fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.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 "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_ACCESS:
 162                 return -EACCES;
 163         case -NFS4ERR_FILE_OPEN:
 164                 return -EBUSY;
 165         default:
 166                 dprintk("%s could not handle NFSv4 error %d\n",
 167                                 __func__, -err);
 168                 break;
 169         }
 170         return -EIO;
 171 }
 172
 173 /*
 174  * This is our standard bitmap for GETATTR requests.
 175  */
 176 const u32 nfs4_fattr_bitmap[3] = {
 177         FATTR4_WORD0_TYPE
 178         | FATTR4_WORD0_CHANGE
 179         | FATTR4_WORD0_SIZE
 180         | FATTR4_WORD0_FSID
 181         | FATTR4_WORD0_FILEID,
 182         FATTR4_WORD1_MODE
 183         | FATTR4_WORD1_NUMLINKS
 184         | FATTR4_WORD1_OWNER
 185         | FATTR4_WORD1_OWNER_GROUP
 186         | FATTR4_WORD1_RAWDEV
 187         | FATTR4_WORD1_SPACE_USED
 188         | FATTR4_WORD1_TIME_ACCESS
 189         | FATTR4_WORD1_TIME_METADATA
 190         | FATTR4_WORD1_TIME_MODIFY,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 318 {
 319         int res = 0;
 320
 321         might_sleep();
 322
 323         if (*timeout <= 0)
 324                 *timeout = NFS4_POLL_RETRY_MIN;
 325         if (*timeout > NFS4_POLL_RETRY_MAX)
 326                 *timeout = NFS4_POLL_RETRY_MAX;
 327         freezable_schedule_timeout_killable_unsafe(*timeout);
 328         if (fatal_signal_pending(current))
 329                 res = -ERESTARTSYS;
 330         *timeout <<= 1;
 331         return res;
 332 }
 333
 334 /* This is the error handling routine for processes that are allowed
 335  * to sleep.
 336  */
 337 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 338 {
 339         struct nfs_client *clp = server->nfs_client;
 340         struct nfs4_state *state = exception->state;
 341         struct inode *inode = exception->inode;
 342         int ret = errorcode;
 343
 344         exception->retry = 0;
 345         switch(errorcode) {
 346                 case 0:
 347                         return 0;
 348                 case -NFS4ERR_OPENMODE:
 349                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 350                                 nfs4_inode_return_delegation(inode);
 351                                 exception->retry = 1;
 352                                 return 0;
 353                         }
 354                         if (state == NULL)
 355                                 break;
 356                         ret = nfs4_schedule_stateid_recovery(server, state);
 357                         if (ret < 0)
 358                                 break;
 359                         goto wait_on_recovery;
 360                 case -NFS4ERR_DELEG_REVOKED:
 361                 case -NFS4ERR_ADMIN_REVOKED:
 362                 case -NFS4ERR_BAD_STATEID:
 363                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 364                                 nfs_remove_bad_delegation(inode);
 365                                 exception->retry = 1;
 366                                 break;
 367                         }
 368                         if (state == NULL)
 369                                 break;
 370                         ret = nfs4_schedule_stateid_recovery(server, state);
 371                         if (ret < 0)
 372                                 break;
 373                         goto wait_on_recovery;
 374                 case -NFS4ERR_EXPIRED:
 375                         if (state != NULL) {
 376                                 ret = nfs4_schedule_stateid_recovery(server, state);
 377                                 if (ret < 0)
 378                                         break;
 379                         }
 380                 case -NFS4ERR_STALE_STATEID:
 381                 case -NFS4ERR_STALE_CLIENTID:
 382                         nfs4_schedule_lease_recovery(clp);
 383                         goto wait_on_recovery;
 384                 case -NFS4ERR_MOVED:
 385                         ret = nfs4_schedule_migration_recovery(server);
 386                         if (ret < 0)
 387                                 break;
 388                         goto wait_on_recovery;
 389                 case -NFS4ERR_LEASE_MOVED:
 390                         nfs4_schedule_lease_moved_recovery(clp);
 391                         goto wait_on_recovery;
 392 #if defined(CONFIG_NFS_V4_1)
 393                 case -NFS4ERR_BADSESSION:
 394                 case -NFS4ERR_BADSLOT:
 395                 case -NFS4ERR_BAD_HIGH_SLOT:
 396                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 397                 case -NFS4ERR_DEADSESSION:
 398                 case -NFS4ERR_SEQ_FALSE_RETRY:
 399                 case -NFS4ERR_SEQ_MISORDERED:
 400                         dprintk("%s ERROR: %d Reset session\n", __func__,
 401                                 errorcode);
 402                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 403                         goto wait_on_recovery;
 404 #endif /* defined(CONFIG_NFS_V4_1) */
 405                 case -NFS4ERR_FILE_OPEN:
 406                         if (exception->timeout > HZ) {
 407                                 /* We have retried a decent amount, time to
 408                                  * fail
 409                                  */
 410                                 ret = -EBUSY;
 411                                 break;
 412                         }
 413                 case -NFS4ERR_GRACE:
 414                 case -NFS4ERR_DELAY:
 415                         ret = nfs4_delay(server->client, &exception->timeout);
 416                         if (ret != 0)
 417                                 break;
 418                 case -NFS4ERR_RETRY_UNCACHED_REP:
 419                 case -NFS4ERR_OLD_STATEID:
 420                         exception->retry = 1;
 421                         break;
 422                 case -NFS4ERR_BADOWNER:
 423                         /* The following works around a Linux server bug! */
 424                 case -NFS4ERR_BADNAME:
 425                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 426                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 427                                 exception->retry = 1;
 428                                 printk(KERN_WARNING "NFS: v4 server %s "
 429                                                 "does not accept raw "
 430                                                 "uid/gids. "
 431                                                 "Reenabling the idmapper.\n",
 432                                                 server->nfs_client->cl_hostname);
 433                         }
 434         }
 435         /* We failed to handle the error */
 436         return nfs4_map_errors(ret);
 437 wait_on_recovery:
 438         ret = nfs4_wait_clnt_recover(clp);
 439         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 440                 return -EIO;
 441         if (ret == 0)
 442                 exception->retry = 1;
 443         return ret;
 444 }
 445
 446 /*
 447  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 448  * or 'false' otherwise.
 449  */
 450 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 451 {
 452         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 453
 454         if (flavor == RPC_AUTH_GSS_KRB5I ||
 455             flavor == RPC_AUTH_GSS_KRB5P)
 456                 return true;
 457
 458         return false;
 459 }
 460
 461 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 462 {
 463         spin_lock(&clp->cl_lock);
 464         if (time_before(clp->cl_last_renewal,timestamp))
 465                 clp->cl_last_renewal = timestamp;
 466         spin_unlock(&clp->cl_lock);
 467 }
 468
 469 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 470 {
 471         do_renew_lease(server->nfs_client, timestamp);
 472 }
 473
 474 struct nfs4_call_sync_data {
 475         const struct nfs_server *seq_server;
 476         struct nfs4_sequence_args *seq_args;
 477         struct nfs4_sequence_res *seq_res;
 478 };
 479
 480 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 481                                struct nfs4_sequence_res *res, int cache_reply)
 482 {
 483         args->sa_slot = NULL;
 484         args->sa_cache_this = cache_reply;
 485         args->sa_privileged = 0;
 486
 487         res->sr_slot = NULL;
 488 }
 489
 490 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 491 {
 492         args->sa_privileged = 1;
 493 }
 494
 495 static int nfs40_setup_sequence(const struct nfs_server *server,
 496                                 struct nfs4_sequence_args *args,
 497                                 struct nfs4_sequence_res *res,
 498                                 struct rpc_task *task)
 499 {
 500         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 501         struct nfs4_slot *slot;
 502
 503         /* slot already allocated? */
 504         if (res->sr_slot != NULL)
 505                 goto out_start;
 506
 507         spin_lock(&tbl->slot_tbl_lock);
 508         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 509                 goto out_sleep;
 510
 511         slot = nfs4_alloc_slot(tbl);
 512         if (IS_ERR(slot)) {
 513                 if (slot == ERR_PTR(-ENOMEM))
 514                         task->tk_timeout = HZ >> 2;
 515                 goto out_sleep;
 516         }
 517         spin_unlock(&tbl->slot_tbl_lock);
 518
 519         args->sa_slot = slot;
 520         res->sr_slot = slot;
 521
 522 out_start:
 523         rpc_call_start(task);
 524         return 0;
 525
 526 out_sleep:
 527         if (args->sa_privileged)
 528                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 529                                 NULL, RPC_PRIORITY_PRIVILEGED);
 530         else
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532         spin_unlock(&tbl->slot_tbl_lock);
 533         return -EAGAIN;
 534 }
 535
 536 static int nfs40_sequence_done(struct rpc_task *task,
 537                                struct nfs4_sequence_res *res)
 538 {
 539         struct nfs4_slot *slot = res->sr_slot;
 540         struct nfs4_slot_table *tbl;
 541
 542         if (slot == NULL)
 543                 goto out;
 544
 545         tbl = slot->table;
 546         spin_lock(&tbl->slot_tbl_lock);
 547         if (!nfs41_wake_and_assign_slot(tbl, slot))
 548                 nfs4_free_slot(tbl, slot);
 549         spin_unlock(&tbl->slot_tbl_lock);
 550
 551         res->sr_slot = NULL;
 552 out:
 553         return 1;
 554 }
 555
 556 #if defined(CONFIG_NFS_V4_1)
 557
 558 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 559 {
 560         struct nfs4_session *session;
 561         struct nfs4_slot_table *tbl;
 562         struct nfs4_slot *slot = res->sr_slot;
 563         bool send_new_highest_used_slotid = false;
 564
 565         tbl = slot->table;
 566         session = tbl->session;
 567
 568         spin_lock(&tbl->slot_tbl_lock);
 569         /* Be nice to the server: try to ensure that the last transmitted
 570          * value for highest_user_slotid <= target_highest_slotid
 571          */
 572         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 573                 send_new_highest_used_slotid = true;
 574
 575         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 576                 send_new_highest_used_slotid = false;
 577                 goto out_unlock;
 578         }
 579         nfs4_free_slot(tbl, slot);
 580
 581         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 582                 send_new_highest_used_slotid = false;
 583 out_unlock:
 584         spin_unlock(&tbl->slot_tbl_lock);
 585         res->sr_slot = NULL;
 586         if (send_new_highest_used_slotid)
 587                 nfs41_server_notify_highest_slotid_update(session->clp);
 588 }
 589
 590 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 591 {
 592         struct nfs4_session *session;
 593         struct nfs4_slot *slot = res->sr_slot;
 594         struct nfs_client *clp;
 595         bool interrupted = false;
 596         int ret = 1;
 597
 598         if (slot == NULL)
 599                 goto out_noaction;
 600         /* don't increment the sequence number if the task wasn't sent */
 601         if (!RPC_WAS_SENT(task))
 602                 goto out;
 603
 604         session = slot->table->session;
 605
 606         if (slot->interrupted) {
 607                 slot->interrupted = 0;
 608                 interrupted = true;
 609         }
 610
 611         trace_nfs4_sequence_done(session, res);
 612         /* Check the SEQUENCE operation status */
 613         switch (res->sr_status) {
 614         case 0:
 615                 /* Update the slot's sequence and clientid lease timer */
 616                 ++slot->seq_nr;
 617                 clp = session->clp;
 618                 do_renew_lease(clp, res->sr_timestamp);
 619                 /* Check sequence flags */
 620                 if (res->sr_status_flags != 0)
 621                         nfs4_schedule_lease_recovery(clp);
 622                 nfs41_update_target_slotid(slot->table, slot, res);
 623                 break;
 624         case 1:
 625                 /*
 626                  * sr_status remains 1 if an RPC level error occurred.
 627                  * The server may or may not have processed the sequence
 628                  * operation..
 629                  * Mark the slot as having hosted an interrupted RPC call.
 630                  */
 631                 slot->interrupted = 1;
 632                 goto out;
 633         case -NFS4ERR_DELAY:
 634                 /* The server detected a resend of the RPC call and
 635                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 636                  * of RFC5661.
 637                  */
 638                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 639                         __func__,
 640                         slot->slot_nr,
 641                         slot->seq_nr);
 642                 goto out_retry;
 643         case -NFS4ERR_BADSLOT:
 644                 /*
 645                  * The slot id we used was probably retired. Try again
 646                  * using a different slot id.
 647                  */
 648                 goto retry_nowait;
 649         case -NFS4ERR_SEQ_MISORDERED:
 650                 /*
 651                  * Was the last operation on this sequence interrupted?
 652                  * If so, retry after bumping the sequence number.
 653                  */
 654                 if (interrupted) {
 655                         ++slot->seq_nr;
 656                         goto retry_nowait;
 657                 }
 658                 /*
 659                  * Could this slot have been previously retired?
 660                  * If so, then the server may be expecting seq_nr = 1!
 661                  */
 662                 if (slot->seq_nr != 1) {
 663                         slot->seq_nr = 1;
 664                         goto retry_nowait;
 665                 }
 666                 break;
 667         case -NFS4ERR_SEQ_FALSE_RETRY:
 668                 ++slot->seq_nr;
 669                 goto retry_nowait;
 670         default:
 671                 /* Just update the slot sequence no. */
 672                 ++slot->seq_nr;
 673         }
 674 out:
 675         /* The session may be reset by one of the error handlers. */
 676         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 677         nfs41_sequence_free_slot(res);
 678 out_noaction:
 679         return ret;
 680 retry_nowait:
 681         if (rpc_restart_call_prepare(task)) {
 682                 task->tk_status = 0;
 683                 ret = 0;
 684         }
 685         goto out;
 686 out_retry:
 687         if (!rpc_restart_call(task))
 688                 goto out;
 689         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 690         return 0;
 691 }
 692 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 693
 694 static int nfs4_sequence_done(struct rpc_task *task,
 695                                struct nfs4_sequence_res *res)
 696 {
 697         if (res->sr_slot == NULL)
 698                 return 1;
 699         if (!res->sr_slot->table->session)
 700                 return nfs40_sequence_done(task, res);
 701         return nfs41_sequence_done(task, res);
 702 }
 703
 704 int nfs41_setup_sequence(struct nfs4_session *session,
 705                                 struct nfs4_sequence_args *args,
 706                                 struct nfs4_sequence_res *res,
 707                                 struct rpc_task *task)
 708 {
 709         struct nfs4_slot *slot;
 710         struct nfs4_slot_table *tbl;
 711
 712         dprintk("--> %s\n", __func__);
 713         /* slot already allocated? */
 714         if (res->sr_slot != NULL)
 715                 goto out_success;
 716
 717         tbl = &session->fc_slot_table;
 718
 719         task->tk_timeout = 0;
 720
 721         spin_lock(&tbl->slot_tbl_lock);
 722         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 723             !args->sa_privileged) {
 724                 /* The state manager will wait until the slot table is empty */
 725                 dprintk("%s session is draining\n", __func__);
 726                 goto out_sleep;
 727         }
 728
 729         slot = nfs4_alloc_slot(tbl);
 730         if (IS_ERR(slot)) {
 731                 /* If out of memory, try again in 1/4 second */
 732                 if (slot == ERR_PTR(-ENOMEM))
 733                         task->tk_timeout = HZ >> 2;
 734                 dprintk("<-- %s: no free slots\n", __func__);
 735                 goto out_sleep;
 736         }
 737         spin_unlock(&tbl->slot_tbl_lock);
 738
 739         args->sa_slot = slot;
 740
 741         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 742                         slot->slot_nr, slot->seq_nr);
 743
 744         res->sr_slot = slot;
 745         res->sr_timestamp = jiffies;
 746         res->sr_status_flags = 0;
 747         /*
 748          * sr_status is only set in decode_sequence, and so will remain
 749          * set to 1 if an rpc level failure occurs.
 750          */
 751         res->sr_status = 1;
 752         trace_nfs4_setup_sequence(session, args);
 753 out_success:
 754         rpc_call_start(task);
 755         return 0;
 756 out_sleep:
 757         /* Privileged tasks are queued with top priority */
 758         if (args->sa_privileged)
 759                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 760                                 NULL, RPC_PRIORITY_PRIVILEGED);
 761         else
 762                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 763         spin_unlock(&tbl->slot_tbl_lock);
 764         return -EAGAIN;
 765 }
 766 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 767
 768 static int nfs4_setup_sequence(const struct nfs_server *server,
 769                                struct nfs4_sequence_args *args,
 770                                struct nfs4_sequence_res *res,
 771                                struct rpc_task *task)
 772 {
 773         struct nfs4_session *session = nfs4_get_session(server);
 774         int ret = 0;
 775
 776         if (!session)
 777                 return nfs40_setup_sequence(server, args, res, task);
 778
 779         dprintk("--> %s clp %p session %p sr_slot %u\n",
 780                 __func__, session->clp, session, res->sr_slot ?
 781                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 782
 783         ret = nfs41_setup_sequence(session, args, res, task);
 784
 785         dprintk("<-- %s status=%d\n", __func__, ret);
 786         return ret;
 787 }
 788
 789 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 790 {
 791         struct nfs4_call_sync_data *data = calldata;
 792         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 793
 794         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 795
 796         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 797 }
 798
 799 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_call_sync_data *data = calldata;
 802
 803         nfs41_sequence_done(task, data->seq_res);
 804 }
 805
 806 static const struct rpc_call_ops nfs41_call_sync_ops = {
 807         .rpc_call_prepare = nfs41_call_sync_prepare,
 808         .rpc_call_done = nfs41_call_sync_done,
 809 };
 810
 811 #else   /* !CONFIG_NFS_V4_1 */
 812
 813 static int nfs4_setup_sequence(const struct nfs_server *server,
 814                                struct nfs4_sequence_args *args,
 815                                struct nfs4_sequence_res *res,
 816                                struct rpc_task *task)
 817 {
 818         return nfs40_setup_sequence(server, args, res, task);
 819 }
 820
 821 static int nfs4_sequence_done(struct rpc_task *task,
 822                                struct nfs4_sequence_res *res)
 823 {
 824         return nfs40_sequence_done(task, res);
 825 }
 826
 827 #endif  /* !CONFIG_NFS_V4_1 */
 828
 829 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 830 {
 831         struct nfs4_call_sync_data *data = calldata;
 832         nfs4_setup_sequence(data->seq_server,
 833                                 data->seq_args, data->seq_res, task);
 834 }
 835
 836 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 837 {
 838         struct nfs4_call_sync_data *data = calldata;
 839         nfs4_sequence_done(task, data->seq_res);
 840 }
 841
 842 static const struct rpc_call_ops nfs40_call_sync_ops = {
 843         .rpc_call_prepare = nfs40_call_sync_prepare,
 844         .rpc_call_done = nfs40_call_sync_done,
 845 };
 846
 847 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 848                                    struct nfs_server *server,
 849                                    struct rpc_message *msg,
 850                                    struct nfs4_sequence_args *args,
 851                                    struct nfs4_sequence_res *res)
 852 {
 853         int ret;
 854         struct rpc_task *task;
 855         struct nfs_client *clp = server->nfs_client;
 856         struct nfs4_call_sync_data data = {
 857                 .seq_server = server,
 858                 .seq_args = args,
 859                 .seq_res = res,
 860         };
 861         struct rpc_task_setup task_setup = {
 862                 .rpc_client = clnt,
 863                 .rpc_message = msg,
 864                 .callback_ops = clp->cl_mvops->call_sync_ops,
 865                 .callback_data = &data
 866         };
 867
 868         task = rpc_run_task(&task_setup);
 869         if (IS_ERR(task))
 870                 ret = PTR_ERR(task);
 871         else {
 872                 ret = task->tk_status;
 873                 rpc_put_task(task);
 874         }
 875         return ret;
 876 }
 877
 878 static
 879 int nfs4_call_sync(struct rpc_clnt *clnt,
 880                    struct nfs_server *server,
 881                    struct rpc_message *msg,
 882                    struct nfs4_sequence_args *args,
 883                    struct nfs4_sequence_res *res,
 884                    int cache_reply)
 885 {
 886         nfs4_init_sequence(args, res, cache_reply);
 887         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 888 }
 889
 890 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 891 {
 892         struct nfs_inode *nfsi = NFS_I(dir);
 893
 894         spin_lock(&dir->i_lock);
 895         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 896         if (!cinfo->atomic || cinfo->before != dir->i_version)
 897                 nfs_force_lookup_revalidate(dir);
 898         dir->i_version = cinfo->after;
 899         nfs_fscache_invalidate(dir);
 900         spin_unlock(&dir->i_lock);
 901 }
 902
 903 struct nfs4_opendata {
 904         struct kref kref;
 905         struct nfs_openargs o_arg;
 906         struct nfs_openres o_res;
 907         struct nfs_open_confirmargs c_arg;
 908         struct nfs_open_confirmres c_res;
 909         struct nfs4_string owner_name;
 910         struct nfs4_string group_name;
 911         struct nfs_fattr f_attr;
 912         struct nfs4_label *f_label;
 913         struct dentry *dir;
 914         struct dentry *dentry;
 915         struct nfs4_state_owner *owner;
 916         struct nfs4_state *state;
 917         struct iattr attrs;
 918         unsigned long timestamp;
 919         unsigned int rpc_done : 1;
 920         unsigned int file_created : 1;
 921         unsigned int is_recover : 1;
 922         int rpc_status;
 923         int cancelled;
 924 };
 925
 926 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 927                 int err, struct nfs4_exception *exception)
 928 {
 929         if (err != -EINVAL)
 930                 return false;
 931         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 932                 return false;
 933         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 934         exception->retry = 1;
 935         return true;
 936 }
 937
 938 static enum open_claim_type4
 939 nfs4_map_atomic_open_claim(struct nfs_server *server,
 940                 enum open_claim_type4 claim)
 941 {
 942         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 943                 return claim;
 944         switch (claim) {
 945         default:
 946                 return claim;
 947         case NFS4_OPEN_CLAIM_FH:
 948                 return NFS4_OPEN_CLAIM_NULL;
 949         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 950                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 951         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 952                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 953         }
 954 }
 955
 956 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 957 {
 958         p->o_res.f_attr = &p->f_attr;
 959         p->o_res.f_label = p->f_label;
 960         p->o_res.seqid = p->o_arg.seqid;
 961         p->c_res.seqid = p->c_arg.seqid;
 962         p->o_res.server = p->o_arg.server;
 963         p->o_res.access_request = p->o_arg.access;
 964         nfs_fattr_init(&p->f_attr);
 965         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 966 }
 967
 968 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 969                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 970                 const struct iattr *attrs,
 971                 struct nfs4_label *label,
 972                 enum open_claim_type4 claim,
 973                 gfp_t gfp_mask)
 974 {
 975         struct dentry *parent = dget_parent(dentry);
 976         struct inode *dir = parent->d_inode;
 977         struct nfs_server *server = NFS_SERVER(dir);
 978         struct nfs4_opendata *p;
 979
 980         p = kzalloc(sizeof(*p), gfp_mask);
 981         if (p == NULL)
 982                 goto err;
 983
 984         p->f_label = nfs4_label_alloc(server, gfp_mask);
 985         if (IS_ERR(p->f_label))
 986                 goto err_free_p;
 987
 988         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 989         if (p->o_arg.seqid == NULL)
 990                 goto err_free_label;
 991         nfs_sb_active(dentry->d_sb);
 992         p->dentry = dget(dentry);
 993         p->dir = parent;
 994         p->owner = sp;
 995         atomic_inc(&sp->so_count);
 996         p->o_arg.open_flags = flags;
 997         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 998         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 999          * will return permission denied for all bits until close */
1000         if (!(flags & O_EXCL)) {
1001                 /* ask server to check for all possible rights as results
1002                  * are cached */
1003                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1004                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1005         }
1006         p->o_arg.clientid = server->nfs_client->cl_clientid;
1007         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1008         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1009         p->o_arg.name = &dentry->d_name;
1010         p->o_arg.server = server;
1011         p->o_arg.bitmask = nfs4_bitmask(server, label);
1012         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1013         p->o_arg.label = label;
1014         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1015         switch (p->o_arg.claim) {
1016         case NFS4_OPEN_CLAIM_NULL:
1017         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1018         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1019                 p->o_arg.fh = NFS_FH(dir);
1020                 break;
1021         case NFS4_OPEN_CLAIM_PREVIOUS:
1022         case NFS4_OPEN_CLAIM_FH:
1023         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1024         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1025                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1026         }
1027         if (attrs != NULL && attrs->ia_valid != 0) {
1028                 __u32 verf[2];
1029
1030                 p->o_arg.u.attrs = &p->attrs;
1031                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1032
1033                 verf[0] = jiffies;
1034                 verf[1] = current->pid;
1035                 memcpy(p->o_arg.u.verifier.data, verf,
1036                                 sizeof(p->o_arg.u.verifier.data));
1037         }
1038         p->c_arg.fh = &p->o_res.fh;
1039         p->c_arg.stateid = &p->o_res.stateid;
1040         p->c_arg.seqid = p->o_arg.seqid;
1041         nfs4_init_opendata_res(p);
1042         kref_init(&p->kref);
1043         return p;
1044
1045 err_free_label:
1046         nfs4_label_free(p->f_label);
1047 err_free_p:
1048         kfree(p);
1049 err:
1050         dput(parent);
1051         return NULL;
1052 }
1053
1054 static void nfs4_opendata_free(struct kref *kref)
1055 {
1056         struct nfs4_opendata *p = container_of(kref,
1057                         struct nfs4_opendata, kref);
1058         struct super_block *sb = p->dentry->d_sb;
1059
1060         nfs_free_seqid(p->o_arg.seqid);
1061         if (p->state != NULL)
1062                 nfs4_put_open_state(p->state);
1063         nfs4_put_state_owner(p->owner);
1064
1065         nfs4_label_free(p->f_label);
1066
1067         dput(p->dir);
1068         dput(p->dentry);
1069         nfs_sb_deactive(sb);
1070         nfs_fattr_free_names(&p->f_attr);
1071         kfree(p->f_attr.mdsthreshold);
1072         kfree(p);
1073 }
1074
1075 static void nfs4_opendata_put(struct nfs4_opendata *p)
1076 {
1077         if (p != NULL)
1078                 kref_put(&p->kref, nfs4_opendata_free);
1079 }
1080
1081 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1082 {
1083         int ret;
1084
1085         ret = rpc_wait_for_completion_task(task);
1086         return ret;
1087 }
1088
1089 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1090 {
1091         int ret = 0;
1092
1093         if (open_mode & (O_EXCL|O_TRUNC))
1094                 goto out;
1095         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1096                 case FMODE_READ:
1097                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1098                                 && state->n_rdonly != 0;
1099                         break;
1100                 case FMODE_WRITE:
1101                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1102                                 && state->n_wronly != 0;
1103                         break;
1104                 case FMODE_READ|FMODE_WRITE:
1105                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1106                                 && state->n_rdwr != 0;
1107         }
1108 out:
1109         return ret;
1110 }
1111
1112 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1113 {
1114         if (delegation == NULL)
1115                 return 0;
1116         if ((delegation->type & fmode) != fmode)
1117                 return 0;
1118         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1119                 return 0;
1120         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1121                 return 0;
1122         nfs_mark_delegation_referenced(delegation);
1123         return 1;
1124 }
1125
1126 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1127 {
1128         switch (fmode) {
1129                 case FMODE_WRITE:
1130                         state->n_wronly++;
1131                         break;
1132                 case FMODE_READ:
1133                         state->n_rdonly++;
1134                         break;
1135                 case FMODE_READ|FMODE_WRITE:
1136                         state->n_rdwr++;
1137         }
1138         nfs4_state_set_mode_locked(state, state->state | fmode);
1139 }
1140
1141 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1142 {
1143         struct nfs_client *clp = state->owner->so_server->nfs_client;
1144         bool need_recover = false;
1145
1146         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1147                 need_recover = true;
1148         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1149                 need_recover = true;
1150         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1151                 need_recover = true;
1152         if (need_recover)
1153                 nfs4_state_mark_reclaim_nograce(clp, state);
1154 }
1155
1156 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1157                 nfs4_stateid *stateid)
1158 {
1159         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1160                 return true;
1161         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1162                 nfs_test_and_clear_all_open_stateid(state);
1163                 return true;
1164         }
1165         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1166                 return true;
1167         return false;
1168 }
1169
1170 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1171                 nfs4_stateid *stateid, fmode_t fmode)
1172 {
1173         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1174         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1175         case FMODE_WRITE:
1176                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1177                 break;
1178         case FMODE_READ:
1179                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1180                 break;
1181         case 0:
1182                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1183                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1184                 clear_bit(NFS_OPEN_STATE, &state->flags);
1185         }
1186         if (stateid == NULL)
1187                 return;
1188         if (!nfs_need_update_open_stateid(state, stateid))
1189                 return;
1190         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1191                 nfs4_stateid_copy(&state->stateid, stateid);
1192         nfs4_stateid_copy(&state->open_stateid, stateid);
1193 }
1194
1195 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1196 {
1197         write_seqlock(&state->seqlock);
1198         nfs_clear_open_stateid_locked(state, stateid, fmode);
1199         write_sequnlock(&state->seqlock);
1200         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1201                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1202 }
1203
1204 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1205 {
1206         switch (fmode) {
1207                 case FMODE_READ:
1208                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1209                         break;
1210                 case FMODE_WRITE:
1211                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1212                         break;
1213                 case FMODE_READ|FMODE_WRITE:
1214                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1215         }
1216         if (!nfs_need_update_open_stateid(state, stateid))
1217                 return;
1218         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1219                 nfs4_stateid_copy(&state->stateid, stateid);
1220         nfs4_stateid_copy(&state->open_stateid, stateid);
1221 }
1222
1223 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1224 {
1225         /*
1226          * Protect the call to nfs4_state_set_mode_locked and
1227          * serialise the stateid update
1228          */
1229         write_seqlock(&state->seqlock);
1230         if (deleg_stateid != NULL) {
1231                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1232                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1233         }
1234         if (open_stateid != NULL)
1235                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1236         write_sequnlock(&state->seqlock);
1237         spin_lock(&state->owner->so_lock);
1238         update_open_stateflags(state, fmode);
1239         spin_unlock(&state->owner->so_lock);
1240 }
1241
1242 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1243 {
1244         struct nfs_inode *nfsi = NFS_I(state->inode);
1245         struct nfs_delegation *deleg_cur;
1246         int ret = 0;
1247
1248         fmode &= (FMODE_READ|FMODE_WRITE);
1249
1250         rcu_read_lock();
1251         deleg_cur = rcu_dereference(nfsi->delegation);
1252         if (deleg_cur == NULL)
1253                 goto no_delegation;
1254
1255         spin_lock(&deleg_cur->lock);
1256         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1257            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1258             (deleg_cur->type & fmode) != fmode)
1259                 goto no_delegation_unlock;
1260
1261         if (delegation == NULL)
1262                 delegation = &deleg_cur->stateid;
1263         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1264                 goto no_delegation_unlock;
1265
1266         nfs_mark_delegation_referenced(deleg_cur);
1267         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1268         ret = 1;
1269 no_delegation_unlock:
1270         spin_unlock(&deleg_cur->lock);
1271 no_delegation:
1272         rcu_read_unlock();
1273
1274         if (!ret && open_stateid != NULL) {
1275                 __update_open_stateid(state, open_stateid, NULL, fmode);
1276                 ret = 1;
1277         }
1278         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1279                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1280
1281         return ret;
1282 }
1283
1284
1285 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1286 {
1287         struct nfs_delegation *delegation;
1288
1289         rcu_read_lock();
1290         delegation = rcu_dereference(NFS_I(inode)->delegation);
1291         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1292                 rcu_read_unlock();
1293                 return;
1294         }
1295         rcu_read_unlock();
1296         nfs4_inode_return_delegation(inode);
1297 }
1298
1299 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1300 {
1301         struct nfs4_state *state = opendata->state;
1302         struct nfs_inode *nfsi = NFS_I(state->inode);
1303         struct nfs_delegation *delegation;
1304         int open_mode = opendata->o_arg.open_flags;
1305         fmode_t fmode = opendata->o_arg.fmode;
1306         nfs4_stateid stateid;
1307         int ret = -EAGAIN;
1308
1309         for (;;) {
1310                 spin_lock(&state->owner->so_lock);
1311                 if (can_open_cached(state, fmode, open_mode)) {
1312                         update_open_stateflags(state, fmode);
1313                         spin_unlock(&state->owner->so_lock);
1314                         goto out_return_state;
1315                 }
1316                 spin_unlock(&state->owner->so_lock);
1317                 rcu_read_lock();
1318                 delegation = rcu_dereference(nfsi->delegation);
1319                 if (!can_open_delegated(delegation, fmode)) {
1320                         rcu_read_unlock();
1321                         break;
1322                 }
1323                 /* Save the delegation */
1324                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1325                 rcu_read_unlock();
1326                 nfs_release_seqid(opendata->o_arg.seqid);
1327                 if (!opendata->is_recover) {
1328                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1329                         if (ret != 0)
1330                                 goto out;
1331                 }
1332                 ret = -EAGAIN;
1333
1334                 /* Try to update the stateid using the delegation */
1335                 if (update_open_stateid(state, NULL, &stateid, fmode))
1336                         goto out_return_state;
1337         }
1338 out:
1339         return ERR_PTR(ret);
1340 out_return_state:
1341         atomic_inc(&state->count);
1342         return state;
1343 }
1344
1345 static void
1346 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1347 {
1348         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1349         struct nfs_delegation *delegation;
1350         int delegation_flags = 0;
1351
1352         rcu_read_lock();
1353         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1354         if (delegation)
1355                 delegation_flags = delegation->flags;
1356         rcu_read_unlock();
1357         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1358                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1359                                    "returning a delegation for "
1360                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1361                                    clp->cl_hostname);
1362         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1363                 nfs_inode_set_delegation(state->inode,
1364                                          data->owner->so_cred,
1365                                          &data->o_res);
1366         else
1367                 nfs_inode_reclaim_delegation(state->inode,
1368                                              data->owner->so_cred,
1369                                              &data->o_res);
1370 }
1371
1372 /*
1373  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1374  * and update the nfs4_state.
1375  */
1376 static struct nfs4_state *
1377 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1378 {
1379         struct inode *inode = data->state->inode;
1380         struct nfs4_state *state = data->state;
1381         int ret;
1382
1383         if (!data->rpc_done) {
1384                 if (data->rpc_status) {
1385                         ret = data->rpc_status;
1386                         goto err;
1387                 }
1388                 /* cached opens have already been processed */
1389                 goto update;
1390         }
1391
1392         ret = nfs_refresh_inode(inode, &data->f_attr);
1393         if (ret)
1394                 goto err;
1395
1396         if (data->o_res.delegation_type != 0)
1397                 nfs4_opendata_check_deleg(data, state);
1398 update:
1399         update_open_stateid(state, &data->o_res.stateid, NULL,
1400                             data->o_arg.fmode);
1401         atomic_inc(&state->count);
1402
1403         return state;
1404 err:
1405         return ERR_PTR(ret);
1406
1407 }
1408
1409 static struct nfs4_state *
1410 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1411 {
1412         struct inode *inode;
1413         struct nfs4_state *state = NULL;
1414         int ret;
1415
1416         if (!data->rpc_done) {
1417                 state = nfs4_try_open_cached(data);
1418                 goto out;
1419         }
1420
1421         ret = -EAGAIN;
1422         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1423                 goto err;
1424         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1425         ret = PTR_ERR(inode);
1426         if (IS_ERR(inode))
1427                 goto err;
1428         ret = -ENOMEM;
1429         state = nfs4_get_open_state(inode, data->owner);
1430         if (state == NULL)
1431                 goto err_put_inode;
1432         if (data->o_res.delegation_type != 0)
1433                 nfs4_opendata_check_deleg(data, state);
1434         update_open_stateid(state, &data->o_res.stateid, NULL,
1435                         data->o_arg.fmode);
1436         iput(inode);
1437 out:
1438         nfs_release_seqid(data->o_arg.seqid);
1439         return state;
1440 err_put_inode:
1441         iput(inode);
1442 err:
1443         return ERR_PTR(ret);
1444 }
1445
1446 static struct nfs4_state *
1447 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1448 {
1449         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1450                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1451         return _nfs4_opendata_to_nfs4_state(data);
1452 }
1453
1454 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1455 {
1456         struct nfs_inode *nfsi = NFS_I(state->inode);
1457         struct nfs_open_context *ctx;
1458
1459         spin_lock(&state->inode->i_lock);
1460         list_for_each_entry(ctx, &nfsi->open_files, list) {
1461                 if (ctx->state != state)
1462                         continue;
1463                 get_nfs_open_context(ctx);
1464                 spin_unlock(&state->inode->i_lock);
1465                 return ctx;
1466         }
1467         spin_unlock(&state->inode->i_lock);
1468         return ERR_PTR(-ENOENT);
1469 }
1470
1471 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1472                 struct nfs4_state *state, enum open_claim_type4 claim)
1473 {
1474         struct nfs4_opendata *opendata;
1475
1476         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1477                         NULL, NULL, claim, GFP_NOFS);
1478         if (opendata == NULL)
1479                 return ERR_PTR(-ENOMEM);
1480         opendata->state = state;
1481         atomic_inc(&state->count);
1482         return opendata;
1483 }
1484
1485 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1486 {
1487         struct nfs4_state *newstate;
1488         int ret;
1489
1490         opendata->o_arg.open_flags = 0;
1491         opendata->o_arg.fmode = fmode;
1492         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1493         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1494         nfs4_init_opendata_res(opendata);
1495         ret = _nfs4_recover_proc_open(opendata);
1496         if (ret != 0)
1497                 return ret;
1498         newstate = nfs4_opendata_to_nfs4_state(opendata);
1499         if (IS_ERR(newstate))
1500                 return PTR_ERR(newstate);
1501         nfs4_close_state(newstate, fmode);
1502         *res = newstate;
1503         return 0;
1504 }
1505
1506 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1507 {
1508         struct nfs4_state *newstate;
1509         int ret;
1510
1511         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1512         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1513         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1514         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1515         /* memory barrier prior to reading state->n_* */
1516         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1517         clear_bit(NFS_OPEN_STATE, &state->flags);
1518         smp_rmb();
1519         if (state->n_rdwr != 0) {
1520                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1521                 if (ret != 0)
1522                         return ret;
1523                 if (newstate != state)
1524                         return -ESTALE;
1525         }
1526         if (state->n_wronly != 0) {
1527                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1528                 if (ret != 0)
1529                         return ret;
1530                 if (newstate != state)
1531                         return -ESTALE;
1532         }
1533         if (state->n_rdonly != 0) {
1534                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1535                 if (ret != 0)
1536                         return ret;
1537                 if (newstate != state)
1538                         return -ESTALE;
1539         }
1540         /*
1541          * We may have performed cached opens for all three recoveries.
1542          * Check if we need to update the current stateid.
1543          */
1544         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1545             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1546                 write_seqlock(&state->seqlock);
1547                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1548                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1549                 write_sequnlock(&state->seqlock);
1550         }
1551         return 0;
1552 }
1553
1554 /*
1555  * OPEN_RECLAIM:
1556  *      reclaim state on the server after a reboot.
1557  */
1558 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1559 {
1560         struct nfs_delegation *delegation;
1561         struct nfs4_opendata *opendata;
1562         fmode_t delegation_type = 0;
1563         int status;
1564
1565         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1566                         NFS4_OPEN_CLAIM_PREVIOUS);
1567         if (IS_ERR(opendata))
1568                 return PTR_ERR(opendata);
1569         rcu_read_lock();
1570         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1571         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1572                 delegation_type = delegation->type;
1573         rcu_read_unlock();
1574         opendata->o_arg.u.delegation_type = delegation_type;
1575         status = nfs4_open_recover(opendata, state);
1576         nfs4_opendata_put(opendata);
1577         return status;
1578 }
1579
1580 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1581 {
1582         struct nfs_server *server = NFS_SERVER(state->inode);
1583         struct nfs4_exception exception = { };
1584         int err;
1585         do {
1586                 err = _nfs4_do_open_reclaim(ctx, state);
1587                 trace_nfs4_open_reclaim(ctx, 0, err);
1588                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1589                         continue;
1590                 if (err != -NFS4ERR_DELAY)
1591                         break;
1592                 nfs4_handle_exception(server, err, &exception);
1593         } while (exception.retry);
1594         return err;
1595 }
1596
1597 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1598 {
1599         struct nfs_open_context *ctx;
1600         int ret;
1601
1602         ctx = nfs4_state_find_open_context(state);
1603         if (IS_ERR(ctx))
1604                 return -EAGAIN;
1605         ret = nfs4_do_open_reclaim(ctx, state);
1606         put_nfs_open_context(ctx);
1607         return ret;
1608 }
1609
1610 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1611 {
1612         switch (err) {
1613                 default:
1614                         printk(KERN_ERR "NFS: %s: unhandled error "
1615                                         "%d.\n", __func__, err);
1616                 case 0:
1617                 case -ENOENT:
1618                 case -ESTALE:
1619                         break;
1620                 case -NFS4ERR_BADSESSION:
1621                 case -NFS4ERR_BADSLOT:
1622                 case -NFS4ERR_BAD_HIGH_SLOT:
1623                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1624                 case -NFS4ERR_DEADSESSION:
1625                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1626                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1627                         return -EAGAIN;
1628                 case -NFS4ERR_STALE_CLIENTID:
1629                 case -NFS4ERR_STALE_STATEID:
1630                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1631                 case -NFS4ERR_EXPIRED:
1632                         /* Don't recall a delegation if it was lost */
1633                         nfs4_schedule_lease_recovery(server->nfs_client);
1634                         return -EAGAIN;
1635                 case -NFS4ERR_MOVED:
1636                         nfs4_schedule_migration_recovery(server);
1637                         return -EAGAIN;
1638                 case -NFS4ERR_LEASE_MOVED:
1639                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1640                         return -EAGAIN;
1641                 case -NFS4ERR_DELEG_REVOKED:
1642                 case -NFS4ERR_ADMIN_REVOKED:
1643                 case -NFS4ERR_BAD_STATEID:
1644                 case -NFS4ERR_OPENMODE:
1645                         nfs_inode_find_state_and_recover(state->inode,
1646                                         stateid);
1647                         nfs4_schedule_stateid_recovery(server, state);
1648                         return 0;
1649                 case -NFS4ERR_DELAY:
1650                 case -NFS4ERR_GRACE:
1651                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1652                         ssleep(1);
1653                         return -EAGAIN;
1654                 case -ENOMEM:
1655                 case -NFS4ERR_DENIED:
1656                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1657                         return 0;
1658         }
1659         return err;
1660 }
1661
1662 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1663 {
1664         struct nfs_server *server = NFS_SERVER(state->inode);
1665         struct nfs4_opendata *opendata;
1666         int err;
1667
1668         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1669                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1670         if (IS_ERR(opendata))
1671                 return PTR_ERR(opendata);
1672         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1673         err = nfs4_open_recover(opendata, state);
1674         nfs4_opendata_put(opendata);
1675         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1676 }
1677
1678 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1679 {
1680         struct nfs4_opendata *data = calldata;
1681
1682         nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1683                                 &data->c_res.seq_res, task);
1684 }
1685
1686 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1687 {
1688         struct nfs4_opendata *data = calldata;
1689
1690         nfs40_sequence_done(task, &data->c_res.seq_res);
1691
1692         data->rpc_status = task->tk_status;
1693         if (data->rpc_status == 0) {
1694                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1695                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1696                 renew_lease(data->o_res.server, data->timestamp);
1697                 data->rpc_done = 1;
1698         }
1699 }
1700
1701 static void nfs4_open_confirm_release(void *calldata)
1702 {
1703         struct nfs4_opendata *data = calldata;
1704         struct nfs4_state *state = NULL;
1705
1706         /* If this request hasn't been cancelled, do nothing */
1707         if (data->cancelled == 0)
1708                 goto out_free;
1709         /* In case of error, no cleanup! */
1710         if (!data->rpc_done)
1711                 goto out_free;
1712         state = nfs4_opendata_to_nfs4_state(data);
1713         if (!IS_ERR(state))
1714                 nfs4_close_state(state, data->o_arg.fmode);
1715 out_free:
1716         nfs4_opendata_put(data);
1717 }
1718
1719 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1720         .rpc_call_prepare = nfs4_open_confirm_prepare,
1721         .rpc_call_done = nfs4_open_confirm_done,
1722         .rpc_release = nfs4_open_confirm_release,
1723 };
1724
1725 /*
1726  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1727  */
1728 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1729 {
1730         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1731         struct rpc_task *task;
1732         struct  rpc_message msg = {
1733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1734                 .rpc_argp = &data->c_arg,
1735                 .rpc_resp = &data->c_res,
1736                 .rpc_cred = data->owner->so_cred,
1737         };
1738         struct rpc_task_setup task_setup_data = {
1739                 .rpc_client = server->client,
1740                 .rpc_message = &msg,
1741                 .callback_ops = &nfs4_open_confirm_ops,
1742                 .callback_data = data,
1743                 .workqueue = nfsiod_workqueue,
1744                 .flags = RPC_TASK_ASYNC,
1745         };
1746         int status;
1747
1748         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1749         kref_get(&data->kref);
1750         data->rpc_done = 0;
1751         data->rpc_status = 0;
1752         data->timestamp = jiffies;
1753         task = rpc_run_task(&task_setup_data);
1754         if (IS_ERR(task))
1755                 return PTR_ERR(task);
1756         status = nfs4_wait_for_completion_rpc_task(task);
1757         if (status != 0) {
1758                 data->cancelled = 1;
1759                 smp_wmb();
1760         } else
1761                 status = data->rpc_status;
1762         rpc_put_task(task);
1763         return status;
1764 }
1765
1766 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1767 {
1768         struct nfs4_opendata *data = calldata;
1769         struct nfs4_state_owner *sp = data->owner;
1770         struct nfs_client *clp = sp->so_server->nfs_client;
1771
1772         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1773                 goto out_wait;
1774         /*
1775          * Check if we still need to send an OPEN call, or if we can use
1776          * a delegation instead.
1777          */
1778         if (data->state != NULL) {
1779                 struct nfs_delegation *delegation;
1780
1781                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1782                         goto out_no_action;
1783                 rcu_read_lock();
1784                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1785                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1786                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1787                     can_open_delegated(delegation, data->o_arg.fmode))
1788                         goto unlock_no_action;
1789                 rcu_read_unlock();
1790         }
1791         /* Update client id. */
1792         data->o_arg.clientid = clp->cl_clientid;
1793         switch (data->o_arg.claim) {
1794         case NFS4_OPEN_CLAIM_PREVIOUS:
1795         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1796         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1797                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1798         case NFS4_OPEN_CLAIM_FH:
1799                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1800                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1801         }
1802         data->timestamp = jiffies;
1803         if (nfs4_setup_sequence(data->o_arg.server,
1804                                 &data->o_arg.seq_args,
1805                                 &data->o_res.seq_res,
1806                                 task) != 0)
1807                 nfs_release_seqid(data->o_arg.seqid);
1808
1809         /* Set the create mode (note dependency on the session type) */
1810         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1811         if (data->o_arg.open_flags & O_EXCL) {
1812                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1813                 if (nfs4_has_persistent_session(clp))
1814                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1815                 else if (clp->cl_mvops->minor_version > 0)
1816                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1817         }
1818         return;
1819 unlock_no_action:
1820         rcu_read_unlock();
1821 out_no_action:
1822         task->tk_action = NULL;
1823 out_wait:
1824         nfs4_sequence_done(task, &data->o_res.seq_res);
1825 }
1826
1827 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1828 {
1829         struct nfs4_opendata *data = calldata;
1830
1831         data->rpc_status = task->tk_status;
1832
1833         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1834                 return;
1835
1836         if (task->tk_status == 0) {
1837                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1838                         switch (data->o_res.f_attr->mode & S_IFMT) {
1839                         case S_IFREG:
1840                                 break;
1841                         case S_IFLNK:
1842                                 data->rpc_status = -ELOOP;
1843                                 break;
1844                         case S_IFDIR:
1845                                 data->rpc_status = -EISDIR;
1846                                 break;
1847                         default:
1848                                 data->rpc_status = -ENOTDIR;
1849                         }
1850                 }
1851                 renew_lease(data->o_res.server, data->timestamp);
1852                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1853                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1854         }
1855         data->rpc_done = 1;
1856 }
1857
1858 static void nfs4_open_release(void *calldata)
1859 {
1860         struct nfs4_opendata *data = calldata;
1861         struct nfs4_state *state = NULL;
1862
1863         /* If this request hasn't been cancelled, do nothing */
1864         if (data->cancelled == 0)
1865                 goto out_free;
1866         /* In case of error, no cleanup! */
1867         if (data->rpc_status != 0 || !data->rpc_done)
1868                 goto out_free;
1869         /* In case we need an open_confirm, no cleanup! */
1870         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1871                 goto out_free;
1872         state = nfs4_opendata_to_nfs4_state(data);
1873         if (!IS_ERR(state))
1874                 nfs4_close_state(state, data->o_arg.fmode);
1875 out_free:
1876         nfs4_opendata_put(data);
1877 }
1878
1879 static const struct rpc_call_ops nfs4_open_ops = {
1880         .rpc_call_prepare = nfs4_open_prepare,
1881         .rpc_call_done = nfs4_open_done,
1882         .rpc_release = nfs4_open_release,
1883 };
1884
1885 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1886 {
1887         struct inode *dir = data->dir->d_inode;
1888         struct nfs_server *server = NFS_SERVER(dir);
1889         struct nfs_openargs *o_arg = &data->o_arg;
1890         struct nfs_openres *o_res = &data->o_res;
1891         struct rpc_task *task;
1892         struct rpc_message msg = {
1893                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1894                 .rpc_argp = o_arg,
1895                 .rpc_resp = o_res,
1896                 .rpc_cred = data->owner->so_cred,
1897         };
1898         struct rpc_task_setup task_setup_data = {
1899                 .rpc_client = server->client,
1900                 .rpc_message = &msg,
1901                 .callback_ops = &nfs4_open_ops,
1902                 .callback_data = data,
1903                 .workqueue = nfsiod_workqueue,
1904                 .flags = RPC_TASK_ASYNC,
1905         };
1906         int status;
1907
1908         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1909         kref_get(&data->kref);
1910         data->rpc_done = 0;
1911         data->rpc_status = 0;
1912         data->cancelled = 0;
1913         data->is_recover = 0;
1914         if (isrecover) {
1915                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1916                 data->is_recover = 1;
1917         }
1918         task = rpc_run_task(&task_setup_data);
1919         if (IS_ERR(task))
1920                 return PTR_ERR(task);
1921         status = nfs4_wait_for_completion_rpc_task(task);
1922         if (status != 0) {
1923                 data->cancelled = 1;
1924                 smp_wmb();
1925         } else
1926                 status = data->rpc_status;
1927         rpc_put_task(task);
1928
1929         return status;
1930 }
1931
1932 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1933 {
1934         struct inode *dir = data->dir->d_inode;
1935         struct nfs_openres *o_res = &data->o_res;
1936         int status;
1937
1938         status = nfs4_run_open_task(data, 1);
1939         if (status != 0 || !data->rpc_done)
1940                 return status;
1941
1942         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1943
1944         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1945                 status = _nfs4_proc_open_confirm(data);
1946                 if (status != 0)
1947                         return status;
1948         }
1949
1950         return status;
1951 }
1952
1953 /*
1954  * Additional permission checks in order to distinguish between an
1955  * open for read, and an open for execute. This works around the
1956  * fact that NFSv4 OPEN treats read and execute permissions as being
1957  * the same.
1958  * Note that in the non-execute case, we want to turn off permission
1959  * checking if we just created a new file (POSIX open() semantics).
1960  */
1961 static int nfs4_opendata_access(struct rpc_cred *cred,
1962                                 struct nfs4_opendata *opendata,
1963                                 struct nfs4_state *state, fmode_t fmode,
1964                                 int openflags)
1965 {
1966         struct nfs_access_entry cache;
1967         u32 mask;
1968
1969         /* access call failed or for some reason the server doesn't
1970          * support any access modes -- defer access call until later */
1971         if (opendata->o_res.access_supported == 0)
1972                 return 0;
1973
1974         mask = 0;
1975         /*
1976          * Use openflags to check for exec, because fmode won't
1977          * always have FMODE_EXEC set when file open for exec.
1978          */
1979         if (openflags & __FMODE_EXEC) {
1980                 /* ONLY check for exec rights */
1981                 mask = MAY_EXEC;
1982         } else if ((fmode & FMODE_READ) && !opendata->file_created)
1983                 mask = MAY_READ;
1984
1985         cache.cred = cred;
1986         cache.jiffies = jiffies;
1987         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1988         nfs_access_add_cache(state->inode, &cache);
1989
1990         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1991                 return 0;
1992
1993         /* even though OPEN succeeded, access is denied. Close the file */
1994         nfs4_close_state(state, fmode);
1995         return -EACCES;
1996 }
1997
1998 /*
1999  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2000  */
2001 static int _nfs4_proc_open(struct nfs4_opendata *data)
2002 {
2003         struct inode *dir = data->dir->d_inode;
2004         struct nfs_server *server = NFS_SERVER(dir);
2005         struct nfs_openargs *o_arg = &data->o_arg;
2006         struct nfs_openres *o_res = &data->o_res;
2007         int status;
2008
2009         status = nfs4_run_open_task(data, 0);
2010         if (!data->rpc_done)
2011                 return status;
2012         if (status != 0) {
2013                 if (status == -NFS4ERR_BADNAME &&
2014                                 !(o_arg->open_flags & O_CREAT))
2015                         return -ENOENT;
2016                 return status;
2017         }
2018
2019         nfs_fattr_map_and_free_names(server, &data->f_attr);
2020
2021         if (o_arg->open_flags & O_CREAT) {
2022                 update_changeattr(dir, &o_res->cinfo);
2023                 if (o_arg->open_flags & O_EXCL)
2024                         data->file_created = 1;
2025                 else if (o_res->cinfo.before != o_res->cinfo.after)
2026                         data->file_created = 1;
2027         }
2028         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2029                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2030         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2031                 status = _nfs4_proc_open_confirm(data);
2032                 if (status != 0)
2033                         return status;
2034         }
2035         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2036                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2037         return 0;
2038 }
2039
2040 static int nfs4_recover_expired_lease(struct nfs_server *server)
2041 {
2042         return nfs4_client_recover_expired_lease(server->nfs_client);
2043 }
2044
2045 /*
2046  * OPEN_EXPIRED:
2047  *      reclaim state on the server after a network partition.
2048  *      Assumes caller holds the appropriate lock
2049  */
2050 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2051 {
2052         struct nfs4_opendata *opendata;
2053         int ret;
2054
2055         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2056                         NFS4_OPEN_CLAIM_FH);
2057         if (IS_ERR(opendata))
2058                 return PTR_ERR(opendata);
2059         ret = nfs4_open_recover(opendata, state);
2060         if (ret == -ESTALE)
2061                 d_drop(ctx->dentry);
2062         nfs4_opendata_put(opendata);
2063         return ret;
2064 }
2065
2066 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2067 {
2068         struct nfs_server *server = NFS_SERVER(state->inode);
2069         struct nfs4_exception exception = { };
2070         int err;
2071
2072         do {
2073                 err = _nfs4_open_expired(ctx, state);
2074                 trace_nfs4_open_expired(ctx, 0, err);
2075                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2076                         continue;
2077                 switch (err) {
2078                 default:
2079                         goto out;
2080                 case -NFS4ERR_GRACE:
2081                 case -NFS4ERR_DELAY:
2082                         nfs4_handle_exception(server, err, &exception);
2083                         err = 0;
2084                 }
2085         } while (exception.retry);
2086 out:
2087         return err;
2088 }
2089
2090 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2091 {
2092         struct nfs_open_context *ctx;
2093         int ret;
2094
2095         ctx = nfs4_state_find_open_context(state);
2096         if (IS_ERR(ctx))
2097                 return -EAGAIN;
2098         ret = nfs4_do_open_expired(ctx, state);
2099         put_nfs_open_context(ctx);
2100         return ret;
2101 }
2102
2103 #if defined(CONFIG_NFS_V4_1)
2104 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2105 {
2106         struct nfs_server *server = NFS_SERVER(state->inode);
2107         nfs4_stateid *stateid = &state->stateid;
2108         struct nfs_delegation *delegation;
2109         struct rpc_cred *cred = NULL;
2110         int status = -NFS4ERR_BAD_STATEID;
2111
2112         /* If a state reset has been done, test_stateid is unneeded */
2113         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2114                 return;
2115
2116         /* Get the delegation credential for use by test/free_stateid */
2117         rcu_read_lock();
2118         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2119         if (delegation != NULL &&
2120             nfs4_stateid_match(&delegation->stateid, stateid)) {
2121                 cred = get_rpccred(delegation->cred);
2122                 rcu_read_unlock();
2123                 status = nfs41_test_stateid(server, stateid, cred);
2124                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2125         } else
2126                 rcu_read_unlock();
2127
2128         if (status != NFS_OK) {
2129                 /* Free the stateid unless the server explicitly
2130                  * informs us the stateid is unrecognized. */
2131                 if (status != -NFS4ERR_BAD_STATEID)
2132                         nfs41_free_stateid(server, stateid, cred);
2133                 nfs_remove_bad_delegation(state->inode);
2134
2135                 write_seqlock(&state->seqlock);
2136                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2137                 write_sequnlock(&state->seqlock);
2138                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2139         }
2140
2141         if (cred != NULL)
2142                 put_rpccred(cred);
2143 }
2144
2145 /**
2146  * nfs41_check_open_stateid - possibly free an open stateid
2147  *
2148  * @state: NFSv4 state for an inode
2149  *
2150  * Returns NFS_OK if recovery for this stateid is now finished.
2151  * Otherwise a negative NFS4ERR value is returned.
2152  */
2153 static int nfs41_check_open_stateid(struct nfs4_state *state)
2154 {
2155         struct nfs_server *server = NFS_SERVER(state->inode);
2156         nfs4_stateid *stateid = &state->open_stateid;
2157         struct rpc_cred *cred = state->owner->so_cred;
2158         int status;
2159
2160         /* If a state reset has been done, test_stateid is unneeded */
2161         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2162             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2163             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2164                 return -NFS4ERR_BAD_STATEID;
2165
2166         status = nfs41_test_stateid(server, stateid, cred);
2167         trace_nfs4_test_open_stateid(state, NULL, status);
2168         if (status != NFS_OK) {
2169                 /* Free the stateid unless the server explicitly
2170                  * informs us the stateid is unrecognized. */
2171                 if (status != -NFS4ERR_BAD_STATEID)
2172                         nfs41_free_stateid(server, stateid, cred);
2173
2174                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2175                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2176                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2177                 clear_bit(NFS_OPEN_STATE, &state->flags);
2178         }
2179         return status;
2180 }
2181
2182 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2183 {
2184         int status;
2185
2186         nfs41_clear_delegation_stateid(state);
2187         status = nfs41_check_open_stateid(state);
2188         if (status != NFS_OK)
2189                 status = nfs4_open_expired(sp, state);
2190         return status;
2191 }
2192 #endif
2193
2194 /*
2195  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2196  * fields corresponding to attributes that were used to store the verifier.
2197  * Make sure we clobber those fields in the later setattr call
2198  */
2199 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2200 {
2201         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2202             !(sattr->ia_valid & ATTR_ATIME_SET))
2203                 sattr->ia_valid |= ATTR_ATIME;
2204
2205         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2206             !(sattr->ia_valid & ATTR_MTIME_SET))
2207                 sattr->ia_valid |= ATTR_MTIME;
2208 }
2209
2210 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2211                 fmode_t fmode,
2212                 int flags,
2213                 struct nfs_open_context *ctx)
2214 {
2215         struct nfs4_state_owner *sp = opendata->owner;
2216         struct nfs_server *server = sp->so_server;
2217         struct dentry *dentry;
2218         struct nfs4_state *state;
2219         unsigned int seq;
2220         int ret;
2221
2222         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2223
2224         ret = _nfs4_proc_open(opendata);
2225         if (ret != 0) {
2226                 if (ret == -ENOENT) {
2227                         d_drop(opendata->dentry);
2228                         d_add(opendata->dentry, NULL);
2229                         nfs_set_verifier(opendata->dentry,
2230                                          nfs_save_change_attribute(opendata->dir->d_inode));
2231                 }
2232                 goto out;
2233         }
2234
2235         state = nfs4_opendata_to_nfs4_state(opendata);
2236         ret = PTR_ERR(state);
2237         if (IS_ERR(state))
2238                 goto out;
2239         if (server->caps & NFS_CAP_POSIX_LOCK)
2240                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2241
2242         dentry = opendata->dentry;
2243         if (dentry->d_inode == NULL) {
2244                 /* FIXME: Is this d_drop() ever needed? */
2245                 d_drop(dentry);
2246                 dentry = d_add_unique(dentry, igrab(state->inode));
2247                 if (dentry == NULL) {
2248                         dentry = opendata->dentry;
2249                 } else if (dentry != ctx->dentry) {
2250                         dput(ctx->dentry);
2251                         ctx->dentry = dget(dentry);
2252                 }
2253                 nfs_set_verifier(dentry,
2254                                 nfs_save_change_attribute(opendata->dir->d_inode));
2255         }
2256
2257         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2258         if (ret != 0)
2259                 goto out;
2260
2261         ctx->state = state;
2262         if (dentry->d_inode == state->inode) {
2263                 nfs_inode_attach_open_context(ctx);
2264                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2265                         nfs4_schedule_stateid_recovery(server, state);
2266         }
2267 out:
2268         return ret;
2269 }
2270
2271 /*
2272  * Returns a referenced nfs4_state
2273  */
2274 static int _nfs4_do_open(struct inode *dir,
2275                         struct nfs_open_context *ctx,
2276                         int flags,
2277                         struct iattr *sattr,
2278                         struct nfs4_label *label,
2279                         int *opened)
2280 {
2281         struct nfs4_state_owner  *sp;
2282         struct nfs4_state     *state = NULL;
2283         struct nfs_server       *server = NFS_SERVER(dir);
2284         struct nfs4_opendata *opendata;
2285         struct dentry *dentry = ctx->dentry;
2286         struct rpc_cred *cred = ctx->cred;
2287         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2288         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2289         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2290         struct nfs4_label *olabel = NULL;
2291         int status;
2292
2293         /* Protect against reboot recovery conflicts */
2294         status = -ENOMEM;
2295         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2296         if (sp == NULL) {
2297                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2298                 goto out_err;
2299         }
2300         status = nfs4_recover_expired_lease(server);
2301         if (status != 0)
2302                 goto err_put_state_owner;
2303         if (dentry->d_inode != NULL)
2304                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2305         status = -ENOMEM;
2306         if (dentry->d_inode)
2307                 claim = NFS4_OPEN_CLAIM_FH;
2308         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2309                         label, claim, GFP_KERNEL);
2310         if (opendata == NULL)
2311                 goto err_put_state_owner;
2312
2313         if (label) {
2314                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2315                 if (IS_ERR(olabel)) {
2316                         status = PTR_ERR(olabel);
2317                         goto err_opendata_put;
2318                 }
2319         }
2320
2321         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2322                 if (!opendata->f_attr.mdsthreshold) {
2323                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2324                         if (!opendata->f_attr.mdsthreshold)
2325                                 goto err_free_label;
2326                 }
2327                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2328         }
2329         if (dentry->d_inode != NULL)
2330                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2331
2332         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2333         if (status != 0)
2334                 goto err_free_label;
2335         state = ctx->state;
2336
2337         if ((opendata->o_arg.open_flags & O_EXCL) &&
2338             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2339                 nfs4_exclusive_attrset(opendata, sattr);
2340
2341                 nfs_fattr_init(opendata->o_res.f_attr);
2342                 status = nfs4_do_setattr(state->inode, cred,
2343                                 opendata->o_res.f_attr, sattr,
2344                                 state, label, olabel);
2345                 if (status == 0) {
2346                         nfs_setattr_update_inode(state->inode, sattr);
2347                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2348                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2349                 }
2350         }
2351         if (opendata->file_created)
2352                 *opened |= FILE_CREATED;
2353
2354         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2355                 *ctx_th = opendata->f_attr.mdsthreshold;
2356                 opendata->f_attr.mdsthreshold = NULL;
2357         }
2358
2359         nfs4_label_free(olabel);
2360
2361         nfs4_opendata_put(opendata);
2362         nfs4_put_state_owner(sp);
2363         return 0;
2364 err_free_label:
2365         nfs4_label_free(olabel);
2366 err_opendata_put:
2367         nfs4_opendata_put(opendata);
2368 err_put_state_owner:
2369         nfs4_put_state_owner(sp);
2370 out_err:
2371         return status;
2372 }
2373
2374
2375 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2376                                         struct nfs_open_context *ctx,
2377                                         int flags,
2378                                         struct iattr *sattr,
2379                                         struct nfs4_label *label,
2380                                         int *opened)
2381 {
2382         struct nfs_server *server = NFS_SERVER(dir);
2383         struct nfs4_exception exception = { };
2384         struct nfs4_state *res;
2385         int status;
2386
2387         do {
2388                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2389                 res = ctx->state;
2390                 trace_nfs4_open_file(ctx, flags, status);
2391                 if (status == 0)
2392                         break;
2393                 /* NOTE: BAD_SEQID means the server and client disagree about the
2394                  * book-keeping w.r.t. state-changing operations
2395                  * (OPEN/CLOSE/LOCK/LOCKU...)
2396                  * It is actually a sign of a bug on the client or on the server.
2397                  *
2398                  * If we receive a BAD_SEQID error in the particular case of
2399                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2400                  * have unhashed the old state_owner for us, and that we can
2401                  * therefore safely retry using a new one. We should still warn
2402                  * the user though...
2403                  */
2404                 if (status == -NFS4ERR_BAD_SEQID) {
2405                         pr_warn_ratelimited("NFS: v4 server %s "
2406                                         " returned a bad sequence-id error!\n",
2407                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2408                         exception.retry = 1;
2409                         continue;
2410                 }
2411                 /*
2412                  * BAD_STATEID on OPEN means that the server cancelled our
2413                  * state before it received the OPEN_CONFIRM.
2414                  * Recover by retrying the request as per the discussion
2415                  * on Page 181 of RFC3530.
2416                  */
2417                 if (status == -NFS4ERR_BAD_STATEID) {
2418                         exception.retry = 1;
2419                         continue;
2420                 }
2421                 if (status == -EAGAIN) {
2422                         /* We must have found a delegation */
2423                         exception.retry = 1;
2424                         continue;
2425                 }
2426                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2427                         continue;
2428                 res = ERR_PTR(nfs4_handle_exception(server,
2429                                         status, &exception));
2430         } while (exception.retry);
2431         return res;
2432 }
2433
2434 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2435                             struct nfs_fattr *fattr, struct iattr *sattr,
2436                             struct nfs4_state *state, struct nfs4_label *ilabel,
2437                             struct nfs4_label *olabel)
2438 {
2439         struct nfs_server *server = NFS_SERVER(inode);
2440         struct nfs_setattrargs  arg = {
2441                 .fh             = NFS_FH(inode),
2442                 .iap            = sattr,
2443                 .server         = server,
2444                 .bitmask = server->attr_bitmask,
2445                 .label          = ilabel,
2446         };
2447         struct nfs_setattrres  res = {
2448                 .fattr          = fattr,
2449                 .label          = olabel,
2450                 .server         = server,
2451         };
2452         struct rpc_message msg = {
2453                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2454                 .rpc_argp       = &arg,
2455                 .rpc_resp       = &res,
2456                 .rpc_cred       = cred,
2457         };
2458         unsigned long timestamp = jiffies;
2459         fmode_t fmode;
2460         bool truncate;
2461         int status;
2462
2463         arg.bitmask = nfs4_bitmask(server, ilabel);
2464         if (ilabel)
2465                 arg.bitmask = nfs4_bitmask(server, olabel);
2466
2467         nfs_fattr_init(fattr);
2468
2469         /* Servers should only apply open mode checks for file size changes */
2470         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2471         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2472
2473         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2474                 /* Use that stateid */
2475         } else if (truncate && state != NULL) {
2476                 struct nfs_lockowner lockowner = {
2477                         .l_owner = current->files,
2478                         .l_pid = current->tgid,
2479                 };
2480                 if (!nfs4_valid_open_stateid(state))
2481                         return -EBADF;
2482                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2483                                 &lockowner) == -EIO)
2484                         return -EBADF;
2485         } else
2486                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2487
2488         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2489         if (status == 0 && state != NULL)
2490                 renew_lease(server, timestamp);
2491         return status;
2492 }
2493
2494 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2495                            struct nfs_fattr *fattr, struct iattr *sattr,
2496                            struct nfs4_state *state, struct nfs4_label *ilabel,
2497                            struct nfs4_label *olabel)
2498 {
2499         struct nfs_server *server = NFS_SERVER(inode);
2500         struct nfs4_exception exception = {
2501                 .state = state,
2502                 .inode = inode,
2503         };
2504         int err;
2505         do {
2506                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2507                 trace_nfs4_setattr(inode, err);
2508                 switch (err) {
2509                 case -NFS4ERR_OPENMODE:
2510                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2511                                 pr_warn_once("NFSv4: server %s is incorrectly "
2512                                                 "applying open mode checks to "
2513                                                 "a SETATTR that is not "
2514                                                 "changing file size.\n",
2515                                                 server->nfs_client->cl_hostname);
2516                         }
2517                         if (state && !(state->state & FMODE_WRITE)) {
2518                                 err = -EBADF;
2519                                 if (sattr->ia_valid & ATTR_OPEN)
2520                                         err = -EACCES;
2521                                 goto out;
2522                         }
2523                 }
2524                 err = nfs4_handle_exception(server, err, &exception);
2525         } while (exception.retry);
2526 out:
2527         return err;
2528 }
2529
2530 struct nfs4_closedata {
2531         struct inode *inode;
2532         struct nfs4_state *state;
2533         struct nfs_closeargs arg;
2534         struct nfs_closeres res;
2535         struct nfs_fattr fattr;
2536         unsigned long timestamp;
2537         bool roc;
2538         u32 roc_barrier;
2539 };
2540
2541 static void nfs4_free_closedata(void *data)
2542 {
2543         struct nfs4_closedata *calldata = data;
2544         struct nfs4_state_owner *sp = calldata->state->owner;
2545         struct super_block *sb = calldata->state->inode->i_sb;
2546
2547         if (calldata->roc)
2548                 pnfs_roc_release(calldata->state->inode);
2549         nfs4_put_open_state(calldata->state);
2550         nfs_free_seqid(calldata->arg.seqid);
2551         nfs4_put_state_owner(sp);
2552         nfs_sb_deactive(sb);
2553         kfree(calldata);
2554 }
2555
2556 static void nfs4_close_done(struct rpc_task *task, void *data)
2557 {
2558         struct nfs4_closedata *calldata = data;
2559         struct nfs4_state *state = calldata->state;
2560         struct nfs_server *server = NFS_SERVER(calldata->inode);
2561         nfs4_stateid *res_stateid = NULL;
2562
2563         dprintk("%s: begin!\n", __func__);
2564         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2565                 return;
2566         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2567         /* hmm. we are done with the inode, and in the process of freeing
2568          * the state_owner. we keep this around to process errors
2569          */
2570         switch (task->tk_status) {
2571                 case 0:
2572                         res_stateid = &calldata->res.stateid;
2573                         if (calldata->arg.fmode == 0 && calldata->roc)
2574                                 pnfs_roc_set_barrier(state->inode,
2575                                                      calldata->roc_barrier);
2576                         renew_lease(server, calldata->timestamp);
2577                         break;
2578                 case -NFS4ERR_ADMIN_REVOKED:
2579                 case -NFS4ERR_STALE_STATEID:
2580                 case -NFS4ERR_OLD_STATEID:
2581                 case -NFS4ERR_BAD_STATEID:
2582                 case -NFS4ERR_EXPIRED:
2583                         if (calldata->arg.fmode == 0)
2584                                 break;
2585                 default:
2586                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
2587                                 rpc_restart_call_prepare(task);
2588                                 goto out_release;
2589                         }
2590         }
2591         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2592 out_release:
2593         nfs_release_seqid(calldata->arg.seqid);
2594         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2595         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2596 }
2597
2598 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2599 {
2600         struct nfs4_closedata *calldata = data;
2601         struct nfs4_state *state = calldata->state;
2602         struct inode *inode = calldata->inode;
2603         bool is_rdonly, is_wronly, is_rdwr;
2604         int call_close = 0;
2605
2606         dprintk("%s: begin!\n", __func__);
2607         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2608                 goto out_wait;
2609
2610         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2611         spin_lock(&state->owner->so_lock);
2612         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2613         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2614         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2615         /* Calculate the current open share mode */
2616         calldata->arg.fmode = 0;
2617         if (is_rdonly || is_rdwr)
2618                 calldata->arg.fmode |= FMODE_READ;
2619         if (is_wronly || is_rdwr)
2620                 calldata->arg.fmode |= FMODE_WRITE;
2621         /* Calculate the change in open mode */
2622         if (state->n_rdwr == 0) {
2623                 if (state->n_rdonly == 0) {
2624                         call_close |= is_rdonly || is_rdwr;
2625                         calldata->arg.fmode &= ~FMODE_READ;
2626                 }
2627                 if (state->n_wronly == 0) {
2628                         call_close |= is_wronly || is_rdwr;
2629                         calldata->arg.fmode &= ~FMODE_WRITE;
2630                 }
2631         }
2632         if (!nfs4_valid_open_stateid(state))
2633                 call_close = 0;
2634         spin_unlock(&state->owner->so_lock);
2635
2636         if (!call_close) {
2637                 /* Note: exit _without_ calling nfs4_close_done */
2638                 goto out_no_action;
2639         }
2640
2641         if (calldata->arg.fmode == 0) {
2642                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2643                 if (calldata->roc &&
2644                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2645                         nfs_release_seqid(calldata->arg.seqid);
2646                         goto out_wait;
2647                     }
2648         }
2649
2650         nfs_fattr_init(calldata->res.fattr);
2651         calldata->timestamp = jiffies;
2652         if (nfs4_setup_sequence(NFS_SERVER(inode),
2653                                 &calldata->arg.seq_args,
2654                                 &calldata->res.seq_res,
2655                                 task) != 0)
2656                 nfs_release_seqid(calldata->arg.seqid);
2657         dprintk("%s: done!\n", __func__);
2658         return;
2659 out_no_action:
2660         task->tk_action = NULL;
2661 out_wait:
2662         nfs4_sequence_done(task, &calldata->res.seq_res);
2663 }
2664
2665 static const struct rpc_call_ops nfs4_close_ops = {
2666         .rpc_call_prepare = nfs4_close_prepare,
2667         .rpc_call_done = nfs4_close_done,
2668         .rpc_release = nfs4_free_closedata,
2669 };
2670
2671 static bool nfs4_state_has_opener(struct nfs4_state *state)
2672 {
2673         /* first check existing openers */
2674         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2675             state->n_rdonly != 0)
2676                 return true;
2677
2678         if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2679             state->n_wronly != 0)
2680                 return true;
2681
2682         if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2683             state->n_rdwr != 0)
2684                 return true;
2685
2686         return false;
2687 }
2688
2689 static bool nfs4_roc(struct inode *inode)
2690 {
2691         struct nfs_inode *nfsi = NFS_I(inode);
2692         struct nfs_open_context *ctx;
2693         struct nfs4_state *state;
2694
2695         spin_lock(&inode->i_lock);
2696         list_for_each_entry(ctx, &nfsi->open_files, list) {
2697                 state = ctx->state;
2698                 if (state == NULL)
2699                         continue;
2700                 if (nfs4_state_has_opener(state)) {
2701                         spin_unlock(&inode->i_lock);
2702                         return false;
2703                 }
2704         }
2705         spin_unlock(&inode->i_lock);
2706
2707         if (nfs4_check_delegation(inode, FMODE_READ))
2708                 return false;
2709
2710         return pnfs_roc(inode);
2711 }
2712
2713 /*
2714  * It is possible for data to be read/written from a mem-mapped file
2715  * after the sys_close call (which hits the vfs layer as a flush).
2716  * This means that we can't safely call nfsv4 close on a file until
2717  * the inode is cleared. This in turn means that we are not good
2718  * NFSv4 citizens - we do not indicate to the server to update the file's
2719  * share state even when we are done with one of the three share
2720  * stateid's in the inode.
2721  *
2722  * NOTE: Caller must be holding the sp->so_owner semaphore!
2723  */
2724 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2725 {
2726         struct nfs_server *server = NFS_SERVER(state->inode);
2727         struct nfs4_closedata *calldata;
2728         struct nfs4_state_owner *sp = state->owner;
2729         struct rpc_task *task;
2730         struct rpc_message msg = {
2731                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2732                 .rpc_cred = state->owner->so_cred,
2733         };
2734         struct rpc_task_setup task_setup_data = {
2735                 .rpc_client = server->client,
2736                 .rpc_message = &msg,
2737                 .callback_ops = &nfs4_close_ops,
2738                 .workqueue = nfsiod_workqueue,
2739                 .flags = RPC_TASK_ASYNC,
2740         };
2741         int status = -ENOMEM;
2742
2743         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2744                 &task_setup_data.rpc_client, &msg);
2745
2746         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2747         if (calldata == NULL)
2748                 goto out;
2749         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2750         calldata->inode = state->inode;
2751         calldata->state = state;
2752         calldata->arg.fh = NFS_FH(state->inode);
2753         calldata->arg.stateid = &state->open_stateid;
2754         /* Serialization for the sequence id */
2755         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2756         if (calldata->arg.seqid == NULL)
2757                 goto out_free_calldata;
2758         calldata->arg.fmode = 0;
2759         calldata->arg.bitmask = server->cache_consistency_bitmask;
2760         calldata->res.fattr = &calldata->fattr;
2761         calldata->res.seqid = calldata->arg.seqid;
2762         calldata->res.server = server;
2763         calldata->roc = nfs4_roc(state->inode);
2764         nfs_sb_active(calldata->inode->i_sb);
2765
2766         msg.rpc_argp = &calldata->arg;
2767         msg.rpc_resp = &calldata->res;
2768         task_setup_data.callback_data = calldata;
2769         task = rpc_run_task(&task_setup_data);
2770         if (IS_ERR(task))
2771                 return PTR_ERR(task);
2772         status = 0;
2773         if (wait)
2774                 status = rpc_wait_for_completion_task(task);
2775         rpc_put_task(task);
2776         return status;
2777 out_free_calldata:
2778         kfree(calldata);
2779 out:
2780         nfs4_put_open_state(state);
2781         nfs4_put_state_owner(sp);
2782         return status;
2783 }
2784
2785 static struct inode *
2786 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2787                 int open_flags, struct iattr *attr, int *opened)
2788 {
2789         struct nfs4_state *state;
2790         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2791
2792         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2793
2794         /* Protect against concurrent sillydeletes */
2795         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2796
2797         nfs4_label_release_security(label);
2798
2799         if (IS_ERR(state))
2800                 return ERR_CAST(state);
2801         return state->inode;
2802 }
2803
2804 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2805 {
2806         if (ctx->state == NULL)
2807                 return;
2808         if (is_sync)
2809                 nfs4_close_sync(ctx->state, ctx->mode);
2810         else
2811                 nfs4_close_state(ctx->state, ctx->mode);
2812 }
2813
2814 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2815 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2816 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2817
2818 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2819 {
2820         struct nfs4_server_caps_arg args = {
2821                 .fhandle = fhandle,
2822         };
2823         struct nfs4_server_caps_res res = {};
2824         struct rpc_message msg = {
2825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2826                 .rpc_argp = &args,
2827                 .rpc_resp = &res,
2828         };
2829         int status;
2830
2831         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2832         if (status == 0) {
2833                 /* Sanity check the server answers */
2834                 switch (server->nfs_client->cl_minorversion) {
2835                 case 0:
2836                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2837                         res.attr_bitmask[2] = 0;
2838                         break;
2839                 case 1:
2840                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2841                         break;
2842                 case 2:
2843                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2844                 }
2845                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2846                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2847                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2848                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2849                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2850                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2851                                 NFS_CAP_SECURITY_LABEL);
2852                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2853                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2854                         server->caps |= NFS_CAP_ACLS;
2855                 if (res.has_links != 0)
2856                         server->caps |= NFS_CAP_HARDLINKS;
2857                 if (res.has_symlinks != 0)
2858                         server->caps |= NFS_CAP_SYMLINKS;
2859                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2860                         server->caps |= NFS_CAP_FILEID;
2861                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2862                         server->caps |= NFS_CAP_MODE;
2863                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2864                         server->caps |= NFS_CAP_NLINK;
2865                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2866                         server->caps |= NFS_CAP_OWNER;
2867                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2868                         server->caps |= NFS_CAP_OWNER_GROUP;
2869                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2870                         server->caps |= NFS_CAP_ATIME;
2871                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2872                         server->caps |= NFS_CAP_CTIME;
2873                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2874                         server->caps |= NFS_CAP_MTIME;
2875 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2876                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2877                         server->caps |= NFS_CAP_SECURITY_LABEL;
2878 #endif
2879                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2880                                 sizeof(server->attr_bitmask));
2881                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2882
2883                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2884                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2885                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2886                 server->cache_consistency_bitmask[2] = 0;
2887                 server->acl_bitmask = res.acl_bitmask;
2888                 server->fh_expire_type = res.fh_expire_type;
2889         }
2890
2891         return status;
2892 }
2893
2894 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2895 {
2896         struct nfs4_exception exception = { };
2897         int err;
2898         do {
2899                 err = nfs4_handle_exception(server,
2900                                 _nfs4_server_capabilities(server, fhandle),
2901                                 &exception);
2902         } while (exception.retry);
2903         return err;
2904 }
2905
2906 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2907                 struct nfs_fsinfo *info)
2908 {
2909         u32 bitmask[3];
2910         struct nfs4_lookup_root_arg args = {
2911                 .bitmask = bitmask,
2912         };
2913         struct nfs4_lookup_res res = {
2914                 .server = server,
2915                 .fattr = info->fattr,
2916                 .fh = fhandle,
2917         };
2918         struct rpc_message msg = {
2919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2920                 .rpc_argp = &args,
2921                 .rpc_resp = &res,
2922         };
2923
2924         bitmask[0] = nfs4_fattr_bitmap[0];
2925         bitmask[1] = nfs4_fattr_bitmap[1];
2926         /*
2927          * Process the label in the upcoming getfattr
2928          */
2929         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2930
2931         nfs_fattr_init(info->fattr);
2932         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2933 }
2934
2935 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2936                 struct nfs_fsinfo *info)
2937 {
2938         struct nfs4_exception exception = { };
2939         int err;
2940         do {
2941                 err = _nfs4_lookup_root(server, fhandle, info);
2942                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2943                 switch (err) {
2944                 case 0:
2945                 case -NFS4ERR_WRONGSEC:
2946                         goto out;
2947                 default:
2948                         err = nfs4_handle_exception(server, err, &exception);
2949                 }
2950         } while (exception.retry);
2951 out:
2952         return err;
2953 }
2954
2955 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2956                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2957 {
2958         struct rpc_auth_create_args auth_args = {
2959                 .pseudoflavor = flavor,
2960         };
2961         struct rpc_auth *auth;
2962         int ret;
2963
2964         auth = rpcauth_create(&auth_args, server->client);
2965         if (IS_ERR(auth)) {
2966                 ret = -EACCES;
2967                 goto out;
2968         }
2969         ret = nfs4_lookup_root(server, fhandle, info);
2970 out:
2971         return ret;
2972 }
2973
2974 /*
2975  * Retry pseudoroot lookup with various security flavors.  We do this when:
2976  *
2977  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2978  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2979  *
2980  * Returns zero on success, or a negative NFS4ERR value, or a
2981  * negative errno value.
2982  */
2983 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2984                               struct nfs_fsinfo *info)
2985 {
2986         /* Per 3530bis 15.33.5 */
2987         static const rpc_authflavor_t flav_array[] = {
2988                 RPC_AUTH_GSS_KRB5P,
2989                 RPC_AUTH_GSS_KRB5I,
2990                 RPC_AUTH_GSS_KRB5,
2991                 RPC_AUTH_UNIX,                  /* courtesy */
2992                 RPC_AUTH_NULL,
2993         };
2994         int status = -EPERM;
2995         size_t i;
2996
2997         if (server->auth_info.flavor_len > 0) {
2998                 /* try each flavor specified by user */
2999                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3000                         status = nfs4_lookup_root_sec(server, fhandle, info,
3001                                                 server->auth_info.flavors[i]);
3002                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3003                                 continue;
3004                         break;
3005                 }
3006         } else {
3007                 /* no flavors specified by user, try default list */
3008                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3009                         status = nfs4_lookup_root_sec(server, fhandle, info,
3010                                                       flav_array[i]);
3011                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3012                                 continue;
3013                         break;
3014                 }
3015         }
3016
3017         /*
3018          * -EACCESS could mean that the user doesn't have correct permissions
3019          * to access the mount.  It could also mean that we tried to mount
3020          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3021          * existing mount programs don't handle -EACCES very well so it should
3022          * be mapped to -EPERM instead.
3023          */
3024         if (status == -EACCES)
3025                 status = -EPERM;
3026         return status;
3027 }
3028
3029 static int nfs4_do_find_root_sec(struct nfs_server *server,
3030                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3031 {
3032         int mv = server->nfs_client->cl_minorversion;
3033         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3034 }
3035
3036 /**
3037  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3038  * @server: initialized nfs_server handle
3039  * @fhandle: we fill in the pseudo-fs root file handle
3040  * @info: we fill in an FSINFO struct
3041  * @auth_probe: probe the auth flavours
3042  *
3043  * Returns zero on success, or a negative errno.
3044  */
3045 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3046                          struct nfs_fsinfo *info,
3047                          bool auth_probe)
3048 {
3049         int status;
3050
3051         switch (auth_probe) {
3052         case false:
3053                 status = nfs4_lookup_root(server, fhandle, info);
3054                 if (status != -NFS4ERR_WRONGSEC)
3055                         break;
3056         default:
3057                 status = nfs4_do_find_root_sec(server, fhandle, info);
3058         }
3059
3060         if (status == 0)
3061                 status = nfs4_server_capabilities(server, fhandle);
3062         if (status == 0)
3063                 status = nfs4_do_fsinfo(server, fhandle, info);
3064
3065         return nfs4_map_errors(status);
3066 }
3067
3068 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3069                               struct nfs_fsinfo *info)
3070 {
3071         int error;
3072         struct nfs_fattr *fattr = info->fattr;
3073         struct nfs4_label *label = NULL;
3074
3075         error = nfs4_server_capabilities(server, mntfh);
3076         if (error < 0) {
3077                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3078                 return error;
3079         }
3080
3081         label = nfs4_label_alloc(server, GFP_KERNEL);
3082         if (IS_ERR(label))
3083                 return PTR_ERR(label);
3084
3085         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3086         if (error < 0) {
3087                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3088                 goto err_free_label;
3089         }
3090
3091         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3092             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3093                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3094
3095 err_free_label:
3096         nfs4_label_free(label);
3097
3098         return error;
3099 }
3100
3101 /*
3102  * Get locations and (maybe) other attributes of a referral.
3103  * Note that we'll actually follow the referral later when
3104  * we detect fsid mismatch in inode revalidation
3105  */
3106 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3107                              const struct qstr *name, struct nfs_fattr *fattr,
3108                              struct nfs_fh *fhandle)
3109 {
3110         int status = -ENOMEM;
3111         struct page *page = NULL;
3112         struct nfs4_fs_locations *locations = NULL;
3113
3114         page = alloc_page(GFP_KERNEL);
3115         if (page == NULL)
3116                 goto out;
3117         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3118         if (locations == NULL)
3119                 goto out;
3120
3121         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3122         if (status != 0)
3123                 goto out;
3124
3125         /*
3126          * If the fsid didn't change, this is a migration event, not a
3127          * referral.  Cause us to drop into the exception handler, which
3128          * will kick off migration recovery.
3129          */
3130         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3131                 dprintk("%s: server did not return a different fsid for"
3132                         " a referral at %s\n", __func__, name->name);
3133                 status = -NFS4ERR_MOVED;
3134                 goto out;
3135         }
3136         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3137         nfs_fixup_referral_attributes(&locations->fattr);
3138
3139         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3140         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3141         memset(fhandle, 0, sizeof(struct nfs_fh));
3142 out:
3143         if (page)
3144                 __free_page(page);
3145         kfree(locations);
3146         return status;
3147 }
3148
3149 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3150                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3151 {
3152         struct nfs4_getattr_arg args = {
3153                 .fh = fhandle,
3154                 .bitmask = server->attr_bitmask,
3155         };
3156         struct nfs4_getattr_res res = {
3157                 .fattr = fattr,
3158                 .label = label,
3159                 .server = server,
3160         };
3161         struct rpc_message msg = {
3162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3163                 .rpc_argp = &args,
3164                 .rpc_resp = &res,
3165         };
3166
3167         args.bitmask = nfs4_bitmask(server, label);
3168
3169         nfs_fattr_init(fattr);
3170         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3171 }
3172
3173 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3174                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3175 {
3176         struct nfs4_exception exception = { };
3177         int err;
3178         do {
3179                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3180                 trace_nfs4_getattr(server, fhandle, fattr, err);
3181                 err = nfs4_handle_exception(server, err,
3182                                 &exception);
3183         } while (exception.retry);
3184         return err;
3185 }
3186
3187 /*
3188  * The file is not closed if it is opened due to the a request to change
3189  * the size of the file. The open call will not be needed once the
3190  * VFS layer lookup-intents are implemented.
3191  *
3192  * Close is called when the inode is destroyed.
3193  * If we haven't opened the file for O_WRONLY, we
3194  * need to in the size_change case to obtain a stateid.
3195  *
3196  * Got race?
3197  * Because OPEN is always done by name in nfsv4, it is
3198  * possible that we opened a different file by the same
3199  * name.  We can recognize this race condition, but we
3200  * can't do anything about it besides returning an error.
3201  *
3202  * This will be fixed with VFS changes (lookup-intent).
3203  */
3204 static int
3205 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3206                   struct iattr *sattr)
3207 {
3208         struct inode *inode = dentry->d_inode;
3209         struct rpc_cred *cred = NULL;
3210         struct nfs4_state *state = NULL;
3211         struct nfs4_label *label = NULL;
3212         int status;
3213
3214         if (pnfs_ld_layoutret_on_setattr(inode))
3215                 pnfs_commit_and_return_layout(inode);
3216
3217         nfs_fattr_init(fattr);
3218
3219         /* Deal with open(O_TRUNC) */
3220         if (sattr->ia_valid & ATTR_OPEN)
3221                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3222
3223         /* Optimization: if the end result is no change, don't RPC */
3224         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3225                 return 0;
3226
3227         /* Search for an existing open(O_WRITE) file */
3228         if (sattr->ia_valid & ATTR_FILE) {
3229                 struct nfs_open_context *ctx;
3230
3231                 ctx = nfs_file_open_context(sattr->ia_file);
3232                 if (ctx) {
3233                         cred = ctx->cred;
3234                         state = ctx->state;
3235                 }
3236         }
3237
3238         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3239         if (IS_ERR(label))
3240                 return PTR_ERR(label);
3241
3242         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3243         if (status == 0) {
3244                 nfs_setattr_update_inode(inode, sattr);
3245                 nfs_setsecurity(inode, fattr, label);
3246         }
3247         nfs4_label_free(label);
3248         return status;
3249 }
3250
3251 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3252                 const struct qstr *name, struct nfs_fh *fhandle,
3253                 struct nfs_fattr *fattr, struct nfs4_label *label)
3254 {
3255         struct nfs_server *server = NFS_SERVER(dir);
3256         int                    status;
3257         struct nfs4_lookup_arg args = {
3258                 .bitmask = server->attr_bitmask,
3259                 .dir_fh = NFS_FH(dir),
3260                 .name = name,
3261         };
3262         struct nfs4_lookup_res res = {
3263                 .server = server,
3264                 .fattr = fattr,
3265                 .label = label,
3266                 .fh = fhandle,
3267         };
3268         struct rpc_message msg = {
3269                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3270                 .rpc_argp = &args,
3271                 .rpc_resp = &res,
3272         };
3273
3274         args.bitmask = nfs4_bitmask(server, label);
3275
3276         nfs_fattr_init(fattr);
3277
3278         dprintk("NFS call  lookup %s\n", name->name);
3279         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3280         dprintk("NFS reply lookup: %d\n", status);
3281         return status;
3282 }
3283
3284 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3285 {
3286         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3287                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3288         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3289         fattr->nlink = 2;
3290 }
3291
3292 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3293                                    struct qstr *name, struct nfs_fh *fhandle,
3294                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3295 {
3296         struct nfs4_exception exception = { };
3297         struct rpc_clnt *client = *clnt;
3298         int err;
3299         do {
3300                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3301                 trace_nfs4_lookup(dir, name, err);
3302                 switch (err) {
3303                 case -NFS4ERR_BADNAME:
3304                         err = -ENOENT;
3305                         goto out;
3306                 case -NFS4ERR_MOVED:
3307                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3308                         goto out;
3309                 case -NFS4ERR_WRONGSEC:
3310                         err = -EPERM;
3311                         if (client != *clnt)
3312                                 goto out;
3313                         client = nfs4_negotiate_security(client, dir, name);
3314                         if (IS_ERR(client))
3315                                 return PTR_ERR(client);
3316
3317                         exception.retry = 1;
3318                         break;
3319                 default:
3320                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3321                 }
3322         } while (exception.retry);
3323
3324 out:
3325         if (err == 0)
3326                 *clnt = client;
3327         else if (client != *clnt)
3328                 rpc_shutdown_client(client);
3329
3330         return err;
3331 }
3332
3333 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3334                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3335                             struct nfs4_label *label)
3336 {
3337         int status;
3338         struct rpc_clnt *client = NFS_CLIENT(dir);
3339
3340         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3341         if (client != NFS_CLIENT(dir)) {
3342                 rpc_shutdown_client(client);
3343                 nfs_fixup_secinfo_attributes(fattr);
3344         }
3345         return status;
3346 }
3347
3348 struct rpc_clnt *
3349 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3350                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3351 {
3352         struct rpc_clnt *client = NFS_CLIENT(dir);
3353         int status;
3354
3355         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3356         if (status < 0)
3357                 return ERR_PTR(status);
3358         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3359 }
3360
3361 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3362 {
3363         struct nfs_server *server = NFS_SERVER(inode);
3364         struct nfs4_accessargs args = {
3365                 .fh = NFS_FH(inode),
3366                 .bitmask = server->cache_consistency_bitmask,
3367         };
3368         struct nfs4_accessres res = {
3369                 .server = server,
3370         };
3371         struct rpc_message msg = {
3372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3373                 .rpc_argp = &args,
3374                 .rpc_resp = &res,
3375                 .rpc_cred = entry->cred,
3376         };
3377         int mode = entry->mask;
3378         int status = 0;
3379
3380         /*
3381          * Determine which access bits we want to ask for...
3382          */
3383         if (mode & MAY_READ)
3384                 args.access |= NFS4_ACCESS_READ;
3385         if (S_ISDIR(inode->i_mode)) {
3386                 if (mode & MAY_WRITE)
3387                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3388                 if (mode & MAY_EXEC)
3389                         args.access |= NFS4_ACCESS_LOOKUP;
3390         } else {
3391                 if (mode & MAY_WRITE)
3392                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3393                 if (mode & MAY_EXEC)
3394                         args.access |= NFS4_ACCESS_EXECUTE;
3395         }
3396
3397         res.fattr = nfs_alloc_fattr();
3398         if (res.fattr == NULL)
3399                 return -ENOMEM;
3400
3401         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3402         if (!status) {
3403                 nfs_access_set_mask(entry, res.access);
3404                 nfs_refresh_inode(inode, res.fattr);
3405         }
3406         nfs_free_fattr(res.fattr);
3407         return status;
3408 }
3409
3410 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3411 {
3412         struct nfs4_exception exception = { };
3413         int err;
3414         do {
3415                 err = _nfs4_proc_access(inode, entry);
3416                 trace_nfs4_access(inode, err);
3417                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3418                                 &exception);
3419         } while (exception.retry);
3420         return err;
3421 }
3422
3423 /*
3424  * TODO: For the time being, we don't try to get any attributes
3425  * along with any of the zero-copy operations READ, READDIR,
3426  * READLINK, WRITE.
3427  *
3428  * In the case of the first three, we want to put the GETATTR
3429  * after the read-type operation -- this is because it is hard
3430  * to predict the length of a GETATTR response in v4, and thus
3431  * align the READ data correctly.  This means that the GETATTR
3432  * may end up partially falling into the page cache, and we should
3433  * shift it into the 'tail' of the xdr_buf before processing.
3434  * To do this efficiently, we need to know the total length
3435  * of data received, which doesn't seem to be available outside
3436  * of the RPC layer.
3437  *
3438  * In the case of WRITE, we also want to put the GETATTR after
3439  * the operation -- in this case because we want to make sure
3440  * we get the post-operation mtime and size.
3441  *
3442  * Both of these changes to the XDR layer would in fact be quite
3443  * minor, but I decided to leave them for a subsequent patch.
3444  */
3445 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3446                 unsigned int pgbase, unsigned int pglen)
3447 {
3448         struct nfs4_readlink args = {
3449                 .fh       = NFS_FH(inode),
3450                 .pgbase   = pgbase,
3451                 .pglen    = pglen,
3452                 .pages    = &page,
3453         };
3454         struct nfs4_readlink_res res;
3455         struct rpc_message msg = {
3456                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3457                 .rpc_argp = &args,
3458                 .rpc_resp = &res,
3459         };
3460
3461         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3462 }
3463
3464 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3465                 unsigned int pgbase, unsigned int pglen)
3466 {
3467         struct nfs4_exception exception = { };
3468         int err;
3469         do {
3470                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3471                 trace_nfs4_readlink(inode, err);
3472                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3473                                 &exception);
3474         } while (exception.retry);
3475         return err;
3476 }
3477
3478 /*
3479  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3480  */
3481 static int
3482 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3483                  int flags)
3484 {
3485         struct nfs4_label l, *ilabel = NULL;
3486         struct nfs_open_context *ctx;
3487         struct nfs4_state *state;
3488         int opened = 0;
3489         int status = 0;
3490
3491         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3492         if (IS_ERR(ctx))
3493                 return PTR_ERR(ctx);
3494
3495         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3496
3497         sattr->ia_mode &= ~current_umask();
3498         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3499         if (IS_ERR(state)) {
3500                 status = PTR_ERR(state);
3501                 goto out;
3502         }
3503 out:
3504         nfs4_label_release_security(ilabel);
3505         put_nfs_open_context(ctx);
3506         return status;
3507 }
3508
3509 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3510 {
3511         struct nfs_server *server = NFS_SERVER(dir);
3512         struct nfs_removeargs args = {
3513                 .fh = NFS_FH(dir),
3514                 .name = *name,
3515         };
3516         struct nfs_removeres res = {
3517                 .server = server,
3518         };
3519         struct rpc_message msg = {
3520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3521                 .rpc_argp = &args,
3522                 .rpc_resp = &res,
3523         };
3524         int status;
3525
3526         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3527         if (status == 0)
3528                 update_changeattr(dir, &res.cinfo);
3529         return status;
3530 }
3531
3532 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3533 {
3534         struct nfs4_exception exception = { };
3535         int err;
3536         do {
3537                 err = _nfs4_proc_remove(dir, name);
3538                 trace_nfs4_remove(dir, name, err);
3539                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3540                                 &exception);
3541         } while (exception.retry);
3542         return err;
3543 }
3544
3545 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3546 {
3547         struct nfs_server *server = NFS_SERVER(dir);
3548         struct nfs_removeargs *args = msg->rpc_argp;
3549         struct nfs_removeres *res = msg->rpc_resp;
3550
3551         res->server = server;
3552         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3553         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3554
3555         nfs_fattr_init(res->dir_attr);
3556 }
3557
3558 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3559 {
3560         nfs4_setup_sequence(NFS_SERVER(data->dir),
3561                         &data->args.seq_args,
3562                         &data->res.seq_res,
3563                         task);
3564 }
3565
3566 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3567 {
3568         struct nfs_unlinkdata *data = task->tk_calldata;
3569         struct nfs_removeres *res = &data->res;
3570
3571         if (!nfs4_sequence_done(task, &res->seq_res))
3572                 return 0;
3573         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3574                 return 0;
3575         update_changeattr(dir, &res->cinfo);
3576         return 1;
3577 }
3578
3579 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3580 {
3581         struct nfs_server *server = NFS_SERVER(dir);
3582         struct nfs_renameargs *arg = msg->rpc_argp;
3583         struct nfs_renameres *res = msg->rpc_resp;
3584
3585         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3586         res->server = server;
3587         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3588 }
3589
3590 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3591 {
3592         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3593                         &data->args.seq_args,
3594                         &data->res.seq_res,
3595                         task);
3596 }
3597
3598 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3599                                  struct inode *new_dir)
3600 {
3601         struct nfs_renamedata *data = task->tk_calldata;
3602         struct nfs_renameres *res = &data->res;
3603
3604         if (!nfs4_sequence_done(task, &res->seq_res))
3605                 return 0;
3606         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3607                 return 0;
3608
3609         update_changeattr(old_dir, &res->old_cinfo);
3610         update_changeattr(new_dir, &res->new_cinfo);
3611         return 1;
3612 }
3613
3614 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3615 {
3616         struct nfs_server *server = NFS_SERVER(inode);
3617         struct nfs4_link_arg arg = {
3618                 .fh     = NFS_FH(inode),
3619                 .dir_fh = NFS_FH(dir),
3620                 .name   = name,
3621                 .bitmask = server->attr_bitmask,
3622         };
3623         struct nfs4_link_res res = {
3624                 .server = server,
3625                 .label = NULL,
3626         };
3627         struct rpc_message msg = {
3628                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3629                 .rpc_argp = &arg,
3630                 .rpc_resp = &res,
3631         };
3632         int status = -ENOMEM;
3633
3634         res.fattr = nfs_alloc_fattr();
3635         if (res.fattr == NULL)
3636                 goto out;
3637
3638         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3639         if (IS_ERR(res.label)) {
3640                 status = PTR_ERR(res.label);
3641                 goto out;
3642         }
3643         arg.bitmask = nfs4_bitmask(server, res.label);
3644
3645         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3646         if (!status) {
3647                 update_changeattr(dir, &res.cinfo);
3648                 status = nfs_post_op_update_inode(inode, res.fattr);
3649                 if (!status)
3650                         nfs_setsecurity(inode, res.fattr, res.label);
3651         }
3652
3653
3654         nfs4_label_free(res.label);
3655
3656 out:
3657         nfs_free_fattr(res.fattr);
3658         return status;
3659 }
3660
3661 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3662 {
3663         struct nfs4_exception exception = { };
3664         int err;
3665         do {
3666                 err = nfs4_handle_exception(NFS_SERVER(inode),
3667                                 _nfs4_proc_link(inode, dir, name),
3668                                 &exception);
3669         } while (exception.retry);
3670         return err;
3671 }
3672
3673 struct nfs4_createdata {
3674         struct rpc_message msg;
3675         struct nfs4_create_arg arg;
3676         struct nfs4_create_res res;
3677         struct nfs_fh fh;
3678         struct nfs_fattr fattr;
3679         struct nfs4_label *label;
3680 };
3681
3682 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3683                 struct qstr *name, struct iattr *sattr, u32 ftype)
3684 {
3685         struct nfs4_createdata *data;
3686
3687         data = kzalloc(sizeof(*data), GFP_KERNEL);
3688         if (data != NULL) {
3689                 struct nfs_server *server = NFS_SERVER(dir);
3690
3691                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3692                 if (IS_ERR(data->label))
3693                         goto out_free;
3694
3695                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3696                 data->msg.rpc_argp = &data->arg;
3697                 data->msg.rpc_resp = &data->res;
3698                 data->arg.dir_fh = NFS_FH(dir);
3699                 data->arg.server = server;
3700                 data->arg.name = name;
3701                 data->arg.attrs = sattr;
3702                 data->arg.ftype = ftype;
3703                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3704                 data->res.server = server;
3705                 data->res.fh = &data->fh;
3706                 data->res.fattr = &data->fattr;
3707                 data->res.label = data->label;
3708                 nfs_fattr_init(data->res.fattr);
3709         }
3710         return data;
3711 out_free:
3712         kfree(data);
3713         return NULL;
3714 }
3715
3716 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3717 {
3718         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3719                                     &data->arg.seq_args, &data->res.seq_res, 1);
3720         if (status == 0) {
3721                 update_changeattr(dir, &data->res.dir_cinfo);
3722                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3723         }
3724         return status;
3725 }
3726
3727 static void nfs4_free_createdata(struct nfs4_createdata *data)
3728 {
3729         nfs4_label_free(data->label);
3730         kfree(data);
3731 }
3732
3733 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3734                 struct page *page, unsigned int len, struct iattr *sattr,
3735                 struct nfs4_label *label)
3736 {
3737         struct nfs4_createdata *data;
3738         int status = -ENAMETOOLONG;
3739
3740         if (len > NFS4_MAXPATHLEN)
3741                 goto out;
3742
3743         status = -ENOMEM;
3744         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3745         if (data == NULL)
3746                 goto out;
3747
3748         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3749         data->arg.u.symlink.pages = &page;
3750         data->arg.u.symlink.len = len;
3751         data->arg.label = label;
3752
3753         status = nfs4_do_create(dir, dentry, data);
3754
3755         nfs4_free_createdata(data);
3756 out:
3757         return status;
3758 }
3759
3760 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3761                 struct page *page, unsigned int len, struct iattr *sattr)
3762 {
3763         struct nfs4_exception exception = { };
3764         struct nfs4_label l, *label = NULL;
3765         int err;
3766
3767         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3768
3769         do {
3770                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3771                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3772                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3773                                 &exception);
3774         } while (exception.retry);
3775
3776         nfs4_label_release_security(label);
3777         return err;
3778 }
3779
3780 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3781                 struct iattr *sattr, struct nfs4_label *label)
3782 {
3783         struct nfs4_createdata *data;
3784         int status = -ENOMEM;
3785
3786         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3787         if (data == NULL)
3788                 goto out;
3789
3790         data->arg.label = label;
3791         status = nfs4_do_create(dir, dentry, data);
3792
3793         nfs4_free_createdata(data);
3794 out:
3795         return status;
3796 }
3797
3798 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3799                 struct iattr *sattr)
3800 {
3801         struct nfs4_exception exception = { };
3802         struct nfs4_label l, *label = NULL;
3803         int err;
3804
3805         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3806
3807         sattr->ia_mode &= ~current_umask();
3808         do {
3809                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3810                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3811                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3812                                 &exception);
3813         } while (exception.retry);
3814         nfs4_label_release_security(label);
3815
3816         return err;
3817 }
3818
3819 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3820                 u64 cookie, struct page **pages, unsigned int count, int plus)
3821 {
3822         struct inode            *dir = dentry->d_inode;
3823         struct nfs4_readdir_arg args = {
3824                 .fh = NFS_FH(dir),
3825                 .pages = pages,
3826                 .pgbase = 0,
3827                 .count = count,
3828                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3829                 .plus = plus,
3830         };
3831         struct nfs4_readdir_res res;
3832         struct rpc_message msg = {
3833                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3834                 .rpc_argp = &args,
3835                 .rpc_resp = &res,
3836                 .rpc_cred = cred,
3837         };
3838         int                     status;
3839
3840         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3841                         dentry,
3842                         (unsigned long long)cookie);
3843         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3844         res.pgbase = args.pgbase;
3845         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3846         if (status >= 0) {
3847                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3848                 status += args.pgbase;
3849         }
3850
3851         nfs_invalidate_atime(dir);
3852
3853         dprintk("%s: returns %d\n", __func__, status);
3854         return status;
3855 }
3856
3857 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3858                 u64 cookie, struct page **pages, unsigned int count, int plus)
3859 {
3860         struct nfs4_exception exception = { };
3861         int err;
3862         do {
3863                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3864                                 pages, count, plus);
3865                 trace_nfs4_readdir(dentry->d_inode, err);
3866                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3867                                 &exception);
3868         } while (exception.retry);
3869         return err;
3870 }
3871
3872 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3873                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3874 {
3875         struct nfs4_createdata *data;
3876         int mode = sattr->ia_mode;
3877         int status = -ENOMEM;
3878
3879         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3880         if (data == NULL)
3881                 goto out;
3882
3883         if (S_ISFIFO(mode))
3884                 data->arg.ftype = NF4FIFO;
3885         else if (S_ISBLK(mode)) {
3886                 data->arg.ftype = NF4BLK;
3887                 data->arg.u.device.specdata1 = MAJOR(rdev);
3888                 data->arg.u.device.specdata2 = MINOR(rdev);
3889         }
3890         else if (S_ISCHR(mode)) {
3891                 data->arg.ftype = NF4CHR;
3892                 data->arg.u.device.specdata1 = MAJOR(rdev);
3893                 data->arg.u.device.specdata2 = MINOR(rdev);
3894         } else if (!S_ISSOCK(mode)) {
3895                 status = -EINVAL;
3896                 goto out_free;
3897         }
3898
3899         data->arg.label = label;
3900         status = nfs4_do_create(dir, dentry, data);
3901 out_free:
3902         nfs4_free_createdata(data);
3903 out:
3904         return status;
3905 }
3906
3907 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3908                 struct iattr *sattr, dev_t rdev)
3909 {
3910         struct nfs4_exception exception = { };
3911         struct nfs4_label l, *label = NULL;
3912         int err;
3913
3914         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3915
3916         sattr->ia_mode &= ~current_umask();
3917         do {
3918                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3919                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3920                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3921                                 &exception);
3922         } while (exception.retry);
3923
3924         nfs4_label_release_security(label);
3925
3926         return err;
3927 }
3928
3929 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3930                  struct nfs_fsstat *fsstat)
3931 {
3932         struct nfs4_statfs_arg args = {
3933                 .fh = fhandle,
3934                 .bitmask = server->attr_bitmask,
3935         };
3936         struct nfs4_statfs_res res = {
3937                 .fsstat = fsstat,
3938         };
3939         struct rpc_message msg = {
3940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3941                 .rpc_argp = &args,
3942                 .rpc_resp = &res,
3943         };
3944
3945         nfs_fattr_init(fsstat->fattr);
3946         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3947 }
3948
3949 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3950 {
3951         struct nfs4_exception exception = { };
3952         int err;
3953         do {
3954                 err = nfs4_handle_exception(server,
3955                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3956                                 &exception);
3957         } while (exception.retry);
3958         return err;
3959 }
3960
3961 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3962                 struct nfs_fsinfo *fsinfo)
3963 {
3964         struct nfs4_fsinfo_arg args = {
3965                 .fh = fhandle,
3966                 .bitmask = server->attr_bitmask,
3967         };
3968         struct nfs4_fsinfo_res res = {
3969                 .fsinfo = fsinfo,
3970         };
3971         struct rpc_message msg = {
3972                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3973                 .rpc_argp = &args,
3974                 .rpc_resp = &res,
3975         };
3976
3977         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3978 }
3979
3980 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3981 {
3982         struct nfs4_exception exception = { };
3983         unsigned long now = jiffies;
3984         int err;
3985
3986         do {
3987                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3988                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3989                 if (err == 0) {
3990                         struct nfs_client *clp = server->nfs_client;
3991
3992                         spin_lock(&clp->cl_lock);
3993                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3994                         clp->cl_last_renewal = now;
3995                         spin_unlock(&clp->cl_lock);
3996                         break;
3997                 }
3998                 err = nfs4_handle_exception(server, err, &exception);
3999         } while (exception.retry);
4000         return err;
4001 }
4002
4003 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4004 {
4005         int error;
4006
4007         nfs_fattr_init(fsinfo->fattr);
4008         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4009         if (error == 0) {
4010                 /* block layout checks this! */
4011                 server->pnfs_blksize = fsinfo->blksize;
4012                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4013         }
4014
4015         return error;
4016 }
4017
4018 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4019                 struct nfs_pathconf *pathconf)
4020 {
4021         struct nfs4_pathconf_arg args = {
4022                 .fh = fhandle,
4023                 .bitmask = server->attr_bitmask,
4024         };
4025         struct nfs4_pathconf_res res = {
4026                 .pathconf = pathconf,
4027         };
4028         struct rpc_message msg = {
4029                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4030                 .rpc_argp = &args,
4031                 .rpc_resp = &res,
4032         };
4033
4034         /* None of the pathconf attributes are mandatory to implement */
4035         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4036                 memset(pathconf, 0, sizeof(*pathconf));
4037                 return 0;
4038         }
4039
4040         nfs_fattr_init(pathconf->fattr);
4041         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4042 }
4043
4044 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4045                 struct nfs_pathconf *pathconf)
4046 {
4047         struct nfs4_exception exception = { };
4048         int err;
4049
4050         do {
4051                 err = nfs4_handle_exception(server,
4052                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4053                                 &exception);
4054         } while (exception.retry);
4055         return err;
4056 }
4057
4058 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4059                 const struct nfs_open_context *ctx,
4060                 const struct nfs_lock_context *l_ctx,
4061                 fmode_t fmode)
4062 {
4063         const struct nfs_lockowner *lockowner = NULL;
4064
4065         if (l_ctx != NULL)
4066                 lockowner = &l_ctx->lockowner;
4067         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4068 }
4069 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4070
4071 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4072                 const struct nfs_open_context *ctx,
4073                 const struct nfs_lock_context *l_ctx,
4074                 fmode_t fmode)
4075 {
4076         nfs4_stateid current_stateid;
4077
4078         /* If the current stateid represents a lost lock, then exit */
4079         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4080                 return true;
4081         return nfs4_stateid_match(stateid, &current_stateid);
4082 }
4083
4084 static bool nfs4_error_stateid_expired(int err)
4085 {
4086         switch (err) {
4087         case -NFS4ERR_DELEG_REVOKED:
4088         case -NFS4ERR_ADMIN_REVOKED:
4089         case -NFS4ERR_BAD_STATEID:
4090         case -NFS4ERR_STALE_STATEID:
4091         case -NFS4ERR_OLD_STATEID:
4092         case -NFS4ERR_OPENMODE:
4093         case -NFS4ERR_EXPIRED:
4094                 return true;
4095         }
4096         return false;
4097 }
4098
4099 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4100 {
4101         nfs_invalidate_atime(hdr->inode);
4102 }
4103
4104 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4105 {
4106         struct nfs_server *server = NFS_SERVER(hdr->inode);
4107
4108         trace_nfs4_read(hdr, task->tk_status);
4109         if (nfs4_async_handle_error(task, server,
4110                                     hdr->args.context->state) == -EAGAIN) {
4111                 rpc_restart_call_prepare(task);
4112                 return -EAGAIN;
4113         }
4114
4115         __nfs4_read_done_cb(hdr);
4116         if (task->tk_status > 0)
4117                 renew_lease(server, hdr->timestamp);
4118         return 0;
4119 }
4120
4121 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4122                 struct nfs_pgio_args *args)
4123 {
4124
4125         if (!nfs4_error_stateid_expired(task->tk_status) ||
4126                 nfs4_stateid_is_current(&args->stateid,
4127                                 args->context,
4128                                 args->lock_context,
4129                                 FMODE_READ))
4130                 return false;
4131         rpc_restart_call_prepare(task);
4132         return true;
4133 }
4134
4135 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4136 {
4137
4138         dprintk("--> %s\n", __func__);
4139
4140         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4141                 return -EAGAIN;
4142         if (nfs4_read_stateid_changed(task, &hdr->args))
4143                 return -EAGAIN;
4144         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4145                                     nfs4_read_done_cb(task, hdr);
4146 }
4147
4148 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4149                                  struct rpc_message *msg)
4150 {
4151         hdr->timestamp   = jiffies;
4152         hdr->pgio_done_cb = nfs4_read_done_cb;
4153         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4154         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4155 }
4156
4157 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4158                                       struct nfs_pgio_header *hdr)
4159 {
4160         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4161                         &hdr->args.seq_args,
4162                         &hdr->res.seq_res,
4163                         task))
4164                 return 0;
4165         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4166                                 hdr->args.lock_context,
4167                                 hdr->rw_ops->rw_mode) == -EIO)
4168                 return -EIO;
4169         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4170                 return -EIO;
4171         return 0;
4172 }
4173
4174 static int nfs4_write_done_cb(struct rpc_task *task,
4175                               struct nfs_pgio_header *hdr)
4176 {
4177         struct inode *inode = hdr->inode;
4178
4179         trace_nfs4_write(hdr, task->tk_status);
4180         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4181                                     hdr->args.context->state) == -EAGAIN) {
4182                 rpc_restart_call_prepare(task);
4183                 return -EAGAIN;
4184         }
4185         if (task->tk_status >= 0) {
4186                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4187                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4188         }
4189         return 0;
4190 }
4191
4192 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4193                 struct nfs_pgio_args *args)
4194 {
4195
4196         if (!nfs4_error_stateid_expired(task->tk_status) ||
4197                 nfs4_stateid_is_current(&args->stateid,
4198                                 args->context,
4199                                 args->lock_context,
4200                                 FMODE_WRITE))
4201                 return false;
4202         rpc_restart_call_prepare(task);
4203         return true;
4204 }
4205
4206 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4207 {
4208         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4209                 return -EAGAIN;
4210         if (nfs4_write_stateid_changed(task, &hdr->args))
4211                 return -EAGAIN;
4212         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4213                 nfs4_write_done_cb(task, hdr);
4214 }
4215
4216 static
4217 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4218 {
4219         /* Don't request attributes for pNFS or O_DIRECT writes */
4220         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4221                 return false;
4222         /* Otherwise, request attributes if and only if we don't hold
4223          * a delegation
4224          */
4225         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4226 }
4227
4228 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4229                                   struct rpc_message *msg)
4230 {
4231         struct nfs_server *server = NFS_SERVER(hdr->inode);
4232
4233         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4234                 hdr->args.bitmask = NULL;
4235                 hdr->res.fattr = NULL;
4236         } else
4237                 hdr->args.bitmask = server->cache_consistency_bitmask;
4238
4239         if (!hdr->pgio_done_cb)
4240                 hdr->pgio_done_cb = nfs4_write_done_cb;
4241         hdr->res.server = server;
4242         hdr->timestamp   = jiffies;
4243
4244         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4245         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4246 }
4247
4248 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4249 {
4250         nfs4_setup_sequence(NFS_SERVER(data->inode),
4251                         &data->args.seq_args,
4252                         &data->res.seq_res,
4253                         task);
4254 }
4255
4256 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4257 {
4258         struct inode *inode = data->inode;
4259
4260         trace_nfs4_commit(data, task->tk_status);
4261         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4262                 rpc_restart_call_prepare(task);
4263                 return -EAGAIN;
4264         }
4265         return 0;
4266 }
4267
4268 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4269 {
4270         if (!nfs4_sequence_done(task, &data->res.seq_res))
4271                 return -EAGAIN;
4272         return data->commit_done_cb(task, data);
4273 }
4274
4275 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4276 {
4277         struct nfs_server *server = NFS_SERVER(data->inode);
4278
4279         if (data->commit_done_cb == NULL)
4280                 data->commit_done_cb = nfs4_commit_done_cb;
4281         data->res.server = server;
4282         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4283         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4284 }
4285
4286 struct nfs4_renewdata {
4287         struct nfs_client       *client;
4288         unsigned long           timestamp;
4289 };
4290
4291 /*
4292  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4293  * standalone procedure for queueing an asynchronous RENEW.
4294  */
4295 static void nfs4_renew_release(void *calldata)
4296 {
4297         struct nfs4_renewdata *data = calldata;
4298         struct nfs_client *clp = data->client;
4299
4300         if (atomic_read(&clp->cl_count) > 1)
4301                 nfs4_schedule_state_renewal(clp);
4302         nfs_put_client(clp);
4303         kfree(data);
4304 }
4305
4306 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4307 {
4308         struct nfs4_renewdata *data = calldata;
4309         struct nfs_client *clp = data->client;
4310         unsigned long timestamp = data->timestamp;
4311
4312         trace_nfs4_renew_async(clp, task->tk_status);
4313         switch (task->tk_status) {
4314         case 0:
4315                 break;
4316         case -NFS4ERR_LEASE_MOVED:
4317                 nfs4_schedule_lease_moved_recovery(clp);
4318                 break;
4319         default:
4320                 /* Unless we're shutting down, schedule state recovery! */
4321                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4322                         return;
4323                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4324                         nfs4_schedule_lease_recovery(clp);
4325                         return;
4326                 }
4327                 nfs4_schedule_path_down_recovery(clp);
4328         }
4329         do_renew_lease(clp, timestamp);
4330 }
4331
4332 static const struct rpc_call_ops nfs4_renew_ops = {
4333         .rpc_call_done = nfs4_renew_done,
4334         .rpc_release = nfs4_renew_release,
4335 };
4336
4337 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4338 {
4339         struct rpc_message msg = {
4340                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4341                 .rpc_argp       = clp,
4342                 .rpc_cred       = cred,
4343         };
4344         struct nfs4_renewdata *data;
4345
4346         if (renew_flags == 0)
4347                 return 0;
4348         if (!atomic_inc_not_zero(&clp->cl_count))
4349                 return -EIO;
4350         data = kmalloc(sizeof(*data), GFP_NOFS);
4351         if (data == NULL)
4352                 return -ENOMEM;
4353         data->client = clp;
4354         data->timestamp = jiffies;
4355         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4356                         &nfs4_renew_ops, data);
4357 }
4358
4359 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4360 {
4361         struct rpc_message msg = {
4362                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4363                 .rpc_argp       = clp,
4364                 .rpc_cred       = cred,
4365         };
4366         unsigned long now = jiffies;
4367         int status;
4368
4369         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4370         if (status < 0)
4371                 return status;
4372         do_renew_lease(clp, now);
4373         return 0;
4374 }
4375
4376 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4377 {
4378         return server->caps & NFS_CAP_ACLS;
4379 }
4380
4381 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4382  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4383  * the stack.
4384  */
4385 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4386
4387 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4388                 struct page **pages, unsigned int *pgbase)
4389 {
4390         struct page *newpage, **spages;
4391         int rc = 0;
4392         size_t len;
4393         spages = pages;
4394
4395         do {
4396                 len = min_t(size_t, PAGE_SIZE, buflen);
4397                 newpage = alloc_page(GFP_KERNEL);
4398
4399                 if (newpage == NULL)
4400                         goto unwind;
4401                 memcpy(page_address(newpage), buf, len);
4402                 buf += len;
4403                 buflen -= len;
4404                 *pages++ = newpage;
4405                 rc++;
4406         } while (buflen != 0);
4407
4408         return rc;
4409
4410 unwind:
4411         for(; rc > 0; rc--)
4412                 __free_page(spages[rc-1]);
4413         return -ENOMEM;
4414 }
4415
4416 struct nfs4_cached_acl {
4417         int cached;
4418         size_t len;
4419         char data[0];
4420 };
4421
4422 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4423 {
4424         struct nfs_inode *nfsi = NFS_I(inode);
4425
4426         spin_lock(&inode->i_lock);
4427         kfree(nfsi->nfs4_acl);
4428         nfsi->nfs4_acl = acl;
4429         spin_unlock(&inode->i_lock);
4430 }
4431
4432 static void nfs4_zap_acl_attr(struct inode *inode)
4433 {
4434         nfs4_set_cached_acl(inode, NULL);
4435 }
4436
4437 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4438 {
4439         struct nfs_inode *nfsi = NFS_I(inode);
4440         struct nfs4_cached_acl *acl;
4441         int ret = -ENOENT;
4442
4443         spin_lock(&inode->i_lock);
4444         acl = nfsi->nfs4_acl;
4445         if (acl == NULL)
4446                 goto out;
4447         if (buf == NULL) /* user is just asking for length */
4448                 goto out_len;
4449         if (acl->cached == 0)
4450                 goto out;
4451         ret = -ERANGE; /* see getxattr(2) man page */
4452         if (acl->len > buflen)
4453                 goto out;
4454         memcpy(buf, acl->data, acl->len);
4455 out_len:
4456         ret = acl->len;
4457 out:
4458         spin_unlock(&inode->i_lock);
4459         return ret;
4460 }
4461
4462 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4463 {
4464         struct nfs4_cached_acl *acl;
4465         size_t buflen = sizeof(*acl) + acl_len;
4466
4467         if (buflen <= PAGE_SIZE) {
4468                 acl = kmalloc(buflen, GFP_KERNEL);
4469                 if (acl == NULL)
4470                         goto out;
4471                 acl->cached = 1;
4472                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4473         } else {
4474                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4475                 if (acl == NULL)
4476                         goto out;
4477                 acl->cached = 0;
4478         }
4479         acl->len = acl_len;
4480 out:
4481         nfs4_set_cached_acl(inode, acl);
4482 }
4483
4484 /*
4485  * The getxattr API returns the required buffer length when called with a
4486  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4487  * the required buf.  On a NULL buf, we send a page of data to the server
4488  * guessing that the ACL request can be serviced by a page. If so, we cache
4489  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4490  * the cache. If not so, we throw away the page, and cache the required
4491  * length. The next getxattr call will then produce another round trip to
4492  * the server, this time with the input buf of the required size.
4493  */
4494 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4495 {
4496         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4497         struct nfs_getaclargs args = {
4498                 .fh = NFS_FH(inode),
4499                 .acl_pages = pages,
4500                 .acl_len = buflen,
4501         };
4502         struct nfs_getaclres res = {
4503                 .acl_len = buflen,
4504         };
4505         struct rpc_message msg = {
4506                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4507                 .rpc_argp = &args,
4508                 .rpc_resp = &res,
4509         };
4510         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4511         int ret = -ENOMEM, i;
4512
4513         /* As long as we're doing a round trip to the server anyway,
4514          * let's be prepared for a page of acl data. */
4515         if (npages == 0)
4516                 npages = 1;
4517         if (npages > ARRAY_SIZE(pages))
4518                 return -ERANGE;
4519
4520         for (i = 0; i < npages; i++) {
4521                 pages[i] = alloc_page(GFP_KERNEL);
4522                 if (!pages[i])
4523                         goto out_free;
4524         }
4525
4526         /* for decoding across pages */
4527         res.acl_scratch = alloc_page(GFP_KERNEL);
4528         if (!res.acl_scratch)
4529                 goto out_free;
4530
4531         args.acl_len = npages * PAGE_SIZE;
4532         args.acl_pgbase = 0;
4533
4534         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4535                 __func__, buf, buflen, npages, args.acl_len);
4536         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4537                              &msg, &args.seq_args, &res.seq_res, 0);
4538         if (ret)
4539                 goto out_free;
4540
4541         /* Handle the case where the passed-in buffer is too short */
4542         if (res.acl_flags & NFS4_ACL_TRUNC) {
4543                 /* Did the user only issue a request for the acl length? */
4544                 if (buf == NULL)
4545                         goto out_ok;
4546                 ret = -ERANGE;
4547                 goto out_free;
4548         }
4549         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4550         if (buf) {
4551                 if (res.acl_len > buflen) {
4552                         ret = -ERANGE;
4553                         goto out_free;
4554                 }
4555                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4556         }
4557 out_ok:
4558         ret = res.acl_len;
4559 out_free:
4560         for (i = 0; i < npages; i++)
4561                 if (pages[i])
4562                         __free_page(pages[i]);
4563         if (res.acl_scratch)
4564                 __free_page(res.acl_scratch);
4565         return ret;
4566 }
4567
4568 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4569 {
4570         struct nfs4_exception exception = { };
4571         ssize_t ret;
4572         do {
4573                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4574                 trace_nfs4_get_acl(inode, ret);
4575                 if (ret >= 0)
4576                         break;
4577                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4578         } while (exception.retry);
4579         return ret;
4580 }
4581
4582 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4583 {
4584         struct nfs_server *server = NFS_SERVER(inode);
4585         int ret;
4586
4587         if (!nfs4_server_supports_acls(server))
4588                 return -EOPNOTSUPP;
4589         ret = nfs_revalidate_inode(server, inode);
4590         if (ret < 0)
4591                 return ret;
4592         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4593                 nfs_zap_acl_cache(inode);
4594         ret = nfs4_read_cached_acl(inode, buf, buflen);
4595         if (ret != -ENOENT)
4596                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4597                  * but no cached acl data, just the acl length */
4598                 return ret;
4599         return nfs4_get_acl_uncached(inode, buf, buflen);
4600 }
4601
4602 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4603 {
4604         struct nfs_server *server = NFS_SERVER(inode);
4605         struct page *pages[NFS4ACL_MAXPAGES];
4606         struct nfs_setaclargs arg = {
4607                 .fh             = NFS_FH(inode),
4608                 .acl_pages      = pages,
4609                 .acl_len        = buflen,
4610         };
4611         struct nfs_setaclres res;
4612         struct rpc_message msg = {
4613                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4614                 .rpc_argp       = &arg,
4615                 .rpc_resp       = &res,
4616         };
4617         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4618         int ret, i;
4619
4620         if (!nfs4_server_supports_acls(server))
4621                 return -EOPNOTSUPP;
4622         if (npages > ARRAY_SIZE(pages))
4623                 return -ERANGE;
4624         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4625         if (i < 0)
4626                 return i;
4627         nfs4_inode_return_delegation(inode);
4628         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4629
4630         /*
4631          * Free each page after tx, so the only ref left is
4632          * held by the network stack
4633          */
4634         for (; i > 0; i--)
4635                 put_page(pages[i-1]);
4636
4637         /*
4638          * Acl update can result in inode attribute update.
4639          * so mark the attribute cache invalid.
4640          */
4641         spin_lock(&inode->i_lock);
4642         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4643         spin_unlock(&inode->i_lock);
4644         nfs_access_zap_cache(inode);
4645         nfs_zap_acl_cache(inode);
4646         return ret;
4647 }
4648
4649 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4650 {
4651         struct nfs4_exception exception = { };
4652         int err;
4653         do {
4654                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4655                 trace_nfs4_set_acl(inode, err);
4656                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4657                                 &exception);
4658         } while (exception.retry);
4659         return err;
4660 }
4661
4662 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4663 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4664                                         size_t buflen)
4665 {
4666         struct nfs_server *server = NFS_SERVER(inode);
4667         struct nfs_fattr fattr;
4668         struct nfs4_label label = {0, 0, buflen, buf};
4669
4670         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4671         struct nfs4_getattr_arg arg = {
4672                 .fh             = NFS_FH(inode),
4673                 .bitmask        = bitmask,
4674         };
4675         struct nfs4_getattr_res res = {
4676                 .fattr          = &fattr,
4677                 .label          = &label,
4678                 .server         = server,
4679         };
4680         struct rpc_message msg = {
4681                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4682                 .rpc_argp       = &arg,
4683                 .rpc_resp       = &res,
4684         };
4685         int ret;
4686
4687         nfs_fattr_init(&fattr);
4688
4689         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4690         if (ret)
4691                 return ret;
4692         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4693                 return -ENOENT;
4694         if (buflen < label.len)
4695                 return -ERANGE;
4696         return 0;
4697 }
4698
4699 static int nfs4_get_security_label(struct inode *inode, void *buf,
4700                                         size_t buflen)
4701 {
4702         struct nfs4_exception exception = { };
4703         int err;
4704
4705         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4706                 return -EOPNOTSUPP;
4707
4708         do {
4709                 err = _nfs4_get_security_label(inode, buf, buflen);
4710                 trace_nfs4_get_security_label(inode, err);
4711                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4712                                 &exception);
4713         } while (exception.retry);
4714         return err;
4715 }
4716
4717 static int _nfs4_do_set_security_label(struct inode *inode,
4718                 struct nfs4_label *ilabel,
4719                 struct nfs_fattr *fattr,
4720                 struct nfs4_label *olabel)
4721 {
4722
4723         struct iattr sattr = {0};
4724         struct nfs_server *server = NFS_SERVER(inode);
4725         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4726         struct nfs_setattrargs arg = {
4727                 .fh             = NFS_FH(inode),
4728                 .iap            = &sattr,
4729                 .server         = server,
4730                 .bitmask        = bitmask,
4731                 .label          = ilabel,
4732         };
4733         struct nfs_setattrres res = {
4734                 .fattr          = fattr,
4735                 .label          = olabel,
4736                 .server         = server,
4737         };
4738         struct rpc_message msg = {
4739                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4740                 .rpc_argp       = &arg,
4741                 .rpc_resp       = &res,
4742         };
4743         int status;
4744
4745         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4746
4747         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4748         if (status)
4749                 dprintk("%s failed: %d\n", __func__, status);
4750
4751         return status;
4752 }
4753
4754 static int nfs4_do_set_security_label(struct inode *inode,
4755                 struct nfs4_label *ilabel,
4756                 struct nfs_fattr *fattr,
4757                 struct nfs4_label *olabel)
4758 {
4759         struct nfs4_exception exception = { };
4760         int err;
4761
4762         do {
4763                 err = _nfs4_do_set_security_label(inode, ilabel,
4764                                 fattr, olabel);
4765                 trace_nfs4_set_security_label(inode, err);
4766                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4767                                 &exception);
4768         } while (exception.retry);
4769         return err;
4770 }
4771
4772 static int
4773 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4774 {
4775         struct nfs4_label ilabel, *olabel = NULL;
4776         struct nfs_fattr fattr;
4777         struct rpc_cred *cred;
4778         struct inode *inode = dentry->d_inode;
4779         int status;
4780
4781         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4782                 return -EOPNOTSUPP;
4783
4784         nfs_fattr_init(&fattr);
4785
4786         ilabel.pi = 0;
4787         ilabel.lfs = 0;
4788         ilabel.label = (char *)buf;
4789         ilabel.len = buflen;
4790
4791         cred = rpc_lookup_cred();
4792         if (IS_ERR(cred))
4793                 return PTR_ERR(cred);
4794
4795         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4796         if (IS_ERR(olabel)) {
4797                 status = -PTR_ERR(olabel);
4798                 goto out;
4799         }
4800
4801         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4802         if (status == 0)
4803                 nfs_setsecurity(inode, &fattr, olabel);
4804
4805         nfs4_label_free(olabel);
4806 out:
4807         put_rpccred(cred);
4808         return status;
4809 }
4810 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4811
4812
4813 static int
4814 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4815 {
4816         struct nfs_client *clp = server->nfs_client;
4817
4818         if (task->tk_status >= 0)
4819                 return 0;
4820         switch(task->tk_status) {
4821                 case -NFS4ERR_DELEG_REVOKED:
4822                 case -NFS4ERR_ADMIN_REVOKED:
4823                 case -NFS4ERR_BAD_STATEID:
4824                         if (state == NULL)
4825                                 break;
4826                         nfs_remove_bad_delegation(state->inode);
4827                 case -NFS4ERR_OPENMODE:
4828                         if (state == NULL)
4829                                 break;
4830                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4831                                 goto recovery_failed;
4832                         goto wait_on_recovery;
4833                 case -NFS4ERR_EXPIRED:
4834                         if (state != NULL) {
4835                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4836                                         goto recovery_failed;
4837                         }
4838                 case -NFS4ERR_STALE_STATEID:
4839                 case -NFS4ERR_STALE_CLIENTID:
4840                         nfs4_schedule_lease_recovery(clp);
4841                         goto wait_on_recovery;
4842                 case -NFS4ERR_MOVED:
4843                         if (nfs4_schedule_migration_recovery(server) < 0)
4844                                 goto recovery_failed;
4845                         goto wait_on_recovery;
4846                 case -NFS4ERR_LEASE_MOVED:
4847                         nfs4_schedule_lease_moved_recovery(clp);
4848                         goto wait_on_recovery;
4849 #if defined(CONFIG_NFS_V4_1)
4850                 case -NFS4ERR_BADSESSION:
4851                 case -NFS4ERR_BADSLOT:
4852                 case -NFS4ERR_BAD_HIGH_SLOT:
4853                 case -NFS4ERR_DEADSESSION:
4854                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4855                 case -NFS4ERR_SEQ_FALSE_RETRY:
4856                 case -NFS4ERR_SEQ_MISORDERED:
4857                         dprintk("%s ERROR %d, Reset session\n", __func__,
4858                                 task->tk_status);
4859                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4860                         goto wait_on_recovery;
4861 #endif /* CONFIG_NFS_V4_1 */
4862                 case -NFS4ERR_DELAY:
4863                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4864                 case -NFS4ERR_GRACE:
4865                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4866                 case -NFS4ERR_RETRY_UNCACHED_REP:
4867                 case -NFS4ERR_OLD_STATEID:
4868                         goto restart_call;
4869         }
4870         task->tk_status = nfs4_map_errors(task->tk_status);
4871         return 0;
4872 recovery_failed:
4873         task->tk_status = -EIO;
4874         return 0;
4875 wait_on_recovery:
4876         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4877         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4878                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4879         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4880                 goto recovery_failed;
4881 restart_call:
4882         task->tk_status = 0;
4883         return -EAGAIN;
4884 }
4885
4886 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4887                                     nfs4_verifier *bootverf)
4888 {
4889         __be32 verf[2];
4890
4891         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4892                 /* An impossible timestamp guarantees this value
4893                  * will never match a generated boot time. */
4894                 verf[0] = 0;
4895                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4896         } else {
4897                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4898                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4899                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4900         }
4901         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4902 }
4903
4904 static unsigned int
4905 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4906                                    char *buf, size_t len)
4907 {
4908         unsigned int result;
4909
4910         rcu_read_lock();
4911         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4912                                 clp->cl_ipaddr,
4913                                 rpc_peeraddr2str(clp->cl_rpcclient,
4914                                                         RPC_DISPLAY_ADDR),
4915                                 rpc_peeraddr2str(clp->cl_rpcclient,
4916                                                         RPC_DISPLAY_PROTO));
4917         rcu_read_unlock();
4918         return result;
4919 }
4920
4921 static unsigned int
4922 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4923                                 char *buf, size_t len)
4924 {
4925         const char *nodename = clp->cl_rpcclient->cl_nodename;
4926
4927         if (nfs4_client_id_uniquifier[0] != '\0')
4928                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4929                                 clp->rpc_ops->version,
4930                                 clp->cl_minorversion,
4931                                 nfs4_client_id_uniquifier,
4932                                 nodename);
4933         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4934                                 clp->rpc_ops->version, clp->cl_minorversion,
4935                                 nodename);
4936 }
4937
4938 /*
4939  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4940  * services.  Advertise one based on the address family of the
4941  * clientaddr.
4942  */
4943 static unsigned int
4944 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4945 {
4946         if (strchr(clp->cl_ipaddr, ':') != NULL)
4947                 return scnprintf(buf, len, "tcp6");
4948         else
4949                 return scnprintf(buf, len, "tcp");
4950 }
4951
4952 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4953 {
4954         struct nfs4_setclientid *sc = calldata;
4955
4956         if (task->tk_status == 0)
4957                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4958 }
4959
4960 static const struct rpc_call_ops nfs4_setclientid_ops = {
4961         .rpc_call_done = nfs4_setclientid_done,
4962 };
4963
4964 /**
4965  * nfs4_proc_setclientid - Negotiate client ID
4966  * @clp: state data structure
4967  * @program: RPC program for NFSv4 callback service
4968  * @port: IP port number for NFS4 callback service
4969  * @cred: RPC credential to use for this call
4970  * @res: where to place the result
4971  *
4972  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4973  */
4974 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4975                 unsigned short port, struct rpc_cred *cred,
4976                 struct nfs4_setclientid_res *res)
4977 {
4978         nfs4_verifier sc_verifier;
4979         struct nfs4_setclientid setclientid = {
4980                 .sc_verifier = &sc_verifier,
4981                 .sc_prog = program,
4982                 .sc_cb_ident = clp->cl_cb_ident,
4983         };
4984         struct rpc_message msg = {
4985                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4986                 .rpc_argp = &setclientid,
4987                 .rpc_resp = res,
4988                 .rpc_cred = cred,
4989         };
4990         struct rpc_task *task;
4991         struct rpc_task_setup task_setup_data = {
4992                 .rpc_client = clp->cl_rpcclient,
4993                 .rpc_message = &msg,
4994                 .callback_ops = &nfs4_setclientid_ops,
4995                 .callback_data = &setclientid,
4996                 .flags = RPC_TASK_TIMEOUT,
4997         };
4998         int status;
4999
5000         /* nfs_client_id4 */
5001         nfs4_init_boot_verifier(clp, &sc_verifier);
5002         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5003                 setclientid.sc_name_len =
5004                                 nfs4_init_uniform_client_string(clp,
5005                                                 setclientid.sc_name,
5006                                                 sizeof(setclientid.sc_name));
5007         else
5008                 setclientid.sc_name_len =
5009                                 nfs4_init_nonuniform_client_string(clp,
5010                                                 setclientid.sc_name,
5011                                                 sizeof(setclientid.sc_name));
5012         /* cb_client4 */
5013         setclientid.sc_netid_len =
5014                                 nfs4_init_callback_netid(clp,
5015                                                 setclientid.sc_netid,
5016                                                 sizeof(setclientid.sc_netid));
5017         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5018                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5019                                 clp->cl_ipaddr, port >> 8, port & 255);
5020
5021         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5022                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5023                 setclientid.sc_name_len, setclientid.sc_name);
5024         task = rpc_run_task(&task_setup_data);
5025         if (IS_ERR(task)) {
5026                 status = PTR_ERR(task);
5027                 goto out;
5028         }
5029         status = task->tk_status;
5030         if (setclientid.sc_cred) {
5031                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5032                 put_rpccred(setclientid.sc_cred);
5033         }
5034         rpc_put_task(task);
5035 out:
5036         trace_nfs4_setclientid(clp, status);
5037         dprintk("NFS reply setclientid: %d\n", status);
5038         return status;
5039 }
5040
5041 /**
5042  * nfs4_proc_setclientid_confirm - Confirm client ID
5043  * @clp: state data structure
5044  * @res: result of a previous SETCLIENTID
5045  * @cred: RPC credential to use for this call
5046  *
5047  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5048  */
5049 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5050                 struct nfs4_setclientid_res *arg,
5051                 struct rpc_cred *cred)
5052 {
5053         struct rpc_message msg = {
5054                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5055                 .rpc_argp = arg,
5056                 .rpc_cred = cred,
5057         };
5058         int status;
5059
5060         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5061                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5062                 clp->cl_clientid);
5063         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5064         trace_nfs4_setclientid_confirm(clp, status);
5065         dprintk("NFS reply setclientid_confirm: %d\n", status);
5066         return status;
5067 }
5068
5069 struct nfs4_delegreturndata {
5070         struct nfs4_delegreturnargs args;
5071         struct nfs4_delegreturnres res;
5072         struct nfs_fh fh;
5073         nfs4_stateid stateid;
5074         unsigned long timestamp;
5075         struct nfs_fattr fattr;
5076         int rpc_status;
5077         struct inode *inode;
5078         bool roc;
5079         u32 roc_barrier;
5080 };
5081
5082 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5083 {
5084         struct nfs4_delegreturndata *data = calldata;
5085
5086         if (!nfs4_sequence_done(task, &data->res.seq_res))
5087                 return;
5088
5089         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5090         switch (task->tk_status) {
5091         case 0:
5092                 renew_lease(data->res.server, data->timestamp);
5093         case -NFS4ERR_ADMIN_REVOKED:
5094         case -NFS4ERR_DELEG_REVOKED:
5095         case -NFS4ERR_BAD_STATEID:
5096         case -NFS4ERR_OLD_STATEID:
5097         case -NFS4ERR_STALE_STATEID:
5098         case -NFS4ERR_EXPIRED:
5099                 task->tk_status = 0;
5100                 if (data->roc)
5101                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5102                 break;
5103         default:
5104                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
5105                                 -EAGAIN) {
5106                         rpc_restart_call_prepare(task);
5107                         return;
5108                 }
5109         }
5110         data->rpc_status = task->tk_status;
5111 }
5112
5113 static void nfs4_delegreturn_release(void *calldata)
5114 {
5115         struct nfs4_delegreturndata *data = calldata;
5116
5117         if (data->roc)
5118                 pnfs_roc_release(data->inode);
5119         kfree(calldata);
5120 }
5121
5122 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5123 {
5124         struct nfs4_delegreturndata *d_data;
5125
5126         d_data = (struct nfs4_delegreturndata *)data;
5127
5128         if (d_data->roc &&
5129             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5130                 return;
5131
5132         nfs4_setup_sequence(d_data->res.server,
5133                         &d_data->args.seq_args,
5134                         &d_data->res.seq_res,
5135                         task);
5136 }
5137
5138 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5139         .rpc_call_prepare = nfs4_delegreturn_prepare,
5140         .rpc_call_done = nfs4_delegreturn_done,
5141         .rpc_release = nfs4_delegreturn_release,
5142 };
5143
5144 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5145 {
5146         struct nfs4_delegreturndata *data;
5147         struct nfs_server *server = NFS_SERVER(inode);
5148         struct rpc_task *task;
5149         struct rpc_message msg = {
5150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5151                 .rpc_cred = cred,
5152         };
5153         struct rpc_task_setup task_setup_data = {
5154                 .rpc_client = server->client,
5155                 .rpc_message = &msg,
5156                 .callback_ops = &nfs4_delegreturn_ops,
5157                 .flags = RPC_TASK_ASYNC,
5158         };
5159         int status = 0;
5160
5161         data = kzalloc(sizeof(*data), GFP_NOFS);
5162         if (data == NULL)
5163                 return -ENOMEM;
5164         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5165         data->args.fhandle = &data->fh;
5166         data->args.stateid = &data->stateid;
5167         data->args.bitmask = server->cache_consistency_bitmask;
5168         nfs_copy_fh(&data->fh, NFS_FH(inode));
5169         nfs4_stateid_copy(&data->stateid, stateid);
5170         data->res.fattr = &data->fattr;
5171         data->res.server = server;
5172         nfs_fattr_init(data->res.fattr);
5173         data->timestamp = jiffies;
5174         data->rpc_status = 0;
5175         data->inode = inode;
5176         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5177                     pnfs_roc(inode) : false;
5178
5179         task_setup_data.callback_data = data;
5180         msg.rpc_argp = &data->args;
5181         msg.rpc_resp = &data->res;
5182         task = rpc_run_task(&task_setup_data);
5183         if (IS_ERR(task))
5184                 return PTR_ERR(task);
5185         if (!issync)
5186                 goto out;
5187         status = nfs4_wait_for_completion_rpc_task(task);
5188         if (status != 0)
5189                 goto out;
5190         status = data->rpc_status;
5191         if (status == 0)
5192                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5193         else
5194                 nfs_refresh_inode(inode, &data->fattr);
5195 out:
5196         rpc_put_task(task);
5197         return status;
5198 }
5199
5200 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5201 {
5202         struct nfs_server *server = NFS_SERVER(inode);
5203         struct nfs4_exception exception = { };
5204         int err;
5205         do {
5206                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5207                 trace_nfs4_delegreturn(inode, err);
5208                 switch (err) {
5209                         case -NFS4ERR_STALE_STATEID:
5210                         case -NFS4ERR_EXPIRED:
5211                         case 0:
5212                                 return 0;
5213                 }
5214                 err = nfs4_handle_exception(server, err, &exception);
5215         } while (exception.retry);
5216         return err;
5217 }
5218
5219 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5220 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5221
5222 /*
5223  * sleep, with exponential backoff, and retry the LOCK operation.
5224  */
5225 static unsigned long
5226 nfs4_set_lock_task_retry(unsigned long timeout)
5227 {
5228         freezable_schedule_timeout_killable_unsafe(timeout);
5229         timeout <<= 1;
5230         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5231                 return NFS4_LOCK_MAXTIMEOUT;
5232         return timeout;
5233 }
5234
5235 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5236 {
5237         struct inode *inode = state->inode;
5238         struct nfs_server *server = NFS_SERVER(inode);
5239         struct nfs_client *clp = server->nfs_client;
5240         struct nfs_lockt_args arg = {
5241                 .fh = NFS_FH(inode),
5242                 .fl = request,
5243         };
5244         struct nfs_lockt_res res = {
5245                 .denied = request,
5246         };
5247         struct rpc_message msg = {
5248                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5249                 .rpc_argp       = &arg,
5250                 .rpc_resp       = &res,
5251                 .rpc_cred       = state->owner->so_cred,
5252         };
5253         struct nfs4_lock_state *lsp;
5254         int status;
5255
5256         arg.lock_owner.clientid = clp->cl_clientid;
5257         status = nfs4_set_lock_state(state, request);
5258         if (status != 0)
5259                 goto out;
5260         lsp = request->fl_u.nfs4_fl.owner;
5261         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5262         arg.lock_owner.s_dev = server->s_dev;
5263         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5264         switch (status) {
5265                 case 0:
5266                         request->fl_type = F_UNLCK;
5267                         break;
5268                 case -NFS4ERR_DENIED:
5269                         status = 0;
5270         }
5271         request->fl_ops->fl_release_private(request);
5272         request->fl_ops = NULL;
5273 out:
5274         return status;
5275 }
5276
5277 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5278 {
5279         struct nfs4_exception exception = { };
5280         int err;
5281
5282         do {
5283                 err = _nfs4_proc_getlk(state, cmd, request);
5284                 trace_nfs4_get_lock(request, state, cmd, err);
5285                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5286                                 &exception);
5287         } while (exception.retry);
5288         return err;
5289 }
5290
5291 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5292 {
5293         int res = 0;
5294         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5295                 case FL_POSIX:
5296                         res = posix_lock_file_wait(file, fl);
5297                         break;
5298                 case FL_FLOCK:
5299                         res = flock_lock_file_wait(file, fl);
5300                         break;
5301                 default:
5302                         BUG();
5303         }
5304         return res;
5305 }
5306
5307 struct nfs4_unlockdata {
5308         struct nfs_locku_args arg;
5309         struct nfs_locku_res res;
5310         struct nfs4_lock_state *lsp;
5311         struct nfs_open_context *ctx;
5312         struct file_lock fl;
5313         const struct nfs_server *server;
5314         unsigned long timestamp;
5315 };
5316
5317 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5318                 struct nfs_open_context *ctx,
5319                 struct nfs4_lock_state *lsp,
5320                 struct nfs_seqid *seqid)
5321 {
5322         struct nfs4_unlockdata *p;
5323         struct inode *inode = lsp->ls_state->inode;
5324
5325         p = kzalloc(sizeof(*p), GFP_NOFS);
5326         if (p == NULL)
5327                 return NULL;
5328         p->arg.fh = NFS_FH(inode);
5329         p->arg.fl = &p->fl;
5330         p->arg.seqid = seqid;
5331         p->res.seqid = seqid;
5332         p->arg.stateid = &lsp->ls_stateid;
5333         p->lsp = lsp;
5334         atomic_inc(&lsp->ls_count);
5335         /* Ensure we don't close file until we're done freeing locks! */
5336         p->ctx = get_nfs_open_context(ctx);
5337         memcpy(&p->fl, fl, sizeof(p->fl));
5338         p->server = NFS_SERVER(inode);
5339         return p;
5340 }
5341
5342 static void nfs4_locku_release_calldata(void *data)
5343 {
5344         struct nfs4_unlockdata *calldata = data;
5345         nfs_free_seqid(calldata->arg.seqid);
5346         nfs4_put_lock_state(calldata->lsp);
5347         put_nfs_open_context(calldata->ctx);
5348         kfree(calldata);
5349 }
5350
5351 static void nfs4_locku_done(struct rpc_task *task, void *data)
5352 {
5353         struct nfs4_unlockdata *calldata = data;
5354
5355         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5356                 return;
5357         switch (task->tk_status) {
5358                 case 0:
5359                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5360                                         &calldata->res.stateid);
5361                         renew_lease(calldata->server, calldata->timestamp);
5362                         break;
5363                 case -NFS4ERR_BAD_STATEID:
5364                 case -NFS4ERR_OLD_STATEID:
5365                 case -NFS4ERR_STALE_STATEID:
5366                 case -NFS4ERR_EXPIRED:
5367                         break;
5368                 default:
5369                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5370                                 rpc_restart_call_prepare(task);
5371         }
5372         nfs_release_seqid(calldata->arg.seqid);
5373 }
5374
5375 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5376 {
5377         struct nfs4_unlockdata *calldata = data;
5378
5379         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5380                 goto out_wait;
5381         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5382                 /* Note: exit _without_ running nfs4_locku_done */
5383                 goto out_no_action;
5384         }
5385         calldata->timestamp = jiffies;
5386         if (nfs4_setup_sequence(calldata->server,
5387                                 &calldata->arg.seq_args,
5388                                 &calldata->res.seq_res,
5389                                 task) != 0)
5390                 nfs_release_seqid(calldata->arg.seqid);
5391         return;
5392 out_no_action:
5393         task->tk_action = NULL;
5394 out_wait:
5395         nfs4_sequence_done(task, &calldata->res.seq_res);
5396 }
5397
5398 static const struct rpc_call_ops nfs4_locku_ops = {
5399         .rpc_call_prepare = nfs4_locku_prepare,
5400         .rpc_call_done = nfs4_locku_done,
5401         .rpc_release = nfs4_locku_release_calldata,
5402 };
5403
5404 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5405                 struct nfs_open_context *ctx,
5406                 struct nfs4_lock_state *lsp,
5407                 struct nfs_seqid *seqid)
5408 {
5409         struct nfs4_unlockdata *data;
5410         struct rpc_message msg = {
5411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5412                 .rpc_cred = ctx->cred,
5413         };
5414         struct rpc_task_setup task_setup_data = {
5415                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5416                 .rpc_message = &msg,
5417                 .callback_ops = &nfs4_locku_ops,
5418                 .workqueue = nfsiod_workqueue,
5419                 .flags = RPC_TASK_ASYNC,
5420         };
5421
5422         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5423                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5424
5425         /* Ensure this is an unlock - when canceling a lock, the
5426          * canceled lock is passed in, and it won't be an unlock.
5427          */
5428         fl->fl_type = F_UNLCK;
5429
5430         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5431         if (data == NULL) {
5432                 nfs_free_seqid(seqid);
5433                 return ERR_PTR(-ENOMEM);
5434         }
5435
5436         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5437         msg.rpc_argp = &data->arg;
5438         msg.rpc_resp = &data->res;
5439         task_setup_data.callback_data = data;
5440         return rpc_run_task(&task_setup_data);
5441 }
5442
5443 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5444 {
5445         struct inode *inode = state->inode;
5446         struct nfs4_state_owner *sp = state->owner;
5447         struct nfs_inode *nfsi = NFS_I(inode);
5448         struct nfs_seqid *seqid;
5449         struct nfs4_lock_state *lsp;
5450         struct rpc_task *task;
5451         int status = 0;
5452         unsigned char fl_flags = request->fl_flags;
5453
5454         status = nfs4_set_lock_state(state, request);
5455         /* Unlock _before_ we do the RPC call */
5456         request->fl_flags |= FL_EXISTS;
5457         /* Exclude nfs_delegation_claim_locks() */
5458         mutex_lock(&sp->so_delegreturn_mutex);
5459         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5460         down_read(&nfsi->rwsem);
5461         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5462                 up_read(&nfsi->rwsem);
5463                 mutex_unlock(&sp->so_delegreturn_mutex);
5464                 goto out;
5465         }
5466         up_read(&nfsi->rwsem);
5467         mutex_unlock(&sp->so_delegreturn_mutex);
5468         if (status != 0)
5469                 goto out;
5470         /* Is this a delegated lock? */
5471         lsp = request->fl_u.nfs4_fl.owner;
5472         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5473                 goto out;
5474         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5475         status = -ENOMEM;
5476         if (seqid == NULL)
5477                 goto out;
5478         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5479         status = PTR_ERR(task);
5480         if (IS_ERR(task))
5481                 goto out;
5482         status = nfs4_wait_for_completion_rpc_task(task);
5483         rpc_put_task(task);
5484 out:
5485         request->fl_flags = fl_flags;
5486         trace_nfs4_unlock(request, state, F_SETLK, status);
5487         return status;
5488 }
5489
5490 struct nfs4_lockdata {
5491         struct nfs_lock_args arg;
5492         struct nfs_lock_res res;
5493         struct nfs4_lock_state *lsp;
5494         struct nfs_open_context *ctx;
5495         struct file_lock fl;
5496         unsigned long timestamp;
5497         int rpc_status;
5498         int cancelled;
5499         struct nfs_server *server;
5500 };
5501
5502 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5503                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5504                 gfp_t gfp_mask)
5505 {
5506         struct nfs4_lockdata *p;
5507         struct inode *inode = lsp->ls_state->inode;
5508         struct nfs_server *server = NFS_SERVER(inode);
5509
5510         p = kzalloc(sizeof(*p), gfp_mask);
5511         if (p == NULL)
5512                 return NULL;
5513
5514         p->arg.fh = NFS_FH(inode);
5515         p->arg.fl = &p->fl;
5516         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5517         if (p->arg.open_seqid == NULL)
5518                 goto out_free;
5519         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5520         if (p->arg.lock_seqid == NULL)
5521                 goto out_free_seqid;
5522         p->arg.lock_stateid = &lsp->ls_stateid;
5523         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5524         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5525         p->arg.lock_owner.s_dev = server->s_dev;
5526         p->res.lock_seqid = p->arg.lock_seqid;
5527         p->lsp = lsp;
5528         p->server = server;
5529         atomic_inc(&lsp->ls_count);
5530         p->ctx = get_nfs_open_context(ctx);
5531         memcpy(&p->fl, fl, sizeof(p->fl));
5532         return p;
5533 out_free_seqid:
5534         nfs_free_seqid(p->arg.open_seqid);
5535 out_free:
5536         kfree(p);
5537         return NULL;
5538 }
5539
5540 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5541 {
5542         struct nfs4_lockdata *data = calldata;
5543         struct nfs4_state *state = data->lsp->ls_state;
5544
5545         dprintk("%s: begin!\n", __func__);
5546         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5547                 goto out_wait;
5548         /* Do we need to do an open_to_lock_owner? */
5549         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5550                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5551                         goto out_release_lock_seqid;
5552                 }
5553                 data->arg.open_stateid = &state->open_stateid;
5554                 data->arg.new_lock_owner = 1;
5555                 data->res.open_seqid = data->arg.open_seqid;
5556         } else
5557                 data->arg.new_lock_owner = 0;
5558         if (!nfs4_valid_open_stateid(state)) {
5559                 data->rpc_status = -EBADF;
5560                 task->tk_action = NULL;
5561                 goto out_release_open_seqid;
5562         }
5563         data->timestamp = jiffies;
5564         if (nfs4_setup_sequence(data->server,
5565                                 &data->arg.seq_args,
5566                                 &data->res.seq_res,
5567                                 task) == 0)
5568                 return;
5569 out_release_open_seqid:
5570         nfs_release_seqid(data->arg.open_seqid);
5571 out_release_lock_seqid:
5572         nfs_release_seqid(data->arg.lock_seqid);
5573 out_wait:
5574         nfs4_sequence_done(task, &data->res.seq_res);
5575         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5576 }
5577
5578 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5579 {
5580         struct nfs4_lockdata *data = calldata;
5581
5582         dprintk("%s: begin!\n", __func__);
5583
5584         if (!nfs4_sequence_done(task, &data->res.seq_res))
5585                 return;
5586
5587         data->rpc_status = task->tk_status;
5588         if (data->arg.new_lock_owner != 0) {
5589                 if (data->rpc_status == 0)
5590                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5591                 else
5592                         goto out;
5593         }
5594         if (data->rpc_status == 0) {
5595                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5596                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5597                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5598         }
5599 out:
5600         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5601 }
5602
5603 static void nfs4_lock_release(void *calldata)
5604 {
5605         struct nfs4_lockdata *data = calldata;
5606
5607         dprintk("%s: begin!\n", __func__);
5608         nfs_free_seqid(data->arg.open_seqid);
5609         if (data->cancelled != 0) {
5610                 struct rpc_task *task;
5611                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5612                                 data->arg.lock_seqid);
5613                 if (!IS_ERR(task))
5614                         rpc_put_task_async(task);
5615                 dprintk("%s: cancelling lock!\n", __func__);
5616         } else
5617                 nfs_free_seqid(data->arg.lock_seqid);
5618         nfs4_put_lock_state(data->lsp);
5619         put_nfs_open_context(data->ctx);
5620         kfree(data);
5621         dprintk("%s: done!\n", __func__);
5622 }
5623
5624 static const struct rpc_call_ops nfs4_lock_ops = {
5625         .rpc_call_prepare = nfs4_lock_prepare,
5626         .rpc_call_done = nfs4_lock_done,
5627         .rpc_release = nfs4_lock_release,
5628 };
5629
5630 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5631 {
5632         switch (error) {
5633         case -NFS4ERR_ADMIN_REVOKED:
5634         case -NFS4ERR_BAD_STATEID:
5635                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5636                 if (new_lock_owner != 0 ||
5637                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5638                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5639                 break;
5640         case -NFS4ERR_STALE_STATEID:
5641                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5642         case -NFS4ERR_EXPIRED:
5643                 nfs4_schedule_lease_recovery(server->nfs_client);
5644         };
5645 }
5646
5647 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5648 {
5649         struct nfs4_lockdata *data;
5650         struct rpc_task *task;
5651         struct rpc_message msg = {
5652                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5653                 .rpc_cred = state->owner->so_cred,
5654         };
5655         struct rpc_task_setup task_setup_data = {
5656                 .rpc_client = NFS_CLIENT(state->inode),
5657                 .rpc_message = &msg,
5658                 .callback_ops = &nfs4_lock_ops,
5659                 .workqueue = nfsiod_workqueue,
5660                 .flags = RPC_TASK_ASYNC,
5661         };
5662         int ret;
5663
5664         dprintk("%s: begin!\n", __func__);
5665         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5666                         fl->fl_u.nfs4_fl.owner,
5667                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5668         if (data == NULL)
5669                 return -ENOMEM;
5670         if (IS_SETLKW(cmd))
5671                 data->arg.block = 1;
5672         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5673         msg.rpc_argp = &data->arg;
5674         msg.rpc_resp = &data->res;
5675         task_setup_data.callback_data = data;
5676         if (recovery_type > NFS_LOCK_NEW) {
5677                 if (recovery_type == NFS_LOCK_RECLAIM)
5678                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5679                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5680         }
5681         task = rpc_run_task(&task_setup_data);
5682         if (IS_ERR(task))
5683                 return PTR_ERR(task);
5684         ret = nfs4_wait_for_completion_rpc_task(task);
5685         if (ret == 0) {
5686                 ret = data->rpc_status;
5687                 if (ret)
5688                         nfs4_handle_setlk_error(data->server, data->lsp,
5689                                         data->arg.new_lock_owner, ret);
5690         } else
5691                 data->cancelled = 1;
5692         rpc_put_task(task);
5693         dprintk("%s: done, ret = %d!\n", __func__, ret);
5694         return ret;
5695 }
5696
5697 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5698 {
5699         struct nfs_server *server = NFS_SERVER(state->inode);
5700         struct nfs4_exception exception = {
5701                 .inode = state->inode,
5702         };
5703         int err;
5704
5705         do {
5706                 /* Cache the lock if possible... */
5707                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5708                         return 0;
5709                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5710                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5711                 if (err != -NFS4ERR_DELAY)
5712                         break;
5713                 nfs4_handle_exception(server, err, &exception);
5714         } while (exception.retry);
5715         return err;
5716 }
5717
5718 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5719 {
5720         struct nfs_server *server = NFS_SERVER(state->inode);
5721         struct nfs4_exception exception = {
5722                 .inode = state->inode,
5723         };
5724         int err;
5725
5726         err = nfs4_set_lock_state(state, request);
5727         if (err != 0)
5728                 return err;
5729         if (!recover_lost_locks) {
5730                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5731                 return 0;
5732         }
5733         do {
5734                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5735                         return 0;
5736                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5737                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5738                 switch (err) {
5739                 default:
5740                         goto out;
5741                 case -NFS4ERR_GRACE:
5742                 case -NFS4ERR_DELAY:
5743                         nfs4_handle_exception(server, err, &exception);
5744                         err = 0;
5745                 }
5746         } while (exception.retry);
5747 out:
5748         return err;
5749 }
5750
5751 #if defined(CONFIG_NFS_V4_1)
5752 /**
5753  * nfs41_check_expired_locks - possibly free a lock stateid
5754  *
5755  * @state: NFSv4 state for an inode
5756  *
5757  * Returns NFS_OK if recovery for this stateid is now finished.
5758  * Otherwise a negative NFS4ERR value is returned.
5759  */
5760 static int nfs41_check_expired_locks(struct nfs4_state *state)
5761 {
5762         int status, ret = -NFS4ERR_BAD_STATEID;
5763         struct nfs4_lock_state *lsp;
5764         struct nfs_server *server = NFS_SERVER(state->inode);
5765
5766         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5767                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5768                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5769
5770                         status = nfs41_test_stateid(server,
5771                                         &lsp->ls_stateid,
5772                                         cred);
5773                         trace_nfs4_test_lock_stateid(state, lsp, status);
5774                         if (status != NFS_OK) {
5775                                 /* Free the stateid unless the server
5776                                  * informs us the stateid is unrecognized. */
5777                                 if (status != -NFS4ERR_BAD_STATEID)
5778                                         nfs41_free_stateid(server,
5779                                                         &lsp->ls_stateid,
5780                                                         cred);
5781                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5782                                 ret = status;
5783                         }
5784                 }
5785         };
5786
5787         return ret;
5788 }
5789
5790 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5791 {
5792         int status = NFS_OK;
5793
5794         if (test_bit(LK_STATE_IN_USE, &state->flags))
5795                 status = nfs41_check_expired_locks(state);
5796         if (status != NFS_OK)
5797                 status = nfs4_lock_expired(state, request);
5798         return status;
5799 }
5800 #endif
5801
5802 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5803 {
5804         struct nfs4_state_owner *sp = state->owner;
5805         struct nfs_inode *nfsi = NFS_I(state->inode);
5806         unsigned char fl_flags = request->fl_flags;
5807         unsigned int seq;
5808         int status = -ENOLCK;
5809
5810         if ((fl_flags & FL_POSIX) &&
5811                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5812                 goto out;
5813         /* Is this a delegated open? */
5814         status = nfs4_set_lock_state(state, request);
5815         if (status != 0)
5816                 goto out;
5817         request->fl_flags |= FL_ACCESS;
5818         status = do_vfs_lock(request->fl_file, request);
5819         if (status < 0)
5820                 goto out;
5821         down_read(&nfsi->rwsem);
5822         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5823                 /* Yes: cache locks! */
5824                 /* ...but avoid races with delegation recall... */
5825                 request->fl_flags = fl_flags & ~FL_SLEEP;
5826                 status = do_vfs_lock(request->fl_file, request);
5827                 goto out_unlock;
5828         }
5829         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5830         up_read(&nfsi->rwsem);
5831         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5832         if (status != 0)
5833                 goto out;
5834         down_read(&nfsi->rwsem);
5835         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5836                 status = -NFS4ERR_DELAY;
5837                 goto out_unlock;
5838         }
5839         /* Note: we always want to sleep here! */
5840         request->fl_flags = fl_flags | FL_SLEEP;
5841         if (do_vfs_lock(request->fl_file, request) < 0)
5842                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5843                         "manager!\n", __func__);
5844 out_unlock:
5845         up_read(&nfsi->rwsem);
5846 out:
5847         request->fl_flags = fl_flags;
5848         return status;
5849 }
5850
5851 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5852 {
5853         struct nfs4_exception exception = {
5854                 .state = state,
5855                 .inode = state->inode,
5856         };
5857         int err;
5858
5859         do {
5860                 err = _nfs4_proc_setlk(state, cmd, request);
5861                 trace_nfs4_set_lock(request, state, cmd, err);
5862                 if (err == -NFS4ERR_DENIED)
5863                         err = -EAGAIN;
5864                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5865                                 err, &exception);
5866         } while (exception.retry);
5867         return err;
5868 }
5869
5870 static int
5871 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5872 {
5873         struct nfs_open_context *ctx;
5874         struct nfs4_state *state;
5875         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5876         int status;
5877
5878         /* verify open state */
5879         ctx = nfs_file_open_context(filp);
5880         state = ctx->state;
5881
5882         if (request->fl_start < 0 || request->fl_end < 0)
5883                 return -EINVAL;
5884
5885         if (IS_GETLK(cmd)) {
5886                 if (state != NULL)
5887                         return nfs4_proc_getlk(state, F_GETLK, request);
5888                 return 0;
5889         }
5890
5891         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5892                 return -EINVAL;
5893
5894         if (request->fl_type == F_UNLCK) {
5895                 if (state != NULL)
5896                         return nfs4_proc_unlck(state, cmd, request);
5897                 return 0;
5898         }
5899
5900         if (state == NULL)
5901                 return -ENOLCK;
5902         /*
5903          * Don't rely on the VFS having checked the file open mode,
5904          * since it won't do this for flock() locks.
5905          */
5906         switch (request->fl_type) {
5907         case F_RDLCK:
5908                 if (!(filp->f_mode & FMODE_READ))
5909                         return -EBADF;
5910                 break;
5911         case F_WRLCK:
5912                 if (!(filp->f_mode & FMODE_WRITE))
5913                         return -EBADF;
5914         }
5915
5916         do {
5917                 status = nfs4_proc_setlk(state, cmd, request);
5918                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5919                         break;
5920                 timeout = nfs4_set_lock_task_retry(timeout);
5921                 status = -ERESTARTSYS;
5922                 if (signalled())
5923                         break;
5924         } while(status < 0);
5925         return status;
5926 }
5927
5928 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5929 {
5930         struct nfs_server *server = NFS_SERVER(state->inode);
5931         int err;
5932
5933         err = nfs4_set_lock_state(state, fl);
5934         if (err != 0)
5935                 return err;
5936         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5937         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5938 }
5939
5940 struct nfs_release_lockowner_data {
5941         struct nfs4_lock_state *lsp;
5942         struct nfs_server *server;
5943         struct nfs_release_lockowner_args args;
5944         struct nfs_release_lockowner_res res;
5945         unsigned long timestamp;
5946 };
5947
5948 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5949 {
5950         struct nfs_release_lockowner_data *data = calldata;
5951         struct nfs_server *server = data->server;
5952         nfs40_setup_sequence(server, &data->args.seq_args,
5953                                 &data->res.seq_res, task);
5954         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5955         data->timestamp = jiffies;
5956 }
5957
5958 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5959 {
5960         struct nfs_release_lockowner_data *data = calldata;
5961         struct nfs_server *server = data->server;
5962
5963         nfs40_sequence_done(task, &data->res.seq_res);
5964
5965         switch (task->tk_status) {
5966         case 0:
5967                 renew_lease(server, data->timestamp);
5968                 break;
5969         case -NFS4ERR_STALE_CLIENTID:
5970         case -NFS4ERR_EXPIRED:
5971                 nfs4_schedule_lease_recovery(server->nfs_client);
5972                 break;
5973         case -NFS4ERR_LEASE_MOVED:
5974         case -NFS4ERR_DELAY:
5975                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5976                         rpc_restart_call_prepare(task);
5977         }
5978 }
5979
5980 static void nfs4_release_lockowner_release(void *calldata)
5981 {
5982         struct nfs_release_lockowner_data *data = calldata;
5983         nfs4_free_lock_state(data->server, data->lsp);
5984         kfree(calldata);
5985 }
5986
5987 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5988         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5989         .rpc_call_done = nfs4_release_lockowner_done,
5990         .rpc_release = nfs4_release_lockowner_release,
5991 };
5992
5993 static void
5994 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5995 {
5996         struct nfs_release_lockowner_data *data;
5997         struct rpc_message msg = {
5998                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5999         };
6000
6001         if (server->nfs_client->cl_mvops->minor_version != 0)
6002                 return;
6003
6004         data = kmalloc(sizeof(*data), GFP_NOFS);
6005         if (!data)
6006                 return;
6007         data->lsp = lsp;
6008         data->server = server;
6009         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6010         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6011         data->args.lock_owner.s_dev = server->s_dev;
6012
6013         msg.rpc_argp = &data->args;
6014         msg.rpc_resp = &data->res;
6015         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6016         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6017 }
6018
6019 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6020
6021 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6022                                    const void *buf, size_t buflen,
6023                                    int flags, int type)
6024 {
6025         if (strcmp(key, "") != 0)
6026                 return -EINVAL;
6027
6028         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6029 }
6030
6031 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6032                                    void *buf, size_t buflen, int type)
6033 {
6034         if (strcmp(key, "") != 0)
6035                 return -EINVAL;
6036
6037         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6038 }
6039
6040 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6041                                        size_t list_len, const char *name,
6042                                        size_t name_len, int type)
6043 {
6044         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6045
6046         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6047                 return 0;
6048
6049         if (list && len <= list_len)
6050                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6051         return len;
6052 }
6053
6054 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6055 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6056 {
6057         return server->caps & NFS_CAP_SECURITY_LABEL;
6058 }
6059
6060 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6061                                    const void *buf, size_t buflen,
6062                                    int flags, int type)
6063 {
6064         if (security_ismaclabel(key))
6065                 return nfs4_set_security_label(dentry, buf, buflen);
6066
6067         return -EOPNOTSUPP;
6068 }
6069
6070 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6071                                    void *buf, size_t buflen, int type)
6072 {
6073         if (security_ismaclabel(key))
6074                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6075         return -EOPNOTSUPP;
6076 }
6077
6078 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6079                                        size_t list_len, const char *name,
6080                                        size_t name_len, int type)
6081 {
6082         size_t len = 0;
6083
6084         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6085                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6086                 if (list && len <= list_len)
6087                         security_inode_listsecurity(dentry->d_inode, list, len);
6088         }
6089         return len;
6090 }
6091
6092 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6093         .prefix = XATTR_SECURITY_PREFIX,
6094         .list   = nfs4_xattr_list_nfs4_label,
6095         .get    = nfs4_xattr_get_nfs4_label,
6096         .set    = nfs4_xattr_set_nfs4_label,
6097 };
6098 #endif
6099
6100
6101 /*
6102  * nfs_fhget will use either the mounted_on_fileid or the fileid
6103  */
6104 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6105 {
6106         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6107                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6108               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6109               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6110                 return;
6111
6112         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6113                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6114         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6115         fattr->nlink = 2;
6116 }
6117
6118 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6119                                    const struct qstr *name,
6120                                    struct nfs4_fs_locations *fs_locations,
6121                                    struct page *page)
6122 {
6123         struct nfs_server *server = NFS_SERVER(dir);
6124         u32 bitmask[3] = {
6125                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6126         };
6127         struct nfs4_fs_locations_arg args = {
6128                 .dir_fh = NFS_FH(dir),
6129                 .name = name,
6130                 .page = page,
6131                 .bitmask = bitmask,
6132         };
6133         struct nfs4_fs_locations_res res = {
6134                 .fs_locations = fs_locations,
6135         };
6136         struct rpc_message msg = {
6137                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6138                 .rpc_argp = &args,
6139                 .rpc_resp = &res,
6140         };
6141         int status;
6142
6143         dprintk("%s: start\n", __func__);
6144
6145         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6146          * is not supported */
6147         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6148                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6149         else
6150                 bitmask[0] |= FATTR4_WORD0_FILEID;
6151
6152         nfs_fattr_init(&fs_locations->fattr);
6153         fs_locations->server = server;
6154         fs_locations->nlocations = 0;
6155         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6156         dprintk("%s: returned status = %d\n", __func__, status);
6157         return status;
6158 }
6159
6160 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6161                            const struct qstr *name,
6162                            struct nfs4_fs_locations *fs_locations,
6163                            struct page *page)
6164 {
6165         struct nfs4_exception exception = { };
6166         int err;
6167         do {
6168                 err = _nfs4_proc_fs_locations(client, dir, name,
6169                                 fs_locations, page);
6170                 trace_nfs4_get_fs_locations(dir, name, err);
6171                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6172                                 &exception);
6173         } while (exception.retry);
6174         return err;
6175 }
6176
6177 /*
6178  * This operation also signals the server that this client is
6179  * performing migration recovery.  The server can stop returning
6180  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6181  * appended to this compound to identify the client ID which is
6182  * performing recovery.
6183  */
6184 static int _nfs40_proc_get_locations(struct inode *inode,
6185                                      struct nfs4_fs_locations *locations,
6186                                      struct page *page, struct rpc_cred *cred)
6187 {
6188         struct nfs_server *server = NFS_SERVER(inode);
6189         struct rpc_clnt *clnt = server->client;
6190         u32 bitmask[2] = {
6191                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6192         };
6193         struct nfs4_fs_locations_arg args = {
6194                 .clientid       = server->nfs_client->cl_clientid,
6195                 .fh             = NFS_FH(inode),
6196                 .page           = page,
6197                 .bitmask        = bitmask,
6198                 .migration      = 1,            /* skip LOOKUP */
6199                 .renew          = 1,            /* append RENEW */
6200         };
6201         struct nfs4_fs_locations_res res = {
6202                 .fs_locations   = locations,
6203                 .migration      = 1,
6204                 .renew          = 1,
6205         };
6206         struct rpc_message msg = {
6207                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6208                 .rpc_argp       = &args,
6209                 .rpc_resp       = &res,
6210                 .rpc_cred       = cred,
6211         };
6212         unsigned long now = jiffies;
6213         int status;
6214
6215         nfs_fattr_init(&locations->fattr);
6216         locations->server = server;
6217         locations->nlocations = 0;
6218
6219         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6220         nfs4_set_sequence_privileged(&args.seq_args);
6221         status = nfs4_call_sync_sequence(clnt, server, &msg,
6222                                         &args.seq_args, &res.seq_res);
6223         if (status)
6224                 return status;
6225
6226         renew_lease(server, now);
6227         return 0;
6228 }
6229
6230 #ifdef CONFIG_NFS_V4_1
6231
6232 /*
6233  * This operation also signals the server that this client is
6234  * performing migration recovery.  The server can stop asserting
6235  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6236  * performing this operation is identified in the SEQUENCE
6237  * operation in this compound.
6238  *
6239  * When the client supports GETATTR(fs_locations_info), it can
6240  * be plumbed in here.
6241  */
6242 static int _nfs41_proc_get_locations(struct inode *inode,
6243                                      struct nfs4_fs_locations *locations,
6244                                      struct page *page, struct rpc_cred *cred)
6245 {
6246         struct nfs_server *server = NFS_SERVER(inode);
6247         struct rpc_clnt *clnt = server->client;
6248         u32 bitmask[2] = {
6249                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6250         };
6251         struct nfs4_fs_locations_arg args = {
6252                 .fh             = NFS_FH(inode),
6253                 .page           = page,
6254                 .bitmask        = bitmask,
6255                 .migration      = 1,            /* skip LOOKUP */
6256         };
6257         struct nfs4_fs_locations_res res = {
6258                 .fs_locations   = locations,
6259                 .migration      = 1,
6260         };
6261         struct rpc_message msg = {
6262                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6263                 .rpc_argp       = &args,
6264                 .rpc_resp       = &res,
6265                 .rpc_cred       = cred,
6266         };
6267         int status;
6268
6269         nfs_fattr_init(&locations->fattr);
6270         locations->server = server;
6271         locations->nlocations = 0;
6272
6273         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6274         nfs4_set_sequence_privileged(&args.seq_args);
6275         status = nfs4_call_sync_sequence(clnt, server, &msg,
6276                                         &args.seq_args, &res.seq_res);
6277         if (status == NFS4_OK &&
6278             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6279                 status = -NFS4ERR_LEASE_MOVED;
6280         return status;
6281 }
6282
6283 #endif  /* CONFIG_NFS_V4_1 */
6284
6285 /**
6286  * nfs4_proc_get_locations - discover locations for a migrated FSID
6287  * @inode: inode on FSID that is migrating
6288  * @locations: result of query
6289  * @page: buffer
6290  * @cred: credential to use for this operation
6291  *
6292  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6293  * operation failed, or a negative errno if a local error occurred.
6294  *
6295  * On success, "locations" is filled in, but if the server has
6296  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6297  * asserted.
6298  *
6299  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6300  * from this client that require migration recovery.
6301  */
6302 int nfs4_proc_get_locations(struct inode *inode,
6303                             struct nfs4_fs_locations *locations,
6304                             struct page *page, struct rpc_cred *cred)
6305 {
6306         struct nfs_server *server = NFS_SERVER(inode);
6307         struct nfs_client *clp = server->nfs_client;
6308         const struct nfs4_mig_recovery_ops *ops =
6309                                         clp->cl_mvops->mig_recovery_ops;
6310         struct nfs4_exception exception = { };
6311         int status;
6312
6313         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6314                 (unsigned long long)server->fsid.major,
6315                 (unsigned long long)server->fsid.minor,
6316                 clp->cl_hostname);
6317         nfs_display_fhandle(NFS_FH(inode), __func__);
6318
6319         do {
6320                 status = ops->get_locations(inode, locations, page, cred);
6321                 if (status != -NFS4ERR_DELAY)
6322                         break;
6323                 nfs4_handle_exception(server, status, &exception);
6324         } while (exception.retry);
6325         return status;
6326 }
6327
6328 /*
6329  * This operation also signals the server that this client is
6330  * performing "lease moved" recovery.  The server can stop
6331  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6332  * is appended to this compound to identify the client ID which is
6333  * performing recovery.
6334  */
6335 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6336 {
6337         struct nfs_server *server = NFS_SERVER(inode);
6338         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6339         struct rpc_clnt *clnt = server->client;
6340         struct nfs4_fsid_present_arg args = {
6341                 .fh             = NFS_FH(inode),
6342                 .clientid       = clp->cl_clientid,
6343                 .renew          = 1,            /* append RENEW */
6344         };
6345         struct nfs4_fsid_present_res res = {
6346                 .renew          = 1,
6347         };
6348         struct rpc_message msg = {
6349                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6350                 .rpc_argp       = &args,
6351                 .rpc_resp       = &res,
6352                 .rpc_cred       = cred,
6353         };
6354         unsigned long now = jiffies;
6355         int status;
6356
6357         res.fh = nfs_alloc_fhandle();
6358         if (res.fh == NULL)
6359                 return -ENOMEM;
6360
6361         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6362         nfs4_set_sequence_privileged(&args.seq_args);
6363         status = nfs4_call_sync_sequence(clnt, server, &msg,
6364                                                 &args.seq_args, &res.seq_res);
6365         nfs_free_fhandle(res.fh);
6366         if (status)
6367                 return status;
6368
6369         do_renew_lease(clp, now);
6370         return 0;
6371 }
6372
6373 #ifdef CONFIG_NFS_V4_1
6374
6375 /*
6376  * This operation also signals the server that this client is
6377  * performing "lease moved" recovery.  The server can stop asserting
6378  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6379  * this operation is identified in the SEQUENCE operation in this
6380  * compound.
6381  */
6382 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6383 {
6384         struct nfs_server *server = NFS_SERVER(inode);
6385         struct rpc_clnt *clnt = server->client;
6386         struct nfs4_fsid_present_arg args = {
6387                 .fh             = NFS_FH(inode),
6388         };
6389         struct nfs4_fsid_present_res res = {
6390         };
6391         struct rpc_message msg = {
6392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6393                 .rpc_argp       = &args,
6394                 .rpc_resp       = &res,
6395                 .rpc_cred       = cred,
6396         };
6397         int status;
6398
6399         res.fh = nfs_alloc_fhandle();
6400         if (res.fh == NULL)
6401                 return -ENOMEM;
6402
6403         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6404         nfs4_set_sequence_privileged(&args.seq_args);
6405         status = nfs4_call_sync_sequence(clnt, server, &msg,
6406                                                 &args.seq_args, &res.seq_res);
6407         nfs_free_fhandle(res.fh);
6408         if (status == NFS4_OK &&
6409             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6410                 status = -NFS4ERR_LEASE_MOVED;
6411         return status;
6412 }
6413
6414 #endif  /* CONFIG_NFS_V4_1 */
6415
6416 /**
6417  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6418  * @inode: inode on FSID to check
6419  * @cred: credential to use for this operation
6420  *
6421  * Server indicates whether the FSID is present, moved, or not
6422  * recognized.  This operation is necessary to clear a LEASE_MOVED
6423  * condition for this client ID.
6424  *
6425  * Returns NFS4_OK if the FSID is present on this server,
6426  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6427  *  NFS4ERR code if some error occurred on the server, or a
6428  *  negative errno if a local failure occurred.
6429  */
6430 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6431 {
6432         struct nfs_server *server = NFS_SERVER(inode);
6433         struct nfs_client *clp = server->nfs_client;
6434         const struct nfs4_mig_recovery_ops *ops =
6435                                         clp->cl_mvops->mig_recovery_ops;
6436         struct nfs4_exception exception = { };
6437         int status;
6438
6439         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6440                 (unsigned long long)server->fsid.major,
6441                 (unsigned long long)server->fsid.minor,
6442                 clp->cl_hostname);
6443         nfs_display_fhandle(NFS_FH(inode), __func__);
6444
6445         do {
6446                 status = ops->fsid_present(inode, cred);
6447                 if (status != -NFS4ERR_DELAY)
6448                         break;
6449                 nfs4_handle_exception(server, status, &exception);
6450         } while (exception.retry);
6451         return status;
6452 }
6453
6454 /**
6455  * If 'use_integrity' is true and the state managment nfs_client
6456  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6457  * and the machine credential as per RFC3530bis and RFC5661 Security
6458  * Considerations sections. Otherwise, just use the user cred with the
6459  * filesystem's rpc_client.
6460  */
6461 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6462 {
6463         int status;
6464         struct nfs4_secinfo_arg args = {
6465                 .dir_fh = NFS_FH(dir),
6466                 .name   = name,
6467         };
6468         struct nfs4_secinfo_res res = {
6469                 .flavors     = flavors,
6470         };
6471         struct rpc_message msg = {
6472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6473                 .rpc_argp = &args,
6474                 .rpc_resp = &res,
6475         };
6476         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6477         struct rpc_cred *cred = NULL;
6478
6479         if (use_integrity) {
6480                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6481                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6482                 msg.rpc_cred = cred;
6483         }
6484
6485         dprintk("NFS call  secinfo %s\n", name->name);
6486
6487         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6488                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6489
6490         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6491                                 &res.seq_res, 0);
6492         dprintk("NFS reply  secinfo: %d\n", status);
6493
6494         if (cred)
6495                 put_rpccred(cred);
6496
6497         return status;
6498 }
6499
6500 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6501                       struct nfs4_secinfo_flavors *flavors)
6502 {
6503         struct nfs4_exception exception = { };
6504         int err;
6505         do {
6506                 err = -NFS4ERR_WRONGSEC;
6507
6508                 /* try to use integrity protection with machine cred */
6509                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6510                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6511
6512                 /*
6513                  * if unable to use integrity protection, or SECINFO with
6514                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6515                  * disallowed by spec, but exists in deployed servers) use
6516                  * the current filesystem's rpc_client and the user cred.
6517                  */
6518                 if (err == -NFS4ERR_WRONGSEC)
6519                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6520
6521                 trace_nfs4_secinfo(dir, name, err);
6522                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6523                                 &exception);
6524         } while (exception.retry);
6525         return err;
6526 }
6527
6528 #ifdef CONFIG_NFS_V4_1
6529 /*
6530  * Check the exchange flags returned by the server for invalid flags, having
6531  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6532  * DS flags set.
6533  */
6534 static int nfs4_check_cl_exchange_flags(u32 flags)
6535 {
6536         if (flags & ~EXCHGID4_FLAG_MASK_R)
6537                 goto out_inval;
6538         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6539             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6540                 goto out_inval;
6541         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6542                 goto out_inval;
6543         return NFS_OK;
6544 out_inval:
6545         return -NFS4ERR_INVAL;
6546 }
6547
6548 static bool
6549 nfs41_same_server_scope(struct nfs41_server_scope *a,
6550                         struct nfs41_server_scope *b)
6551 {
6552         if (a->server_scope_sz == b->server_scope_sz &&
6553             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6554                 return true;
6555
6556         return false;
6557 }
6558
6559 /*
6560  * nfs4_proc_bind_conn_to_session()
6561  *
6562  * The 4.1 client currently uses the same TCP connection for the
6563  * fore and backchannel.
6564  */
6565 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6566 {
6567         int status;
6568         struct nfs41_bind_conn_to_session_res res;
6569         struct rpc_message msg = {
6570                 .rpc_proc =
6571                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6572                 .rpc_argp = clp,
6573                 .rpc_resp = &res,
6574                 .rpc_cred = cred,
6575         };
6576
6577         dprintk("--> %s\n", __func__);
6578
6579         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6580         if (unlikely(res.session == NULL)) {
6581                 status = -ENOMEM;
6582                 goto out;
6583         }
6584
6585         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6586         trace_nfs4_bind_conn_to_session(clp, status);
6587         if (status == 0) {
6588                 if (memcmp(res.session->sess_id.data,
6589                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6590                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6591                         status = -EIO;
6592                         goto out_session;
6593                 }
6594                 if (res.dir != NFS4_CDFS4_BOTH) {
6595                         dprintk("NFS: %s: Unexpected direction from server\n",
6596                                 __func__);
6597                         status = -EIO;
6598                         goto out_session;
6599                 }
6600                 if (res.use_conn_in_rdma_mode) {
6601                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6602                                 __func__);
6603                         status = -EIO;
6604                         goto out_session;
6605                 }
6606         }
6607 out_session:
6608         kfree(res.session);
6609 out:
6610         dprintk("<-- %s status= %d\n", __func__, status);
6611         return status;
6612 }
6613
6614 /*
6615  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6616  * and operations we'd like to see to enable certain features in the allow map
6617  */
6618 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6619         .how = SP4_MACH_CRED,
6620         .enforce.u.words = {
6621                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6622                       1 << (OP_EXCHANGE_ID - 32) |
6623                       1 << (OP_CREATE_SESSION - 32) |
6624                       1 << (OP_DESTROY_SESSION - 32) |
6625                       1 << (OP_DESTROY_CLIENTID - 32)
6626         },
6627         .allow.u.words = {
6628                 [0] = 1 << (OP_CLOSE) |
6629                       1 << (OP_LOCKU) |
6630                       1 << (OP_COMMIT),
6631                 [1] = 1 << (OP_SECINFO - 32) |
6632                       1 << (OP_SECINFO_NO_NAME - 32) |
6633                       1 << (OP_TEST_STATEID - 32) |
6634                       1 << (OP_FREE_STATEID - 32) |
6635                       1 << (OP_WRITE - 32)
6636         }
6637 };
6638
6639 /*
6640  * Select the state protection mode for client `clp' given the server results
6641  * from exchange_id in `sp'.
6642  *
6643  * Returns 0 on success, negative errno otherwise.
6644  */
6645 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6646                                  struct nfs41_state_protection *sp)
6647 {
6648         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6649                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6650                       1 << (OP_EXCHANGE_ID - 32) |
6651                       1 << (OP_CREATE_SESSION - 32) |
6652                       1 << (OP_DESTROY_SESSION - 32) |
6653                       1 << (OP_DESTROY_CLIENTID - 32)
6654         };
6655         unsigned int i;
6656
6657         if (sp->how == SP4_MACH_CRED) {
6658                 /* Print state protect result */
6659                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6660                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6661                         if (test_bit(i, sp->enforce.u.longs))
6662                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6663                         if (test_bit(i, sp->allow.u.longs))
6664                                 dfprintk(MOUNT, "  allow op %d\n", i);
6665                 }
6666
6667                 /* make sure nothing is on enforce list that isn't supported */
6668                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6669                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6670                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6671                                 return -EINVAL;
6672                         }
6673                 }
6674
6675                 /*
6676                  * Minimal mode - state operations are allowed to use machine
6677                  * credential.  Note this already happens by default, so the
6678                  * client doesn't have to do anything more than the negotiation.
6679                  *
6680                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6681                  *       we're already using the machine cred for exchange_id
6682                  *       and will never use a different cred.
6683                  */
6684                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6685                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6686                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6687                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6688                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6689                         dfprintk(MOUNT, "  minimal mode enabled\n");
6690                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6691                 } else {
6692                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6693                         return -EINVAL;
6694                 }
6695
6696                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6697                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6698                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6699                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6700                 }
6701
6702                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6703                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6704                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6705                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6706                 }
6707
6708                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6709                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6710                         dfprintk(MOUNT, "  stateid mode enabled\n");
6711                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6712                 }
6713
6714                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6715                         dfprintk(MOUNT, "  write mode enabled\n");
6716                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6717                 }
6718
6719                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6720                         dfprintk(MOUNT, "  commit mode enabled\n");
6721                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6722                 }
6723         }
6724
6725         return 0;
6726 }
6727
6728 /*
6729  * _nfs4_proc_exchange_id()
6730  *
6731  * Wrapper for EXCHANGE_ID operation.
6732  */
6733 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6734         u32 sp4_how)
6735 {
6736         nfs4_verifier verifier;
6737         struct nfs41_exchange_id_args args = {
6738                 .verifier = &verifier,
6739                 .client = clp,
6740 #ifdef CONFIG_NFS_V4_1_MIGRATION
6741                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6742                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6743                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6744 #else
6745                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6746                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6747 #endif
6748         };
6749         struct nfs41_exchange_id_res res = {
6750                 0
6751         };
6752         int status;
6753         struct rpc_message msg = {
6754                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6755                 .rpc_argp = &args,
6756                 .rpc_resp = &res,
6757                 .rpc_cred = cred,
6758         };
6759
6760         nfs4_init_boot_verifier(clp, &verifier);
6761         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6762                                                         sizeof(args.id));
6763         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6764                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6765                 args.id_len, args.id);
6766
6767         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6768                                         GFP_NOFS);
6769         if (unlikely(res.server_owner == NULL)) {
6770                 status = -ENOMEM;
6771                 goto out;
6772         }
6773
6774         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6775                                         GFP_NOFS);
6776         if (unlikely(res.server_scope == NULL)) {
6777                 status = -ENOMEM;
6778                 goto out_server_owner;
6779         }
6780
6781         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6782         if (unlikely(res.impl_id == NULL)) {
6783                 status = -ENOMEM;
6784                 goto out_server_scope;
6785         }
6786
6787         switch (sp4_how) {
6788         case SP4_NONE:
6789                 args.state_protect.how = SP4_NONE;
6790                 break;
6791
6792         case SP4_MACH_CRED:
6793                 args.state_protect = nfs4_sp4_mach_cred_request;
6794                 break;
6795
6796         default:
6797                 /* unsupported! */
6798                 WARN_ON_ONCE(1);
6799                 status = -EINVAL;
6800                 goto out_server_scope;
6801         }
6802
6803         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6804         trace_nfs4_exchange_id(clp, status);
6805         if (status == 0)
6806                 status = nfs4_check_cl_exchange_flags(res.flags);
6807
6808         if (status == 0)
6809                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6810
6811         if (status == 0) {
6812                 clp->cl_clientid = res.clientid;
6813                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6814                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6815                         clp->cl_seqid = res.seqid;
6816
6817                 kfree(clp->cl_serverowner);
6818                 clp->cl_serverowner = res.server_owner;
6819                 res.server_owner = NULL;
6820
6821                 /* use the most recent implementation id */
6822                 kfree(clp->cl_implid);
6823                 clp->cl_implid = res.impl_id;
6824
6825                 if (clp->cl_serverscope != NULL &&
6826                     !nfs41_same_server_scope(clp->cl_serverscope,
6827                                              res.server_scope)) {
6828                         dprintk("%s: server_scope mismatch detected\n",
6829                                 __func__);
6830                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6831                         kfree(clp->cl_serverscope);
6832                         clp->cl_serverscope = NULL;
6833                 }
6834
6835                 if (clp->cl_serverscope == NULL) {
6836                         clp->cl_serverscope = res.server_scope;
6837                         goto out;
6838                 }
6839         } else
6840                 kfree(res.impl_id);
6841
6842 out_server_owner:
6843         kfree(res.server_owner);
6844 out_server_scope:
6845         kfree(res.server_scope);
6846 out:
6847         if (clp->cl_implid != NULL)
6848                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6849                         "domain: %s, name: %s, date: %llu,%u\n",
6850                         clp->cl_implid->domain, clp->cl_implid->name,
6851                         clp->cl_implid->date.seconds,
6852                         clp->cl_implid->date.nseconds);
6853         dprintk("NFS reply exchange_id: %d\n", status);
6854         return status;
6855 }
6856
6857 /*
6858  * nfs4_proc_exchange_id()
6859  *
6860  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6861  *
6862  * Since the clientid has expired, all compounds using sessions
6863  * associated with the stale clientid will be returning
6864  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6865  * be in some phase of session reset.
6866  *
6867  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6868  */
6869 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6870 {
6871         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6872         int status;
6873
6874         /* try SP4_MACH_CRED if krb5i/p */
6875         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6876             authflavor == RPC_AUTH_GSS_KRB5P) {
6877                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6878                 if (!status)
6879                         return 0;
6880         }
6881
6882         /* try SP4_NONE */
6883         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6884 }
6885
6886 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6887                 struct rpc_cred *cred)
6888 {
6889         struct rpc_message msg = {
6890                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6891                 .rpc_argp = clp,
6892                 .rpc_cred = cred,
6893         };
6894         int status;
6895
6896         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6897         trace_nfs4_destroy_clientid(clp, status);
6898         if (status)
6899                 dprintk("NFS: Got error %d from the server %s on "
6900                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6901         return status;
6902 }
6903
6904 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6905                 struct rpc_cred *cred)
6906 {
6907         unsigned int loop;
6908         int ret;
6909
6910         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6911                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6912                 switch (ret) {
6913                 case -NFS4ERR_DELAY:
6914                 case -NFS4ERR_CLIENTID_BUSY:
6915                         ssleep(1);
6916                         break;
6917                 default:
6918                         return ret;
6919                 }
6920         }
6921         return 0;
6922 }
6923
6924 int nfs4_destroy_clientid(struct nfs_client *clp)
6925 {
6926         struct rpc_cred *cred;
6927         int ret = 0;
6928
6929         if (clp->cl_mvops->minor_version < 1)
6930                 goto out;
6931         if (clp->cl_exchange_flags == 0)
6932                 goto out;
6933         if (clp->cl_preserve_clid)
6934                 goto out;
6935         cred = nfs4_get_clid_cred(clp);
6936         ret = nfs4_proc_destroy_clientid(clp, cred);
6937         if (cred)
6938                 put_rpccred(cred);
6939         switch (ret) {
6940         case 0:
6941         case -NFS4ERR_STALE_CLIENTID:
6942                 clp->cl_exchange_flags = 0;
6943         }
6944 out:
6945         return ret;
6946 }
6947
6948 struct nfs4_get_lease_time_data {
6949         struct nfs4_get_lease_time_args *args;
6950         struct nfs4_get_lease_time_res *res;
6951         struct nfs_client *clp;
6952 };
6953
6954 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6955                                         void *calldata)
6956 {
6957         struct nfs4_get_lease_time_data *data =
6958                         (struct nfs4_get_lease_time_data *)calldata;
6959
6960         dprintk("--> %s\n", __func__);
6961         /* just setup sequence, do not trigger session recovery
6962            since we're invoked within one */
6963         nfs41_setup_sequence(data->clp->cl_session,
6964                         &data->args->la_seq_args,
6965                         &data->res->lr_seq_res,
6966                         task);
6967         dprintk("<-- %s\n", __func__);
6968 }
6969
6970 /*
6971  * Called from nfs4_state_manager thread for session setup, so don't recover
6972  * from sequence operation or clientid errors.
6973  */
6974 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6975 {
6976         struct nfs4_get_lease_time_data *data =
6977                         (struct nfs4_get_lease_time_data *)calldata;
6978
6979         dprintk("--> %s\n", __func__);
6980         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6981                 return;
6982         switch (task->tk_status) {
6983         case -NFS4ERR_DELAY:
6984         case -NFS4ERR_GRACE:
6985                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6986                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6987                 task->tk_status = 0;
6988                 /* fall through */
6989         case -NFS4ERR_RETRY_UNCACHED_REP:
6990                 rpc_restart_call_prepare(task);
6991                 return;
6992         }
6993         dprintk("<-- %s\n", __func__);
6994 }
6995
6996 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6997         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6998         .rpc_call_done = nfs4_get_lease_time_done,
6999 };
7000
7001 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7002 {
7003         struct rpc_task *task;
7004         struct nfs4_get_lease_time_args args;
7005         struct nfs4_get_lease_time_res res = {
7006                 .lr_fsinfo = fsinfo,
7007         };
7008         struct nfs4_get_lease_time_data data = {
7009                 .args = &args,
7010                 .res = &res,
7011                 .clp = clp,
7012         };
7013         struct rpc_message msg = {
7014                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7015                 .rpc_argp = &args,
7016                 .rpc_resp = &res,
7017         };
7018         struct rpc_task_setup task_setup = {
7019                 .rpc_client = clp->cl_rpcclient,
7020                 .rpc_message = &msg,
7021                 .callback_ops = &nfs4_get_lease_time_ops,
7022                 .callback_data = &data,
7023                 .flags = RPC_TASK_TIMEOUT,
7024         };
7025         int status;
7026
7027         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7028         nfs4_set_sequence_privileged(&args.la_seq_args);
7029         dprintk("--> %s\n", __func__);
7030         task = rpc_run_task(&task_setup);
7031
7032         if (IS_ERR(task))
7033                 status = PTR_ERR(task);
7034         else {
7035                 status = task->tk_status;
7036                 rpc_put_task(task);
7037         }
7038         dprintk("<-- %s return %d\n", __func__, status);
7039
7040         return status;
7041 }
7042
7043 /*
7044  * Initialize the values to be used by the client in CREATE_SESSION
7045  * If nfs4_init_session set the fore channel request and response sizes,
7046  * use them.
7047  *
7048  * Set the back channel max_resp_sz_cached to zero to force the client to
7049  * always set csa_cachethis to FALSE because the current implementation
7050  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7051  */
7052 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7053 {
7054         unsigned int max_rqst_sz, max_resp_sz;
7055
7056         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7057         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7058
7059         /* Fore channel attributes */
7060         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7061         args->fc_attrs.max_resp_sz = max_resp_sz;
7062         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7063         args->fc_attrs.max_reqs = max_session_slots;
7064
7065         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7066                 "max_ops=%u max_reqs=%u\n",
7067                 __func__,
7068                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7069                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7070
7071         /* Back channel attributes */
7072         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7073         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7074         args->bc_attrs.max_resp_sz_cached = 0;
7075         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7076         args->bc_attrs.max_reqs = 1;
7077
7078         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7079                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7080                 __func__,
7081                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7082                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7083                 args->bc_attrs.max_reqs);
7084 }
7085
7086 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7087 {
7088         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7089         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7090
7091         if (rcvd->max_resp_sz > sent->max_resp_sz)
7092                 return -EINVAL;
7093         /*
7094          * Our requested max_ops is the minimum we need; we're not
7095          * prepared to break up compounds into smaller pieces than that.
7096          * So, no point even trying to continue if the server won't
7097          * cooperate:
7098          */
7099         if (rcvd->max_ops < sent->max_ops)
7100                 return -EINVAL;
7101         if (rcvd->max_reqs == 0)
7102                 return -EINVAL;
7103         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7104                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7105         return 0;
7106 }
7107
7108 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7109 {
7110         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7111         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7112
7113         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7114                 return -EINVAL;
7115         if (rcvd->max_resp_sz < sent->max_resp_sz)
7116                 return -EINVAL;
7117         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7118                 return -EINVAL;
7119         /* These would render the backchannel useless: */
7120         if (rcvd->max_ops != sent->max_ops)
7121                 return -EINVAL;
7122         if (rcvd->max_reqs != sent->max_reqs)
7123                 return -EINVAL;
7124         return 0;
7125 }
7126
7127 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7128                                      struct nfs4_session *session)
7129 {
7130         int ret;
7131
7132         ret = nfs4_verify_fore_channel_attrs(args, session);
7133         if (ret)
7134                 return ret;
7135         return nfs4_verify_back_channel_attrs(args, session);
7136 }
7137
7138 static int _nfs4_proc_create_session(struct nfs_client *clp,
7139                 struct rpc_cred *cred)
7140 {
7141         struct nfs4_session *session = clp->cl_session;
7142         struct nfs41_create_session_args args = {
7143                 .client = clp,
7144                 .cb_program = NFS4_CALLBACK,
7145         };
7146         struct nfs41_create_session_res res = {
7147                 .client = clp,
7148         };
7149         struct rpc_message msg = {
7150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7151                 .rpc_argp = &args,
7152                 .rpc_resp = &res,
7153                 .rpc_cred = cred,
7154         };
7155         int status;
7156
7157         nfs4_init_channel_attrs(&args);
7158         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7159
7160         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7161         trace_nfs4_create_session(clp, status);
7162
7163         if (!status) {
7164                 /* Verify the session's negotiated channel_attrs values */
7165                 status = nfs4_verify_channel_attrs(&args, session);
7166                 /* Increment the clientid slot sequence id */
7167                 clp->cl_seqid++;
7168         }
7169
7170         return status;
7171 }
7172
7173 /*
7174  * Issues a CREATE_SESSION operation to the server.
7175  * It is the responsibility of the caller to verify the session is
7176  * expired before calling this routine.
7177  */
7178 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7179 {
7180         int status;
7181         unsigned *ptr;
7182         struct nfs4_session *session = clp->cl_session;
7183
7184         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7185
7186         status = _nfs4_proc_create_session(clp, cred);
7187         if (status)
7188                 goto out;
7189
7190         /* Init or reset the session slot tables */
7191         status = nfs4_setup_session_slot_tables(session);
7192         dprintk("slot table setup returned %d\n", status);
7193         if (status)
7194                 goto out;
7195
7196         ptr = (unsigned *)&session->sess_id.data[0];
7197         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7198                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7199 out:
7200         dprintk("<-- %s\n", __func__);
7201         return status;
7202 }
7203
7204 /*
7205  * Issue the over-the-wire RPC DESTROY_SESSION.
7206  * The caller must serialize access to this routine.
7207  */
7208 int nfs4_proc_destroy_session(struct nfs4_session *session,
7209                 struct rpc_cred *cred)
7210 {
7211         struct rpc_message msg = {
7212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7213                 .rpc_argp = session,
7214                 .rpc_cred = cred,
7215         };
7216         int status = 0;
7217
7218         dprintk("--> nfs4_proc_destroy_session\n");
7219
7220         /* session is still being setup */
7221         if (session->clp->cl_cons_state != NFS_CS_READY)
7222                 return status;
7223
7224         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7225         trace_nfs4_destroy_session(session->clp, status);
7226
7227         if (status)
7228                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7229                         "Session has been destroyed regardless...\n", status);
7230
7231         dprintk("<-- nfs4_proc_destroy_session\n");
7232         return status;
7233 }
7234
7235 /*
7236  * Renew the cl_session lease.
7237  */
7238 struct nfs4_sequence_data {
7239         struct nfs_client *clp;
7240         struct nfs4_sequence_args args;
7241         struct nfs4_sequence_res res;
7242 };
7243
7244 static void nfs41_sequence_release(void *data)
7245 {
7246         struct nfs4_sequence_data *calldata = data;
7247         struct nfs_client *clp = calldata->clp;
7248
7249         if (atomic_read(&clp->cl_count) > 1)
7250                 nfs4_schedule_state_renewal(clp);
7251         nfs_put_client(clp);
7252         kfree(calldata);
7253 }
7254
7255 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7256 {
7257         switch(task->tk_status) {
7258         case -NFS4ERR_DELAY:
7259                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7260                 return -EAGAIN;
7261         default:
7262                 nfs4_schedule_lease_recovery(clp);
7263         }
7264         return 0;
7265 }
7266
7267 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7268 {
7269         struct nfs4_sequence_data *calldata = data;
7270         struct nfs_client *clp = calldata->clp;
7271
7272         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7273                 return;
7274
7275         trace_nfs4_sequence(clp, task->tk_status);
7276         if (task->tk_status < 0) {
7277                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7278                 if (atomic_read(&clp->cl_count) == 1)
7279                         goto out;
7280
7281                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7282                         rpc_restart_call_prepare(task);
7283                         return;
7284                 }
7285         }
7286         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7287 out:
7288         dprintk("<-- %s\n", __func__);
7289 }
7290
7291 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7292 {
7293         struct nfs4_sequence_data *calldata = data;
7294         struct nfs_client *clp = calldata->clp;
7295         struct nfs4_sequence_args *args;
7296         struct nfs4_sequence_res *res;
7297
7298         args = task->tk_msg.rpc_argp;
7299         res = task->tk_msg.rpc_resp;
7300
7301         nfs41_setup_sequence(clp->cl_session, args, res, task);
7302 }
7303
7304 static const struct rpc_call_ops nfs41_sequence_ops = {
7305         .rpc_call_done = nfs41_sequence_call_done,
7306         .rpc_call_prepare = nfs41_sequence_prepare,
7307         .rpc_release = nfs41_sequence_release,
7308 };
7309
7310 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7311                 struct rpc_cred *cred,
7312                 bool is_privileged)
7313 {
7314         struct nfs4_sequence_data *calldata;
7315         struct rpc_message msg = {
7316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7317                 .rpc_cred = cred,
7318         };
7319         struct rpc_task_setup task_setup_data = {
7320                 .rpc_client = clp->cl_rpcclient,
7321                 .rpc_message = &msg,
7322                 .callback_ops = &nfs41_sequence_ops,
7323                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7324         };
7325
7326         if (!atomic_inc_not_zero(&clp->cl_count))
7327                 return ERR_PTR(-EIO);
7328         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7329         if (calldata == NULL) {
7330                 nfs_put_client(clp);
7331                 return ERR_PTR(-ENOMEM);
7332         }
7333         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7334         if (is_privileged)
7335                 nfs4_set_sequence_privileged(&calldata->args);
7336         msg.rpc_argp = &calldata->args;
7337         msg.rpc_resp = &calldata->res;
7338         calldata->clp = clp;
7339         task_setup_data.callback_data = calldata;
7340
7341         return rpc_run_task(&task_setup_data);
7342 }
7343
7344 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7345 {
7346         struct rpc_task *task;
7347         int ret = 0;
7348
7349         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7350                 return 0;
7351         task = _nfs41_proc_sequence(clp, cred, false);
7352         if (IS_ERR(task))
7353                 ret = PTR_ERR(task);
7354         else
7355                 rpc_put_task_async(task);
7356         dprintk("<-- %s status=%d\n", __func__, ret);
7357         return ret;
7358 }
7359
7360 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7361 {
7362         struct rpc_task *task;
7363         int ret;
7364
7365         task = _nfs41_proc_sequence(clp, cred, true);
7366         if (IS_ERR(task)) {
7367                 ret = PTR_ERR(task);
7368                 goto out;
7369         }
7370         ret = rpc_wait_for_completion_task(task);
7371         if (!ret) {
7372                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7373
7374                 if (task->tk_status == 0)
7375                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7376                 ret = task->tk_status;
7377         }
7378         rpc_put_task(task);
7379 out:
7380         dprintk("<-- %s status=%d\n", __func__, ret);
7381         return ret;
7382 }
7383
7384 struct nfs4_reclaim_complete_data {
7385         struct nfs_client *clp;
7386         struct nfs41_reclaim_complete_args arg;
7387         struct nfs41_reclaim_complete_res res;
7388 };
7389
7390 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7391 {
7392         struct nfs4_reclaim_complete_data *calldata = data;
7393
7394         nfs41_setup_sequence(calldata->clp->cl_session,
7395                         &calldata->arg.seq_args,
7396                         &calldata->res.seq_res,
7397                         task);
7398 }
7399
7400 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7401 {
7402         switch(task->tk_status) {
7403         case 0:
7404         case -NFS4ERR_COMPLETE_ALREADY:
7405         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7406                 break;
7407         case -NFS4ERR_DELAY:
7408                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7409                 /* fall through */
7410         case -NFS4ERR_RETRY_UNCACHED_REP:
7411                 return -EAGAIN;
7412         default:
7413                 nfs4_schedule_lease_recovery(clp);
7414         }
7415         return 0;
7416 }
7417
7418 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7419 {
7420         struct nfs4_reclaim_complete_data *calldata = data;
7421         struct nfs_client *clp = calldata->clp;
7422         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7423
7424         dprintk("--> %s\n", __func__);
7425         if (!nfs41_sequence_done(task, res))
7426                 return;
7427
7428         trace_nfs4_reclaim_complete(clp, task->tk_status);
7429         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7430                 rpc_restart_call_prepare(task);
7431                 return;
7432         }
7433         dprintk("<-- %s\n", __func__);
7434 }
7435
7436 static void nfs4_free_reclaim_complete_data(void *data)
7437 {
7438         struct nfs4_reclaim_complete_data *calldata = data;
7439
7440         kfree(calldata);
7441 }
7442
7443 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7444         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7445         .rpc_call_done = nfs4_reclaim_complete_done,
7446         .rpc_release = nfs4_free_reclaim_complete_data,
7447 };
7448
7449 /*
7450  * Issue a global reclaim complete.
7451  */
7452 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7453                 struct rpc_cred *cred)
7454 {
7455         struct nfs4_reclaim_complete_data *calldata;
7456         struct rpc_task *task;
7457         struct rpc_message msg = {
7458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7459                 .rpc_cred = cred,
7460         };
7461         struct rpc_task_setup task_setup_data = {
7462                 .rpc_client = clp->cl_rpcclient,
7463                 .rpc_message = &msg,
7464                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7465                 .flags = RPC_TASK_ASYNC,
7466         };
7467         int status = -ENOMEM;
7468
7469         dprintk("--> %s\n", __func__);
7470         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7471         if (calldata == NULL)
7472                 goto out;
7473         calldata->clp = clp;
7474         calldata->arg.one_fs = 0;
7475
7476         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7477         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7478         msg.rpc_argp = &calldata->arg;
7479         msg.rpc_resp = &calldata->res;
7480         task_setup_data.callback_data = calldata;
7481         task = rpc_run_task(&task_setup_data);
7482         if (IS_ERR(task)) {
7483                 status = PTR_ERR(task);
7484                 goto out;
7485         }
7486         status = nfs4_wait_for_completion_rpc_task(task);
7487         if (status == 0)
7488                 status = task->tk_status;
7489         rpc_put_task(task);
7490         return 0;
7491 out:
7492         dprintk("<-- %s status=%d\n", __func__, status);
7493         return status;
7494 }
7495
7496 static void
7497 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7498 {
7499         struct nfs4_layoutget *lgp = calldata;
7500         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7501         struct nfs4_session *session = nfs4_get_session(server);
7502
7503         dprintk("--> %s\n", __func__);
7504         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7505          * right now covering the LAYOUTGET we are about to send.
7506          * However, that is not so catastrophic, and there seems
7507          * to be no way to prevent it completely.
7508          */
7509         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7510                                 &lgp->res.seq_res, task))
7511                 return;
7512         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7513                                           NFS_I(lgp->args.inode)->layout,
7514                                           lgp->args.ctx->state)) {
7515                 rpc_exit(task, NFS4_OK);
7516         }
7517 }
7518
7519 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7520 {
7521         struct nfs4_layoutget *lgp = calldata;
7522         struct inode *inode = lgp->args.inode;
7523         struct nfs_server *server = NFS_SERVER(inode);
7524         struct pnfs_layout_hdr *lo;
7525         struct nfs4_state *state = NULL;
7526         unsigned long timeo, now, giveup;
7527
7528         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7529
7530         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7531                 goto out;
7532
7533         switch (task->tk_status) {
7534         case 0:
7535                 goto out;
7536         /*
7537          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7538          * (or clients) writing to the same RAID stripe
7539          */
7540         case -NFS4ERR_LAYOUTTRYLATER:
7541         /*
7542          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7543          * existing layout before getting a new one).
7544          */
7545         case -NFS4ERR_RECALLCONFLICT:
7546                 timeo = rpc_get_timeout(task->tk_client);
7547                 giveup = lgp->args.timestamp + timeo;
7548                 now = jiffies;
7549                 if (time_after(giveup, now)) {
7550                         unsigned long delay;
7551
7552                         /* Delay for:
7553                          * - Not less then NFS4_POLL_RETRY_MIN.
7554                          * - One last time a jiffie before we give up
7555                          * - exponential backoff (time_now minus start_attempt)
7556                          */
7557                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7558                                     min((giveup - now - 1),
7559                                         now - lgp->args.timestamp));
7560
7561                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7562                                 __func__, delay);
7563                         rpc_delay(task, delay);
7564                         task->tk_status = 0;
7565                         rpc_restart_call_prepare(task);
7566                         goto out; /* Do not call nfs4_async_handle_error() */
7567                 }
7568                 break;
7569         case -NFS4ERR_EXPIRED:
7570         case -NFS4ERR_BAD_STATEID:
7571                 spin_lock(&inode->i_lock);
7572                 lo = NFS_I(inode)->layout;
7573                 if (!lo || list_empty(&lo->plh_segs)) {
7574                         spin_unlock(&inode->i_lock);
7575                         /* If the open stateid was bad, then recover it. */
7576                         state = lgp->args.ctx->state;
7577                 } else {
7578                         LIST_HEAD(head);
7579
7580                         /*
7581                          * Mark the bad layout state as invalid, then retry
7582                          * with the current stateid.
7583                          */
7584                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7585                         spin_unlock(&inode->i_lock);
7586                         pnfs_free_lseg_list(&head);
7587
7588                         task->tk_status = 0;
7589                         rpc_restart_call_prepare(task);
7590                 }
7591         }
7592         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7593                 rpc_restart_call_prepare(task);
7594 out:
7595         dprintk("<-- %s\n", __func__);
7596 }
7597
7598 static size_t max_response_pages(struct nfs_server *server)
7599 {
7600         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7601         return nfs_page_array_len(0, max_resp_sz);
7602 }
7603
7604 static void nfs4_free_pages(struct page **pages, size_t size)
7605 {
7606         int i;
7607
7608         if (!pages)
7609                 return;
7610
7611         for (i = 0; i < size; i++) {
7612                 if (!pages[i])
7613                         break;
7614                 __free_page(pages[i]);
7615         }
7616         kfree(pages);
7617 }
7618
7619 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7620 {
7621         struct page **pages;
7622         int i;
7623
7624         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7625         if (!pages) {
7626                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7627                 return NULL;
7628         }
7629
7630         for (i = 0; i < size; i++) {
7631                 pages[i] = alloc_page(gfp_flags);
7632                 if (!pages[i]) {
7633                         dprintk("%s: failed to allocate page\n", __func__);
7634                         nfs4_free_pages(pages, size);
7635                         return NULL;
7636                 }
7637         }
7638
7639         return pages;
7640 }
7641
7642 static void nfs4_layoutget_release(void *calldata)
7643 {
7644         struct nfs4_layoutget *lgp = calldata;
7645         struct inode *inode = lgp->args.inode;
7646         struct nfs_server *server = NFS_SERVER(inode);
7647         size_t max_pages = max_response_pages(server);
7648
7649         dprintk("--> %s\n", __func__);
7650         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7651         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7652         put_nfs_open_context(lgp->args.ctx);
7653         kfree(calldata);
7654         dprintk("<-- %s\n", __func__);
7655 }
7656
7657 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7658         .rpc_call_prepare = nfs4_layoutget_prepare,
7659         .rpc_call_done = nfs4_layoutget_done,
7660         .rpc_release = nfs4_layoutget_release,
7661 };
7662
7663 struct pnfs_layout_segment *
7664 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7665 {
7666         struct inode *inode = lgp->args.inode;
7667         struct nfs_server *server = NFS_SERVER(inode);
7668         size_t max_pages = max_response_pages(server);
7669         struct rpc_task *task;
7670         struct rpc_message msg = {
7671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7672                 .rpc_argp = &lgp->args,
7673                 .rpc_resp = &lgp->res,
7674                 .rpc_cred = lgp->cred,
7675         };
7676         struct rpc_task_setup task_setup_data = {
7677                 .rpc_client = server->client,
7678                 .rpc_message = &msg,
7679                 .callback_ops = &nfs4_layoutget_call_ops,
7680                 .callback_data = lgp,
7681                 .flags = RPC_TASK_ASYNC,
7682         };
7683         struct pnfs_layout_segment *lseg = NULL;
7684         int status = 0;
7685
7686         dprintk("--> %s\n", __func__);
7687
7688         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7689         if (!lgp->args.layout.pages) {
7690                 nfs4_layoutget_release(lgp);
7691                 return ERR_PTR(-ENOMEM);
7692         }
7693         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7694         lgp->args.timestamp = jiffies;
7695
7696         lgp->res.layoutp = &lgp->args.layout;
7697         lgp->res.seq_res.sr_slot = NULL;
7698         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7699
7700         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7701         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7702
7703         task = rpc_run_task(&task_setup_data);
7704         if (IS_ERR(task))
7705                 return ERR_CAST(task);
7706         status = nfs4_wait_for_completion_rpc_task(task);
7707         if (status == 0)
7708                 status = task->tk_status;
7709         trace_nfs4_layoutget(lgp->args.ctx,
7710                         &lgp->args.range,
7711                         &lgp->res.range,
7712                         status);
7713         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7714         if (status == 0 && lgp->res.layoutp->len)
7715                 lseg = pnfs_layout_process(lgp);
7716         rpc_put_task(task);
7717         dprintk("<-- %s status=%d\n", __func__, status);
7718         if (status)
7719                 return ERR_PTR(status);
7720         return lseg;
7721 }
7722
7723 static void
7724 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7725 {
7726         struct nfs4_layoutreturn *lrp = calldata;
7727
7728         dprintk("--> %s\n", __func__);
7729         nfs41_setup_sequence(lrp->clp->cl_session,
7730                         &lrp->args.seq_args,
7731                         &lrp->res.seq_res,
7732                         task);
7733 }
7734
7735 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7736 {
7737         struct nfs4_layoutreturn *lrp = calldata;
7738         struct nfs_server *server;
7739
7740         dprintk("--> %s\n", __func__);
7741
7742         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7743                 return;
7744
7745         server = NFS_SERVER(lrp->args.inode);
7746         switch (task->tk_status) {
7747         default:
7748                 task->tk_status = 0;
7749         case 0:
7750                 break;
7751         case -NFS4ERR_DELAY:
7752                 if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN)
7753                         break;
7754                 rpc_restart_call_prepare(task);
7755                 return;
7756         }
7757         dprintk("<-- %s\n", __func__);
7758 }
7759
7760 static void nfs4_layoutreturn_release(void *calldata)
7761 {
7762         struct nfs4_layoutreturn *lrp = calldata;
7763         struct pnfs_layout_hdr *lo = lrp->args.layout;
7764
7765         dprintk("--> %s\n", __func__);
7766         spin_lock(&lo->plh_inode->i_lock);
7767         if (lrp->res.lrs_present)
7768                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7769         lo->plh_block_lgets--;
7770         spin_unlock(&lo->plh_inode->i_lock);
7771         pnfs_put_layout_hdr(lrp->args.layout);
7772         kfree(calldata);
7773         dprintk("<-- %s\n", __func__);
7774 }
7775
7776 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7777         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7778         .rpc_call_done = nfs4_layoutreturn_done,
7779         .rpc_release = nfs4_layoutreturn_release,
7780 };
7781
7782 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7783 {
7784         struct rpc_task *task;
7785         struct rpc_message msg = {
7786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7787                 .rpc_argp = &lrp->args,
7788                 .rpc_resp = &lrp->res,
7789                 .rpc_cred = lrp->cred,
7790         };
7791         struct rpc_task_setup task_setup_data = {
7792                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7793                 .rpc_message = &msg,
7794                 .callback_ops = &nfs4_layoutreturn_call_ops,
7795                 .callback_data = lrp,
7796         };
7797         int status;
7798
7799         dprintk("--> %s\n", __func__);
7800         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7801         task = rpc_run_task(&task_setup_data);
7802         if (IS_ERR(task))
7803                 return PTR_ERR(task);
7804         status = task->tk_status;
7805         trace_nfs4_layoutreturn(lrp->args.inode, status);
7806         dprintk("<-- %s status=%d\n", __func__, status);
7807         rpc_put_task(task);
7808         return status;
7809 }
7810
7811 static int
7812 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7813                 struct pnfs_device *pdev,
7814                 struct rpc_cred *cred)
7815 {
7816         struct nfs4_getdeviceinfo_args args = {
7817                 .pdev = pdev,
7818         };
7819         struct nfs4_getdeviceinfo_res res = {
7820                 .pdev = pdev,
7821         };
7822         struct rpc_message msg = {
7823                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7824                 .rpc_argp = &args,
7825                 .rpc_resp = &res,
7826                 .rpc_cred = cred,
7827         };
7828         int status;
7829
7830         dprintk("--> %s\n", __func__);
7831         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7832         dprintk("<-- %s status=%d\n", __func__, status);
7833
7834         return status;
7835 }
7836
7837 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7838                 struct pnfs_device *pdev,
7839                 struct rpc_cred *cred)
7840 {
7841         struct nfs4_exception exception = { };
7842         int err;
7843
7844         do {
7845                 err = nfs4_handle_exception(server,
7846                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7847                                         &exception);
7848         } while (exception.retry);
7849         return err;
7850 }
7851 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7852
7853 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7854 {
7855         struct nfs4_layoutcommit_data *data = calldata;
7856         struct nfs_server *server = NFS_SERVER(data->args.inode);
7857         struct nfs4_session *session = nfs4_get_session(server);
7858
7859         nfs41_setup_sequence(session,
7860                         &data->args.seq_args,
7861                         &data->res.seq_res,
7862                         task);
7863 }
7864
7865 static void
7866 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7867 {
7868         struct nfs4_layoutcommit_data *data = calldata;
7869         struct nfs_server *server = NFS_SERVER(data->args.inode);
7870
7871         if (!nfs41_sequence_done(task, &data->res.seq_res))
7872                 return;
7873
7874         switch (task->tk_status) { /* Just ignore these failures */
7875         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7876         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7877         case -NFS4ERR_BADLAYOUT:     /* no layout */
7878         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7879                 task->tk_status = 0;
7880         case 0:
7881                 break;
7882         default:
7883                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7884                         rpc_restart_call_prepare(task);
7885                         return;
7886                 }
7887         }
7888 }
7889
7890 static void nfs4_layoutcommit_release(void *calldata)
7891 {
7892         struct nfs4_layoutcommit_data *data = calldata;
7893
7894         pnfs_cleanup_layoutcommit(data);
7895         nfs_post_op_update_inode_force_wcc(data->args.inode,
7896                                            data->res.fattr);
7897         put_rpccred(data->cred);
7898         kfree(data);
7899 }
7900
7901 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7902         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7903         .rpc_call_done = nfs4_layoutcommit_done,
7904         .rpc_release = nfs4_layoutcommit_release,
7905 };
7906
7907 int
7908 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7909 {
7910         struct rpc_message msg = {
7911                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7912                 .rpc_argp = &data->args,
7913                 .rpc_resp = &data->res,
7914                 .rpc_cred = data->cred,
7915         };
7916         struct rpc_task_setup task_setup_data = {
7917                 .task = &data->task,
7918                 .rpc_client = NFS_CLIENT(data->args.inode),
7919                 .rpc_message = &msg,
7920                 .callback_ops = &nfs4_layoutcommit_ops,
7921                 .callback_data = data,
7922                 .flags = RPC_TASK_ASYNC,
7923         };
7924         struct rpc_task *task;
7925         int status = 0;
7926
7927         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7928                 "lbw: %llu inode %lu\n",
7929                 data->task.tk_pid, sync,
7930                 data->args.lastbytewritten,
7931                 data->args.inode->i_ino);
7932
7933         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7934         task = rpc_run_task(&task_setup_data);
7935         if (IS_ERR(task))
7936                 return PTR_ERR(task);
7937         if (sync == false)
7938                 goto out;
7939         status = nfs4_wait_for_completion_rpc_task(task);
7940         if (status != 0)
7941                 goto out;
7942         status = task->tk_status;
7943         trace_nfs4_layoutcommit(data->args.inode, status);
7944 out:
7945         dprintk("%s: status %d\n", __func__, status);
7946         rpc_put_task(task);
7947         return status;
7948 }
7949
7950 /**
7951  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7952  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7953  */
7954 static int
7955 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7956                     struct nfs_fsinfo *info,
7957                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7958 {
7959         struct nfs41_secinfo_no_name_args args = {
7960                 .style = SECINFO_STYLE_CURRENT_FH,
7961         };
7962         struct nfs4_secinfo_res res = {
7963                 .flavors = flavors,
7964         };
7965         struct rpc_message msg = {
7966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7967                 .rpc_argp = &args,
7968                 .rpc_resp = &res,
7969         };
7970         struct rpc_clnt *clnt = server->client;
7971         struct rpc_cred *cred = NULL;
7972         int status;
7973
7974         if (use_integrity) {
7975                 clnt = server->nfs_client->cl_rpcclient;
7976                 cred = nfs4_get_clid_cred(server->nfs_client);
7977                 msg.rpc_cred = cred;
7978         }
7979
7980         dprintk("--> %s\n", __func__);
7981         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7982                                 &res.seq_res, 0);
7983         dprintk("<-- %s status=%d\n", __func__, status);
7984
7985         if (cred)
7986                 put_rpccred(cred);
7987
7988         return status;
7989 }
7990
7991 static int
7992 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7993                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7994 {
7995         struct nfs4_exception exception = { };
7996         int err;
7997         do {
7998                 /* first try using integrity protection */
7999                 err = -NFS4ERR_WRONGSEC;
8000
8001                 /* try to use integrity protection with machine cred */
8002                 if (_nfs4_is_integrity_protected(server->nfs_client))
8003                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8004                                                           flavors, true);
8005
8006                 /*
8007                  * if unable to use integrity protection, or SECINFO with
8008                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8009                  * disallowed by spec, but exists in deployed servers) use
8010                  * the current filesystem's rpc_client and the user cred.
8011                  */
8012                 if (err == -NFS4ERR_WRONGSEC)
8013                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8014                                                           flavors, false);
8015
8016                 switch (err) {
8017                 case 0:
8018                 case -NFS4ERR_WRONGSEC:
8019                 case -ENOTSUPP:
8020                         goto out;
8021                 default:
8022                         err = nfs4_handle_exception(server, err, &exception);
8023                 }
8024         } while (exception.retry);
8025 out:
8026         return err;
8027 }
8028
8029 static int
8030 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8031                     struct nfs_fsinfo *info)
8032 {
8033         int err;
8034         struct page *page;
8035         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8036         struct nfs4_secinfo_flavors *flavors;
8037         struct nfs4_secinfo4 *secinfo;
8038         int i;
8039
8040         page = alloc_page(GFP_KERNEL);
8041         if (!page) {
8042                 err = -ENOMEM;
8043                 goto out;
8044         }
8045
8046         flavors = page_address(page);
8047         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8048
8049         /*
8050          * Fall back on "guess and check" method if
8051          * the server doesn't support SECINFO_NO_NAME
8052          */
8053         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8054                 err = nfs4_find_root_sec(server, fhandle, info);
8055                 goto out_freepage;
8056         }
8057         if (err)
8058                 goto out_freepage;
8059
8060         for (i = 0; i < flavors->num_flavors; i++) {
8061                 secinfo = &flavors->flavors[i];
8062
8063                 switch (secinfo->flavor) {
8064                 case RPC_AUTH_NULL:
8065                 case RPC_AUTH_UNIX:
8066                 case RPC_AUTH_GSS:
8067                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8068                                         &secinfo->flavor_info);
8069                         break;
8070                 default:
8071                         flavor = RPC_AUTH_MAXFLAVOR;
8072                         break;
8073                 }
8074
8075                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8076                         flavor = RPC_AUTH_MAXFLAVOR;
8077
8078                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8079                         err = nfs4_lookup_root_sec(server, fhandle,
8080                                                    info, flavor);
8081                         if (!err)
8082                                 break;
8083                 }
8084         }
8085
8086         if (flavor == RPC_AUTH_MAXFLAVOR)
8087                 err = -EPERM;
8088
8089 out_freepage:
8090         put_page(page);
8091         if (err == -EACCES)
8092                 return -EPERM;
8093 out:
8094         return err;
8095 }
8096
8097 static int _nfs41_test_stateid(struct nfs_server *server,
8098                 nfs4_stateid *stateid,
8099                 struct rpc_cred *cred)
8100 {
8101         int status;
8102         struct nfs41_test_stateid_args args = {
8103                 .stateid = stateid,
8104         };
8105         struct nfs41_test_stateid_res res;
8106         struct rpc_message msg = {
8107                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8108                 .rpc_argp = &args,
8109                 .rpc_resp = &res,
8110                 .rpc_cred = cred,
8111         };
8112         struct rpc_clnt *rpc_client = server->client;
8113
8114         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8115                 &rpc_client, &msg);
8116
8117         dprintk("NFS call  test_stateid %p\n", stateid);
8118         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8119         nfs4_set_sequence_privileged(&args.seq_args);
8120         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8121                         &args.seq_args, &res.seq_res);
8122         if (status != NFS_OK) {
8123                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8124                 return status;
8125         }
8126         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8127         return -res.status;
8128 }
8129
8130 /**
8131  * nfs41_test_stateid - perform a TEST_STATEID operation
8132  *
8133  * @server: server / transport on which to perform the operation
8134  * @stateid: state ID to test
8135  * @cred: credential
8136  *
8137  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8138  * Otherwise a negative NFS4ERR value is returned if the operation
8139  * failed or the state ID is not currently valid.
8140  */
8141 static int nfs41_test_stateid(struct nfs_server *server,
8142                 nfs4_stateid *stateid,
8143                 struct rpc_cred *cred)
8144 {
8145         struct nfs4_exception exception = { };
8146         int err;
8147         do {
8148                 err = _nfs41_test_stateid(server, stateid, cred);
8149                 if (err != -NFS4ERR_DELAY)
8150                         break;
8151                 nfs4_handle_exception(server, err, &exception);
8152         } while (exception.retry);
8153         return err;
8154 }
8155
8156 struct nfs_free_stateid_data {
8157         struct nfs_server *server;
8158         struct nfs41_free_stateid_args args;
8159         struct nfs41_free_stateid_res res;
8160 };
8161
8162 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8163 {
8164         struct nfs_free_stateid_data *data = calldata;
8165         nfs41_setup_sequence(nfs4_get_session(data->server),
8166                         &data->args.seq_args,
8167                         &data->res.seq_res,
8168                         task);
8169 }
8170
8171 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8172 {
8173         struct nfs_free_stateid_data *data = calldata;
8174
8175         nfs41_sequence_done(task, &data->res.seq_res);
8176
8177         switch (task->tk_status) {
8178         case -NFS4ERR_DELAY:
8179                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8180                         rpc_restart_call_prepare(task);
8181         }
8182 }
8183
8184 static void nfs41_free_stateid_release(void *calldata)
8185 {
8186         kfree(calldata);
8187 }
8188
8189 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8190         .rpc_call_prepare = nfs41_free_stateid_prepare,
8191         .rpc_call_done = nfs41_free_stateid_done,
8192         .rpc_release = nfs41_free_stateid_release,
8193 };
8194
8195 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8196                 nfs4_stateid *stateid,
8197                 struct rpc_cred *cred,
8198                 bool privileged)
8199 {
8200         struct rpc_message msg = {
8201                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8202                 .rpc_cred = cred,
8203         };
8204         struct rpc_task_setup task_setup = {
8205                 .rpc_client = server->client,
8206                 .rpc_message = &msg,
8207                 .callback_ops = &nfs41_free_stateid_ops,
8208                 .flags = RPC_TASK_ASYNC,
8209         };
8210         struct nfs_free_stateid_data *data;
8211
8212         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8213                 &task_setup.rpc_client, &msg);
8214
8215         dprintk("NFS call  free_stateid %p\n", stateid);
8216         data = kmalloc(sizeof(*data), GFP_NOFS);
8217         if (!data)
8218                 return ERR_PTR(-ENOMEM);
8219         data->server = server;
8220         nfs4_stateid_copy(&data->args.stateid, stateid);
8221
8222         task_setup.callback_data = data;
8223
8224         msg.rpc_argp = &data->args;
8225         msg.rpc_resp = &data->res;
8226         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8227         if (privileged)
8228                 nfs4_set_sequence_privileged(&data->args.seq_args);
8229
8230         return rpc_run_task(&task_setup);
8231 }
8232
8233 /**
8234  * nfs41_free_stateid - perform a FREE_STATEID operation
8235  *
8236  * @server: server / transport on which to perform the operation
8237  * @stateid: state ID to release
8238  * @cred: credential
8239  *
8240  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8241  * negative NFS4ERR value is returned.
8242  */
8243 static int nfs41_free_stateid(struct nfs_server *server,
8244                 nfs4_stateid *stateid,
8245                 struct rpc_cred *cred)
8246 {
8247         struct rpc_task *task;
8248         int ret;
8249
8250         task = _nfs41_free_stateid(server, stateid, cred, true);
8251         if (IS_ERR(task))
8252                 return PTR_ERR(task);
8253         ret = rpc_wait_for_completion_task(task);
8254         if (!ret)
8255                 ret = task->tk_status;
8256         rpc_put_task(task);
8257         return ret;
8258 }
8259
8260 static void
8261 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8262 {
8263         struct rpc_task *task;
8264         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8265
8266         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8267         nfs4_free_lock_state(server, lsp);
8268         if (IS_ERR(task))
8269                 return;
8270         rpc_put_task(task);
8271 }
8272
8273 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8274                 const nfs4_stateid *s2)
8275 {
8276         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8277                 return false;
8278
8279         if (s1->seqid == s2->seqid)
8280                 return true;
8281         if (s1->seqid == 0 || s2->seqid == 0)
8282                 return true;
8283
8284         return false;
8285 }
8286
8287 #endif /* CONFIG_NFS_V4_1 */
8288
8289 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8290                 const nfs4_stateid *s2)
8291 {
8292         return nfs4_stateid_match(s1, s2);
8293 }
8294
8295
8296 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8297         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8298         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8299         .recover_open   = nfs4_open_reclaim,
8300         .recover_lock   = nfs4_lock_reclaim,
8301         .establish_clid = nfs4_init_clientid,
8302         .detect_trunking = nfs40_discover_server_trunking,
8303 };
8304
8305 #if defined(CONFIG_NFS_V4_1)
8306 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8307         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8308         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8309         .recover_open   = nfs4_open_reclaim,
8310         .recover_lock   = nfs4_lock_reclaim,
8311         .establish_clid = nfs41_init_clientid,
8312         .reclaim_complete = nfs41_proc_reclaim_complete,
8313         .detect_trunking = nfs41_discover_server_trunking,
8314 };
8315 #endif /* CONFIG_NFS_V4_1 */
8316
8317 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8318         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8319         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8320         .recover_open   = nfs4_open_expired,
8321         .recover_lock   = nfs4_lock_expired,
8322         .establish_clid = nfs4_init_clientid,
8323 };
8324
8325 #if defined(CONFIG_NFS_V4_1)
8326 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8327         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8328         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8329         .recover_open   = nfs41_open_expired,
8330         .recover_lock   = nfs41_lock_expired,
8331         .establish_clid = nfs41_init_clientid,
8332 };
8333 #endif /* CONFIG_NFS_V4_1 */
8334
8335 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8336         .sched_state_renewal = nfs4_proc_async_renew,
8337         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8338         .renew_lease = nfs4_proc_renew,
8339 };
8340
8341 #if defined(CONFIG_NFS_V4_1)
8342 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8343         .sched_state_renewal = nfs41_proc_async_sequence,
8344         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8345         .renew_lease = nfs4_proc_sequence,
8346 };
8347 #endif
8348
8349 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8350         .get_locations = _nfs40_proc_get_locations,
8351         .fsid_present = _nfs40_proc_fsid_present,
8352 };
8353
8354 #if defined(CONFIG_NFS_V4_1)
8355 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8356         .get_locations = _nfs41_proc_get_locations,
8357         .fsid_present = _nfs41_proc_fsid_present,
8358 };
8359 #endif  /* CONFIG_NFS_V4_1 */
8360
8361 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8362         .minor_version = 0,
8363         .init_caps = NFS_CAP_READDIRPLUS
8364                 | NFS_CAP_ATOMIC_OPEN
8365                 | NFS_CAP_CHANGE_ATTR
8366                 | NFS_CAP_POSIX_LOCK,
8367         .init_client = nfs40_init_client,
8368         .shutdown_client = nfs40_shutdown_client,
8369         .match_stateid = nfs4_match_stateid,
8370         .find_root_sec = nfs4_find_root_sec,
8371         .free_lock_state = nfs4_release_lockowner,
8372         .call_sync_ops = &nfs40_call_sync_ops,
8373         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8374         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8375         .state_renewal_ops = &nfs40_state_renewal_ops,
8376         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8377 };
8378
8379 #if defined(CONFIG_NFS_V4_1)
8380 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8381         .minor_version = 1,
8382         .init_caps = NFS_CAP_READDIRPLUS
8383                 | NFS_CAP_ATOMIC_OPEN
8384                 | NFS_CAP_CHANGE_ATTR
8385                 | NFS_CAP_POSIX_LOCK
8386                 | NFS_CAP_STATEID_NFSV41
8387                 | NFS_CAP_ATOMIC_OPEN_V1,
8388         .init_client = nfs41_init_client,
8389         .shutdown_client = nfs41_shutdown_client,
8390         .match_stateid = nfs41_match_stateid,
8391         .find_root_sec = nfs41_find_root_sec,
8392         .free_lock_state = nfs41_free_lock_state,
8393         .call_sync_ops = &nfs41_call_sync_ops,
8394         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8395         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8396         .state_renewal_ops = &nfs41_state_renewal_ops,
8397         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8398 };
8399 #endif
8400
8401 #if defined(CONFIG_NFS_V4_2)
8402 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8403         .minor_version = 2,
8404         .init_caps = NFS_CAP_READDIRPLUS
8405                 | NFS_CAP_ATOMIC_OPEN
8406                 | NFS_CAP_CHANGE_ATTR
8407                 | NFS_CAP_POSIX_LOCK
8408                 | NFS_CAP_STATEID_NFSV41
8409                 | NFS_CAP_ATOMIC_OPEN_V1,
8410         .init_client = nfs41_init_client,
8411         .shutdown_client = nfs41_shutdown_client,
8412         .match_stateid = nfs41_match_stateid,
8413         .find_root_sec = nfs41_find_root_sec,
8414         .free_lock_state = nfs41_free_lock_state,
8415         .call_sync_ops = &nfs41_call_sync_ops,
8416         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8417         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8418         .state_renewal_ops = &nfs41_state_renewal_ops,
8419 };
8420 #endif
8421
8422 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8423         [0] = &nfs_v4_0_minor_ops,
8424 #if defined(CONFIG_NFS_V4_1)
8425         [1] = &nfs_v4_1_minor_ops,
8426 #endif
8427 #if defined(CONFIG_NFS_V4_2)
8428         [2] = &nfs_v4_2_minor_ops,
8429 #endif
8430 };
8431
8432 static const struct inode_operations nfs4_dir_inode_operations = {
8433         .create         = nfs_create,
8434         .lookup         = nfs_lookup,
8435         .atomic_open    = nfs_atomic_open,
8436         .link           = nfs_link,
8437         .unlink         = nfs_unlink,
8438         .symlink        = nfs_symlink,
8439         .mkdir          = nfs_mkdir,
8440         .rmdir          = nfs_rmdir,
8441         .mknod          = nfs_mknod,
8442         .rename         = nfs_rename,
8443         .permission     = nfs_permission,
8444         .getattr        = nfs_getattr,
8445         .setattr        = nfs_setattr,
8446         .getxattr       = generic_getxattr,
8447         .setxattr       = generic_setxattr,
8448         .listxattr      = generic_listxattr,
8449         .removexattr    = generic_removexattr,
8450 };
8451
8452 static const struct inode_operations nfs4_file_inode_operations = {
8453         .permission     = nfs_permission,
8454         .getattr        = nfs_getattr,
8455         .setattr        = nfs_setattr,
8456         .getxattr       = generic_getxattr,
8457         .setxattr       = generic_setxattr,
8458         .listxattr      = generic_listxattr,
8459         .removexattr    = generic_removexattr,
8460 };
8461
8462 const struct nfs_rpc_ops nfs_v4_clientops = {
8463         .version        = 4,                    /* protocol version */
8464         .dentry_ops     = &nfs4_dentry_operations,
8465         .dir_inode_ops  = &nfs4_dir_inode_operations,
8466         .file_inode_ops = &nfs4_file_inode_operations,
8467         .file_ops       = &nfs4_file_operations,
8468         .getroot        = nfs4_proc_get_root,
8469         .submount       = nfs4_submount,
8470         .try_mount      = nfs4_try_mount,
8471         .getattr        = nfs4_proc_getattr,
8472         .setattr        = nfs4_proc_setattr,
8473         .lookup         = nfs4_proc_lookup,
8474         .access         = nfs4_proc_access,
8475         .readlink       = nfs4_proc_readlink,
8476         .create         = nfs4_proc_create,
8477         .remove         = nfs4_proc_remove,
8478         .unlink_setup   = nfs4_proc_unlink_setup,
8479         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8480         .unlink_done    = nfs4_proc_unlink_done,
8481         .rename_setup   = nfs4_proc_rename_setup,
8482         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8483         .rename_done    = nfs4_proc_rename_done,
8484         .link           = nfs4_proc_link,
8485         .symlink        = nfs4_proc_symlink,
8486         .mkdir          = nfs4_proc_mkdir,
8487         .rmdir          = nfs4_proc_remove,
8488         .readdir        = nfs4_proc_readdir,
8489         .mknod          = nfs4_proc_mknod,
8490         .statfs         = nfs4_proc_statfs,
8491         .fsinfo         = nfs4_proc_fsinfo,
8492         .pathconf       = nfs4_proc_pathconf,
8493         .set_capabilities = nfs4_server_capabilities,
8494         .decode_dirent  = nfs4_decode_dirent,
8495         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8496         .read_setup     = nfs4_proc_read_setup,
8497         .read_done      = nfs4_read_done,
8498         .write_setup    = nfs4_proc_write_setup,
8499         .write_done     = nfs4_write_done,
8500         .commit_setup   = nfs4_proc_commit_setup,
8501         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8502         .commit_done    = nfs4_commit_done,
8503         .lock           = nfs4_proc_lock,
8504         .clear_acl_cache = nfs4_zap_acl_attr,
8505         .close_context  = nfs4_close_context,
8506         .open_context   = nfs4_atomic_open,
8507         .have_delegation = nfs4_have_delegation,
8508         .return_delegation = nfs4_inode_return_delegation,
8509         .alloc_client   = nfs4_alloc_client,
8510         .init_client    = nfs4_init_client,
8511         .free_client    = nfs4_free_client,
8512         .create_server  = nfs4_create_server,
8513         .clone_server   = nfs_clone_server,
8514 };
8515
8516 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8517         .prefix = XATTR_NAME_NFSV4_ACL,
8518         .list   = nfs4_xattr_list_nfs4_acl,
8519         .get    = nfs4_xattr_get_nfs4_acl,
8520         .set    = nfs4_xattr_set_nfs4_acl,
8521 };
8522
8523 const struct xattr_handler *nfs4_xattr_handlers[] = {
8524         &nfs4_xattr_nfs4_acl_handler,
8525 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8526         &nfs4_xattr_nfs4_label_handler,
8527 #endif
8528         NULL
8529 };
8530
8531 /*
8532  * Local variables:
8533  *  c-basic-offset: 8
8534  * End:
8535  */