, flags, status);
2870                 if (status == 0)
2871                         break;
2872                 /* NOTE: BAD_SEQID means the server and client disagree about the
2873                  * book-keeping w.r.t. state-changing operations
2874                  * (OPEN/CLOSE/LOCK/LOCKU...)
2875                  * It is actually a sign of a bug on the client or on the server.
2876                  *
2877                  * If we receive a BAD_SEQID error in the particular case of
2878                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2879                  * have unhashed the old state_owner for us, and that we can
2880                  * therefore safely retry using a new one. We should still warn
2881                  * the user though...
2882                  */
2883                 if (status == -NFS4ERR_BAD_SEQID) {
2884                         pr_warn_ratelimited("NFS: v4 server %s "
2885                                         " returned a bad sequence-id error!\n",
2886                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2887                         exception.retry = 1;
2888                         continue;
2889                 }
2890                 /*
2891                  * BAD_STATEID on OPEN means that the server cancelled our
2892                  * state before it received the OPEN_CONFIRM.
2893                  * Recover by retrying the request as per the discussion
2894                  * on Page 181 of RFC3530.
2895                  */
2896                 if (status == -NFS4ERR_BAD_STATEID) {
2897                         exception.retry = 1;
2898                         continue;
2899                 }
2900                 if (status == -EAGAIN) {
2901                         /* We must have found a delegation */
2902                         exception.retry = 1;
2903                         continue;
2904                 }
2905                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2906                         continue;
2907                 res = ERR_PTR(nfs4_handle_exception(server,
2908                                         status, &exception));
2909         } while (exception.retry);
2910         return res;
2911 }
2912
2913 static int _nfs4_do_setattr(struct inode *inode,
2914                             struct nfs_setattrargs *arg,
2915                             struct nfs_setattrres *res,
2916                             struct rpc_cred *cred,
2917                             struct nfs4_state *state)
2918 {
2919         struct nfs_server *server = NFS_SERVER(inode);
2920         struct rpc_message msg = {
2921                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2922                 .rpc_argp       = arg,
2923                 .rpc_resp       = res,
2924                 .rpc_cred       = cred,
2925         };
2926         struct rpc_cred *delegation_cred = NULL;
2927         unsigned long timestamp = jiffies;
2928         fmode_t fmode;
2929         bool truncate;
2930         int status;
2931
2932         nfs_fattr_init(res->fattr);
2933
2934         /* Servers should only apply open mode checks for file size changes */
2935         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
2936         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2937
2938         if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) {
2939                 /* Use that stateid */
2940         } else if (truncate && state != NULL) {
2941                 struct nfs_lockowner lockowner = {
2942                         .l_owner = current->files,
2943                         .l_pid = current->tgid,
2944                 };
2945                 if (!nfs4_valid_open_stateid(state))
2946                         return -EBADF;
2947                 if (nfs4_select_rw_stateid(state, FMODE_WRITE, &lockowner,
2948                                 &arg->stateid, &delegation_cred) == -EIO)
2949                         return -EBADF;
2950         } else
2951                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
2952         if (delegation_cred)
2953                 msg.rpc_cred = delegation_cred;
2954
2955         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
2956
2957         put_rpccred(delegation_cred);
2958         if (status == 0 && state != NULL)
2959                 renew_lease(server, timestamp);
2960         trace_nfs4_setattr(inode, &arg->stateid, status);
2961         return status;
2962 }
2963
2964 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2965                            struct nfs_fattr *fattr, struct iattr *sattr,
2966                            struct nfs4_state *state, struct nfs4_label *ilabel,
2967                            struct nfs4_label *olabel)
2968 {
2969         struct nfs_server *server = NFS_SERVER(inode);
2970         struct nfs_setattrargs  arg = {
2971                 .fh             = NFS_FH(inode),
2972                 .iap            = sattr,
2973                 .server         = server,
2974                 .bitmask = server->attr_bitmask,
2975                 .label          = ilabel,
2976         };
2977         struct nfs_setattrres  res = {
2978                 .fattr          = fattr,
2979                 .label          = olabel,
2980                 .server         = server,
2981         };
2982         struct nfs4_exception exception = {
2983                 .state = state,
2984                 .inode = inode,
2985                 .stateid = &arg.stateid,
2986         };
2987         int err;
2988
2989         arg.bitmask = nfs4_bitmask(server, ilabel);
2990         if (ilabel)
2991                 arg.bitmask = nfs4_bitmask(server, olabel);
2992
2993         do {
2994                 err = _nfs4_do_setattr(inode, &arg, &res, cred, state);
2995                 switch (err) {
2996                 case -NFS4ERR_OPENMODE:
2997                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2998                                 pr_warn_once("NFSv4: server %s is incorrectly "
2999                                                 "applying open mode checks to "
3000                                                 "a SETATTR that is not "
3001                                                 "changing file size.\n",
3002                                                 server->nfs_client->cl_hostname);
3003                         }
3004                         if (state && !(state->state & FMODE_WRITE)) {
3005                                 err = -EBADF;
3006                                 if (sattr->ia_valid & ATTR_OPEN)
3007                                         err = -EACCES;
3008                                 goto out;
3009                         }
3010                 }
3011                 err = nfs4_handle_exception(server, err, &exception);
3012         } while (exception.retry);
3013 out:
3014         return err;
3015 }
3016
3017 static bool
3018 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3019 {
3020         if (inode == NULL || !nfs_have_layout(inode))
3021                 return false;
3022
3023         return pnfs_wait_on_layoutreturn(inode, task);
3024 }
3025
3026 struct nfs4_closedata {
3027         struct inode *inode;
3028         struct nfs4_state *state;
3029         struct nfs_closeargs arg;
3030         struct nfs_closeres res;
3031         struct nfs_fattr fattr;
3032         unsigned long timestamp;
3033         bool roc;
3034         u32 roc_barrier;
3035 };
3036
3037 static void nfs4_free_closedata(void *data)
3038 {
3039         struct nfs4_closedata *calldata = data;
3040         struct nfs4_state_owner *sp = calldata->state->owner;
3041         struct super_block *sb = calldata->state->inode->i_sb;
3042
3043         if (calldata->roc)
3044                 pnfs_roc_release(calldata->state->inode);
3045         nfs4_put_open_state(calldata->state);
3046         nfs_free_seqid(calldata->arg.seqid);
3047         nfs4_put_state_owner(sp);
3048         nfs_sb_deactive(sb);
3049         kfree(calldata);
3050 }
3051
3052 static void nfs4_close_done(struct rpc_task *task, void *data)
3053 {
3054         struct nfs4_closedata *calldata = data;
3055         struct nfs4_state *state = calldata->state;
3056         struct nfs_server *server = NFS_SERVER(calldata->inode);
3057         nfs4_stateid *res_stateid = NULL;
3058
3059         dprintk("%s: begin!\n", __func__);
3060         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3061                 return;
3062         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3063         /* hmm. we are done with the inode, and in the process of freeing
3064          * the state_owner. we keep this around to process errors
3065          */
3066         switch (task->tk_status) {
3067                 case 0:
3068                         res_stateid = &calldata->res.stateid;
3069                         if (calldata->roc)
3070                                 pnfs_roc_set_barrier(state->inode,
3071                                                      calldata->roc_barrier);
3072                         renew_lease(server, calldata->timestamp);
3073                         break;
3074                 case -NFS4ERR_ADMIN_REVOKED:
3075                 case -NFS4ERR_STALE_STATEID:
3076                 case -NFS4ERR_EXPIRED:
3077                         nfs4_free_revoked_stateid(server,
3078                                         &calldata->arg.stateid,
3079                                         task->tk_msg.rpc_cred);
3080                 case -NFS4ERR_OLD_STATEID:
3081                 case -NFS4ERR_BAD_STATEID:
3082                         if (!nfs4_stateid_match(&calldata->arg.stateid,
3083                                                 &state->open_stateid)) {
3084                                 rpc_restart_call_prepare(task);
3085                                 goto out_release;
3086                         }
3087                         if (calldata->arg.fmode == 0)
3088                                 break;
3089                 default:
3090                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
3091                                 rpc_restart_call_prepare(task);
3092                                 goto out_release;
3093                         }
3094         }
3095         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3096                         res_stateid, calldata->arg.fmode);
3097 out_release:
3098         nfs_release_seqid(calldata->arg.seqid);
3099         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
3100         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3101 }
3102
3103 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3104 {
3105         struct nfs4_closedata *calldata = data;
3106         struct nfs4_state *state = calldata->state;
3107         struct inode *inode = calldata->inode;
3108         bool is_rdonly, is_wronly, is_rdwr;
3109         int call_close = 0;
3110
3111         dprintk("%s: begin!\n", __func__);
3112         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3113                 goto out_wait;
3114
3115         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3116         spin_lock(&state->owner->so_lock);
3117         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3118         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3119         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3120         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
3121         /* Calculate the change in open mode */
3122         calldata->arg.fmode = 0;
3123         if (state->n_rdwr == 0) {
3124                 if (state->n_rdonly == 0)
3125                         call_close |= is_rdonly;
3126                 else if (is_rdonly)
3127                         calldata->arg.fmode |= FMODE_READ;
3128                 if (state->n_wronly == 0)
3129                         call_close |= is_wronly;
3130                 else if (is_wronly)
3131                         calldata->arg.fmode |= FMODE_WRITE;
3132                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3133                         call_close |= is_rdwr;
3134         } else if (is_rdwr)
3135                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3136
3137         if (!nfs4_valid_open_stateid(state) ||
3138             test_bit(NFS_OPEN_STATE, &state->flags) == 0)
3139                 call_close = 0;
3140         spin_unlock(&state->owner->so_lock);
3141
3142         if (!call_close) {
3143                 /* Note: exit _without_ calling nfs4_close_done */
3144                 goto out_no_action;
3145         }
3146
3147         if (nfs4_wait_on_layoutreturn(inode, task)) {
3148                 nfs_release_seqid(calldata->arg.seqid);
3149                 goto out_wait;
3150         }
3151
3152         if (calldata->arg.fmode == 0)
3153                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3154         if (calldata->roc)
3155                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
3156
3157         calldata->arg.share_access =
3158                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3159                                 calldata->arg.fmode, 0);
3160
3161         nfs_fattr_init(calldata->res.fattr);
3162         calldata->timestamp = jiffies;
3163         if (nfs4_setup_sequence(NFS_SERVER(inode),
3164                                 &calldata->arg.seq_args,
3165                                 &calldata->res.seq_res,
3166                                 task) != 0)
3167                 nfs_release_seqid(calldata->arg.seqid);
3168         dprintk("%s: done!\n", __func__);
3169         return;
3170 out_no_action:
3171         task->tk_action = NULL;
3172 out_wait:
3173         nfs4_sequence_done(task, &calldata->res.seq_res);
3174 }
3175
3176 static const struct rpc_call_ops nfs4_close_ops = {
3177         .rpc_call_prepare = nfs4_close_prepare,
3178         .rpc_call_done = nfs4_close_done,
3179         .rpc_release = nfs4_free_closedata,
3180 };
3181
3182 static bool nfs4_roc(struct inode *inode)
3183 {
3184         if (!nfs_have_layout(inode))
3185                 return false;
3186         return pnfs_roc(inode);
3187 }
3188
3189 /*
3190  * It is possible for data to be read/written from a mem-mapped file
3191  * after the sys_close call (which hits the vfs layer as a flush).
3192  * This means that we can't safely call nfsv4 close on a file until
3193  * the inode is cleared. This in turn means that we are not good
3194  * NFSv4 citizens - we do not indicate to the server to update the file's
3195  * share state even when we are done with one of the three share
3196  * stateid's in the inode.
3197  *
3198  * NOTE: Caller must be holding the sp->so_owner semaphore!
3199  */
3200 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3201 {
3202         struct nfs_server *server = NFS_SERVER(state->inode);
3203         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3204         struct nfs4_closedata *calldata;
3205         struct nfs4_state_owner *sp = state->owner;
3206         struct rpc_task *task;
3207         struct rpc_message msg = {
3208                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3209                 .rpc_cred = state->owner->so_cred,
3210         };
3211         struct rpc_task_setup task_setup_data = {
3212                 .rpc_client = server->client,
3213                 .rpc_message = &msg,
3214                 .callback_ops = &nfs4_close_ops,
3215                 .workqueue = nfsiod_workqueue,
3216                 .flags = RPC_TASK_ASYNC,
3217         };
3218         int status = -ENOMEM;
3219
3220         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3221                 &task_setup_data.rpc_client, &msg);
3222
3223         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3224         if (calldata == NULL)
3225                 goto out;
3226         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
3227         calldata->inode = state->inode;
3228         calldata->state = state;
3229         calldata->arg.fh = NFS_FH(state->inode);
3230         /* Serialization for the sequence id */
3231         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3232         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3233         if (IS_ERR(calldata->arg.seqid))
3234                 goto out_free_calldata;
3235         calldata->arg.fmode = 0;
3236         calldata->arg.bitmask = server->cache_consistency_bitmask;
3237         calldata->res.fattr = &calldata->fattr;
3238         calldata->res.seqid = calldata->arg.seqid;
3239         calldata->res.server = server;
3240         calldata->roc = nfs4_roc(state->inode);
3241         nfs_sb_active(calldata->inode->i_sb);
3242
3243         msg.rpc_argp = &calldata->arg;
3244         msg.rpc_resp = &calldata->res;
3245         task_setup_data.callback_data = calldata;
3246         task = rpc_run_task(&task_setup_data);
3247         if (IS_ERR(task))
3248                 return PTR_ERR(task);
3249         status = 0;
3250         if (wait)
3251                 status = rpc_wait_for_completion_task(task);
3252         rpc_put_task(task);
3253         return status;
3254 out_free_calldata:
3255         kfree(calldata);
3256 out:
3257         nfs4_put_open_state(state);
3258         nfs4_put_state_owner(sp);
3259         return status;
3260 }
3261
3262 static struct inode *
3263 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3264                 int open_flags, struct iattr *attr, int *opened)
3265 {
3266         struct nfs4_state *state;
3267         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3268
3269         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3270
3271         /* Protect against concurrent sillydeletes */
3272         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3273
3274         nfs4_label_release_security(label);
3275
3276         if (IS_ERR(state))
3277                 return ERR_CAST(state);
3278         return state->inode;
3279 }
3280
3281 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3282 {
3283         if (ctx->state == NULL)
3284                 return;
3285         if (is_sync)
3286                 nfs4_close_sync(ctx->state, ctx->mode);
3287         else
3288                 nfs4_close_state(ctx->state, ctx->mode);
3289 }
3290
3291 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3292 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3293 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
3294
3295 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3296 {
3297         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3298         struct nfs4_server_caps_arg args = {
3299                 .fhandle = fhandle,
3300                 .bitmask = bitmask,
3301         };
3302         struct nfs4_server_caps_res res = {};
3303         struct rpc_message msg = {
3304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3305                 .rpc_argp = &args,
3306                 .rpc_resp = &res,
3307         };
3308         int status;
3309
3310         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3311                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3312                      FATTR4_WORD0_LINK_SUPPORT |
3313                      FATTR4_WORD0_SYMLINK_SUPPORT |
3314                      FATTR4_WORD0_ACLSUPPORT;
3315         if (minorversion)
3316                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3317
3318         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3319         if (status == 0) {
3320                 /* Sanity check the server answers */
3321                 switch (minorversion) {
3322                 case 0:
3323                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3324                         res.attr_bitmask[2] = 0;
3325                         break;
3326                 case 1:
3327                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3328                         break;
3329                 case 2:
3330                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3331                 }
3332                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3333                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3334                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3335                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3336                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3337                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3338                                 NFS_CAP_SECURITY_LABEL);
3339                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3340                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3341                         server->caps |= NFS_CAP_ACLS;
3342                 if (res.has_links != 0)
3343                         server->caps |= NFS_CAP_HARDLINKS;
3344                 if (res.has_symlinks != 0)
3345                         server->caps |= NFS_CAP_SYMLINKS;
3346                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3347                         server->caps |= NFS_CAP_FILEID;
3348                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3349                         server->caps |= NFS_CAP_MODE;
3350                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3351                         server->caps |= NFS_CAP_NLINK;
3352                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3353                         server->caps |= NFS_CAP_OWNER;
3354                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3355                         server->caps |= NFS_CAP_OWNER_GROUP;
3356                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3357                         server->caps |= NFS_CAP_ATIME;
3358                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3359                         server->caps |= NFS_CAP_CTIME;
3360                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3361                         server->caps |= NFS_CAP_MTIME;
3362 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3363                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3364                         server->caps |= NFS_CAP_SECURITY_LABEL;
3365 #endif
3366                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3367                                 sizeof(server->attr_bitmask));
3368                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3369
3370                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3371                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3372                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3373                 server->cache_consistency_bitmask[2] = 0;
3374                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3375                         sizeof(server->exclcreat_bitmask));
3376                 server->acl_bitmask = res.acl_bitmask;
3377                 server->fh_expire_type = res.fh_expire_type;
3378         }
3379
3380         return status;
3381 }
3382
3383 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3384 {
3385         struct nfs4_exception exception = { };
3386         int err;
3387         do {
3388                 err = nfs4_handle_exception(server,
3389                                 _nfs4_server_capabilities(server, fhandle),
3390                                 &exception);
3391         } while (exception.retry);
3392         return err;
3393 }
3394
3395 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3396                 struct nfs_fsinfo *info)
3397 {
3398         u32 bitmask[3];
3399         struct nfs4_lookup_root_arg args = {
3400                 .bitmask = bitmask,
3401         };
3402         struct nfs4_lookup_res res = {
3403                 .server = server,
3404                 .fattr = info->fattr,
3405                 .fh = fhandle,
3406         };
3407         struct rpc_message msg = {
3408                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3409                 .rpc_argp = &args,
3410                 .rpc_resp = &res,
3411         };
3412
3413         bitmask[0] = nfs4_fattr_bitmap[0];
3414         bitmask[1] = nfs4_fattr_bitmap[1];
3415         /*
3416          * Process the label in the upcoming getfattr
3417          */
3418         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3419
3420         nfs_fattr_init(info->fattr);
3421         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3422 }
3423
3424 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3425                 struct nfs_fsinfo *info)
3426 {
3427         struct nfs4_exception exception = { };
3428         int err;
3429         do {
3430                 err = _nfs4_lookup_root(server, fhandle, info);
3431                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3432                 switch (err) {
3433                 case 0:
3434                 case -NFS4ERR_WRONGSEC:
3435                         goto out;
3436                 default:
3437                         err = nfs4_handle_exception(server, err, &exception);
3438                 }
3439         } while (exception.retry);
3440 out:
3441         return err;
3442 }
3443
3444 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3445                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3446 {
3447         struct rpc_auth_create_args auth_args = {
3448                 .pseudoflavor = flavor,
3449         };
3450         struct rpc_auth *auth;
3451         int ret;
3452
3453         auth = rpcauth_create(&auth_args, server->client);
3454         if (IS_ERR(auth)) {
3455                 ret = -EACCES;
3456                 goto out;
3457         }
3458         ret = nfs4_lookup_root(server, fhandle, info);
3459 out:
3460         return ret;
3461 }
3462
3463 /*
3464  * Retry pseudoroot lookup with various security flavors.  We do this when:
3465  *
3466  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3467  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3468  *
3469  * Returns zero on success, or a negative NFS4ERR value, or a
3470  * negative errno value.
3471  */
3472 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3473                               struct nfs_fsinfo *info)
3474 {
3475         /* Per 3530bis 15.33.5 */
3476         static const rpc_authflavor_t flav_array[] = {
3477                 RPC_AUTH_GSS_KRB5P,
3478                 RPC_AUTH_GSS_KRB5I,
3479                 RPC_AUTH_GSS_KRB5,
3480                 RPC_AUTH_UNIX,                  /* courtesy */
3481                 RPC_AUTH_NULL,
3482         };
3483         int status = -EPERM;
3484         size_t i;
3485
3486         if (server->auth_info.flavor_len > 0) {
3487                 /* try each flavor specified by user */
3488                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3489                         status = nfs4_lookup_root_sec(server, fhandle, info,
3490                                                 server->auth_info.flavors[i]);
3491                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3492                                 continue;
3493                         break;
3494                 }
3495         } else {
3496                 /* no flavors specified by user, try default list */
3497                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3498                         status = nfs4_lookup_root_sec(server, fhandle, info,
3499                                                       flav_array[i]);
3500                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3501                                 continue;
3502                         break;
3503                 }
3504         }
3505
3506         /*
3507          * -EACCESS could mean that the user doesn't have correct permissions
3508          * to access the mount.  It could also mean that we tried to mount
3509          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3510          * existing mount programs don't handle -EACCES very well so it should
3511          * be mapped to -EPERM instead.
3512          */
3513         if (status == -EACCES)
3514                 status = -EPERM;
3515         return status;
3516 }
3517
3518 /**
3519  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3520  * @server: initialized nfs_server handle
3521  * @fhandle: we fill in the pseudo-fs root file handle
3522  * @info: we fill in an FSINFO struct
3523  * @auth_probe: probe the auth flavours
3524  *
3525  * Returns zero on success, or a negative errno.
3526  */
3527 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3528                          struct nfs_fsinfo *info,
3529                          bool auth_probe)
3530 {
3531         int status = 0;
3532
3533         if (!auth_probe)
3534                 status = nfs4_lookup_root(server, fhandle, info);
3535
3536         if (auth_probe || status == NFS4ERR_WRONGSEC)
3537                 status = server->nfs_client->cl_mvops->find_root_sec(server,
3538                                 fhandle, info);
3539
3540         if (status == 0)
3541                 status = nfs4_server_capabilities(server, fhandle);
3542         if (status == 0)
3543                 status = nfs4_do_fsinfo(server, fhandle, info);
3544
3545         return nfs4_map_errors(status);
3546 }
3547
3548 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3549                               struct nfs_fsinfo *info)
3550 {
3551         int error;
3552         struct nfs_fattr *fattr = info->fattr;
3553         struct nfs4_label *label = NULL;
3554
3555         error = nfs4_server_capabilities(server, mntfh);
3556         if (error < 0) {
3557                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3558                 return error;
3559         }
3560
3561         label = nfs4_label_alloc(server, GFP_KERNEL);
3562         if (IS_ERR(label))
3563                 return PTR_ERR(label);
3564
3565         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3566         if (error < 0) {
3567                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3568                 goto err_free_label;
3569         }
3570
3571         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3572             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3573                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3574
3575 err_free_label:
3576         nfs4_label_free(label);
3577
3578         return error;
3579 }
3580
3581 /*
3582  * Get locations and (maybe) other attributes of a referral.
3583  * Note that we'll actually follow the referral later when
3584  * we detect fsid mismatch in inode revalidation
3585  */
3586 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3587                              const struct qstr *name, struct nfs_fattr *fattr,
3588                              struct nfs_fh *fhandle)
3589 {
3590         int status = -ENOMEM;
3591         struct page *page = NULL;
3592         struct nfs4_fs_locations *locations = NULL;
3593
3594         page = alloc_page(GFP_KERNEL);
3595         if (page == NULL)
3596                 goto out;
3597         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3598         if (locations == NULL)
3599                 goto out;
3600
3601         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3602         if (status != 0)
3603                 goto out;
3604
3605         /*
3606          * If the fsid didn't change, this is a migration event, not a
3607          * referral.  Cause us to drop into the exception handler, which
3608          * will kick off migration recovery.
3609          */
3610         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3611                 dprintk("%s: server did not return a different fsid for"
3612                         " a referral at %s\n", __func__, name->name);
3613                 status = -NFS4ERR_MOVED;
3614                 goto out;
3615         }
3616         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3617         nfs_fixup_referral_attributes(&locations->fattr);
3618
3619         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3620         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3621         memset(fhandle, 0, sizeof(struct nfs_fh));
3622 out:
3623         if (page)
3624                 __free_page(page);
3625         kfree(locations);
3626         return status;
3627 }
3628
3629 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3630                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3631 {
3632         struct nfs4_getattr_arg args = {
3633                 .fh = fhandle,
3634                 .bitmask = server->attr_bitmask,
3635         };
3636         struct nfs4_getattr_res res = {
3637                 .fattr = fattr,
3638                 .label = label,
3639                 .server = server,
3640         };
3641         struct rpc_message msg = {
3642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3643                 .rpc_argp = &args,
3644                 .rpc_resp = &res,
3645         };
3646
3647         args.bitmask = nfs4_bitmask(server, label);
3648
3649         nfs_fattr_init(fattr);
3650         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3651 }
3652
3653 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3654                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3655 {
3656         struct nfs4_exception exception = { };
3657         int err;
3658         do {
3659                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3660                 trace_nfs4_getattr(server, fhandle, fattr, err);
3661                 err = nfs4_handle_exception(server, err,
3662                                 &exception);
3663         } while (exception.retry);
3664         return err;
3665 }
3666
3667 /*
3668  * The file is not closed if it is opened due to the a request to change
3669  * the size of the file. The open call will not be needed once the
3670  * VFS layer lookup-intents are implemented.
3671  *
3672  * Close is called when the inode is destroyed.
3673  * If we haven't opened the file for O_WRONLY, we
3674  * need to in the size_change case to obtain a stateid.
3675  *
3676  * Got race?
3677  * Because OPEN is always done by name in nfsv4, it is
3678  * possible that we opened a different file by the same
3679  * name.  We can recognize this race condition, but we
3680  * can't do anything about it besides returning an error.
3681  *
3682  * This will be fixed with VFS changes (lookup-intent).
3683  */
3684 static int
3685 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3686                   struct iattr *sattr)
3687 {
3688         struct inode *inode = d_inode(dentry);
3689         struct rpc_cred *cred = NULL;
3690         struct nfs4_state *state = NULL;
3691         struct nfs4_label *label = NULL;
3692         int status;
3693
3694         if (pnfs_ld_layoutret_on_setattr(inode) &&
3695             sattr->ia_valid & ATTR_SIZE &&
3696             sattr->ia_size < i_size_read(inode))
3697                 pnfs_commit_and_return_layout(inode);
3698
3699         nfs_fattr_init(fattr);
3700
3701         /* Deal with open(O_TRUNC) */
3702         if (sattr->ia_valid & ATTR_OPEN)
3703                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3704
3705         /* Optimization: if the end result is no change, don't RPC */
3706         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3707                 return 0;
3708
3709         /* Search for an existing open(O_WRITE) file */
3710         if (sattr->ia_valid & ATTR_FILE) {
3711                 struct nfs_open_context *ctx;
3712
3713                 ctx = nfs_file_open_context(sattr->ia_file);
3714                 if (ctx) {
3715                         cred = ctx->cred;
3716                         state = ctx->state;
3717                 }
3718         }
3719
3720         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3721         if (IS_ERR(label))
3722                 return PTR_ERR(label);
3723
3724         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3725         if (status == 0) {
3726                 nfs_setattr_update_inode(inode, sattr, fattr);
3727                 nfs_setsecurity(inode, fattr, label);
3728         }
3729         nfs4_label_free(label);
3730         return status;
3731 }
3732
3733 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3734                 const struct qstr *name, struct nfs_fh *fhandle,
3735                 struct nfs_fattr *fattr, struct nfs4_label *label)
3736 {
3737         struct nfs_server *server = NFS_SERVER(dir);
3738         int                    status;
3739         struct nfs4_lookup_arg args = {
3740                 .bitmask = server->attr_bitmask,
3741                 .dir_fh = NFS_FH(dir),
3742                 .name = name,
3743         };
3744         struct nfs4_lookup_res res = {
3745                 .server = server,
3746                 .fattr = fattr,
3747                 .label = label,
3748                 .fh = fhandle,
3749         };
3750         struct rpc_message msg = {
3751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3752                 .rpc_argp = &args,
3753                 .rpc_resp = &res,
3754         };
3755
3756         args.bitmask = nfs4_bitmask(server, label);
3757
3758         nfs_fattr_init(fattr);
3759
3760         dprintk("NFS call  lookup %s\n", name->name);
3761         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3762         dprintk("NFS reply lookup: %d\n", status);
3763         return status;
3764 }
3765
3766 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3767 {
3768         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3769                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3770         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3771         fattr->nlink = 2;
3772 }
3773
3774 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3775                                    const struct qstr *name, struct nfs_fh *fhandle,
3776                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3777 {
3778         struct nfs4_exception exception = { };
3779         struct rpc_clnt *client = *clnt;
3780         int err;
3781         do {
3782                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3783                 trace_nfs4_lookup(dir, name, err);
3784                 switch (err) {
3785                 case -NFS4ERR_BADNAME:
3786                         err = -ENOENT;
3787                         goto out;
3788                 case -NFS4ERR_MOVED:
3789                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3790                         if (err == -NFS4ERR_MOVED)
3791                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3792                         goto out;
3793                 case -NFS4ERR_WRONGSEC:
3794                         err = -EPERM;
3795                         if (client != *clnt)
3796                                 goto out;
3797                         client = nfs4_negotiate_security(client, dir, name);
3798                         if (IS_ERR(client))
3799                                 return PTR_ERR(client);
3800
3801                         exception.retry = 1;
3802                         break;
3803                 default:
3804                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3805                 }
3806         } while (exception.retry);
3807
3808 out:
3809         if (err == 0)
3810                 *clnt = client;
3811         else if (client != *clnt)
3812                 rpc_shutdown_client(client);
3813
3814         return err;
3815 }
3816
3817 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
3818                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3819                             struct nfs4_label *label)
3820 {
3821         int status;
3822         struct rpc_clnt *client = NFS_CLIENT(dir);
3823
3824         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3825         if (client != NFS_CLIENT(dir)) {
3826                 rpc_shutdown_client(client);
3827                 nfs_fixup_secinfo_attributes(fattr);
3828         }
3829         return status;
3830 }
3831
3832 struct rpc_clnt *
3833 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name,
3834                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3835 {
3836         struct rpc_clnt *client = NFS_CLIENT(dir);
3837         int status;
3838
3839         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3840         if (status < 0)
3841                 return ERR_PTR(status);
3842         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3843 }
3844
3845 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3846 {
3847         struct nfs_server *server = NFS_SERVER(inode);
3848         struct nfs4_accessargs args = {
3849                 .fh = NFS_FH(inode),
3850                 .bitmask = server->cache_consistency_bitmask,
3851         };
3852         struct nfs4_accessres res = {
3853                 .server = server,
3854         };
3855         struct rpc_message msg = {
3856                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3857                 .rpc_argp = &args,
3858                 .rpc_resp = &res,
3859                 .rpc_cred = entry->cred,
3860         };
3861         int mode = entry->mask;
3862         int status = 0;
3863
3864         /*
3865          * Determine which access bits we want to ask for...
3866          */
3867         if (mode & MAY_READ)
3868                 args.access |= NFS4_ACCESS_READ;
3869         if (S_ISDIR(inode->i_mode)) {
3870                 if (mode & MAY_WRITE)
3871                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3872                 if (mode & MAY_EXEC)
3873                         args.access |= NFS4_ACCESS_LOOKUP;
3874         } else {
3875                 if (mode & MAY_WRITE)
3876                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3877                 if (mode & MAY_EXEC)
3878                         args.access |= NFS4_ACCESS_EXECUTE;
3879         }
3880
3881         res.fattr = nfs_alloc_fattr();
3882         if (res.fattr == NULL)
3883                 return -ENOMEM;
3884
3885         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3886         if (!status) {
3887                 nfs_access_set_mask(entry, res.access);
3888                 nfs_refresh_inode(inode, res.fattr);
3889         }
3890         nfs_free_fattr(res.fattr);
3891         return status;
3892 }
3893
3894 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3895 {
3896         struct nfs4_exception exception = { };
3897         int err;
3898         do {
3899                 err = _nfs4_proc_access(inode, entry);
3900                 trace_nfs4_access(inode, err);
3901                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3902                                 &exception);
3903         } while (exception.retry);
3904         return err;
3905 }
3906
3907 /*
3908  * TODO: For the time being, we don't try to get any attributes
3909  * along with any of the zero-copy operations READ, READDIR,
3910  * READLINK, WRITE.
3911  *
3912  * In the case of the first three, we want to put the GETATTR
3913  * after the read-type operation -- this is because it is hard
3914  * to predict the length of a GETATTR response in v4, and thus
3915  * align the READ data correctly.  This means that the GETATTR
3916  * may end up partially falling into the page cache, and we should
3917  * shift it into the 'tail' of the xdr_buf before processing.
3918  * To do this efficiently, we need to know the total length
3919  * of data received, which doesn't seem to be available outside
3920  * of the RPC layer.
3921  *
3922  * In the case of WRITE, we also want to put the GETATTR after
3923  * the operation -- in this case because we want to make sure
3924  * we get the post-operation mtime and size.
3925  *
3926  * Both of these changes to the XDR layer would in fact be quite
3927  * minor, but I decided to leave them for a subsequent patch.
3928  */
3929 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3930                 unsigned int pgbase, unsigned int pglen)
3931 {
3932         struct nfs4_readlink args = {
3933                 .fh       = NFS_FH(inode),
3934                 .pgbase   = pgbase,
3935                 .pglen    = pglen,
3936                 .pages    = &page,
3937         };
3938         struct nfs4_readlink_res res;
3939         struct rpc_message msg = {
3940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3941                 .rpc_argp = &args,
3942                 .rpc_resp = &res,
3943         };
3944
3945         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3946 }
3947
3948 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3949                 unsigned int pgbase, unsigned int pglen)
3950 {
3951         struct nfs4_exception exception = { };
3952         int err;
3953         do {
3954                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3955                 trace_nfs4_readlink(inode, err);
3956                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3957                                 &exception);
3958         } while (exception.retry);
3959         return err;
3960 }
3961
3962 /*
3963  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3964  */
3965 static int
3966 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3967                  int flags)
3968 {
3969         struct nfs4_label l, *ilabel = NULL;
3970         struct nfs_open_context *ctx;
3971         struct nfs4_state *state;
3972         int status = 0;
3973
3974         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3975         if (IS_ERR(ctx))
3976                 return PTR_ERR(ctx);
3977
3978         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3979
3980         sattr->ia_mode &= ~current_umask();
3981         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3982         if (IS_ERR(state)) {
3983                 status = PTR_ERR(state);
3984                 goto out;
3985         }
3986 out:
3987         nfs4_label_release_security(ilabel);
3988         put_nfs_open_context(ctx);
3989         return status;
3990 }
3991
3992 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name)
3993 {
3994         struct nfs_server *server = NFS_SERVER(dir);
3995         struct nfs_removeargs args = {
3996                 .fh = NFS_FH(dir),
3997                 .name = *name,
3998         };
3999         struct nfs_removeres res = {
4000                 .server = server,
4001         };
4002         struct rpc_message msg = {
4003                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4004                 .rpc_argp = &args,
4005                 .rpc_resp = &res,
4006         };
4007         int status;
4008
4009         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4010         if (status == 0)
4011                 update_changeattr(dir, &res.cinfo);
4012         return status;
4013 }
4014
4015 static int nfs4_proc_remove(struct inode *dir, const struct qstr *name)
4016 {
4017         struct nfs4_exception exception = { };
4018         int err;
4019         do {
4020                 err = _nfs4_proc_remove(dir, name);
4021                 trace_nfs4_remove(dir, name, err);
4022                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4023                                 &exception);
4024         } while (exception.retry);
4025         return err;
4026 }
4027
4028 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
4029 {
4030         struct nfs_server *server = NFS_SERVER(dir);
4031         struct nfs_removeargs *args = msg->rpc_argp;
4032         struct nfs_removeres *res = msg->rpc_resp;
4033
4034         res->server = server;
4035         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4036         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
4037
4038         nfs_fattr_init(res->dir_attr);
4039 }
4040
4041 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4042 {
4043         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb),
4044                         &data->args.seq_args,
4045                         &data->res.seq_res,
4046                         task);
4047 }
4048
4049 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4050 {
4051         struct nfs_unlinkdata *data = task->tk_calldata;
4052         struct nfs_removeres *res = &data->res;
4053
4054         if (!nfs4_sequence_done(task, &res->seq_res))
4055                 return 0;
4056         if (nfs4_async_handle_error(task, res->server, NULL,
4057                                     &data->timeout) == -EAGAIN)
4058                 return 0;
4059         update_changeattr(dir, &res->cinfo);
4060         return 1;
4061 }
4062
4063 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
4064 {
4065         struct nfs_server *server = NFS_SERVER(dir);
4066         struct nfs_renameargs *arg = msg->rpc_argp;
4067         struct nfs_renameres *res = msg->rpc_resp;
4068
4069         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4070         res->server = server;
4071         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
4072 }
4073
4074 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4075 {
4076         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
4077                         &data->args.seq_args,
4078                         &data->res.seq_res,
4079                         task);
4080 }
4081
4082 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4083                                  struct inode *new_dir)
4084 {
4085         struct nfs_renamedata *data = task->tk_calldata;
4086         struct nfs_renameres *res = &data->res;
4087
4088         if (!nfs4_sequence_done(task, &res->seq_res))
4089                 return 0;
4090         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4091                 return 0;
4092
4093         update_changeattr(old_dir, &res->old_cinfo);
4094         update_changeattr(new_dir, &res->new_cinfo);
4095         return 1;
4096 }
4097
4098 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4099 {
4100         struct nfs_server *server = NFS_SERVER(inode);
4101         struct nfs4_link_arg arg = {
4102                 .fh     = NFS_FH(inode),
4103                 .dir_fh = NFS_FH(dir),
4104                 .name   = name,
4105                 .bitmask = server->attr_bitmask,
4106         };
4107         struct nfs4_link_res res = {
4108                 .server = server,
4109                 .label = NULL,
4110         };
4111         struct rpc_message msg = {
4112                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4113                 .rpc_argp = &arg,
4114                 .rpc_resp = &res,
4115         };
4116         int status = -ENOMEM;
4117
4118         res.fattr = nfs_alloc_fattr();
4119         if (res.fattr == NULL)
4120                 goto out;
4121
4122         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4123         if (IS_ERR(res.label)) {
4124                 status = PTR_ERR(res.label);
4125                 goto out;
4126         }
4127         arg.bitmask = nfs4_bitmask(server, res.label);
4128
4129         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4130         if (!status) {
4131                 update_changeattr(dir, &res.cinfo);
4132                 status = nfs_post_op_update_inode(inode, res.fattr);
4133                 if (!status)
4134                         nfs_setsecurity(inode, res.fattr, res.label);
4135         }
4136
4137
4138         nfs4_label_free(res.label);
4139
4140 out:
4141         nfs_free_fattr(res.fattr);
4142         return status;
4143 }
4144
4145 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4146 {
4147         struct nfs4_exception exception = { };
4148         int err;
4149         do {
4150                 err = nfs4_handle_exception(NFS_SERVER(inode),
4151                                 _nfs4_proc_link(inode, dir, name),
4152                                 &exception);
4153         } while (exception.retry);
4154         return err;
4155 }
4156
4157 struct nfs4_createdata {
4158         struct rpc_message msg;
4159         struct nfs4_create_arg arg;
4160         struct nfs4_create_res res;
4161         struct nfs_fh fh;
4162         struct nfs_fattr fattr;
4163         struct nfs4_label *label;
4164 };
4165
4166 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4167                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4168 {
4169         struct nfs4_createdata *data;
4170
4171         data = kzalloc(sizeof(*data), GFP_KERNEL);
4172         if (data != NULL) {
4173                 struct nfs_server *server = NFS_SERVER(dir);
4174
4175                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4176                 if (IS_ERR(data->label))
4177                         goto out_free;
4178
4179                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4180                 data->msg.rpc_argp = &data->arg;
4181                 data->msg.rpc_resp = &data->res;
4182                 data->arg.dir_fh = NFS_FH(dir);
4183                 data->arg.server = server;
4184                 data->arg.name = name;
4185                 data->arg.attrs = sattr;
4186                 data->arg.ftype = ftype;
4187                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4188                 data->res.server = server;
4189                 data->res.fh = &data->fh;
4190                 data->res.fattr = &data->fattr;
4191                 data->res.label = data->label;
4192                 nfs_fattr_init(data->res.fattr);
4193         }
4194         return data;
4195 out_free:
4196         kfree(data);
4197         return NULL;
4198 }
4199
4200 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4201 {
4202         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4203                                     &data->arg.seq_args, &data->res.seq_res, 1);
4204         if (status == 0) {
4205                 update_changeattr(dir, &data->res.dir_cinfo);
4206                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4207         }
4208         return status;
4209 }
4210
4211 static void nfs4_free_createdata(struct nfs4_createdata *data)
4212 {
4213         nfs4_label_free(data->label);
4214         kfree(data);
4215 }
4216
4217 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4218                 struct page *page, unsigned int len, struct iattr *sattr,
4219                 struct nfs4_label *label)
4220 {
4221         struct nfs4_createdata *data;
4222         int status = -ENAMETOOLONG;
4223
4224         if (len > NFS4_MAXPATHLEN)
4225                 goto out;
4226
4227         status = -ENOMEM;
4228         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4229         if (data == NULL)
4230                 goto out;
4231
4232         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4233         data->arg.u.symlink.pages = &page;
4234         data->arg.u.symlink.len = len;
4235         data->arg.label = label;
4236
4237         status = nfs4_do_create(dir, dentry, data);
4238
4239         nfs4_free_createdata(data);
4240 out:
4241         return status;
4242 }
4243
4244 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4245                 struct page *page, unsigned int len, struct iattr *sattr)
4246 {
4247         struct nfs4_exception exception = { };
4248         struct nfs4_label l, *label = NULL;
4249         int err;
4250
4251         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4252
4253         do {
4254                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4255                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4256                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4257                                 &exception);
4258         } while (exception.retry);
4259
4260         nfs4_label_release_security(label);
4261         return err;
4262 }
4263
4264 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4265                 struct iattr *sattr, struct nfs4_label *label)
4266 {
4267         struct nfs4_createdata *data;
4268         int status = -ENOMEM;
4269
4270         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4271         if (data == NULL)
4272                 goto out;
4273
4274         data->arg.label = label;
4275         status = nfs4_do_create(dir, dentry, data);
4276
4277         nfs4_free_createdata(data);
4278 out:
4279         return status;
4280 }
4281
4282 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4283                 struct iattr *sattr)
4284 {
4285         struct nfs4_exception exception = { };
4286         struct nfs4_label l, *label = NULL;
4287         int err;
4288
4289         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4290
4291         sattr->ia_mode &= ~current_umask();
4292         do {
4293                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4294                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4295                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4296                                 &exception);
4297         } while (exception.retry);
4298         nfs4_label_release_security(label);
4299
4300         return err;
4301 }
4302
4303 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4304                 u64 cookie, struct page **pages, unsigned int count, int plus)
4305 {
4306         struct inode            *dir = d_inode(dentry);
4307         struct nfs4_readdir_arg args = {
4308                 .fh = NFS_FH(dir),
4309                 .pages = pages,
4310                 .pgbase = 0,
4311                 .count = count,
4312                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4313                 .plus = plus,
4314         };
4315         struct nfs4_readdir_res res;
4316         struct rpc_message msg = {
4317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4318                 .rpc_argp = &args,
4319                 .rpc_resp = &res,
4320                 .rpc_cred = cred,
4321         };
4322         int                     status;
4323
4324         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4325                         dentry,
4326                         (unsigned long long)cookie);
4327         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4328         res.pgbase = args.pgbase;
4329         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4330         if (status >= 0) {
4331                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4332                 status += args.pgbase;
4333         }
4334
4335         nfs_invalidate_atime(dir);
4336
4337         dprintk("%s: returns %d\n", __func__, status);
4338         return status;
4339 }
4340
4341 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4342                 u64 cookie, struct page **pages, unsigned int count, int plus)
4343 {
4344         struct nfs4_exception exception = { };
4345         int err;
4346         do {
4347                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4348                                 pages, count, plus);
4349                 trace_nfs4_readdir(d_inode(dentry), err);
4350                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4351                                 &exception);
4352         } while (exception.retry);
4353         return err;
4354 }
4355
4356 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4357                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4358 {
4359         struct nfs4_createdata *data;
4360         int mode = sattr->ia_mode;
4361         int status = -ENOMEM;
4362
4363         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4364         if (data == NULL)
4365                 goto out;
4366
4367         if (S_ISFIFO(mode))
4368                 data->arg.ftype = NF4FIFO;
4369         else if (S_ISBLK(mode)) {
4370                 data->arg.ftype = NF4BLK;
4371                 data->arg.u.device.specdata1 = MAJOR(rdev);
4372                 data->arg.u.device.specdata2 = MINOR(rdev);
4373         }
4374         else if (S_ISCHR(mode)) {
4375                 data->arg.ftype = NF4CHR;
4376                 data->arg.u.device.specdata1 = MAJOR(rdev);
4377                 data->arg.u.device.specdata2 = MINOR(rdev);
4378         } else if (!S_ISSOCK(mode)) {
4379                 status = -EINVAL;
4380                 goto out_free;
4381         }
4382
4383         data->arg.label = label;
4384         status = nfs4_do_create(dir, dentry, data);
4385 out_free:
4386         nfs4_free_createdata(data);
4387 out:
4388         return status;
4389 }
4390
4391 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4392                 struct iattr *sattr, dev_t rdev)
4393 {
4394         struct nfs4_exception exception = { };
4395         struct nfs4_label l, *label = NULL;
4396         int err;
4397
4398         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4399
4400         sattr->ia_mode &= ~current_umask();
4401         do {
4402                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4403                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4404                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4405                                 &exception);
4406         } while (exception.retry);
4407
4408         nfs4_label_release_security(label);
4409
4410         return err;
4411 }
4412
4413 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4414                  struct nfs_fsstat *fsstat)
4415 {
4416         struct nfs4_statfs_arg args = {
4417                 .fh = fhandle,
4418                 .bitmask = server->attr_bitmask,
4419         };
4420         struct nfs4_statfs_res res = {
4421                 .fsstat = fsstat,
4422         };
4423         struct rpc_message msg = {
4424                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4425                 .rpc_argp = &args,
4426                 .rpc_resp = &res,
4427         };
4428
4429         nfs_fattr_init(fsstat->fattr);
4430         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4431 }
4432
4433 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4434 {
4435         struct nfs4_exception exception = { };
4436         int err;
4437         do {
4438                 err = nfs4_handle_exception(server,
4439                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4440                                 &exception);
4441         } while (exception.retry);
4442         return err;
4443 }
4444
4445 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4446                 struct nfs_fsinfo *fsinfo)
4447 {
4448         struct nfs4_fsinfo_arg args = {
4449                 .fh = fhandle,
4450                 .bitmask = server->attr_bitmask,
4451         };
4452         struct nfs4_fsinfo_res res = {
4453                 .fsinfo = fsinfo,
4454         };
4455         struct rpc_message msg = {
4456                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4457                 .rpc_argp = &args,
4458                 .rpc_resp = &res,
4459         };
4460
4461         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4462 }
4463
4464 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4465 {
4466         struct nfs4_exception exception = { };
4467         unsigned long now = jiffies;
4468         int err;
4469
4470         do {
4471                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4472                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4473                 if (err == 0) {
4474                         nfs4_set_lease_period(server->nfs_client,
4475                                         fsinfo->lease_time * HZ,
4476                                         now);
4477                         break;
4478                 }
4479                 err = nfs4_handle_exception(server, err, &exception);
4480         } while (exception.retry);
4481         return err;
4482 }
4483
4484 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4485 {
4486         int error;
4487
4488         nfs_fattr_init(fsinfo->fattr);
4489         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4490         if (error == 0) {
4491                 /* block layout checks this! */
4492                 server->pnfs_blksize = fsinfo->blksize;
4493                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
4494         }
4495
4496         return error;
4497 }
4498
4499 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4500                 struct nfs_pathconf *pathconf)
4501 {
4502         struct nfs4_pathconf_arg args = {
4503                 .fh = fhandle,
4504                 .bitmask = server->attr_bitmask,
4505         };
4506         struct nfs4_pathconf_res res = {
4507                 .pathconf = pathconf,
4508         };
4509         struct rpc_message msg = {
4510                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4511                 .rpc_argp = &args,
4512                 .rpc_resp = &res,
4513         };
4514
4515         /* None of the pathconf attributes are mandatory to implement */
4516         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4517                 memset(pathconf, 0, sizeof(*pathconf));
4518                 return 0;
4519         }
4520
4521         nfs_fattr_init(pathconf->fattr);
4522         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4523 }
4524
4525 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4526                 struct nfs_pathconf *pathconf)
4527 {
4528         struct nfs4_exception exception = { };
4529         int err;
4530
4531         do {
4532                 err = nfs4_handle_exception(server,
4533                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4534                                 &exception);
4535         } while (exception.retry);
4536         return err;
4537 }
4538
4539 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4540                 const struct nfs_open_context *ctx,
4541                 const struct nfs_lock_context *l_ctx,
4542                 fmode_t fmode)
4543 {
4544         const struct nfs_lockowner *lockowner = NULL;
4545
4546         if (l_ctx != NULL)
4547                 lockowner = &l_ctx->lockowner;
4548         return nfs4_select_rw_stateid(ctx->state, fmode, lockowner, stateid, NULL);
4549 }
4550 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4551
4552 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4553                 const struct nfs_open_context *ctx,
4554                 const struct nfs_lock_context *l_ctx,
4555                 fmode_t fmode)
4556 {
4557         nfs4_stateid current_stateid;
4558
4559         /* If the current stateid represents a lost lock, then exit */
4560         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4561                 return true;
4562         return nfs4_stateid_match(stateid, &current_stateid);
4563 }
4564
4565 static bool nfs4_error_stateid_expired(int err)
4566 {
4567         switch (err) {
4568         case -NFS4ERR_DELEG_REVOKED:
4569         case -NFS4ERR_ADMIN_REVOKED:
4570         case -NFS4ERR_BAD_STATEID:
4571         case -NFS4ERR_STALE_STATEID:
4572         case -NFS4ERR_OLD_STATEID:
4573         case -NFS4ERR_OPENMODE:
4574         case -NFS4ERR_EXPIRED:
4575                 return true;
4576         }
4577         return false;
4578 }
4579
4580 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4581 {
4582         struct nfs_server *server = NFS_SERVER(hdr->inode);
4583
4584         trace_nfs4_read(hdr, task->tk_status);
4585         if (task->tk_status < 0) {
4586                 struct nfs4_exception exception = {
4587                         .inode = hdr->inode,
4588                         .state = hdr->args.context->state,
4589                         .stateid = &hdr->args.stateid,
4590                 };
4591                 task->tk_status = nfs4_async_handle_exception(task,
4592                                 server, task->tk_status, &exception);
4593                 if (exception.retry) {
4594                         rpc_restart_call_prepare(task);
4595                         return -EAGAIN;
4596                 }
4597         }
4598
4599         if (task->tk_status > 0)
4600                 renew_lease(server, hdr->timestamp);
4601         return 0;
4602 }
4603
4604 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4605                 struct nfs_pgio_args *args)
4606 {
4607
4608         if (!nfs4_error_stateid_expired(task->tk_status) ||
4609                 nfs4_stateid_is_current(&args->stateid,
4610                                 args->context,
4611                                 args->lock_context,
4612                                 FMODE_READ))
4613                 return false;
4614         rpc_restart_call_prepare(task);
4615         return true;
4616 }
4617
4618 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4619 {
4620
4621         dprintk("--> %s\n", __func__);
4622
4623         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4624                 return -EAGAIN;
4625         if (nfs4_read_stateid_changed(task, &hdr->args))
4626                 return -EAGAIN;
4627         if (task->tk_status > 0)
4628                 nfs_invalidate_atime(hdr->inode);
4629         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4630                                     nfs4_read_done_cb(task, hdr);
4631 }
4632
4633 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4634                                  struct rpc_message *msg)
4635 {
4636         hdr->timestamp   = jiffies;
4637         if (!hdr->pgio_done_cb)
4638                 hdr->pgio_done_cb = nfs4_read_done_cb;
4639         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4640         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4641 }
4642
4643 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4644                                       struct nfs_pgio_header *hdr)
4645 {
4646         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4647                         &hdr->args.seq_args,
4648                         &hdr->res.seq_res,
4649                         task))
4650                 return 0;
4651         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4652                                 hdr->args.lock_context,
4653                                 hdr->rw_ops->rw_mode) == -EIO)
4654                 return -EIO;
4655         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4656                 return -EIO;
4657         return 0;
4658 }
4659
4660 static int nfs4_write_done_cb(struct rpc_task *task,
4661                               struct nfs_pgio_header *hdr)
4662 {
4663         struct inode *inode = hdr->inode;
4664
4665         trace_nfs4_write(hdr, task->tk_status);
4666         if (task->tk_status < 0) {
4667                 struct nfs4_exception exception = {
4668                         .inode = hdr->inode,
4669                         .state = hdr->args.context->state,
4670                         .stateid = &hdr->args.stateid,
4671                 };
4672                 task->tk_status = nfs4_async_handle_exception(task,
4673                                 NFS_SERVER(inode), task->tk_status,
4674                                 &exception);
4675                 if (exception.retry) {
4676                         rpc_restart_call_prepare(task);
4677                         return -EAGAIN;
4678                 }
4679         }
4680         if (task->tk_status >= 0) {
4681                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4682                 nfs_writeback_update_inode(hdr);
4683         }
4684         return 0;
4685 }
4686
4687 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4688                 struct nfs_pgio_args *args)
4689 {
4690
4691         if (!nfs4_error_stateid_expired(task->tk_status) ||
4692                 nfs4_stateid_is_current(&args->stateid,
4693                                 args->context,
4694                                 args->lock_context,
4695                                 FMODE_WRITE))
4696                 return false;
4697         rpc_restart_call_prepare(task);
4698         return true;
4699 }
4700
4701 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4702 {
4703         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4704                 return -EAGAIN;
4705         if (nfs4_write_stateid_changed(task, &hdr->args))
4706                 return -EAGAIN;
4707         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4708                 nfs4_write_done_cb(task, hdr);
4709 }
4710
4711 static
4712 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4713 {
4714         /* Don't request attributes for pNFS or O_DIRECT writes */
4715         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4716                 return false;
4717         /* Otherwise, request attributes if and only if we don't hold
4718          * a delegation
4719          */
4720         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4721 }
4722
4723 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4724                                   struct rpc_message *msg)
4725 {
4726         struct nfs_server *server = NFS_SERVER(hdr->inode);
4727
4728         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4729                 hdr->args.bitmask = NULL;
4730                 hdr->res.fattr = NULL;
4731         } else
4732                 hdr->args.bitmask = server->cache_consistency_bitmask;
4733
4734         if (!hdr->pgio_done_cb)
4735                 hdr->pgio_done_cb = nfs4_write_done_cb;
4736         hdr->res.server = server;
4737         hdr->timestamp   = jiffies;
4738
4739         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4740         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4741 }
4742
4743 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4744 {
4745         nfs4_setup_sequence(NFS_SERVER(data->inode),
4746                         &data->args.seq_args,
4747                         &data->res.seq_res,
4748                         task);
4749 }
4750
4751 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4752 {
4753         struct inode *inode = data->inode;
4754
4755         trace_nfs4_commit(data, task->tk_status);
4756         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4757                                     NULL, NULL) == -EAGAIN) {
4758                 rpc_restart_call_prepare(task);
4759                 return -EAGAIN;
4760         }
4761         return 0;
4762 }
4763
4764 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4765 {
4766         if (!nfs4_sequence_done(task, &data->res.seq_res))
4767                 return -EAGAIN;
4768         return data->commit_done_cb(task, data);
4769 }
4770
4771 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4772 {
4773         struct nfs_server *server = NFS_SERVER(data->inode);
4774
4775         if (data->commit_done_cb == NULL)
4776                 data->commit_done_cb = nfs4_commit_done_cb;
4777         data->res.server = server;
4778         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4779         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4780 }
4781
4782 struct nfs4_renewdata {
4783         struct nfs_client       *client;
4784         unsigned long           timestamp;
4785 };
4786
4787 /*
4788  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4789  * standalone procedure for queueing an asynchronous RENEW.
4790  */
4791 static void nfs4_renew_release(void *calldata)
4792 {
4793         struct nfs4_renewdata *data = calldata;
4794         struct nfs_client *clp = data->client;
4795
4796         if (atomic_read(&clp->cl_count) > 1)
4797                 nfs4_schedule_state_renewal(clp);
4798         nfs_put_client(clp);
4799         kfree(data);
4800 }
4801
4802 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4803 {
4804         struct nfs4_renewdata *data = calldata;
4805         struct nfs_client *clp = data->client;
4806         unsigned long timestamp = data->timestamp;
4807
4808         trace_nfs4_renew_async(clp, task->tk_status);
4809         switch (task->tk_status) {
4810         case 0:
4811                 break;
4812         case -NFS4ERR_LEASE_MOVED:
4813                 nfs4_schedule_lease_moved_recovery(clp);
4814                 break;
4815         default:
4816                 /* Unless we're shutting down, schedule state recovery! */
4817                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4818                         return;
4819                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4820                         nfs4_schedule_lease_recovery(clp);
4821                         return;
4822                 }
4823                 nfs4_schedule_path_down_recovery(clp);
4824         }
4825         do_renew_lease(clp, timestamp);
4826 }
4827
4828 static const struct rpc_call_ops nfs4_renew_ops = {
4829         .rpc_call_done = nfs4_renew_done,
4830         .rpc_release = nfs4_renew_release,
4831 };
4832
4833 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4834 {
4835         struct rpc_message msg = {
4836                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4837                 .rpc_argp       = clp,
4838                 .rpc_cred       = cred,
4839         };
4840         struct nfs4_renewdata *data;
4841
4842         if (renew_flags == 0)
4843                 return 0;
4844         if (!atomic_inc_not_zero(&clp->cl_count))
4845                 return -EIO;
4846         data = kmalloc(sizeof(*data), GFP_NOFS);
4847         if (data == NULL)
4848                 return -ENOMEM;
4849         data->client = clp;
4850         data->timestamp = jiffies;
4851         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4852                         &nfs4_renew_ops, data);
4853 }
4854
4855 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4856 {
4857         struct rpc_message msg = {
4858                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4859                 .rpc_argp       = clp,
4860                 .rpc_cred       = cred,
4861         };
4862         unsigned long now = jiffies;
4863         int status;
4864
4865         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4866         if (status < 0)
4867                 return status;
4868         do_renew_lease(clp, now);
4869         return 0;
4870 }
4871
4872 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4873 {
4874         return server->caps & NFS_CAP_ACLS;
4875 }
4876
4877 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4878  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4879  * the stack.
4880  */
4881 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4882
4883 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4884                 struct page **pages)
4885 {
4886         struct page *newpage, **spages;
4887         int rc = 0;
4888         size_t len;
4889         spages = pages;
4890
4891         do {
4892                 len = min_t(size_t, PAGE_SIZE, buflen);
4893                 newpage = alloc_page(GFP_KERNEL);
4894
4895                 if (newpage == NULL)
4896                         goto unwind;
4897                 memcpy(page_address(newpage), buf, len);
4898                 buf += len;
4899                 buflen -= len;
4900                 *pages++ = newpage;
4901                 rc++;
4902         } while (buflen != 0);
4903
4904         return rc;
4905
4906 unwind:
4907         for(; rc > 0; rc--)
4908                 __free_page(spages[rc-1]);
4909         return -ENOMEM;
4910 }
4911
4912 struct nfs4_cached_acl {
4913         int cached;
4914         size_t len;
4915         char data[0];
4916 };
4917
4918 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4919 {
4920         struct nfs_inode *nfsi = NFS_I(inode);
4921
4922         spin_lock(&inode->i_lock);
4923         kfree(nfsi->nfs4_acl);
4924         nfsi->nfs4_acl = acl;
4925         spin_unlock(&inode->i_lock);
4926 }
4927
4928 static void nfs4_zap_acl_attr(struct inode *inode)
4929 {
4930         nfs4_set_cached_acl(inode, NULL);
4931 }
4932
4933 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4934 {
4935         struct nfs_inode *nfsi = NFS_I(inode);
4936         struct nfs4_cached_acl *acl;
4937         int ret = -ENOENT;
4938
4939         spin_lock(&inode->i_lock);
4940         acl = nfsi->nfs4_acl;
4941         if (acl == NULL)
4942                 goto out;
4943         if (buf == NULL) /* user is just asking for length */
4944                 goto out_len;
4945         if (acl->cached == 0)
4946                 goto out;
4947         ret = -ERANGE; /* see getxattr(2) man page */
4948         if (acl->len > buflen)
4949                 goto out;
4950         memcpy(buf, acl->data, acl->len);
4951 out_len:
4952         ret = acl->len;
4953 out:
4954         spin_unlock(&inode->i_lock);
4955         return ret;
4956 }
4957
4958 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4959 {
4960         struct nfs4_cached_acl *acl;
4961         size_t buflen = sizeof(*acl) + acl_len;
4962
4963         if (buflen <= PAGE_SIZE) {
4964                 acl = kmalloc(buflen, GFP_KERNEL);
4965                 if (acl == NULL)
4966                         goto out;
4967                 acl->cached = 1;
4968                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4969         } else {
4970                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4971                 if (acl == NULL)
4972                         goto out;
4973                 acl->cached = 0;
4974         }
4975         acl->len = acl_len;
4976 out:
4977         nfs4_set_cached_acl(inode, acl);
4978 }
4979
4980 /*
4981  * The getxattr API returns the required buffer length when called with a
4982  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4983  * the required buf.  On a NULL buf, we send a page of data to the server
4984  * guessing that the ACL request can be serviced by a page. If so, we cache
4985  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4986  * the cache. If not so, we throw away the page, and cache the required
4987  * length. The next getxattr call will then produce another round trip to
4988  * the server, this time with the input buf of the required size.
4989  */
4990 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4991 {
4992         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4993         struct nfs_getaclargs args = {
4994                 .fh = NFS_FH(inode),
4995                 .acl_pages = pages,
4996                 .acl_len = buflen,
4997         };
4998         struct nfs_getaclres res = {
4999                 .acl_len = buflen,
5000         };
5001         struct rpc_message msg = {
5002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5003                 .rpc_argp = &args,
5004                 .rpc_resp = &res,
5005         };
5006         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5007         int ret = -ENOMEM, i;
5008
5009         /* As long as we're doing a round trip to the server anyway,
5010          * let's be prepared for a page of acl data. */
5011         if (npages == 0)
5012                 npages = 1;
5013         if (npages > ARRAY_SIZE(pages))
5014                 return -ERANGE;
5015
5016         for (i = 0; i < npages; i++) {
5017                 pages[i] = alloc_page(GFP_KERNEL);
5018                 if (!pages[i])
5019                         goto out_free;
5020         }
5021
5022         /* for decoding across pages */
5023         res.acl_scratch = alloc_page(GFP_KERNEL);
5024         if (!res.acl_scratch)
5025                 goto out_free;
5026
5027         args.acl_len = npages * PAGE_SIZE;
5028
5029         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5030                 __func__, buf, buflen, npages, args.acl_len);
5031         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5032                              &msg, &args.seq_args, &res.seq_res, 0);
5033         if (ret)
5034                 goto out_free;
5035
5036         /* Handle the case where the passed-in buffer is too short */
5037         if (res.acl_flags & NFS4_ACL_TRUNC) {
5038                 /* Did the user only issue a request for the acl length? */
5039                 if (buf == NULL)
5040                         goto out_ok;
5041                 ret = -ERANGE;
5042                 goto out_free;
5043         }
5044         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5045         if (buf) {
5046                 if (res.acl_len > buflen) {
5047                         ret = -ERANGE;
5048                         goto out_free;
5049                 }
5050                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5051         }
5052 out_ok:
5053         ret = res.acl_len;
5054 out_free:
5055         for (i = 0; i < npages; i++)
5056                 if (pages[i])
5057                         __free_page(pages[i]);
5058         if (res.acl_scratch)
5059                 __free_page(res.acl_scratch);
5060         return ret;
5061 }
5062
5063 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5064 {
5065         struct nfs4_exception exception = { };
5066         ssize_t ret;
5067         do {
5068                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5069                 trace_nfs4_get_acl(inode, ret);
5070                 if (ret >= 0)
5071                         break;
5072                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5073         } while (exception.retry);
5074         return ret;
5075 }
5076
5077 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5078 {
5079         struct nfs_server *server = NFS_SERVER(inode);
5080         int ret;
5081
5082         if (!nfs4_server_supports_acls(server))
5083                 return -EOPNOTSUPP;
5084         ret = nfs_revalidate_inode(server, inode);
5085         if (ret < 0)
5086                 return ret;
5087         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5088                 nfs_zap_acl_cache(inode);
5089         ret = nfs4_read_cached_acl(inode, buf, buflen);
5090         if (ret != -ENOENT)
5091                 /* -ENOENT is returned if there is no ACL or if there is an ACL
5092                  * but no cached acl data, just the acl length */
5093                 return ret;
5094         return nfs4_get_acl_uncached(inode, buf, buflen);
5095 }
5096
5097 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5098 {
5099         struct nfs_server *server = NFS_SERVER(inode);
5100         struct page *pages[NFS4ACL_MAXPAGES];
5101         struct nfs_setaclargs arg = {
5102                 .fh             = NFS_FH(inode),
5103                 .acl_pages      = pages,
5104                 .acl_len        = buflen,
5105         };
5106         struct nfs_setaclres res;
5107         struct rpc_message msg = {
5108                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5109                 .rpc_argp       = &arg,
5110                 .rpc_resp       = &res,
5111         };
5112         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5113         int ret, i;
5114
5115         if (!nfs4_server_supports_acls(server))
5116                 return -EOPNOTSUPP;
5117         if (npages > ARRAY_SIZE(pages))
5118                 return -ERANGE;
5119         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5120         if (i < 0)
5121                 return i;
5122         nfs4_inode_return_delegation(inode);
5123         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5124
5125         /*
5126          * Free each page after tx, so the only ref left is
5127          * held by the network stack
5128          */
5129         for (; i > 0; i--)
5130                 put_page(pages[i-1]);
5131
5132         /*
5133          * Acl update can result in inode attribute update.
5134          * so mark the attribute cache invalid.
5135          */
5136         spin_lock(&inode->i_lock);
5137         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
5138         spin_unlock(&inode->i_lock);
5139         nfs_access_zap_cache(inode);
5140         nfs_zap_acl_cache(inode);
5141         return ret;
5142 }
5143
5144 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5145 {
5146         struct nfs4_exception exception = { };
5147         int err;
5148         do {
5149                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5150                 trace_nfs4_set_acl(inode, err);
5151                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5152                                 &exception);
5153         } while (exception.retry);
5154         return err;
5155 }
5156
5157 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5158 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5159                                         size_t buflen)
5160 {
5161         struct nfs_server *server = NFS_SERVER(inode);
5162         struct nfs_fattr fattr;
5163         struct nfs4_label label = {0, 0, buflen, buf};
5164
5165         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5166         struct nfs4_getattr_arg arg = {
5167                 .fh             = NFS_FH(inode),
5168                 .bitmask        = bitmask,
5169         };
5170         struct nfs4_getattr_res res = {
5171                 .fattr          = &fattr,
5172                 .label          = &label,
5173                 .server         = server,
5174         };
5175         struct rpc_message msg = {
5176                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5177                 .rpc_argp       = &arg,
5178                 .rpc_resp       = &res,
5179         };
5180         int ret;
5181
5182         nfs_fattr_init(&fattr);
5183
5184         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5185         if (ret)
5186                 return ret;
5187         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5188                 return -ENOENT;
5189         if (buflen < label.len)
5190                 return -ERANGE;
5191         return 0;
5192 }
5193
5194 static int nfs4_get_security_label(struct inode *inode, void *buf,
5195                                         size_t buflen)
5196 {
5197         struct nfs4_exception exception = { };
5198         int err;
5199
5200         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5201                 return -EOPNOTSUPP;
5202
5203         do {
5204                 err = _nfs4_get_security_label(inode, buf, buflen);
5205                 trace_nfs4_get_security_label(inode, err);
5206                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5207                                 &exception);
5208         } while (exception.retry);
5209         return err;
5210 }
5211
5212 static int _nfs4_do_set_security_label(struct inode *inode,
5213                 struct nfs4_label *ilabel,
5214                 struct nfs_fattr *fattr,
5215                 struct nfs4_label *olabel)
5216 {
5217
5218         struct iattr sattr = {0};
5219         struct nfs_server *server = NFS_SERVER(inode);
5220         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5221         struct nfs_setattrargs arg = {
5222                 .fh             = NFS_FH(inode),
5223                 .iap            = &sattr,
5224                 .server         = server,
5225                 .bitmask        = bitmask,
5226                 .label          = ilabel,
5227         };
5228         struct nfs_setattrres res = {
5229                 .fattr          = fattr,
5230                 .label          = olabel,
5231                 .server         = server,
5232         };
5233         struct rpc_message msg = {
5234                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5235                 .rpc_argp       = &arg,
5236                 .rpc_resp       = &res,
5237         };
5238         int status;
5239
5240         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5241
5242         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5243         if (status)
5244                 dprintk("%s failed: %d\n", __func__, status);
5245
5246         return status;
5247 }
5248
5249 static int nfs4_do_set_security_label(struct inode *inode,
5250                 struct nfs4_label *ilabel,
5251                 struct nfs_fattr *fattr,
5252                 struct nfs4_label *olabel)
5253 {
5254         struct nfs4_exception exception = { };
5255         int err;
5256
5257         do {
5258                 err = _nfs4_do_set_security_label(inode, ilabel,
5259                                 fattr, olabel);
5260                 trace_nfs4_set_security_label(inode, err);
5261                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5262                                 &exception);
5263         } while (exception.retry);
5264         return err;
5265 }
5266
5267 static int
5268 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5269 {
5270         struct nfs4_label ilabel, *olabel = NULL;
5271         struct nfs_fattr fattr;
5272         struct rpc_cred *cred;
5273         int status;
5274
5275         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5276                 return -EOPNOTSUPP;
5277
5278         nfs_fattr_init(&fattr);
5279
5280         ilabel.pi = 0;
5281         ilabel.lfs = 0;
5282         ilabel.label = (char *)buf;
5283         ilabel.len = buflen;
5284
5285         cred = rpc_lookup_cred();
5286         if (IS_ERR(cred))
5287                 return PTR_ERR(cred);
5288
5289         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5290         if (IS_ERR(olabel)) {
5291                 status = -PTR_ERR(olabel);
5292                 goto out;
5293         }
5294
5295         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5296         if (status == 0)
5297                 nfs_setsecurity(inode, &fattr, olabel);
5298
5299         nfs4_label_free(olabel);
5300 out:
5301         put_rpccred(cred);
5302         return status;
5303 }
5304 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5305
5306
5307 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5308                                     nfs4_verifier *bootverf)
5309 {
5310         __be32 verf[2];
5311
5312         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5313                 /* An impossible timestamp guarantees this value
5314                  * will never match a generated boot time. */
5315                 verf[0] = cpu_to_be32(U32_MAX);
5316                 verf[1] = cpu_to_be32(U32_MAX);
5317         } else {
5318                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5319                 u64 ns = ktime_to_ns(nn->boot_time);
5320
5321                 verf[0] = cpu_to_be32(ns >> 32);
5322                 verf[1] = cpu_to_be32(ns);
5323         }
5324         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5325 }
5326
5327 static int
5328 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5329 {
5330         size_t len;
5331         char *str;
5332
5333         if (clp->cl_owner_id != NULL)
5334                 return 0;
5335
5336         rcu_read_lock();
5337         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5338                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5339                 1 +
5340                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5341                 1;
5342         rcu_read_unlock();
5343
5344         if (len > NFS4_OPAQUE_LIMIT + 1)
5345                 return -EINVAL;
5346
5347         /*
5348          * Since this string is allocated at mount time, and held until the
5349          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5350          * about a memory-reclaim deadlock.
5351          */
5352         str = kmalloc(len, GFP_KERNEL);
5353         if (!str)
5354                 return -ENOMEM;
5355
5356         rcu_read_lock();
5357         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5358                         clp->cl_ipaddr,
5359                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5360                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5361         rcu_read_unlock();
5362
5363         clp->cl_owner_id = str;
5364         return 0;
5365 }
5366
5367 static int
5368 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5369 {
5370         size_t len;
5371         char *str;
5372
5373         len = 10 + 10 + 1 + 10 + 1 +
5374                 strlen(nfs4_client_id_uniquifier) + 1 +
5375                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5376
5377         if (len > NFS4_OPAQUE_LIMIT + 1)
5378                 return -EINVAL;
5379
5380         /*
5381          * Since this string is allocated at mount time, and held until the
5382          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5383          * about a memory-reclaim deadlock.
5384          */
5385         str = kmalloc(len, GFP_KERNEL);
5386         if (!str)
5387                 return -ENOMEM;
5388
5389         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5390                         clp->rpc_ops->version, clp->cl_minorversion,
5391                         nfs4_client_id_uniquifier,
5392                         clp->cl_rpcclient->cl_nodename);
5393         clp->cl_owner_id = str;
5394         return 0;
5395 }
5396
5397 static int
5398 nfs4_init_uniform_client_string(struct nfs_client *clp)
5399 {
5400         size_t len;
5401         char *str;
5402
5403         if (clp->cl_owner_id != NULL)
5404                 return 0;
5405
5406         if (nfs4_client_id_uniquifier[0] != '\0')
5407                 return nfs4_init_uniquifier_client_string(clp);
5408
5409         len = 10 + 10 + 1 + 10 + 1 +
5410                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5411
5412         if (len > NFS4_OPAQUE_LIMIT + 1)
5413                 return -EINVAL;
5414
5415         /*
5416          * Since this string is allocated at mount time, and held until the
5417          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5418          * about a memory-reclaim deadlock.
5419          */
5420         str = kmalloc(len, GFP_KERNEL);
5421         if (!str)
5422                 return -ENOMEM;
5423
5424         scnprintf(str, len, "Linux NFSv%u.%u %s",
5425                         clp->rpc_ops->version, clp->cl_minorversion,
5426                         clp->cl_rpcclient->cl_nodename);
5427         clp->cl_owner_id = str;
5428         return 0;
5429 }
5430
5431 /*
5432  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5433  * services.  Advertise one based on the address family of the
5434  * clientaddr.
5435  */
5436 static unsigned int
5437 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5438 {
5439         if (strchr(clp->cl_ipaddr, ':') != NULL)
5440                 return scnprintf(buf, len, "tcp6");
5441         else
5442                 return scnprintf(buf, len, "tcp");
5443 }
5444
5445 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5446 {
5447         struct nfs4_setclientid *sc = calldata;
5448
5449         if (task->tk_status == 0)
5450                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5451 }
5452
5453 static const struct rpc_call_ops nfs4_setclientid_ops = {
5454         .rpc_call_done = nfs4_setclientid_done,
5455 };
5456
5457 /**
5458  * nfs4_proc_setclientid - Negotiate client ID
5459  * @clp: state data structure
5460  * @program: RPC program for NFSv4 callback service
5461  * @port: IP port number for NFS4 callback service
5462  * @cred: RPC credential to use for this call
5463  * @res: where to place the result
5464  *
5465  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5466  */
5467 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5468                 unsigned short port, struct rpc_cred *cred,
5469                 struct nfs4_setclientid_res *res)
5470 {
5471         nfs4_verifier sc_verifier;
5472         struct nfs4_setclientid setclientid = {
5473                 .sc_verifier = &sc_verifier,
5474                 .sc_prog = program,
5475                 .sc_clnt = clp,
5476         };
5477         struct rpc_message msg = {
5478                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5479                 .rpc_argp = &setclientid,
5480                 .rpc_resp = res,
5481                 .rpc_cred = cred,
5482         };
5483         struct rpc_task *task;
5484         struct rpc_task_setup task_setup_data = {
5485                 .rpc_client = clp->cl_rpcclient,
5486                 .rpc_message = &msg,
5487                 .callback_ops = &nfs4_setclientid_ops,
5488                 .callback_data = &setclientid,
5489                 .flags = RPC_TASK_TIMEOUT,
5490         };
5491         int status;
5492
5493         /* nfs_client_id4 */
5494         nfs4_init_boot_verifier(clp, &sc_verifier);
5495
5496         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5497                 status = nfs4_init_uniform_client_string(clp);
5498         else
5499                 status = nfs4_init_nonuniform_client_string(clp);
5500
5501         if (status)
5502                 goto out;
5503
5504         /* cb_client4 */
5505         setclientid.sc_netid_len =
5506                                 nfs4_init_callback_netid(clp,
5507                                                 setclientid.sc_netid,
5508                                                 sizeof(setclientid.sc_netid));
5509         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5510                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5511                                 clp->cl_ipaddr, port >> 8, port & 255);
5512
5513         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5514                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5515                 clp->cl_owner_id);
5516         task = rpc_run_task(&task_setup_data);
5517         if (IS_ERR(task)) {
5518                 status = PTR_ERR(task);
5519                 goto out;
5520         }
5521         status = task->tk_status;
5522         if (setclientid.sc_cred) {
5523                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5524                 put_rpccred(setclientid.sc_cred);
5525         }
5526         rpc_put_task(task);
5527 out:
5528         trace_nfs4_setclientid(clp, status);
5529         dprintk("NFS reply setclientid: %d\n", status);
5530         return status;
5531 }
5532
5533 /**
5534  * nfs4_proc_setclientid_confirm - Confirm client ID
5535  * @clp: state data structure
5536  * @res: result of a previous SETCLIENTID
5537  * @cred: RPC credential to use for this call
5538  *
5539  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5540  */
5541 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5542                 struct nfs4_setclientid_res *arg,
5543                 struct rpc_cred *cred)
5544 {
5545         struct rpc_message msg = {
5546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5547                 .rpc_argp = arg,
5548                 .rpc_cred = cred,
5549         };
5550         int status;
5551
5552         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5553                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5554                 clp->cl_clientid);
5555         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5556         trace_nfs4_setclientid_confirm(clp, status);
5557         dprintk("NFS reply setclientid_confirm: %d\n", status);
5558         return status;
5559 }
5560
5561 struct nfs4_delegreturndata {
5562         struct nfs4_delegreturnargs args;
5563         struct nfs4_delegreturnres res;
5564         struct nfs_fh fh;
5565         nfs4_stateid stateid;
5566         unsigned long timestamp;
5567         struct nfs_fattr fattr;
5568         int rpc_status;
5569         struct inode *inode;
5570         bool roc;
5571         u32 roc_barrier;
5572 };
5573
5574 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5575 {
5576         struct nfs4_delegreturndata *data = calldata;
5577
5578         if (!nfs4_sequence_done(task, &data->res.seq_res))
5579                 return;
5580
5581         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5582         switch (task->tk_status) {
5583         case 0:
5584                 renew_lease(data->res.server, data->timestamp);
5585                 break;
5586         case -NFS4ERR_ADMIN_REVOKED:
5587         case -NFS4ERR_DELEG_REVOKED:
5588         case -NFS4ERR_EXPIRED:
5589                 nfs4_free_revoked_stateid(data->res.server,
5590                                 data->args.stateid,
5591                                 task->tk_msg.rpc_cred);
5592         case -NFS4ERR_BAD_STATEID:
5593         case -NFS4ERR_OLD_STATEID:
5594         case -NFS4ERR_STALE_STATEID:
5595                 task->tk_status = 0;
5596                 break;
5597         default:
5598                 if (nfs4_async_handle_error(task, data->res.server,
5599                                             NULL, NULL) == -EAGAIN) {
5600                         rpc_restart_call_prepare(task);
5601                         return;
5602                 }
5603         }
5604         data->rpc_status = task->tk_status;
5605         if (data->roc && data->rpc_status == 0)
5606                 pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5607 }
5608
5609 static void nfs4_delegreturn_release(void *calldata)
5610 {
5611         struct nfs4_delegreturndata *data = calldata;
5612         struct inode *inode = data->inode;
5613
5614         if (inode) {
5615                 if (data->roc)
5616                         pnfs_roc_release(inode);
5617                 nfs_iput_and_deactive(inode);
5618         }
5619         kfree(calldata);
5620 }
5621
5622 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5623 {
5624         struct nfs4_delegreturndata *d_data;
5625
5626         d_data = (struct nfs4_delegreturndata *)data;
5627
5628         if (nfs4_wait_on_layoutreturn(d_data->inode, task))
5629                 return;
5630
5631         if (d_data->roc)
5632                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5633
5634         nfs4_setup_sequence(d_data->res.server,
5635                         &d_data->args.seq_args,
5636                         &d_data->res.seq_res,
5637                         task);
5638 }
5639
5640 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5641         .rpc_call_prepare = nfs4_delegreturn_prepare,
5642         .rpc_call_done = nfs4_delegreturn_done,
5643         .rpc_release = nfs4_delegreturn_release,
5644 };
5645
5646 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5647 {
5648         struct nfs4_delegreturndata *data;
5649         struct nfs_server *server = NFS_SERVER(inode);
5650         struct rpc_task *task;
5651         struct rpc_message msg = {
5652                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5653                 .rpc_cred = cred,
5654         };
5655         struct rpc_task_setup task_setup_data = {
5656                 .rpc_client = server->client,
5657                 .rpc_message = &msg,
5658                 .callback_ops = &nfs4_delegreturn_ops,
5659                 .flags = RPC_TASK_ASYNC,
5660         };
5661         int status = 0;
5662
5663         data = kzalloc(sizeof(*data), GFP_NOFS);
5664         if (data == NULL)
5665                 return -ENOMEM;
5666         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5667
5668         nfs4_state_protect(server->nfs_client,
5669                         NFS_SP4_MACH_CRED_CLEANUP,
5670                         &task_setup_data.rpc_client, &msg);
5671
5672         data->args.fhandle = &data->fh;
5673         data->args.stateid = &data->stateid;
5674         data->args.bitmask = server->cache_consistency_bitmask;
5675         nfs_copy_fh(&data->fh, NFS_FH(inode));
5676         nfs4_stateid_copy(&data->stateid, stateid);
5677         data->res.fattr = &data->fattr;
5678         data->res.server = server;
5679         nfs_fattr_init(data->res.fattr);
5680         data->timestamp = jiffies;
5681         data->rpc_status = 0;
5682         data->inode = nfs_igrab_and_active(inode);
5683         if (data->inode)
5684                 data->roc = nfs4_roc(inode);
5685
5686         task_setup_data.callback_data = data;
5687         msg.rpc_argp = &data->args;
5688         msg.rpc_resp = &data->res;
5689         task = rpc_run_task(&task_setup_data);
5690         if (IS_ERR(task))
5691                 return PTR_ERR(task);
5692         if (!issync)
5693                 goto out;
5694         status = nfs4_wait_for_completion_rpc_task(task);
5695         if (status != 0)
5696                 goto out;
5697         status = data->rpc_status;
5698         if (status == 0)
5699                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5700         else
5701                 nfs_refresh_inode(inode, &data->fattr);
5702 out:
5703         rpc_put_task(task);
5704         return status;
5705 }
5706
5707 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5708 {
5709         struct nfs_server *server = NFS_SERVER(inode);
5710         struct nfs4_exception exception = { };
5711         int err;
5712         do {
5713                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5714                 trace_nfs4_delegreturn(inode, stateid, err);
5715                 switch (err) {
5716                         case -NFS4ERR_STALE_STATEID:
5717                         case -NFS4ERR_EXPIRED:
5718                         case 0:
5719                                 return 0;
5720                 }
5721                 err = nfs4_handle_exception(server, err, &exception);
5722         } while (exception.retry);
5723         return err;
5724 }
5725
5726 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5727 {
5728         struct inode *inode = state->inode;
5729         struct nfs_server *server = NFS_SERVER(inode);
5730         struct nfs_client *clp = server->nfs_client;
5731         struct nfs_lockt_args arg = {
5732                 .fh = NFS_FH(inode),
5733                 .fl = request,
5734         };
5735         struct nfs_lockt_res res = {
5736                 .denied = request,
5737         };
5738         struct rpc_message msg = {
5739                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5740                 .rpc_argp       = &arg,
5741                 .rpc_resp       = &res,
5742                 .rpc_cred       = state->owner->so_cred,
5743         };
5744         struct nfs4_lock_state *lsp;
5745         int status;
5746
5747         arg.lock_owner.clientid = clp->cl_clientid;
5748         status = nfs4_set_lock_state(state, request);
5749         if (status != 0)
5750                 goto out;
5751         lsp = request->fl_u.nfs4_fl.owner;
5752         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5753         arg.lock_owner.s_dev = server->s_dev;
5754         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5755         switch (status) {
5756                 case 0:
5757                         request->fl_type = F_UNLCK;
5758                         break;
5759                 case -NFS4ERR_DENIED:
5760                         status = 0;
5761         }
5762         request->fl_ops->fl_release_private(request);
5763         request->fl_ops = NULL;
5764 out:
5765         return status;
5766 }
5767
5768 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5769 {
5770         struct nfs4_exception exception = { };
5771         int err;
5772
5773         do {
5774                 err = _nfs4_proc_getlk(state, cmd, request);
5775                 trace_nfs4_get_lock(request, state, cmd, err);
5776                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5777                                 &exception);
5778         } while (exception.retry);
5779         return err;
5780 }
5781
5782 struct nfs4_unlockdata {
5783         struct nfs_locku_args arg;
5784         struct nfs_locku_res res;
5785         struct nfs4_lock_state *lsp;
5786         struct nfs_open_context *ctx;
5787         struct file_lock fl;
5788         struct nfs_server *server;
5789         unsigned long timestamp;
5790 };
5791
5792 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5793                 struct nfs_open_context *ctx,
5794                 struct nfs4_lock_state *lsp,
5795                 struct nfs_seqid *seqid)
5796 {
5797         struct nfs4_unlockdata *p;
5798         struct inode *inode = lsp->ls_state->inode;
5799
5800         p = kzalloc(sizeof(*p), GFP_NOFS);
5801         if (p == NULL)
5802                 return NULL;
5803         p->arg.fh = NFS_FH(inode);
5804         p->arg.fl = &p->fl;
5805         p->arg.seqid = seqid;
5806         p->res.seqid = seqid;
5807         p->lsp = lsp;
5808         atomic_inc(&lsp->ls_count);
5809         /* Ensure we don't close file until we're done freeing locks! */
5810         p->ctx = get_nfs_open_context(ctx);
5811         memcpy(&p->fl, fl, sizeof(p->fl));
5812         p->server = NFS_SERVER(inode);
5813         return p;
5814 }
5815
5816 static void nfs4_locku_release_calldata(void *data)
5817 {
5818         struct nfs4_unlockdata *calldata = data;
5819         nfs_free_seqid(calldata->arg.seqid);
5820         nfs4_put_lock_state(calldata->lsp);
5821         put_nfs_open_context(calldata->ctx);
5822         kfree(calldata);
5823 }
5824
5825 static void nfs4_locku_done(struct rpc_task *task, void *data)
5826 {
5827         struct nfs4_unlockdata *calldata = data;
5828
5829         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5830                 return;
5831         switch (task->tk_status) {
5832                 case 0:
5833                         renew_lease(calldata->server, calldata->timestamp);
5834                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
5835                         if (nfs4_update_lock_stateid(calldata->lsp,
5836                                         &calldata->res.stateid))
5837                                 break;
5838                 case -NFS4ERR_ADMIN_REVOKED:
5839                 case -NFS4ERR_EXPIRED:
5840                         nfs4_free_revoked_stateid(calldata->server,
5841                                         &calldata->arg.stateid,
5842                                         task->tk_msg.rpc_cred);
5843                 case -NFS4ERR_BAD_STATEID:
5844                 case -NFS4ERR_OLD_STATEID:
5845                 case -NFS4ERR_STALE_STATEID:
5846                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5847                                                 &calldata->lsp->ls_stateid))
5848                                 rpc_restart_call_prepare(task);
5849                         break;
5850                 default:
5851                         if (nfs4_async_handle_error(task, calldata->server,
5852                                                     NULL, NULL) == -EAGAIN)
5853                                 rpc_restart_call_prepare(task);
5854         }
5855         nfs_release_seqid(calldata->arg.seqid);
5856 }
5857
5858 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5859 {
5860         struct nfs4_unlockdata *calldata = data;
5861
5862         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5863                 goto out_wait;
5864         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5865         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5866                 /* Note: exit _without_ running nfs4_locku_done */
5867                 goto out_no_action;
5868         }
5869         calldata->timestamp = jiffies;
5870         if (nfs4_setup_sequence(calldata->server,
5871                                 &calldata->arg.seq_args,
5872                                 &calldata->res.seq_res,
5873                                 task) != 0)
5874                 nfs_release_seqid(calldata->arg.seqid);
5875         return;
5876 out_no_action:
5877         task->tk_action = NULL;
5878 out_wait:
5879         nfs4_sequence_done(task, &calldata->res.seq_res);
5880 }
5881
5882 static const struct rpc_call_ops nfs4_locku_ops = {
5883         .rpc_call_prepare = nfs4_locku_prepare,
5884         .rpc_call_done = nfs4_locku_done,
5885         .rpc_release = nfs4_locku_release_calldata,
5886 };
5887
5888 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5889                 struct nfs_open_context *ctx,
5890                 struct nfs4_lock_state *lsp,
5891                 struct nfs_seqid *seqid)
5892 {
5893         struct nfs4_unlockdata *data;
5894         struct rpc_message msg = {
5895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5896                 .rpc_cred = ctx->cred,
5897         };
5898         struct rpc_task_setup task_setup_data = {
5899                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5900                 .rpc_message = &msg,
5901                 .callback_ops = &nfs4_locku_ops,
5902                 .workqueue = nfsiod_workqueue,
5903                 .flags = RPC_TASK_ASYNC,
5904         };
5905
5906         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5907                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5908
5909         /* Ensure this is an unlock - when canceling a lock, the
5910          * canceled lock is passed in, and it won't be an unlock.
5911          */
5912         fl->fl_type = F_UNLCK;
5913
5914         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5915         if (data == NULL) {
5916                 nfs_free_seqid(seqid);
5917                 return ERR_PTR(-ENOMEM);
5918         }
5919
5920         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5921         msg.rpc_argp = &data->arg;
5922         msg.rpc_resp = &data->res;
5923         task_setup_data.callback_data = data;
5924         return rpc_run_task(&task_setup_data);
5925 }
5926
5927 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5928 {
5929         struct inode *inode = state->inode;
5930         struct nfs4_state_owner *sp = state->owner;
5931         struct nfs_inode *nfsi = NFS_I(inode);
5932         struct nfs_seqid *seqid;
5933         struct nfs4_lock_state *lsp;
5934         struct rpc_task *task;
5935         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5936         int status = 0;
5937         unsigned char fl_flags = request->fl_flags;
5938
5939         status = nfs4_set_lock_state(state, request);
5940         /* Unlock _before_ we do the RPC call */
5941         request->fl_flags |= FL_EXISTS;
5942         /* Exclude nfs_delegation_claim_locks() */
5943         mutex_lock(&sp->so_delegreturn_mutex);
5944         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5945         down_read(&nfsi->rwsem);
5946         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
5947                 up_read(&nfsi->rwsem);
5948                 mutex_unlock(&sp->so_delegreturn_mutex);
5949                 goto out;
5950         }
5951         up_read(&nfsi->rwsem);
5952         mutex_unlock(&sp->so_delegreturn_mutex);
5953         if (status != 0)
5954                 goto out;
5955         /* Is this a delegated lock? */
5956         lsp = request->fl_u.nfs4_fl.owner;
5957         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5958                 goto out;
5959         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5960         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5961         status = -ENOMEM;
5962         if (IS_ERR(seqid))
5963                 goto out;
5964         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5965         status = PTR_ERR(task);
5966         if (IS_ERR(task))
5967                 goto out;
5968         status = nfs4_wait_for_completion_rpc_task(task);
5969         rpc_put_task(task);
5970 out:
5971         request->fl_flags = fl_flags;
5972         trace_nfs4_unlock(request, state, F_SETLK, status);
5973         return status;
5974 }
5975
5976 struct nfs4_lockdata {
5977         struct nfs_lock_args arg;
5978         struct nfs_lock_res res;
5979         struct nfs4_lock_state *lsp;
5980         struct nfs_open_context *ctx;
5981         struct file_lock fl;
5982         unsigned long timestamp;
5983         int rpc_status;
5984         int cancelled;
5985         struct nfs_server *server;
5986 };
5987
5988 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5989                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5990                 gfp_t gfp_mask)
5991 {
5992         struct nfs4_lockdata *p;
5993         struct inode *inode = lsp->ls_state->inode;
5994         struct nfs_server *server = NFS_SERVER(inode);
5995         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5996
5997         p = kzalloc(sizeof(*p), gfp_mask);
5998         if (p == NULL)
5999                 return NULL;
6000
6001         p->arg.fh = NFS_FH(inode);
6002         p->arg.fl = &p->fl;
6003         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6004         if (IS_ERR(p->arg.open_seqid))
6005                 goto out_free;
6006         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6007         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6008         if (IS_ERR(p->arg.lock_seqid))
6009                 goto out_free_seqid;
6010         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6011         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6012         p->arg.lock_owner.s_dev = server->s_dev;
6013         p->res.lock_seqid = p->arg.lock_seqid;
6014         p->lsp = lsp;
6015         p->server = server;
6016         atomic_inc(&lsp->ls_count);
6017         p->ctx = get_nfs_open_context(ctx);
6018         get_file(fl->fl_file);
6019         memcpy(&p->fl, fl, sizeof(p->fl));
6020         return p;
6021 out_free_seqid:
6022         nfs_free_seqid(p->arg.open_seqid);
6023 out_free:
6024         kfree(p);
6025         return NULL;
6026 }
6027
6028 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6029 {
6030         struct nfs4_lockdata *data = calldata;
6031         struct nfs4_state *state = data->lsp->ls_state;
6032
6033         dprintk("%s: begin!\n", __func__);
6034         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6035                 goto out_wait;
6036         /* Do we need to do an open_to_lock_owner? */
6037         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6038                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6039                         goto out_release_lock_seqid;
6040                 }
6041                 nfs4_stateid_copy(&data->arg.open_stateid,
6042                                 &state->open_stateid);
6043                 data->arg.new_lock_owner = 1;
6044                 data->res.open_seqid = data->arg.open_seqid;
6045         } else {
6046                 data->arg.new_lock_owner = 0;
6047                 nfs4_stateid_copy(&data->arg.lock_stateid,
6048                                 &data->lsp->ls_stateid);
6049         }
6050         if (!nfs4_valid_open_stateid(state)) {
6051                 data->rpc_status = -EBADF;
6052                 task->tk_action = NULL;
6053                 goto out_release_open_seqid;
6054         }
6055         data->timestamp = jiffies;
6056         if (nfs4_setup_sequence(data->server,
6057                                 &data->arg.seq_args,
6058                                 &data->res.seq_res,
6059                                 task) == 0)
6060                 return;
6061 out_release_open_seqid:
6062         nfs_release_seqid(data->arg.open_seqid);
6063 out_release_lock_seqid:
6064         nfs_release_seqid(data->arg.lock_seqid);
6065 out_wait:
6066         nfs4_sequence_done(task, &data->res.seq_res);
6067         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6068 }
6069
6070 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6071 {
6072         struct nfs4_lockdata *data = calldata;
6073         struct nfs4_lock_state *lsp = data->lsp;
6074
6075         dprintk("%s: begin!\n", __func__);
6076
6077         if (!nfs4_sequence_done(task, &data->res.seq_res))
6078                 return;
6079
6080         data->rpc_status = task->tk_status;
6081         switch (task->tk_status) {
6082         case 0:
6083                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6084                                 data->timestamp);
6085                 if (data->arg.new_lock) {
6086                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6087                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) {
6088                                 rpc_restart_call_prepare(task);
6089                                 break;
6090                         }
6091                 }
6092                 if (data->arg.new_lock_owner != 0) {
6093                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
6094                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6095                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6096                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
6097                         rpc_restart_call_prepare(task);
6098                 break;
6099         case -NFS4ERR_BAD_STATEID:
6100         case -NFS4ERR_OLD_STATEID:
6101         case -NFS4ERR_STALE_STATEID:
6102         case -NFS4ERR_EXPIRED:
6103                 if (data->arg.new_lock_owner != 0) {
6104                         if (!nfs4_stateid_match(&data->arg.open_stateid,
6105                                                 &lsp->ls_state->open_stateid))
6106                                 rpc_restart_call_prepare(task);
6107                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
6108                                                 &lsp->ls_stateid))
6109                                 rpc_restart_call_prepare(task);
6110         }
6111         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
6112 }
6113
6114 static void nfs4_lock_release(void *calldata)
6115 {
6116         struct nfs4_lockdata *data = calldata;
6117
6118         dprintk("%s: begin!\n", __func__);
6119         nfs_free_seqid(data->arg.open_seqid);
6120         if (data->cancelled != 0) {
6121                 struct rpc_task *task;
6122                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6123                                 data->arg.lock_seqid);
6124                 if (!IS_ERR(task))
6125                         rpc_put_task_async(task);
6126                 dprintk("%s: cancelling lock!\n", __func__);
6127         } else
6128                 nfs_free_seqid(data->arg.lock_seqid);
6129         nfs4_put_lock_state(data->lsp);
6130         put_nfs_open_context(data->ctx);
6131         fput(data->fl.fl_file);
6132         kfree(data);
6133         dprintk("%s: done!\n", __func__);
6134 }
6135
6136 static const struct rpc_call_ops nfs4_lock_ops = {
6137         .rpc_call_prepare = nfs4_lock_prepare,
6138         .rpc_call_done = nfs4_lock_done,
6139         .rpc_release = nfs4_lock_release,
6140 };
6141
6142 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6143 {
6144         switch (error) {
6145         case -NFS4ERR_ADMIN_REVOKED:
6146         case -NFS4ERR_EXPIRED:
6147         case -NFS4ERR_BAD_STATEID:
6148                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6149                 if (new_lock_owner != 0 ||
6150                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6151                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6152                 break;
6153         case -NFS4ERR_STALE_STATEID:
6154                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6155                 nfs4_schedule_lease_recovery(server->nfs_client);
6156         };
6157 }
6158
6159 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6160 {
6161         struct nfs4_lockdata *data;
6162         struct rpc_task *task;
6163         struct rpc_message msg = {
6164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6165                 .rpc_cred = state->owner->so_cred,
6166         };
6167         struct rpc_task_setup task_setup_data = {
6168                 .rpc_client = NFS_CLIENT(state->inode),
6169                 .rpc_message = &msg,
6170                 .callback_ops = &nfs4_lock_ops,
6171                 .workqueue = nfsiod_workqueue,
6172                 .flags = RPC_TASK_ASYNC,
6173         };
6174         int ret;
6175
6176         dprintk("%s: begin!\n", __func__);
6177         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6178                         fl->fl_u.nfs4_fl.owner,
6179                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6180         if (data == NULL)
6181                 return -ENOMEM;
6182         if (IS_SETLKW(cmd))
6183                 data->arg.block = 1;
6184         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
6185         msg.rpc_argp = &data->arg;
6186         msg.rpc_resp = &data->res;
6187         task_setup_data.callback_data = data;
6188         if (recovery_type > NFS_LOCK_NEW) {
6189                 if (recovery_type == NFS_LOCK_RECLAIM)
6190                         data->arg.reclaim = NFS_LOCK_RECLAIM;
6191                 nfs4_set_sequence_privileged(&data->arg.seq_args);
6192         } else
6193                 data->arg.new_lock = 1;
6194         task = rpc_run_task(&task_setup_data);
6195         if (IS_ERR(task))
6196                 return PTR_ERR(task);
6197         ret = nfs4_wait_for_completion_rpc_task(task);
6198         if (ret == 0) {
6199                 ret = data->rpc_status;
6200                 if (ret)
6201                         nfs4_handle_setlk_error(data->server, data->lsp,
6202                                         data->arg.new_lock_owner, ret);
6203         } else
6204                 data->cancelled = 1;
6205         rpc_put_task(task);
6206         dprintk("%s: done, ret = %d!\n", __func__, ret);
6207         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
6208         return ret;
6209 }
6210
6211 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
6212 {
6213         struct nfs_server *server = NFS_SERVER(state->inode);
6214         struct nfs4_exception exception = {
6215                 .inode = state->inode,
6216         };
6217         int err;
6218
6219         do {
6220                 /* Cache the lock if possible... */
6221                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6222                         return 0;
6223                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
6224                 if (err != -NFS4ERR_DELAY)
6225                         break;
6226                 nfs4_handle_exception(server, err, &exception);
6227         } while (exception.retry);
6228         return err;
6229 }
6230
6231 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6232 {
6233         struct nfs_server *server = NFS_SERVER(state->inode);
6234         struct nfs4_exception exception = {
6235                 .inode = state->inode,
6236         };
6237         int err;
6238
6239         err = nfs4_set_lock_state(state, request);
6240         if (err != 0)
6241                 return err;
6242         if (!recover_lost_locks) {
6243                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6244                 return 0;
6245         }
6246         do {
6247                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6248                         return 0;
6249                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6250                 switch (err) {
6251                 default:
6252                         goto out;
6253                 case -NFS4ERR_GRACE:
6254                 case -NFS4ERR_DELAY:
6255                         nfs4_handle_exception(server, err, &exception);
6256                         err = 0;
6257                 }
6258         } while (exception.retry);
6259 out:
6260         return err;
6261 }
6262
6263 #if defined(CONFIG_NFS_V4_1)
6264 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6265 {
6266         struct nfs4_lock_state *lsp;
6267         int status;
6268
6269         status = nfs4_set_lock_state(state, request);
6270         if (status != 0)
6271                 return status;
6272         lsp = request->fl_u.nfs4_fl.owner;
6273         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
6274             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
6275                 return 0;
6276         status = nfs4_lock_expired(state, request);
6277         return status;
6278 }
6279 #endif
6280
6281 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6282 {
6283         struct nfs_inode *nfsi = NFS_I(state->inode);
6284         struct nfs4_state_owner *sp = state->owner;
6285         unsigned char fl_flags = request->fl_flags;
6286         int status;
6287
6288         request->fl_flags |= FL_ACCESS;
6289         status = locks_lock_inode_wait(state->inode, request);
6290         if (status < 0)
6291                 goto out;
6292         mutex_lock(&sp->so_delegreturn_mutex);
6293         down_read(&nfsi->rwsem);
6294         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6295                 /* Yes: cache locks! */
6296                 /* ...but avoid races with delegation recall... */
6297                 request->fl_flags = fl_flags & ~FL_SLEEP;
6298                 status = locks_lock_inode_wait(state->inode, request);
6299                 up_read(&nfsi->rwsem);
6300                 mutex_unlock(&sp->so_delegreturn_mutex);
6301                 goto out;
6302         }
6303         up_read(&nfsi->rwsem);
6304         mutex_unlock(&sp->so_delegreturn_mutex);
6305         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6306 out:
6307         request->fl_flags = fl_flags;
6308         return status;
6309 }
6310
6311 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6312 {
6313         struct nfs4_exception exception = {
6314                 .state = state,
6315                 .inode = state->inode,
6316         };
6317         int err;
6318
6319         do {
6320                 err = _nfs4_proc_setlk(state, cmd, request);
6321                 if (err == -NFS4ERR_DENIED)
6322                         err = -EAGAIN;
6323                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6324                                 err, &exception);
6325         } while (exception.retry);
6326         return err;
6327 }
6328
6329 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
6330 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
6331
6332 static int
6333 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
6334                         struct file_lock *request)
6335 {
6336         int             status = -ERESTARTSYS;
6337         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
6338
6339         while(!signalled()) {
6340                 status = nfs4_proc_setlk(state, cmd, request);
6341                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6342                         break;
6343                 freezable_schedule_timeout_interruptible(timeout);
6344                 timeout *= 2;
6345                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
6346                 status = -ERESTARTSYS;
6347         }
6348         return status;
6349 }
6350
6351 #ifdef CONFIG_NFS_V4_1
6352 struct nfs4_lock_waiter {
6353         struct task_struct      *task;
6354         struct inode            *inode;
6355         struct nfs_lowner       *owner;
6356         bool                    notified;
6357 };
6358
6359 static int
6360 nfs4_wake_lock_waiter(wait_queue_t *wait, unsigned int mode, int flags, void *key)
6361 {
6362         int ret;
6363         struct cb_notify_lock_args *cbnl = key;
6364         struct nfs4_lock_waiter *waiter = wait->private;
6365         struct nfs_lowner       *lowner = &cbnl->cbnl_owner,
6366                                 *wowner = waiter->owner;
6367
6368         /* Only wake if the callback was for the same owner */
6369         if (lowner->clientid != wowner->clientid ||
6370             lowner->id != wowner->id             ||
6371             lowner->s_dev != wowner->s_dev)
6372                 return 0;
6373
6374         /* Make sure it's for the right inode */
6375         if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
6376                 return 0;
6377
6378         waiter->notified = true;
6379
6380         /* override "private" so we can use default_wake_function */
6381         wait->private = waiter->task;
6382         ret = autoremove_wake_function(wait, mode, flags, key);
6383         wait->private = waiter;
6384         return ret;
6385 }
6386
6387 static int
6388 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6389 {
6390         int status = -ERESTARTSYS;
6391         unsigned long flags;
6392         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
6393         struct nfs_server *server = NFS_SERVER(state->inode);
6394         struct nfs_client *clp = server->nfs_client;
6395         wait_queue_head_t *q = &clp->cl_lock_waitq;
6396         struct nfs_lowner owner = { .clientid = clp->cl_clientid,
6397                                     .id = lsp->ls_seqid.owner_id,
6398                                     .s_dev = server->s_dev };
6399         struct nfs4_lock_waiter waiter = { .task  = current,
6400                                            .inode = state->inode,
6401                                            .owner = &owner,
6402                                            .notified = false };
6403         wait_queue_t wait;
6404
6405         /* Don't bother with waitqueue if we don't expect a callback */
6406         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
6407                 return nfs4_retry_setlk_simple(state, cmd, request);
6408
6409         init_wait(&wait);
6410         wait.private = &waiter;
6411         wait.func = nfs4_wake_lock_waiter;
6412         add_wait_queue(q, &wait);
6413
6414         while(!signalled()) {
6415                 status = nfs4_proc_setlk(state, cmd, request);
6416                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6417                         break;
6418
6419                 status = -ERESTARTSYS;
6420                 spin_lock_irqsave(&q->lock, flags);
6421                 if (waiter.notified) {
6422                         spin_unlock_irqrestore(&q->lock, flags);
6423                         continue;
6424                 }
6425                 set_current_state(TASK_INTERRUPTIBLE);
6426                 spin_unlock_irqrestore(&q->lock, flags);
6427
6428                 freezable_schedule_timeout_interruptible(NFS4_LOCK_MAXTIMEOUT);
6429         }
6430
6431         finish_wait(q, &wait);
6432         return status;
6433 }
6434 #else /* !CONFIG_NFS_V4_1 */
6435 static inline int
6436 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6437 {
6438         return nfs4_retry_setlk_simple(state, cmd, request);
6439 }
6440 #endif
6441
6442 static int
6443 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6444 {
6445         struct nfs_open_context *ctx;
6446         struct nfs4_state *state;
6447         int status;
6448
6449         /* verify open state */
6450         ctx = nfs_file_open_context(filp);
6451         state = ctx->state;
6452
6453         if (request->fl_start < 0 || request->fl_end < 0)
6454                 return -EINVAL;
6455
6456         if (IS_GETLK(cmd)) {
6457                 if (state != NULL)
6458                         return nfs4_proc_getlk(state, F_GETLK, request);
6459                 return 0;
6460         }
6461
6462         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6463                 return -EINVAL;
6464
6465         if (request->fl_type == F_UNLCK) {
6466                 if (state != NULL)
6467                         return nfs4_proc_unlck(state, cmd, request);
6468                 return 0;
6469         }
6470
6471         if (state == NULL)
6472                 return -ENOLCK;
6473
6474         if ((request->fl_flags & FL_POSIX) &&
6475             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6476                 return -ENOLCK;
6477
6478         /*
6479          * Don't rely on the VFS having checked the file open mode,
6480          * since it won't do this for flock() locks.
6481          */
6482         switch (request->fl_type) {
6483         case F_RDLCK:
6484                 if (!(filp->f_mode & FMODE_READ))
6485                         return -EBADF;
6486                 break;
6487         case F_WRLCK:
6488                 if (!(filp->f_mode & FMODE_WRITE))
6489                         return -EBADF;
6490         }
6491
6492         status = nfs4_set_lock_state(state, request);
6493         if (status != 0)
6494                 return status;
6495
6496         return nfs4_retry_setlk(state, cmd, request);
6497 }
6498
6499 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6500 {
6501         struct nfs_server *server = NFS_SERVER(state->inode);
6502         int err;
6503
6504         err = nfs4_set_lock_state(state, fl);
6505         if (err != 0)
6506                 return err;
6507         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6508         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6509 }
6510
6511 struct nfs_release_lockowner_data {
6512         struct nfs4_lock_state *lsp;
6513         struct nfs_server *server;
6514         struct nfs_release_lockowner_args args;
6515         struct nfs_release_lockowner_res res;
6516         unsigned long timestamp;
6517 };
6518
6519 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6520 {
6521         struct nfs_release_lockowner_data *data = calldata;
6522         struct nfs_server *server = data->server;
6523         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6524                              &data->args.seq_args, &data->res.seq_res, task);
6525         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6526         data->timestamp = jiffies;
6527 }
6528
6529 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6530 {
6531         struct nfs_release_lockowner_data *data = calldata;
6532         struct nfs_server *server = data->server;
6533
6534         nfs40_sequence_done(task, &data->res.seq_res);
6535
6536         switch (task->tk_status) {
6537         case 0:
6538                 renew_lease(server, data->timestamp);
6539                 break;
6540         case -NFS4ERR_STALE_CLIENTID:
6541         case -NFS4ERR_EXPIRED:
6542                 nfs4_schedule_lease_recovery(server->nfs_client);
6543                 break;
6544         case -NFS4ERR_LEASE_MOVED:
6545         case -NFS4ERR_DELAY:
6546                 if (nfs4_async_handle_error(task, server,
6547                                             NULL, NULL) == -EAGAIN)
6548                         rpc_restart_call_prepare(task);
6549         }
6550 }
6551
6552 static void nfs4_release_lockowner_release(void *calldata)
6553 {
6554         struct nfs_release_lockowner_data *data = calldata;
6555         nfs4_free_lock_state(data->server, data->lsp);
6556         kfree(calldata);
6557 }
6558
6559 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6560         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6561         .rpc_call_done = nfs4_release_lockowner_done,
6562         .rpc_release = nfs4_release_lockowner_release,
6563 };
6564
6565 static void
6566 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6567 {
6568         struct nfs_release_lockowner_data *data;
6569         struct rpc_message msg = {
6570                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6571         };
6572
6573         if (server->nfs_client->cl_mvops->minor_version != 0)
6574                 return;
6575
6576         data = kmalloc(sizeof(*data), GFP_NOFS);
6577         if (!data)
6578                 return;
6579         data->lsp = lsp;
6580         data->server = server;
6581         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6582         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6583         data->args.lock_owner.s_dev = server->s_dev;
6584
6585         msg.rpc_argp = &data->args;
6586         msg.rpc_resp = &data->res;
6587         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6588         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6589 }
6590
6591 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6592
6593 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6594                                    struct dentry *unused, struct inode *inode,
6595                                    const char *key, const void *buf,
6596                                    size_t buflen, int flags)
6597 {
6598         return nfs4_proc_set_acl(inode, buf, buflen);
6599 }
6600
6601 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6602                                    struct dentry *unused, struct inode *inode,
6603                                    const char *key, void *buf, size_t buflen)
6604 {
6605         return nfs4_proc_get_acl(inode, buf, buflen);
6606 }
6607
6608 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6609 {
6610         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6611 }
6612
6613 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6614
6615 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6616                                      struct dentry *unused, struct inode *inode,
6617                                      const char *key, const void *buf,
6618                                      size_t buflen, int flags)
6619 {
6620         if (security_ismaclabel(key))
6621                 return nfs4_set_security_label(inode, buf, buflen);
6622
6623         return -EOPNOTSUPP;
6624 }
6625
6626 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6627                                      struct dentry *unused, struct inode *inode,
6628                                      const char *key, void *buf, size_t buflen)
6629 {
6630         if (security_ismaclabel(key))
6631                 return nfs4_get_security_label(inode, buf, buflen);
6632         return -EOPNOTSUPP;
6633 }
6634
6635 static ssize_t
6636 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6637 {
6638         int len = 0;
6639
6640         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6641                 len = security_inode_listsecurity(inode, list, list_len);
6642                 if (list_len && len > list_len)
6643                         return -ERANGE;
6644         }
6645         return len;
6646 }
6647
6648 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6649         .prefix = XATTR_SECURITY_PREFIX,
6650         .get    = nfs4_xattr_get_nfs4_label,
6651         .set    = nfs4_xattr_set_nfs4_label,
6652 };
6653
6654 #else
6655
6656 static ssize_t
6657 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6658 {
6659         return 0;
6660 }
6661
6662 #endif
6663
6664 /*
6665  * nfs_fhget will use either the mounted_on_fileid or the fileid
6666  */
6667 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6668 {
6669         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6670                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6671               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6672               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6673                 return;
6674
6675         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6676                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6677         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6678         fattr->nlink = 2;
6679 }
6680
6681 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6682                                    const struct qstr *name,
6683                                    struct nfs4_fs_locations *fs_locations,
6684                                    struct page *page)
6685 {
6686         struct nfs_server *server = NFS_SERVER(dir);
6687         u32 bitmask[3] = {
6688                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6689         };
6690         struct nfs4_fs_locations_arg args = {
6691                 .dir_fh = NFS_FH(dir),
6692                 .name = name,
6693                 .page = page,
6694                 .bitmask = bitmask,
6695         };
6696         struct nfs4_fs_locations_res res = {
6697                 .fs_locations = fs_locations,
6698         };
6699         struct rpc_message msg = {
6700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6701                 .rpc_argp = &args,
6702                 .rpc_resp = &res,
6703         };
6704         int status;
6705
6706         dprintk("%s: start\n", __func__);
6707
6708         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6709          * is not supported */
6710         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6711                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6712         else
6713                 bitmask[0] |= FATTR4_WORD0_FILEID;
6714
6715         nfs_fattr_init(&fs_locations->fattr);
6716         fs_locations->server = server;
6717         fs_locations->nlocations = 0;
6718         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6719         dprintk("%s: returned status = %d\n", __func__, status);
6720         return status;
6721 }
6722
6723 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6724                            const struct qstr *name,
6725                            struct nfs4_fs_locations *fs_locations,
6726                            struct page *page)
6727 {
6728         struct nfs4_exception exception = { };
6729         int err;
6730         do {
6731                 err = _nfs4_proc_fs_locations(client, dir, name,
6732                                 fs_locations, page);
6733                 trace_nfs4_get_fs_locations(dir, name, err);
6734                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6735                                 &exception);
6736         } while (exception.retry);
6737         return err;
6738 }
6739
6740 /*
6741  * This operation also signals the server that this client is
6742  * performing migration recovery.  The server can stop returning
6743  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6744  * appended to this compound to identify the client ID which is
6745  * performing recovery.
6746  */
6747 static int _nfs40_proc_get_locations(struct inode *inode,
6748                                      struct nfs4_fs_locations *locations,
6749                                      struct page *page, struct rpc_cred *cred)
6750 {
6751         struct nfs_server *server = NFS_SERVER(inode);
6752         struct rpc_clnt *clnt = server->client;
6753         u32 bitmask[2] = {
6754                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6755         };
6756         struct nfs4_fs_locations_arg args = {
6757                 .clientid       = server->nfs_client->cl_clientid,
6758                 .fh             = NFS_FH(inode),
6759                 .page           = page,
6760                 .bitmask        = bitmask,
6761                 .migration      = 1,            /* skip LOOKUP */
6762                 .renew          = 1,            /* append RENEW */
6763         };
6764         struct nfs4_fs_locations_res res = {
6765                 .fs_locations   = locations,
6766                 .migration      = 1,
6767                 .renew          = 1,
6768         };
6769         struct rpc_message msg = {
6770                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6771                 .rpc_argp       = &args,
6772                 .rpc_resp       = &res,
6773                 .rpc_cred       = cred,
6774         };
6775         unsigned long now = jiffies;
6776         int status;
6777
6778         nfs_fattr_init(&locations->fattr);
6779         locations->server = server;
6780         locations->nlocations = 0;
6781
6782         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6783         nfs4_set_sequence_privileged(&args.seq_args);
6784         status = nfs4_call_sync_sequence(clnt, server, &msg,
6785                                         &args.seq_args, &res.seq_res);
6786         if (status)
6787                 return status;
6788
6789         renew_lease(server, now);
6790         return 0;
6791 }
6792
6793 #ifdef CONFIG_NFS_V4_1
6794
6795 /*
6796  * This operation also signals the server that this client is
6797  * performing migration recovery.  The server can stop asserting
6798  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6799  * performing this operation is identified in the SEQUENCE
6800  * operation in this compound.
6801  *
6802  * When the client supports GETATTR(fs_locations_info), it can
6803  * be plumbed in here.
6804  */
6805 static int _nfs41_proc_get_locations(struct inode *inode,
6806                                      struct nfs4_fs_locations *locations,
6807                                      struct page *page, struct rpc_cred *cred)
6808 {
6809         struct nfs_server *server = NFS_SERVER(inode);
6810         struct rpc_clnt *clnt = server->client;
6811         u32 bitmask[2] = {
6812                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6813         };
6814         struct nfs4_fs_locations_arg args = {
6815                 .fh             = NFS_FH(inode),
6816                 .page           = page,
6817                 .bitmask        = bitmask,
6818                 .migration      = 1,            /* skip LOOKUP */
6819         };
6820         struct nfs4_fs_locations_res res = {
6821                 .fs_locations   = locations,
6822                 .migration      = 1,
6823         };
6824         struct rpc_message msg = {
6825                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6826                 .rpc_argp       = &args,
6827                 .rpc_resp       = &res,
6828                 .rpc_cred       = cred,
6829         };
6830         int status;
6831
6832         nfs_fattr_init(&locations->fattr);
6833         locations->server = server;
6834         locations->nlocations = 0;
6835
6836         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6837         nfs4_set_sequence_privileged(&args.seq_args);
6838         status = nfs4_call_sync_sequence(clnt, server, &msg,
6839                                         &args.seq_args, &res.seq_res);
6840         if (status == NFS4_OK &&
6841             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6842                 status = -NFS4ERR_LEASE_MOVED;
6843         return status;
6844 }
6845
6846 #endif  /* CONFIG_NFS_V4_1 */
6847
6848 /**
6849  * nfs4_proc_get_locations - discover locations for a migrated FSID
6850  * @inode: inode on FSID that is migrating
6851  * @locations: result of query
6852  * @page: buffer
6853  * @cred: credential to use for this operation
6854  *
6855  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6856  * operation failed, or a negative errno if a local error occurred.
6857  *
6858  * On success, "locations" is filled in, but if the server has
6859  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6860  * asserted.
6861  *
6862  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6863  * from this client that require migration recovery.
6864  */
6865 int nfs4_proc_get_locations(struct inode *inode,
6866                             struct nfs4_fs_locations *locations,
6867                             struct page *page, struct rpc_cred *cred)
6868 {
6869         struct nfs_server *server = NFS_SERVER(inode);
6870         struct nfs_client *clp = server->nfs_client;
6871         const struct nfs4_mig_recovery_ops *ops =
6872                                         clp->cl_mvops->mig_recovery_ops;
6873         struct nfs4_exception exception = { };
6874         int status;
6875
6876         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6877                 (unsigned long long)server->fsid.major,
6878                 (unsigned long long)server->fsid.minor,
6879                 clp->cl_hostname);
6880         nfs_display_fhandle(NFS_FH(inode), __func__);
6881
6882         do {
6883                 status = ops->get_locations(inode, locations, page, cred);
6884                 if (status != -NFS4ERR_DELAY)
6885                         break;
6886                 nfs4_handle_exception(server, status, &exception);
6887         } while (exception.retry);
6888         return status;
6889 }
6890
6891 /*
6892  * This operation also signals the server that this client is
6893  * performing "lease moved" recovery.  The server can stop
6894  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6895  * is appended to this compound to identify the client ID which is
6896  * performing recovery.
6897  */
6898 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6899 {
6900         struct nfs_server *server = NFS_SERVER(inode);
6901         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6902         struct rpc_clnt *clnt = server->client;
6903         struct nfs4_fsid_present_arg args = {
6904                 .fh             = NFS_FH(inode),
6905                 .clientid       = clp->cl_clientid,
6906                 .renew          = 1,            /* append RENEW */
6907         };
6908         struct nfs4_fsid_present_res res = {
6909                 .renew          = 1,
6910         };
6911         struct rpc_message msg = {
6912                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6913                 .rpc_argp       = &args,
6914                 .rpc_resp       = &res,
6915                 .rpc_cred       = cred,
6916         };
6917         unsigned long now = jiffies;
6918         int status;
6919
6920         res.fh = nfs_alloc_fhandle();
6921         if (res.fh == NULL)
6922                 return -ENOMEM;
6923
6924         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6925         nfs4_set_sequence_privileged(&args.seq_args);
6926         status = nfs4_call_sync_sequence(clnt, server, &msg,
6927                                                 &args.seq_args, &res.seq_res);
6928         nfs_free_fhandle(res.fh);
6929         if (status)
6930                 return status;
6931
6932         do_renew_lease(clp, now);
6933         return 0;
6934 }
6935
6936 #ifdef CONFIG_NFS_V4_1
6937
6938 /*
6939  * This operation also signals the server that this client is
6940  * performing "lease moved" recovery.  The server can stop asserting
6941  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6942  * this operation is identified in the SEQUENCE operation in this
6943  * compound.
6944  */
6945 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6946 {
6947         struct nfs_server *server = NFS_SERVER(inode);
6948         struct rpc_clnt *clnt = server->client;
6949         struct nfs4_fsid_present_arg args = {
6950                 .fh             = NFS_FH(inode),
6951         };
6952         struct nfs4_fsid_present_res res = {
6953         };
6954         struct rpc_message msg = {
6955                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6956                 .rpc_argp       = &args,
6957                 .rpc_resp       = &res,
6958                 .rpc_cred       = cred,
6959         };
6960         int status;
6961
6962         res.fh = nfs_alloc_fhandle();
6963         if (res.fh == NULL)
6964                 return -ENOMEM;
6965
6966         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6967         nfs4_set_sequence_privileged(&args.seq_args);
6968         status = nfs4_call_sync_sequence(clnt, server, &msg,
6969                                                 &args.seq_args, &res.seq_res);
6970         nfs_free_fhandle(res.fh);
6971         if (status == NFS4_OK &&
6972             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6973                 status = -NFS4ERR_LEASE_MOVED;
6974         return status;
6975 }
6976
6977 #endif  /* CONFIG_NFS_V4_1 */
6978
6979 /**
6980  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6981  * @inode: inode on FSID to check
6982  * @cred: credential to use for this operation
6983  *
6984  * Server indicates whether the FSID is present, moved, or not
6985  * recognized.  This operation is necessary to clear a LEASE_MOVED
6986  * condition for this client ID.
6987  *
6988  * Returns NFS4_OK if the FSID is present on this server,
6989  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6990  *  NFS4ERR code if some error occurred on the server, or a
6991  *  negative errno if a local failure occurred.
6992  */
6993 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6994 {
6995         struct nfs_server *server = NFS_SERVER(inode);
6996         struct nfs_client *clp = server->nfs_client;
6997         const struct nfs4_mig_recovery_ops *ops =
6998                                         clp->cl_mvops->mig_recovery_ops;
6999         struct nfs4_exception exception = { };
7000         int status;
7001
7002         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7003                 (unsigned long long)server->fsid.major,
7004                 (unsigned long long)server->fsid.minor,
7005                 clp->cl_hostname);
7006         nfs_display_fhandle(NFS_FH(inode), __func__);
7007
7008         do {
7009                 status = ops->fsid_present(inode, cred);
7010                 if (status != -NFS4ERR_DELAY)
7011                         break;
7012                 nfs4_handle_exception(server, status, &exception);
7013         } while (exception.retry);
7014         return status;
7015 }
7016
7017 /**
7018  * If 'use_integrity' is true and the state managment nfs_client
7019  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
7020  * and the machine credential as per RFC3530bis and RFC5661 Security
7021  * Considerations sections. Otherwise, just use the user cred with the
7022  * filesystem's rpc_client.
7023  */
7024 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7025 {
7026         int status;
7027         struct nfs4_secinfo_arg args = {
7028                 .dir_fh = NFS_FH(dir),
7029                 .name   = name,
7030         };
7031         struct nfs4_secinfo_res res = {
7032                 .flavors     = flavors,
7033         };
7034         struct rpc_message msg = {
7035                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
7036                 .rpc_argp = &args,
7037                 .rpc_resp = &res,
7038         };
7039         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
7040         struct rpc_cred *cred = NULL;
7041
7042         if (use_integrity) {
7043                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
7044                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
7045                 msg.rpc_cred = cred;
7046         }
7047
7048         dprintk("NFS call  secinfo %s\n", name->name);
7049
7050         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
7051                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
7052
7053         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
7054                                 &res.seq_res, 0);
7055         dprintk("NFS reply  secinfo: %d\n", status);
7056
7057         if (cred)
7058                 put_rpccred(cred);
7059
7060         return status;
7061 }
7062
7063 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
7064                       struct nfs4_secinfo_flavors *flavors)
7065 {
7066         struct nfs4_exception exception = { };
7067         int err;
7068         do {
7069                 err = -NFS4ERR_WRONGSEC;
7070
7071                 /* try to use integrity protection with machine cred */
7072                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
7073                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
7074
7075                 /*
7076                  * if unable to use integrity protection, or SECINFO with
7077                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7078                  * disallowed by spec, but exists in deployed servers) use
7079                  * the current filesystem's rpc_client and the user cred.
7080                  */
7081                 if (err == -NFS4ERR_WRONGSEC)
7082                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
7083
7084                 trace_nfs4_secinfo(dir, name, err);
7085                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7086                                 &exception);
7087         } while (exception.retry);
7088         return err;
7089 }
7090
7091 #ifdef CONFIG_NFS_V4_1
7092 /*
7093  * Check the exchange flags returned by the server for invalid flags, having
7094  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
7095  * DS flags set.
7096  */
7097 static int nfs4_check_cl_exchange_flags(u32 flags)
7098 {
7099         if (flags & ~EXCHGID4_FLAG_MASK_R)
7100                 goto out_inval;
7101         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
7102             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
7103                 goto out_inval;
7104         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
7105                 goto out_inval;
7106         return NFS_OK;
7107 out_inval:
7108         return -NFS4ERR_INVAL;
7109 }
7110
7111 static bool
7112 nfs41_same_server_scope(struct nfs41_server_scope *a,
7113                         struct nfs41_server_scope *b)
7114 {
7115         if (a->server_scope_sz == b->server_scope_sz &&
7116             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
7117                 return true;
7118
7119         return false;
7120 }
7121
7122 static void
7123 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
7124 {
7125 }
7126
7127 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
7128         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
7129 };
7130
7131 /*
7132  * nfs4_proc_bind_one_conn_to_session()
7133  *
7134  * The 4.1 client currently uses the same TCP connection for the
7135  * fore and backchannel.
7136  */
7137 static
7138 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
7139                 struct rpc_xprt *xprt,
7140                 struct nfs_client *clp,
7141                 struct rpc_cred *cred)
7142 {
7143         int status;
7144         struct nfs41_bind_conn_to_session_args args = {
7145                 .client = clp,
7146                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
7147         };
7148         struct nfs41_bind_conn_to_session_res res;
7149         struct rpc_message msg = {
7150                 .rpc_proc =
7151                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
7152                 .rpc_argp = &args,
7153                 .rpc_resp = &res,
7154                 .rpc_cred = cred,
7155         };
7156         struct rpc_task_setup task_setup_data = {
7157                 .rpc_client = clnt,
7158                 .rpc_xprt = xprt,
7159                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
7160                 .rpc_message = &msg,
7161                 .flags = RPC_TASK_TIMEOUT,
7162         };
7163         struct rpc_task *task;
7164
7165         dprintk("--> %s\n", __func__);
7166
7167         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
7168         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
7169                 args.dir = NFS4_CDFC4_FORE;
7170
7171         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
7172         if (xprt != rcu_access_pointer(clnt->cl_xprt))
7173                 args.dir = NFS4_CDFC4_FORE;
7174
7175         task = rpc_run_task(&task_setup_data);
7176         if (!IS_ERR(task)) {
7177                 status = task->tk_status;
7178                 rpc_put_task(task);
7179         } else
7180                 status = PTR_ERR(task);
7181         trace_nfs4_bind_conn_to_session(clp, status);
7182         if (status == 0) {
7183                 if (memcmp(res.sessionid.data,
7184                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
7185                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
7186                         status = -EIO;
7187                         goto out;
7188                 }
7189                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
7190                         dprintk("NFS: %s: Unexpected direction from server\n",
7191                                 __func__);
7192                         status = -EIO;
7193                         goto out;
7194                 }
7195                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
7196                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
7197                                 __func__);
7198                         status = -EIO;
7199                         goto out;
7200                 }
7201         }
7202 out:
7203         dprintk("<-- %s status= %d\n", __func__, status);
7204         return status;
7205 }
7206
7207 struct rpc_bind_conn_calldata {
7208         struct nfs_client *clp;
7209         struct rpc_cred *cred;
7210 };
7211
7212 static int
7213 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
7214                 struct rpc_xprt *xprt,
7215                 void *calldata)
7216 {
7217         struct rpc_bind_conn_calldata *p = calldata;
7218
7219         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
7220 }
7221
7222 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
7223 {
7224         struct rpc_bind_conn_calldata data = {
7225                 .clp = clp,
7226                 .cred = cred,
7227         };
7228         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
7229                         nfs4_proc_bind_conn_to_session_callback, &data);
7230 }
7231
7232 /*
7233  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
7234  * and operations we'd like to see to enable certain features in the allow map
7235  */
7236 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
7237         .how = SP4_MACH_CRED,
7238         .enforce.u.words = {
7239                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7240                       1 << (OP_EXCHANGE_ID - 32) |
7241                       1 << (OP_CREATE_SESSION - 32) |
7242                       1 << (OP_DESTROY_SESSION - 32) |
7243                       1 << (OP_DESTROY_CLIENTID - 32)
7244         },
7245         .allow.u.words = {
7246                 [0] = 1 << (OP_CLOSE) |
7247                       1 << (OP_OPEN_DOWNGRADE) |
7248                       1 << (OP_LOCKU) |
7249                       1 << (OP_DELEGRETURN) |
7250                       1 << (OP_COMMIT),
7251                 [1] = 1 << (OP_SECINFO - 32) |
7252                       1 << (OP_SECINFO_NO_NAME - 32) |
7253                       1 << (OP_LAYOUTRETURN - 32) |
7254                       1 << (OP_TEST_STATEID - 32) |
7255                       1 << (OP_FREE_STATEID - 32) |
7256                       1 << (OP_WRITE - 32)
7257         }
7258 };
7259
7260 /*
7261  * Select the state protection mode for client `clp' given the server results
7262  * from exchange_id in `sp'.
7263  *
7264  * Returns 0 on success, negative errno otherwise.
7265  */
7266 static int nfs4_sp4_select_mode(struct nfs_client *clp,
7267                                  struct nfs41_state_protection *sp)
7268 {
7269         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
7270                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7271                       1 << (OP_EXCHANGE_ID - 32) |
7272                       1 << (OP_CREATE_SESSION - 32) |
7273                       1 << (OP_DESTROY_SESSION - 32) |
7274                       1 << (OP_DESTROY_CLIENTID - 32)
7275         };
7276         unsigned int i;
7277
7278         if (sp->how == SP4_MACH_CRED) {
7279                 /* Print state protect result */
7280                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
7281                 for (i = 0; i <= LAST_NFS4_OP; i++) {
7282                         if (test_bit(i, sp->enforce.u.longs))
7283                                 dfprintk(MOUNT, "  enforce op %d\n", i);
7284                         if (test_bit(i, sp->allow.u.longs))
7285                                 dfprintk(MOUNT, "  allow op %d\n", i);
7286                 }
7287
7288                 /* make sure nothing is on enforce list that isn't supported */
7289                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
7290                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
7291                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7292                                 return -EINVAL;
7293                         }
7294                 }
7295
7296                 /*
7297                  * Minimal mode - state operations are allowed to use machine
7298                  * credential.  Note this already happens by default, so the
7299                  * client doesn't have to do anything more than the negotiation.
7300                  *
7301                  * NOTE: we don't care if EXCHANGE_ID is in the list -
7302                  *       we're already using the machine cred for exchange_id
7303                  *       and will never use a different cred.
7304                  */
7305                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
7306                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
7307                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
7308                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
7309                         dfprintk(MOUNT, "sp4_mach_cred:\n");
7310                         dfprintk(MOUNT, "  minimal mode enabled\n");
7311                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
7312                 } else {
7313                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7314                         return -EINVAL;
7315                 }
7316
7317                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7318                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7319                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7320                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
7321                         dfprintk(MOUNT, "  cleanup mode enabled\n");
7322                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
7323                 }
7324
7325                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7326                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
7327                         set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
7328                                 &clp->cl_sp4_flags);
7329                 }
7330
7331                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7332                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7333                         dfprintk(MOUNT, "  secinfo mode enabled\n");
7334                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
7335                 }
7336
7337                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7338                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7339                         dfprintk(MOUNT, "  stateid mode enabled\n");
7340                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
7341                 }
7342
7343                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7344                         dfprintk(MOUNT, "  write mode enabled\n");
7345                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
7346                 }
7347
7348                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7349                         dfprintk(MOUNT, "  commit mode enabled\n");
7350                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
7351                 }
7352         }
7353
7354         return 0;
7355 }
7356
7357 struct nfs41_exchange_id_data {
7358         struct nfs41_exchange_id_res res;
7359         struct nfs41_exchange_id_args args;
7360         struct rpc_xprt *xprt;
7361         int rpc_status;
7362 };
7363
7364 static void nfs4_exchange_id_done(struct rpc_task *task, void *data)
7365 {
7366         struct nfs41_exchange_id_data *cdata =
7367                                         (struct nfs41_exchange_id_data *)data;
7368         struct nfs_client *clp = cdata->args.client;
7369         int status = task->tk_status;
7370
7371         trace_nfs4_exchange_id(clp, status);
7372
7373         if (status == 0)
7374                 status = nfs4_check_cl_exchange_flags(cdata->res.flags);
7375
7376         if (cdata->xprt && status == 0) {
7377                 status = nfs4_detect_session_trunking(clp, &cdata->res,
7378                                                       cdata->xprt);
7379                 goto out;
7380         }
7381
7382         if (status  == 0)
7383                 status = nfs4_sp4_select_mode(clp, &cdata->res.state_protect);
7384
7385         if (status == 0) {
7386                 clp->cl_clientid = cdata->res.clientid;
7387                 clp->cl_exchange_flags = cdata->res.flags;
7388                 /* Client ID is not confirmed */
7389                 if (!(cdata->res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7390                         clear_bit(NFS4_SESSION_ESTABLISHED,
7391                         &clp->cl_session->session_state);
7392                         clp->cl_seqid = cdata->res.seqid;
7393                 }
7394
7395                 kfree(clp->cl_serverowner);
7396                 clp->cl_serverowner = cdata->res.server_owner;
7397                 cdata->res.server_owner = NULL;
7398
7399                 /* use the most recent implementation id */
7400                 kfree(clp->cl_implid);
7401                 clp->cl_implid = cdata->res.impl_id;
7402                 cdata->res.impl_id = NULL;
7403
7404                 if (clp->cl_serverscope != NULL &&
7405                     !nfs41_same_server_scope(clp->cl_serverscope,
7406                                         cdata->res.server_scope)) {
7407                         dprintk("%s: server_scope mismatch detected\n",
7408                                 __func__);
7409                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7410                         kfree(clp->cl_serverscope);
7411                         clp->cl_serverscope = NULL;
7412                 }
7413
7414                 if (clp->cl_serverscope == NULL) {
7415                         clp->cl_serverscope = cdata->res.server_scope;
7416                         cdata->res.server_scope = NULL;
7417                 }
7418                 /* Save the EXCHANGE_ID verifier session trunk tests */
7419                 memcpy(clp->cl_confirm.data, cdata->args.verifier->data,
7420                        sizeof(clp->cl_confirm.data));
7421         }
7422 out:
7423         cdata->rpc_status = status;
7424         return;
7425 }
7426
7427 static void nfs4_exchange_id_release(void *data)
7428 {
7429         struct nfs41_exchange_id_data *cdata =
7430                                         (struct nfs41_exchange_id_data *)data;
7431
7432         nfs_put_client(cdata->args.client);
7433         if (cdata->xprt) {
7434                 xprt_put(cdata->xprt);
7435                 rpc_clnt_xprt_switch_put(cdata->args.client->cl_rpcclient);
7436         }
7437         kfree(cdata->res.impl_id);
7438         kfree(cdata->res.server_scope);
7439         kfree(cdata->res.server_owner);
7440         kfree(cdata);
7441 }
7442
7443 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
7444         .rpc_call_done = nfs4_exchange_id_done,
7445         .rpc_release = nfs4_exchange_id_release,
7446 };
7447
7448 /*
7449  * _nfs4_proc_exchange_id()
7450  *
7451  * Wrapper for EXCHANGE_ID operation.
7452  */
7453 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7454                         u32 sp4_how, struct rpc_xprt *xprt)
7455 {
7456         nfs4_verifier verifier;
7457         struct rpc_message msg = {
7458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7459                 .rpc_cred = cred,
7460         };
7461         struct rpc_task_setup task_setup_data = {
7462                 .rpc_client = clp->cl_rpcclient,
7463                 .callback_ops = &nfs4_exchange_id_call_ops,
7464                 .rpc_message = &msg,
7465                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7466         };
7467         struct nfs41_exchange_id_data *calldata;
7468         struct rpc_task *task;
7469         int status = -EIO;
7470
7471         if (!atomic_inc_not_zero(&clp->cl_count))
7472                 goto out;
7473
7474         status = -ENOMEM;
7475         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7476         if (!calldata)
7477                 goto out;
7478
7479         if (!xprt)
7480                 nfs4_init_boot_verifier(clp, &verifier);
7481
7482         status = nfs4_init_uniform_client_string(clp);
7483         if (status)
7484                 goto out_calldata;
7485
7486         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
7487                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
7488                 clp->cl_owner_id);
7489
7490         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
7491                                                 GFP_NOFS);
7492         status = -ENOMEM;
7493         if (unlikely(calldata->res.server_owner == NULL))
7494                 goto out_calldata;
7495
7496         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7497                                         GFP_NOFS);
7498         if (unlikely(calldata->res.server_scope == NULL))
7499                 goto out_server_owner;
7500
7501         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7502         if (unlikely(calldata->res.impl_id == NULL))
7503                 goto out_server_scope;
7504
7505         switch (sp4_how) {
7506         case SP4_NONE:
7507                 calldata->args.state_protect.how = SP4_NONE;
7508                 break;
7509
7510         case SP4_MACH_CRED:
7511                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
7512                 break;
7513
7514         default:
7515                 /* unsupported! */
7516                 WARN_ON_ONCE(1);
7517                 status = -EINVAL;
7518                 goto out_impl_id;
7519         }
7520         if (xprt) {
7521                 calldata->xprt = xprt;
7522                 task_setup_data.rpc_xprt = xprt;
7523                 task_setup_data.flags =
7524                                 RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC;
7525                 calldata->args.verifier = &clp->cl_confirm;
7526         } else {
7527                 calldata->args.verifier = &verifier;
7528         }
7529         calldata->args.client = clp;
7530 #ifdef CONFIG_NFS_V4_1_MIGRATION
7531         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7532         EXCHGID4_FLAG_BIND_PRINC_STATEID |
7533         EXCHGID4_FLAG_SUPP_MOVED_MIGR,
7534 #else
7535         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7536         EXCHGID4_FLAG_BIND_PRINC_STATEID,
7537 #endif
7538         msg.rpc_argp = &calldata->args;
7539         msg.rpc_resp = &calldata->res;
7540         task_setup_data.callback_data = calldata;
7541
7542         task = rpc_run_task(&task_setup_data);
7543         if (IS_ERR(task)) {
7544         status = PTR_ERR(task);
7545                 goto out_impl_id;
7546         }
7547
7548         if (!xprt) {
7549                 status = rpc_wait_for_completion_task(task);
7550                 if (!status)
7551                         status = calldata->rpc_status;
7552         } else  /* session trunking test */
7553                 status = calldata->rpc_status;
7554
7555         rpc_put_task(task);
7556 out:
7557         if (clp->cl_implid != NULL)
7558                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7559                         "domain: %s, name: %s, date: %llu,%u\n",
7560                         clp->cl_implid->domain, clp->cl_implid->name,
7561                         clp->cl_implid->date.seconds,
7562                         clp->cl_implid->date.nseconds);
7563         dprintk("NFS reply exchange_id: %d\n", status);
7564         return status;
7565
7566 out_impl_id:
7567         kfree(calldata->res.impl_id);
7568 out_server_scope:
7569         kfree(calldata->res.server_scope);
7570 out_server_owner:
7571         kfree(calldata->res.server_owner);
7572 out_calldata:
7573         kfree(calldata);
7574         goto out;
7575 }
7576
7577 /*
7578  * nfs4_proc_exchange_id()
7579  *
7580  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7581  *
7582  * Since the clientid has expired, all compounds using sessions
7583  * associated with the stale clientid will be returning
7584  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7585  * be in some phase of session reset.
7586  *
7587  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7588  */
7589 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7590 {
7591         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7592         int status;
7593
7594         /* try SP4_MACH_CRED if krb5i/p */
7595         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7596             authflavor == RPC_AUTH_GSS_KRB5P) {
7597                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED, NULL);
7598                 if (!status)
7599                         return 0;
7600         }
7601
7602         /* try SP4_NONE */
7603         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE, NULL);
7604 }
7605
7606 /**
7607  * nfs4_test_session_trunk
7608  *
7609  * This is an add_xprt_test() test function called from
7610  * rpc_clnt_setup_test_and_add_xprt.
7611  *
7612  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
7613  * and is dereferrenced in nfs4_exchange_id_release
7614  *
7615  * Upon success, add the new transport to the rpc_clnt
7616  *
7617  * @clnt: struct rpc_clnt to get new transport
7618  * @xprt: the rpc_xprt to test
7619  * @data: call data for _nfs4_proc_exchange_id.
7620  */
7621 int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
7622                             void *data)
7623 {
7624         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
7625         u32 sp4_how;
7626
7627         dprintk("--> %s try %s\n", __func__,
7628                 xprt->address_strings[RPC_DISPLAY_ADDR]);
7629
7630         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
7631
7632         /* Test connection for session trunking. Async exchange_id call */
7633         return  _nfs4_proc_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
7634 }
7635 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
7636
7637 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7638                 struct rpc_cred *cred)
7639 {
7640         struct rpc_message msg = {
7641                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7642                 .rpc_argp = clp,
7643                 .rpc_cred = cred,
7644         };
7645         int status;
7646
7647         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7648         trace_nfs4_destroy_clientid(clp, status);
7649         if (status)
7650                 dprintk("NFS: Got error %d from the server %s on "
7651                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7652         return status;
7653 }
7654
7655 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7656                 struct rpc_cred *cred)
7657 {
7658         unsigned int loop;
7659         int ret;
7660
7661         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7662                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7663                 switch (ret) {
7664                 case -NFS4ERR_DELAY:
7665                 case -NFS4ERR_CLIENTID_BUSY:
7666                         ssleep(1);
7667                         break;
7668                 default:
7669                         return ret;
7670                 }
7671         }
7672         return 0;
7673 }
7674
7675 int nfs4_destroy_clientid(struct nfs_client *clp)
7676 {
7677         struct rpc_cred *cred;
7678         int ret = 0;
7679
7680         if (clp->cl_mvops->minor_version < 1)
7681                 goto out;
7682         if (clp->cl_exchange_flags == 0)
7683                 goto out;
7684         if (clp->cl_preserve_clid)
7685                 goto out;
7686         cred = nfs4_get_clid_cred(clp);
7687         ret = nfs4_proc_destroy_clientid(clp, cred);
7688         if (cred)
7689                 put_rpccred(cred);
7690         switch (ret) {
7691         case 0:
7692         case -NFS4ERR_STALE_CLIENTID:
7693                 clp->cl_exchange_flags = 0;
7694         }
7695 out:
7696         return ret;
7697 }
7698
7699 struct nfs4_get_lease_time_data {
7700         struct nfs4_get_lease_time_args *args;
7701         struct nfs4_get_lease_time_res *res;
7702         struct nfs_client *clp;
7703 };
7704
7705 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7706                                         void *calldata)
7707 {
7708         struct nfs4_get_lease_time_data *data =
7709                         (struct nfs4_get_lease_time_data *)calldata;
7710
7711         dprintk("--> %s\n", __func__);
7712         /* just setup sequence, do not trigger session recovery
7713            since we're invoked within one */
7714         nfs41_setup_sequence(data->clp->cl_session,
7715                         &data->args->la_seq_args,
7716                         &data->res->lr_seq_res,
7717                         task);
7718         dprintk("<-- %s\n", __func__);
7719 }
7720
7721 /*
7722  * Called from nfs4_state_manager thread for session setup, so don't recover
7723  * from sequence operation or clientid errors.
7724  */
7725 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7726 {
7727         struct nfs4_get_lease_time_data *data =
7728                         (struct nfs4_get_lease_time_data *)calldata;
7729
7730         dprintk("--> %s\n", __func__);
7731         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7732                 return;
7733         switch (task->tk_status) {
7734         case -NFS4ERR_DELAY:
7735         case -NFS4ERR_GRACE:
7736                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7737                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7738                 task->tk_status = 0;
7739                 /* fall through */
7740         case -NFS4ERR_RETRY_UNCACHED_REP:
7741                 rpc_restart_call_prepare(task);
7742                 return;
7743         }
7744         dprintk("<-- %s\n", __func__);
7745 }
7746
7747 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7748         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7749         .rpc_call_done = nfs4_get_lease_time_done,
7750 };
7751
7752 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7753 {
7754         struct rpc_task *task;
7755         struct nfs4_get_lease_time_args args;
7756         struct nfs4_get_lease_time_res res = {
7757                 .lr_fsinfo = fsinfo,
7758         };
7759         struct nfs4_get_lease_time_data data = {
7760                 .args = &args,
7761                 .res = &res,
7762                 .clp = clp,
7763         };
7764         struct rpc_message msg = {
7765                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7766                 .rpc_argp = &args,
7767                 .rpc_resp = &res,
7768         };
7769         struct rpc_task_setup task_setup = {
7770                 .rpc_client = clp->cl_rpcclient,
7771                 .rpc_message = &msg,
7772                 .callback_ops = &nfs4_get_lease_time_ops,
7773                 .callback_data = &data,
7774                 .flags = RPC_TASK_TIMEOUT,
7775         };
7776         int status;
7777
7778         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7779         nfs4_set_sequence_privileged(&args.la_seq_args);
7780         dprintk("--> %s\n", __func__);
7781         task = rpc_run_task(&task_setup);
7782
7783         if (IS_ERR(task))
7784                 status = PTR_ERR(task);
7785         else {
7786                 status = task->tk_status;
7787                 rpc_put_task(task);
7788         }
7789         dprintk("<-- %s return %d\n", __func__, status);
7790
7791         return status;
7792 }
7793
7794 /*
7795  * Initialize the values to be used by the client in CREATE_SESSION
7796  * If nfs4_init_session set the fore channel request and response sizes,
7797  * use them.
7798  *
7799  * Set the back channel max_resp_sz_cached to zero to force the client to
7800  * always set csa_cachethis to FALSE because the current implementation
7801  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7802  */
7803 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
7804                                     struct rpc_clnt *clnt)
7805 {
7806         unsigned int max_rqst_sz, max_resp_sz;
7807         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
7808
7809         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7810         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7811
7812         /* Fore channel attributes */
7813         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7814         args->fc_attrs.max_resp_sz = max_resp_sz;
7815         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7816         args->fc_attrs.max_reqs = max_session_slots;
7817
7818         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7819                 "max_ops=%u max_reqs=%u\n",
7820                 __func__,
7821                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7822                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7823
7824         /* Back channel attributes */
7825         args->bc_attrs.max_rqst_sz = max_bc_payload;
7826         args->bc_attrs.max_resp_sz = max_bc_payload;
7827         args->bc_attrs.max_resp_sz_cached = 0;
7828         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7829         args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1);
7830
7831         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7832                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7833                 __func__,
7834                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7835                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7836                 args->bc_attrs.max_reqs);
7837 }
7838
7839 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7840                 struct nfs41_create_session_res *res)
7841 {
7842         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7843         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7844
7845         if (rcvd->max_resp_sz > sent->max_resp_sz)
7846                 return -EINVAL;
7847         /*
7848          * Our requested max_ops is the minimum we need; we're not
7849          * prepared to break up compounds into smaller pieces than that.
7850          * So, no point even trying to continue if the server won't
7851          * cooperate:
7852          */
7853         if (rcvd->max_ops < sent->max_ops)
7854                 return -EINVAL;
7855         if (rcvd->max_reqs == 0)
7856                 return -EINVAL;
7857         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7858                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7859         return 0;
7860 }
7861
7862 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7863                 struct nfs41_create_session_res *res)
7864 {
7865         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7866         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7867
7868         if (!(res->flags & SESSION4_BACK_CHAN))
7869                 goto out;
7870         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7871                 return -EINVAL;
7872         if (rcvd->max_resp_sz < sent->max_resp_sz)
7873                 return -EINVAL;
7874         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7875                 return -EINVAL;
7876         if (rcvd->max_ops > sent->max_ops)
7877                 return -EINVAL;
7878         if (rcvd->max_reqs > sent->max_reqs)
7879                 return -EINVAL;
7880 out:
7881         return 0;
7882 }
7883
7884 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7885                                      struct nfs41_create_session_res *res)
7886 {
7887         int ret;
7888
7889         ret = nfs4_verify_fore_channel_attrs(args, res);
7890         if (ret)
7891                 return ret;
7892         return nfs4_verify_back_channel_attrs(args, res);
7893 }
7894
7895 static void nfs4_update_session(struct nfs4_session *session,
7896                 struct nfs41_create_session_res *res)
7897 {
7898         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7899         /* Mark client id and session as being confirmed */
7900         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7901         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7902         session->flags = res->flags;
7903         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7904         if (res->flags & SESSION4_BACK_CHAN)
7905                 memcpy(&session->bc_attrs, &res->bc_attrs,
7906                                 sizeof(session->bc_attrs));
7907 }
7908
7909 static int _nfs4_proc_create_session(struct nfs_client *clp,
7910                 struct rpc_cred *cred)
7911 {
7912         struct nfs4_session *session = clp->cl_session;
7913         struct nfs41_create_session_args args = {
7914                 .client = clp,
7915                 .clientid = clp->cl_clientid,
7916                 .seqid = clp->cl_seqid,
7917                 .cb_program = NFS4_CALLBACK,
7918         };
7919         struct nfs41_create_session_res res;
7920
7921         struct rpc_message msg = {
7922                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7923                 .rpc_argp = &args,
7924                 .rpc_resp = &res,
7925                 .rpc_cred = cred,
7926         };
7927         int status;
7928
7929         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
7930         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7931
7932         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7933         trace_nfs4_create_session(clp, status);
7934
7935         switch (status) {
7936         case -NFS4ERR_STALE_CLIENTID:
7937         case -NFS4ERR_DELAY:
7938         case -ETIMEDOUT:
7939         case -EACCES:
7940         case -EAGAIN:
7941                 goto out;
7942         };
7943
7944         clp->cl_seqid++;
7945         if (!status) {
7946                 /* Verify the session's negotiated channel_attrs values */
7947                 status = nfs4_verify_channel_attrs(&args, &res);
7948                 /* Increment the clientid slot sequence id */
7949                 if (status)
7950                         goto out;
7951                 nfs4_update_session(session, &res);
7952         }
7953 out:
7954         return status;
7955 }
7956
7957 /*
7958  * Issues a CREATE_SESSION operation to the server.
7959  * It is the responsibility of the caller to verify the session is
7960  * expired before calling this routine.
7961  */
7962 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7963 {
7964         int status;
7965         unsigned *ptr;
7966         struct nfs4_session *session = clp->cl_session;
7967
7968         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7969
7970         status = _nfs4_proc_create_session(clp, cred);
7971         if (status)
7972                 goto out;
7973
7974         /* Init or reset the session slot tables */
7975         status = nfs4_setup_session_slot_tables(session);
7976         dprintk("slot table setup returned %d\n", status);
7977         if (status)
7978                 goto out;
7979
7980         ptr = (unsigned *)&session->sess_id.data[0];
7981         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7982                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7983 out:
7984         dprintk("<-- %s\n", __func__);
7985         return status;
7986 }
7987
7988 /*
7989  * Issue the over-the-wire RPC DESTROY_SESSION.
7990  * The caller must serialize access to this routine.
7991  */
7992 int nfs4_proc_destroy_session(struct nfs4_session *session,
7993                 struct rpc_cred *cred)
7994 {
7995         struct rpc_message msg = {
7996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7997                 .rpc_argp = session,
7998                 .rpc_cred = cred,
7999         };
8000         int status = 0;
8001
8002         dprintk("--> nfs4_proc_destroy_session\n");
8003
8004         /* session is still being setup */
8005         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
8006                 return 0;
8007
8008         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
8009         trace_nfs4_destroy_session(session->clp, status);
8010
8011         if (status)
8012                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
8013                         "Session has been destroyed regardless...\n", status);
8014
8015         dprintk("<-- nfs4_proc_destroy_session\n");
8016         return status;
8017 }
8018
8019 /*
8020  * Renew the cl_session lease.
8021  */
8022 struct nfs4_sequence_data {
8023         struct nfs_client *clp;
8024         struct nfs4_sequence_args args;
8025         struct nfs4_sequence_res res;
8026 };
8027
8028 static void nfs41_sequence_release(void *data)
8029 {
8030         struct nfs4_sequence_data *calldata = data;
8031         struct nfs_client *clp = calldata->clp;
8032
8033         if (atomic_read(&clp->cl_count) > 1)
8034                 nfs4_schedule_state_renewal(clp);
8035         nfs_put_client(clp);
8036         kfree(calldata);
8037 }
8038
8039 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8040 {
8041         switch(task->tk_status) {
8042         case -NFS4ERR_DELAY:
8043                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8044                 return -EAGAIN;
8045         default:
8046                 nfs4_schedule_lease_recovery(clp);
8047         }
8048         return 0;
8049 }
8050
8051 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
8052 {
8053         struct nfs4_sequence_data *calldata = data;
8054         struct nfs_client *clp = calldata->clp;
8055
8056         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
8057                 return;
8058
8059         trace_nfs4_sequence(clp, task->tk_status);
8060         if (task->tk_status < 0) {
8061                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
8062                 if (atomic_read(&clp->cl_count) == 1)
8063                         goto out;
8064
8065                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
8066                         rpc_restart_call_prepare(task);
8067                         return;
8068                 }
8069         }
8070         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
8071 out:
8072         dprintk("<-- %s\n", __func__);
8073 }
8074
8075 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
8076 {
8077         struct nfs4_sequence_data *calldata = data;
8078         struct nfs_client *clp = calldata->clp;
8079         struct nfs4_sequence_args *args;
8080         struct nfs4_sequence_res *res;
8081
8082         args = task->tk_msg.rpc_argp;
8083         res = task->tk_msg.rpc_resp;
8084
8085         nfs41_setup_sequence(clp->cl_session, args, res, task);
8086 }
8087
8088 static const struct rpc_call_ops nfs41_sequence_ops = {
8089         .rpc_call_done = nfs41_sequence_call_done,
8090         .rpc_call_prepare = nfs41_sequence_prepare,
8091         .rpc_release = nfs41_sequence_release,
8092 };
8093
8094 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
8095                 struct rpc_cred *cred,
8096                 bool is_privileged)
8097 {
8098         struct nfs4_sequence_data *calldata;
8099         struct rpc_message msg = {
8100                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
8101                 .rpc_cred = cred,
8102         };
8103         struct rpc_task_setup task_setup_data = {
8104                 .rpc_client = clp->cl_rpcclient,
8105                 .rpc_message = &msg,
8106                 .callback_ops = &nfs41_sequence_ops,
8107                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
8108         };
8109
8110         if (!atomic_inc_not_zero(&clp->cl_count))
8111                 return ERR_PTR(-EIO);
8112         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8113         if (calldata == NULL) {
8114                 nfs_put_client(clp);
8115                 return ERR_PTR(-ENOMEM);
8116         }
8117         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
8118         if (is_privileged)
8119                 nfs4_set_sequence_privileged(&calldata->args);
8120         msg.rpc_argp = &calldata->args;
8121         msg.rpc_resp = &calldata->res;
8122         calldata->clp = clp;
8123         task_setup_data.callback_data = calldata;
8124
8125         return rpc_run_task(&task_setup_data);
8126 }
8127
8128 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
8129 {
8130         struct rpc_task *task;
8131         int ret = 0;
8132
8133         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
8134                 return -EAGAIN;
8135         task = _nfs41_proc_sequence(clp, cred, false);
8136         if (IS_ERR(task))
8137                 ret = PTR_ERR(task);
8138         else
8139                 rpc_put_task_async(task);
8140         dprintk("<-- %s status=%d\n", __func__, ret);
8141         return ret;
8142 }
8143
8144 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
8145 {
8146         struct rpc_task *task;
8147         int ret;
8148
8149         task = _nfs41_proc_sequence(clp, cred, true);
8150         if (IS_ERR(task)) {
8151                 ret = PTR_ERR(task);
8152                 goto out;
8153         }
8154         ret = rpc_wait_for_completion_task(task);
8155         if (!ret)
8156                 ret = task->tk_status;
8157         rpc_put_task(task);
8158 out:
8159         dprintk("<-- %s status=%d\n", __func__, ret);
8160         return ret;
8161 }
8162
8163 struct nfs4_reclaim_complete_data {
8164         struct nfs_client *clp;
8165         struct nfs41_reclaim_complete_args arg;
8166         struct nfs41_reclaim_complete_res res;
8167 };
8168
8169 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
8170 {
8171         struct nfs4_reclaim_complete_data *calldata = data;
8172
8173         nfs41_setup_sequence(calldata->clp->cl_session,
8174                         &calldata->arg.seq_args,
8175                         &calldata->res.seq_res,
8176                         task);
8177 }
8178
8179 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8180 {
8181         switch(task->tk_status) {
8182         case 0:
8183         case -NFS4ERR_COMPLETE_ALREADY:
8184         case -NFS4ERR_WRONG_CRED: /* What to do here? */
8185                 break;
8186         case -NFS4ERR_DELAY:
8187                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8188                 /* fall through */
8189         case -NFS4ERR_RETRY_UNCACHED_REP:
8190                 return -EAGAIN;
8191         default:
8192                 nfs4_schedule_lease_recovery(clp);
8193         }
8194         return 0;
8195 }
8196
8197 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
8198 {
8199         struct nfs4_reclaim_complete_data *calldata = data;
8200         struct nfs_client *clp = calldata->clp;
8201         struct nfs4_sequence_res *res = &calldata->res.seq_res;
8202
8203         dprintk("--> %s\n", __func__);
8204         if (!nfs41_sequence_done(task, res))
8205                 return;
8206
8207         trace_nfs4_reclaim_complete(clp, task->tk_status);
8208         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
8209                 rpc_restart_call_prepare(task);
8210                 return;
8211         }
8212         dprintk("<-- %s\n", __func__);
8213 }
8214
8215 static void nfs4_free_reclaim_complete_data(void *data)
8216 {
8217         struct nfs4_reclaim_complete_data *calldata = data;
8218
8219         kfree(calldata);
8220 }
8221
8222 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
8223         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
8224         .rpc_call_done = nfs4_reclaim_complete_done,
8225         .rpc_release = nfs4_free_reclaim_complete_data,
8226 };
8227
8228 /*
8229  * Issue a global reclaim complete.
8230  */
8231 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
8232                 struct rpc_cred *cred)
8233 {
8234         struct nfs4_reclaim_complete_data *calldata;
8235         struct rpc_task *task;
8236         struct rpc_message msg = {
8237                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
8238                 .rpc_cred = cred,
8239         };
8240         struct rpc_task_setup task_setup_data = {
8241                 .rpc_client = clp->cl_rpcclient,
8242                 .rpc_message = &msg,
8243                 .callback_ops = &nfs4_reclaim_complete_call_ops,
8244                 .flags = RPC_TASK_ASYNC,
8245         };
8246         int status = -ENOMEM;
8247
8248         dprintk("--> %s\n", __func__);
8249         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8250         if (calldata == NULL)
8251                 goto out;
8252         calldata->clp = clp;
8253         calldata->arg.one_fs = 0;
8254
8255         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
8256         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
8257         msg.rpc_argp = &calldata->arg;
8258         msg.rpc_resp = &calldata->res;
8259         task_setup_data.callback_data = calldata;
8260         task = rpc_run_task(&task_setup_data);
8261         if (IS_ERR(task)) {
8262                 status = PTR_ERR(task);
8263                 goto out;
8264         }
8265         status = nfs4_wait_for_completion_rpc_task(task);
8266         if (status == 0)
8267                 status = task->tk_status;
8268         rpc_put_task(task);
8269         return 0;
8270 out:
8271         dprintk("<-- %s status=%d\n", __func__, status);
8272         return status;
8273 }
8274
8275 static void
8276 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
8277 {
8278         struct nfs4_layoutget *lgp = calldata;
8279         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
8280         struct nfs4_session *session = nfs4_get_session(server);
8281
8282         dprintk("--> %s\n", __func__);
8283         nfs41_setup_sequence(session, &lgp->args.seq_args,
8284                                 &lgp->res.seq_res, task);
8285         dprintk("<-- %s\n", __func__);
8286 }
8287
8288 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
8289 {
8290         struct nfs4_layoutget *lgp = calldata;
8291
8292         dprintk("--> %s\n", __func__);
8293         nfs41_sequence_process(task, &lgp->res.seq_res);
8294         dprintk("<-- %s\n", __func__);
8295 }
8296
8297 static int
8298 nfs4_layoutget_handle_exception(struct rpc_task *task,
8299                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
8300 {
8301         struct inode *inode = lgp->args.inode;
8302         struct nfs_server *server = NFS_SERVER(inode);
8303         struct pnfs_layout_hdr *lo;
8304         int nfs4err = task->tk_status;
8305         int err, status = 0;
8306         LIST_HEAD(head);
8307
8308         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
8309
8310         switch (nfs4err) {
8311         case 0:
8312                 goto out;
8313
8314         /*
8315          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
8316          * on the file. set tk_status to -ENODATA to tell upper layer to
8317          * retry go inband.
8318          */
8319         case -NFS4ERR_LAYOUTUNAVAILABLE:
8320                 status = -ENODATA;
8321                 goto out;
8322         /*
8323          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
8324          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
8325          */
8326         case -NFS4ERR_BADLAYOUT:
8327                 status = -EOVERFLOW;
8328                 goto out;
8329         /*
8330          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
8331          * (or clients) writing to the same RAID stripe except when
8332          * the minlength argument is 0 (see RFC5661 section 18.43.3).
8333          *
8334          * Treat it like we would RECALLCONFLICT -- we retry for a little
8335          * while, and then eventually give up.
8336          */
8337         case -NFS4ERR_LAYOUTTRYLATER:
8338                 if (lgp->args.minlength == 0) {
8339                         status = -EOVERFLOW;
8340                         goto out;
8341                 }
8342                 status = -EBUSY;
8343                 break;
8344         case -NFS4ERR_RECALLCONFLICT:
8345                 status = -ERECALLCONFLICT;
8346                 break;
8347         case -NFS4ERR_DELEG_REVOKED:
8348         case -NFS4ERR_ADMIN_REVOKED:
8349         case -NFS4ERR_EXPIRED:
8350         case -NFS4ERR_BAD_STATEID:
8351                 exception->timeout = 0;
8352                 spin_lock(&inode->i_lock);
8353                 lo = NFS_I(inode)->layout;
8354                 /* If the open stateid was bad, then recover it. */
8355                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
8356                     nfs4_stateid_match_other(&lgp->args.stateid,
8357                                         &lgp->args.ctx->state->stateid)) {
8358                         spin_unlock(&inode->i_lock);
8359                         exception->state = lgp->args.ctx->state;
8360                         exception->stateid = &lgp->args.stateid;
8361                         break;
8362                 }
8363
8364                 /*
8365                  * Mark the bad layout state as invalid, then retry
8366                  */
8367                 pnfs_mark_layout_stateid_invalid(lo, &head);
8368                 spin_unlock(&inode->i_lock);
8369                 pnfs_free_lseg_list(&head);
8370                 status = -EAGAIN;
8371                 goto out;
8372         }
8373
8374         err = nfs4_handle_exception(server, nfs4err, exception);
8375         if (!status) {
8376                 if (exception->retry)
8377                         status = -EAGAIN;
8378                 else
8379                         status = err;
8380         }
8381 out:
8382         dprintk("<-- %s\n", __func__);
8383         return status;
8384 }
8385
8386 static size_t max_response_pages(struct nfs_server *server)
8387 {
8388         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
8389         return nfs_page_array_len(0, max_resp_sz);
8390 }
8391
8392 static void nfs4_free_pages(struct page **pages, size_t size)
8393 {
8394         int i;
8395
8396         if (!pages)
8397                 return;
8398
8399         for (i = 0; i < size; i++) {
8400                 if (!pages[i])
8401                         break;
8402                 __free_page(pages[i]);
8403         }
8404         kfree(pages);
8405 }
8406
8407 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
8408 {
8409         struct page **pages;
8410         int i;
8411
8412         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
8413         if (!pages) {
8414                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
8415                 return NULL;
8416         }
8417
8418         for (i = 0; i < size; i++) {
8419                 pages[i] = alloc_page(gfp_flags);
8420                 if (!pages[i]) {
8421                         dprintk("%s: failed to allocate page\n", __func__);
8422                         nfs4_free_pages(pages, size);
8423                         return NULL;
8424                 }
8425         }
8426
8427         return pages;
8428 }
8429
8430 static void nfs4_layoutget_release(void *calldata)
8431 {
8432         struct nfs4_layoutget *lgp = calldata;
8433         struct inode *inode = lgp->args.inode;
8434         struct nfs_server *server = NFS_SERVER(inode);
8435         size_t max_pages = max_response_pages(server);
8436
8437         dprintk("--> %s\n", __func__);
8438         nfs4_free_pages(lgp->args.layout.pages, max_pages);
8439         pnfs_put_layout_hdr(NFS_I(inode)->layout);
8440         put_nfs_open_context(lgp->args.ctx);
8441         kfree(calldata);
8442         dprintk("<-- %s\n", __func__);
8443 }
8444
8445 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
8446         .rpc_call_prepare = nfs4_layoutget_prepare,
8447         .rpc_call_done = nfs4_layoutget_done,
8448         .rpc_release = nfs4_layoutget_release,
8449 };
8450
8451 struct pnfs_layout_segment *
8452 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags)
8453 {
8454         struct inode *inode = lgp->args.inode;
8455         struct nfs_server *server = NFS_SERVER(inode);
8456         size_t max_pages = max_response_pages(server);
8457         struct rpc_task *task;
8458         struct rpc_message msg = {
8459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
8460                 .rpc_argp = &lgp->args,
8461                 .rpc_resp = &lgp->res,
8462                 .rpc_cred = lgp->cred,
8463         };
8464         struct rpc_task_setup task_setup_data = {
8465                 .rpc_client = server->client,
8466                 .rpc_message = &msg,
8467                 .callback_ops = &nfs4_layoutget_call_ops,
8468                 .callback_data = lgp,
8469                 .flags = RPC_TASK_ASYNC,
8470         };
8471         struct pnfs_layout_segment *lseg = NULL;
8472         struct nfs4_exception exception = {
8473                 .inode = inode,
8474                 .timeout = *timeout,
8475         };
8476         int status = 0;
8477
8478         dprintk("--> %s\n", __func__);
8479
8480         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
8481         pnfs_get_layout_hdr(NFS_I(inode)->layout);
8482
8483         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
8484         if (!lgp->args.layout.pages) {
8485                 nfs4_layoutget_release(lgp);
8486                 return ERR_PTR(-ENOMEM);
8487         }
8488         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
8489
8490         lgp->res.layoutp = &lgp->args.layout;
8491         lgp->res.seq_res.sr_slot = NULL;
8492         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
8493
8494         task = rpc_run_task(&task_setup_data);
8495         if (IS_ERR(task))
8496                 return ERR_CAST(task);
8497         status = nfs4_wait_for_completion_rpc_task(task);
8498         if (status == 0) {
8499                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
8500                 *timeout = exception.timeout;
8501         }
8502
8503         trace_nfs4_layoutget(lgp->args.ctx,
8504                         &lgp->args.range,
8505                         &lgp->res.range,
8506                         &lgp->res.stateid,
8507                         status);
8508
8509         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8510         if (status == 0 && lgp->res.layoutp->len)
8511                 lseg = pnfs_layout_process(lgp);
8512         nfs4_sequence_free_slot(&lgp->res.seq_res);
8513         rpc_put_task(task);
8514         dprintk("<-- %s status=%d\n", __func__, status);
8515         if (status)
8516                 return ERR_PTR(status);
8517         return lseg;
8518 }
8519
8520 static void
8521 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8522 {
8523         struct nfs4_layoutreturn *lrp = calldata;
8524
8525         dprintk("--> %s\n", __func__);
8526         nfs41_setup_sequence(lrp->clp->cl_session,
8527                         &lrp->args.seq_args,
8528                         &lrp->res.seq_res,
8529                         task);
8530 }
8531
8532 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8533 {
8534         struct nfs4_layoutreturn *lrp = calldata;
8535         struct nfs_server *server;
8536
8537         dprintk("--> %s\n", __func__);
8538
8539         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
8540                 return;
8541
8542         server = NFS_SERVER(lrp->args.inode);
8543         switch (task->tk_status) {
8544         default:
8545                 task->tk_status = 0;
8546         case 0:
8547                 break;
8548         case -NFS4ERR_DELAY:
8549                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8550                         break;
8551                 nfs4_sequence_free_slot(&lrp->res.seq_res);
8552                 rpc_restart_call_prepare(task);
8553                 return;
8554         }
8555         dprintk("<-- %s\n", __func__);
8556 }
8557
8558 static void nfs4_layoutreturn_release(void *calldata)
8559 {
8560         struct nfs4_layoutreturn *lrp = calldata;
8561         struct pnfs_layout_hdr *lo = lrp->args.layout;
8562         LIST_HEAD(freeme);
8563
8564         dprintk("--> %s\n", __func__);
8565         spin_lock(&lo->plh_inode->i_lock);
8566         if (lrp->res.lrs_present) {
8567                 pnfs_mark_matching_lsegs_invalid(lo, &freeme,
8568                                 &lrp->args.range,
8569                                 be32_to_cpu(lrp->args.stateid.seqid));
8570                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8571         } else
8572                 pnfs_mark_layout_stateid_invalid(lo, &freeme);
8573         pnfs_clear_layoutreturn_waitbit(lo);
8574         spin_unlock(&lo->plh_inode->i_lock);
8575         nfs4_sequence_free_slot(&lrp->res.seq_res);
8576         pnfs_free_lseg_list(&freeme);
8577         pnfs_put_layout_hdr(lrp->args.layout);
8578         nfs_iput_and_deactive(lrp->inode);
8579         kfree(calldata);
8580         dprintk("<-- %s\n", __func__);
8581 }
8582
8583 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8584         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8585         .rpc_call_done = nfs4_layoutreturn_done,
8586         .rpc_release = nfs4_layoutreturn_release,
8587 };
8588
8589 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8590 {
8591         struct rpc_task *task;
8592         struct rpc_message msg = {
8593                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8594                 .rpc_argp = &lrp->args,
8595                 .rpc_resp = &lrp->res,
8596                 .rpc_cred = lrp->cred,
8597         };
8598         struct rpc_task_setup task_setup_data = {
8599                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8600                 .rpc_message = &msg,
8601                 .callback_ops = &nfs4_layoutreturn_call_ops,
8602                 .callback_data = lrp,
8603         };
8604         int status = 0;
8605
8606         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8607                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8608                         &task_setup_data.rpc_client, &msg);
8609
8610         dprintk("--> %s\n", __func__);
8611         if (!sync) {
8612                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8613                 if (!lrp->inode) {
8614                         nfs4_layoutreturn_release(lrp);
8615                         return -EAGAIN;
8616                 }
8617                 task_setup_data.flags |= RPC_TASK_ASYNC;
8618         }
8619         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8620         task = rpc_run_task(&task_setup_data);
8621         if (IS_ERR(task))
8622                 return PTR_ERR(task);
8623         if (sync)
8624                 status = task->tk_status;
8625         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8626         dprintk("<-- %s status=%d\n", __func__, status);
8627         rpc_put_task(task);
8628         return status;
8629 }
8630
8631 static int
8632 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8633                 struct pnfs_device *pdev,
8634                 struct rpc_cred *cred)
8635 {
8636         struct nfs4_getdeviceinfo_args args = {
8637                 .pdev = pdev,
8638                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8639                         NOTIFY_DEVICEID4_DELETE,
8640         };
8641         struct nfs4_getdeviceinfo_res res = {
8642                 .pdev = pdev,
8643         };
8644         struct rpc_message msg = {
8645                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8646                 .rpc_argp = &args,
8647                 .rpc_resp = &res,
8648                 .rpc_cred = cred,
8649         };
8650         int status;
8651
8652         dprintk("--> %s\n", __func__);
8653         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8654         if (res.notification & ~args.notify_types)
8655                 dprintk("%s: unsupported notification\n", __func__);
8656         if (res.notification != args.notify_types)
8657                 pdev->nocache = 1;
8658
8659         dprintk("<-- %s status=%d\n", __func__, status);
8660
8661         return status;
8662 }
8663
8664 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8665                 struct pnfs_device *pdev,
8666                 struct rpc_cred *cred)
8667 {
8668         struct nfs4_exception exception = { };
8669         int err;
8670
8671         do {
8672                 err = nfs4_handle_exception(server,
8673                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8674                                         &exception);
8675         } while (exception.retry);
8676         return err;
8677 }
8678 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8679
8680 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8681 {
8682         struct nfs4_layoutcommit_data *data = calldata;
8683         struct nfs_server *server = NFS_SERVER(data->args.inode);
8684         struct nfs4_session *session = nfs4_get_session(server);
8685
8686         nfs41_setup_sequence(session,
8687                         &data->args.seq_args,
8688                         &data->res.seq_res,
8689                         task);
8690 }
8691
8692 static void
8693 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8694 {
8695         struct nfs4_layoutcommit_data *data = calldata;
8696         struct nfs_server *server = NFS_SERVER(data->args.inode);
8697
8698         if (!nfs41_sequence_done(task, &data->res.seq_res))
8699                 return;
8700
8701         switch (task->tk_status) { /* Just ignore these failures */
8702         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8703         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8704         case -NFS4ERR_BADLAYOUT:     /* no layout */
8705         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8706                 task->tk_status = 0;
8707         case 0:
8708                 break;
8709         default:
8710                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8711                         rpc_restart_call_prepare(task);
8712                         return;
8713                 }
8714         }
8715 }
8716
8717 static void nfs4_layoutcommit_release(void *calldata)
8718 {
8719         struct nfs4_layoutcommit_data *data = calldata;
8720
8721         pnfs_cleanup_layoutcommit(data);
8722         nfs_post_op_update_inode_force_wcc(data->args.inode,
8723                                            data->res.fattr);
8724         put_rpccred(data->cred);
8725         nfs_iput_and_deactive(data->inode);
8726         kfree(data);
8727 }
8728
8729 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8730         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8731         .rpc_call_done = nfs4_layoutcommit_done,
8732         .rpc_release = nfs4_layoutcommit_release,
8733 };
8734
8735 int
8736 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8737 {
8738         struct rpc_message msg = {
8739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8740                 .rpc_argp = &data->args,
8741                 .rpc_resp = &data->res,
8742                 .rpc_cred = data->cred,
8743         };
8744         struct rpc_task_setup task_setup_data = {
8745                 .task = &data->task,
8746                 .rpc_client = NFS_CLIENT(data->args.inode),
8747                 .rpc_message = &msg,
8748                 .callback_ops = &nfs4_layoutcommit_ops,
8749                 .callback_data = data,
8750         };
8751         struct rpc_task *task;
8752         int status = 0;
8753
8754         dprintk("NFS: initiating layoutcommit call. sync %d "
8755                 "lbw: %llu inode %lu\n", sync,
8756                 data->args.lastbytewritten,
8757                 data->args.inode->i_ino);
8758
8759         if (!sync) {
8760                 data->inode = nfs_igrab_and_active(data->args.inode);
8761                 if (data->inode == NULL) {
8762                         nfs4_layoutcommit_release(data);
8763                         return -EAGAIN;
8764                 }
8765                 task_setup_data.flags = RPC_TASK_ASYNC;
8766         }
8767         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8768         task = rpc_run_task(&task_setup_data);
8769         if (IS_ERR(task))
8770                 return PTR_ERR(task);
8771         if (sync)
8772                 status = task->tk_status;
8773         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
8774         dprintk("%s: status %d\n", __func__, status);
8775         rpc_put_task(task);
8776         return status;
8777 }
8778
8779 /**
8780  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8781  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8782  */
8783 static int
8784 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8785                     struct nfs_fsinfo *info,
8786                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8787 {
8788         struct nfs41_secinfo_no_name_args args = {
8789                 .style = SECINFO_STYLE_CURRENT_FH,
8790         };
8791         struct nfs4_secinfo_res res = {
8792                 .flavors = flavors,
8793         };
8794         struct rpc_message msg = {
8795                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8796                 .rpc_argp = &args,
8797                 .rpc_resp = &res,
8798         };
8799         struct rpc_clnt *clnt = server->client;
8800         struct rpc_cred *cred = NULL;
8801         int status;
8802
8803         if (use_integrity) {
8804                 clnt = server->nfs_client->cl_rpcclient;
8805                 cred = nfs4_get_clid_cred(server->nfs_client);
8806                 msg.rpc_cred = cred;
8807         }
8808
8809         dprintk("--> %s\n", __func__);
8810         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8811                                 &res.seq_res, 0);
8812         dprintk("<-- %s status=%d\n", __func__, status);
8813
8814         if (cred)
8815                 put_rpccred(cred);
8816
8817         return status;
8818 }
8819
8820 static int
8821 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8822                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8823 {
8824         struct nfs4_exception exception = { };
8825         int err;
8826         do {
8827                 /* first try using integrity protection */
8828                 err = -NFS4ERR_WRONGSEC;
8829
8830                 /* try to use integrity protection with machine cred */
8831                 if (_nfs4_is_integrity_protected(server->nfs_client))
8832                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8833                                                           flavors, true);
8834
8835                 /*
8836                  * if unable to use integrity protection, or SECINFO with
8837                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8838                  * disallowed by spec, but exists in deployed servers) use
8839                  * the current filesystem's rpc_client and the user cred.
8840                  */
8841                 if (err == -NFS4ERR_WRONGSEC)
8842                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8843                                                           flavors, false);
8844
8845                 switch (err) {
8846                 case 0:
8847                 case -NFS4ERR_WRONGSEC:
8848                 case -ENOTSUPP:
8849                         goto out;
8850                 default:
8851                         err = nfs4_handle_exception(server, err, &exception);
8852                 }
8853         } while (exception.retry);
8854 out:
8855         return err;
8856 }
8857
8858 static int
8859 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8860                     struct nfs_fsinfo *info)
8861 {
8862         int err;
8863         struct page *page;
8864         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8865         struct nfs4_secinfo_flavors *flavors;
8866         struct nfs4_secinfo4 *secinfo;
8867         int i;
8868
8869         page = alloc_page(GFP_KERNEL);
8870         if (!page) {
8871                 err = -ENOMEM;
8872                 goto out;
8873         }
8874
8875         flavors = page_address(page);
8876         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8877
8878         /*
8879          * Fall back on "guess and check" method if
8880          * the server doesn't support SECINFO_NO_NAME
8881          */
8882         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8883                 err = nfs4_find_root_sec(server, fhandle, info);
8884                 goto out_freepage;
8885         }
8886         if (err)
8887                 goto out_freepage;
8888
8889         for (i = 0; i < flavors->num_flavors; i++) {
8890                 secinfo = &flavors->flavors[i];
8891
8892                 switch (secinfo->flavor) {
8893                 case RPC_AUTH_NULL:
8894                 case RPC_AUTH_UNIX:
8895                 case RPC_AUTH_GSS:
8896                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8897                                         &secinfo->flavor_info);
8898                         break;
8899                 default:
8900                         flavor = RPC_AUTH_MAXFLAVOR;
8901                         break;
8902                 }
8903
8904                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8905                         flavor = RPC_AUTH_MAXFLAVOR;
8906
8907                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8908                         err = nfs4_lookup_root_sec(server, fhandle,
8909                                                    info, flavor);
8910                         if (!err)
8911                                 break;
8912                 }
8913         }
8914
8915         if (flavor == RPC_AUTH_MAXFLAVOR)
8916                 err = -EPERM;
8917
8918 out_freepage:
8919         put_page(page);
8920         if (err == -EACCES)
8921                 return -EPERM;
8922 out:
8923         return err;
8924 }
8925
8926 static int _nfs41_test_stateid(struct nfs_server *server,
8927                 nfs4_stateid *stateid,
8928                 struct rpc_cred *cred)
8929 {
8930         int status;
8931         struct nfs41_test_stateid_args args = {
8932                 .stateid = stateid,
8933         };
8934         struct nfs41_test_stateid_res res;
8935         struct rpc_message msg = {
8936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8937                 .rpc_argp = &args,
8938                 .rpc_resp = &res,
8939                 .rpc_cred = cred,
8940         };
8941         struct rpc_clnt *rpc_client = server->client;
8942
8943         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8944                 &rpc_client, &msg);
8945
8946         dprintk("NFS call  test_stateid %p\n", stateid);
8947         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8948         nfs4_set_sequence_privileged(&args.seq_args);
8949         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8950                         &args.seq_args, &res.seq_res);
8951         if (status != NFS_OK) {
8952                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8953                 return status;
8954         }
8955         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8956         return -res.status;
8957 }
8958
8959 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
8960                 int err, struct nfs4_exception *exception)
8961 {
8962         exception->retry = 0;
8963         switch(err) {
8964         case -NFS4ERR_DELAY:
8965         case -NFS4ERR_RETRY_UNCACHED_REP:
8966                 nfs4_handle_exception(server, err, exception);
8967                 break;
8968         case -NFS4ERR_BADSESSION:
8969         case -NFS4ERR_BADSLOT:
8970         case -NFS4ERR_BAD_HIGH_SLOT:
8971         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
8972         case -NFS4ERR_DEADSESSION:
8973                 nfs4_do_handle_exception(server, err, exception);
8974         }
8975 }
8976
8977 /**
8978  * nfs41_test_stateid - perform a TEST_STATEID operation
8979  *
8980  * @server: server / transport on which to perform the operation
8981  * @stateid: state ID to test
8982  * @cred: credential
8983  *
8984  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8985  * Otherwise a negative NFS4ERR value is returned if the operation
8986  * failed or the state ID is not currently valid.
8987  */
8988 static int nfs41_test_stateid(struct nfs_server *server,
8989                 nfs4_stateid *stateid,
8990                 struct rpc_cred *cred)
8991 {
8992         struct nfs4_exception exception = { };
8993         int err;
8994         do {
8995                 err = _nfs41_test_stateid(server, stateid, cred);
8996                 nfs4_handle_delay_or_session_error(server, err, &exception);
8997         } while (exception.retry);
8998         return err;
8999 }
9000
9001 struct nfs_free_stateid_data {
9002         struct nfs_server *server;
9003         struct nfs41_free_stateid_args args;
9004         struct nfs41_free_stateid_res res;
9005 };
9006
9007 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
9008 {
9009         struct nfs_free_stateid_data *data = calldata;
9010         nfs41_setup_sequence(nfs4_get_session(data->server),
9011                         &data->args.seq_args,
9012                         &data->res.seq_res,
9013                         task);
9014 }
9015
9016 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
9017 {
9018         struct nfs_free_stateid_data *data = calldata;
9019
9020         nfs41_sequence_done(task, &data->res.seq_res);
9021
9022         switch (task->tk_status) {
9023         case -NFS4ERR_DELAY:
9024                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
9025                         rpc_restart_call_prepare(task);
9026         }
9027 }
9028
9029 static void nfs41_free_stateid_release(void *calldata)
9030 {
9031         kfree(calldata);
9032 }
9033
9034 static const struct rpc_call_ops nfs41_free_stateid_ops = {
9035         .rpc_call_prepare = nfs41_free_stateid_prepare,
9036         .rpc_call_done = nfs41_free_stateid_done,
9037         .rpc_release = nfs41_free_stateid_release,
9038 };
9039
9040 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
9041                 const nfs4_stateid *stateid,
9042                 struct rpc_cred *cred,
9043                 bool privileged)
9044 {
9045         struct rpc_message msg = {
9046                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
9047                 .rpc_cred = cred,
9048         };
9049         struct rpc_task_setup task_setup = {
9050                 .rpc_client = server->client,
9051                 .rpc_message = &msg,
9052                 .callback_ops = &nfs41_free_stateid_ops,
9053                 .flags = RPC_TASK_ASYNC,
9054         };
9055         struct nfs_free_stateid_data *data;
9056
9057         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9058                 &task_setup.rpc_client, &msg);
9059
9060         dprintk("NFS call  free_stateid %p\n", stateid);
9061         data = kmalloc(sizeof(*data), GFP_NOFS);
9062         if (!data)
9063                 return ERR_PTR(-ENOMEM);
9064         data->server = server;
9065         nfs4_stateid_copy(&data->args.stateid, stateid);
9066
9067         task_setup.callback_data = data;
9068
9069         msg.rpc_argp = &data->args;
9070         msg.rpc_resp = &data->res;
9071         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
9072         if (privileged)
9073                 nfs4_set_sequence_privileged(&data->args.seq_args);
9074
9075         return rpc_run_task(&task_setup);
9076 }
9077
9078 /**
9079  * nfs41_free_stateid - perform a FREE_STATEID operation
9080  *
9081  * @server: server / transport on which to perform the operation
9082  * @stateid: state ID to release
9083  * @cred: credential
9084  * @is_recovery: set to true if this call needs to be privileged
9085  *
9086  * Note: this function is always asynchronous.
9087  */
9088 static int nfs41_free_stateid(struct nfs_server *server,
9089                 const nfs4_stateid *stateid,
9090                 struct rpc_cred *cred,
9091                 bool is_recovery)
9092 {
9093         struct rpc_task *task;
9094
9095         task = _nfs41_free_stateid(server, stateid, cred, is_recovery);
9096         if (IS_ERR(task))
9097                 return PTR_ERR(task);
9098         rpc_put_task(task);
9099         return 0;
9100 }
9101
9102 static void
9103 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
9104 {
9105         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
9106
9107         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
9108         nfs4_free_lock_state(server, lsp);
9109 }
9110
9111 static bool nfs41_match_stateid(const nfs4_stateid *s1,
9112                 const nfs4_stateid *s2)
9113 {
9114         if (s1->type != s2->type)
9115                 return false;
9116
9117         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
9118                 return false;
9119
9120         if (s1->seqid == s2->seqid)
9121                 return true;
9122         if (s1->seqid == 0 || s2->seqid == 0)
9123                 return true;
9124
9125         return false;
9126 }
9127
9128 #endif /* CONFIG_NFS_V4_1 */
9129
9130 static bool nfs4_match_stateid(const nfs4_stateid *s1,
9131                 const nfs4_stateid *s2)
9132 {
9133         return nfs4_stateid_match(s1, s2);
9134 }
9135
9136
9137 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
9138         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9139         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9140         .recover_open   = nfs4_open_reclaim,
9141         .recover_lock   = nfs4_lock_reclaim,
9142         .establish_clid = nfs4_init_clientid,
9143         .detect_trunking = nfs40_discover_server_trunking,
9144 };
9145
9146 #if defined(CONFIG_NFS_V4_1)
9147 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
9148         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9149         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9150         .recover_open   = nfs4_open_reclaim,
9151         .recover_lock   = nfs4_lock_reclaim,
9152         .establish_clid = nfs41_init_clientid,
9153         .reclaim_complete = nfs41_proc_reclaim_complete,
9154         .detect_trunking = nfs41_discover_server_trunking,
9155 };
9156 #endif /* CONFIG_NFS_V4_1 */
9157
9158 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
9159         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9160         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9161         .recover_open   = nfs40_open_expired,
9162         .recover_lock   = nfs4_lock_expired,
9163         .establish_clid = nfs4_init_clientid,
9164 };
9165
9166 #if defined(CONFIG_NFS_V4_1)
9167 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
9168         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9169         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9170         .recover_open   = nfs41_open_expired,
9171         .recover_lock   = nfs41_lock_expired,
9172         .establish_clid = nfs41_init_clientid,
9173 };
9174 #endif /* CONFIG_NFS_V4_1 */
9175
9176 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
9177         .sched_state_renewal = nfs4_proc_async_renew,
9178         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
9179         .renew_lease = nfs4_proc_renew,
9180 };
9181
9182 #if defined(CONFIG_NFS_V4_1)
9183 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
9184         .sched_state_renewal = nfs41_proc_async_sequence,
9185         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
9186         .renew_lease = nfs4_proc_sequence,
9187 };
9188 #endif
9189
9190 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
9191         .get_locations = _nfs40_proc_get_locations,
9192         .fsid_present = _nfs40_proc_fsid_present,
9193 };
9194
9195 #if defined(CONFIG_NFS_V4_1)
9196 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
9197         .get_locations = _nfs41_proc_get_locations,
9198         .fsid_present = _nfs41_proc_fsid_present,
9199 };
9200 #endif  /* CONFIG_NFS_V4_1 */
9201
9202 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
9203         .minor_version = 0,
9204         .init_caps = NFS_CAP_READDIRPLUS
9205                 | NFS_CAP_ATOMIC_OPEN
9206                 | NFS_CAP_POSIX_LOCK,
9207         .init_client = nfs40_init_client,
9208         .shutdown_client = nfs40_shutdown_client,
9209         .match_stateid = nfs4_match_stateid,
9210         .find_root_sec = nfs4_find_root_sec,
9211         .free_lock_state = nfs4_release_lockowner,
9212         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
9213         .alloc_seqid = nfs_alloc_seqid,
9214         .call_sync_ops = &nfs40_call_sync_ops,
9215         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
9216         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
9217         .state_renewal_ops = &nfs40_state_renewal_ops,
9218         .mig_recovery_ops = &nfs40_mig_recovery_ops,
9219 };
9220
9221 #if defined(CONFIG_NFS_V4_1)
9222 static struct nfs_seqid *
9223 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
9224 {
9225         return NULL;
9226 }
9227
9228 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
9229         .minor_version = 1,
9230         .init_caps = NFS_CAP_READDIRPLUS
9231                 | NFS_CAP_ATOMIC_OPEN
9232                 | NFS_CAP_POSIX_LOCK
9233                 | NFS_CAP_STATEID_NFSV41
9234                 | NFS_CAP_ATOMIC_OPEN_V1,
9235         .init_client = nfs41_init_client,
9236         .shutdown_client = nfs41_shutdown_client,
9237         .match_stateid = nfs41_match_stateid,
9238         .find_root_sec = nfs41_find_root_sec,
9239         .free_lock_state = nfs41_free_lock_state,
9240         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9241         .alloc_seqid = nfs_alloc_no_seqid,
9242         .session_trunk = nfs4_test_session_trunk,
9243         .call_sync_ops = &nfs41_call_sync_ops,
9244         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9245         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9246         .state_renewal_ops = &nfs41_state_renewal_ops,
9247         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9248 };
9249 #endif
9250
9251 #if defined(CONFIG_NFS_V4_2)
9252 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
9253         .minor_version = 2,
9254         .init_caps = NFS_CAP_READDIRPLUS
9255                 | NFS_CAP_ATOMIC_OPEN
9256                 | NFS_CAP_POSIX_LOCK
9257                 | NFS_CAP_STATEID_NFSV41
9258                 | NFS_CAP_ATOMIC_OPEN_V1
9259                 | NFS_CAP_ALLOCATE
9260                 | NFS_CAP_COPY
9261                 | NFS_CAP_DEALLOCATE
9262                 | NFS_CAP_SEEK
9263                 | NFS_CAP_LAYOUTSTATS
9264                 | NFS_CAP_CLONE,
9265         .init_client = nfs41_init_client,
9266         .shutdown_client = nfs41_shutdown_client,
9267         .match_stateid = nfs41_match_stateid,
9268         .find_root_sec = nfs41_find_root_sec,
9269         .free_lock_state = nfs41_free_lock_state,
9270         .call_sync_ops = &nfs41_call_sync_ops,
9271         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9272         .alloc_seqid = nfs_alloc_no_seqid,
9273         .session_trunk = nfs4_test_session_trunk,
9274         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9275         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9276         .state_renewal_ops = &nfs41_state_renewal_ops,
9277         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9278 };
9279 #endif
9280
9281 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
9282         [0] = &nfs_v4_0_minor_ops,
9283 #if defined(CONFIG_NFS_V4_1)
9284         [1] = &nfs_v4_1_minor_ops,
9285 #endif
9286 #if defined(CONFIG_NFS_V4_2)
9287         [2] = &nfs_v4_2_minor_ops,
9288 #endif
9289 };
9290
9291 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
9292 {
9293         ssize_t error, error2;
9294
9295         error = generic_listxattr(dentry, list, size);
9296         if (error < 0)
9297                 return error;
9298         if (list) {
9299                 list += error;
9300                 size -= error;
9301         }
9302
9303         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
9304         if (error2 < 0)
9305                 return error2;
9306         return error + error2;
9307 }
9308
9309 static const struct inode_operations nfs4_dir_inode_operations = {
9310         .create         = nfs_create,
9311         .lookup         = nfs_lookup,
9312         .atomic_open    = nfs_atomic_open,
9313         .link           = nfs_link,
9314         .unlink         = nfs_unlink,
9315         .symlink        = nfs_symlink,
9316         .mkdir          = nfs_mkdir,
9317         .rmdir          = nfs_rmdir,
9318         .mknod          = nfs_mknod,
9319         .rename         = nfs_rename,
9320         .permission     = nfs_permission,
9321         .getattr        = nfs_getattr,
9322         .setattr        = nfs_setattr,
9323         .listxattr      = nfs4_listxattr,
9324 };
9325
9326 static const struct inode_operations nfs4_file_inode_operations = {
9327         .permission     = nfs_permission,
9328         .getattr        = nfs_getattr,
9329         .setattr        = nfs_setattr,
9330         .listxattr      = nfs4_listxattr,
9331 };
9332
9333 const struct nfs_rpc_ops nfs_v4_clientops = {
9334         .version        = 4,                    /* protocol version */
9335         .dentry_ops     = &nfs4_dentry_operations,
9336         .dir_inode_ops  = &nfs4_dir_inode_operations,
9337         .file_inode_ops = &nfs4_file_inode_operations,
9338         .file_ops       = &nfs4_file_operations,
9339         .getroot        = nfs4_proc_get_root,
9340         .submount       = nfs4_submount,
9341         .try_mount      = nfs4_try_mount,
9342         .getattr        = nfs4_proc_getattr,
9343         .setattr        = nfs4_proc_setattr,
9344         .lookup         = nfs4_proc_lookup,
9345         .access         = nfs4_proc_access,
9346         .readlink       = nfs4_proc_readlink,
9347         .create         = nfs4_proc_create,
9348         .remove         = nfs4_proc_remove,
9349         .unlink_setup   = nfs4_proc_unlink_setup,
9350         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
9351         .unlink_done    = nfs4_proc_unlink_done,
9352         .rename_setup   = nfs4_proc_rename_setup,
9353         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
9354         .rename_done    = nfs4_proc_rename_done,
9355         .link           = nfs4_proc_link,
9356         .symlink        = nfs4_proc_symlink,
9357         .mkdir          = nfs4_proc_mkdir,
9358         .rmdir          = nfs4_proc_remove,
9359         .readdir        = nfs4_proc_readdir,
9360         .mknod          = nfs4_proc_mknod,
9361         .statfs         = nfs4_proc_statfs,
9362         .fsinfo         = nfs4_proc_fsinfo,
9363         .pathconf       = nfs4_proc_pathconf,
9364         .set_capabilities = nfs4_server_capabilities,
9365         .decode_dirent  = nfs4_decode_dirent,
9366         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
9367         .read_setup     = nfs4_proc_read_setup,
9368         .read_done      = nfs4_read_done,
9369         .write_setup    = nfs4_proc_write_setup,
9370         .write_done     = nfs4_write_done,
9371         .commit_setup   = nfs4_proc_commit_setup,
9372         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
9373         .commit_done    = nfs4_commit_done,
9374         .lock           = nfs4_proc_lock,
9375         .clear_acl_cache = nfs4_zap_acl_attr,
9376         .close_context  = nfs4_close_context,
9377         .open_context   = nfs4_atomic_open,
9378         .have_delegation = nfs4_have_delegation,
9379         .return_delegation = nfs4_inode_return_delegation,
9380         .alloc_client   = nfs4_alloc_client,
9381         .init_client    = nfs4_init_client,
9382         .free_client    = nfs4_free_client,
9383         .create_server  = nfs4_create_server,
9384         .clone_server   = nfs_clone_server,
9385 };
9386
9387 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
9388         .name   = XATTR_NAME_NFSV4_ACL,
9389         .list   = nfs4_xattr_list_nfs4_acl,
9390         .get    = nfs4_xattr_get_nfs4_acl,
9391         .set    = nfs4_xattr_set_nfs4_acl,
9392 };
9393
9394 const struct xattr_handler *nfs4_xattr_handlers[] = {
9395         &nfs4_xattr_nfs4_acl_handler,
9396 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
9397         &nfs4_xattr_nfs4_label_handler,
9398 #endif
9399         NULL
9400 };
9401
9402 /*
9403  * Local variables:
9404  *  c-basic-offset: 8
9405  * End:
9406  */