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 (!RPC_WAS_SENT(task))
 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         bool send_new_highest_used_slotid = false;
 563
 564         if (!res->sr_slot) {
 565                 /* just wake up the next guy waiting since
 566                  * we may have not consumed a slot after all */
 567                 dprintk("%s: No slot\n", __func__);
 568                 return;
 569         }
 570         tbl = res->sr_slot->table;
 571         session = tbl->session;
 572
 573         spin_lock(&tbl->slot_tbl_lock);
 574         /* Be nice to the server: try to ensure that the last transmitted
 575          * value for highest_user_slotid <= target_highest_slotid
 576          */
 577         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 578                 send_new_highest_used_slotid = true;
 579
 580         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 581                 send_new_highest_used_slotid = false;
 582                 goto out_unlock;
 583         }
 584         nfs4_free_slot(tbl, res->sr_slot);
 585
 586         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 587                 send_new_highest_used_slotid = false;
 588 out_unlock:
 589         spin_unlock(&tbl->slot_tbl_lock);
 590         res->sr_slot = NULL;
 591         if (send_new_highest_used_slotid)
 592                 nfs41_server_notify_highest_slotid_update(session->clp);
 593 }
 594
 595 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 596 {
 597         struct nfs4_session *session;
 598         struct nfs4_slot *slot;
 599         struct nfs_client *clp;
 600         bool interrupted = false;
 601         int ret = 1;
 602
 603         /* don't increment the sequence number if the task wasn't sent */
 604         if (!RPC_WAS_SENT(task))
 605                 goto out;
 606
 607         slot = res->sr_slot;
 608         session = slot->table->session;
 609
 610         if (slot->interrupted) {
 611                 slot->interrupted = 0;
 612                 interrupted = true;
 613         }
 614
 615         trace_nfs4_sequence_done(session, res);
 616         /* Check the SEQUENCE operation status */
 617         switch (res->sr_status) {
 618         case 0:
 619                 /* Update the slot's sequence and clientid lease timer */
 620                 ++slot->seq_nr;
 621                 clp = session->clp;
 622                 do_renew_lease(clp, res->sr_timestamp);
 623                 /* Check sequence flags */
 624                 if (res->sr_status_flags != 0)
 625                         nfs4_schedule_lease_recovery(clp);
 626                 nfs41_update_target_slotid(slot->table, slot, res);
 627                 break;
 628         case 1:
 629                 /*
 630                  * sr_status remains 1 if an RPC level error occurred.
 631                  * The server may or may not have processed the sequence
 632                  * operation..
 633                  * Mark the slot as having hosted an interrupted RPC call.
 634                  */
 635                 slot->interrupted = 1;
 636                 goto out;
 637         case -NFS4ERR_DELAY:
 638                 /* The server detected a resend of the RPC call and
 639                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 640                  * of RFC5661.
 641                  */
 642                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 643                         __func__,
 644                         slot->slot_nr,
 645                         slot->seq_nr);
 646                 goto out_retry;
 647         case -NFS4ERR_BADSLOT:
 648                 /*
 649                  * The slot id we used was probably retired. Try again
 650                  * using a different slot id.
 651                  */
 652                 goto retry_nowait;
 653         case -NFS4ERR_SEQ_MISORDERED:
 654                 /*
 655                  * Was the last operation on this sequence interrupted?
 656                  * If so, retry after bumping the sequence number.
 657                  */
 658                 if (interrupted) {
 659                         ++slot->seq_nr;
 660                         goto retry_nowait;
 661                 }
 662                 /*
 663                  * Could this slot have been previously retired?
 664                  * If so, then the server may be expecting seq_nr = 1!
 665                  */
 666                 if (slot->seq_nr != 1) {
 667                         slot->seq_nr = 1;
 668                         goto retry_nowait;
 669                 }
 670                 break;
 671         case -NFS4ERR_SEQ_FALSE_RETRY:
 672                 ++slot->seq_nr;
 673                 goto retry_nowait;
 674         default:
 675                 /* Just update the slot sequence no. */
 676                 ++slot->seq_nr;
 677         }
 678 out:
 679         /* The session may be reset by one of the error handlers. */
 680         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 681         nfs41_sequence_free_slot(res);
 682         return ret;
 683 retry_nowait:
 684         if (rpc_restart_call_prepare(task)) {
 685                 task->tk_status = 0;
 686                 ret = 0;
 687         }
 688         goto out;
 689 out_retry:
 690         if (!rpc_restart_call(task))
 691                 goto out;
 692         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 693         return 0;
 694 }
 695
 696 static int nfs4_sequence_done(struct rpc_task *task,
 697                                struct nfs4_sequence_res *res)
 698 {
 699         if (res->sr_slot == NULL)
 700                 return 1;
 701         if (!res->sr_slot->table->session)
 702                 return nfs40_sequence_done(task, res);
 703         return nfs41_sequence_done(task, res);
 704 }
 705
 706 int nfs41_setup_sequence(struct nfs4_session *session,
 707                                 struct nfs4_sequence_args *args,
 708                                 struct nfs4_sequence_res *res,
 709                                 struct rpc_task *task)
 710 {
 711         struct nfs4_slot *slot;
 712         struct nfs4_slot_table *tbl;
 713
 714         dprintk("--> %s\n", __func__);
 715         /* slot already allocated? */
 716         if (res->sr_slot != NULL)
 717                 goto out_success;
 718
 719         tbl = &session->fc_slot_table;
 720
 721         task->tk_timeout = 0;
 722
 723         spin_lock(&tbl->slot_tbl_lock);
 724         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 725             !args->sa_privileged) {
 726                 /* The state manager will wait until the slot table is empty */
 727                 dprintk("%s session is draining\n", __func__);
 728                 goto out_sleep;
 729         }
 730
 731         slot = nfs4_alloc_slot(tbl);
 732         if (IS_ERR(slot)) {
 733                 /* If out of memory, try again in 1/4 second */
 734                 if (slot == ERR_PTR(-ENOMEM))
 735                         task->tk_timeout = HZ >> 2;
 736                 dprintk("<-- %s: no free slots\n", __func__);
 737                 goto out_sleep;
 738         }
 739         spin_unlock(&tbl->slot_tbl_lock);
 740
 741         args->sa_slot = slot;
 742
 743         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 744                         slot->slot_nr, slot->seq_nr);
 745
 746         res->sr_slot = slot;
 747         res->sr_timestamp = jiffies;
 748         res->sr_status_flags = 0;
 749         /*
 750          * sr_status is only set in decode_sequence, and so will remain
 751          * set to 1 if an rpc level failure occurs.
 752          */
 753         res->sr_status = 1;
 754         trace_nfs4_setup_sequence(session, args);
 755 out_success:
 756         rpc_call_start(task);
 757         return 0;
 758 out_sleep:
 759         /* Privileged tasks are queued with top priority */
 760         if (args->sa_privileged)
 761                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 762                                 NULL, RPC_PRIORITY_PRIVILEGED);
 763         else
 764                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 765         spin_unlock(&tbl->slot_tbl_lock);
 766         return -EAGAIN;
 767 }
 768 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 769
 770 static int nfs4_setup_sequence(const struct nfs_server *server,
 771                                struct nfs4_sequence_args *args,
 772                                struct nfs4_sequence_res *res,
 773                                struct rpc_task *task)
 774 {
 775         struct nfs4_session *session = nfs4_get_session(server);
 776         int ret = 0;
 777
 778         if (!session)
 779                 return nfs40_setup_sequence(server, args, res, task);
 780
 781         dprintk("--> %s clp %p session %p sr_slot %u\n",
 782                 __func__, session->clp, session, res->sr_slot ?
 783                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 784
 785         ret = nfs41_setup_sequence(session, args, res, task);
 786
 787         dprintk("<-- %s status=%d\n", __func__, ret);
 788         return ret;
 789 }
 790
 791 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 792 {
 793         struct nfs4_call_sync_data *data = calldata;
 794         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 795
 796         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 797
 798         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 799 }
 800
 801 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 802 {
 803         struct nfs4_call_sync_data *data = calldata;
 804
 805         nfs41_sequence_done(task, data->seq_res);
 806 }
 807
 808 static const struct rpc_call_ops nfs41_call_sync_ops = {
 809         .rpc_call_prepare = nfs41_call_sync_prepare,
 810         .rpc_call_done = nfs41_call_sync_done,
 811 };
 812
 813 #else   /* !CONFIG_NFS_V4_1 */
 814
 815 static int nfs4_setup_sequence(const struct nfs_server *server,
 816                                struct nfs4_sequence_args *args,
 817                                struct nfs4_sequence_res *res,
 818                                struct rpc_task *task)
 819 {
 820         return nfs40_setup_sequence(server, args, res, task);
 821 }
 822
 823 static int nfs4_sequence_done(struct rpc_task *task,
 824                                struct nfs4_sequence_res *res)
 825 {
 826         return nfs40_sequence_done(task, res);
 827 }
 828
 829 #endif  /* !CONFIG_NFS_V4_1 */
 830
 831 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 832 {
 833         struct nfs4_call_sync_data *data = calldata;
 834         nfs4_setup_sequence(data->seq_server,
 835                                 data->seq_args, data->seq_res, task);
 836 }
 837
 838 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 839 {
 840         struct nfs4_call_sync_data *data = calldata;
 841         nfs4_sequence_done(task, data->seq_res);
 842 }
 843
 844 static const struct rpc_call_ops nfs40_call_sync_ops = {
 845         .rpc_call_prepare = nfs40_call_sync_prepare,
 846         .rpc_call_done = nfs40_call_sync_done,
 847 };
 848
 849 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 850                                    struct nfs_server *server,
 851                                    struct rpc_message *msg,
 852                                    struct nfs4_sequence_args *args,
 853                                    struct nfs4_sequence_res *res)
 854 {
 855         int ret;
 856         struct rpc_task *task;
 857         struct nfs_client *clp = server->nfs_client;
 858         struct nfs4_call_sync_data data = {
 859                 .seq_server = server,
 860                 .seq_args = args,
 861                 .seq_res = res,
 862         };
 863         struct rpc_task_setup task_setup = {
 864                 .rpc_client = clnt,
 865                 .rpc_message = msg,
 866                 .callback_ops = clp->cl_mvops->call_sync_ops,
 867                 .callback_data = &data
 868         };
 869
 870         task = rpc_run_task(&task_setup);
 871         if (IS_ERR(task))
 872                 ret = PTR_ERR(task);
 873         else {
 874                 ret = task->tk_status;
 875                 rpc_put_task(task);
 876         }
 877         return ret;
 878 }
 879
 880 static
 881 int nfs4_call_sync(struct rpc_clnt *clnt,
 882                    struct nfs_server *server,
 883                    struct rpc_message *msg,
 884                    struct nfs4_sequence_args *args,
 885                    struct nfs4_sequence_res *res,
 886                    int cache_reply)
 887 {
 888         nfs4_init_sequence(args, res, cache_reply);
 889         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 890 }
 891
 892 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 893 {
 894         struct nfs_inode *nfsi = NFS_I(dir);
 895
 896         spin_lock(&dir->i_lock);
 897         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 898         if (!cinfo->atomic || cinfo->before != dir->i_version)
 899                 nfs_force_lookup_revalidate(dir);
 900         dir->i_version = cinfo->after;
 901         nfs_fscache_invalidate(dir);
 902         spin_unlock(&dir->i_lock);
 903 }
 904
 905 struct nfs4_opendata {
 906         struct kref kref;
 907         struct nfs_openargs o_arg;
 908         struct nfs_openres o_res;
 909         struct nfs_open_confirmargs c_arg;
 910         struct nfs_open_confirmres c_res;
 911         struct nfs4_string owner_name;
 912         struct nfs4_string group_name;
 913         struct nfs_fattr f_attr;
 914         struct nfs4_label *f_label;
 915         struct dentry *dir;
 916         struct dentry *dentry;
 917         struct nfs4_state_owner *owner;
 918         struct nfs4_state *state;
 919         struct iattr attrs;
 920         unsigned long timestamp;
 921         unsigned int rpc_done : 1;
 922         unsigned int file_created : 1;
 923         unsigned int is_recover : 1;
 924         int rpc_status;
 925         int cancelled;
 926 };
 927
 928 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 929                 int err, struct nfs4_exception *exception)
 930 {
 931         if (err != -EINVAL)
 932                 return false;
 933         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 934                 return false;
 935         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 936         exception->retry = 1;
 937         return true;
 938 }
 939
 940 static enum open_claim_type4
 941 nfs4_map_atomic_open_claim(struct nfs_server *server,
 942                 enum open_claim_type4 claim)
 943 {
 944         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 945                 return claim;
 946         switch (claim) {
 947         default:
 948                 return claim;
 949         case NFS4_OPEN_CLAIM_FH:
 950                 return NFS4_OPEN_CLAIM_NULL;
 951         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 952                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 953         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 954                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 955         }
 956 }
 957
 958 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 959 {
 960         p->o_res.f_attr = &p->f_attr;
 961         p->o_res.f_label = p->f_label;
 962         p->o_res.seqid = p->o_arg.seqid;
 963         p->c_res.seqid = p->c_arg.seqid;
 964         p->o_res.server = p->o_arg.server;
 965         p->o_res.access_request = p->o_arg.access;
 966         nfs_fattr_init(&p->f_attr);
 967         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 968 }
 969
 970 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 971                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 972                 const struct iattr *attrs,
 973                 struct nfs4_label *label,
 974                 enum open_claim_type4 claim,
 975                 gfp_t gfp_mask)
 976 {
 977         struct dentry *parent = dget_parent(dentry);
 978         struct inode *dir = parent->d_inode;
 979         struct nfs_server *server = NFS_SERVER(dir);
 980         struct nfs4_opendata *p;
 981
 982         p = kzalloc(sizeof(*p), gfp_mask);
 983         if (p == NULL)
 984                 goto err;
 985
 986         p->f_label = nfs4_label_alloc(server, gfp_mask);
 987         if (IS_ERR(p->f_label))
 988                 goto err_free_p;
 989
 990         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 991         if (p->o_arg.seqid == NULL)
 992                 goto err_free_label;
 993         nfs_sb_active(dentry->d_sb);
 994         p->dentry = dget(dentry);
 995         p->dir = parent;
 996         p->owner = sp;
 997         atomic_inc(&sp->so_count);
 998         p->o_arg.open_flags = flags;
 999         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1000         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1001          * will return permission denied for all bits until close */
1002         if (!(flags & O_EXCL)) {
1003                 /* ask server to check for all possible rights as results
1004                  * are cached */
1005                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1006                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1007         }
1008         p->o_arg.clientid = server->nfs_client->cl_clientid;
1009         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1010         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1011         p->o_arg.name = &dentry->d_name;
1012         p->o_arg.server = server;
1013         p->o_arg.bitmask = nfs4_bitmask(server, label);
1014         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1015         p->o_arg.label = label;
1016         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1017         switch (p->o_arg.claim) {
1018         case NFS4_OPEN_CLAIM_NULL:
1019         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1020         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1021                 p->o_arg.fh = NFS_FH(dir);
1022                 break;
1023         case NFS4_OPEN_CLAIM_PREVIOUS:
1024         case NFS4_OPEN_CLAIM_FH:
1025         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1026         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1027                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1028         }
1029         if (attrs != NULL && attrs->ia_valid != 0) {
1030                 __u32 verf[2];
1031
1032                 p->o_arg.u.attrs = &p->attrs;
1033                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1034
1035                 verf[0] = jiffies;
1036                 verf[1] = current->pid;
1037                 memcpy(p->o_arg.u.verifier.data, verf,
1038                                 sizeof(p->o_arg.u.verifier.data));
1039         }
1040         p->c_arg.fh = &p->o_res.fh;
1041         p->c_arg.stateid = &p->o_res.stateid;
1042         p->c_arg.seqid = p->o_arg.seqid;
1043         nfs4_init_opendata_res(p);
1044         kref_init(&p->kref);
1045         return p;
1046
1047 err_free_label:
1048         nfs4_label_free(p->f_label);
1049 err_free_p:
1050         kfree(p);
1051 err:
1052         dput(parent);
1053         return NULL;
1054 }
1055
1056 static void nfs4_opendata_free(struct kref *kref)
1057 {
1058         struct nfs4_opendata *p = container_of(kref,
1059                         struct nfs4_opendata, kref);
1060         struct super_block *sb = p->dentry->d_sb;
1061
1062         nfs_free_seqid(p->o_arg.seqid);
1063         if (p->state != NULL)
1064                 nfs4_put_open_state(p->state);
1065         nfs4_put_state_owner(p->owner);
1066
1067         nfs4_label_free(p->f_label);
1068
1069         dput(p->dir);
1070         dput(p->dentry);
1071         nfs_sb_deactive(sb);
1072         nfs_fattr_free_names(&p->f_attr);
1073         kfree(p);
1074 }
1075
1076 static void nfs4_opendata_put(struct nfs4_opendata *p)
1077 {
1078         if (p != NULL)
1079                 kref_put(&p->kref, nfs4_opendata_free);
1080 }
1081
1082 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1083 {
1084         int ret;
1085
1086         ret = rpc_wait_for_completion_task(task);
1087         return ret;
1088 }
1089
1090 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1091 {
1092         int ret = 0;
1093
1094         if (open_mode & (O_EXCL|O_TRUNC))
1095                 goto out;
1096         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1097                 case FMODE_READ:
1098                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1099                                 && state->n_rdonly != 0;
1100                         break;
1101                 case FMODE_WRITE:
1102                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1103                                 && state->n_wronly != 0;
1104                         break;
1105                 case FMODE_READ|FMODE_WRITE:
1106                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1107                                 && state->n_rdwr != 0;
1108         }
1109 out:
1110         return ret;
1111 }
1112
1113 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1114 {
1115         if (delegation == NULL)
1116                 return 0;
1117         if ((delegation->type & fmode) != fmode)
1118                 return 0;
1119         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1120                 return 0;
1121         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1122                 return 0;
1123         nfs_mark_delegation_referenced(delegation);
1124         return 1;
1125 }
1126
1127 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1128 {
1129         switch (fmode) {
1130                 case FMODE_WRITE:
1131                         state->n_wronly++;
1132                         break;
1133                 case FMODE_READ:
1134                         state->n_rdonly++;
1135                         break;
1136                 case FMODE_READ|FMODE_WRITE:
1137                         state->n_rdwr++;
1138         }
1139         nfs4_state_set_mode_locked(state, state->state | fmode);
1140 }
1141
1142 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1143 {
1144         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1145                 nfs4_stateid_copy(&state->stateid, stateid);
1146         nfs4_stateid_copy(&state->open_stateid, stateid);
1147         set_bit(NFS_OPEN_STATE, &state->flags);
1148         switch (fmode) {
1149                 case FMODE_READ:
1150                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1151                         break;
1152                 case FMODE_WRITE:
1153                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1154                         break;
1155                 case FMODE_READ|FMODE_WRITE:
1156                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1157         }
1158 }
1159
1160 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1161 {
1162         write_seqlock(&state->seqlock);
1163         nfs_set_open_stateid_locked(state, stateid, fmode);
1164         write_sequnlock(&state->seqlock);
1165 }
1166
1167 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1168 {
1169         /*
1170          * Protect the call to nfs4_state_set_mode_locked and
1171          * serialise the stateid update
1172          */
1173         write_seqlock(&state->seqlock);
1174         if (deleg_stateid != NULL) {
1175                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1176                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1177         }
1178         if (open_stateid != NULL)
1179                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1180         write_sequnlock(&state->seqlock);
1181         spin_lock(&state->owner->so_lock);
1182         update_open_stateflags(state, fmode);
1183         spin_unlock(&state->owner->so_lock);
1184 }
1185
1186 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1187 {
1188         struct nfs_inode *nfsi = NFS_I(state->inode);
1189         struct nfs_delegation *deleg_cur;
1190         int ret = 0;
1191
1192         fmode &= (FMODE_READ|FMODE_WRITE);
1193
1194         rcu_read_lock();
1195         deleg_cur = rcu_dereference(nfsi->delegation);
1196         if (deleg_cur == NULL)
1197                 goto no_delegation;
1198
1199         spin_lock(&deleg_cur->lock);
1200         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1201            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1202             (deleg_cur->type & fmode) != fmode)
1203                 goto no_delegation_unlock;
1204
1205         if (delegation == NULL)
1206                 delegation = &deleg_cur->stateid;
1207         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1208                 goto no_delegation_unlock;
1209
1210         nfs_mark_delegation_referenced(deleg_cur);
1211         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1212         ret = 1;
1213 no_delegation_unlock:
1214         spin_unlock(&deleg_cur->lock);
1215 no_delegation:
1216         rcu_read_unlock();
1217
1218         if (!ret && open_stateid != NULL) {
1219                 __update_open_stateid(state, open_stateid, NULL, fmode);
1220                 ret = 1;
1221         }
1222
1223         return ret;
1224 }
1225
1226
1227 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1228 {
1229         struct nfs_delegation *delegation;
1230
1231         rcu_read_lock();
1232         delegation = rcu_dereference(NFS_I(inode)->delegation);
1233         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1234                 rcu_read_unlock();
1235                 return;
1236         }
1237         rcu_read_unlock();
1238         nfs4_inode_return_delegation(inode);
1239 }
1240
1241 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1242 {
1243         struct nfs4_state *state = opendata->state;
1244         struct nfs_inode *nfsi = NFS_I(state->inode);
1245         struct nfs_delegation *delegation;
1246         int open_mode = opendata->o_arg.open_flags;
1247         fmode_t fmode = opendata->o_arg.fmode;
1248         nfs4_stateid stateid;
1249         int ret = -EAGAIN;
1250
1251         for (;;) {
1252                 if (can_open_cached(state, fmode, open_mode)) {
1253                         spin_lock(&state->owner->so_lock);
1254                         if (can_open_cached(state, fmode, open_mode)) {
1255                                 update_open_stateflags(state, fmode);
1256                                 spin_unlock(&state->owner->so_lock);
1257                                 goto out_return_state;
1258                         }
1259                         spin_unlock(&state->owner->so_lock);
1260                 }
1261                 rcu_read_lock();
1262                 delegation = rcu_dereference(nfsi->delegation);
1263                 if (!can_open_delegated(delegation, fmode)) {
1264                         rcu_read_unlock();
1265                         break;
1266                 }
1267                 /* Save the delegation */
1268                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1269                 rcu_read_unlock();
1270                 nfs_release_seqid(opendata->o_arg.seqid);
1271                 if (!opendata->is_recover) {
1272                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1273                         if (ret != 0)
1274                                 goto out;
1275                 }
1276                 ret = -EAGAIN;
1277
1278                 /* Try to update the stateid using the delegation */
1279                 if (update_open_stateid(state, NULL, &stateid, fmode))
1280                         goto out_return_state;
1281         }
1282 out:
1283         return ERR_PTR(ret);
1284 out_return_state:
1285         atomic_inc(&state->count);
1286         return state;
1287 }
1288
1289 static void
1290 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1291 {
1292         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1293         struct nfs_delegation *delegation;
1294         int delegation_flags = 0;
1295
1296         rcu_read_lock();
1297         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1298         if (delegation)
1299                 delegation_flags = delegation->flags;
1300         rcu_read_unlock();
1301         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1302                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1303                                    "returning a delegation for "
1304                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1305                                    clp->cl_hostname);
1306         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1307                 nfs_inode_set_delegation(state->inode,
1308                                          data->owner->so_cred,
1309                                          &data->o_res);
1310         else
1311                 nfs_inode_reclaim_delegation(state->inode,
1312                                              data->owner->so_cred,
1313                                              &data->o_res);
1314 }
1315
1316 /*
1317  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1318  * and update the nfs4_state.
1319  */
1320 static struct nfs4_state *
1321 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1322 {
1323         struct inode *inode = data->state->inode;
1324         struct nfs4_state *state = data->state;
1325         int ret;
1326
1327         if (!data->rpc_done) {
1328                 if (data->rpc_status) {
1329                         ret = data->rpc_status;
1330                         goto err;
1331                 }
1332                 /* cached opens have already been processed */
1333                 goto update;
1334         }
1335
1336         ret = nfs_refresh_inode(inode, &data->f_attr);
1337         if (ret)
1338                 goto err;
1339
1340         if (data->o_res.delegation_type != 0)
1341                 nfs4_opendata_check_deleg(data, state);
1342 update:
1343         update_open_stateid(state, &data->o_res.stateid, NULL,
1344                             data->o_arg.fmode);
1345         atomic_inc(&state->count);
1346
1347         return state;
1348 err:
1349         return ERR_PTR(ret);
1350
1351 }
1352
1353 static struct nfs4_state *
1354 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1355 {
1356         struct inode *inode;
1357         struct nfs4_state *state = NULL;
1358         int ret;
1359
1360         if (!data->rpc_done) {
1361                 state = nfs4_try_open_cached(data);
1362                 goto out;
1363         }
1364
1365         ret = -EAGAIN;
1366         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1367                 goto err;
1368         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1369         ret = PTR_ERR(inode);
1370         if (IS_ERR(inode))
1371                 goto err;
1372         ret = -ENOMEM;
1373         state = nfs4_get_open_state(inode, data->owner);
1374         if (state == NULL)
1375                 goto err_put_inode;
1376         if (data->o_res.delegation_type != 0)
1377                 nfs4_opendata_check_deleg(data, state);
1378         update_open_stateid(state, &data->o_res.stateid, NULL,
1379                         data->o_arg.fmode);
1380         iput(inode);
1381 out:
1382         nfs_release_seqid(data->o_arg.seqid);
1383         return state;
1384 err_put_inode:
1385         iput(inode);
1386 err:
1387         return ERR_PTR(ret);
1388 }
1389
1390 static struct nfs4_state *
1391 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1392 {
1393         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1394                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1395         return _nfs4_opendata_to_nfs4_state(data);
1396 }
1397
1398 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1399 {
1400         struct nfs_inode *nfsi = NFS_I(state->inode);
1401         struct nfs_open_context *ctx;
1402
1403         spin_lock(&state->inode->i_lock);
1404         list_for_each_entry(ctx, &nfsi->open_files, list) {
1405                 if (ctx->state != state)
1406                         continue;
1407                 get_nfs_open_context(ctx);
1408                 spin_unlock(&state->inode->i_lock);
1409                 return ctx;
1410         }
1411         spin_unlock(&state->inode->i_lock);
1412         return ERR_PTR(-ENOENT);
1413 }
1414
1415 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1416                 struct nfs4_state *state, enum open_claim_type4 claim)
1417 {
1418         struct nfs4_opendata *opendata;
1419
1420         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1421                         NULL, NULL, claim, GFP_NOFS);
1422         if (opendata == NULL)
1423                 return ERR_PTR(-ENOMEM);
1424         opendata->state = state;
1425         atomic_inc(&state->count);
1426         return opendata;
1427 }
1428
1429 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1430 {
1431         struct nfs4_state *newstate;
1432         int ret;
1433
1434         opendata->o_arg.open_flags = 0;
1435         opendata->o_arg.fmode = fmode;
1436         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1437         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1438         nfs4_init_opendata_res(opendata);
1439         ret = _nfs4_recover_proc_open(opendata);
1440         if (ret != 0)
1441                 return ret;
1442         newstate = nfs4_opendata_to_nfs4_state(opendata);
1443         if (IS_ERR(newstate))
1444                 return PTR_ERR(newstate);
1445         nfs4_close_state(newstate, fmode);
1446         *res = newstate;
1447         return 0;
1448 }
1449
1450 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1451 {
1452         struct nfs4_state *newstate;
1453         int ret;
1454
1455         /* memory barrier prior to reading state->n_* */
1456         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1457         clear_bit(NFS_OPEN_STATE, &state->flags);
1458         smp_rmb();
1459         if (state->n_rdwr != 0) {
1460                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1461                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1462                 if (ret != 0)
1463                         return ret;
1464                 if (newstate != state)
1465                         return -ESTALE;
1466         }
1467         if (state->n_wronly != 0) {
1468                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1469                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1470                 if (ret != 0)
1471                         return ret;
1472                 if (newstate != state)
1473                         return -ESTALE;
1474         }
1475         if (state->n_rdonly != 0) {
1476                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1477                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1478                 if (ret != 0)
1479                         return ret;
1480                 if (newstate != state)
1481                         return -ESTALE;
1482         }
1483         /*
1484          * We may have performed cached opens for all three recoveries.
1485          * Check if we need to update the current stateid.
1486          */
1487         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1488             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1489                 write_seqlock(&state->seqlock);
1490                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1491                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1492                 write_sequnlock(&state->seqlock);
1493         }
1494         return 0;
1495 }
1496
1497 /*
1498  * OPEN_RECLAIM:
1499  *      reclaim state on the server after a reboot.
1500  */
1501 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1502 {
1503         struct nfs_delegation *delegation;
1504         struct nfs4_opendata *opendata;
1505         fmode_t delegation_type = 0;
1506         int status;
1507
1508         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1509                         NFS4_OPEN_CLAIM_PREVIOUS);
1510         if (IS_ERR(opendata))
1511                 return PTR_ERR(opendata);
1512         rcu_read_lock();
1513         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1514         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1515                 delegation_type = delegation->type;
1516         rcu_read_unlock();
1517         opendata->o_arg.u.delegation_type = delegation_type;
1518         status = nfs4_open_recover(opendata, state);
1519         nfs4_opendata_put(opendata);
1520         return status;
1521 }
1522
1523 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1524 {
1525         struct nfs_server *server = NFS_SERVER(state->inode);
1526         struct nfs4_exception exception = { };
1527         int err;
1528         do {
1529                 err = _nfs4_do_open_reclaim(ctx, state);
1530                 trace_nfs4_open_reclaim(ctx, 0, err);
1531                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1532                         continue;
1533                 if (err != -NFS4ERR_DELAY)
1534                         break;
1535                 nfs4_handle_exception(server, err, &exception);
1536         } while (exception.retry);
1537         return err;
1538 }
1539
1540 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1541 {
1542         struct nfs_open_context *ctx;
1543         int ret;
1544
1545         ctx = nfs4_state_find_open_context(state);
1546         if (IS_ERR(ctx))
1547                 return -EAGAIN;
1548         ret = nfs4_do_open_reclaim(ctx, state);
1549         put_nfs_open_context(ctx);
1550         return ret;
1551 }
1552
1553 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1554 {
1555         switch (err) {
1556                 default:
1557                         printk(KERN_ERR "NFS: %s: unhandled error "
1558                                         "%d.\n", __func__, err);
1559                 case 0:
1560                 case -ENOENT:
1561                 case -ESTALE:
1562                         break;
1563                 case -NFS4ERR_BADSESSION:
1564                 case -NFS4ERR_BADSLOT:
1565                 case -NFS4ERR_BAD_HIGH_SLOT:
1566                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1567                 case -NFS4ERR_DEADSESSION:
1568                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1569                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1570                         return -EAGAIN;
1571                 case -NFS4ERR_STALE_CLIENTID:
1572                 case -NFS4ERR_STALE_STATEID:
1573                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1574                 case -NFS4ERR_EXPIRED:
1575                         /* Don't recall a delegation if it was lost */
1576                         nfs4_schedule_lease_recovery(server->nfs_client);
1577                         return -EAGAIN;
1578                 case -NFS4ERR_MOVED:
1579                         nfs4_schedule_migration_recovery(server);
1580                         return -EAGAIN;
1581                 case -NFS4ERR_LEASE_MOVED:
1582                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1583                         return -EAGAIN;
1584                 case -NFS4ERR_DELEG_REVOKED:
1585                 case -NFS4ERR_ADMIN_REVOKED:
1586                 case -NFS4ERR_BAD_STATEID:
1587                 case -NFS4ERR_OPENMODE:
1588                         nfs_inode_find_state_and_recover(state->inode,
1589                                         stateid);
1590                         nfs4_schedule_stateid_recovery(server, state);
1591                         return 0;
1592                 case -NFS4ERR_DELAY:
1593                 case -NFS4ERR_GRACE:
1594                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1595                         ssleep(1);
1596                         return -EAGAIN;
1597                 case -ENOMEM:
1598                 case -NFS4ERR_DENIED:
1599                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1600                         return 0;
1601         }
1602         return err;
1603 }
1604
1605 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1606 {
1607         struct nfs_server *server = NFS_SERVER(state->inode);
1608         struct nfs4_opendata *opendata;
1609         int err;
1610
1611         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1612                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1613         if (IS_ERR(opendata))
1614                 return PTR_ERR(opendata);
1615         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1616         err = nfs4_open_recover(opendata, state);
1617         nfs4_opendata_put(opendata);
1618         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1619 }
1620
1621 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1622 {
1623         struct nfs4_opendata *data = calldata;
1624
1625         nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
1626                                 &data->o_res.seq_res, task);
1627 }
1628
1629 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1630 {
1631         struct nfs4_opendata *data = calldata;
1632
1633         nfs40_sequence_done(task, &data->o_res.seq_res);
1634
1635         data->rpc_status = task->tk_status;
1636         if (data->rpc_status == 0) {
1637                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1638                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1639                 renew_lease(data->o_res.server, data->timestamp);
1640                 data->rpc_done = 1;
1641         }
1642 }
1643
1644 static void nfs4_open_confirm_release(void *calldata)
1645 {
1646         struct nfs4_opendata *data = calldata;
1647         struct nfs4_state *state = NULL;
1648
1649         /* If this request hasn't been cancelled, do nothing */
1650         if (data->cancelled == 0)
1651                 goto out_free;
1652         /* In case of error, no cleanup! */
1653         if (!data->rpc_done)
1654                 goto out_free;
1655         state = nfs4_opendata_to_nfs4_state(data);
1656         if (!IS_ERR(state))
1657                 nfs4_close_state(state, data->o_arg.fmode);
1658 out_free:
1659         nfs4_opendata_put(data);
1660 }
1661
1662 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1663         .rpc_call_prepare = nfs4_open_confirm_prepare,
1664         .rpc_call_done = nfs4_open_confirm_done,
1665         .rpc_release = nfs4_open_confirm_release,
1666 };
1667
1668 /*
1669  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1670  */
1671 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1672 {
1673         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1674         struct rpc_task *task;
1675         struct  rpc_message msg = {
1676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1677                 .rpc_argp = &data->c_arg,
1678                 .rpc_resp = &data->c_res,
1679                 .rpc_cred = data->owner->so_cred,
1680         };
1681         struct rpc_task_setup task_setup_data = {
1682                 .rpc_client = server->client,
1683                 .rpc_message = &msg,
1684                 .callback_ops = &nfs4_open_confirm_ops,
1685                 .callback_data = data,
1686                 .workqueue = nfsiod_workqueue,
1687                 .flags = RPC_TASK_ASYNC,
1688         };
1689         int status;
1690
1691         nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
1692         kref_get(&data->kref);
1693         data->rpc_done = 0;
1694         data->rpc_status = 0;
1695         data->timestamp = jiffies;
1696         task = rpc_run_task(&task_setup_data);
1697         if (IS_ERR(task))
1698                 return PTR_ERR(task);
1699         status = nfs4_wait_for_completion_rpc_task(task);
1700         if (status != 0) {
1701                 data->cancelled = 1;
1702                 smp_wmb();
1703         } else
1704                 status = data->rpc_status;
1705         rpc_put_task(task);
1706         return status;
1707 }
1708
1709 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1710 {
1711         struct nfs4_opendata *data = calldata;
1712         struct nfs4_state_owner *sp = data->owner;
1713         struct nfs_client *clp = sp->so_server->nfs_client;
1714
1715         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1716                 goto out_wait;
1717         /*
1718          * Check if we still need to send an OPEN call, or if we can use
1719          * a delegation instead.
1720          */
1721         if (data->state != NULL) {
1722                 struct nfs_delegation *delegation;
1723
1724                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1725                         goto out_no_action;
1726                 rcu_read_lock();
1727                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1728                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1729                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1730                     can_open_delegated(delegation, data->o_arg.fmode))
1731                         goto unlock_no_action;
1732                 rcu_read_unlock();
1733         }
1734         /* Update client id. */
1735         data->o_arg.clientid = clp->cl_clientid;
1736         switch (data->o_arg.claim) {
1737         case NFS4_OPEN_CLAIM_PREVIOUS:
1738         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1739         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1740                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1741         case NFS4_OPEN_CLAIM_FH:
1742                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1743                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1744         }
1745         data->timestamp = jiffies;
1746         if (nfs4_setup_sequence(data->o_arg.server,
1747                                 &data->o_arg.seq_args,
1748                                 &data->o_res.seq_res,
1749                                 task) != 0)
1750                 nfs_release_seqid(data->o_arg.seqid);
1751
1752         /* Set the create mode (note dependency on the session type) */
1753         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1754         if (data->o_arg.open_flags & O_EXCL) {
1755                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1756                 if (nfs4_has_persistent_session(clp))
1757                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1758                 else if (clp->cl_mvops->minor_version > 0)
1759                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1760         }
1761         return;
1762 unlock_no_action:
1763         rcu_read_unlock();
1764 out_no_action:
1765         task->tk_action = NULL;
1766 out_wait:
1767         nfs4_sequence_done(task, &data->o_res.seq_res);
1768 }
1769
1770 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1771 {
1772         struct nfs4_opendata *data = calldata;
1773
1774         data->rpc_status = task->tk_status;
1775
1776         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1777                 return;
1778
1779         if (task->tk_status == 0) {
1780                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1781                         switch (data->o_res.f_attr->mode & S_IFMT) {
1782                         case S_IFREG:
1783                                 break;
1784                         case S_IFLNK:
1785                                 data->rpc_status = -ELOOP;
1786                                 break;
1787                         case S_IFDIR:
1788                                 data->rpc_status = -EISDIR;
1789                                 break;
1790                         default:
1791                                 data->rpc_status = -ENOTDIR;
1792                         }
1793                 }
1794                 renew_lease(data->o_res.server, data->timestamp);
1795                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1796                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1797         }
1798         data->rpc_done = 1;
1799 }
1800
1801 static void nfs4_open_release(void *calldata)
1802 {
1803         struct nfs4_opendata *data = calldata;
1804         struct nfs4_state *state = NULL;
1805
1806         /* If this request hasn't been cancelled, do nothing */
1807         if (data->cancelled == 0)
1808                 goto out_free;
1809         /* In case of error, no cleanup! */
1810         if (data->rpc_status != 0 || !data->rpc_done)
1811                 goto out_free;
1812         /* In case we need an open_confirm, no cleanup! */
1813         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1814                 goto out_free;
1815         state = nfs4_opendata_to_nfs4_state(data);
1816         if (!IS_ERR(state))
1817                 nfs4_close_state(state, data->o_arg.fmode);
1818 out_free:
1819         nfs4_opendata_put(data);
1820 }
1821
1822 static const struct rpc_call_ops nfs4_open_ops = {
1823         .rpc_call_prepare = nfs4_open_prepare,
1824         .rpc_call_done = nfs4_open_done,
1825         .rpc_release = nfs4_open_release,
1826 };
1827
1828 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1829 {
1830         struct inode *dir = data->dir->d_inode;
1831         struct nfs_server *server = NFS_SERVER(dir);
1832         struct nfs_openargs *o_arg = &data->o_arg;
1833         struct nfs_openres *o_res = &data->o_res;
1834         struct rpc_task *task;
1835         struct rpc_message msg = {
1836                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1837                 .rpc_argp = o_arg,
1838                 .rpc_resp = o_res,
1839                 .rpc_cred = data->owner->so_cred,
1840         };
1841         struct rpc_task_setup task_setup_data = {
1842                 .rpc_client = server->client,
1843                 .rpc_message = &msg,
1844                 .callback_ops = &nfs4_open_ops,
1845                 .callback_data = data,
1846                 .workqueue = nfsiod_workqueue,
1847                 .flags = RPC_TASK_ASYNC,
1848         };
1849         int status;
1850
1851         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1852         kref_get(&data->kref);
1853         data->rpc_done = 0;
1854         data->rpc_status = 0;
1855         data->cancelled = 0;
1856         data->is_recover = 0;
1857         if (isrecover) {
1858                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1859                 data->is_recover = 1;
1860         }
1861         task = rpc_run_task(&task_setup_data);
1862         if (IS_ERR(task))
1863                 return PTR_ERR(task);
1864         status = nfs4_wait_for_completion_rpc_task(task);
1865         if (status != 0) {
1866                 data->cancelled = 1;
1867                 smp_wmb();
1868         } else
1869                 status = data->rpc_status;
1870         rpc_put_task(task);
1871
1872         return status;
1873 }
1874
1875 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1876 {
1877         struct inode *dir = data->dir->d_inode;
1878         struct nfs_openres *o_res = &data->o_res;
1879         int status;
1880
1881         status = nfs4_run_open_task(data, 1);
1882         if (status != 0 || !data->rpc_done)
1883                 return status;
1884
1885         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1886
1887         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1888                 status = _nfs4_proc_open_confirm(data);
1889                 if (status != 0)
1890                         return status;
1891         }
1892
1893         return status;
1894 }
1895
1896 static int nfs4_opendata_access(struct rpc_cred *cred,
1897                                 struct nfs4_opendata *opendata,
1898                                 struct nfs4_state *state, fmode_t fmode,
1899                                 int openflags)
1900 {
1901         struct nfs_access_entry cache;
1902         u32 mask;
1903
1904         /* access call failed or for some reason the server doesn't
1905          * support any access modes -- defer access call until later */
1906         if (opendata->o_res.access_supported == 0)
1907                 return 0;
1908
1909         mask = 0;
1910         /* don't check MAY_WRITE - a newly created file may not have
1911          * write mode bits, but POSIX allows the creating process to write.
1912          * use openflags to check for exec, because fmode won't
1913          * always have FMODE_EXEC set when file open for exec. */
1914         if (openflags & __FMODE_EXEC) {
1915                 /* ONLY check for exec rights */
1916                 mask = MAY_EXEC;
1917         } else if (fmode & FMODE_READ)
1918                 mask = MAY_READ;
1919
1920         cache.cred = cred;
1921         cache.jiffies = jiffies;
1922         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1923         nfs_access_add_cache(state->inode, &cache);
1924
1925         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1926                 return 0;
1927
1928         /* even though OPEN succeeded, access is denied. Close the file */
1929         nfs4_close_state(state, fmode);
1930         return -EACCES;
1931 }
1932
1933 /*
1934  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1935  */
1936 static int _nfs4_proc_open(struct nfs4_opendata *data)
1937 {
1938         struct inode *dir = data->dir->d_inode;
1939         struct nfs_server *server = NFS_SERVER(dir);
1940         struct nfs_openargs *o_arg = &data->o_arg;
1941         struct nfs_openres *o_res = &data->o_res;
1942         int status;
1943
1944         status = nfs4_run_open_task(data, 0);
1945         if (!data->rpc_done)
1946                 return status;
1947         if (status != 0) {
1948                 if (status == -NFS4ERR_BADNAME &&
1949                                 !(o_arg->open_flags & O_CREAT))
1950                         return -ENOENT;
1951                 return status;
1952         }
1953
1954         nfs_fattr_map_and_free_names(server, &data->f_attr);
1955
1956         if (o_arg->open_flags & O_CREAT) {
1957                 update_changeattr(dir, &o_res->cinfo);
1958                 if (o_arg->open_flags & O_EXCL)
1959                         data->file_created = 1;
1960                 else if (o_res->cinfo.before != o_res->cinfo.after)
1961                         data->file_created = 1;
1962         }
1963         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1964                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1965         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1966                 status = _nfs4_proc_open_confirm(data);
1967                 if (status != 0)
1968                         return status;
1969         }
1970         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1971                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1972         return 0;
1973 }
1974
1975 static int nfs4_recover_expired_lease(struct nfs_server *server)
1976 {
1977         return nfs4_client_recover_expired_lease(server->nfs_client);
1978 }
1979
1980 /*
1981  * OPEN_EXPIRED:
1982  *      reclaim state on the server after a network partition.
1983  *      Assumes caller holds the appropriate lock
1984  */
1985 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1986 {
1987         struct nfs4_opendata *opendata;
1988         int ret;
1989
1990         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1991                         NFS4_OPEN_CLAIM_FH);
1992         if (IS_ERR(opendata))
1993                 return PTR_ERR(opendata);
1994         ret = nfs4_open_recover(opendata, state);
1995         if (ret == -ESTALE)
1996                 d_drop(ctx->dentry);
1997         nfs4_opendata_put(opendata);
1998         return ret;
1999 }
2000
2001 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2002 {
2003         struct nfs_server *server = NFS_SERVER(state->inode);
2004         struct nfs4_exception exception = { };
2005         int err;
2006
2007         do {
2008                 err = _nfs4_open_expired(ctx, state);
2009                 trace_nfs4_open_expired(ctx, 0, err);
2010                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2011                         continue;
2012                 switch (err) {
2013                 default:
2014                         goto out;
2015                 case -NFS4ERR_GRACE:
2016                 case -NFS4ERR_DELAY:
2017                         nfs4_handle_exception(server, err, &exception);
2018                         err = 0;
2019                 }
2020         } while (exception.retry);
2021 out:
2022         return err;
2023 }
2024
2025 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2026 {
2027         struct nfs_open_context *ctx;
2028         int ret;
2029
2030         ctx = nfs4_state_find_open_context(state);
2031         if (IS_ERR(ctx))
2032                 return -EAGAIN;
2033         ret = nfs4_do_open_expired(ctx, state);
2034         put_nfs_open_context(ctx);
2035         return ret;
2036 }
2037
2038 #if defined(CONFIG_NFS_V4_1)
2039 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2040 {
2041         struct nfs_server *server = NFS_SERVER(state->inode);
2042         nfs4_stateid *stateid = &state->stateid;
2043         struct nfs_delegation *delegation;
2044         struct rpc_cred *cred = NULL;
2045         int status = -NFS4ERR_BAD_STATEID;
2046
2047         /* If a state reset has been done, test_stateid is unneeded */
2048         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2049                 return;
2050
2051         /* Get the delegation credential for use by test/free_stateid */
2052         rcu_read_lock();
2053         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2054         if (delegation != NULL &&
2055             nfs4_stateid_match(&delegation->stateid, stateid)) {
2056                 cred = get_rpccred(delegation->cred);
2057                 rcu_read_unlock();
2058                 status = nfs41_test_stateid(server, stateid, cred);
2059                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2060         } else
2061                 rcu_read_unlock();
2062
2063         if (status != NFS_OK) {
2064                 /* Free the stateid unless the server explicitly
2065                  * informs us the stateid is unrecognized. */
2066                 if (status != -NFS4ERR_BAD_STATEID)
2067                         nfs41_free_stateid(server, stateid, cred);
2068                 nfs_remove_bad_delegation(state->inode);
2069
2070                 write_seqlock(&state->seqlock);
2071                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2072                 write_sequnlock(&state->seqlock);
2073                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2074         }
2075
2076         if (cred != NULL)
2077                 put_rpccred(cred);
2078 }
2079
2080 /**
2081  * nfs41_check_open_stateid - possibly free an open stateid
2082  *
2083  * @state: NFSv4 state for an inode
2084  *
2085  * Returns NFS_OK if recovery for this stateid is now finished.
2086  * Otherwise a negative NFS4ERR value is returned.
2087  */
2088 static int nfs41_check_open_stateid(struct nfs4_state *state)
2089 {
2090         struct nfs_server *server = NFS_SERVER(state->inode);
2091         nfs4_stateid *stateid = &state->open_stateid;
2092         struct rpc_cred *cred = state->owner->so_cred;
2093         int status;
2094
2095         /* If a state reset has been done, test_stateid is unneeded */
2096         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2097             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2098             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2099                 return -NFS4ERR_BAD_STATEID;
2100
2101         status = nfs41_test_stateid(server, stateid, cred);
2102         trace_nfs4_test_open_stateid(state, NULL, status);
2103         if (status != NFS_OK) {
2104                 /* Free the stateid unless the server explicitly
2105                  * informs us the stateid is unrecognized. */
2106                 if (status != -NFS4ERR_BAD_STATEID)
2107                         nfs41_free_stateid(server, stateid, cred);
2108
2109                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2110                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2111                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2112                 clear_bit(NFS_OPEN_STATE, &state->flags);
2113         }
2114         return status;
2115 }
2116
2117 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2118 {
2119         int status;
2120
2121         nfs41_clear_delegation_stateid(state);
2122         status = nfs41_check_open_stateid(state);
2123         if (status != NFS_OK)
2124                 status = nfs4_open_expired(sp, state);
2125         return status;
2126 }
2127 #endif
2128
2129 /*
2130  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2131  * fields corresponding to attributes that were used to store the verifier.
2132  * Make sure we clobber those fields in the later setattr call
2133  */
2134 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2135 {
2136         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2137             !(sattr->ia_valid & ATTR_ATIME_SET))
2138                 sattr->ia_valid |= ATTR_ATIME;
2139
2140         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2141             !(sattr->ia_valid & ATTR_MTIME_SET))
2142                 sattr->ia_valid |= ATTR_MTIME;
2143 }
2144
2145 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2146                 fmode_t fmode,
2147                 int flags,
2148                 struct nfs_open_context *ctx)
2149 {
2150         struct nfs4_state_owner *sp = opendata->owner;
2151         struct nfs_server *server = sp->so_server;
2152         struct dentry *dentry;
2153         struct nfs4_state *state;
2154         unsigned int seq;
2155         int ret;
2156
2157         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2158
2159         ret = _nfs4_proc_open(opendata);
2160         if (ret != 0)
2161                 goto out;
2162
2163         state = nfs4_opendata_to_nfs4_state(opendata);
2164         ret = PTR_ERR(state);
2165         if (IS_ERR(state))
2166                 goto out;
2167         if (server->caps & NFS_CAP_POSIX_LOCK)
2168                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2169
2170         dentry = opendata->dentry;
2171         if (dentry->d_inode == NULL) {
2172                 /* FIXME: Is this d_drop() ever needed? */
2173                 d_drop(dentry);
2174                 dentry = d_add_unique(dentry, igrab(state->inode));
2175                 if (dentry == NULL) {
2176                         dentry = opendata->dentry;
2177                 } else if (dentry != ctx->dentry) {
2178                         dput(ctx->dentry);
2179                         ctx->dentry = dget(dentry);
2180                 }
2181                 nfs_set_verifier(dentry,
2182                                 nfs_save_change_attribute(opendata->dir->d_inode));
2183         }
2184
2185         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2186         if (ret != 0)
2187                 goto out;
2188
2189         ctx->state = state;
2190         if (dentry->d_inode == state->inode) {
2191                 nfs_inode_attach_open_context(ctx);
2192                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2193                         nfs4_schedule_stateid_recovery(server, state);
2194         }
2195 out:
2196         return ret;
2197 }
2198
2199 /*
2200  * Returns a referenced nfs4_state
2201  */
2202 static int _nfs4_do_open(struct inode *dir,
2203                         struct nfs_open_context *ctx,
2204                         int flags,
2205                         struct iattr *sattr,
2206                         struct nfs4_label *label,
2207                         int *opened)
2208 {
2209         struct nfs4_state_owner  *sp;
2210         struct nfs4_state     *state = NULL;
2211         struct nfs_server       *server = NFS_SERVER(dir);
2212         struct nfs4_opendata *opendata;
2213         struct dentry *dentry = ctx->dentry;
2214         struct rpc_cred *cred = ctx->cred;
2215         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2216         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2217         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2218         struct nfs4_label *olabel = NULL;
2219         int status;
2220
2221         /* Protect against reboot recovery conflicts */
2222         status = -ENOMEM;
2223         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2224         if (sp == NULL) {
2225                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2226                 goto out_err;
2227         }
2228         status = nfs4_recover_expired_lease(server);
2229         if (status != 0)
2230                 goto err_put_state_owner;
2231         if (dentry->d_inode != NULL)
2232                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2233         status = -ENOMEM;
2234         if (dentry->d_inode)
2235                 claim = NFS4_OPEN_CLAIM_FH;
2236         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2237                         label, claim, GFP_KERNEL);
2238         if (opendata == NULL)
2239                 goto err_put_state_owner;
2240
2241         if (label) {
2242                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2243                 if (IS_ERR(olabel)) {
2244                         status = PTR_ERR(olabel);
2245                         goto err_opendata_put;
2246                 }
2247         }
2248
2249         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2250                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2251                 if (!opendata->f_attr.mdsthreshold)
2252                         goto err_free_label;
2253                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2254         }
2255         if (dentry->d_inode != NULL)
2256                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2257
2258         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2259         if (status != 0)
2260                 goto err_free_label;
2261         state = ctx->state;
2262
2263         if ((opendata->o_arg.open_flags & O_EXCL) &&
2264             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2265                 nfs4_exclusive_attrset(opendata, sattr);
2266
2267                 nfs_fattr_init(opendata->o_res.f_attr);
2268                 status = nfs4_do_setattr(state->inode, cred,
2269                                 opendata->o_res.f_attr, sattr,
2270                                 state, label, olabel);
2271                 if (status == 0) {
2272                         nfs_setattr_update_inode(state->inode, sattr);
2273                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2274                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2275                 }
2276         }
2277         if (opendata->file_created)
2278                 *opened |= FILE_CREATED;
2279
2280         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2281                 *ctx_th = opendata->f_attr.mdsthreshold;
2282         else
2283                 kfree(opendata->f_attr.mdsthreshold);
2284         opendata->f_attr.mdsthreshold = NULL;
2285
2286         nfs4_label_free(olabel);
2287
2288         nfs4_opendata_put(opendata);
2289         nfs4_put_state_owner(sp);
2290         return 0;
2291 err_free_label:
2292         nfs4_label_free(olabel);
2293 err_opendata_put:
2294         kfree(opendata->f_attr.mdsthreshold);
2295         nfs4_opendata_put(opendata);
2296 err_put_state_owner:
2297         nfs4_put_state_owner(sp);
2298 out_err:
2299         return status;
2300 }
2301
2302
2303 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2304                                         struct nfs_open_context *ctx,
2305                                         int flags,
2306                                         struct iattr *sattr,
2307                                         struct nfs4_label *label,
2308                                         int *opened)
2309 {
2310         struct nfs_server *server = NFS_SERVER(dir);
2311         struct nfs4_exception exception = { };
2312         struct nfs4_state *res;
2313         int status;
2314
2315         do {
2316                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2317                 res = ctx->state;
2318                 trace_nfs4_open_file(ctx, flags, status);
2319                 if (status == 0)
2320                         break;
2321                 /* NOTE: BAD_SEQID means the server and client disagree about the
2322                  * book-keeping w.r.t. state-changing operations
2323                  * (OPEN/CLOSE/LOCK/LOCKU...)
2324                  * It is actually a sign of a bug on the client or on the server.
2325                  *
2326                  * If we receive a BAD_SEQID error in the particular case of
2327                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2328                  * have unhashed the old state_owner for us, and that we can
2329                  * therefore safely retry using a new one. We should still warn
2330                  * the user though...
2331                  */
2332                 if (status == -NFS4ERR_BAD_SEQID) {
2333                         pr_warn_ratelimited("NFS: v4 server %s "
2334                                         " returned a bad sequence-id error!\n",
2335                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2336                         exception.retry = 1;
2337                         continue;
2338                 }
2339                 /*
2340                  * BAD_STATEID on OPEN means that the server cancelled our
2341                  * state before it received the OPEN_CONFIRM.
2342                  * Recover by retrying the request as per the discussion
2343                  * on Page 181 of RFC3530.
2344                  */
2345                 if (status == -NFS4ERR_BAD_STATEID) {
2346                         exception.retry = 1;
2347                         continue;
2348                 }
2349                 if (status == -EAGAIN) {
2350                         /* We must have found a delegation */
2351                         exception.retry = 1;
2352                         continue;
2353                 }
2354                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2355                         continue;
2356                 res = ERR_PTR(nfs4_handle_exception(server,
2357                                         status, &exception));
2358         } while (exception.retry);
2359         return res;
2360 }
2361
2362 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2363                             struct nfs_fattr *fattr, struct iattr *sattr,
2364                             struct nfs4_state *state, struct nfs4_label *ilabel,
2365                             struct nfs4_label *olabel)
2366 {
2367         struct nfs_server *server = NFS_SERVER(inode);
2368         struct nfs_setattrargs  arg = {
2369                 .fh             = NFS_FH(inode),
2370                 .iap            = sattr,
2371                 .server         = server,
2372                 .bitmask = server->attr_bitmask,
2373                 .label          = ilabel,
2374         };
2375         struct nfs_setattrres  res = {
2376                 .fattr          = fattr,
2377                 .label          = olabel,
2378                 .server         = server,
2379         };
2380         struct rpc_message msg = {
2381                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2382                 .rpc_argp       = &arg,
2383                 .rpc_resp       = &res,
2384                 .rpc_cred       = cred,
2385         };
2386         unsigned long timestamp = jiffies;
2387         fmode_t fmode;
2388         bool truncate;
2389         int status;
2390
2391         arg.bitmask = nfs4_bitmask(server, ilabel);
2392         if (ilabel)
2393                 arg.bitmask = nfs4_bitmask(server, olabel);
2394
2395         nfs_fattr_init(fattr);
2396
2397         /* Servers should only apply open mode checks for file size changes */
2398         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2399         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2400
2401         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2402                 /* Use that stateid */
2403         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2404                 struct nfs_lockowner lockowner = {
2405                         .l_owner = current->files,
2406                         .l_pid = current->tgid,
2407                 };
2408                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2409                                 &lockowner);
2410         } else
2411                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2412
2413         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2414         if (status == 0 && state != NULL)
2415                 renew_lease(server, timestamp);
2416         return status;
2417 }
2418
2419 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2420                            struct nfs_fattr *fattr, struct iattr *sattr,
2421                            struct nfs4_state *state, struct nfs4_label *ilabel,
2422                            struct nfs4_label *olabel)
2423 {
2424         struct nfs_server *server = NFS_SERVER(inode);
2425         struct nfs4_exception exception = {
2426                 .state = state,
2427                 .inode = inode,
2428         };
2429         int err;
2430         do {
2431                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2432                 trace_nfs4_setattr(inode, err);
2433                 switch (err) {
2434                 case -NFS4ERR_OPENMODE:
2435                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2436                                 pr_warn_once("NFSv4: server %s is incorrectly "
2437                                                 "applying open mode checks to "
2438                                                 "a SETATTR that is not "
2439                                                 "changing file size.\n",
2440                                                 server->nfs_client->cl_hostname);
2441                         }
2442                         if (state && !(state->state & FMODE_WRITE)) {
2443                                 err = -EBADF;
2444                                 if (sattr->ia_valid & ATTR_OPEN)
2445                                         err = -EACCES;
2446                                 goto out;
2447                         }
2448                 }
2449                 err = nfs4_handle_exception(server, err, &exception);
2450         } while (exception.retry);
2451 out:
2452         return err;
2453 }
2454
2455 struct nfs4_closedata {
2456         struct inode *inode;
2457         struct nfs4_state *state;
2458         struct nfs_closeargs arg;
2459         struct nfs_closeres res;
2460         struct nfs_fattr fattr;
2461         unsigned long timestamp;
2462         bool roc;
2463         u32 roc_barrier;
2464 };
2465
2466 static void nfs4_free_closedata(void *data)
2467 {
2468         struct nfs4_closedata *calldata = data;
2469         struct nfs4_state_owner *sp = calldata->state->owner;
2470         struct super_block *sb = calldata->state->inode->i_sb;
2471
2472         if (calldata->roc)
2473                 pnfs_roc_release(calldata->state->inode);
2474         nfs4_put_open_state(calldata->state);
2475         nfs_free_seqid(calldata->arg.seqid);
2476         nfs4_put_state_owner(sp);
2477         nfs_sb_deactive(sb);
2478         kfree(calldata);
2479 }
2480
2481 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2482                 fmode_t fmode)
2483 {
2484         spin_lock(&state->owner->so_lock);
2485         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2486         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2487         case FMODE_WRITE:
2488                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2489                 break;
2490         case FMODE_READ:
2491                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2492                 break;
2493         case 0:
2494                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2495                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2496                 clear_bit(NFS_OPEN_STATE, &state->flags);
2497         }
2498         spin_unlock(&state->owner->so_lock);
2499 }
2500
2501 static void nfs4_close_done(struct rpc_task *task, void *data)
2502 {
2503         struct nfs4_closedata *calldata = data;
2504         struct nfs4_state *state = calldata->state;
2505         struct nfs_server *server = NFS_SERVER(calldata->inode);
2506
2507         dprintk("%s: begin!\n", __func__);
2508         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2509                 return;
2510         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2511         /* hmm. we are done with the inode, and in the process of freeing
2512          * the state_owner. we keep this around to process errors
2513          */
2514         switch (task->tk_status) {
2515                 case 0:
2516                         if (calldata->roc)
2517                                 pnfs_roc_set_barrier(state->inode,
2518                                                      calldata->roc_barrier);
2519                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2520                         renew_lease(server, calldata->timestamp);
2521                         nfs4_close_clear_stateid_flags(state,
2522                                         calldata->arg.fmode);
2523                         break;
2524                 case -NFS4ERR_STALE_STATEID:
2525                 case -NFS4ERR_OLD_STATEID:
2526                 case -NFS4ERR_BAD_STATEID:
2527                 case -NFS4ERR_EXPIRED:
2528                         if (calldata->arg.fmode == 0)
2529                                 break;
2530                 default:
2531                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2532                                 rpc_restart_call_prepare(task);
2533         }
2534         nfs_release_seqid(calldata->arg.seqid);
2535         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2536         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2537 }
2538
2539 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2540 {
2541         struct nfs4_closedata *calldata = data;
2542         struct nfs4_state *state = calldata->state;
2543         struct inode *inode = calldata->inode;
2544         int call_close = 0;
2545
2546         dprintk("%s: begin!\n", __func__);
2547         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2548                 goto out_wait;
2549
2550         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2551         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2552         spin_lock(&state->owner->so_lock);
2553         /* Calculate the change in open mode */
2554         if (state->n_rdwr == 0) {
2555                 if (state->n_rdonly == 0) {
2556                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2557                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2558                         calldata->arg.fmode &= ~FMODE_READ;
2559                 }
2560                 if (state->n_wronly == 0) {
2561                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2562                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2563                         calldata->arg.fmode &= ~FMODE_WRITE;
2564                 }
2565         }
2566         if (!nfs4_valid_open_stateid(state))
2567                 call_close = 0;
2568         spin_unlock(&state->owner->so_lock);
2569
2570         if (!call_close) {
2571                 /* Note: exit _without_ calling nfs4_close_done */
2572                 goto out_no_action;
2573         }
2574
2575         if (calldata->arg.fmode == 0) {
2576                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2577                 if (calldata->roc &&
2578                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2579                         nfs_release_seqid(calldata->arg.seqid);
2580                         goto out_wait;
2581                     }
2582         }
2583
2584         nfs_fattr_init(calldata->res.fattr);
2585         calldata->timestamp = jiffies;
2586         if (nfs4_setup_sequence(NFS_SERVER(inode),
2587                                 &calldata->arg.seq_args,
2588                                 &calldata->res.seq_res,
2589                                 task) != 0)
2590                 nfs_release_seqid(calldata->arg.seqid);
2591         dprintk("%s: done!\n", __func__);
2592         return;
2593 out_no_action:
2594         task->tk_action = NULL;
2595 out_wait:
2596         nfs4_sequence_done(task, &calldata->res.seq_res);
2597 }
2598
2599 static const struct rpc_call_ops nfs4_close_ops = {
2600         .rpc_call_prepare = nfs4_close_prepare,
2601         .rpc_call_done = nfs4_close_done,
2602         .rpc_release = nfs4_free_closedata,
2603 };
2604
2605 /*
2606  * It is possible for data to be read/written from a mem-mapped file
2607  * after the sys_close call (which hits the vfs layer as a flush).
2608  * This means that we can't safely call nfsv4 close on a file until
2609  * the inode is cleared. This in turn means that we are not good
2610  * NFSv4 citizens - we do not indicate to the server to update the file's
2611  * share state even when we are done with one of the three share
2612  * stateid's in the inode.
2613  *
2614  * NOTE: Caller must be holding the sp->so_owner semaphore!
2615  */
2616 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2617 {
2618         struct nfs_server *server = NFS_SERVER(state->inode);
2619         struct nfs4_closedata *calldata;
2620         struct nfs4_state_owner *sp = state->owner;
2621         struct rpc_task *task;
2622         struct rpc_message msg = {
2623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2624                 .rpc_cred = state->owner->so_cred,
2625         };
2626         struct rpc_task_setup task_setup_data = {
2627                 .rpc_client = server->client,
2628                 .rpc_message = &msg,
2629                 .callback_ops = &nfs4_close_ops,
2630                 .workqueue = nfsiod_workqueue,
2631                 .flags = RPC_TASK_ASYNC,
2632         };
2633         int status = -ENOMEM;
2634
2635         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2636                 &task_setup_data.rpc_client, &msg);
2637
2638         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2639         if (calldata == NULL)
2640                 goto out;
2641         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2642         calldata->inode = state->inode;
2643         calldata->state = state;
2644         calldata->arg.fh = NFS_FH(state->inode);
2645         calldata->arg.stateid = &state->open_stateid;
2646         /* Serialization for the sequence id */
2647         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2648         if (calldata->arg.seqid == NULL)
2649                 goto out_free_calldata;
2650         calldata->arg.fmode = 0;
2651         calldata->arg.bitmask = server->cache_consistency_bitmask;
2652         calldata->res.fattr = &calldata->fattr;
2653         calldata->res.seqid = calldata->arg.seqid;
2654         calldata->res.server = server;
2655         calldata->roc = pnfs_roc(state->inode);
2656         nfs_sb_active(calldata->inode->i_sb);
2657
2658         msg.rpc_argp = &calldata->arg;
2659         msg.rpc_resp = &calldata->res;
2660         task_setup_data.callback_data = calldata;
2661         task = rpc_run_task(&task_setup_data);
2662         if (IS_ERR(task))
2663                 return PTR_ERR(task);
2664         status = 0;
2665         if (wait)
2666                 status = rpc_wait_for_completion_task(task);
2667         rpc_put_task(task);
2668         return status;
2669 out_free_calldata:
2670         kfree(calldata);
2671 out:
2672         nfs4_put_open_state(state);
2673         nfs4_put_state_owner(sp);
2674         return status;
2675 }
2676
2677 static struct inode *
2678 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2679                 int open_flags, struct iattr *attr, int *opened)
2680 {
2681         struct nfs4_state *state;
2682         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2683
2684         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2685
2686         /* Protect against concurrent sillydeletes */
2687         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2688
2689         nfs4_label_release_security(label);
2690
2691         if (IS_ERR(state))
2692                 return ERR_CAST(state);
2693         return state->inode;
2694 }
2695
2696 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2697 {
2698         if (ctx->state == NULL)
2699                 return;
2700         if (is_sync)
2701                 nfs4_close_sync(ctx->state, ctx->mode);
2702         else
2703                 nfs4_close_state(ctx->state, ctx->mode);
2704 }
2705
2706 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2707 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2708 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_CHANGE_SECURITY_LABEL - 1UL)
2709
2710 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2711 {
2712         struct nfs4_server_caps_arg args = {
2713                 .fhandle = fhandle,
2714         };
2715         struct nfs4_server_caps_res res = {};
2716         struct rpc_message msg = {
2717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2718                 .rpc_argp = &args,
2719                 .rpc_resp = &res,
2720         };
2721         int status;
2722
2723         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2724         if (status == 0) {
2725                 /* Sanity check the server answers */
2726                 switch (server->nfs_client->cl_minorversion) {
2727                 case 0:
2728                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2729                         res.attr_bitmask[2] = 0;
2730                         break;
2731                 case 1:
2732                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2733                         break;
2734                 case 2:
2735                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2736                 }
2737                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2738                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2739                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2740                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2741                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2742                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2743                                 NFS_CAP_SECURITY_LABEL);
2744                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2745                         server->caps |= NFS_CAP_ACLS;
2746                 if (res.has_links != 0)
2747                         server->caps |= NFS_CAP_HARDLINKS;
2748                 if (res.has_symlinks != 0)
2749                         server->caps |= NFS_CAP_SYMLINKS;
2750                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2751                         server->caps |= NFS_CAP_FILEID;
2752                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2753                         server->caps |= NFS_CAP_MODE;
2754                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2755                         server->caps |= NFS_CAP_NLINK;
2756                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2757                         server->caps |= NFS_CAP_OWNER;
2758                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2759                         server->caps |= NFS_CAP_OWNER_GROUP;
2760                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2761                         server->caps |= NFS_CAP_ATIME;
2762                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2763                         server->caps |= NFS_CAP_CTIME;
2764                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2765                         server->caps |= NFS_CAP_MTIME;
2766 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2767                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2768                         server->caps |= NFS_CAP_SECURITY_LABEL;
2769 #endif
2770                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2771                                 sizeof(server->attr_bitmask));
2772                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2773
2774                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2775                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2776                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2777                 server->cache_consistency_bitmask[2] = 0;
2778                 server->acl_bitmask = res.acl_bitmask;
2779                 server->fh_expire_type = res.fh_expire_type;
2780         }
2781
2782         return status;
2783 }
2784
2785 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2786 {
2787         struct nfs4_exception exception = { };
2788         int err;
2789         do {
2790                 err = nfs4_handle_exception(server,
2791                                 _nfs4_server_capabilities(server, fhandle),
2792                                 &exception);
2793         } while (exception.retry);
2794         return err;
2795 }
2796
2797 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2798                 struct nfs_fsinfo *info)
2799 {
2800         u32 bitmask[3];
2801         struct nfs4_lookup_root_arg args = {
2802                 .bitmask = bitmask,
2803         };
2804         struct nfs4_lookup_res res = {
2805                 .server = server,
2806                 .fattr = info->fattr,
2807                 .fh = fhandle,
2808         };
2809         struct rpc_message msg = {
2810                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2811                 .rpc_argp = &args,
2812                 .rpc_resp = &res,
2813         };
2814
2815         bitmask[0] = nfs4_fattr_bitmap[0];
2816         bitmask[1] = nfs4_fattr_bitmap[1];
2817         /*
2818          * Process the label in the upcoming getfattr
2819          */
2820         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2821
2822         nfs_fattr_init(info->fattr);
2823         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2824 }
2825
2826 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2827                 struct nfs_fsinfo *info)
2828 {
2829         struct nfs4_exception exception = { };
2830         int err;
2831         do {
2832                 err = _nfs4_lookup_root(server, fhandle, info);
2833                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2834                 switch (err) {
2835                 case 0:
2836                 case -NFS4ERR_WRONGSEC:
2837                         goto out;
2838                 default:
2839                         err = nfs4_handle_exception(server, err, &exception);
2840                 }
2841         } while (exception.retry);
2842 out:
2843         return err;
2844 }
2845
2846 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2847                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2848 {
2849         struct rpc_auth_create_args auth_args = {
2850                 .pseudoflavor = flavor,
2851         };
2852         struct rpc_auth *auth;
2853         int ret;
2854
2855         auth = rpcauth_create(&auth_args, server->client);
2856         if (IS_ERR(auth)) {
2857                 ret = -EACCES;
2858                 goto out;
2859         }
2860         ret = nfs4_lookup_root(server, fhandle, info);
2861 out:
2862         return ret;
2863 }
2864
2865 /*
2866  * Retry pseudoroot lookup with various security flavors.  We do this when:
2867  *
2868  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2869  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2870  *
2871  * Returns zero on success, or a negative NFS4ERR value, or a
2872  * negative errno value.
2873  */
2874 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2875                               struct nfs_fsinfo *info)
2876 {
2877         /* Per 3530bis 15.33.5 */
2878         static const rpc_authflavor_t flav_array[] = {
2879                 RPC_AUTH_GSS_KRB5P,
2880                 RPC_AUTH_GSS_KRB5I,
2881                 RPC_AUTH_GSS_KRB5,
2882                 RPC_AUTH_UNIX,                  /* courtesy */
2883                 RPC_AUTH_NULL,
2884         };
2885         int status = -EPERM;
2886         size_t i;
2887
2888         if (server->auth_info.flavor_len > 0) {
2889                 /* try each flavor specified by user */
2890                 for (i = 0; i < server->auth_info.flavor_len; i++) {
2891                         status = nfs4_lookup_root_sec(server, fhandle, info,
2892                                                 server->auth_info.flavors[i]);
2893                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2894                                 continue;
2895                         break;
2896                 }
2897         } else {
2898                 /* no flavors specified by user, try default list */
2899                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2900                         status = nfs4_lookup_root_sec(server, fhandle, info,
2901                                                       flav_array[i]);
2902                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2903                                 continue;
2904                         break;
2905                 }
2906         }
2907
2908         /*
2909          * -EACCESS could mean that the user doesn't have correct permissions
2910          * to access the mount.  It could also mean that we tried to mount
2911          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2912          * existing mount programs don't handle -EACCES very well so it should
2913          * be mapped to -EPERM instead.
2914          */
2915         if (status == -EACCES)
2916                 status = -EPERM;
2917         return status;
2918 }
2919
2920 static int nfs4_do_find_root_sec(struct nfs_server *server,
2921                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2922 {
2923         int mv = server->nfs_client->cl_minorversion;
2924         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2925 }
2926
2927 /**
2928  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2929  * @server: initialized nfs_server handle
2930  * @fhandle: we fill in the pseudo-fs root file handle
2931  * @info: we fill in an FSINFO struct
2932  * @auth_probe: probe the auth flavours
2933  *
2934  * Returns zero on success, or a negative errno.
2935  */
2936 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2937                          struct nfs_fsinfo *info,
2938                          bool auth_probe)
2939 {
2940         int status;
2941
2942         switch (auth_probe) {
2943         case false:
2944                 status = nfs4_lookup_root(server, fhandle, info);
2945                 if (status != -NFS4ERR_WRONGSEC)
2946                         break;
2947         default:
2948                 status = nfs4_do_find_root_sec(server, fhandle, info);
2949         }
2950
2951         if (status == 0)
2952                 status = nfs4_server_capabilities(server, fhandle);
2953         if (status == 0)
2954                 status = nfs4_do_fsinfo(server, fhandle, info);
2955
2956         return nfs4_map_errors(status);
2957 }
2958
2959 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2960                               struct nfs_fsinfo *info)
2961 {
2962         int error;
2963         struct nfs_fattr *fattr = info->fattr;
2964         struct nfs4_label *label = NULL;
2965
2966         error = nfs4_server_capabilities(server, mntfh);
2967         if (error < 0) {
2968                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2969                 return error;
2970         }
2971
2972         label = nfs4_label_alloc(server, GFP_KERNEL);
2973         if (IS_ERR(label))
2974                 return PTR_ERR(label);
2975
2976         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2977         if (error < 0) {
2978                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2979                 goto err_free_label;
2980         }
2981
2982         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2983             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2984                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2985
2986 err_free_label:
2987         nfs4_label_free(label);
2988
2989         return error;
2990 }
2991
2992 /*
2993  * Get locations and (maybe) other attributes of a referral.
2994  * Note that we'll actually follow the referral later when
2995  * we detect fsid mismatch in inode revalidation
2996  */
2997 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2998                              const struct qstr *name, struct nfs_fattr *fattr,
2999                              struct nfs_fh *fhandle)
3000 {
3001         int status = -ENOMEM;
3002         struct page *page = NULL;
3003         struct nfs4_fs_locations *locations = NULL;
3004
3005         page = alloc_page(GFP_KERNEL);
3006         if (page == NULL)
3007                 goto out;
3008         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3009         if (locations == NULL)
3010                 goto out;
3011
3012         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3013         if (status != 0)
3014                 goto out;
3015
3016         /*
3017          * If the fsid didn't change, this is a migration event, not a
3018          * referral.  Cause us to drop into the exception handler, which
3019          * will kick off migration recovery.
3020          */
3021         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3022                 dprintk("%s: server did not return a different fsid for"
3023                         " a referral at %s\n", __func__, name->name);
3024                 status = -NFS4ERR_MOVED;
3025                 goto out;
3026         }
3027         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3028         nfs_fixup_referral_attributes(&locations->fattr);
3029
3030         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3031         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3032         memset(fhandle, 0, sizeof(struct nfs_fh));
3033 out:
3034         if (page)
3035                 __free_page(page);
3036         kfree(locations);
3037         return status;
3038 }
3039
3040 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3041                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3042 {
3043         struct nfs4_getattr_arg args = {
3044                 .fh = fhandle,
3045                 .bitmask = server->attr_bitmask,
3046         };
3047         struct nfs4_getattr_res res = {
3048                 .fattr = fattr,
3049                 .label = label,
3050                 .server = server,
3051         };
3052         struct rpc_message msg = {
3053                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3054                 .rpc_argp = &args,
3055                 .rpc_resp = &res,
3056         };
3057
3058         args.bitmask = nfs4_bitmask(server, label);
3059
3060         nfs_fattr_init(fattr);
3061         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3062 }
3063
3064 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3065                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3066 {
3067         struct nfs4_exception exception = { };
3068         int err;
3069         do {
3070                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3071                 trace_nfs4_getattr(server, fhandle, fattr, err);
3072                 err = nfs4_handle_exception(server, err,
3073                                 &exception);
3074         } while (exception.retry);
3075         return err;
3076 }
3077
3078 /*
3079  * The file is not closed if it is opened due to the a request to change
3080  * the size of the file. The open call will not be needed once the
3081  * VFS layer lookup-intents are implemented.
3082  *
3083  * Close is called when the inode is destroyed.
3084  * If we haven't opened the file for O_WRONLY, we
3085  * need to in the size_change case to obtain a stateid.
3086  *
3087  * Got race?
3088  * Because OPEN is always done by name in nfsv4, it is
3089  * possible that we opened a different file by the same
3090  * name.  We can recognize this race condition, but we
3091  * can't do anything about it besides returning an error.
3092  *
3093  * This will be fixed with VFS changes (lookup-intent).
3094  */
3095 static int
3096 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3097                   struct iattr *sattr)
3098 {
3099         struct inode *inode = dentry->d_inode;
3100         struct rpc_cred *cred = NULL;
3101         struct nfs4_state *state = NULL;
3102         struct nfs4_label *label = NULL;
3103         int status;
3104
3105         if (pnfs_ld_layoutret_on_setattr(inode))
3106                 pnfs_commit_and_return_layout(inode);
3107
3108         nfs_fattr_init(fattr);
3109
3110         /* Deal with open(O_TRUNC) */
3111         if (sattr->ia_valid & ATTR_OPEN)
3112                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3113
3114         /* Optimization: if the end result is no change, don't RPC */
3115         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3116                 return 0;
3117
3118         /* Search for an existing open(O_WRITE) file */
3119         if (sattr->ia_valid & ATTR_FILE) {
3120                 struct nfs_open_context *ctx;
3121
3122                 ctx = nfs_file_open_context(sattr->ia_file);
3123                 if (ctx) {
3124                         cred = ctx->cred;
3125                         state = ctx->state;
3126                 }
3127         }
3128
3129         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3130         if (IS_ERR(label))
3131                 return PTR_ERR(label);
3132
3133         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3134         if (status == 0) {
3135                 nfs_setattr_update_inode(inode, sattr);
3136                 nfs_setsecurity(inode, fattr, label);
3137         }
3138         nfs4_label_free(label);
3139         return status;
3140 }
3141
3142 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3143                 const struct qstr *name, struct nfs_fh *fhandle,
3144                 struct nfs_fattr *fattr, struct nfs4_label *label)
3145 {
3146         struct nfs_server *server = NFS_SERVER(dir);
3147         int                    status;
3148         struct nfs4_lookup_arg args = {
3149                 .bitmask = server->attr_bitmask,
3150                 .dir_fh = NFS_FH(dir),
3151                 .name = name,
3152         };
3153         struct nfs4_lookup_res res = {
3154                 .server = server,
3155                 .fattr = fattr,
3156                 .label = label,
3157                 .fh = fhandle,
3158         };
3159         struct rpc_message msg = {
3160                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3161                 .rpc_argp = &args,
3162                 .rpc_resp = &res,
3163         };
3164
3165         args.bitmask = nfs4_bitmask(server, label);
3166
3167         nfs_fattr_init(fattr);
3168
3169         dprintk("NFS call  lookup %s\n", name->name);
3170         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3171         dprintk("NFS reply lookup: %d\n", status);
3172         return status;
3173 }
3174
3175 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3176 {
3177         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3178                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3179         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3180         fattr->nlink = 2;
3181 }
3182
3183 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3184                                    struct qstr *name, struct nfs_fh *fhandle,
3185                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3186 {
3187         struct nfs4_exception exception = { };
3188         struct rpc_clnt *client = *clnt;
3189         int err;
3190         do {
3191                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3192                 trace_nfs4_lookup(dir, name, err);
3193                 switch (err) {
3194                 case -NFS4ERR_BADNAME:
3195                         err = -ENOENT;
3196                         goto out;
3197                 case -NFS4ERR_MOVED:
3198                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3199                         goto out;
3200                 case -NFS4ERR_WRONGSEC:
3201                         err = -EPERM;
3202                         if (client != *clnt)
3203                                 goto out;
3204                         client = nfs4_create_sec_client(client, dir, name);
3205                         if (IS_ERR(client))
3206                                 return PTR_ERR(client);
3207
3208                         exception.retry = 1;
3209                         break;
3210                 default:
3211                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3212                 }
3213         } while (exception.retry);
3214
3215 out:
3216         if (err == 0)
3217                 *clnt = client;
3218         else if (client != *clnt)
3219                 rpc_shutdown_client(client);
3220
3221         return err;
3222 }
3223
3224 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3225                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3226                             struct nfs4_label *label)
3227 {
3228         int status;
3229         struct rpc_clnt *client = NFS_CLIENT(dir);
3230
3231         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3232         if (client != NFS_CLIENT(dir)) {
3233                 rpc_shutdown_client(client);
3234                 nfs_fixup_secinfo_attributes(fattr);
3235         }
3236         return status;
3237 }
3238
3239 struct rpc_clnt *
3240 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3241                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3242 {
3243         struct rpc_clnt *client = NFS_CLIENT(dir);
3244         int status;
3245
3246         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3247         if (status < 0)
3248                 return ERR_PTR(status);
3249         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3250 }
3251
3252 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3253 {
3254         struct nfs_server *server = NFS_SERVER(inode);
3255         struct nfs4_accessargs args = {
3256                 .fh = NFS_FH(inode),
3257                 .bitmask = server->cache_consistency_bitmask,
3258         };
3259         struct nfs4_accessres res = {
3260                 .server = server,
3261         };
3262         struct rpc_message msg = {
3263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3264                 .rpc_argp = &args,
3265                 .rpc_resp = &res,
3266                 .rpc_cred = entry->cred,
3267         };
3268         int mode = entry->mask;
3269         int status = 0;
3270
3271         /*
3272          * Determine which access bits we want to ask for...
3273          */
3274         if (mode & MAY_READ)
3275                 args.access |= NFS4_ACCESS_READ;
3276         if (S_ISDIR(inode->i_mode)) {
3277                 if (mode & MAY_WRITE)
3278                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3279                 if (mode & MAY_EXEC)
3280                         args.access |= NFS4_ACCESS_LOOKUP;
3281         } else {
3282                 if (mode & MAY_WRITE)
3283                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3284                 if (mode & MAY_EXEC)
3285                         args.access |= NFS4_ACCESS_EXECUTE;
3286         }
3287
3288         res.fattr = nfs_alloc_fattr();
3289         if (res.fattr == NULL)
3290                 return -ENOMEM;
3291
3292         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3293         if (!status) {
3294                 nfs_access_set_mask(entry, res.access);
3295                 nfs_refresh_inode(inode, res.fattr);
3296         }
3297         nfs_free_fattr(res.fattr);
3298         return status;
3299 }
3300
3301 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3302 {
3303         struct nfs4_exception exception = { };
3304         int err;
3305         do {
3306                 err = _nfs4_proc_access(inode, entry);
3307                 trace_nfs4_access(inode, err);
3308                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3309                                 &exception);
3310         } while (exception.retry);
3311         return err;
3312 }
3313
3314 /*
3315  * TODO: For the time being, we don't try to get any attributes
3316  * along with any of the zero-copy operations READ, READDIR,
3317  * READLINK, WRITE.
3318  *
3319  * In the case of the first three, we want to put the GETATTR
3320  * after the read-type operation -- this is because it is hard
3321  * to predict the length of a GETATTR response in v4, and thus
3322  * align the READ data correctly.  This means that the GETATTR
3323  * may end up partially falling into the page cache, and we should
3324  * shift it into the 'tail' of the xdr_buf before processing.
3325  * To do this efficiently, we need to know the total length
3326  * of data received, which doesn't seem to be available outside
3327  * of the RPC layer.
3328  *
3329  * In the case of WRITE, we also want to put the GETATTR after
3330  * the operation -- in this case because we want to make sure
3331  * we get the post-operation mtime and size.
3332  *
3333  * Both of these changes to the XDR layer would in fact be quite
3334  * minor, but I decided to leave them for a subsequent patch.
3335  */
3336 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3337                 unsigned int pgbase, unsigned int pglen)
3338 {
3339         struct nfs4_readlink args = {
3340                 .fh       = NFS_FH(inode),
3341                 .pgbase   = pgbase,
3342                 .pglen    = pglen,
3343                 .pages    = &page,
3344         };
3345         struct nfs4_readlink_res res;
3346         struct rpc_message msg = {
3347                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3348                 .rpc_argp = &args,
3349                 .rpc_resp = &res,
3350         };
3351
3352         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3353 }
3354
3355 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3356                 unsigned int pgbase, unsigned int pglen)
3357 {
3358         struct nfs4_exception exception = { };
3359         int err;
3360         do {
3361                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3362                 trace_nfs4_readlink(inode, err);
3363                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3364                                 &exception);
3365         } while (exception.retry);
3366         return err;
3367 }
3368
3369 /*
3370  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3371  */
3372 static int
3373 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3374                  int flags)
3375 {
3376         struct nfs4_label l, *ilabel = NULL;
3377         struct nfs_open_context *ctx;
3378         struct nfs4_state *state;
3379         int opened = 0;
3380         int status = 0;
3381
3382         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3383         if (IS_ERR(ctx))
3384                 return PTR_ERR(ctx);
3385
3386         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3387
3388         sattr->ia_mode &= ~current_umask();
3389         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3390         if (IS_ERR(state)) {
3391                 status = PTR_ERR(state);
3392                 goto out;
3393         }
3394 out:
3395         nfs4_label_release_security(ilabel);
3396         put_nfs_open_context(ctx);
3397         return status;
3398 }
3399
3400 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3401 {
3402         struct nfs_server *server = NFS_SERVER(dir);
3403         struct nfs_removeargs args = {
3404                 .fh = NFS_FH(dir),
3405                 .name = *name,
3406         };
3407         struct nfs_removeres res = {
3408                 .server = server,
3409         };
3410         struct rpc_message msg = {
3411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3412                 .rpc_argp = &args,
3413                 .rpc_resp = &res,
3414         };
3415         int status;
3416
3417         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3418         if (status == 0)
3419                 update_changeattr(dir, &res.cinfo);
3420         return status;
3421 }
3422
3423 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3424 {
3425         struct nfs4_exception exception = { };
3426         int err;
3427         do {
3428                 err = _nfs4_proc_remove(dir, name);
3429                 trace_nfs4_remove(dir, name, err);
3430                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3431                                 &exception);
3432         } while (exception.retry);
3433         return err;
3434 }
3435
3436 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3437 {
3438         struct nfs_server *server = NFS_SERVER(dir);
3439         struct nfs_removeargs *args = msg->rpc_argp;
3440         struct nfs_removeres *res = msg->rpc_resp;
3441
3442         res->server = server;
3443         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3444         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3445
3446         nfs_fattr_init(res->dir_attr);
3447 }
3448
3449 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3450 {
3451         nfs4_setup_sequence(NFS_SERVER(data->dir),
3452                         &data->args.seq_args,
3453                         &data->res.seq_res,
3454                         task);
3455 }
3456
3457 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3458 {
3459         struct nfs_unlinkdata *data = task->tk_calldata;
3460         struct nfs_removeres *res = &data->res;
3461
3462         if (!nfs4_sequence_done(task, &res->seq_res))
3463                 return 0;
3464         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3465                 return 0;
3466         update_changeattr(dir, &res->cinfo);
3467         return 1;
3468 }
3469
3470 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3471 {
3472         struct nfs_server *server = NFS_SERVER(dir);
3473         struct nfs_renameargs *arg = msg->rpc_argp;
3474         struct nfs_renameres *res = msg->rpc_resp;
3475
3476         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3477         res->server = server;
3478         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3479 }
3480
3481 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3482 {
3483         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3484                         &data->args.seq_args,
3485                         &data->res.seq_res,
3486                         task);
3487 }
3488
3489 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3490                                  struct inode *new_dir)
3491 {
3492         struct nfs_renamedata *data = task->tk_calldata;
3493         struct nfs_renameres *res = &data->res;
3494
3495         if (!nfs4_sequence_done(task, &res->seq_res))
3496                 return 0;
3497         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3498                 return 0;
3499
3500         update_changeattr(old_dir, &res->old_cinfo);
3501         update_changeattr(new_dir, &res->new_cinfo);
3502         return 1;
3503 }
3504
3505 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3506                 struct inode *new_dir, struct qstr *new_name)
3507 {
3508         struct nfs_server *server = NFS_SERVER(old_dir);
3509         struct nfs_renameargs arg = {
3510                 .old_dir = NFS_FH(old_dir),
3511                 .new_dir = NFS_FH(new_dir),
3512                 .old_name = old_name,
3513                 .new_name = new_name,
3514         };
3515         struct nfs_renameres res = {
3516                 .server = server,
3517         };
3518         struct rpc_message msg = {
3519                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3520                 .rpc_argp = &arg,
3521                 .rpc_resp = &res,
3522         };
3523         int status = -ENOMEM;
3524
3525         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3526         if (!status) {
3527                 update_changeattr(old_dir, &res.old_cinfo);
3528                 update_changeattr(new_dir, &res.new_cinfo);
3529         }
3530         return status;
3531 }
3532
3533 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3534                 struct inode *new_dir, struct qstr *new_name)
3535 {
3536         struct nfs4_exception exception = { };
3537         int err;
3538         do {
3539                 err = _nfs4_proc_rename(old_dir, old_name,
3540                                         new_dir, new_name);
3541                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3542                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3543                                 &exception);
3544         } while (exception.retry);
3545         return err;
3546 }
3547
3548 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3549 {
3550         struct nfs_server *server = NFS_SERVER(inode);
3551         struct nfs4_link_arg arg = {
3552                 .fh     = NFS_FH(inode),
3553                 .dir_fh = NFS_FH(dir),
3554                 .name   = name,
3555                 .bitmask = server->attr_bitmask,
3556         };
3557         struct nfs4_link_res res = {
3558                 .server = server,
3559                 .label = NULL,
3560         };
3561         struct rpc_message msg = {
3562                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3563                 .rpc_argp = &arg,
3564                 .rpc_resp = &res,
3565         };
3566         int status = -ENOMEM;
3567
3568         res.fattr = nfs_alloc_fattr();
3569         if (res.fattr == NULL)
3570                 goto out;
3571
3572         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3573         if (IS_ERR(res.label)) {
3574                 status = PTR_ERR(res.label);
3575                 goto out;
3576         }
3577         arg.bitmask = nfs4_bitmask(server, res.label);
3578
3579         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3580         if (!status) {
3581                 update_changeattr(dir, &res.cinfo);
3582                 status = nfs_post_op_update_inode(inode, res.fattr);
3583                 if (!status)
3584                         nfs_setsecurity(inode, res.fattr, res.label);
3585         }
3586
3587
3588         nfs4_label_free(res.label);
3589
3590 out:
3591         nfs_free_fattr(res.fattr);
3592         return status;
3593 }
3594
3595 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3596 {
3597         struct nfs4_exception exception = { };
3598         int err;
3599         do {
3600                 err = nfs4_handle_exception(NFS_SERVER(inode),
3601                                 _nfs4_proc_link(inode, dir, name),
3602                                 &exception);
3603         } while (exception.retry);
3604         return err;
3605 }
3606
3607 struct nfs4_createdata {
3608         struct rpc_message msg;
3609         struct nfs4_create_arg arg;
3610         struct nfs4_create_res res;
3611         struct nfs_fh fh;
3612         struct nfs_fattr fattr;
3613         struct nfs4_label *label;
3614 };
3615
3616 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3617                 struct qstr *name, struct iattr *sattr, u32 ftype)
3618 {
3619         struct nfs4_createdata *data;
3620
3621         data = kzalloc(sizeof(*data), GFP_KERNEL);
3622         if (data != NULL) {
3623                 struct nfs_server *server = NFS_SERVER(dir);
3624
3625                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3626                 if (IS_ERR(data->label))
3627                         goto out_free;
3628
3629                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3630                 data->msg.rpc_argp = &data->arg;
3631                 data->msg.rpc_resp = &data->res;
3632                 data->arg.dir_fh = NFS_FH(dir);
3633                 data->arg.server = server;
3634                 data->arg.name = name;
3635                 data->arg.attrs = sattr;
3636                 data->arg.ftype = ftype;
3637                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3638                 data->res.server = server;
3639                 data->res.fh = &data->fh;
3640                 data->res.fattr = &data->fattr;
3641                 data->res.label = data->label;
3642                 nfs_fattr_init(data->res.fattr);
3643         }
3644         return data;
3645 out_free:
3646         kfree(data);
3647         return NULL;
3648 }
3649
3650 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3651 {
3652         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3653                                     &data->arg.seq_args, &data->res.seq_res, 1);
3654         if (status == 0) {
3655                 update_changeattr(dir, &data->res.dir_cinfo);
3656                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3657         }
3658         return status;
3659 }
3660
3661 static void nfs4_free_createdata(struct nfs4_createdata *data)
3662 {
3663         nfs4_label_free(data->label);
3664         kfree(data);
3665 }
3666
3667 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3668                 struct page *page, unsigned int len, struct iattr *sattr,
3669                 struct nfs4_label *label)
3670 {
3671         struct nfs4_createdata *data;
3672         int status = -ENAMETOOLONG;
3673
3674         if (len > NFS4_MAXPATHLEN)
3675                 goto out;
3676
3677         status = -ENOMEM;
3678         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3679         if (data == NULL)
3680                 goto out;
3681
3682         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3683         data->arg.u.symlink.pages = &page;
3684         data->arg.u.symlink.len = len;
3685         data->arg.label = label;
3686
3687         status = nfs4_do_create(dir, dentry, data);
3688
3689         nfs4_free_createdata(data);
3690 out:
3691         return status;
3692 }
3693
3694 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3695                 struct page *page, unsigned int len, struct iattr *sattr)
3696 {
3697         struct nfs4_exception exception = { };
3698         struct nfs4_label l, *label = NULL;
3699         int err;
3700
3701         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3702
3703         do {
3704                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3705                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3706                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3707                                 &exception);
3708         } while (exception.retry);
3709
3710         nfs4_label_release_security(label);
3711         return err;
3712 }
3713
3714 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3715                 struct iattr *sattr, struct nfs4_label *label)
3716 {
3717         struct nfs4_createdata *data;
3718         int status = -ENOMEM;
3719
3720         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3721         if (data == NULL)
3722                 goto out;
3723
3724         data->arg.label = label;
3725         status = nfs4_do_create(dir, dentry, data);
3726
3727         nfs4_free_createdata(data);
3728 out:
3729         return status;
3730 }
3731
3732 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3733                 struct iattr *sattr)
3734 {
3735         struct nfs4_exception exception = { };
3736         struct nfs4_label l, *label = NULL;
3737         int err;
3738
3739         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3740
3741         sattr->ia_mode &= ~current_umask();
3742         do {
3743                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3744                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3745                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3746                                 &exception);
3747         } while (exception.retry);
3748         nfs4_label_release_security(label);
3749
3750         return err;
3751 }
3752
3753 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3754                 u64 cookie, struct page **pages, unsigned int count, int plus)
3755 {
3756         struct inode            *dir = dentry->d_inode;
3757         struct nfs4_readdir_arg args = {
3758                 .fh = NFS_FH(dir),
3759                 .pages = pages,
3760                 .pgbase = 0,
3761                 .count = count,
3762                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3763                 .plus = plus,
3764         };
3765         struct nfs4_readdir_res res;
3766         struct rpc_message msg = {
3767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3768                 .rpc_argp = &args,
3769                 .rpc_resp = &res,
3770                 .rpc_cred = cred,
3771         };
3772         int                     status;
3773
3774         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3775                         dentry->d_parent->d_name.name,
3776                         dentry->d_name.name,
3777                         (unsigned long long)cookie);
3778         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3779         res.pgbase = args.pgbase;
3780         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3781         if (status >= 0) {
3782                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3783                 status += args.pgbase;
3784         }
3785
3786         nfs_invalidate_atime(dir);
3787
3788         dprintk("%s: returns %d\n", __func__, status);
3789         return status;
3790 }
3791
3792 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3793                 u64 cookie, struct page **pages, unsigned int count, int plus)
3794 {
3795         struct nfs4_exception exception = { };
3796         int err;
3797         do {
3798                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3799                                 pages, count, plus);
3800                 trace_nfs4_readdir(dentry->d_inode, err);
3801                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3802                                 &exception);
3803         } while (exception.retry);
3804         return err;
3805 }
3806
3807 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3808                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3809 {
3810         struct nfs4_createdata *data;
3811         int mode = sattr->ia_mode;
3812         int status = -ENOMEM;
3813
3814         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3815         if (data == NULL)
3816                 goto out;
3817
3818         if (S_ISFIFO(mode))
3819                 data->arg.ftype = NF4FIFO;
3820         else if (S_ISBLK(mode)) {
3821                 data->arg.ftype = NF4BLK;
3822                 data->arg.u.device.specdata1 = MAJOR(rdev);
3823                 data->arg.u.device.specdata2 = MINOR(rdev);
3824         }
3825         else if (S_ISCHR(mode)) {
3826                 data->arg.ftype = NF4CHR;
3827                 data->arg.u.device.specdata1 = MAJOR(rdev);
3828                 data->arg.u.device.specdata2 = MINOR(rdev);
3829         } else if (!S_ISSOCK(mode)) {
3830                 status = -EINVAL;
3831                 goto out_free;
3832         }
3833
3834         data->arg.label = label;
3835         status = nfs4_do_create(dir, dentry, data);
3836 out_free:
3837         nfs4_free_createdata(data);
3838 out:
3839         return status;
3840 }
3841
3842 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3843                 struct iattr *sattr, dev_t rdev)
3844 {
3845         struct nfs4_exception exception = { };
3846         struct nfs4_label l, *label = NULL;
3847         int err;
3848
3849         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3850
3851         sattr->ia_mode &= ~current_umask();
3852         do {
3853                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3854                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3855                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3856                                 &exception);
3857         } while (exception.retry);
3858
3859         nfs4_label_release_security(label);
3860
3861         return err;
3862 }
3863
3864 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3865                  struct nfs_fsstat *fsstat)
3866 {
3867         struct nfs4_statfs_arg args = {
3868                 .fh = fhandle,
3869                 .bitmask = server->attr_bitmask,
3870         };
3871         struct nfs4_statfs_res res = {
3872                 .fsstat = fsstat,
3873         };
3874         struct rpc_message msg = {
3875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3876                 .rpc_argp = &args,
3877                 .rpc_resp = &res,
3878         };
3879
3880         nfs_fattr_init(fsstat->fattr);
3881         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3882 }
3883
3884 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3885 {
3886         struct nfs4_exception exception = { };
3887         int err;
3888         do {
3889                 err = nfs4_handle_exception(server,
3890                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3891                                 &exception);
3892         } while (exception.retry);
3893         return err;
3894 }
3895
3896 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3897                 struct nfs_fsinfo *fsinfo)
3898 {
3899         struct nfs4_fsinfo_arg args = {
3900                 .fh = fhandle,
3901                 .bitmask = server->attr_bitmask,
3902         };
3903         struct nfs4_fsinfo_res res = {
3904                 .fsinfo = fsinfo,
3905         };
3906         struct rpc_message msg = {
3907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3908                 .rpc_argp = &args,
3909                 .rpc_resp = &res,
3910         };
3911
3912         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3913 }
3914
3915 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3916 {
3917         struct nfs4_exception exception = { };
3918         unsigned long now = jiffies;
3919         int err;
3920
3921         do {
3922                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3923                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3924                 if (err == 0) {
3925                         struct nfs_client *clp = server->nfs_client;
3926
3927                         spin_lock(&clp->cl_lock);
3928                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3929                         clp->cl_last_renewal = now;
3930                         spin_unlock(&clp->cl_lock);
3931                         break;
3932                 }
3933                 err = nfs4_handle_exception(server, err, &exception);
3934         } while (exception.retry);
3935         return err;
3936 }
3937
3938 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3939 {
3940         int error;
3941
3942         nfs_fattr_init(fsinfo->fattr);
3943         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3944         if (error == 0) {
3945                 /* block layout checks this! */
3946                 server->pnfs_blksize = fsinfo->blksize;
3947                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3948         }
3949
3950         return error;
3951 }
3952
3953 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3954                 struct nfs_pathconf *pathconf)
3955 {
3956         struct nfs4_pathconf_arg args = {
3957                 .fh = fhandle,
3958                 .bitmask = server->attr_bitmask,
3959         };
3960         struct nfs4_pathconf_res res = {
3961                 .pathconf = pathconf,
3962         };
3963         struct rpc_message msg = {
3964                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3965                 .rpc_argp = &args,
3966                 .rpc_resp = &res,
3967         };
3968
3969         /* None of the pathconf attributes are mandatory to implement */
3970         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3971                 memset(pathconf, 0, sizeof(*pathconf));
3972                 return 0;
3973         }
3974
3975         nfs_fattr_init(pathconf->fattr);
3976         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3977 }
3978
3979 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3980                 struct nfs_pathconf *pathconf)
3981 {
3982         struct nfs4_exception exception = { };
3983         int err;
3984
3985         do {
3986                 err = nfs4_handle_exception(server,
3987                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3988                                 &exception);
3989         } while (exception.retry);
3990         return err;
3991 }
3992
3993 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3994                 const struct nfs_open_context *ctx,
3995                 const struct nfs_lock_context *l_ctx,
3996                 fmode_t fmode)
3997 {
3998         const struct nfs_lockowner *lockowner = NULL;
3999
4000         if (l_ctx != NULL)
4001                 lockowner = &l_ctx->lockowner;
4002         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4003 }
4004 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4005
4006 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4007                 const struct nfs_open_context *ctx,
4008                 const struct nfs_lock_context *l_ctx,
4009                 fmode_t fmode)
4010 {
4011         nfs4_stateid current_stateid;
4012
4013         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
4014                 return false;
4015         return nfs4_stateid_match(stateid, &current_stateid);
4016 }
4017
4018 static bool nfs4_error_stateid_expired(int err)
4019 {
4020         switch (err) {
4021         case -NFS4ERR_DELEG_REVOKED:
4022         case -NFS4ERR_ADMIN_REVOKED:
4023         case -NFS4ERR_BAD_STATEID:
4024         case -NFS4ERR_STALE_STATEID:
4025         case -NFS4ERR_OLD_STATEID:
4026         case -NFS4ERR_OPENMODE:
4027         case -NFS4ERR_EXPIRED:
4028                 return true;
4029         }
4030         return false;
4031 }
4032
4033 void __nfs4_read_done_cb(struct nfs_read_data *data)
4034 {
4035         nfs_invalidate_atime(data->header->inode);
4036 }
4037
4038 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
4039 {
4040         struct nfs_server *server = NFS_SERVER(data->header->inode);
4041
4042         trace_nfs4_read(data, task->tk_status);
4043         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4044                 rpc_restart_call_prepare(task);
4045                 return -EAGAIN;
4046         }
4047
4048         __nfs4_read_done_cb(data);
4049         if (task->tk_status > 0)
4050                 renew_lease(server, data->timestamp);
4051         return 0;
4052 }
4053
4054 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4055                 struct nfs_readargs *args)
4056 {
4057
4058         if (!nfs4_error_stateid_expired(task->tk_status) ||
4059                 nfs4_stateid_is_current(&args->stateid,
4060                                 args->context,
4061                                 args->lock_context,
4062                                 FMODE_READ))
4063                 return false;
4064         rpc_restart_call_prepare(task);
4065         return true;
4066 }
4067
4068 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4069 {
4070
4071         dprintk("--> %s\n", __func__);
4072
4073         if (!nfs4_sequence_done(task, &data->res.seq_res))
4074                 return -EAGAIN;
4075         if (nfs4_read_stateid_changed(task, &data->args))
4076                 return -EAGAIN;
4077         return data->read_done_cb ? data->read_done_cb(task, data) :
4078                                     nfs4_read_done_cb(task, data);
4079 }
4080
4081 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4082 {
4083         data->timestamp   = jiffies;
4084         data->read_done_cb = nfs4_read_done_cb;
4085         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4086         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4087 }
4088
4089 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4090 {
4091         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4092                         &data->args.seq_args,
4093                         &data->res.seq_res,
4094                         task))
4095                 return 0;
4096         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4097                                 data->args.lock_context, FMODE_READ) == -EIO)
4098                 return -EIO;
4099         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4100                 return -EIO;
4101         return 0;
4102 }
4103
4104 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4105 {
4106         struct inode *inode = data->header->inode;
4107
4108         trace_nfs4_write(data, task->tk_status);
4109         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4110                 rpc_restart_call_prepare(task);
4111                 return -EAGAIN;
4112         }
4113         if (task->tk_status >= 0) {
4114                 renew_lease(NFS_SERVER(inode), data->timestamp);
4115                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4116         }
4117         return 0;
4118 }
4119
4120 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4121                 struct nfs_writeargs *args)
4122 {
4123
4124         if (!nfs4_error_stateid_expired(task->tk_status) ||
4125                 nfs4_stateid_is_current(&args->stateid,
4126                                 args->context,
4127                                 args->lock_context,
4128                                 FMODE_WRITE))
4129                 return false;
4130         rpc_restart_call_prepare(task);
4131         return true;
4132 }
4133
4134 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4135 {
4136         if (!nfs4_sequence_done(task, &data->res.seq_res))
4137                 return -EAGAIN;
4138         if (nfs4_write_stateid_changed(task, &data->args))
4139                 return -EAGAIN;
4140         return data->write_done_cb ? data->write_done_cb(task, data) :
4141                 nfs4_write_done_cb(task, data);
4142 }
4143
4144 static
4145 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4146 {
4147         const struct nfs_pgio_header *hdr = data->header;
4148
4149         /* Don't request attributes for pNFS or O_DIRECT writes */
4150         if (data->ds_clp != NULL || hdr->dreq != NULL)
4151                 return false;
4152         /* Otherwise, request attributes if and only if we don't hold
4153          * a delegation
4154          */
4155         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4156 }
4157
4158 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4159 {
4160         struct nfs_server *server = NFS_SERVER(data->header->inode);
4161
4162         if (!nfs4_write_need_cache_consistency_data(data)) {
4163                 data->args.bitmask = NULL;
4164                 data->res.fattr = NULL;
4165         } else
4166                 data->args.bitmask = server->cache_consistency_bitmask;
4167
4168         if (!data->write_done_cb)
4169                 data->write_done_cb = nfs4_write_done_cb;
4170         data->res.server = server;
4171         data->timestamp   = jiffies;
4172
4173         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4174         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4175 }
4176
4177 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4178 {
4179         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4180                         &data->args.seq_args,
4181                         &data->res.seq_res,
4182                         task))
4183                 return 0;
4184         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4185                                 data->args.lock_context, FMODE_WRITE) == -EIO)
4186                 return -EIO;
4187         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4188                 return -EIO;
4189         return 0;
4190 }
4191
4192 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4193 {
4194         nfs4_setup_sequence(NFS_SERVER(data->inode),
4195                         &data->args.seq_args,
4196                         &data->res.seq_res,
4197                         task);
4198 }
4199
4200 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4201 {
4202         struct inode *inode = data->inode;
4203
4204         trace_nfs4_commit(data, task->tk_status);
4205         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4206                 rpc_restart_call_prepare(task);
4207                 return -EAGAIN;
4208         }
4209         return 0;
4210 }
4211
4212 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4213 {
4214         if (!nfs4_sequence_done(task, &data->res.seq_res))
4215                 return -EAGAIN;
4216         return data->commit_done_cb(task, data);
4217 }
4218
4219 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4220 {
4221         struct nfs_server *server = NFS_SERVER(data->inode);
4222
4223         if (data->commit_done_cb == NULL)
4224                 data->commit_done_cb = nfs4_commit_done_cb;
4225         data->res.server = server;
4226         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4227         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4228 }
4229
4230 struct nfs4_renewdata {
4231         struct nfs_client       *client;
4232         unsigned long           timestamp;
4233 };
4234
4235 /*
4236  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4237  * standalone procedure for queueing an asynchronous RENEW.
4238  */
4239 static void nfs4_renew_release(void *calldata)
4240 {
4241         struct nfs4_renewdata *data = calldata;
4242         struct nfs_client *clp = data->client;
4243
4244         if (atomic_read(&clp->cl_count) > 1)
4245                 nfs4_schedule_state_renewal(clp);
4246         nfs_put_client(clp);
4247         kfree(data);
4248 }
4249
4250 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4251 {
4252         struct nfs4_renewdata *data = calldata;
4253         struct nfs_client *clp = data->client;
4254         unsigned long timestamp = data->timestamp;
4255
4256         trace_nfs4_renew_async(clp, task->tk_status);
4257         switch (task->tk_status) {
4258         case 0:
4259                 break;
4260         case -NFS4ERR_LEASE_MOVED:
4261                 nfs4_schedule_lease_moved_recovery(clp);
4262                 break;
4263         default:
4264                 /* Unless we're shutting down, schedule state recovery! */
4265                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4266                         return;
4267                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4268                         nfs4_schedule_lease_recovery(clp);
4269                         return;
4270                 }
4271                 nfs4_schedule_path_down_recovery(clp);
4272         }
4273         do_renew_lease(clp, timestamp);
4274 }
4275
4276 static const struct rpc_call_ops nfs4_renew_ops = {
4277         .rpc_call_done = nfs4_renew_done,
4278         .rpc_release = nfs4_renew_release,
4279 };
4280
4281 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4282 {
4283         struct rpc_message msg = {
4284                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4285                 .rpc_argp       = clp,
4286                 .rpc_cred       = cred,
4287         };
4288         struct nfs4_renewdata *data;
4289
4290         if (renew_flags == 0)
4291                 return 0;
4292         if (!atomic_inc_not_zero(&clp->cl_count))
4293                 return -EIO;
4294         data = kmalloc(sizeof(*data), GFP_NOFS);
4295         if (data == NULL)
4296                 return -ENOMEM;
4297         data->client = clp;
4298         data->timestamp = jiffies;
4299         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4300                         &nfs4_renew_ops, data);
4301 }
4302
4303 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4304 {
4305         struct rpc_message msg = {
4306                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4307                 .rpc_argp       = clp,
4308                 .rpc_cred       = cred,
4309         };
4310         unsigned long now = jiffies;
4311         int status;
4312
4313         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4314         if (status < 0)
4315                 return status;
4316         do_renew_lease(clp, now);
4317         return 0;
4318 }
4319
4320 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4321 {
4322         return (server->caps & NFS_CAP_ACLS)
4323                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4324                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4325 }
4326
4327 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4328  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4329  * the stack.
4330  */
4331 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4332
4333 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4334                 struct page **pages, unsigned int *pgbase)
4335 {
4336         struct page *newpage, **spages;
4337         int rc = 0;
4338         size_t len;
4339         spages = pages;
4340
4341         do {
4342                 len = min_t(size_t, PAGE_SIZE, buflen);
4343                 newpage = alloc_page(GFP_KERNEL);
4344
4345                 if (newpage == NULL)
4346                         goto unwind;
4347                 memcpy(page_address(newpage), buf, len);
4348                 buf += len;
4349                 buflen -= len;
4350                 *pages++ = newpage;
4351                 rc++;
4352         } while (buflen != 0);
4353
4354         return rc;
4355
4356 unwind:
4357         for(; rc > 0; rc--)
4358                 __free_page(spages[rc-1]);
4359         return -ENOMEM;
4360 }
4361
4362 struct nfs4_cached_acl {
4363         int cached;
4364         size_t len;
4365         char data[0];
4366 };
4367
4368 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4369 {
4370         struct nfs_inode *nfsi = NFS_I(inode);
4371
4372         spin_lock(&inode->i_lock);
4373         kfree(nfsi->nfs4_acl);
4374         nfsi->nfs4_acl = acl;
4375         spin_unlock(&inode->i_lock);
4376 }
4377
4378 static void nfs4_zap_acl_attr(struct inode *inode)
4379 {
4380         nfs4_set_cached_acl(inode, NULL);
4381 }
4382
4383 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4384 {
4385         struct nfs_inode *nfsi = NFS_I(inode);
4386         struct nfs4_cached_acl *acl;
4387         int ret = -ENOENT;
4388
4389         spin_lock(&inode->i_lock);
4390         acl = nfsi->nfs4_acl;
4391         if (acl == NULL)
4392                 goto out;
4393         if (buf == NULL) /* user is just asking for length */
4394                 goto out_len;
4395         if (acl->cached == 0)
4396                 goto out;
4397         ret = -ERANGE; /* see getxattr(2) man page */
4398         if (acl->len > buflen)
4399                 goto out;
4400         memcpy(buf, acl->data, acl->len);
4401 out_len:
4402         ret = acl->len;
4403 out:
4404         spin_unlock(&inode->i_lock);
4405         return ret;
4406 }
4407
4408 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4409 {
4410         struct nfs4_cached_acl *acl;
4411         size_t buflen = sizeof(*acl) + acl_len;
4412
4413         if (buflen <= PAGE_SIZE) {
4414                 acl = kmalloc(buflen, GFP_KERNEL);
4415                 if (acl == NULL)
4416                         goto out;
4417                 acl->cached = 1;
4418                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4419         } else {
4420                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4421                 if (acl == NULL)
4422                         goto out;
4423                 acl->cached = 0;
4424         }
4425         acl->len = acl_len;
4426 out:
4427         nfs4_set_cached_acl(inode, acl);
4428 }
4429
4430 /*
4431  * The getxattr API returns the required buffer length when called with a
4432  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4433  * the required buf.  On a NULL buf, we send a page of data to the server
4434  * guessing that the ACL request can be serviced by a page. If so, we cache
4435  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4436  * the cache. If not so, we throw away the page, and cache the required
4437  * length. The next getxattr call will then produce another round trip to
4438  * the server, this time with the input buf of the required size.
4439  */
4440 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4441 {
4442         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4443         struct nfs_getaclargs args = {
4444                 .fh = NFS_FH(inode),
4445                 .acl_pages = pages,
4446                 .acl_len = buflen,
4447         };
4448         struct nfs_getaclres res = {
4449                 .acl_len = buflen,
4450         };
4451         struct rpc_message msg = {
4452                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4453                 .rpc_argp = &args,
4454                 .rpc_resp = &res,
4455         };
4456         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4457         int ret = -ENOMEM, i;
4458
4459         /* As long as we're doing a round trip to the server anyway,
4460          * let's be prepared for a page of acl data. */
4461         if (npages == 0)
4462                 npages = 1;
4463         if (npages > ARRAY_SIZE(pages))
4464                 return -ERANGE;
4465
4466         for (i = 0; i < npages; i++) {
4467                 pages[i] = alloc_page(GFP_KERNEL);
4468                 if (!pages[i])
4469                         goto out_free;
4470         }
4471
4472         /* for decoding across pages */
4473         res.acl_scratch = alloc_page(GFP_KERNEL);
4474         if (!res.acl_scratch)
4475                 goto out_free;
4476
4477         args.acl_len = npages * PAGE_SIZE;
4478         args.acl_pgbase = 0;
4479
4480         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4481                 __func__, buf, buflen, npages, args.acl_len);
4482         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4483                              &msg, &args.seq_args, &res.seq_res, 0);
4484         if (ret)
4485                 goto out_free;
4486
4487         /* Handle the case where the passed-in buffer is too short */
4488         if (res.acl_flags & NFS4_ACL_TRUNC) {
4489                 /* Did the user only issue a request for the acl length? */
4490                 if (buf == NULL)
4491                         goto out_ok;
4492                 ret = -ERANGE;
4493                 goto out_free;
4494         }
4495         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4496         if (buf) {
4497                 if (res.acl_len > buflen) {
4498                         ret = -ERANGE;
4499                         goto out_free;
4500                 }
4501                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4502         }
4503 out_ok:
4504         ret = res.acl_len;
4505 out_free:
4506         for (i = 0; i < npages; i++)
4507                 if (pages[i])
4508                         __free_page(pages[i]);
4509         if (res.acl_scratch)
4510                 __free_page(res.acl_scratch);
4511         return ret;
4512 }
4513
4514 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4515 {
4516         struct nfs4_exception exception = { };
4517         ssize_t ret;
4518         do {
4519                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4520                 trace_nfs4_get_acl(inode, ret);
4521                 if (ret >= 0)
4522                         break;
4523                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4524         } while (exception.retry);
4525         return ret;
4526 }
4527
4528 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4529 {
4530         struct nfs_server *server = NFS_SERVER(inode);
4531         int ret;
4532
4533         if (!nfs4_server_supports_acls(server))
4534                 return -EOPNOTSUPP;
4535         ret = nfs_revalidate_inode(server, inode);
4536         if (ret < 0)
4537                 return ret;
4538         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4539                 nfs_zap_acl_cache(inode);
4540         ret = nfs4_read_cached_acl(inode, buf, buflen);
4541         if (ret != -ENOENT)
4542                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4543                  * but no cached acl data, just the acl length */
4544                 return ret;
4545         return nfs4_get_acl_uncached(inode, buf, buflen);
4546 }
4547
4548 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4549 {
4550         struct nfs_server *server = NFS_SERVER(inode);
4551         struct page *pages[NFS4ACL_MAXPAGES];
4552         struct nfs_setaclargs arg = {
4553                 .fh             = NFS_FH(inode),
4554                 .acl_pages      = pages,
4555                 .acl_len        = buflen,
4556         };
4557         struct nfs_setaclres res;
4558         struct rpc_message msg = {
4559                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4560                 .rpc_argp       = &arg,
4561                 .rpc_resp       = &res,
4562         };
4563         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4564         int ret, i;
4565
4566         if (!nfs4_server_supports_acls(server))
4567                 return -EOPNOTSUPP;
4568         if (npages > ARRAY_SIZE(pages))
4569                 return -ERANGE;
4570         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4571         if (i < 0)
4572                 return i;
4573         nfs4_inode_return_delegation(inode);
4574         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4575
4576         /*
4577          * Free each page after tx, so the only ref left is
4578          * held by the network stack
4579          */
4580         for (; i > 0; i--)
4581                 put_page(pages[i-1]);
4582
4583         /*
4584          * Acl update can result in inode attribute update.
4585          * so mark the attribute cache invalid.
4586          */
4587         spin_lock(&inode->i_lock);
4588         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4589         spin_unlock(&inode->i_lock);
4590         nfs_access_zap_cache(inode);
4591         nfs_zap_acl_cache(inode);
4592         return ret;
4593 }
4594
4595 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4596 {
4597         struct nfs4_exception exception = { };
4598         int err;
4599         do {
4600                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4601                 trace_nfs4_set_acl(inode, err);
4602                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4603                                 &exception);
4604         } while (exception.retry);
4605         return err;
4606 }
4607
4608 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4609 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4610                                         size_t buflen)
4611 {
4612         struct nfs_server *server = NFS_SERVER(inode);
4613         struct nfs_fattr fattr;
4614         struct nfs4_label label = {0, 0, buflen, buf};
4615
4616         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4617         struct nfs4_getattr_arg arg = {
4618                 .fh             = NFS_FH(inode),
4619                 .bitmask        = bitmask,
4620         };
4621         struct nfs4_getattr_res res = {
4622                 .fattr          = &fattr,
4623                 .label          = &label,
4624                 .server         = server,
4625         };
4626         struct rpc_message msg = {
4627                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4628                 .rpc_argp       = &arg,
4629                 .rpc_resp       = &res,
4630         };
4631         int ret;
4632
4633         nfs_fattr_init(&fattr);
4634
4635         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4636         if (ret)
4637                 return ret;
4638         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4639                 return -ENOENT;
4640         if (buflen < label.len)
4641                 return -ERANGE;
4642         return 0;
4643 }
4644
4645 static int nfs4_get_security_label(struct inode *inode, void *buf,
4646                                         size_t buflen)
4647 {
4648         struct nfs4_exception exception = { };
4649         int err;
4650
4651         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4652                 return -EOPNOTSUPP;
4653
4654         do {
4655                 err = _nfs4_get_security_label(inode, buf, buflen);
4656                 trace_nfs4_get_security_label(inode, err);
4657                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4658                                 &exception);
4659         } while (exception.retry);
4660         return err;
4661 }
4662
4663 static int _nfs4_do_set_security_label(struct inode *inode,
4664                 struct nfs4_label *ilabel,
4665                 struct nfs_fattr *fattr,
4666                 struct nfs4_label *olabel)
4667 {
4668
4669         struct iattr sattr = {0};
4670         struct nfs_server *server = NFS_SERVER(inode);
4671         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4672         struct nfs_setattrargs arg = {
4673                 .fh             = NFS_FH(inode),
4674                 .iap            = &sattr,
4675                 .server         = server,
4676                 .bitmask        = bitmask,
4677                 .label          = ilabel,
4678         };
4679         struct nfs_setattrres res = {
4680                 .fattr          = fattr,
4681                 .label          = olabel,
4682                 .server         = server,
4683         };
4684         struct rpc_message msg = {
4685                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4686                 .rpc_argp       = &arg,
4687                 .rpc_resp       = &res,
4688         };
4689         int status;
4690
4691         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4692
4693         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4694         if (status)
4695                 dprintk("%s failed: %d\n", __func__, status);
4696
4697         return status;
4698 }
4699
4700 static int nfs4_do_set_security_label(struct inode *inode,
4701                 struct nfs4_label *ilabel,
4702                 struct nfs_fattr *fattr,
4703                 struct nfs4_label *olabel)
4704 {
4705         struct nfs4_exception exception = { };
4706         int err;
4707
4708         do {
4709                 err = _nfs4_do_set_security_label(inode, ilabel,
4710                                 fattr, olabel);
4711                 trace_nfs4_set_security_label(inode, err);
4712                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4713                                 &exception);
4714         } while (exception.retry);
4715         return err;
4716 }
4717
4718 static int
4719 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4720 {
4721         struct nfs4_label ilabel, *olabel = NULL;
4722         struct nfs_fattr fattr;
4723         struct rpc_cred *cred;
4724         struct inode *inode = dentry->d_inode;
4725         int status;
4726
4727         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4728                 return -EOPNOTSUPP;
4729
4730         nfs_fattr_init(&fattr);
4731
4732         ilabel.pi = 0;
4733         ilabel.lfs = 0;
4734         ilabel.label = (char *)buf;
4735         ilabel.len = buflen;
4736
4737         cred = rpc_lookup_cred();
4738         if (IS_ERR(cred))
4739                 return PTR_ERR(cred);
4740
4741         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4742         if (IS_ERR(olabel)) {
4743                 status = -PTR_ERR(olabel);
4744                 goto out;
4745         }
4746
4747         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4748         if (status == 0)
4749                 nfs_setsecurity(inode, &fattr, olabel);
4750
4751         nfs4_label_free(olabel);
4752 out:
4753         put_rpccred(cred);
4754         return status;
4755 }
4756 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4757
4758
4759 static int
4760 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4761 {
4762         struct nfs_client *clp = server->nfs_client;
4763
4764         if (task->tk_status >= 0)
4765                 return 0;
4766         switch(task->tk_status) {
4767                 case -NFS4ERR_DELEG_REVOKED:
4768                 case -NFS4ERR_ADMIN_REVOKED:
4769                 case -NFS4ERR_BAD_STATEID:
4770                         if (state == NULL)
4771                                 break;
4772                         nfs_remove_bad_delegation(state->inode);
4773                 case -NFS4ERR_OPENMODE:
4774                         if (state == NULL)
4775                                 break;
4776                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4777                                 goto recovery_failed;
4778                         goto wait_on_recovery;
4779                 case -NFS4ERR_EXPIRED:
4780                         if (state != NULL) {
4781                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4782                                         goto recovery_failed;
4783                         }
4784                 case -NFS4ERR_STALE_STATEID:
4785                 case -NFS4ERR_STALE_CLIENTID:
4786                         nfs4_schedule_lease_recovery(clp);
4787                         goto wait_on_recovery;
4788                 case -NFS4ERR_MOVED:
4789                         if (nfs4_schedule_migration_recovery(server) < 0)
4790                                 goto recovery_failed;
4791                         goto wait_on_recovery;
4792                 case -NFS4ERR_LEASE_MOVED:
4793                         nfs4_schedule_lease_moved_recovery(clp);
4794                         goto wait_on_recovery;
4795 #if defined(CONFIG_NFS_V4_1)
4796                 case -NFS4ERR_BADSESSION:
4797                 case -NFS4ERR_BADSLOT:
4798                 case -NFS4ERR_BAD_HIGH_SLOT:
4799                 case -NFS4ERR_DEADSESSION:
4800                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4801                 case -NFS4ERR_SEQ_FALSE_RETRY:
4802                 case -NFS4ERR_SEQ_MISORDERED:
4803                         dprintk("%s ERROR %d, Reset session\n", __func__,
4804                                 task->tk_status);
4805                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4806                         goto wait_on_recovery;
4807 #endif /* CONFIG_NFS_V4_1 */
4808                 case -NFS4ERR_DELAY:
4809                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4810                 case -NFS4ERR_GRACE:
4811                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4812                 case -NFS4ERR_RETRY_UNCACHED_REP:
4813                 case -NFS4ERR_OLD_STATEID:
4814                         goto restart_call;
4815         }
4816         task->tk_status = nfs4_map_errors(task->tk_status);
4817         return 0;
4818 recovery_failed:
4819         task->tk_status = -EIO;
4820         return 0;
4821 wait_on_recovery:
4822         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4823         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4824                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4825         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4826                 goto recovery_failed;
4827 restart_call:
4828         task->tk_status = 0;
4829         return -EAGAIN;
4830 }
4831
4832 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4833                                     nfs4_verifier *bootverf)
4834 {
4835         __be32 verf[2];
4836
4837         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4838                 /* An impossible timestamp guarantees this value
4839                  * will never match a generated boot time. */
4840                 verf[0] = 0;
4841                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4842         } else {
4843                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4844                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4845                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4846         }
4847         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4848 }
4849
4850 static unsigned int
4851 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4852                                    char *buf, size_t len)
4853 {
4854         unsigned int result;
4855
4856         rcu_read_lock();
4857         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4858                                 clp->cl_ipaddr,
4859                                 rpc_peeraddr2str(clp->cl_rpcclient,
4860                                                         RPC_DISPLAY_ADDR),
4861                                 rpc_peeraddr2str(clp->cl_rpcclient,
4862                                                         RPC_DISPLAY_PROTO));
4863         rcu_read_unlock();
4864         return result;
4865 }
4866
4867 static unsigned int
4868 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4869                                 char *buf, size_t len)
4870 {
4871         const char *nodename = clp->cl_rpcclient->cl_nodename;
4872
4873         if (nfs4_client_id_uniquifier[0] != '\0')
4874                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4875                                 clp->rpc_ops->version,
4876                                 clp->cl_minorversion,
4877                                 nfs4_client_id_uniquifier,
4878                                 nodename);
4879         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4880                                 clp->rpc_ops->version, clp->cl_minorversion,
4881                                 nodename);
4882 }
4883
4884 /**
4885  * nfs4_proc_setclientid - Negotiate client ID
4886  * @clp: state data structure
4887  * @program: RPC program for NFSv4 callback service
4888  * @port: IP port number for NFS4 callback service
4889  * @cred: RPC credential to use for this call
4890  * @res: where to place the result
4891  *
4892  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4893  */
4894 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4895                 unsigned short port, struct rpc_cred *cred,
4896                 struct nfs4_setclientid_res *res)
4897 {
4898         nfs4_verifier sc_verifier;
4899         struct nfs4_setclientid setclientid = {
4900                 .sc_verifier = &sc_verifier,
4901                 .sc_prog = program,
4902                 .sc_cb_ident = clp->cl_cb_ident,
4903         };
4904         struct rpc_message msg = {
4905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4906                 .rpc_argp = &setclientid,
4907                 .rpc_resp = res,
4908                 .rpc_cred = cred,
4909         };
4910         int status;
4911
4912         /* nfs_client_id4 */
4913         nfs4_init_boot_verifier(clp, &sc_verifier);
4914         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4915                 setclientid.sc_name_len =
4916                                 nfs4_init_uniform_client_string(clp,
4917                                                 setclientid.sc_name,
4918                                                 sizeof(setclientid.sc_name));
4919         else
4920                 setclientid.sc_name_len =
4921                                 nfs4_init_nonuniform_client_string(clp,
4922                                                 setclientid.sc_name,
4923                                                 sizeof(setclientid.sc_name));
4924         /* cb_client4 */
4925         rcu_read_lock();
4926         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4927                                 sizeof(setclientid.sc_netid), "%s",
4928                                 rpc_peeraddr2str(clp->cl_rpcclient,
4929                                                         RPC_DISPLAY_NETID));
4930         rcu_read_unlock();
4931         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4932                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4933                                 clp->cl_ipaddr, port >> 8, port & 255);
4934
4935         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4936                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4937                 setclientid.sc_name_len, setclientid.sc_name);
4938         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4939         trace_nfs4_setclientid(clp, status);
4940         dprintk("NFS reply setclientid: %d\n", status);
4941         return status;
4942 }
4943
4944 /**
4945  * nfs4_proc_setclientid_confirm - Confirm client ID
4946  * @clp: state data structure
4947  * @res: result of a previous SETCLIENTID
4948  * @cred: RPC credential to use for this call
4949  *
4950  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4951  */
4952 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4953                 struct nfs4_setclientid_res *arg,
4954                 struct rpc_cred *cred)
4955 {
4956         struct rpc_message msg = {
4957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4958                 .rpc_argp = arg,
4959                 .rpc_cred = cred,
4960         };
4961         int status;
4962
4963         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4964                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4965                 clp->cl_clientid);
4966         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4967         trace_nfs4_setclientid_confirm(clp, status);
4968         dprintk("NFS reply setclientid_confirm: %d\n", status);
4969         return status;
4970 }
4971
4972 struct nfs4_delegreturndata {
4973         struct nfs4_delegreturnargs args;
4974         struct nfs4_delegreturnres res;
4975         struct nfs_fh fh;
4976         nfs4_stateid stateid;
4977         unsigned long timestamp;
4978         struct nfs_fattr fattr;
4979         int rpc_status;
4980 };
4981
4982 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4983 {
4984         struct nfs4_delegreturndata *data = calldata;
4985
4986         if (!nfs4_sequence_done(task, &data->res.seq_res))
4987                 return;
4988
4989         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4990         switch (task->tk_status) {
4991         case 0:
4992                 renew_lease(data->res.server, data->timestamp);
4993                 break;
4994         case -NFS4ERR_ADMIN_REVOKED:
4995         case -NFS4ERR_DELEG_REVOKED:
4996         case -NFS4ERR_BAD_STATEID:
4997         case -NFS4ERR_OLD_STATEID:
4998         case -NFS4ERR_STALE_STATEID:
4999         case -NFS4ERR_EXPIRED:
5000                 task->tk_status = 0;
5001                 break;
5002         default:
5003                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
5004                                 -EAGAIN) {
5005                         rpc_restart_call_prepare(task);
5006                         return;
5007                 }
5008         }
5009         data->rpc_status = task->tk_status;
5010 }
5011
5012 static void nfs4_delegreturn_release(void *calldata)
5013 {
5014         kfree(calldata);
5015 }
5016
5017 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5018 {
5019         struct nfs4_delegreturndata *d_data;
5020
5021         d_data = (struct nfs4_delegreturndata *)data;
5022
5023         nfs4_setup_sequence(d_data->res.server,
5024                         &d_data->args.seq_args,
5025                         &d_data->res.seq_res,
5026                         task);
5027 }
5028
5029 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5030         .rpc_call_prepare = nfs4_delegreturn_prepare,
5031         .rpc_call_done = nfs4_delegreturn_done,
5032         .rpc_release = nfs4_delegreturn_release,
5033 };
5034
5035 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5036 {
5037         struct nfs4_delegreturndata *data;
5038         struct nfs_server *server = NFS_SERVER(inode);
5039         struct rpc_task *task;
5040         struct rpc_message msg = {
5041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5042                 .rpc_cred = cred,
5043         };
5044         struct rpc_task_setup task_setup_data = {
5045                 .rpc_client = server->client,
5046                 .rpc_message = &msg,
5047                 .callback_ops = &nfs4_delegreturn_ops,
5048                 .flags = RPC_TASK_ASYNC,
5049         };
5050         int status = 0;
5051
5052         data = kzalloc(sizeof(*data), GFP_NOFS);
5053         if (data == NULL)
5054                 return -ENOMEM;
5055         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5056         data->args.fhandle = &data->fh;
5057         data->args.stateid = &data->stateid;
5058         data->args.bitmask = server->cache_consistency_bitmask;
5059         nfs_copy_fh(&data->fh, NFS_FH(inode));
5060         nfs4_stateid_copy(&data->stateid, stateid);
5061         data->res.fattr = &data->fattr;
5062         data->res.server = server;
5063         nfs_fattr_init(data->res.fattr);
5064         data->timestamp = jiffies;
5065         data->rpc_status = 0;
5066
5067         task_setup_data.callback_data = data;
5068         msg.rpc_argp = &data->args;
5069         msg.rpc_resp = &data->res;
5070         task = rpc_run_task(&task_setup_data);
5071         if (IS_ERR(task))
5072                 return PTR_ERR(task);
5073         if (!issync)
5074                 goto out;
5075         status = nfs4_wait_for_completion_rpc_task(task);
5076         if (status != 0)
5077                 goto out;
5078         status = data->rpc_status;
5079         if (status == 0)
5080                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5081         else
5082                 nfs_refresh_inode(inode, &data->fattr);
5083 out:
5084         rpc_put_task(task);
5085         return status;
5086 }
5087
5088 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5089 {
5090         struct nfs_server *server = NFS_SERVER(inode);
5091         struct nfs4_exception exception = { };
5092         int err;
5093         do {
5094                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5095                 trace_nfs4_delegreturn(inode, err);
5096                 switch (err) {
5097                         case -NFS4ERR_STALE_STATEID:
5098                         case -NFS4ERR_EXPIRED:
5099                         case 0:
5100                                 return 0;
5101                 }
5102                 err = nfs4_handle_exception(server, err, &exception);
5103         } while (exception.retry);
5104         return err;
5105 }
5106
5107 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5108 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5109
5110 /*
5111  * sleep, with exponential backoff, and retry the LOCK operation.
5112  */
5113 static unsigned long
5114 nfs4_set_lock_task_retry(unsigned long timeout)
5115 {
5116         freezable_schedule_timeout_killable_unsafe(timeout);
5117         timeout <<= 1;
5118         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5119                 return NFS4_LOCK_MAXTIMEOUT;
5120         return timeout;
5121 }
5122
5123 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5124 {
5125         struct inode *inode = state->inode;
5126         struct nfs_server *server = NFS_SERVER(inode);
5127         struct nfs_client *clp = server->nfs_client;
5128         struct nfs_lockt_args arg = {
5129                 .fh = NFS_FH(inode),
5130                 .fl = request,
5131         };
5132         struct nfs_lockt_res res = {
5133                 .denied = request,
5134         };
5135         struct rpc_message msg = {
5136                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5137                 .rpc_argp       = &arg,
5138                 .rpc_resp       = &res,
5139                 .rpc_cred       = state->owner->so_cred,
5140         };
5141         struct nfs4_lock_state *lsp;
5142         int status;
5143
5144         arg.lock_owner.clientid = clp->cl_clientid;
5145         status = nfs4_set_lock_state(state, request);
5146         if (status != 0)
5147                 goto out;
5148         lsp = request->fl_u.nfs4_fl.owner;
5149         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5150         arg.lock_owner.s_dev = server->s_dev;
5151         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5152         switch (status) {
5153                 case 0:
5154                         request->fl_type = F_UNLCK;
5155                         break;
5156                 case -NFS4ERR_DENIED:
5157                         status = 0;
5158         }
5159         request->fl_ops->fl_release_private(request);
5160         request->fl_ops = NULL;
5161 out:
5162         return status;
5163 }
5164
5165 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5166 {
5167         struct nfs4_exception exception = { };
5168         int err;
5169
5170         do {
5171                 err = _nfs4_proc_getlk(state, cmd, request);
5172                 trace_nfs4_get_lock(request, state, cmd, err);
5173                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5174                                 &exception);
5175         } while (exception.retry);
5176         return err;
5177 }
5178
5179 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5180 {
5181         int res = 0;
5182         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5183                 case FL_POSIX:
5184                         res = posix_lock_file_wait(file, fl);
5185                         break;
5186                 case FL_FLOCK:
5187                         res = flock_lock_file_wait(file, fl);
5188                         break;
5189                 default:
5190                         BUG();
5191         }
5192         return res;
5193 }
5194
5195 struct nfs4_unlockdata {
5196         struct nfs_locku_args arg;
5197         struct nfs_locku_res res;
5198         struct nfs4_lock_state *lsp;
5199         struct nfs_open_context *ctx;
5200         struct file_lock fl;
5201         const struct nfs_server *server;
5202         unsigned long timestamp;
5203 };
5204
5205 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5206                 struct nfs_open_context *ctx,
5207                 struct nfs4_lock_state *lsp,
5208                 struct nfs_seqid *seqid)
5209 {
5210         struct nfs4_unlockdata *p;
5211         struct inode *inode = lsp->ls_state->inode;
5212
5213         p = kzalloc(sizeof(*p), GFP_NOFS);
5214         if (p == NULL)
5215                 return NULL;
5216         p->arg.fh = NFS_FH(inode);
5217         p->arg.fl = &p->fl;
5218         p->arg.seqid = seqid;
5219         p->res.seqid = seqid;
5220         p->arg.stateid = &lsp->ls_stateid;
5221         p->lsp = lsp;
5222         atomic_inc(&lsp->ls_count);
5223         /* Ensure we don't close file until we're done freeing locks! */
5224         p->ctx = get_nfs_open_context(ctx);
5225         memcpy(&p->fl, fl, sizeof(p->fl));
5226         p->server = NFS_SERVER(inode);
5227         return p;
5228 }
5229
5230 static void nfs4_locku_release_calldata(void *data)
5231 {
5232         struct nfs4_unlockdata *calldata = data;
5233         nfs_free_seqid(calldata->arg.seqid);
5234         nfs4_put_lock_state(calldata->lsp);
5235         put_nfs_open_context(calldata->ctx);
5236         kfree(calldata);
5237 }
5238
5239 static void nfs4_locku_done(struct rpc_task *task, void *data)
5240 {
5241         struct nfs4_unlockdata *calldata = data;
5242
5243         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5244                 return;
5245         switch (task->tk_status) {
5246                 case 0:
5247                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5248                                         &calldata->res.stateid);
5249                         renew_lease(calldata->server, calldata->timestamp);
5250                         break;
5251                 case -NFS4ERR_BAD_STATEID:
5252                 case -NFS4ERR_OLD_STATEID:
5253                 case -NFS4ERR_STALE_STATEID:
5254                 case -NFS4ERR_EXPIRED:
5255                         break;
5256                 default:
5257                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5258                                 rpc_restart_call_prepare(task);
5259         }
5260         nfs_release_seqid(calldata->arg.seqid);
5261 }
5262
5263 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5264 {
5265         struct nfs4_unlockdata *calldata = data;
5266
5267         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5268                 goto out_wait;
5269         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5270                 /* Note: exit _without_ running nfs4_locku_done */
5271                 goto out_no_action;
5272         }
5273         calldata->timestamp = jiffies;
5274         if (nfs4_setup_sequence(calldata->server,
5275                                 &calldata->arg.seq_args,
5276                                 &calldata->res.seq_res,
5277                                 task) != 0)
5278                 nfs_release_seqid(calldata->arg.seqid);
5279         return;
5280 out_no_action:
5281         task->tk_action = NULL;
5282 out_wait:
5283         nfs4_sequence_done(task, &calldata->res.seq_res);
5284 }
5285
5286 static const struct rpc_call_ops nfs4_locku_ops = {
5287         .rpc_call_prepare = nfs4_locku_prepare,
5288         .rpc_call_done = nfs4_locku_done,
5289         .rpc_release = nfs4_locku_release_calldata,
5290 };
5291
5292 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5293                 struct nfs_open_context *ctx,
5294                 struct nfs4_lock_state *lsp,
5295                 struct nfs_seqid *seqid)
5296 {
5297         struct nfs4_unlockdata *data;
5298         struct rpc_message msg = {
5299                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5300                 .rpc_cred = ctx->cred,
5301         };
5302         struct rpc_task_setup task_setup_data = {
5303                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5304                 .rpc_message = &msg,
5305                 .callback_ops = &nfs4_locku_ops,
5306                 .workqueue = nfsiod_workqueue,
5307                 .flags = RPC_TASK_ASYNC,
5308         };
5309
5310         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5311                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5312
5313         /* Ensure this is an unlock - when canceling a lock, the
5314          * canceled lock is passed in, and it won't be an unlock.
5315          */
5316         fl->fl_type = F_UNLCK;
5317
5318         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5319         if (data == NULL) {
5320                 nfs_free_seqid(seqid);
5321                 return ERR_PTR(-ENOMEM);
5322         }
5323
5324         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5325         msg.rpc_argp = &data->arg;
5326         msg.rpc_resp = &data->res;
5327         task_setup_data.callback_data = data;
5328         return rpc_run_task(&task_setup_data);
5329 }
5330
5331 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5332 {
5333         struct inode *inode = state->inode;
5334         struct nfs4_state_owner *sp = state->owner;
5335         struct nfs_inode *nfsi = NFS_I(inode);
5336         struct nfs_seqid *seqid;
5337         struct nfs4_lock_state *lsp;
5338         struct rpc_task *task;
5339         int status = 0;
5340         unsigned char fl_flags = request->fl_flags;
5341
5342         status = nfs4_set_lock_state(state, request);
5343         /* Unlock _before_ we do the RPC call */
5344         request->fl_flags |= FL_EXISTS;
5345         /* Exclude nfs_delegation_claim_locks() */
5346         mutex_lock(&sp->so_delegreturn_mutex);
5347         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5348         down_read(&nfsi->rwsem);
5349         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5350                 up_read(&nfsi->rwsem);
5351                 mutex_unlock(&sp->so_delegreturn_mutex);
5352                 goto out;
5353         }
5354         up_read(&nfsi->rwsem);
5355         mutex_unlock(&sp->so_delegreturn_mutex);
5356         if (status != 0)
5357                 goto out;
5358         /* Is this a delegated lock? */
5359         lsp = request->fl_u.nfs4_fl.owner;
5360         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5361                 goto out;
5362         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5363         status = -ENOMEM;
5364         if (seqid == NULL)
5365                 goto out;
5366         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5367         status = PTR_ERR(task);
5368         if (IS_ERR(task))
5369                 goto out;
5370         status = nfs4_wait_for_completion_rpc_task(task);
5371         rpc_put_task(task);
5372 out:
5373         request->fl_flags = fl_flags;
5374         trace_nfs4_unlock(request, state, F_SETLK, status);
5375         return status;
5376 }
5377
5378 struct nfs4_lockdata {
5379         struct nfs_lock_args arg;
5380         struct nfs_lock_res res;
5381         struct nfs4_lock_state *lsp;
5382         struct nfs_open_context *ctx;
5383         struct file_lock fl;
5384         unsigned long timestamp;
5385         int rpc_status;
5386         int cancelled;
5387         struct nfs_server *server;
5388 };
5389
5390 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5391                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5392                 gfp_t gfp_mask)
5393 {
5394         struct nfs4_lockdata *p;
5395         struct inode *inode = lsp->ls_state->inode;
5396         struct nfs_server *server = NFS_SERVER(inode);
5397
5398         p = kzalloc(sizeof(*p), gfp_mask);
5399         if (p == NULL)
5400                 return NULL;
5401
5402         p->arg.fh = NFS_FH(inode);
5403         p->arg.fl = &p->fl;
5404         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5405         if (p->arg.open_seqid == NULL)
5406                 goto out_free;
5407         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5408         if (p->arg.lock_seqid == NULL)
5409                 goto out_free_seqid;
5410         p->arg.lock_stateid = &lsp->ls_stateid;
5411         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5412         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5413         p->arg.lock_owner.s_dev = server->s_dev;
5414         p->res.lock_seqid = p->arg.lock_seqid;
5415         p->lsp = lsp;
5416         p->server = server;
5417         atomic_inc(&lsp->ls_count);
5418         p->ctx = get_nfs_open_context(ctx);
5419         memcpy(&p->fl, fl, sizeof(p->fl));
5420         return p;
5421 out_free_seqid:
5422         nfs_free_seqid(p->arg.open_seqid);
5423 out_free:
5424         kfree(p);
5425         return NULL;
5426 }
5427
5428 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5429 {
5430         struct nfs4_lockdata *data = calldata;
5431         struct nfs4_state *state = data->lsp->ls_state;
5432
5433         dprintk("%s: begin!\n", __func__);
5434         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5435                 goto out_wait;
5436         /* Do we need to do an open_to_lock_owner? */
5437         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5438                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5439                         goto out_release_lock_seqid;
5440                 }
5441                 data->arg.open_stateid = &state->open_stateid;
5442                 data->arg.new_lock_owner = 1;
5443                 data->res.open_seqid = data->arg.open_seqid;
5444         } else
5445                 data->arg.new_lock_owner = 0;
5446         if (!nfs4_valid_open_stateid(state)) {
5447                 data->rpc_status = -EBADF;
5448                 task->tk_action = NULL;
5449                 goto out_release_open_seqid;
5450         }
5451         data->timestamp = jiffies;
5452         if (nfs4_setup_sequence(data->server,
5453                                 &data->arg.seq_args,
5454                                 &data->res.seq_res,
5455                                 task) == 0)
5456                 return;
5457 out_release_open_seqid:
5458         nfs_release_seqid(data->arg.open_seqid);
5459 out_release_lock_seqid:
5460         nfs_release_seqid(data->arg.lock_seqid);
5461 out_wait:
5462         nfs4_sequence_done(task, &data->res.seq_res);
5463         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5464 }
5465
5466 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5467 {
5468         struct nfs4_lockdata *data = calldata;
5469
5470         dprintk("%s: begin!\n", __func__);
5471
5472         if (!nfs4_sequence_done(task, &data->res.seq_res))
5473                 return;
5474
5475         data->rpc_status = task->tk_status;
5476         if (data->arg.new_lock_owner != 0) {
5477                 if (data->rpc_status == 0)
5478                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5479                 else
5480                         goto out;
5481         }
5482         if (data->rpc_status == 0) {
5483                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5484                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5485                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5486         }
5487 out:
5488         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5489 }
5490
5491 static void nfs4_lock_release(void *calldata)
5492 {
5493         struct nfs4_lockdata *data = calldata;
5494
5495         dprintk("%s: begin!\n", __func__);
5496         nfs_free_seqid(data->arg.open_seqid);
5497         if (data->cancelled != 0) {
5498                 struct rpc_task *task;
5499                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5500                                 data->arg.lock_seqid);
5501                 if (!IS_ERR(task))
5502                         rpc_put_task_async(task);
5503                 dprintk("%s: cancelling lock!\n", __func__);
5504         } else
5505                 nfs_free_seqid(data->arg.lock_seqid);
5506         nfs4_put_lock_state(data->lsp);
5507         put_nfs_open_context(data->ctx);
5508         kfree(data);
5509         dprintk("%s: done!\n", __func__);
5510 }
5511
5512 static const struct rpc_call_ops nfs4_lock_ops = {
5513         .rpc_call_prepare = nfs4_lock_prepare,
5514         .rpc_call_done = nfs4_lock_done,
5515         .rpc_release = nfs4_lock_release,
5516 };
5517
5518 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5519 {
5520         switch (error) {
5521         case -NFS4ERR_ADMIN_REVOKED:
5522         case -NFS4ERR_BAD_STATEID:
5523                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5524                 if (new_lock_owner != 0 ||
5525                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5526                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5527                 break;
5528         case -NFS4ERR_STALE_STATEID:
5529                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5530         case -NFS4ERR_EXPIRED:
5531                 nfs4_schedule_lease_recovery(server->nfs_client);
5532         };
5533 }
5534
5535 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5536 {
5537         struct nfs4_lockdata *data;
5538         struct rpc_task *task;
5539         struct rpc_message msg = {
5540                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5541                 .rpc_cred = state->owner->so_cred,
5542         };
5543         struct rpc_task_setup task_setup_data = {
5544                 .rpc_client = NFS_CLIENT(state->inode),
5545                 .rpc_message = &msg,
5546                 .callback_ops = &nfs4_lock_ops,
5547                 .workqueue = nfsiod_workqueue,
5548                 .flags = RPC_TASK_ASYNC,
5549         };
5550         int ret;
5551
5552         dprintk("%s: begin!\n", __func__);
5553         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5554                         fl->fl_u.nfs4_fl.owner,
5555                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5556         if (data == NULL)
5557                 return -ENOMEM;
5558         if (IS_SETLKW(cmd))
5559                 data->arg.block = 1;
5560         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5561         msg.rpc_argp = &data->arg;
5562         msg.rpc_resp = &data->res;
5563         task_setup_data.callback_data = data;
5564         if (recovery_type > NFS_LOCK_NEW) {
5565                 if (recovery_type == NFS_LOCK_RECLAIM)
5566                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5567                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5568         }
5569         task = rpc_run_task(&task_setup_data);
5570         if (IS_ERR(task))
5571                 return PTR_ERR(task);
5572         ret = nfs4_wait_for_completion_rpc_task(task);
5573         if (ret == 0) {
5574                 ret = data->rpc_status;
5575                 if (ret)
5576                         nfs4_handle_setlk_error(data->server, data->lsp,
5577                                         data->arg.new_lock_owner, ret);
5578         } else
5579                 data->cancelled = 1;
5580         rpc_put_task(task);
5581         dprintk("%s: done, ret = %d!\n", __func__, ret);
5582         return ret;
5583 }
5584
5585 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5586 {
5587         struct nfs_server *server = NFS_SERVER(state->inode);
5588         struct nfs4_exception exception = {
5589                 .inode = state->inode,
5590         };
5591         int err;
5592
5593         do {
5594                 /* Cache the lock if possible... */
5595                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5596                         return 0;
5597                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5598                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5599                 if (err != -NFS4ERR_DELAY)
5600                         break;
5601                 nfs4_handle_exception(server, err, &exception);
5602         } while (exception.retry);
5603         return err;
5604 }
5605
5606 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5607 {
5608         struct nfs_server *server = NFS_SERVER(state->inode);
5609         struct nfs4_exception exception = {
5610                 .inode = state->inode,
5611         };
5612         int err;
5613
5614         err = nfs4_set_lock_state(state, request);
5615         if (err != 0)
5616                 return err;
5617         if (!recover_lost_locks) {
5618                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5619                 return 0;
5620         }
5621         do {
5622                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5623                         return 0;
5624                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5625                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5626                 switch (err) {
5627                 default:
5628                         goto out;
5629                 case -NFS4ERR_GRACE:
5630                 case -NFS4ERR_DELAY:
5631                         nfs4_handle_exception(server, err, &exception);
5632                         err = 0;
5633                 }
5634         } while (exception.retry);
5635 out:
5636         return err;
5637 }
5638
5639 #if defined(CONFIG_NFS_V4_1)
5640 /**
5641  * nfs41_check_expired_locks - possibly free a lock stateid
5642  *
5643  * @state: NFSv4 state for an inode
5644  *
5645  * Returns NFS_OK if recovery for this stateid is now finished.
5646  * Otherwise a negative NFS4ERR value is returned.
5647  */
5648 static int nfs41_check_expired_locks(struct nfs4_state *state)
5649 {
5650         int status, ret = -NFS4ERR_BAD_STATEID;
5651         struct nfs4_lock_state *lsp;
5652         struct nfs_server *server = NFS_SERVER(state->inode);
5653
5654         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5655                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5656                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5657
5658                         status = nfs41_test_stateid(server,
5659                                         &lsp->ls_stateid,
5660                                         cred);
5661                         trace_nfs4_test_lock_stateid(state, lsp, status);
5662                         if (status != NFS_OK) {
5663                                 /* Free the stateid unless the server
5664                                  * informs us the stateid is unrecognized. */
5665                                 if (status != -NFS4ERR_BAD_STATEID)
5666                                         nfs41_free_stateid(server,
5667                                                         &lsp->ls_stateid,
5668                                                         cred);
5669                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5670                                 ret = status;
5671                         }
5672                 }
5673         };
5674
5675         return ret;
5676 }
5677
5678 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5679 {
5680         int status = NFS_OK;
5681
5682         if (test_bit(LK_STATE_IN_USE, &state->flags))
5683                 status = nfs41_check_expired_locks(state);
5684         if (status != NFS_OK)
5685                 status = nfs4_lock_expired(state, request);
5686         return status;
5687 }
5688 #endif
5689
5690 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5691 {
5692         struct nfs4_state_owner *sp = state->owner;
5693         struct nfs_inode *nfsi = NFS_I(state->inode);
5694         unsigned char fl_flags = request->fl_flags;
5695         unsigned int seq;
5696         int status = -ENOLCK;
5697
5698         if ((fl_flags & FL_POSIX) &&
5699                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5700                 goto out;
5701         /* Is this a delegated open? */
5702         status = nfs4_set_lock_state(state, request);
5703         if (status != 0)
5704                 goto out;
5705         request->fl_flags |= FL_ACCESS;
5706         status = do_vfs_lock(request->fl_file, request);
5707         if (status < 0)
5708                 goto out;
5709         down_read(&nfsi->rwsem);
5710         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5711                 /* Yes: cache locks! */
5712                 /* ...but avoid races with delegation recall... */
5713                 request->fl_flags = fl_flags & ~FL_SLEEP;
5714                 status = do_vfs_lock(request->fl_file, request);
5715                 goto out_unlock;
5716         }
5717         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5718         up_read(&nfsi->rwsem);
5719         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5720         if (status != 0)
5721                 goto out;
5722         down_read(&nfsi->rwsem);
5723         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5724                 status = -NFS4ERR_DELAY;
5725                 goto out_unlock;
5726         }
5727         /* Note: we always want to sleep here! */
5728         request->fl_flags = fl_flags | FL_SLEEP;
5729         if (do_vfs_lock(request->fl_file, request) < 0)
5730                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5731                         "manager!\n", __func__);
5732 out_unlock:
5733         up_read(&nfsi->rwsem);
5734 out:
5735         request->fl_flags = fl_flags;
5736         return status;
5737 }
5738
5739 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5740 {
5741         struct nfs4_exception exception = {
5742                 .state = state,
5743                 .inode = state->inode,
5744         };
5745         int err;
5746
5747         do {
5748                 err = _nfs4_proc_setlk(state, cmd, request);
5749                 trace_nfs4_set_lock(request, state, cmd, err);
5750                 if (err == -NFS4ERR_DENIED)
5751                         err = -EAGAIN;
5752                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5753                                 err, &exception);
5754         } while (exception.retry);
5755         return err;
5756 }
5757
5758 static int
5759 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5760 {
5761         struct nfs_open_context *ctx;
5762         struct nfs4_state *state;
5763         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5764         int status;
5765
5766         /* verify open state */
5767         ctx = nfs_file_open_context(filp);
5768         state = ctx->state;
5769
5770         if (request->fl_start < 0 || request->fl_end < 0)
5771                 return -EINVAL;
5772
5773         if (IS_GETLK(cmd)) {
5774                 if (state != NULL)
5775                         return nfs4_proc_getlk(state, F_GETLK, request);
5776                 return 0;
5777         }
5778
5779         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5780                 return -EINVAL;
5781
5782         if (request->fl_type == F_UNLCK) {
5783                 if (state != NULL)
5784                         return nfs4_proc_unlck(state, cmd, request);
5785                 return 0;
5786         }
5787
5788         if (state == NULL)
5789                 return -ENOLCK;
5790         /*
5791          * Don't rely on the VFS having checked the file open mode,
5792          * since it won't do this for flock() locks.
5793          */
5794         switch (request->fl_type) {
5795         case F_RDLCK:
5796                 if (!(filp->f_mode & FMODE_READ))
5797                         return -EBADF;
5798                 break;
5799         case F_WRLCK:
5800                 if (!(filp->f_mode & FMODE_WRITE))
5801                         return -EBADF;
5802         }
5803
5804         do {
5805                 status = nfs4_proc_setlk(state, cmd, request);
5806                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5807                         break;
5808                 timeout = nfs4_set_lock_task_retry(timeout);
5809                 status = -ERESTARTSYS;
5810                 if (signalled())
5811                         break;
5812         } while(status < 0);
5813         return status;
5814 }
5815
5816 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5817 {
5818         struct nfs_server *server = NFS_SERVER(state->inode);
5819         int err;
5820
5821         err = nfs4_set_lock_state(state, fl);
5822         if (err != 0)
5823                 return err;
5824         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5825         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5826 }
5827
5828 struct nfs_release_lockowner_data {
5829         struct nfs4_lock_state *lsp;
5830         struct nfs_server *server;
5831         struct nfs_release_lockowner_args args;
5832         struct nfs4_sequence_args seq_args;
5833         struct nfs4_sequence_res seq_res;
5834         unsigned long timestamp;
5835 };
5836
5837 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5838 {
5839         struct nfs_release_lockowner_data *data = calldata;
5840         nfs40_setup_sequence(data->server,
5841                                 &data->seq_args, &data->seq_res, task);
5842         data->timestamp = jiffies;
5843 }
5844
5845 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5846 {
5847         struct nfs_release_lockowner_data *data = calldata;
5848         struct nfs_server *server = data->server;
5849
5850         nfs40_sequence_done(task, &data->seq_res);
5851
5852         switch (task->tk_status) {
5853         case 0:
5854                 renew_lease(server, data->timestamp);
5855                 break;
5856         case -NFS4ERR_STALE_CLIENTID:
5857         case -NFS4ERR_EXPIRED:
5858         case -NFS4ERR_LEASE_MOVED:
5859         case -NFS4ERR_DELAY:
5860                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5861                         rpc_restart_call_prepare(task);
5862         }
5863 }
5864
5865 static void nfs4_release_lockowner_release(void *calldata)
5866 {
5867         struct nfs_release_lockowner_data *data = calldata;
5868         nfs4_free_lock_state(data->server, data->lsp);
5869         kfree(calldata);
5870 }
5871
5872 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5873         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5874         .rpc_call_done = nfs4_release_lockowner_done,
5875         .rpc_release = nfs4_release_lockowner_release,
5876 };
5877
5878 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5879 {
5880         struct nfs_release_lockowner_data *data;
5881         struct rpc_message msg = {
5882                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5883         };
5884
5885         if (server->nfs_client->cl_mvops->minor_version != 0)
5886                 return -EINVAL;
5887
5888         data = kmalloc(sizeof(*data), GFP_NOFS);
5889         if (!data)
5890                 return -ENOMEM;
5891         nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5892         data->lsp = lsp;
5893         data->server = server;
5894         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5895         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5896         data->args.lock_owner.s_dev = server->s_dev;
5897
5898         msg.rpc_argp = &data->args;
5899         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5900         return 0;
5901 }
5902
5903 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5904
5905 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5906                                    const void *buf, size_t buflen,
5907                                    int flags, int type)
5908 {
5909         if (strcmp(key, "") != 0)
5910                 return -EINVAL;
5911
5912         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5913 }
5914
5915 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5916                                    void *buf, size_t buflen, int type)
5917 {
5918         if (strcmp(key, "") != 0)
5919                 return -EINVAL;
5920
5921         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5922 }
5923
5924 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5925                                        size_t list_len, const char *name,
5926                                        size_t name_len, int type)
5927 {
5928         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5929
5930         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5931                 return 0;
5932
5933         if (list && len <= list_len)
5934                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5935         return len;
5936 }
5937
5938 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5939 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5940 {
5941         return server->caps & NFS_CAP_SECURITY_LABEL;
5942 }
5943
5944 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5945                                    const void *buf, size_t buflen,
5946                                    int flags, int type)
5947 {
5948         if (security_ismaclabel(key))
5949                 return nfs4_set_security_label(dentry, buf, buflen);
5950
5951         return -EOPNOTSUPP;
5952 }
5953
5954 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5955                                    void *buf, size_t buflen, int type)
5956 {
5957         if (security_ismaclabel(key))
5958                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5959         return -EOPNOTSUPP;
5960 }
5961
5962 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5963                                        size_t list_len, const char *name,
5964                                        size_t name_len, int type)
5965 {
5966         size_t len = 0;
5967
5968         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5969                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5970                 if (list && len <= list_len)
5971                         security_inode_listsecurity(dentry->d_inode, list, len);
5972         }
5973         return len;
5974 }
5975
5976 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5977         .prefix = XATTR_SECURITY_PREFIX,
5978         .list   = nfs4_xattr_list_nfs4_label,
5979         .get    = nfs4_xattr_get_nfs4_label,
5980         .set    = nfs4_xattr_set_nfs4_label,
5981 };
5982 #endif
5983
5984
5985 /*
5986  * nfs_fhget will use either the mounted_on_fileid or the fileid
5987  */
5988 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5989 {
5990         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5991                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5992               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5993               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5994                 return;
5995
5996         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5997                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5998         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5999         fattr->nlink = 2;
6000 }
6001
6002 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6003                                    const struct qstr *name,
6004                                    struct nfs4_fs_locations *fs_locations,
6005                                    struct page *page)
6006 {
6007         struct nfs_server *server = NFS_SERVER(dir);
6008         u32 bitmask[3] = {
6009                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6010         };
6011         struct nfs4_fs_locations_arg args = {
6012                 .dir_fh = NFS_FH(dir),
6013                 .name = name,
6014                 .page = page,
6015                 .bitmask = bitmask,
6016         };
6017         struct nfs4_fs_locations_res res = {
6018                 .fs_locations = fs_locations,
6019         };
6020         struct rpc_message msg = {
6021                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6022                 .rpc_argp = &args,
6023                 .rpc_resp = &res,
6024         };
6025         int status;
6026
6027         dprintk("%s: start\n", __func__);
6028
6029         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6030          * is not supported */
6031         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6032                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6033         else
6034                 bitmask[0] |= FATTR4_WORD0_FILEID;
6035
6036         nfs_fattr_init(&fs_locations->fattr);
6037         fs_locations->server = server;
6038         fs_locations->nlocations = 0;
6039         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6040         dprintk("%s: returned status = %d\n", __func__, status);
6041         return status;
6042 }
6043
6044 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6045                            const struct qstr *name,
6046                            struct nfs4_fs_locations *fs_locations,
6047                            struct page *page)
6048 {
6049         struct nfs4_exception exception = { };
6050         int err;
6051         do {
6052                 err = _nfs4_proc_fs_locations(client, dir, name,
6053                                 fs_locations, page);
6054                 trace_nfs4_get_fs_locations(dir, name, err);
6055                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6056                                 &exception);
6057         } while (exception.retry);
6058         return err;
6059 }
6060
6061 /*
6062  * This operation also signals the server that this client is
6063  * performing migration recovery.  The server can stop returning
6064  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6065  * appended to this compound to identify the client ID which is
6066  * performing recovery.
6067  */
6068 static int _nfs40_proc_get_locations(struct inode *inode,
6069                                      struct nfs4_fs_locations *locations,
6070                                      struct page *page, struct rpc_cred *cred)
6071 {
6072         struct nfs_server *server = NFS_SERVER(inode);
6073         struct rpc_clnt *clnt = server->client;
6074         u32 bitmask[2] = {
6075                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6076         };
6077         struct nfs4_fs_locations_arg args = {
6078                 .clientid       = server->nfs_client->cl_clientid,
6079                 .fh             = NFS_FH(inode),
6080                 .page           = page,
6081                 .bitmask        = bitmask,
6082                 .migration      = 1,            /* skip LOOKUP */
6083                 .renew          = 1,            /* append RENEW */
6084         };
6085         struct nfs4_fs_locations_res res = {
6086                 .fs_locations   = locations,
6087                 .migration      = 1,
6088                 .renew          = 1,
6089         };
6090         struct rpc_message msg = {
6091                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6092                 .rpc_argp       = &args,
6093                 .rpc_resp       = &res,
6094                 .rpc_cred       = cred,
6095         };
6096         unsigned long now = jiffies;
6097         int status;
6098
6099         nfs_fattr_init(&locations->fattr);
6100         locations->server = server;
6101         locations->nlocations = 0;
6102
6103         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6104         nfs4_set_sequence_privileged(&args.seq_args);
6105         status = nfs4_call_sync_sequence(clnt, server, &msg,
6106                                         &args.seq_args, &res.seq_res);
6107         if (status)
6108                 return status;
6109
6110         renew_lease(server, now);
6111         return 0;
6112 }
6113
6114 #ifdef CONFIG_NFS_V4_1
6115
6116 /*
6117  * This operation also signals the server that this client is
6118  * performing migration recovery.  The server can stop asserting
6119  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6120  * performing this operation is identified in the SEQUENCE
6121  * operation in this compound.
6122  *
6123  * When the client supports GETATTR(fs_locations_info), it can
6124  * be plumbed in here.
6125  */
6126 static int _nfs41_proc_get_locations(struct inode *inode,
6127                                      struct nfs4_fs_locations *locations,
6128                                      struct page *page, struct rpc_cred *cred)
6129 {
6130         struct nfs_server *server = NFS_SERVER(inode);
6131         struct rpc_clnt *clnt = server->client;
6132         u32 bitmask[2] = {
6133                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6134         };
6135         struct nfs4_fs_locations_arg args = {
6136                 .fh             = NFS_FH(inode),
6137                 .page           = page,
6138                 .bitmask        = bitmask,
6139                 .migration      = 1,            /* skip LOOKUP */
6140         };
6141         struct nfs4_fs_locations_res res = {
6142                 .fs_locations   = locations,
6143                 .migration      = 1,
6144         };
6145         struct rpc_message msg = {
6146                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6147                 .rpc_argp       = &args,
6148                 .rpc_resp       = &res,
6149                 .rpc_cred       = cred,
6150         };
6151         int status;
6152
6153         nfs_fattr_init(&locations->fattr);
6154         locations->server = server;
6155         locations->nlocations = 0;
6156
6157         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6158         nfs4_set_sequence_privileged(&args.seq_args);
6159         status = nfs4_call_sync_sequence(clnt, server, &msg,
6160                                         &args.seq_args, &res.seq_res);
6161         if (status == NFS4_OK &&
6162             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6163                 status = -NFS4ERR_LEASE_MOVED;
6164         return status;
6165 }
6166
6167 #endif  /* CONFIG_NFS_V4_1 */
6168
6169 /**
6170  * nfs4_proc_get_locations - discover locations for a migrated FSID
6171  * @inode: inode on FSID that is migrating
6172  * @locations: result of query
6173  * @page: buffer
6174  * @cred: credential to use for this operation
6175  *
6176  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6177  * operation failed, or a negative errno if a local error occurred.
6178  *
6179  * On success, "locations" is filled in, but if the server has
6180  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6181  * asserted.
6182  *
6183  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6184  * from this client that require migration recovery.
6185  */
6186 int nfs4_proc_get_locations(struct inode *inode,
6187                             struct nfs4_fs_locations *locations,
6188                             struct page *page, struct rpc_cred *cred)
6189 {
6190         struct nfs_server *server = NFS_SERVER(inode);
6191         struct nfs_client *clp = server->nfs_client;
6192         const struct nfs4_mig_recovery_ops *ops =
6193                                         clp->cl_mvops->mig_recovery_ops;
6194         struct nfs4_exception exception = { };
6195         int status;
6196
6197         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6198                 (unsigned long long)server->fsid.major,
6199                 (unsigned long long)server->fsid.minor,
6200                 clp->cl_hostname);
6201         nfs_display_fhandle(NFS_FH(inode), __func__);
6202
6203         do {
6204                 status = ops->get_locations(inode, locations, page, cred);
6205                 if (status != -NFS4ERR_DELAY)
6206                         break;
6207                 nfs4_handle_exception(server, status, &exception);
6208         } while (exception.retry);
6209         return status;
6210 }
6211
6212 /*
6213  * This operation also signals the server that this client is
6214  * performing "lease moved" recovery.  The server can stop
6215  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6216  * is appended to this compound to identify the client ID which is
6217  * performing recovery.
6218  */
6219 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6220 {
6221         struct nfs_server *server = NFS_SERVER(inode);
6222         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6223         struct rpc_clnt *clnt = server->client;
6224         struct nfs4_fsid_present_arg args = {
6225                 .fh             = NFS_FH(inode),
6226                 .clientid       = clp->cl_clientid,
6227                 .renew          = 1,            /* append RENEW */
6228         };
6229         struct nfs4_fsid_present_res res = {
6230                 .renew          = 1,
6231         };
6232         struct rpc_message msg = {
6233                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6234                 .rpc_argp       = &args,
6235                 .rpc_resp       = &res,
6236                 .rpc_cred       = cred,
6237         };
6238         unsigned long now = jiffies;
6239         int status;
6240
6241         res.fh = nfs_alloc_fhandle();
6242         if (res.fh == NULL)
6243                 return -ENOMEM;
6244
6245         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6246         nfs4_set_sequence_privileged(&args.seq_args);
6247         status = nfs4_call_sync_sequence(clnt, server, &msg,
6248                                                 &args.seq_args, &res.seq_res);
6249         nfs_free_fhandle(res.fh);
6250         if (status)
6251                 return status;
6252
6253         do_renew_lease(clp, now);
6254         return 0;
6255 }
6256
6257 #ifdef CONFIG_NFS_V4_1
6258
6259 /*
6260  * This operation also signals the server that this client is
6261  * performing "lease moved" recovery.  The server can stop asserting
6262  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6263  * this operation is identified in the SEQUENCE operation in this
6264  * compound.
6265  */
6266 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6267 {
6268         struct nfs_server *server = NFS_SERVER(inode);
6269         struct rpc_clnt *clnt = server->client;
6270         struct nfs4_fsid_present_arg args = {
6271                 .fh             = NFS_FH(inode),
6272         };
6273         struct nfs4_fsid_present_res res = {
6274         };
6275         struct rpc_message msg = {
6276                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6277                 .rpc_argp       = &args,
6278                 .rpc_resp       = &res,
6279                 .rpc_cred       = cred,
6280         };
6281         int status;
6282
6283         res.fh = nfs_alloc_fhandle();
6284         if (res.fh == NULL)
6285                 return -ENOMEM;
6286
6287         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6288         nfs4_set_sequence_privileged(&args.seq_args);
6289         status = nfs4_call_sync_sequence(clnt, server, &msg,
6290                                                 &args.seq_args, &res.seq_res);
6291         nfs_free_fhandle(res.fh);
6292         if (status == NFS4_OK &&
6293             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6294                 status = -NFS4ERR_LEASE_MOVED;
6295         return status;
6296 }
6297
6298 #endif  /* CONFIG_NFS_V4_1 */
6299
6300 /**
6301  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6302  * @inode: inode on FSID to check
6303  * @cred: credential to use for this operation
6304  *
6305  * Server indicates whether the FSID is present, moved, or not
6306  * recognized.  This operation is necessary to clear a LEASE_MOVED
6307  * condition for this client ID.
6308  *
6309  * Returns NFS4_OK if the FSID is present on this server,
6310  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6311  *  NFS4ERR code if some error occurred on the server, or a
6312  *  negative errno if a local failure occurred.
6313  */
6314 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6315 {
6316         struct nfs_server *server = NFS_SERVER(inode);
6317         struct nfs_client *clp = server->nfs_client;
6318         const struct nfs4_mig_recovery_ops *ops =
6319                                         clp->cl_mvops->mig_recovery_ops;
6320         struct nfs4_exception exception = { };
6321         int status;
6322
6323         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6324                 (unsigned long long)server->fsid.major,
6325                 (unsigned long long)server->fsid.minor,
6326                 clp->cl_hostname);
6327         nfs_display_fhandle(NFS_FH(inode), __func__);
6328
6329         do {
6330                 status = ops->fsid_present(inode, cred);
6331                 if (status != -NFS4ERR_DELAY)
6332                         break;
6333                 nfs4_handle_exception(server, status, &exception);
6334         } while (exception.retry);
6335         return status;
6336 }
6337
6338 /**
6339  * If 'use_integrity' is true and the state managment nfs_client
6340  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6341  * and the machine credential as per RFC3530bis and RFC5661 Security
6342  * Considerations sections. Otherwise, just use the user cred with the
6343  * filesystem's rpc_client.
6344  */
6345 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6346 {
6347         int status;
6348         struct nfs4_secinfo_arg args = {
6349                 .dir_fh = NFS_FH(dir),
6350                 .name   = name,
6351         };
6352         struct nfs4_secinfo_res res = {
6353                 .flavors     = flavors,
6354         };
6355         struct rpc_message msg = {
6356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6357                 .rpc_argp = &args,
6358                 .rpc_resp = &res,
6359         };
6360         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6361         struct rpc_cred *cred = NULL;
6362
6363         if (use_integrity) {
6364                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6365                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6366                 msg.rpc_cred = cred;
6367         }
6368
6369         dprintk("NFS call  secinfo %s\n", name->name);
6370
6371         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6372                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6373
6374         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6375                                 &res.seq_res, 0);
6376         dprintk("NFS reply  secinfo: %d\n", status);
6377
6378         if (cred)
6379                 put_rpccred(cred);
6380
6381         return status;
6382 }
6383
6384 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6385                       struct nfs4_secinfo_flavors *flavors)
6386 {
6387         struct nfs4_exception exception = { };
6388         int err;
6389         do {
6390                 err = -NFS4ERR_WRONGSEC;
6391
6392                 /* try to use integrity protection with machine cred */
6393                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6394                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6395
6396                 /*
6397                  * if unable to use integrity protection, or SECINFO with
6398                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6399                  * disallowed by spec, but exists in deployed servers) use
6400                  * the current filesystem's rpc_client and the user cred.
6401                  */
6402                 if (err == -NFS4ERR_WRONGSEC)
6403                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6404
6405                 trace_nfs4_secinfo(dir, name, err);
6406                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6407                                 &exception);
6408         } while (exception.retry);
6409         return err;
6410 }
6411
6412 #ifdef CONFIG_NFS_V4_1
6413 /*
6414  * Check the exchange flags returned by the server for invalid flags, having
6415  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6416  * DS flags set.
6417  */
6418 static int nfs4_check_cl_exchange_flags(u32 flags)
6419 {
6420         if (flags & ~EXCHGID4_FLAG_MASK_R)
6421                 goto out_inval;
6422         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6423             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6424                 goto out_inval;
6425         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6426                 goto out_inval;
6427         return NFS_OK;
6428 out_inval:
6429         return -NFS4ERR_INVAL;
6430 }
6431
6432 static bool
6433 nfs41_same_server_scope(struct nfs41_server_scope *a,
6434                         struct nfs41_server_scope *b)
6435 {
6436         if (a->server_scope_sz == b->server_scope_sz &&
6437             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6438                 return true;
6439
6440         return false;
6441 }
6442
6443 /*
6444  * nfs4_proc_bind_conn_to_session()
6445  *
6446  * The 4.1 client currently uses the same TCP connection for the
6447  * fore and backchannel.
6448  */
6449 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6450 {
6451         int status;
6452         struct nfs41_bind_conn_to_session_res res;
6453         struct rpc_message msg = {
6454                 .rpc_proc =
6455                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6456                 .rpc_argp = clp,
6457                 .rpc_resp = &res,
6458                 .rpc_cred = cred,
6459         };
6460
6461         dprintk("--> %s\n", __func__);
6462
6463         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6464         if (unlikely(res.session == NULL)) {
6465                 status = -ENOMEM;
6466                 goto out;
6467         }
6468
6469         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6470         trace_nfs4_bind_conn_to_session(clp, status);
6471         if (status == 0) {
6472                 if (memcmp(res.session->sess_id.data,
6473                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6474                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6475                         status = -EIO;
6476                         goto out_session;
6477                 }
6478                 if (res.dir != NFS4_CDFS4_BOTH) {
6479                         dprintk("NFS: %s: Unexpected direction from server\n",
6480                                 __func__);
6481                         status = -EIO;
6482                         goto out_session;
6483                 }
6484                 if (res.use_conn_in_rdma_mode) {
6485                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6486                                 __func__);
6487                         status = -EIO;
6488                         goto out_session;
6489                 }
6490         }
6491 out_session:
6492         kfree(res.session);
6493 out:
6494         dprintk("<-- %s status= %d\n", __func__, status);
6495         return status;
6496 }
6497
6498 /*
6499  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6500  * and operations we'd like to see to enable certain features in the allow map
6501  */
6502 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6503         .how = SP4_MACH_CRED,
6504         .enforce.u.words = {
6505                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6506                       1 << (OP_EXCHANGE_ID - 32) |
6507                       1 << (OP_CREATE_SESSION - 32) |
6508                       1 << (OP_DESTROY_SESSION - 32) |
6509                       1 << (OP_DESTROY_CLIENTID - 32)
6510         },
6511         .allow.u.words = {
6512                 [0] = 1 << (OP_CLOSE) |
6513                       1 << (OP_LOCKU) |
6514                       1 << (OP_COMMIT),
6515                 [1] = 1 << (OP_SECINFO - 32) |
6516                       1 << (OP_SECINFO_NO_NAME - 32) |
6517                       1 << (OP_TEST_STATEID - 32) |
6518                       1 << (OP_FREE_STATEID - 32) |
6519                       1 << (OP_WRITE - 32)
6520         }
6521 };
6522
6523 /*
6524  * Select the state protection mode for client `clp' given the server results
6525  * from exchange_id in `sp'.
6526  *
6527  * Returns 0 on success, negative errno otherwise.
6528  */
6529 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6530                                  struct nfs41_state_protection *sp)
6531 {
6532         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6533                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6534                       1 << (OP_EXCHANGE_ID - 32) |
6535                       1 << (OP_CREATE_SESSION - 32) |
6536                       1 << (OP_DESTROY_SESSION - 32) |
6537                       1 << (OP_DESTROY_CLIENTID - 32)
6538         };
6539         unsigned int i;
6540
6541         if (sp->how == SP4_MACH_CRED) {
6542                 /* Print state protect result */
6543                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6544                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6545                         if (test_bit(i, sp->enforce.u.longs))
6546                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6547                         if (test_bit(i, sp->allow.u.longs))
6548                                 dfprintk(MOUNT, "  allow op %d\n", i);
6549                 }
6550
6551                 /* make sure nothing is on enforce list that isn't supported */
6552                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6553                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6554                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6555                                 return -EINVAL;
6556                         }
6557                 }
6558
6559                 /*
6560                  * Minimal mode - state operations are allowed to use machine
6561                  * credential.  Note this already happens by default, so the
6562                  * client doesn't have to do anything more than the negotiation.
6563                  *
6564                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6565                  *       we're already using the machine cred for exchange_id
6566                  *       and will never use a different cred.
6567                  */
6568                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6569                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6570                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6571                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6572                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6573                         dfprintk(MOUNT, "  minimal mode enabled\n");
6574                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6575                 } else {
6576                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6577                         return -EINVAL;
6578                 }
6579
6580                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6581                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6582                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6583                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6584                 }
6585
6586                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6587                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6588                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6589                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6590                 }
6591
6592                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6593                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6594                         dfprintk(MOUNT, "  stateid mode enabled\n");
6595                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6596                 }
6597
6598                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6599                         dfprintk(MOUNT, "  write mode enabled\n");
6600                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6601                 }
6602
6603                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6604                         dfprintk(MOUNT, "  commit mode enabled\n");
6605                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6606                 }
6607         }
6608
6609         return 0;
6610 }
6611
6612 /*
6613  * _nfs4_proc_exchange_id()
6614  *
6615  * Wrapper for EXCHANGE_ID operation.
6616  */
6617 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6618         u32 sp4_how)
6619 {
6620         nfs4_verifier verifier;
6621         struct nfs41_exchange_id_args args = {
6622                 .verifier = &verifier,
6623                 .client = clp,
6624 #ifdef CONFIG_NFS_V4_1_MIGRATION
6625                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6626                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6627                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6628 #else
6629                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6630                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6631 #endif
6632         };
6633         struct nfs41_exchange_id_res res = {
6634                 0
6635         };
6636         int status;
6637         struct rpc_message msg = {
6638                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6639                 .rpc_argp = &args,
6640                 .rpc_resp = &res,
6641                 .rpc_cred = cred,
6642         };
6643
6644         nfs4_init_boot_verifier(clp, &verifier);
6645         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6646                                                         sizeof(args.id));
6647         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6648                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6649                 args.id_len, args.id);
6650
6651         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6652                                         GFP_NOFS);
6653         if (unlikely(res.server_owner == NULL)) {
6654                 status = -ENOMEM;
6655                 goto out;
6656         }
6657
6658         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6659                                         GFP_NOFS);
6660         if (unlikely(res.server_scope == NULL)) {
6661                 status = -ENOMEM;
6662                 goto out_server_owner;
6663         }
6664
6665         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6666         if (unlikely(res.impl_id == NULL)) {
6667                 status = -ENOMEM;
6668                 goto out_server_scope;
6669         }
6670
6671         switch (sp4_how) {
6672         case SP4_NONE:
6673                 args.state_protect.how = SP4_NONE;
6674                 break;
6675
6676         case SP4_MACH_CRED:
6677                 args.state_protect = nfs4_sp4_mach_cred_request;
6678                 break;
6679
6680         default:
6681                 /* unsupported! */
6682                 WARN_ON_ONCE(1);
6683                 status = -EINVAL;
6684                 goto out_server_scope;
6685         }
6686
6687         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6688         trace_nfs4_exchange_id(clp, status);
6689         if (status == 0)
6690                 status = nfs4_check_cl_exchange_flags(res.flags);
6691
6692         if (status == 0)
6693                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6694
6695         if (status == 0) {
6696                 clp->cl_clientid = res.clientid;
6697                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6698                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6699                         clp->cl_seqid = res.seqid;
6700
6701                 kfree(clp->cl_serverowner);
6702                 clp->cl_serverowner = res.server_owner;
6703                 res.server_owner = NULL;
6704
6705                 /* use the most recent implementation id */
6706                 kfree(clp->cl_implid);
6707                 clp->cl_implid = res.impl_id;
6708
6709                 if (clp->cl_serverscope != NULL &&
6710                     !nfs41_same_server_scope(clp->cl_serverscope,
6711                                              res.server_scope)) {
6712                         dprintk("%s: server_scope mismatch detected\n",
6713                                 __func__);
6714                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6715                         kfree(clp->cl_serverscope);
6716                         clp->cl_serverscope = NULL;
6717                 }
6718
6719                 if (clp->cl_serverscope == NULL) {
6720                         clp->cl_serverscope = res.server_scope;
6721                         goto out;
6722                 }
6723         } else
6724                 kfree(res.impl_id);
6725
6726 out_server_owner:
6727         kfree(res.server_owner);
6728 out_server_scope:
6729         kfree(res.server_scope);
6730 out:
6731         if (clp->cl_implid != NULL)
6732                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6733                         "domain: %s, name: %s, date: %llu,%u\n",
6734                         clp->cl_implid->domain, clp->cl_implid->name,
6735                         clp->cl_implid->date.seconds,
6736                         clp->cl_implid->date.nseconds);
6737         dprintk("NFS reply exchange_id: %d\n", status);
6738         return status;
6739 }
6740
6741 /*
6742  * nfs4_proc_exchange_id()
6743  *
6744  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6745  *
6746  * Since the clientid has expired, all compounds using sessions
6747  * associated with the stale clientid will be returning
6748  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6749  * be in some phase of session reset.
6750  *
6751  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6752  */
6753 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6754 {
6755         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6756         int status;
6757
6758         /* try SP4_MACH_CRED if krb5i/p */
6759         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6760             authflavor == RPC_AUTH_GSS_KRB5P) {
6761                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6762                 if (!status)
6763                         return 0;
6764         }
6765
6766         /* try SP4_NONE */
6767         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6768 }
6769
6770 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6771                 struct rpc_cred *cred)
6772 {
6773         struct rpc_message msg = {
6774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6775                 .rpc_argp = clp,
6776                 .rpc_cred = cred,
6777         };
6778         int status;
6779
6780         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6781         trace_nfs4_destroy_clientid(clp, status);
6782         if (status)
6783                 dprintk("NFS: Got error %d from the server %s on "
6784                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6785         return status;
6786 }
6787
6788 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6789                 struct rpc_cred *cred)
6790 {
6791         unsigned int loop;
6792         int ret;
6793
6794         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6795                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6796                 switch (ret) {
6797                 case -NFS4ERR_DELAY:
6798                 case -NFS4ERR_CLIENTID_BUSY:
6799                         ssleep(1);
6800                         break;
6801                 default:
6802                         return ret;
6803                 }
6804         }
6805         return 0;
6806 }
6807
6808 int nfs4_destroy_clientid(struct nfs_client *clp)
6809 {
6810         struct rpc_cred *cred;
6811         int ret = 0;
6812
6813         if (clp->cl_mvops->minor_version < 1)
6814                 goto out;
6815         if (clp->cl_exchange_flags == 0)
6816                 goto out;
6817         if (clp->cl_preserve_clid)
6818                 goto out;
6819         cred = nfs4_get_clid_cred(clp);
6820         ret = nfs4_proc_destroy_clientid(clp, cred);
6821         if (cred)
6822                 put_rpccred(cred);
6823         switch (ret) {
6824         case 0:
6825         case -NFS4ERR_STALE_CLIENTID:
6826                 clp->cl_exchange_flags = 0;
6827         }
6828 out:
6829         return ret;
6830 }
6831
6832 struct nfs4_get_lease_time_data {
6833         struct nfs4_get_lease_time_args *args;
6834         struct nfs4_get_lease_time_res *res;
6835         struct nfs_client *clp;
6836 };
6837
6838 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6839                                         void *calldata)
6840 {
6841         struct nfs4_get_lease_time_data *data =
6842                         (struct nfs4_get_lease_time_data *)calldata;
6843
6844         dprintk("--> %s\n", __func__);
6845         /* just setup sequence, do not trigger session recovery
6846            since we're invoked within one */
6847         nfs41_setup_sequence(data->clp->cl_session,
6848                         &data->args->la_seq_args,
6849                         &data->res->lr_seq_res,
6850                         task);
6851         dprintk("<-- %s\n", __func__);
6852 }
6853
6854 /*
6855  * Called from nfs4_state_manager thread for session setup, so don't recover
6856  * from sequence operation or clientid errors.
6857  */
6858 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6859 {
6860         struct nfs4_get_lease_time_data *data =
6861                         (struct nfs4_get_lease_time_data *)calldata;
6862
6863         dprintk("--> %s\n", __func__);
6864         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6865                 return;
6866         switch (task->tk_status) {
6867         case -NFS4ERR_DELAY:
6868         case -NFS4ERR_GRACE:
6869                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6870                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6871                 task->tk_status = 0;
6872                 /* fall through */
6873         case -NFS4ERR_RETRY_UNCACHED_REP:
6874                 rpc_restart_call_prepare(task);
6875                 return;
6876         }
6877         dprintk("<-- %s\n", __func__);
6878 }
6879
6880 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6881         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6882         .rpc_call_done = nfs4_get_lease_time_done,
6883 };
6884
6885 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6886 {
6887         struct rpc_task *task;
6888         struct nfs4_get_lease_time_args args;
6889         struct nfs4_get_lease_time_res res = {
6890                 .lr_fsinfo = fsinfo,
6891         };
6892         struct nfs4_get_lease_time_data data = {
6893                 .args = &args,
6894                 .res = &res,
6895                 .clp = clp,
6896         };
6897         struct rpc_message msg = {
6898                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6899                 .rpc_argp = &args,
6900                 .rpc_resp = &res,
6901         };
6902         struct rpc_task_setup task_setup = {
6903                 .rpc_client = clp->cl_rpcclient,
6904                 .rpc_message = &msg,
6905                 .callback_ops = &nfs4_get_lease_time_ops,
6906                 .callback_data = &data,
6907                 .flags = RPC_TASK_TIMEOUT,
6908         };
6909         int status;
6910
6911         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6912         nfs4_set_sequence_privileged(&args.la_seq_args);
6913         dprintk("--> %s\n", __func__);
6914         task = rpc_run_task(&task_setup);
6915
6916         if (IS_ERR(task))
6917                 status = PTR_ERR(task);
6918         else {
6919                 status = task->tk_status;
6920                 rpc_put_task(task);
6921         }
6922         dprintk("<-- %s return %d\n", __func__, status);
6923
6924         return status;
6925 }
6926
6927 /*
6928  * Initialize the values to be used by the client in CREATE_SESSION
6929  * If nfs4_init_session set the fore channel request and response sizes,
6930  * use them.
6931  *
6932  * Set the back channel max_resp_sz_cached to zero to force the client to
6933  * always set csa_cachethis to FALSE because the current implementation
6934  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6935  */
6936 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6937 {
6938         unsigned int max_rqst_sz, max_resp_sz;
6939
6940         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6941         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6942
6943         /* Fore channel attributes */
6944         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6945         args->fc_attrs.max_resp_sz = max_resp_sz;
6946         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6947         args->fc_attrs.max_reqs = max_session_slots;
6948
6949         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6950                 "max_ops=%u max_reqs=%u\n",
6951                 __func__,
6952                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6953                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6954
6955         /* Back channel attributes */
6956         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6957         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6958         args->bc_attrs.max_resp_sz_cached = 0;
6959         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6960         args->bc_attrs.max_reqs = 1;
6961
6962         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6963                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6964                 __func__,
6965                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6966                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6967                 args->bc_attrs.max_reqs);
6968 }
6969
6970 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6971 {
6972         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6973         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6974
6975         if (rcvd->max_resp_sz > sent->max_resp_sz)
6976                 return -EINVAL;
6977         /*
6978          * Our requested max_ops is the minimum we need; we're not
6979          * prepared to break up compounds into smaller pieces than that.
6980          * So, no point even trying to continue if the server won't
6981          * cooperate:
6982          */
6983         if (rcvd->max_ops < sent->max_ops)
6984                 return -EINVAL;
6985         if (rcvd->max_reqs == 0)
6986                 return -EINVAL;
6987         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6988                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6989         return 0;
6990 }
6991
6992 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6993 {
6994         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6995         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6996
6997         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6998                 return -EINVAL;
6999         if (rcvd->max_resp_sz < sent->max_resp_sz)
7000                 return -EINVAL;
7001         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7002                 return -EINVAL;
7003         /* These would render the backchannel useless: */
7004         if (rcvd->max_ops != sent->max_ops)
7005                 return -EINVAL;
7006         if (rcvd->max_reqs != sent->max_reqs)
7007                 return -EINVAL;
7008         return 0;
7009 }
7010
7011 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7012                                      struct nfs4_session *session)
7013 {
7014         int ret;
7015
7016         ret = nfs4_verify_fore_channel_attrs(args, session);
7017         if (ret)
7018                 return ret;
7019         return nfs4_verify_back_channel_attrs(args, session);
7020 }
7021
7022 static int _nfs4_proc_create_session(struct nfs_client *clp,
7023                 struct rpc_cred *cred)
7024 {
7025         struct nfs4_session *session = clp->cl_session;
7026         struct nfs41_create_session_args args = {
7027                 .client = clp,
7028                 .cb_program = NFS4_CALLBACK,
7029         };
7030         struct nfs41_create_session_res res = {
7031                 .client = clp,
7032         };
7033         struct rpc_message msg = {
7034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7035                 .rpc_argp = &args,
7036                 .rpc_resp = &res,
7037                 .rpc_cred = cred,
7038         };
7039         int status;
7040
7041         nfs4_init_channel_attrs(&args);
7042         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7043
7044         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7045         trace_nfs4_create_session(clp, status);
7046
7047         if (!status) {
7048                 /* Verify the session's negotiated channel_attrs values */
7049                 status = nfs4_verify_channel_attrs(&args, session);
7050                 /* Increment the clientid slot sequence id */
7051                 clp->cl_seqid++;
7052         }
7053
7054         return status;
7055 }
7056
7057 /*
7058  * Issues a CREATE_SESSION operation to the server.
7059  * It is the responsibility of the caller to verify the session is
7060  * expired before calling this routine.
7061  */
7062 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7063 {
7064         int status;
7065         unsigned *ptr;
7066         struct nfs4_session *session = clp->cl_session;
7067
7068         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7069
7070         status = _nfs4_proc_create_session(clp, cred);
7071         if (status)
7072                 goto out;
7073
7074         /* Init or reset the session slot tables */
7075         status = nfs4_setup_session_slot_tables(session);
7076         dprintk("slot table setup returned %d\n", status);
7077         if (status)
7078                 goto out;
7079
7080         ptr = (unsigned *)&session->sess_id.data[0];
7081         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7082                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7083 out:
7084         dprintk("<-- %s\n", __func__);
7085         return status;
7086 }
7087
7088 /*
7089  * Issue the over-the-wire RPC DESTROY_SESSION.
7090  * The caller must serialize access to this routine.
7091  */
7092 int nfs4_proc_destroy_session(struct nfs4_session *session,
7093                 struct rpc_cred *cred)
7094 {
7095         struct rpc_message msg = {
7096                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7097                 .rpc_argp = session,
7098                 .rpc_cred = cred,
7099         };
7100         int status = 0;
7101
7102         dprintk("--> nfs4_proc_destroy_session\n");
7103
7104         /* session is still being setup */
7105         if (session->clp->cl_cons_state != NFS_CS_READY)
7106                 return status;
7107
7108         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7109         trace_nfs4_destroy_session(session->clp, status);
7110
7111         if (status)
7112                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7113                         "Session has been destroyed regardless...\n", status);
7114
7115         dprintk("<-- nfs4_proc_destroy_session\n");
7116         return status;
7117 }
7118
7119 /*
7120  * Renew the cl_session lease.
7121  */
7122 struct nfs4_sequence_data {
7123         struct nfs_client *clp;
7124         struct nfs4_sequence_args args;
7125         struct nfs4_sequence_res res;
7126 };
7127
7128 static void nfs41_sequence_release(void *data)
7129 {
7130         struct nfs4_sequence_data *calldata = data;
7131         struct nfs_client *clp = calldata->clp;
7132
7133         if (atomic_read(&clp->cl_count) > 1)
7134                 nfs4_schedule_state_renewal(clp);
7135         nfs_put_client(clp);
7136         kfree(calldata);
7137 }
7138
7139 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7140 {
7141         switch(task->tk_status) {
7142         case -NFS4ERR_DELAY:
7143                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7144                 return -EAGAIN;
7145         default:
7146                 nfs4_schedule_lease_recovery(clp);
7147         }
7148         return 0;
7149 }
7150
7151 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7152 {
7153         struct nfs4_sequence_data *calldata = data;
7154         struct nfs_client *clp = calldata->clp;
7155
7156         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7157                 return;
7158
7159         trace_nfs4_sequence(clp, task->tk_status);
7160         if (task->tk_status < 0) {
7161                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7162                 if (atomic_read(&clp->cl_count) == 1)
7163                         goto out;
7164
7165                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7166                         rpc_restart_call_prepare(task);
7167                         return;
7168                 }
7169         }
7170         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7171 out:
7172         dprintk("<-- %s\n", __func__);
7173 }
7174
7175 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7176 {
7177         struct nfs4_sequence_data *calldata = data;
7178         struct nfs_client *clp = calldata->clp;
7179         struct nfs4_sequence_args *args;
7180         struct nfs4_sequence_res *res;
7181
7182         args = task->tk_msg.rpc_argp;
7183         res = task->tk_msg.rpc_resp;
7184
7185         nfs41_setup_sequence(clp->cl_session, args, res, task);
7186 }
7187
7188 static const struct rpc_call_ops nfs41_sequence_ops = {
7189         .rpc_call_done = nfs41_sequence_call_done,
7190         .rpc_call_prepare = nfs41_sequence_prepare,
7191         .rpc_release = nfs41_sequence_release,
7192 };
7193
7194 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7195                 struct rpc_cred *cred,
7196                 bool is_privileged)
7197 {
7198         struct nfs4_sequence_data *calldata;
7199         struct rpc_message msg = {
7200                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7201                 .rpc_cred = cred,
7202         };
7203         struct rpc_task_setup task_setup_data = {
7204                 .rpc_client = clp->cl_rpcclient,
7205                 .rpc_message = &msg,
7206                 .callback_ops = &nfs41_sequence_ops,
7207                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7208         };
7209
7210         if (!atomic_inc_not_zero(&clp->cl_count))
7211                 return ERR_PTR(-EIO);
7212         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7213         if (calldata == NULL) {
7214                 nfs_put_client(clp);
7215                 return ERR_PTR(-ENOMEM);
7216         }
7217         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7218         if (is_privileged)
7219                 nfs4_set_sequence_privileged(&calldata->args);
7220         msg.rpc_argp = &calldata->args;
7221         msg.rpc_resp = &calldata->res;
7222         calldata->clp = clp;
7223         task_setup_data.callback_data = calldata;
7224
7225         return rpc_run_task(&task_setup_data);
7226 }
7227
7228 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7229 {
7230         struct rpc_task *task;
7231         int ret = 0;
7232
7233         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7234                 return 0;
7235         task = _nfs41_proc_sequence(clp, cred, false);
7236         if (IS_ERR(task))
7237                 ret = PTR_ERR(task);
7238         else
7239                 rpc_put_task_async(task);
7240         dprintk("<-- %s status=%d\n", __func__, ret);
7241         return ret;
7242 }
7243
7244 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7245 {
7246         struct rpc_task *task;
7247         int ret;
7248
7249         task = _nfs41_proc_sequence(clp, cred, true);
7250         if (IS_ERR(task)) {
7251                 ret = PTR_ERR(task);
7252                 goto out;
7253         }
7254         ret = rpc_wait_for_completion_task(task);
7255         if (!ret) {
7256                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7257
7258                 if (task->tk_status == 0)
7259                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7260                 ret = task->tk_status;
7261         }
7262         rpc_put_task(task);
7263 out:
7264         dprintk("<-- %s status=%d\n", __func__, ret);
7265         return ret;
7266 }
7267
7268 struct nfs4_reclaim_complete_data {
7269         struct nfs_client *clp;
7270         struct nfs41_reclaim_complete_args arg;
7271         struct nfs41_reclaim_complete_res res;
7272 };
7273
7274 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7275 {
7276         struct nfs4_reclaim_complete_data *calldata = data;
7277
7278         nfs41_setup_sequence(calldata->clp->cl_session,
7279                         &calldata->arg.seq_args,
7280                         &calldata->res.seq_res,
7281                         task);
7282 }
7283
7284 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7285 {
7286         switch(task->tk_status) {
7287         case 0:
7288         case -NFS4ERR_COMPLETE_ALREADY:
7289         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7290                 break;
7291         case -NFS4ERR_DELAY:
7292                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7293                 /* fall through */
7294         case -NFS4ERR_RETRY_UNCACHED_REP:
7295                 return -EAGAIN;
7296         default:
7297                 nfs4_schedule_lease_recovery(clp);
7298         }
7299         return 0;
7300 }
7301
7302 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7303 {
7304         struct nfs4_reclaim_complete_data *calldata = data;
7305         struct nfs_client *clp = calldata->clp;
7306         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7307
7308         dprintk("--> %s\n", __func__);
7309         if (!nfs41_sequence_done(task, res))
7310                 return;
7311
7312         trace_nfs4_reclaim_complete(clp, task->tk_status);
7313         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7314                 rpc_restart_call_prepare(task);
7315                 return;
7316         }
7317         dprintk("<-- %s\n", __func__);
7318 }
7319
7320 static void nfs4_free_reclaim_complete_data(void *data)
7321 {
7322         struct nfs4_reclaim_complete_data *calldata = data;
7323
7324         kfree(calldata);
7325 }
7326
7327 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7328         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7329         .rpc_call_done = nfs4_reclaim_complete_done,
7330         .rpc_release = nfs4_free_reclaim_complete_data,
7331 };
7332
7333 /*
7334  * Issue a global reclaim complete.
7335  */
7336 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7337                 struct rpc_cred *cred)
7338 {
7339         struct nfs4_reclaim_complete_data *calldata;
7340         struct rpc_task *task;
7341         struct rpc_message msg = {
7342                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7343                 .rpc_cred = cred,
7344         };
7345         struct rpc_task_setup task_setup_data = {
7346                 .rpc_client = clp->cl_rpcclient,
7347                 .rpc_message = &msg,
7348                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7349                 .flags = RPC_TASK_ASYNC,
7350         };
7351         int status = -ENOMEM;
7352
7353         dprintk("--> %s\n", __func__);
7354         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7355         if (calldata == NULL)
7356                 goto out;
7357         calldata->clp = clp;
7358         calldata->arg.one_fs = 0;
7359
7360         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7361         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7362         msg.rpc_argp = &calldata->arg;
7363         msg.rpc_resp = &calldata->res;
7364         task_setup_data.callback_data = calldata;
7365         task = rpc_run_task(&task_setup_data);
7366         if (IS_ERR(task)) {
7367                 status = PTR_ERR(task);
7368                 goto out;
7369         }
7370         status = nfs4_wait_for_completion_rpc_task(task);
7371         if (status == 0)
7372                 status = task->tk_status;
7373         rpc_put_task(task);
7374         return 0;
7375 out:
7376         dprintk("<-- %s status=%d\n", __func__, status);
7377         return status;
7378 }
7379
7380 static void
7381 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7382 {
7383         struct nfs4_layoutget *lgp = calldata;
7384         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7385         struct nfs4_session *session = nfs4_get_session(server);
7386
7387         dprintk("--> %s\n", __func__);
7388         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7389          * right now covering the LAYOUTGET we are about to send.
7390          * However, that is not so catastrophic, and there seems
7391          * to be no way to prevent it completely.
7392          */
7393         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7394                                 &lgp->res.seq_res, task))
7395                 return;
7396         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7397                                           NFS_I(lgp->args.inode)->layout,
7398                                           lgp->args.ctx->state)) {
7399                 rpc_exit(task, NFS4_OK);
7400         }
7401 }
7402
7403 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7404 {
7405         struct nfs4_layoutget *lgp = calldata;
7406         struct inode *inode = lgp->args.inode;
7407         struct nfs_server *server = NFS_SERVER(inode);
7408         struct pnfs_layout_hdr *lo;
7409         struct nfs4_state *state = NULL;
7410         unsigned long timeo, giveup;
7411
7412         dprintk("--> %s\n", __func__);
7413
7414         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7415                 goto out;
7416
7417         switch (task->tk_status) {
7418         case 0:
7419                 goto out;
7420         case -NFS4ERR_LAYOUTTRYLATER:
7421         case -NFS4ERR_RECALLCONFLICT:
7422                 timeo = rpc_get_timeout(task->tk_client);
7423                 giveup = lgp->args.timestamp + timeo;
7424                 if (time_after(giveup, jiffies))
7425                         task->tk_status = -NFS4ERR_DELAY;
7426                 break;
7427         case -NFS4ERR_EXPIRED:
7428         case -NFS4ERR_BAD_STATEID:
7429                 spin_lock(&inode->i_lock);
7430                 lo = NFS_I(inode)->layout;
7431                 if (!lo || list_empty(&lo->plh_segs)) {
7432                         spin_unlock(&inode->i_lock);
7433                         /* If the open stateid was bad, then recover it. */
7434                         state = lgp->args.ctx->state;
7435                 } else {
7436                         LIST_HEAD(head);
7437
7438                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7439                         spin_unlock(&inode->i_lock);
7440                         /* Mark the bad layout state as invalid, then
7441                          * retry using the open stateid. */
7442                         pnfs_free_lseg_list(&head);
7443                 }
7444         }
7445         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7446                 rpc_restart_call_prepare(task);
7447 out:
7448         dprintk("<-- %s\n", __func__);
7449 }
7450
7451 static size_t max_response_pages(struct nfs_server *server)
7452 {
7453         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7454         return nfs_page_array_len(0, max_resp_sz);
7455 }
7456
7457 static void nfs4_free_pages(struct page **pages, size_t size)
7458 {
7459         int i;
7460
7461         if (!pages)
7462                 return;
7463
7464         for (i = 0; i < size; i++) {
7465                 if (!pages[i])
7466                         break;
7467                 __free_page(pages[i]);
7468         }
7469         kfree(pages);
7470 }
7471
7472 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7473 {
7474         struct page **pages;
7475         int i;
7476
7477         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7478         if (!pages) {
7479                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7480                 return NULL;
7481         }
7482
7483         for (i = 0; i < size; i++) {
7484                 pages[i] = alloc_page(gfp_flags);
7485                 if (!pages[i]) {
7486                         dprintk("%s: failed to allocate page\n", __func__);
7487                         nfs4_free_pages(pages, size);
7488                         return NULL;
7489                 }
7490         }
7491
7492         return pages;
7493 }
7494
7495 static void nfs4_layoutget_release(void *calldata)
7496 {
7497         struct nfs4_layoutget *lgp = calldata;
7498         struct inode *inode = lgp->args.inode;
7499         struct nfs_server *server = NFS_SERVER(inode);
7500         size_t max_pages = max_response_pages(server);
7501
7502         dprintk("--> %s\n", __func__);
7503         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7504         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7505         put_nfs_open_context(lgp->args.ctx);
7506         kfree(calldata);
7507         dprintk("<-- %s\n", __func__);
7508 }
7509
7510 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7511         .rpc_call_prepare = nfs4_layoutget_prepare,
7512         .rpc_call_done = nfs4_layoutget_done,
7513         .rpc_release = nfs4_layoutget_release,
7514 };
7515
7516 struct pnfs_layout_segment *
7517 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7518 {
7519         struct inode *inode = lgp->args.inode;
7520         struct nfs_server *server = NFS_SERVER(inode);
7521         size_t max_pages = max_response_pages(server);
7522         struct rpc_task *task;
7523         struct rpc_message msg = {
7524                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7525                 .rpc_argp = &lgp->args,
7526                 .rpc_resp = &lgp->res,
7527                 .rpc_cred = lgp->cred,
7528         };
7529         struct rpc_task_setup task_setup_data = {
7530                 .rpc_client = server->client,
7531                 .rpc_message = &msg,
7532                 .callback_ops = &nfs4_layoutget_call_ops,
7533                 .callback_data = lgp,
7534                 .flags = RPC_TASK_ASYNC,
7535         };
7536         struct pnfs_layout_segment *lseg = NULL;
7537         int status = 0;
7538
7539         dprintk("--> %s\n", __func__);
7540
7541         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7542         if (!lgp->args.layout.pages) {
7543                 nfs4_layoutget_release(lgp);
7544                 return ERR_PTR(-ENOMEM);
7545         }
7546         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7547         lgp->args.timestamp = jiffies;
7548
7549         lgp->res.layoutp = &lgp->args.layout;
7550         lgp->res.seq_res.sr_slot = NULL;
7551         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7552
7553         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7554         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7555
7556         task = rpc_run_task(&task_setup_data);
7557         if (IS_ERR(task))
7558                 return ERR_CAST(task);
7559         status = nfs4_wait_for_completion_rpc_task(task);
7560         if (status == 0)
7561                 status = task->tk_status;
7562         trace_nfs4_layoutget(lgp->args.ctx,
7563                         &lgp->args.range,
7564                         &lgp->res.range,
7565                         status);
7566         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7567         if (status == 0 && lgp->res.layoutp->len)
7568                 lseg = pnfs_layout_process(lgp);
7569         rpc_put_task(task);
7570         dprintk("<-- %s status=%d\n", __func__, status);
7571         if (status)
7572                 return ERR_PTR(status);
7573         return lseg;
7574 }
7575
7576 static void
7577 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7578 {
7579         struct nfs4_layoutreturn *lrp = calldata;
7580
7581         dprintk("--> %s\n", __func__);
7582         nfs41_setup_sequence(lrp->clp->cl_session,
7583                         &lrp->args.seq_args,
7584                         &lrp->res.seq_res,
7585                         task);
7586 }
7587
7588 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7589 {
7590         struct nfs4_layoutreturn *lrp = calldata;
7591         struct nfs_server *server;
7592
7593         dprintk("--> %s\n", __func__);
7594
7595         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7596                 return;
7597
7598         server = NFS_SERVER(lrp->args.inode);
7599         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7600                 rpc_restart_call_prepare(task);
7601                 return;
7602         }
7603         dprintk("<-- %s\n", __func__);
7604 }
7605
7606 static void nfs4_layoutreturn_release(void *calldata)
7607 {
7608         struct nfs4_layoutreturn *lrp = calldata;
7609         struct pnfs_layout_hdr *lo = lrp->args.layout;
7610
7611         dprintk("--> %s\n", __func__);
7612         spin_lock(&lo->plh_inode->i_lock);
7613         if (lrp->res.lrs_present)
7614                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7615         lo->plh_block_lgets--;
7616         spin_unlock(&lo->plh_inode->i_lock);
7617         pnfs_put_layout_hdr(lrp->args.layout);
7618         kfree(calldata);
7619         dprintk("<-- %s\n", __func__);
7620 }
7621
7622 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7623         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7624         .rpc_call_done = nfs4_layoutreturn_done,
7625         .rpc_release = nfs4_layoutreturn_release,
7626 };
7627
7628 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7629 {
7630         struct rpc_task *task;
7631         struct rpc_message msg = {
7632                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7633                 .rpc_argp = &lrp->args,
7634                 .rpc_resp = &lrp->res,
7635                 .rpc_cred = lrp->cred,
7636         };
7637         struct rpc_task_setup task_setup_data = {
7638                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7639                 .rpc_message = &msg,
7640                 .callback_ops = &nfs4_layoutreturn_call_ops,
7641                 .callback_data = lrp,
7642         };
7643         int status;
7644
7645         dprintk("--> %s\n", __func__);
7646         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7647         task = rpc_run_task(&task_setup_data);
7648         if (IS_ERR(task))
7649                 return PTR_ERR(task);
7650         status = task->tk_status;
7651         trace_nfs4_layoutreturn(lrp->args.inode, status);
7652         dprintk("<-- %s status=%d\n", __func__, status);
7653         rpc_put_task(task);
7654         return status;
7655 }
7656
7657 /*
7658  * Retrieve the list of Data Server devices from the MDS.
7659  */
7660 static int _nfs4_getdevicelist(struct nfs_server *server,
7661                                     const struct nfs_fh *fh,
7662                                     struct pnfs_devicelist *devlist)
7663 {
7664         struct nfs4_getdevicelist_args args = {
7665                 .fh = fh,
7666                 .layoutclass = server->pnfs_curr_ld->id,
7667         };
7668         struct nfs4_getdevicelist_res res = {
7669                 .devlist = devlist,
7670         };
7671         struct rpc_message msg = {
7672                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7673                 .rpc_argp = &args,
7674                 .rpc_resp = &res,
7675         };
7676         int status;
7677
7678         dprintk("--> %s\n", __func__);
7679         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7680                                 &res.seq_res, 0);
7681         dprintk("<-- %s status=%d\n", __func__, status);
7682         return status;
7683 }
7684
7685 int nfs4_proc_getdevicelist(struct nfs_server *server,
7686                             const struct nfs_fh *fh,
7687                             struct pnfs_devicelist *devlist)
7688 {
7689         struct nfs4_exception exception = { };
7690         int err;
7691
7692         do {
7693                 err = nfs4_handle_exception(server,
7694                                 _nfs4_getdevicelist(server, fh, devlist),
7695                                 &exception);
7696         } while (exception.retry);
7697
7698         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7699                 err, devlist->num_devs);
7700
7701         return err;
7702 }
7703 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7704
7705 static int
7706 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7707                 struct pnfs_device *pdev,
7708                 struct rpc_cred *cred)
7709 {
7710         struct nfs4_getdeviceinfo_args args = {
7711                 .pdev = pdev,
7712         };
7713         struct nfs4_getdeviceinfo_res res = {
7714                 .pdev = pdev,
7715         };
7716         struct rpc_message msg = {
7717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7718                 .rpc_argp = &args,
7719                 .rpc_resp = &res,
7720                 .rpc_cred = cred,
7721         };
7722         int status;
7723
7724         dprintk("--> %s\n", __func__);
7725         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7726         dprintk("<-- %s status=%d\n", __func__, status);
7727
7728         return status;
7729 }
7730
7731 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7732                 struct pnfs_device *pdev,
7733                 struct rpc_cred *cred)
7734 {
7735         struct nfs4_exception exception = { };
7736         int err;
7737
7738         do {
7739                 err = nfs4_handle_exception(server,
7740                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7741                                         &exception);
7742         } while (exception.retry);
7743         return err;
7744 }
7745 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7746
7747 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7748 {
7749         struct nfs4_layoutcommit_data *data = calldata;
7750         struct nfs_server *server = NFS_SERVER(data->args.inode);
7751         struct nfs4_session *session = nfs4_get_session(server);
7752
7753         nfs41_setup_sequence(session,
7754                         &data->args.seq_args,
7755                         &data->res.seq_res,
7756                         task);
7757 }
7758
7759 static void
7760 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7761 {
7762         struct nfs4_layoutcommit_data *data = calldata;
7763         struct nfs_server *server = NFS_SERVER(data->args.inode);
7764
7765         if (!nfs41_sequence_done(task, &data->res.seq_res))
7766                 return;
7767
7768         switch (task->tk_status) { /* Just ignore these failures */
7769         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7770         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7771         case -NFS4ERR_BADLAYOUT:     /* no layout */
7772         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7773                 task->tk_status = 0;
7774                 break;
7775         case 0:
7776                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7777                                                    data->res.fattr);
7778                 break;
7779         default:
7780                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7781                         rpc_restart_call_prepare(task);
7782                         return;
7783                 }
7784         }
7785 }
7786
7787 static void nfs4_layoutcommit_release(void *calldata)
7788 {
7789         struct nfs4_layoutcommit_data *data = calldata;
7790
7791         pnfs_cleanup_layoutcommit(data);
7792         put_rpccred(data->cred);
7793         kfree(data);
7794 }
7795
7796 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7797         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7798         .rpc_call_done = nfs4_layoutcommit_done,
7799         .rpc_release = nfs4_layoutcommit_release,
7800 };
7801
7802 int
7803 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7804 {
7805         struct rpc_message msg = {
7806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7807                 .rpc_argp = &data->args,
7808                 .rpc_resp = &data->res,
7809                 .rpc_cred = data->cred,
7810         };
7811         struct rpc_task_setup task_setup_data = {
7812                 .task = &data->task,
7813                 .rpc_client = NFS_CLIENT(data->args.inode),
7814                 .rpc_message = &msg,
7815                 .callback_ops = &nfs4_layoutcommit_ops,
7816                 .callback_data = data,
7817                 .flags = RPC_TASK_ASYNC,
7818         };
7819         struct rpc_task *task;
7820         int status = 0;
7821
7822         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7823                 "lbw: %llu inode %lu\n",
7824                 data->task.tk_pid, sync,
7825                 data->args.lastbytewritten,
7826                 data->args.inode->i_ino);
7827
7828         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7829         task = rpc_run_task(&task_setup_data);
7830         if (IS_ERR(task))
7831                 return PTR_ERR(task);
7832         if (sync == false)
7833                 goto out;
7834         status = nfs4_wait_for_completion_rpc_task(task);
7835         if (status != 0)
7836                 goto out;
7837         status = task->tk_status;
7838         trace_nfs4_layoutcommit(data->args.inode, status);
7839 out:
7840         dprintk("%s: status %d\n", __func__, status);
7841         rpc_put_task(task);
7842         return status;
7843 }
7844
7845 /**
7846  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7847  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7848  */
7849 static int
7850 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7851                     struct nfs_fsinfo *info,
7852                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7853 {
7854         struct nfs41_secinfo_no_name_args args = {
7855                 .style = SECINFO_STYLE_CURRENT_FH,
7856         };
7857         struct nfs4_secinfo_res res = {
7858                 .flavors = flavors,
7859         };
7860         struct rpc_message msg = {
7861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7862                 .rpc_argp = &args,
7863                 .rpc_resp = &res,
7864         };
7865         struct rpc_clnt *clnt = server->client;
7866         struct rpc_cred *cred = NULL;
7867         int status;
7868
7869         if (use_integrity) {
7870                 clnt = server->nfs_client->cl_rpcclient;
7871                 cred = nfs4_get_clid_cred(server->nfs_client);
7872                 msg.rpc_cred = cred;
7873         }
7874
7875         dprintk("--> %s\n", __func__);
7876         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7877                                 &res.seq_res, 0);
7878         dprintk("<-- %s status=%d\n", __func__, status);
7879
7880         if (cred)
7881                 put_rpccred(cred);
7882
7883         return status;
7884 }
7885
7886 static int
7887 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7888                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7889 {
7890         struct nfs4_exception exception = { };
7891         int err;
7892         do {
7893                 /* first try using integrity protection */
7894                 err = -NFS4ERR_WRONGSEC;
7895
7896                 /* try to use integrity protection with machine cred */
7897                 if (_nfs4_is_integrity_protected(server->nfs_client))
7898                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7899                                                           flavors, true);
7900
7901                 /*
7902                  * if unable to use integrity protection, or SECINFO with
7903                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7904                  * disallowed by spec, but exists in deployed servers) use
7905                  * the current filesystem's rpc_client and the user cred.
7906                  */
7907                 if (err == -NFS4ERR_WRONGSEC)
7908                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7909                                                           flavors, false);
7910
7911                 switch (err) {
7912                 case 0:
7913                 case -NFS4ERR_WRONGSEC:
7914                 case -NFS4ERR_NOTSUPP:
7915                         goto out;
7916                 default:
7917                         err = nfs4_handle_exception(server, err, &exception);
7918                 }
7919         } while (exception.retry);
7920 out:
7921         return err;
7922 }
7923
7924 static int
7925 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7926                     struct nfs_fsinfo *info)
7927 {
7928         int err;
7929         struct page *page;
7930         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
7931         struct nfs4_secinfo_flavors *flavors;
7932         struct nfs4_secinfo4 *secinfo;
7933         int i;
7934
7935         page = alloc_page(GFP_KERNEL);
7936         if (!page) {
7937                 err = -ENOMEM;
7938                 goto out;
7939         }
7940
7941         flavors = page_address(page);
7942         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7943
7944         /*
7945          * Fall back on "guess and check" method if
7946          * the server doesn't support SECINFO_NO_NAME
7947          */
7948         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7949                 err = nfs4_find_root_sec(server, fhandle, info);
7950                 goto out_freepage;
7951         }
7952         if (err)
7953                 goto out_freepage;
7954
7955         for (i = 0; i < flavors->num_flavors; i++) {
7956                 secinfo = &flavors->flavors[i];
7957
7958                 switch (secinfo->flavor) {
7959                 case RPC_AUTH_NULL:
7960                 case RPC_AUTH_UNIX:
7961                 case RPC_AUTH_GSS:
7962                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
7963                                         &secinfo->flavor_info);
7964                         break;
7965                 default:
7966                         flavor = RPC_AUTH_MAXFLAVOR;
7967                         break;
7968                 }
7969
7970                 if (!nfs_auth_info_match(&server->auth_info, flavor))
7971                         flavor = RPC_AUTH_MAXFLAVOR;
7972
7973                 if (flavor != RPC_AUTH_MAXFLAVOR) {
7974                         err = nfs4_lookup_root_sec(server, fhandle,
7975                                                    info, flavor);
7976                         if (!err)
7977                                 break;
7978                 }
7979         }
7980
7981         if (flavor == RPC_AUTH_MAXFLAVOR)
7982                 err = -EPERM;
7983
7984 out_freepage:
7985         put_page(page);
7986         if (err == -EACCES)
7987                 return -EPERM;
7988 out:
7989         return err;
7990 }
7991
7992 static int _nfs41_test_stateid(struct nfs_server *server,
7993                 nfs4_stateid *stateid,
7994                 struct rpc_cred *cred)
7995 {
7996         int status;
7997         struct nfs41_test_stateid_args args = {
7998                 .stateid = stateid,
7999         };
8000         struct nfs41_test_stateid_res res;
8001         struct rpc_message msg = {
8002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8003                 .rpc_argp = &args,
8004                 .rpc_resp = &res,
8005                 .rpc_cred = cred,
8006         };
8007         struct rpc_clnt *rpc_client = server->client;
8008
8009         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8010                 &rpc_client, &msg);
8011
8012         dprintk("NFS call  test_stateid %p\n", stateid);
8013         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8014         nfs4_set_sequence_privileged(&args.seq_args);
8015         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8016                         &args.seq_args, &res.seq_res);
8017         if (status != NFS_OK) {
8018                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8019                 return status;
8020         }
8021         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8022         return -res.status;
8023 }
8024
8025 /**
8026  * nfs41_test_stateid - perform a TEST_STATEID operation
8027  *
8028  * @server: server / transport on which to perform the operation
8029  * @stateid: state ID to test
8030  * @cred: credential
8031  *
8032  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8033  * Otherwise a negative NFS4ERR value is returned if the operation
8034  * failed or the state ID is not currently valid.
8035  */
8036 static int nfs41_test_stateid(struct nfs_server *server,
8037                 nfs4_stateid *stateid,
8038                 struct rpc_cred *cred)
8039 {
8040         struct nfs4_exception exception = { };
8041         int err;
8042         do {
8043                 err = _nfs41_test_stateid(server, stateid, cred);
8044                 if (err != -NFS4ERR_DELAY)
8045                         break;
8046                 nfs4_handle_exception(server, err, &exception);
8047         } while (exception.retry);
8048         return err;
8049 }
8050
8051 struct nfs_free_stateid_data {
8052         struct nfs_server *server;
8053         struct nfs41_free_stateid_args args;
8054         struct nfs41_free_stateid_res res;
8055 };
8056
8057 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8058 {
8059         struct nfs_free_stateid_data *data = calldata;
8060         nfs41_setup_sequence(nfs4_get_session(data->server),
8061                         &data->args.seq_args,
8062                         &data->res.seq_res,
8063                         task);
8064 }
8065
8066 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8067 {
8068         struct nfs_free_stateid_data *data = calldata;
8069
8070         nfs41_sequence_done(task, &data->res.seq_res);
8071
8072         switch (task->tk_status) {
8073         case -NFS4ERR_DELAY:
8074                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8075                         rpc_restart_call_prepare(task);
8076         }
8077 }
8078
8079 static void nfs41_free_stateid_release(void *calldata)
8080 {
8081         kfree(calldata);
8082 }
8083
8084 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8085         .rpc_call_prepare = nfs41_free_stateid_prepare,
8086         .rpc_call_done = nfs41_free_stateid_done,
8087         .rpc_release = nfs41_free_stateid_release,
8088 };
8089
8090 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8091                 nfs4_stateid *stateid,
8092                 struct rpc_cred *cred,
8093                 bool privileged)
8094 {
8095         struct rpc_message msg = {
8096                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8097                 .rpc_cred = cred,
8098         };
8099         struct rpc_task_setup task_setup = {
8100                 .rpc_client = server->client,
8101                 .rpc_message = &msg,
8102                 .callback_ops = &nfs41_free_stateid_ops,
8103                 .flags = RPC_TASK_ASYNC,
8104         };
8105         struct nfs_free_stateid_data *data;
8106
8107         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8108                 &task_setup.rpc_client, &msg);
8109
8110         dprintk("NFS call  free_stateid %p\n", stateid);
8111         data = kmalloc(sizeof(*data), GFP_NOFS);
8112         if (!data)
8113                 return ERR_PTR(-ENOMEM);
8114         data->server = server;
8115         nfs4_stateid_copy(&data->args.stateid, stateid);
8116
8117         task_setup.callback_data = data;
8118
8119         msg.rpc_argp = &data->args;
8120         msg.rpc_resp = &data->res;
8121         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8122         if (privileged)
8123                 nfs4_set_sequence_privileged(&data->args.seq_args);
8124
8125         return rpc_run_task(&task_setup);
8126 }
8127
8128 /**
8129  * nfs41_free_stateid - perform a FREE_STATEID operation
8130  *
8131  * @server: server / transport on which to perform the operation
8132  * @stateid: state ID to release
8133  * @cred: credential
8134  *
8135  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8136  * negative NFS4ERR value is returned.
8137  */
8138 static int nfs41_free_stateid(struct nfs_server *server,
8139                 nfs4_stateid *stateid,
8140                 struct rpc_cred *cred)
8141 {
8142         struct rpc_task *task;
8143         int ret;
8144
8145         task = _nfs41_free_stateid(server, stateid, cred, true);
8146         if (IS_ERR(task))
8147                 return PTR_ERR(task);
8148         ret = rpc_wait_for_completion_task(task);
8149         if (!ret)
8150                 ret = task->tk_status;
8151         rpc_put_task(task);
8152         return ret;
8153 }
8154
8155 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8156 {
8157         struct rpc_task *task;
8158         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8159
8160         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8161         nfs4_free_lock_state(server, lsp);
8162         if (IS_ERR(task))
8163                 return PTR_ERR(task);
8164         rpc_put_task(task);
8165         return 0;
8166 }
8167
8168 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8169                 const nfs4_stateid *s2)
8170 {
8171         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8172                 return false;
8173
8174         if (s1->seqid == s2->seqid)
8175                 return true;
8176         if (s1->seqid == 0 || s2->seqid == 0)
8177                 return true;
8178
8179         return false;
8180 }
8181
8182 #endif /* CONFIG_NFS_V4_1 */
8183
8184 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8185                 const nfs4_stateid *s2)
8186 {
8187         return nfs4_stateid_match(s1, s2);
8188 }
8189
8190
8191 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8192         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8193         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8194         .recover_open   = nfs4_open_reclaim,
8195         .recover_lock   = nfs4_lock_reclaim,
8196         .establish_clid = nfs4_init_clientid,
8197         .detect_trunking = nfs40_discover_server_trunking,
8198 };
8199
8200 #if defined(CONFIG_NFS_V4_1)
8201 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8202         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8203         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8204         .recover_open   = nfs4_open_reclaim,
8205         .recover_lock   = nfs4_lock_reclaim,
8206         .establish_clid = nfs41_init_clientid,
8207         .reclaim_complete = nfs41_proc_reclaim_complete,
8208         .detect_trunking = nfs41_discover_server_trunking,
8209 };
8210 #endif /* CONFIG_NFS_V4_1 */
8211
8212 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8213         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8214         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8215         .recover_open   = nfs4_open_expired,
8216         .recover_lock   = nfs4_lock_expired,
8217         .establish_clid = nfs4_init_clientid,
8218 };
8219
8220 #if defined(CONFIG_NFS_V4_1)
8221 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8222         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8223         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8224         .recover_open   = nfs41_open_expired,
8225         .recover_lock   = nfs41_lock_expired,
8226         .establish_clid = nfs41_init_clientid,
8227 };
8228 #endif /* CONFIG_NFS_V4_1 */
8229
8230 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8231         .sched_state_renewal = nfs4_proc_async_renew,
8232         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8233         .renew_lease = nfs4_proc_renew,
8234 };
8235
8236 #if defined(CONFIG_NFS_V4_1)
8237 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8238         .sched_state_renewal = nfs41_proc_async_sequence,
8239         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8240         .renew_lease = nfs4_proc_sequence,
8241 };
8242 #endif
8243
8244 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8245         .get_locations = _nfs40_proc_get_locations,
8246         .fsid_present = _nfs40_proc_fsid_present,
8247 };
8248
8249 #if defined(CONFIG_NFS_V4_1)
8250 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8251         .get_locations = _nfs41_proc_get_locations,
8252         .fsid_present = _nfs41_proc_fsid_present,
8253 };
8254 #endif  /* CONFIG_NFS_V4_1 */
8255
8256 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8257         .minor_version = 0,
8258         .init_caps = NFS_CAP_READDIRPLUS
8259                 | NFS_CAP_ATOMIC_OPEN
8260                 | NFS_CAP_CHANGE_ATTR
8261                 | NFS_CAP_POSIX_LOCK,
8262         .init_client = nfs40_init_client,
8263         .shutdown_client = nfs40_shutdown_client,
8264         .match_stateid = nfs4_match_stateid,
8265         .find_root_sec = nfs4_find_root_sec,
8266         .free_lock_state = nfs4_release_lockowner,
8267         .call_sync_ops = &nfs40_call_sync_ops,
8268         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8269         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8270         .state_renewal_ops = &nfs40_state_renewal_ops,
8271         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8272 };
8273
8274 #if defined(CONFIG_NFS_V4_1)
8275 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8276         .minor_version = 1,
8277         .init_caps = NFS_CAP_READDIRPLUS
8278                 | NFS_CAP_ATOMIC_OPEN
8279                 | NFS_CAP_CHANGE_ATTR
8280                 | NFS_CAP_POSIX_LOCK
8281                 | NFS_CAP_STATEID_NFSV41
8282                 | NFS_CAP_ATOMIC_OPEN_V1,
8283         .init_client = nfs41_init_client,
8284         .shutdown_client = nfs41_shutdown_client,
8285         .match_stateid = nfs41_match_stateid,
8286         .find_root_sec = nfs41_find_root_sec,
8287         .free_lock_state = nfs41_free_lock_state,
8288         .call_sync_ops = &nfs41_call_sync_ops,
8289         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8290         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8291         .state_renewal_ops = &nfs41_state_renewal_ops,
8292         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8293 };
8294 #endif
8295
8296 #if defined(CONFIG_NFS_V4_2)
8297 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8298         .minor_version = 2,
8299         .init_caps = NFS_CAP_READDIRPLUS
8300                 | NFS_CAP_ATOMIC_OPEN
8301                 | NFS_CAP_CHANGE_ATTR
8302                 | NFS_CAP_POSIX_LOCK
8303                 | NFS_CAP_STATEID_NFSV41
8304                 | NFS_CAP_ATOMIC_OPEN_V1,
8305         .init_client = nfs41_init_client,
8306         .shutdown_client = nfs41_shutdown_client,
8307         .match_stateid = nfs41_match_stateid,
8308         .find_root_sec = nfs41_find_root_sec,
8309         .free_lock_state = nfs41_free_lock_state,
8310         .call_sync_ops = &nfs41_call_sync_ops,
8311         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8312         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8313         .state_renewal_ops = &nfs41_state_renewal_ops,
8314 };
8315 #endif
8316
8317 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8318         [0] = &nfs_v4_0_minor_ops,
8319 #if defined(CONFIG_NFS_V4_1)
8320         [1] = &nfs_v4_1_minor_ops,
8321 #endif
8322 #if defined(CONFIG_NFS_V4_2)
8323         [2] = &nfs_v4_2_minor_ops,
8324 #endif
8325 };
8326
8327 static const struct inode_operations nfs4_dir_inode_operations = {
8328         .create         = nfs_create,
8329         .lookup         = nfs_lookup,
8330         .atomic_open    = nfs_atomic_open,
8331         .link           = nfs_link,
8332         .unlink         = nfs_unlink,
8333         .symlink        = nfs_symlink,
8334         .mkdir          = nfs_mkdir,
8335         .rmdir          = nfs_rmdir,
8336         .mknod          = nfs_mknod,
8337         .rename         = nfs_rename,
8338         .permission     = nfs_permission,
8339         .getattr        = nfs_getattr,
8340         .setattr        = nfs_setattr,
8341         .getxattr       = generic_getxattr,
8342         .setxattr       = generic_setxattr,
8343         .listxattr      = generic_listxattr,
8344         .removexattr    = generic_removexattr,
8345 };
8346
8347 static const struct inode_operations nfs4_file_inode_operations = {
8348         .permission     = nfs_permission,
8349         .getattr        = nfs_getattr,
8350         .setattr        = nfs_setattr,
8351         .getxattr       = generic_getxattr,
8352         .setxattr       = generic_setxattr,
8353         .listxattr      = generic_listxattr,
8354         .removexattr    = generic_removexattr,
8355 };
8356
8357 const struct nfs_rpc_ops nfs_v4_clientops = {
8358         .version        = 4,                    /* protocol version */
8359         .dentry_ops     = &nfs4_dentry_operations,
8360         .dir_inode_ops  = &nfs4_dir_inode_operations,
8361         .file_inode_ops = &nfs4_file_inode_operations,
8362         .file_ops       = &nfs4_file_operations,
8363         .getroot        = nfs4_proc_get_root,
8364         .submount       = nfs4_submount,
8365         .try_mount      = nfs4_try_mount,
8366         .getattr        = nfs4_proc_getattr,
8367         .setattr        = nfs4_proc_setattr,
8368         .lookup         = nfs4_proc_lookup,
8369         .access         = nfs4_proc_access,
8370         .readlink       = nfs4_proc_readlink,
8371         .create         = nfs4_proc_create,
8372         .remove         = nfs4_proc_remove,
8373         .unlink_setup   = nfs4_proc_unlink_setup,
8374         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8375         .unlink_done    = nfs4_proc_unlink_done,
8376         .rename         = nfs4_proc_rename,
8377         .rename_setup   = nfs4_proc_rename_setup,
8378         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8379         .rename_done    = nfs4_proc_rename_done,
8380         .link           = nfs4_proc_link,
8381         .symlink        = nfs4_proc_symlink,
8382         .mkdir          = nfs4_proc_mkdir,
8383         .rmdir          = nfs4_proc_remove,
8384         .readdir        = nfs4_proc_readdir,
8385         .mknod          = nfs4_proc_mknod,
8386         .statfs         = nfs4_proc_statfs,
8387         .fsinfo         = nfs4_proc_fsinfo,
8388         .pathconf       = nfs4_proc_pathconf,
8389         .set_capabilities = nfs4_server_capabilities,
8390         .decode_dirent  = nfs4_decode_dirent,
8391         .read_setup     = nfs4_proc_read_setup,
8392         .read_pageio_init = pnfs_pageio_init_read,
8393         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8394         .read_done      = nfs4_read_done,
8395         .write_setup    = nfs4_proc_write_setup,
8396         .write_pageio_init = pnfs_pageio_init_write,
8397         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8398         .write_done     = nfs4_write_done,
8399         .commit_setup   = nfs4_proc_commit_setup,
8400         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8401         .commit_done    = nfs4_commit_done,
8402         .lock           = nfs4_proc_lock,
8403         .clear_acl_cache = nfs4_zap_acl_attr,
8404         .close_context  = nfs4_close_context,
8405         .open_context   = nfs4_atomic_open,
8406         .have_delegation = nfs4_have_delegation,
8407         .return_delegation = nfs4_inode_return_delegation,
8408         .alloc_client   = nfs4_alloc_client,
8409         .init_client    = nfs4_init_client,
8410         .free_client    = nfs4_free_client,
8411         .create_server  = nfs4_create_server,
8412         .clone_server   = nfs_clone_server,
8413 };
8414
8415 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8416         .prefix = XATTR_NAME_NFSV4_ACL,
8417         .list   = nfs4_xattr_list_nfs4_acl,
8418         .get    = nfs4_xattr_get_nfs4_acl,
8419         .set    = nfs4_xattr_set_nfs4_acl,
8420 };
8421
8422 const struct xattr_handler *nfs4_xattr_handlers[] = {
8423         &nfs4_xattr_nfs4_acl_handler,
8424 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8425         &nfs4_xattr_nfs4_label_handler,
8426 #endif
8427         NULL
8428 };
8429
8430 /*
8431  * Local variables:
8432  *  c-basic-offset: 8
8433  * End:
8434  */