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                         break;
2522                 case -NFS4ERR_ADMIN_REVOKED:
2523                 case -NFS4ERR_STALE_STATEID:
2524                 case -NFS4ERR_OLD_STATEID:
2525                 case -NFS4ERR_BAD_STATEID:
2526                 case -NFS4ERR_EXPIRED:
2527                         if (calldata->arg.fmode == 0)
2528                                 break;
2529                 default:
2530                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
2531                                 rpc_restart_call_prepare(task);
2532                                 goto out_release;
2533                         }
2534         }
2535         nfs4_close_clear_stateid_flags(state, calldata->arg.fmode);
2536 out_release:
2537         nfs_release_seqid(calldata->arg.seqid);
2538         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2539         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2540 }
2541
2542 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2543 {
2544         struct nfs4_closedata *calldata = data;
2545         struct nfs4_state *state = calldata->state;
2546         struct inode *inode = calldata->inode;
2547         int call_close = 0;
2548
2549         dprintk("%s: begin!\n", __func__);
2550         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2551                 goto out_wait;
2552
2553         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2554         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2555         spin_lock(&state->owner->so_lock);
2556         /* Calculate the change in open mode */
2557         if (state->n_rdwr == 0) {
2558                 if (state->n_rdonly == 0) {
2559                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2560                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2561                         calldata->arg.fmode &= ~FMODE_READ;
2562                 }
2563                 if (state->n_wronly == 0) {
2564                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2565                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2566                         calldata->arg.fmode &= ~FMODE_WRITE;
2567                 }
2568         }
2569         if (!nfs4_valid_open_stateid(state))
2570                 call_close = 0;
2571         spin_unlock(&state->owner->so_lock);
2572
2573         if (!call_close) {
2574                 /* Note: exit _without_ calling nfs4_close_done */
2575                 goto out_no_action;
2576         }
2577
2578         if (calldata->arg.fmode == 0) {
2579                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2580                 if (calldata->roc &&
2581                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2582                         nfs_release_seqid(calldata->arg.seqid);
2583                         goto out_wait;
2584                     }
2585         }
2586
2587         nfs_fattr_init(calldata->res.fattr);
2588         calldata->timestamp = jiffies;
2589         if (nfs4_setup_sequence(NFS_SERVER(inode),
2590                                 &calldata->arg.seq_args,
2591                                 &calldata->res.seq_res,
2592                                 task) != 0)
2593                 nfs_release_seqid(calldata->arg.seqid);
2594         dprintk("%s: done!\n", __func__);
2595         return;
2596 out_no_action:
2597         task->tk_action = NULL;
2598 out_wait:
2599         nfs4_sequence_done(task, &calldata->res.seq_res);
2600 }
2601
2602 static const struct rpc_call_ops nfs4_close_ops = {
2603         .rpc_call_prepare = nfs4_close_prepare,
2604         .rpc_call_done = nfs4_close_done,
2605         .rpc_release = nfs4_free_closedata,
2606 };
2607
2608 /*
2609  * It is possible for data to be read/written from a mem-mapped file
2610  * after the sys_close call (which hits the vfs layer as a flush).
2611  * This means that we can't safely call nfsv4 close on a file until
2612  * the inode is cleared. This in turn means that we are not good
2613  * NFSv4 citizens - we do not indicate to the server to update the file's
2614  * share state even when we are done with one of the three share
2615  * stateid's in the inode.
2616  *
2617  * NOTE: Caller must be holding the sp->so_owner semaphore!
2618  */
2619 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2620 {
2621         struct nfs_server *server = NFS_SERVER(state->inode);
2622         struct nfs4_closedata *calldata;
2623         struct nfs4_state_owner *sp = state->owner;
2624         struct rpc_task *task;
2625         struct rpc_message msg = {
2626                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2627                 .rpc_cred = state->owner->so_cred,
2628         };
2629         struct rpc_task_setup task_setup_data = {
2630                 .rpc_client = server->client,
2631                 .rpc_message = &msg,
2632                 .callback_ops = &nfs4_close_ops,
2633                 .workqueue = nfsiod_workqueue,
2634                 .flags = RPC_TASK_ASYNC,
2635         };
2636         int status = -ENOMEM;
2637
2638         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2639                 &task_setup_data.rpc_client, &msg);
2640
2641         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2642         if (calldata == NULL)
2643                 goto out;
2644         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2645         calldata->inode = state->inode;
2646         calldata->state = state;
2647         calldata->arg.fh = NFS_FH(state->inode);
2648         calldata->arg.stateid = &state->open_stateid;
2649         /* Serialization for the sequence id */
2650         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2651         if (calldata->arg.seqid == NULL)
2652                 goto out_free_calldata;
2653         calldata->arg.fmode = 0;
2654         calldata->arg.bitmask = server->cache_consistency_bitmask;
2655         calldata->res.fattr = &calldata->fattr;
2656         calldata->res.seqid = calldata->arg.seqid;
2657         calldata->res.server = server;
2658         calldata->roc = pnfs_roc(state->inode);
2659         nfs_sb_active(calldata->inode->i_sb);
2660
2661         msg.rpc_argp = &calldata->arg;
2662         msg.rpc_resp = &calldata->res;
2663         task_setup_data.callback_data = calldata;
2664         task = rpc_run_task(&task_setup_data);
2665         if (IS_ERR(task))
2666                 return PTR_ERR(task);
2667         status = 0;
2668         if (wait)
2669                 status = rpc_wait_for_completion_task(task);
2670         rpc_put_task(task);
2671         return status;
2672 out_free_calldata:
2673         kfree(calldata);
2674 out:
2675         nfs4_put_open_state(state);
2676         nfs4_put_state_owner(sp);
2677         return status;
2678 }
2679
2680 static struct inode *
2681 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2682                 int open_flags, struct iattr *attr, int *opened)
2683 {
2684         struct nfs4_state *state;
2685         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2686
2687         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2688
2689         /* Protect against concurrent sillydeletes */
2690         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2691
2692         nfs4_label_release_security(label);
2693
2694         if (IS_ERR(state))
2695                 return ERR_CAST(state);
2696         return state->inode;
2697 }
2698
2699 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2700 {
2701         if (ctx->state == NULL)
2702                 return;
2703         if (is_sync)
2704                 nfs4_close_sync(ctx->state, ctx->mode);
2705         else
2706                 nfs4_close_state(ctx->state, ctx->mode);
2707 }
2708
2709 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2710 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2711 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_CHANGE_SECURITY_LABEL - 1UL)
2712
2713 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2714 {
2715         struct nfs4_server_caps_arg args = {
2716                 .fhandle = fhandle,
2717         };
2718         struct nfs4_server_caps_res res = {};
2719         struct rpc_message msg = {
2720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2721                 .rpc_argp = &args,
2722                 .rpc_resp = &res,
2723         };
2724         int status;
2725
2726         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2727         if (status == 0) {
2728                 /* Sanity check the server answers */
2729                 switch (server->nfs_client->cl_minorversion) {
2730                 case 0:
2731                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2732                         res.attr_bitmask[2] = 0;
2733                         break;
2734                 case 1:
2735                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2736                         break;
2737                 case 2:
2738                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2739                 }
2740                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2741                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2742                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2743                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2744                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2745                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2746                                 NFS_CAP_SECURITY_LABEL);
2747                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2748                         server->caps |= NFS_CAP_ACLS;
2749                 if (res.has_links != 0)
2750                         server->caps |= NFS_CAP_HARDLINKS;
2751                 if (res.has_symlinks != 0)
2752                         server->caps |= NFS_CAP_SYMLINKS;
2753                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2754                         server->caps |= NFS_CAP_FILEID;
2755                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2756                         server->caps |= NFS_CAP_MODE;
2757                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2758                         server->caps |= NFS_CAP_NLINK;
2759                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2760                         server->caps |= NFS_CAP_OWNER;
2761                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2762                         server->caps |= NFS_CAP_OWNER_GROUP;
2763                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2764                         server->caps |= NFS_CAP_ATIME;
2765                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2766                         server->caps |= NFS_CAP_CTIME;
2767                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2768                         server->caps |= NFS_CAP_MTIME;
2769 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2770                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2771                         server->caps |= NFS_CAP_SECURITY_LABEL;
2772 #endif
2773                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2774                                 sizeof(server->attr_bitmask));
2775                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2776
2777                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2778                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2779                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2780                 server->cache_consistency_bitmask[2] = 0;
2781                 server->acl_bitmask = res.acl_bitmask;
2782                 server->fh_expire_type = res.fh_expire_type;
2783         }
2784
2785         return status;
2786 }
2787
2788 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2789 {
2790         struct nfs4_exception exception = { };
2791         int err;
2792         do {
2793                 err = nfs4_handle_exception(server,
2794                                 _nfs4_server_capabilities(server, fhandle),
2795                                 &exception);
2796         } while (exception.retry);
2797         return err;
2798 }
2799
2800 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2801                 struct nfs_fsinfo *info)
2802 {
2803         u32 bitmask[3];
2804         struct nfs4_lookup_root_arg args = {
2805                 .bitmask = bitmask,
2806         };
2807         struct nfs4_lookup_res res = {
2808                 .server = server,
2809                 .fattr = info->fattr,
2810                 .fh = fhandle,
2811         };
2812         struct rpc_message msg = {
2813                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2814                 .rpc_argp = &args,
2815                 .rpc_resp = &res,
2816         };
2817
2818         bitmask[0] = nfs4_fattr_bitmap[0];
2819         bitmask[1] = nfs4_fattr_bitmap[1];
2820         /*
2821          * Process the label in the upcoming getfattr
2822          */
2823         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2824
2825         nfs_fattr_init(info->fattr);
2826         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2827 }
2828
2829 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2830                 struct nfs_fsinfo *info)
2831 {
2832         struct nfs4_exception exception = { };
2833         int err;
2834         do {
2835                 err = _nfs4_lookup_root(server, fhandle, info);
2836                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2837                 switch (err) {
2838                 case 0:
2839                 case -NFS4ERR_WRONGSEC:
2840                         goto out;
2841                 default:
2842                         err = nfs4_handle_exception(server, err, &exception);
2843                 }
2844         } while (exception.retry);
2845 out:
2846         return err;
2847 }
2848
2849 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2850                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2851 {
2852         struct rpc_auth_create_args auth_args = {
2853                 .pseudoflavor = flavor,
2854         };
2855         struct rpc_auth *auth;
2856         int ret;
2857
2858         auth = rpcauth_create(&auth_args, server->client);
2859         if (IS_ERR(auth)) {
2860                 ret = -EACCES;
2861                 goto out;
2862         }
2863         ret = nfs4_lookup_root(server, fhandle, info);
2864 out:
2865         return ret;
2866 }
2867
2868 /*
2869  * Retry pseudoroot lookup with various security flavors.  We do this when:
2870  *
2871  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2872  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2873  *
2874  * Returns zero on success, or a negative NFS4ERR value, or a
2875  * negative errno value.
2876  */
2877 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2878                               struct nfs_fsinfo *info)
2879 {
2880         /* Per 3530bis 15.33.5 */
2881         static const rpc_authflavor_t flav_array[] = {
2882                 RPC_AUTH_GSS_KRB5P,
2883                 RPC_AUTH_GSS_KRB5I,
2884                 RPC_AUTH_GSS_KRB5,
2885                 RPC_AUTH_UNIX,                  /* courtesy */
2886                 RPC_AUTH_NULL,
2887         };
2888         int status = -EPERM;
2889         size_t i;
2890
2891         if (server->auth_info.flavor_len > 0) {
2892                 /* try each flavor specified by user */
2893                 for (i = 0; i < server->auth_info.flavor_len; i++) {
2894                         status = nfs4_lookup_root_sec(server, fhandle, info,
2895                                                 server->auth_info.flavors[i]);
2896                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2897                                 continue;
2898                         break;
2899                 }
2900         } else {
2901                 /* no flavors specified by user, try default list */
2902                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2903                         status = nfs4_lookup_root_sec(server, fhandle, info,
2904                                                       flav_array[i]);
2905                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2906                                 continue;
2907                         break;
2908                 }
2909         }
2910
2911         /*
2912          * -EACCESS could mean that the user doesn't have correct permissions
2913          * to access the mount.  It could also mean that we tried to mount
2914          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2915          * existing mount programs don't handle -EACCES very well so it should
2916          * be mapped to -EPERM instead.
2917          */
2918         if (status == -EACCES)
2919                 status = -EPERM;
2920         return status;
2921 }
2922
2923 static int nfs4_do_find_root_sec(struct nfs_server *server,
2924                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2925 {
2926         int mv = server->nfs_client->cl_minorversion;
2927         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2928 }
2929
2930 /**
2931  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2932  * @server: initialized nfs_server handle
2933  * @fhandle: we fill in the pseudo-fs root file handle
2934  * @info: we fill in an FSINFO struct
2935  * @auth_probe: probe the auth flavours
2936  *
2937  * Returns zero on success, or a negative errno.
2938  */
2939 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2940                          struct nfs_fsinfo *info,
2941                          bool auth_probe)
2942 {
2943         int status;
2944
2945         switch (auth_probe) {
2946         case false:
2947                 status = nfs4_lookup_root(server, fhandle, info);
2948                 if (status != -NFS4ERR_WRONGSEC)
2949                         break;
2950         default:
2951                 status = nfs4_do_find_root_sec(server, fhandle, info);
2952         }
2953
2954         if (status == 0)
2955                 status = nfs4_server_capabilities(server, fhandle);
2956         if (status == 0)
2957                 status = nfs4_do_fsinfo(server, fhandle, info);
2958
2959         return nfs4_map_errors(status);
2960 }
2961
2962 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2963                               struct nfs_fsinfo *info)
2964 {
2965         int error;
2966         struct nfs_fattr *fattr = info->fattr;
2967         struct nfs4_label *label = NULL;
2968
2969         error = nfs4_server_capabilities(server, mntfh);
2970         if (error < 0) {
2971                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2972                 return error;
2973         }
2974
2975         label = nfs4_label_alloc(server, GFP_KERNEL);
2976         if (IS_ERR(label))
2977                 return PTR_ERR(label);
2978
2979         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2980         if (error < 0) {
2981                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2982                 goto err_free_label;
2983         }
2984
2985         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2986             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2987                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2988
2989 err_free_label:
2990         nfs4_label_free(label);
2991
2992         return error;
2993 }
2994
2995 /*
2996  * Get locations and (maybe) other attributes of a referral.
2997  * Note that we'll actually follow the referral later when
2998  * we detect fsid mismatch in inode revalidation
2999  */
3000 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3001                              const struct qstr *name, struct nfs_fattr *fattr,
3002                              struct nfs_fh *fhandle)
3003 {
3004         int status = -ENOMEM;
3005         struct page *page = NULL;
3006         struct nfs4_fs_locations *locations = NULL;
3007
3008         page = alloc_page(GFP_KERNEL);
3009         if (page == NULL)
3010                 goto out;
3011         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3012         if (locations == NULL)
3013                 goto out;
3014
3015         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3016         if (status != 0)
3017                 goto out;
3018
3019         /*
3020          * If the fsid didn't change, this is a migration event, not a
3021          * referral.  Cause us to drop into the exception handler, which
3022          * will kick off migration recovery.
3023          */
3024         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3025                 dprintk("%s: server did not return a different fsid for"
3026                         " a referral at %s\n", __func__, name->name);
3027                 status = -NFS4ERR_MOVED;
3028                 goto out;
3029         }
3030         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3031         nfs_fixup_referral_attributes(&locations->fattr);
3032
3033         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3034         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3035         memset(fhandle, 0, sizeof(struct nfs_fh));
3036 out:
3037         if (page)
3038                 __free_page(page);
3039         kfree(locations);
3040         return status;
3041 }
3042
3043 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3044                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3045 {
3046         struct nfs4_getattr_arg args = {
3047                 .fh = fhandle,
3048                 .bitmask = server->attr_bitmask,
3049         };
3050         struct nfs4_getattr_res res = {
3051                 .fattr = fattr,
3052                 .label = label,
3053                 .server = server,
3054         };
3055         struct rpc_message msg = {
3056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3057                 .rpc_argp = &args,
3058                 .rpc_resp = &res,
3059         };
3060
3061         args.bitmask = nfs4_bitmask(server, label);
3062
3063         nfs_fattr_init(fattr);
3064         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3065 }
3066
3067 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3068                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3069 {
3070         struct nfs4_exception exception = { };
3071         int err;
3072         do {
3073                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3074                 trace_nfs4_getattr(server, fhandle, fattr, err);
3075                 err = nfs4_handle_exception(server, err,
3076                                 &exception);
3077         } while (exception.retry);
3078         return err;
3079 }
3080
3081 /*
3082  * The file is not closed if it is opened due to the a request to change
3083  * the size of the file. The open call will not be needed once the
3084  * VFS layer lookup-intents are implemented.
3085  *
3086  * Close is called when the inode is destroyed.
3087  * If we haven't opened the file for O_WRONLY, we
3088  * need to in the size_change case to obtain a stateid.
3089  *
3090  * Got race?
3091  * Because OPEN is always done by name in nfsv4, it is
3092  * possible that we opened a different file by the same
3093  * name.  We can recognize this race condition, but we
3094  * can't do anything about it besides returning an error.
3095  *
3096  * This will be fixed with VFS changes (lookup-intent).
3097  */
3098 static int
3099 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3100                   struct iattr *sattr)
3101 {
3102         struct inode *inode = dentry->d_inode;
3103         struct rpc_cred *cred = NULL;
3104         struct nfs4_state *state = NULL;
3105         struct nfs4_label *label = NULL;
3106         int status;
3107
3108         if (pnfs_ld_layoutret_on_setattr(inode))
3109                 pnfs_commit_and_return_layout(inode);
3110
3111         nfs_fattr_init(fattr);
3112
3113         /* Deal with open(O_TRUNC) */
3114         if (sattr->ia_valid & ATTR_OPEN)
3115                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3116
3117         /* Optimization: if the end result is no change, don't RPC */
3118         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3119                 return 0;
3120
3121         /* Search for an existing open(O_WRITE) file */
3122         if (sattr->ia_valid & ATTR_FILE) {
3123                 struct nfs_open_context *ctx;
3124
3125                 ctx = nfs_file_open_context(sattr->ia_file);
3126                 if (ctx) {
3127                         cred = ctx->cred;
3128                         state = ctx->state;
3129                 }
3130         }
3131
3132         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3133         if (IS_ERR(label))
3134                 return PTR_ERR(label);
3135
3136         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3137         if (status == 0) {
3138                 nfs_setattr_update_inode(inode, sattr);
3139                 nfs_setsecurity(inode, fattr, label);
3140         }
3141         nfs4_label_free(label);
3142         return status;
3143 }
3144
3145 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3146                 const struct qstr *name, struct nfs_fh *fhandle,
3147                 struct nfs_fattr *fattr, struct nfs4_label *label)
3148 {
3149         struct nfs_server *server = NFS_SERVER(dir);
3150         int                    status;
3151         struct nfs4_lookup_arg args = {
3152                 .bitmask = server->attr_bitmask,
3153                 .dir_fh = NFS_FH(dir),
3154                 .name = name,
3155         };
3156         struct nfs4_lookup_res res = {
3157                 .server = server,
3158                 .fattr = fattr,
3159                 .label = label,
3160                 .fh = fhandle,
3161         };
3162         struct rpc_message msg = {
3163                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3164                 .rpc_argp = &args,
3165                 .rpc_resp = &res,
3166         };
3167
3168         args.bitmask = nfs4_bitmask(server, label);
3169
3170         nfs_fattr_init(fattr);
3171
3172         dprintk("NFS call  lookup %s\n", name->name);
3173         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3174         dprintk("NFS reply lookup: %d\n", status);
3175         return status;
3176 }
3177
3178 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3179 {
3180         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3181                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3182         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3183         fattr->nlink = 2;
3184 }
3185
3186 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3187                                    struct qstr *name, struct nfs_fh *fhandle,
3188                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3189 {
3190         struct nfs4_exception exception = { };
3191         struct rpc_clnt *client = *clnt;
3192         int err;
3193         do {
3194                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3195                 trace_nfs4_lookup(dir, name, err);
3196                 switch (err) {
3197                 case -NFS4ERR_BADNAME:
3198                         err = -ENOENT;
3199                         goto out;
3200                 case -NFS4ERR_MOVED:
3201                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3202                         goto out;
3203                 case -NFS4ERR_WRONGSEC:
3204                         err = -EPERM;
3205                         if (client != *clnt)
3206                                 goto out;
3207                         client = nfs4_create_sec_client(client, dir, name);
3208                         if (IS_ERR(client))
3209                                 return PTR_ERR(client);
3210
3211                         exception.retry = 1;
3212                         break;
3213                 default:
3214                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3215                 }
3216         } while (exception.retry);
3217
3218 out:
3219         if (err == 0)
3220                 *clnt = client;
3221         else if (client != *clnt)
3222                 rpc_shutdown_client(client);
3223
3224         return err;
3225 }
3226
3227 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3228                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3229                             struct nfs4_label *label)
3230 {
3231         int status;
3232         struct rpc_clnt *client = NFS_CLIENT(dir);
3233
3234         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3235         if (client != NFS_CLIENT(dir)) {
3236                 rpc_shutdown_client(client);
3237                 nfs_fixup_secinfo_attributes(fattr);
3238         }
3239         return status;
3240 }
3241
3242 struct rpc_clnt *
3243 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3244                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3245 {
3246         struct rpc_clnt *client = NFS_CLIENT(dir);
3247         int status;
3248
3249         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3250         if (status < 0)
3251                 return ERR_PTR(status);
3252         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3253 }
3254
3255 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3256 {
3257         struct nfs_server *server = NFS_SERVER(inode);
3258         struct nfs4_accessargs args = {
3259                 .fh = NFS_FH(inode),
3260                 .bitmask = server->cache_consistency_bitmask,
3261         };
3262         struct nfs4_accessres res = {
3263                 .server = server,
3264         };
3265         struct rpc_message msg = {
3266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3267                 .rpc_argp = &args,
3268                 .rpc_resp = &res,
3269                 .rpc_cred = entry->cred,
3270         };
3271         int mode = entry->mask;
3272         int status = 0;
3273
3274         /*
3275          * Determine which access bits we want to ask for...
3276          */
3277         if (mode & MAY_READ)
3278                 args.access |= NFS4_ACCESS_READ;
3279         if (S_ISDIR(inode->i_mode)) {
3280                 if (mode & MAY_WRITE)
3281                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3282                 if (mode & MAY_EXEC)
3283                         args.access |= NFS4_ACCESS_LOOKUP;
3284         } else {
3285                 if (mode & MAY_WRITE)
3286                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3287                 if (mode & MAY_EXEC)
3288                         args.access |= NFS4_ACCESS_EXECUTE;
3289         }
3290
3291         res.fattr = nfs_alloc_fattr();
3292         if (res.fattr == NULL)
3293                 return -ENOMEM;
3294
3295         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3296         if (!status) {
3297                 nfs_access_set_mask(entry, res.access);
3298                 nfs_refresh_inode(inode, res.fattr);
3299         }
3300         nfs_free_fattr(res.fattr);
3301         return status;
3302 }
3303
3304 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3305 {
3306         struct nfs4_exception exception = { };
3307         int err;
3308         do {
3309                 err = _nfs4_proc_access(inode, entry);
3310                 trace_nfs4_access(inode, err);
3311                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3312                                 &exception);
3313         } while (exception.retry);
3314         return err;
3315 }
3316
3317 /*
3318  * TODO: For the time being, we don't try to get any attributes
3319  * along with any of the zero-copy operations READ, READDIR,
3320  * READLINK, WRITE.
3321  *
3322  * In the case of the first three, we want to put the GETATTR
3323  * after the read-type operation -- this is because it is hard
3324  * to predict the length of a GETATTR response in v4, and thus
3325  * align the READ data correctly.  This means that the GETATTR
3326  * may end up partially falling into the page cache, and we should
3327  * shift it into the 'tail' of the xdr_buf before processing.
3328  * To do this efficiently, we need to know the total length
3329  * of data received, which doesn't seem to be available outside
3330  * of the RPC layer.
3331  *
3332  * In the case of WRITE, we also want to put the GETATTR after
3333  * the operation -- in this case because we want to make sure
3334  * we get the post-operation mtime and size.
3335  *
3336  * Both of these changes to the XDR layer would in fact be quite
3337  * minor, but I decided to leave them for a subsequent patch.
3338  */
3339 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3340                 unsigned int pgbase, unsigned int pglen)
3341 {
3342         struct nfs4_readlink args = {
3343                 .fh       = NFS_FH(inode),
3344                 .pgbase   = pgbase,
3345                 .pglen    = pglen,
3346                 .pages    = &page,
3347         };
3348         struct nfs4_readlink_res res;
3349         struct rpc_message msg = {
3350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3351                 .rpc_argp = &args,
3352                 .rpc_resp = &res,
3353         };
3354
3355         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3356 }
3357
3358 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3359                 unsigned int pgbase, unsigned int pglen)
3360 {
3361         struct nfs4_exception exception = { };
3362         int err;
3363         do {
3364                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3365                 trace_nfs4_readlink(inode, err);
3366                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3367                                 &exception);
3368         } while (exception.retry);
3369         return err;
3370 }
3371
3372 /*
3373  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3374  */
3375 static int
3376 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3377                  int flags)
3378 {
3379         struct nfs4_label l, *ilabel = NULL;
3380         struct nfs_open_context *ctx;
3381         struct nfs4_state *state;
3382         int opened = 0;
3383         int status = 0;
3384
3385         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3386         if (IS_ERR(ctx))
3387                 return PTR_ERR(ctx);
3388
3389         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3390
3391         sattr->ia_mode &= ~current_umask();
3392         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3393         if (IS_ERR(state)) {
3394                 status = PTR_ERR(state);
3395                 goto out;
3396         }
3397 out:
3398         nfs4_label_release_security(ilabel);
3399         put_nfs_open_context(ctx);
3400         return status;
3401 }
3402
3403 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3404 {
3405         struct nfs_server *server = NFS_SERVER(dir);
3406         struct nfs_removeargs args = {
3407                 .fh = NFS_FH(dir),
3408                 .name = *name,
3409         };
3410         struct nfs_removeres res = {
3411                 .server = server,
3412         };
3413         struct rpc_message msg = {
3414                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3415                 .rpc_argp = &args,
3416                 .rpc_resp = &res,
3417         };
3418         int status;
3419
3420         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3421         if (status == 0)
3422                 update_changeattr(dir, &res.cinfo);
3423         return status;
3424 }
3425
3426 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3427 {
3428         struct nfs4_exception exception = { };
3429         int err;
3430         do {
3431                 err = _nfs4_proc_remove(dir, name);
3432                 trace_nfs4_remove(dir, name, err);
3433                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3434                                 &exception);
3435         } while (exception.retry);
3436         return err;
3437 }
3438
3439 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3440 {
3441         struct nfs_server *server = NFS_SERVER(dir);
3442         struct nfs_removeargs *args = msg->rpc_argp;
3443         struct nfs_removeres *res = msg->rpc_resp;
3444
3445         res->server = server;
3446         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3447         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3448
3449         nfs_fattr_init(res->dir_attr);
3450 }
3451
3452 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3453 {
3454         nfs4_setup_sequence(NFS_SERVER(data->dir),
3455                         &data->args.seq_args,
3456                         &data->res.seq_res,
3457                         task);
3458 }
3459
3460 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3461 {
3462         struct nfs_unlinkdata *data = task->tk_calldata;
3463         struct nfs_removeres *res = &data->res;
3464
3465         if (!nfs4_sequence_done(task, &res->seq_res))
3466                 return 0;
3467         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3468                 return 0;
3469         update_changeattr(dir, &res->cinfo);
3470         return 1;
3471 }
3472
3473 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3474 {
3475         struct nfs_server *server = NFS_SERVER(dir);
3476         struct nfs_renameargs *arg = msg->rpc_argp;
3477         struct nfs_renameres *res = msg->rpc_resp;
3478
3479         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3480         res->server = server;
3481         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3482 }
3483
3484 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3485 {
3486         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3487                         &data->args.seq_args,
3488                         &data->res.seq_res,
3489                         task);
3490 }
3491
3492 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3493                                  struct inode *new_dir)
3494 {
3495         struct nfs_renamedata *data = task->tk_calldata;
3496         struct nfs_renameres *res = &data->res;
3497
3498         if (!nfs4_sequence_done(task, &res->seq_res))
3499                 return 0;
3500         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3501                 return 0;
3502
3503         update_changeattr(old_dir, &res->old_cinfo);
3504         update_changeattr(new_dir, &res->new_cinfo);
3505         return 1;
3506 }
3507
3508 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3509                 struct inode *new_dir, struct qstr *new_name)
3510 {
3511         struct nfs_server *server = NFS_SERVER(old_dir);
3512         struct nfs_renameargs arg = {
3513                 .old_dir = NFS_FH(old_dir),
3514                 .new_dir = NFS_FH(new_dir),
3515                 .old_name = old_name,
3516                 .new_name = new_name,
3517         };
3518         struct nfs_renameres res = {
3519                 .server = server,
3520         };
3521         struct rpc_message msg = {
3522                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3523                 .rpc_argp = &arg,
3524                 .rpc_resp = &res,
3525         };
3526         int status = -ENOMEM;
3527
3528         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3529         if (!status) {
3530                 update_changeattr(old_dir, &res.old_cinfo);
3531                 update_changeattr(new_dir, &res.new_cinfo);
3532         }
3533         return status;
3534 }
3535
3536 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3537                 struct inode *new_dir, struct qstr *new_name)
3538 {
3539         struct nfs4_exception exception = { };
3540         int err;
3541         do {
3542                 err = _nfs4_proc_rename(old_dir, old_name,
3543                                         new_dir, new_name);
3544                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3545                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3546                                 &exception);
3547         } while (exception.retry);
3548         return err;
3549 }
3550
3551 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3552 {
3553         struct nfs_server *server = NFS_SERVER(inode);
3554         struct nfs4_link_arg arg = {
3555                 .fh     = NFS_FH(inode),
3556                 .dir_fh = NFS_FH(dir),
3557                 .name   = name,
3558                 .bitmask = server->attr_bitmask,
3559         };
3560         struct nfs4_link_res res = {
3561                 .server = server,
3562                 .label = NULL,
3563         };
3564         struct rpc_message msg = {
3565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3566                 .rpc_argp = &arg,
3567                 .rpc_resp = &res,
3568         };
3569         int status = -ENOMEM;
3570
3571         res.fattr = nfs_alloc_fattr();
3572         if (res.fattr == NULL)
3573                 goto out;
3574
3575         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3576         if (IS_ERR(res.label)) {
3577                 status = PTR_ERR(res.label);
3578                 goto out;
3579         }
3580         arg.bitmask = nfs4_bitmask(server, res.label);
3581
3582         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3583         if (!status) {
3584                 update_changeattr(dir, &res.cinfo);
3585                 status = nfs_post_op_update_inode(inode, res.fattr);
3586                 if (!status)
3587                         nfs_setsecurity(inode, res.fattr, res.label);
3588         }
3589
3590
3591         nfs4_label_free(res.label);
3592
3593 out:
3594         nfs_free_fattr(res.fattr);
3595         return status;
3596 }
3597
3598 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3599 {
3600         struct nfs4_exception exception = { };
3601         int err;
3602         do {
3603                 err = nfs4_handle_exception(NFS_SERVER(inode),
3604                                 _nfs4_proc_link(inode, dir, name),
3605                                 &exception);
3606         } while (exception.retry);
3607         return err;
3608 }
3609
3610 struct nfs4_createdata {
3611         struct rpc_message msg;
3612         struct nfs4_create_arg arg;
3613         struct nfs4_create_res res;
3614         struct nfs_fh fh;
3615         struct nfs_fattr fattr;
3616         struct nfs4_label *label;
3617 };
3618
3619 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3620                 struct qstr *name, struct iattr *sattr, u32 ftype)
3621 {
3622         struct nfs4_createdata *data;
3623
3624         data = kzalloc(sizeof(*data), GFP_KERNEL);
3625         if (data != NULL) {
3626                 struct nfs_server *server = NFS_SERVER(dir);
3627
3628                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3629                 if (IS_ERR(data->label))
3630                         goto out_free;
3631
3632                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3633                 data->msg.rpc_argp = &data->arg;
3634                 data->msg.rpc_resp = &data->res;
3635                 data->arg.dir_fh = NFS_FH(dir);
3636                 data->arg.server = server;
3637                 data->arg.name = name;
3638                 data->arg.attrs = sattr;
3639                 data->arg.ftype = ftype;
3640                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3641                 data->res.server = server;
3642                 data->res.fh = &data->fh;
3643                 data->res.fattr = &data->fattr;
3644                 data->res.label = data->label;
3645                 nfs_fattr_init(data->res.fattr);
3646         }
3647         return data;
3648 out_free:
3649         kfree(data);
3650         return NULL;
3651 }
3652
3653 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3654 {
3655         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3656                                     &data->arg.seq_args, &data->res.seq_res, 1);
3657         if (status == 0) {
3658                 update_changeattr(dir, &data->res.dir_cinfo);
3659                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3660         }
3661         return status;
3662 }
3663
3664 static void nfs4_free_createdata(struct nfs4_createdata *data)
3665 {
3666         nfs4_label_free(data->label);
3667         kfree(data);
3668 }
3669
3670 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3671                 struct page *page, unsigned int len, struct iattr *sattr,
3672                 struct nfs4_label *label)
3673 {
3674         struct nfs4_createdata *data;
3675         int status = -ENAMETOOLONG;
3676
3677         if (len > NFS4_MAXPATHLEN)
3678                 goto out;
3679
3680         status = -ENOMEM;
3681         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3682         if (data == NULL)
3683                 goto out;
3684
3685         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3686         data->arg.u.symlink.pages = &page;
3687         data->arg.u.symlink.len = len;
3688         data->arg.label = label;
3689
3690         status = nfs4_do_create(dir, dentry, data);
3691
3692         nfs4_free_createdata(data);
3693 out:
3694         return status;
3695 }
3696
3697 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3698                 struct page *page, unsigned int len, struct iattr *sattr)
3699 {
3700         struct nfs4_exception exception = { };
3701         struct nfs4_label l, *label = NULL;
3702         int err;
3703
3704         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3705
3706         do {
3707                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3708                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3709                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3710                                 &exception);
3711         } while (exception.retry);
3712
3713         nfs4_label_release_security(label);
3714         return err;
3715 }
3716
3717 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3718                 struct iattr *sattr, struct nfs4_label *label)
3719 {
3720         struct nfs4_createdata *data;
3721         int status = -ENOMEM;
3722
3723         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3724         if (data == NULL)
3725                 goto out;
3726
3727         data->arg.label = label;
3728         status = nfs4_do_create(dir, dentry, data);
3729
3730         nfs4_free_createdata(data);
3731 out:
3732         return status;
3733 }
3734
3735 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3736                 struct iattr *sattr)
3737 {
3738         struct nfs4_exception exception = { };
3739         struct nfs4_label l, *label = NULL;
3740         int err;
3741
3742         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3743
3744         sattr->ia_mode &= ~current_umask();
3745         do {
3746                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3747                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3748                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3749                                 &exception);
3750         } while (exception.retry);
3751         nfs4_label_release_security(label);
3752
3753         return err;
3754 }
3755
3756 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3757                 u64 cookie, struct page **pages, unsigned int count, int plus)
3758 {
3759         struct inode            *dir = dentry->d_inode;
3760         struct nfs4_readdir_arg args = {
3761                 .fh = NFS_FH(dir),
3762                 .pages = pages,
3763                 .pgbase = 0,
3764                 .count = count,
3765                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3766                 .plus = plus,
3767         };
3768         struct nfs4_readdir_res res;
3769         struct rpc_message msg = {
3770                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3771                 .rpc_argp = &args,
3772                 .rpc_resp = &res,
3773                 .rpc_cred = cred,
3774         };
3775         int                     status;
3776
3777         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3778                         dentry->d_parent->d_name.name,
3779                         dentry->d_name.name,
3780                         (unsigned long long)cookie);
3781         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3782         res.pgbase = args.pgbase;
3783         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3784         if (status >= 0) {
3785                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3786                 status += args.pgbase;
3787         }
3788
3789         nfs_invalidate_atime(dir);
3790
3791         dprintk("%s: returns %d\n", __func__, status);
3792         return status;
3793 }
3794
3795 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3796                 u64 cookie, struct page **pages, unsigned int count, int plus)
3797 {
3798         struct nfs4_exception exception = { };
3799         int err;
3800         do {
3801                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3802                                 pages, count, plus);
3803                 trace_nfs4_readdir(dentry->d_inode, err);
3804                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3805                                 &exception);
3806         } while (exception.retry);
3807         return err;
3808 }
3809
3810 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3811                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3812 {
3813         struct nfs4_createdata *data;
3814         int mode = sattr->ia_mode;
3815         int status = -ENOMEM;
3816
3817         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3818         if (data == NULL)
3819                 goto out;
3820
3821         if (S_ISFIFO(mode))
3822                 data->arg.ftype = NF4FIFO;
3823         else if (S_ISBLK(mode)) {
3824                 data->arg.ftype = NF4BLK;
3825                 data->arg.u.device.specdata1 = MAJOR(rdev);
3826                 data->arg.u.device.specdata2 = MINOR(rdev);
3827         }
3828         else if (S_ISCHR(mode)) {
3829                 data->arg.ftype = NF4CHR;
3830                 data->arg.u.device.specdata1 = MAJOR(rdev);
3831                 data->arg.u.device.specdata2 = MINOR(rdev);
3832         } else if (!S_ISSOCK(mode)) {
3833                 status = -EINVAL;
3834                 goto out_free;
3835         }
3836
3837         data->arg.label = label;
3838         status = nfs4_do_create(dir, dentry, data);
3839 out_free:
3840         nfs4_free_createdata(data);
3841 out:
3842         return status;
3843 }
3844
3845 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3846                 struct iattr *sattr, dev_t rdev)
3847 {
3848         struct nfs4_exception exception = { };
3849         struct nfs4_label l, *label = NULL;
3850         int err;
3851
3852         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3853
3854         sattr->ia_mode &= ~current_umask();
3855         do {
3856                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3857                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3858                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3859                                 &exception);
3860         } while (exception.retry);
3861
3862         nfs4_label_release_security(label);
3863
3864         return err;
3865 }
3866
3867 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3868                  struct nfs_fsstat *fsstat)
3869 {
3870         struct nfs4_statfs_arg args = {
3871                 .fh = fhandle,
3872                 .bitmask = server->attr_bitmask,
3873         };
3874         struct nfs4_statfs_res res = {
3875                 .fsstat = fsstat,
3876         };
3877         struct rpc_message msg = {
3878                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3879                 .rpc_argp = &args,
3880                 .rpc_resp = &res,
3881         };
3882
3883         nfs_fattr_init(fsstat->fattr);
3884         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3885 }
3886
3887 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3888 {
3889         struct nfs4_exception exception = { };
3890         int err;
3891         do {
3892                 err = nfs4_handle_exception(server,
3893                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3894                                 &exception);
3895         } while (exception.retry);
3896         return err;
3897 }
3898
3899 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3900                 struct nfs_fsinfo *fsinfo)
3901 {
3902         struct nfs4_fsinfo_arg args = {
3903                 .fh = fhandle,
3904                 .bitmask = server->attr_bitmask,
3905         };
3906         struct nfs4_fsinfo_res res = {
3907                 .fsinfo = fsinfo,
3908         };
3909         struct rpc_message msg = {
3910                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3911                 .rpc_argp = &args,
3912                 .rpc_resp = &res,
3913         };
3914
3915         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3916 }
3917
3918 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3919 {
3920         struct nfs4_exception exception = { };
3921         unsigned long now = jiffies;
3922         int err;
3923
3924         do {
3925                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3926                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3927                 if (err == 0) {
3928                         struct nfs_client *clp = server->nfs_client;
3929
3930                         spin_lock(&clp->cl_lock);
3931                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3932                         clp->cl_last_renewal = now;
3933                         spin_unlock(&clp->cl_lock);
3934                         break;
3935                 }
3936                 err = nfs4_handle_exception(server, err, &exception);
3937         } while (exception.retry);
3938         return err;
3939 }
3940
3941 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3942 {
3943         int error;
3944
3945         nfs_fattr_init(fsinfo->fattr);
3946         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3947         if (error == 0) {
3948                 /* block layout checks this! */
3949                 server->pnfs_blksize = fsinfo->blksize;
3950                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3951         }
3952
3953         return error;
3954 }
3955
3956 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3957                 struct nfs_pathconf *pathconf)
3958 {
3959         struct nfs4_pathconf_arg args = {
3960                 .fh = fhandle,
3961                 .bitmask = server->attr_bitmask,
3962         };
3963         struct nfs4_pathconf_res res = {
3964                 .pathconf = pathconf,
3965         };
3966         struct rpc_message msg = {
3967                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3968                 .rpc_argp = &args,
3969                 .rpc_resp = &res,
3970         };
3971
3972         /* None of the pathconf attributes are mandatory to implement */
3973         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3974                 memset(pathconf, 0, sizeof(*pathconf));
3975                 return 0;
3976         }
3977
3978         nfs_fattr_init(pathconf->fattr);
3979         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3980 }
3981
3982 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3983                 struct nfs_pathconf *pathconf)
3984 {
3985         struct nfs4_exception exception = { };
3986         int err;
3987
3988         do {
3989                 err = nfs4_handle_exception(server,
3990                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3991                                 &exception);
3992         } while (exception.retry);
3993         return err;
3994 }
3995
3996 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3997                 const struct nfs_open_context *ctx,
3998                 const struct nfs_lock_context *l_ctx,
3999                 fmode_t fmode)
4000 {
4001         const struct nfs_lockowner *lockowner = NULL;
4002
4003         if (l_ctx != NULL)
4004                 lockowner = &l_ctx->lockowner;
4005         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4006 }
4007 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4008
4009 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4010                 const struct nfs_open_context *ctx,
4011                 const struct nfs_lock_context *l_ctx,
4012                 fmode_t fmode)
4013 {
4014         nfs4_stateid current_stateid;
4015
4016         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
4017                 return false;
4018         return nfs4_stateid_match(stateid, &current_stateid);
4019 }
4020
4021 static bool nfs4_error_stateid_expired(int err)
4022 {
4023         switch (err) {
4024         case -NFS4ERR_DELEG_REVOKED:
4025         case -NFS4ERR_ADMIN_REVOKED:
4026         case -NFS4ERR_BAD_STATEID:
4027         case -NFS4ERR_STALE_STATEID:
4028         case -NFS4ERR_OLD_STATEID:
4029         case -NFS4ERR_OPENMODE:
4030         case -NFS4ERR_EXPIRED:
4031                 return true;
4032         }
4033         return false;
4034 }
4035
4036 void __nfs4_read_done_cb(struct nfs_read_data *data)
4037 {
4038         nfs_invalidate_atime(data->header->inode);
4039 }
4040
4041 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
4042 {
4043         struct nfs_server *server = NFS_SERVER(data->header->inode);
4044
4045         trace_nfs4_read(data, task->tk_status);
4046         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4047                 rpc_restart_call_prepare(task);
4048                 return -EAGAIN;
4049         }
4050
4051         __nfs4_read_done_cb(data);
4052         if (task->tk_status > 0)
4053                 renew_lease(server, data->timestamp);
4054         return 0;
4055 }
4056
4057 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4058                 struct nfs_readargs *args)
4059 {
4060
4061         if (!nfs4_error_stateid_expired(task->tk_status) ||
4062                 nfs4_stateid_is_current(&args->stateid,
4063                                 args->context,
4064                                 args->lock_context,
4065                                 FMODE_READ))
4066                 return false;
4067         rpc_restart_call_prepare(task);
4068         return true;
4069 }
4070
4071 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4072 {
4073
4074         dprintk("--> %s\n", __func__);
4075
4076         if (!nfs4_sequence_done(task, &data->res.seq_res))
4077                 return -EAGAIN;
4078         if (nfs4_read_stateid_changed(task, &data->args))
4079                 return -EAGAIN;
4080         return data->read_done_cb ? data->read_done_cb(task, data) :
4081                                     nfs4_read_done_cb(task, data);
4082 }
4083
4084 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4085 {
4086         data->timestamp   = jiffies;
4087         data->read_done_cb = nfs4_read_done_cb;
4088         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4089         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4090 }
4091
4092 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4093 {
4094         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4095                         &data->args.seq_args,
4096                         &data->res.seq_res,
4097                         task))
4098                 return 0;
4099         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4100                                 data->args.lock_context, FMODE_READ) == -EIO)
4101                 return -EIO;
4102         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4103                 return -EIO;
4104         return 0;
4105 }
4106
4107 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4108 {
4109         struct inode *inode = data->header->inode;
4110
4111         trace_nfs4_write(data, task->tk_status);
4112         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4113                 rpc_restart_call_prepare(task);
4114                 return -EAGAIN;
4115         }
4116         if (task->tk_status >= 0) {
4117                 renew_lease(NFS_SERVER(inode), data->timestamp);
4118                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4119         }
4120         return 0;
4121 }
4122
4123 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4124                 struct nfs_writeargs *args)
4125 {
4126
4127         if (!nfs4_error_stateid_expired(task->tk_status) ||
4128                 nfs4_stateid_is_current(&args->stateid,
4129                                 args->context,
4130                                 args->lock_context,
4131                                 FMODE_WRITE))
4132                 return false;
4133         rpc_restart_call_prepare(task);
4134         return true;
4135 }
4136
4137 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4138 {
4139         if (!nfs4_sequence_done(task, &data->res.seq_res))
4140                 return -EAGAIN;
4141         if (nfs4_write_stateid_changed(task, &data->args))
4142                 return -EAGAIN;
4143         return data->write_done_cb ? data->write_done_cb(task, data) :
4144                 nfs4_write_done_cb(task, data);
4145 }
4146
4147 static
4148 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4149 {
4150         const struct nfs_pgio_header *hdr = data->header;
4151
4152         /* Don't request attributes for pNFS or O_DIRECT writes */
4153         if (data->ds_clp != NULL || hdr->dreq != NULL)
4154                 return false;
4155         /* Otherwise, request attributes if and only if we don't hold
4156          * a delegation
4157          */
4158         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4159 }
4160
4161 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4162 {
4163         struct nfs_server *server = NFS_SERVER(data->header->inode);
4164
4165         if (!nfs4_write_need_cache_consistency_data(data)) {
4166                 data->args.bitmask = NULL;
4167                 data->res.fattr = NULL;
4168         } else
4169                 data->args.bitmask = server->cache_consistency_bitmask;
4170
4171         if (!data->write_done_cb)
4172                 data->write_done_cb = nfs4_write_done_cb;
4173         data->res.server = server;
4174         data->timestamp   = jiffies;
4175
4176         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4177         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4178 }
4179
4180 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4181 {
4182         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4183                         &data->args.seq_args,
4184                         &data->res.seq_res,
4185                         task))
4186                 return 0;
4187         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4188                                 data->args.lock_context, FMODE_WRITE) == -EIO)
4189                 return -EIO;
4190         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4191                 return -EIO;
4192         return 0;
4193 }
4194
4195 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4196 {
4197         nfs4_setup_sequence(NFS_SERVER(data->inode),
4198                         &data->args.seq_args,
4199                         &data->res.seq_res,
4200                         task);
4201 }
4202
4203 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4204 {
4205         struct inode *inode = data->inode;
4206
4207         trace_nfs4_commit(data, task->tk_status);
4208         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4209                 rpc_restart_call_prepare(task);
4210                 return -EAGAIN;
4211         }
4212         return 0;
4213 }
4214
4215 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4216 {
4217         if (!nfs4_sequence_done(task, &data->res.seq_res))
4218                 return -EAGAIN;
4219         return data->commit_done_cb(task, data);
4220 }
4221
4222 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4223 {
4224         struct nfs_server *server = NFS_SERVER(data->inode);
4225
4226         if (data->commit_done_cb == NULL)
4227                 data->commit_done_cb = nfs4_commit_done_cb;
4228         data->res.server = server;
4229         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4230         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4231 }
4232
4233 struct nfs4_renewdata {
4234         struct nfs_client       *client;
4235         unsigned long           timestamp;
4236 };
4237
4238 /*
4239  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4240  * standalone procedure for queueing an asynchronous RENEW.
4241  */
4242 static void nfs4_renew_release(void *calldata)
4243 {
4244         struct nfs4_renewdata *data = calldata;
4245         struct nfs_client *clp = data->client;
4246
4247         if (atomic_read(&clp->cl_count) > 1)
4248                 nfs4_schedule_state_renewal(clp);
4249         nfs_put_client(clp);
4250         kfree(data);
4251 }
4252
4253 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4254 {
4255         struct nfs4_renewdata *data = calldata;
4256         struct nfs_client *clp = data->client;
4257         unsigned long timestamp = data->timestamp;
4258
4259         trace_nfs4_renew_async(clp, task->tk_status);
4260         switch (task->tk_status) {
4261         case 0:
4262                 break;
4263         case -NFS4ERR_LEASE_MOVED:
4264                 nfs4_schedule_lease_moved_recovery(clp);
4265                 break;
4266         default:
4267                 /* Unless we're shutting down, schedule state recovery! */
4268                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4269                         return;
4270                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4271                         nfs4_schedule_lease_recovery(clp);
4272                         return;
4273                 }
4274                 nfs4_schedule_path_down_recovery(clp);
4275         }
4276         do_renew_lease(clp, timestamp);
4277 }
4278
4279 static const struct rpc_call_ops nfs4_renew_ops = {
4280         .rpc_call_done = nfs4_renew_done,
4281         .rpc_release = nfs4_renew_release,
4282 };
4283
4284 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4285 {
4286         struct rpc_message msg = {
4287                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4288                 .rpc_argp       = clp,
4289                 .rpc_cred       = cred,
4290         };
4291         struct nfs4_renewdata *data;
4292
4293         if (renew_flags == 0)
4294                 return 0;
4295         if (!atomic_inc_not_zero(&clp->cl_count))
4296                 return -EIO;
4297         data = kmalloc(sizeof(*data), GFP_NOFS);
4298         if (data == NULL)
4299                 return -ENOMEM;
4300         data->client = clp;
4301         data->timestamp = jiffies;
4302         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4303                         &nfs4_renew_ops, data);
4304 }
4305
4306 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4307 {
4308         struct rpc_message msg = {
4309                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4310                 .rpc_argp       = clp,
4311                 .rpc_cred       = cred,
4312         };
4313         unsigned long now = jiffies;
4314         int status;
4315
4316         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4317         if (status < 0)
4318                 return status;
4319         do_renew_lease(clp, now);
4320         return 0;
4321 }
4322
4323 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4324 {
4325         return (server->caps & NFS_CAP_ACLS)
4326                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4327                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4328 }
4329
4330 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4331  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4332  * the stack.
4333  */
4334 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4335
4336 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4337                 struct page **pages, unsigned int *pgbase)
4338 {
4339         struct page *newpage, **spages;
4340         int rc = 0;
4341         size_t len;
4342         spages = pages;
4343
4344         do {
4345                 len = min_t(size_t, PAGE_SIZE, buflen);
4346                 newpage = alloc_page(GFP_KERNEL);
4347
4348                 if (newpage == NULL)
4349                         goto unwind;
4350                 memcpy(page_address(newpage), buf, len);
4351                 buf += len;
4352                 buflen -= len;
4353                 *pages++ = newpage;
4354                 rc++;
4355         } while (buflen != 0);
4356
4357         return rc;
4358
4359 unwind:
4360         for(; rc > 0; rc--)
4361                 __free_page(spages[rc-1]);
4362         return -ENOMEM;
4363 }
4364
4365 struct nfs4_cached_acl {
4366         int cached;
4367         size_t len;
4368         char data[0];
4369 };
4370
4371 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4372 {
4373         struct nfs_inode *nfsi = NFS_I(inode);
4374
4375         spin_lock(&inode->i_lock);
4376         kfree(nfsi->nfs4_acl);
4377         nfsi->nfs4_acl = acl;
4378         spin_unlock(&inode->i_lock);
4379 }
4380
4381 static void nfs4_zap_acl_attr(struct inode *inode)
4382 {
4383         nfs4_set_cached_acl(inode, NULL);
4384 }
4385
4386 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4387 {
4388         struct nfs_inode *nfsi = NFS_I(inode);
4389         struct nfs4_cached_acl *acl;
4390         int ret = -ENOENT;
4391
4392         spin_lock(&inode->i_lock);
4393         acl = nfsi->nfs4_acl;
4394         if (acl == NULL)
4395                 goto out;
4396         if (buf == NULL) /* user is just asking for length */
4397                 goto out_len;
4398         if (acl->cached == 0)
4399                 goto out;
4400         ret = -ERANGE; /* see getxattr(2) man page */
4401         if (acl->len > buflen)
4402                 goto out;
4403         memcpy(buf, acl->data, acl->len);
4404 out_len:
4405         ret = acl->len;
4406 out:
4407         spin_unlock(&inode->i_lock);
4408         return ret;
4409 }
4410
4411 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4412 {
4413         struct nfs4_cached_acl *acl;
4414         size_t buflen = sizeof(*acl) + acl_len;
4415
4416         if (buflen <= PAGE_SIZE) {
4417                 acl = kmalloc(buflen, GFP_KERNEL);
4418                 if (acl == NULL)
4419                         goto out;
4420                 acl->cached = 1;
4421                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4422         } else {
4423                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4424                 if (acl == NULL)
4425                         goto out;
4426                 acl->cached = 0;
4427         }
4428         acl->len = acl_len;
4429 out:
4430         nfs4_set_cached_acl(inode, acl);
4431 }
4432
4433 /*
4434  * The getxattr API returns the required buffer length when called with a
4435  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4436  * the required buf.  On a NULL buf, we send a page of data to the server
4437  * guessing that the ACL request can be serviced by a page. If so, we cache
4438  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4439  * the cache. If not so, we throw away the page, and cache the required
4440  * length. The next getxattr call will then produce another round trip to
4441  * the server, this time with the input buf of the required size.
4442  */
4443 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4444 {
4445         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4446         struct nfs_getaclargs args = {
4447                 .fh = NFS_FH(inode),
4448                 .acl_pages = pages,
4449                 .acl_len = buflen,
4450         };
4451         struct nfs_getaclres res = {
4452                 .acl_len = buflen,
4453         };
4454         struct rpc_message msg = {
4455                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4456                 .rpc_argp = &args,
4457                 .rpc_resp = &res,
4458         };
4459         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4460         int ret = -ENOMEM, i;
4461
4462         /* As long as we're doing a round trip to the server anyway,
4463          * let's be prepared for a page of acl data. */
4464         if (npages == 0)
4465                 npages = 1;
4466         if (npages > ARRAY_SIZE(pages))
4467                 return -ERANGE;
4468
4469         for (i = 0; i < npages; i++) {
4470                 pages[i] = alloc_page(GFP_KERNEL);
4471                 if (!pages[i])
4472                         goto out_free;
4473         }
4474
4475         /* for decoding across pages */
4476         res.acl_scratch = alloc_page(GFP_KERNEL);
4477         if (!res.acl_scratch)
4478                 goto out_free;
4479
4480         args.acl_len = npages * PAGE_SIZE;
4481         args.acl_pgbase = 0;
4482
4483         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4484                 __func__, buf, buflen, npages, args.acl_len);
4485         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4486                              &msg, &args.seq_args, &res.seq_res, 0);
4487         if (ret)
4488                 goto out_free;
4489
4490         /* Handle the case where the passed-in buffer is too short */
4491         if (res.acl_flags & NFS4_ACL_TRUNC) {
4492                 /* Did the user only issue a request for the acl length? */
4493                 if (buf == NULL)
4494                         goto out_ok;
4495                 ret = -ERANGE;
4496                 goto out_free;
4497         }
4498         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4499         if (buf) {
4500                 if (res.acl_len > buflen) {
4501                         ret = -ERANGE;
4502                         goto out_free;
4503                 }
4504                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4505         }
4506 out_ok:
4507         ret = res.acl_len;
4508 out_free:
4509         for (i = 0; i < npages; i++)
4510                 if (pages[i])
4511                         __free_page(pages[i]);
4512         if (res.acl_scratch)
4513                 __free_page(res.acl_scratch);
4514         return ret;
4515 }
4516
4517 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4518 {
4519         struct nfs4_exception exception = { };
4520         ssize_t ret;
4521         do {
4522                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4523                 trace_nfs4_get_acl(inode, ret);
4524                 if (ret >= 0)
4525                         break;
4526                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4527         } while (exception.retry);
4528         return ret;
4529 }
4530
4531 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4532 {
4533         struct nfs_server *server = NFS_SERVER(inode);
4534         int ret;
4535
4536         if (!nfs4_server_supports_acls(server))
4537                 return -EOPNOTSUPP;
4538         ret = nfs_revalidate_inode(server, inode);
4539         if (ret < 0)
4540                 return ret;
4541         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4542                 nfs_zap_acl_cache(inode);
4543         ret = nfs4_read_cached_acl(inode, buf, buflen);
4544         if (ret != -ENOENT)
4545                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4546                  * but no cached acl data, just the acl length */
4547                 return ret;
4548         return nfs4_get_acl_uncached(inode, buf, buflen);
4549 }
4550
4551 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4552 {
4553         struct nfs_server *server = NFS_SERVER(inode);
4554         struct page *pages[NFS4ACL_MAXPAGES];
4555         struct nfs_setaclargs arg = {
4556                 .fh             = NFS_FH(inode),
4557                 .acl_pages      = pages,
4558                 .acl_len        = buflen,
4559         };
4560         struct nfs_setaclres res;
4561         struct rpc_message msg = {
4562                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4563                 .rpc_argp       = &arg,
4564                 .rpc_resp       = &res,
4565         };
4566         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4567         int ret, i;
4568
4569         if (!nfs4_server_supports_acls(server))
4570                 return -EOPNOTSUPP;
4571         if (npages > ARRAY_SIZE(pages))
4572                 return -ERANGE;
4573         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4574         if (i < 0)
4575                 return i;
4576         nfs4_inode_return_delegation(inode);
4577         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4578
4579         /*
4580          * Free each page after tx, so the only ref left is
4581          * held by the network stack
4582          */
4583         for (; i > 0; i--)
4584                 put_page(pages[i-1]);
4585
4586         /*
4587          * Acl update can result in inode attribute update.
4588          * so mark the attribute cache invalid.
4589          */
4590         spin_lock(&inode->i_lock);
4591         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4592         spin_unlock(&inode->i_lock);
4593         nfs_access_zap_cache(inode);
4594         nfs_zap_acl_cache(inode);
4595         return ret;
4596 }
4597
4598 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4599 {
4600         struct nfs4_exception exception = { };
4601         int err;
4602         do {
4603                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4604                 trace_nfs4_set_acl(inode, err);
4605                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4606                                 &exception);
4607         } while (exception.retry);
4608         return err;
4609 }
4610
4611 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4612 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4613                                         size_t buflen)
4614 {
4615         struct nfs_server *server = NFS_SERVER(inode);
4616         struct nfs_fattr fattr;
4617         struct nfs4_label label = {0, 0, buflen, buf};
4618
4619         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4620         struct nfs4_getattr_arg arg = {
4621                 .fh             = NFS_FH(inode),
4622                 .bitmask        = bitmask,
4623         };
4624         struct nfs4_getattr_res res = {
4625                 .fattr          = &fattr,
4626                 .label          = &label,
4627                 .server         = server,
4628         };
4629         struct rpc_message msg = {
4630                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4631                 .rpc_argp       = &arg,
4632                 .rpc_resp       = &res,
4633         };
4634         int ret;
4635
4636         nfs_fattr_init(&fattr);
4637
4638         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4639         if (ret)
4640                 return ret;
4641         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4642                 return -ENOENT;
4643         if (buflen < label.len)
4644                 return -ERANGE;
4645         return 0;
4646 }
4647
4648 static int nfs4_get_security_label(struct inode *inode, void *buf,
4649                                         size_t buflen)
4650 {
4651         struct nfs4_exception exception = { };
4652         int err;
4653
4654         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4655                 return -EOPNOTSUPP;
4656
4657         do {
4658                 err = _nfs4_get_security_label(inode, buf, buflen);
4659                 trace_nfs4_get_security_label(inode, err);
4660                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4661                                 &exception);
4662         } while (exception.retry);
4663         return err;
4664 }
4665
4666 static int _nfs4_do_set_security_label(struct inode *inode,
4667                 struct nfs4_label *ilabel,
4668                 struct nfs_fattr *fattr,
4669                 struct nfs4_label *olabel)
4670 {
4671
4672         struct iattr sattr = {0};
4673         struct nfs_server *server = NFS_SERVER(inode);
4674         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4675         struct nfs_setattrargs arg = {
4676                 .fh             = NFS_FH(inode),
4677                 .iap            = &sattr,
4678                 .server         = server,
4679                 .bitmask        = bitmask,
4680                 .label          = ilabel,
4681         };
4682         struct nfs_setattrres res = {
4683                 .fattr          = fattr,
4684                 .label          = olabel,
4685                 .server         = server,
4686         };
4687         struct rpc_message msg = {
4688                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4689                 .rpc_argp       = &arg,
4690                 .rpc_resp       = &res,
4691         };
4692         int status;
4693
4694         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4695
4696         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4697         if (status)
4698                 dprintk("%s failed: %d\n", __func__, status);
4699
4700         return status;
4701 }
4702
4703 static int nfs4_do_set_security_label(struct inode *inode,
4704                 struct nfs4_label *ilabel,
4705                 struct nfs_fattr *fattr,
4706                 struct nfs4_label *olabel)
4707 {
4708         struct nfs4_exception exception = { };
4709         int err;
4710
4711         do {
4712                 err = _nfs4_do_set_security_label(inode, ilabel,
4713                                 fattr, olabel);
4714                 trace_nfs4_set_security_label(inode, err);
4715                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4716                                 &exception);
4717         } while (exception.retry);
4718         return err;
4719 }
4720
4721 static int
4722 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4723 {
4724         struct nfs4_label ilabel, *olabel = NULL;
4725         struct nfs_fattr fattr;
4726         struct rpc_cred *cred;
4727         struct inode *inode = dentry->d_inode;
4728         int status;
4729
4730         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4731                 return -EOPNOTSUPP;
4732
4733         nfs_fattr_init(&fattr);
4734
4735         ilabel.pi = 0;
4736         ilabel.lfs = 0;
4737         ilabel.label = (char *)buf;
4738         ilabel.len = buflen;
4739
4740         cred = rpc_lookup_cred();
4741         if (IS_ERR(cred))
4742                 return PTR_ERR(cred);
4743
4744         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4745         if (IS_ERR(olabel)) {
4746                 status = -PTR_ERR(olabel);
4747                 goto out;
4748         }
4749
4750         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4751         if (status == 0)
4752                 nfs_setsecurity(inode, &fattr, olabel);
4753
4754         nfs4_label_free(olabel);
4755 out:
4756         put_rpccred(cred);
4757         return status;
4758 }
4759 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4760
4761
4762 static int
4763 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4764 {
4765         struct nfs_client *clp = server->nfs_client;
4766
4767         if (task->tk_status >= 0)
4768                 return 0;
4769         switch(task->tk_status) {
4770                 case -NFS4ERR_DELEG_REVOKED:
4771                 case -NFS4ERR_ADMIN_REVOKED:
4772                 case -NFS4ERR_BAD_STATEID:
4773                         if (state == NULL)
4774                                 break;
4775                         nfs_remove_bad_delegation(state->inode);
4776                 case -NFS4ERR_OPENMODE:
4777                         if (state == NULL)
4778                                 break;
4779                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4780                                 goto recovery_failed;
4781                         goto wait_on_recovery;
4782                 case -NFS4ERR_EXPIRED:
4783                         if (state != NULL) {
4784                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4785                                         goto recovery_failed;
4786                         }
4787                 case -NFS4ERR_STALE_STATEID:
4788                 case -NFS4ERR_STALE_CLIENTID:
4789                         nfs4_schedule_lease_recovery(clp);
4790                         goto wait_on_recovery;
4791                 case -NFS4ERR_MOVED:
4792                         if (nfs4_schedule_migration_recovery(server) < 0)
4793                                 goto recovery_failed;
4794                         goto wait_on_recovery;
4795                 case -NFS4ERR_LEASE_MOVED:
4796                         nfs4_schedule_lease_moved_recovery(clp);
4797                         goto wait_on_recovery;
4798 #if defined(CONFIG_NFS_V4_1)
4799                 case -NFS4ERR_BADSESSION:
4800                 case -NFS4ERR_BADSLOT:
4801                 case -NFS4ERR_BAD_HIGH_SLOT:
4802                 case -NFS4ERR_DEADSESSION:
4803                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4804                 case -NFS4ERR_SEQ_FALSE_RETRY:
4805                 case -NFS4ERR_SEQ_MISORDERED:
4806                         dprintk("%s ERROR %d, Reset session\n", __func__,
4807                                 task->tk_status);
4808                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4809                         goto wait_on_recovery;
4810 #endif /* CONFIG_NFS_V4_1 */
4811                 case -NFS4ERR_DELAY:
4812                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4813                 case -NFS4ERR_GRACE:
4814                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4815                 case -NFS4ERR_RETRY_UNCACHED_REP:
4816                 case -NFS4ERR_OLD_STATEID:
4817                         goto restart_call;
4818         }
4819         task->tk_status = nfs4_map_errors(task->tk_status);
4820         return 0;
4821 recovery_failed:
4822         task->tk_status = -EIO;
4823         return 0;
4824 wait_on_recovery:
4825         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4826         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4827                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4828         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4829                 goto recovery_failed;
4830 restart_call:
4831         task->tk_status = 0;
4832         return -EAGAIN;
4833 }
4834
4835 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4836                                     nfs4_verifier *bootverf)
4837 {
4838         __be32 verf[2];
4839
4840         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4841                 /* An impossible timestamp guarantees this value
4842                  * will never match a generated boot time. */
4843                 verf[0] = 0;
4844                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4845         } else {
4846                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4847                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4848                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4849         }
4850         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4851 }
4852
4853 static unsigned int
4854 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4855                                    char *buf, size_t len)
4856 {
4857         unsigned int result;
4858
4859         rcu_read_lock();
4860         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4861                                 clp->cl_ipaddr,
4862                                 rpc_peeraddr2str(clp->cl_rpcclient,
4863                                                         RPC_DISPLAY_ADDR),
4864                                 rpc_peeraddr2str(clp->cl_rpcclient,
4865                                                         RPC_DISPLAY_PROTO));
4866         rcu_read_unlock();
4867         return result;
4868 }
4869
4870 static unsigned int
4871 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4872                                 char *buf, size_t len)
4873 {
4874         const char *nodename = clp->cl_rpcclient->cl_nodename;
4875
4876         if (nfs4_client_id_uniquifier[0] != '\0')
4877                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4878                                 clp->rpc_ops->version,
4879                                 clp->cl_minorversion,
4880                                 nfs4_client_id_uniquifier,
4881                                 nodename);
4882         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4883                                 clp->rpc_ops->version, clp->cl_minorversion,
4884                                 nodename);
4885 }
4886
4887 /**
4888  * nfs4_proc_setclientid - Negotiate client ID
4889  * @clp: state data structure
4890  * @program: RPC program for NFSv4 callback service
4891  * @port: IP port number for NFS4 callback service
4892  * @cred: RPC credential to use for this call
4893  * @res: where to place the result
4894  *
4895  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4896  */
4897 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4898                 unsigned short port, struct rpc_cred *cred,
4899                 struct nfs4_setclientid_res *res)
4900 {
4901         nfs4_verifier sc_verifier;
4902         struct nfs4_setclientid setclientid = {
4903                 .sc_verifier = &sc_verifier,
4904                 .sc_prog = program,
4905                 .sc_cb_ident = clp->cl_cb_ident,
4906         };
4907         struct rpc_message msg = {
4908                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4909                 .rpc_argp = &setclientid,
4910                 .rpc_resp = res,
4911                 .rpc_cred = cred,
4912         };
4913         int status;
4914
4915         /* nfs_client_id4 */
4916         nfs4_init_boot_verifier(clp, &sc_verifier);
4917         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4918                 setclientid.sc_name_len =
4919                                 nfs4_init_uniform_client_string(clp,
4920                                                 setclientid.sc_name,
4921                                                 sizeof(setclientid.sc_name));
4922         else
4923                 setclientid.sc_name_len =
4924                                 nfs4_init_nonuniform_client_string(clp,
4925                                                 setclientid.sc_name,
4926                                                 sizeof(setclientid.sc_name));
4927         /* cb_client4 */
4928         rcu_read_lock();
4929         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4930                                 sizeof(setclientid.sc_netid), "%s",
4931                                 rpc_peeraddr2str(clp->cl_rpcclient,
4932                                                         RPC_DISPLAY_NETID));
4933         rcu_read_unlock();
4934         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4935                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4936                                 clp->cl_ipaddr, port >> 8, port & 255);
4937
4938         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4939                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4940                 setclientid.sc_name_len, setclientid.sc_name);
4941         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4942         trace_nfs4_setclientid(clp, status);
4943         dprintk("NFS reply setclientid: %d\n", status);
4944         return status;
4945 }
4946
4947 /**
4948  * nfs4_proc_setclientid_confirm - Confirm client ID
4949  * @clp: state data structure
4950  * @res: result of a previous SETCLIENTID
4951  * @cred: RPC credential to use for this call
4952  *
4953  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4954  */
4955 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4956                 struct nfs4_setclientid_res *arg,
4957                 struct rpc_cred *cred)
4958 {
4959         struct rpc_message msg = {
4960                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4961                 .rpc_argp = arg,
4962                 .rpc_cred = cred,
4963         };
4964         int status;
4965
4966         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4967                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4968                 clp->cl_clientid);
4969         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4970         trace_nfs4_setclientid_confirm(clp, status);
4971         dprintk("NFS reply setclientid_confirm: %d\n", status);
4972         return status;
4973 }
4974
4975 struct nfs4_delegreturndata {
4976         struct nfs4_delegreturnargs args;
4977         struct nfs4_delegreturnres res;
4978         struct nfs_fh fh;
4979         nfs4_stateid stateid;
4980         unsigned long timestamp;
4981         struct nfs_fattr fattr;
4982         int rpc_status;
4983 };
4984
4985 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4986 {
4987         struct nfs4_delegreturndata *data = calldata;
4988
4989         if (!nfs4_sequence_done(task, &data->res.seq_res))
4990                 return;
4991
4992         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4993         switch (task->tk_status) {
4994         case 0:
4995                 renew_lease(data->res.server, data->timestamp);
4996                 break;
4997         case -NFS4ERR_ADMIN_REVOKED:
4998         case -NFS4ERR_DELEG_REVOKED:
4999         case -NFS4ERR_BAD_STATEID:
5000         case -NFS4ERR_OLD_STATEID:
5001         case -NFS4ERR_STALE_STATEID:
5002         case -NFS4ERR_EXPIRED:
5003                 task->tk_status = 0;
5004                 break;
5005         default:
5006                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
5007                                 -EAGAIN) {
5008                         rpc_restart_call_prepare(task);
5009                         return;
5010                 }
5011         }
5012         data->rpc_status = task->tk_status;
5013 }
5014
5015 static void nfs4_delegreturn_release(void *calldata)
5016 {
5017         kfree(calldata);
5018 }
5019
5020 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5021 {
5022         struct nfs4_delegreturndata *d_data;
5023
5024         d_data = (struct nfs4_delegreturndata *)data;
5025
5026         nfs4_setup_sequence(d_data->res.server,
5027                         &d_data->args.seq_args,
5028                         &d_data->res.seq_res,
5029                         task);
5030 }
5031
5032 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5033         .rpc_call_prepare = nfs4_delegreturn_prepare,
5034         .rpc_call_done = nfs4_delegreturn_done,
5035         .rpc_release = nfs4_delegreturn_release,
5036 };
5037
5038 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5039 {
5040         struct nfs4_delegreturndata *data;
5041         struct nfs_server *server = NFS_SERVER(inode);
5042         struct rpc_task *task;
5043         struct rpc_message msg = {
5044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5045                 .rpc_cred = cred,
5046         };
5047         struct rpc_task_setup task_setup_data = {
5048                 .rpc_client = server->client,
5049                 .rpc_message = &msg,
5050                 .callback_ops = &nfs4_delegreturn_ops,
5051                 .flags = RPC_TASK_ASYNC,
5052         };
5053         int status = 0;
5054
5055         data = kzalloc(sizeof(*data), GFP_NOFS);
5056         if (data == NULL)
5057                 return -ENOMEM;
5058         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5059         data->args.fhandle = &data->fh;
5060         data->args.stateid = &data->stateid;
5061         data->args.bitmask = server->cache_consistency_bitmask;
5062         nfs_copy_fh(&data->fh, NFS_FH(inode));
5063         nfs4_stateid_copy(&data->stateid, stateid);
5064         data->res.fattr = &data->fattr;
5065         data->res.server = server;
5066         nfs_fattr_init(data->res.fattr);
5067         data->timestamp = jiffies;
5068         data->rpc_status = 0;
5069
5070         task_setup_data.callback_data = data;
5071         msg.rpc_argp = &data->args;
5072         msg.rpc_resp = &data->res;
5073         task = rpc_run_task(&task_setup_data);
5074         if (IS_ERR(task))
5075                 return PTR_ERR(task);
5076         if (!issync)
5077                 goto out;
5078         status = nfs4_wait_for_completion_rpc_task(task);
5079         if (status != 0)
5080                 goto out;
5081         status = data->rpc_status;
5082         if (status == 0)
5083                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5084         else
5085                 nfs_refresh_inode(inode, &data->fattr);
5086 out:
5087         rpc_put_task(task);
5088         return status;
5089 }
5090
5091 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5092 {
5093         struct nfs_server *server = NFS_SERVER(inode);
5094         struct nfs4_exception exception = { };
5095         int err;
5096         do {
5097                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5098                 trace_nfs4_delegreturn(inode, err);
5099                 switch (err) {
5100                         case -NFS4ERR_STALE_STATEID:
5101                         case -NFS4ERR_EXPIRED:
5102                         case 0:
5103                                 return 0;
5104                 }
5105                 err = nfs4_handle_exception(server, err, &exception);
5106         } while (exception.retry);
5107         return err;
5108 }
5109
5110 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5111 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5112
5113 /*
5114  * sleep, with exponential backoff, and retry the LOCK operation.
5115  */
5116 static unsigned long
5117 nfs4_set_lock_task_retry(unsigned long timeout)
5118 {
5119         freezable_schedule_timeout_killable_unsafe(timeout);
5120         timeout <<= 1;
5121         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5122                 return NFS4_LOCK_MAXTIMEOUT;
5123         return timeout;
5124 }
5125
5126 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5127 {
5128         struct inode *inode = state->inode;
5129         struct nfs_server *server = NFS_SERVER(inode);
5130         struct nfs_client *clp = server->nfs_client;
5131         struct nfs_lockt_args arg = {
5132                 .fh = NFS_FH(inode),
5133                 .fl = request,
5134         };
5135         struct nfs_lockt_res res = {
5136                 .denied = request,
5137         };
5138         struct rpc_message msg = {
5139                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5140                 .rpc_argp       = &arg,
5141                 .rpc_resp       = &res,
5142                 .rpc_cred       = state->owner->so_cred,
5143         };
5144         struct nfs4_lock_state *lsp;
5145         int status;
5146
5147         arg.lock_owner.clientid = clp->cl_clientid;
5148         status = nfs4_set_lock_state(state, request);
5149         if (status != 0)
5150                 goto out;
5151         lsp = request->fl_u.nfs4_fl.owner;
5152         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5153         arg.lock_owner.s_dev = server->s_dev;
5154         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5155         switch (status) {
5156                 case 0:
5157                         request->fl_type = F_UNLCK;
5158                         break;
5159                 case -NFS4ERR_DENIED:
5160                         status = 0;
5161         }
5162         request->fl_ops->fl_release_private(request);
5163         request->fl_ops = NULL;
5164 out:
5165         return status;
5166 }
5167
5168 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5169 {
5170         struct nfs4_exception exception = { };
5171         int err;
5172
5173         do {
5174                 err = _nfs4_proc_getlk(state, cmd, request);
5175                 trace_nfs4_get_lock(request, state, cmd, err);
5176                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5177                                 &exception);
5178         } while (exception.retry);
5179         return err;
5180 }
5181
5182 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5183 {
5184         int res = 0;
5185         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5186                 case FL_POSIX:
5187                         res = posix_lock_file_wait(file, fl);
5188                         break;
5189                 case FL_FLOCK:
5190                         res = flock_lock_file_wait(file, fl);
5191                         break;
5192                 default:
5193                         BUG();
5194         }
5195         return res;
5196 }
5197
5198 struct nfs4_unlockdata {
5199         struct nfs_locku_args arg;
5200         struct nfs_locku_res res;
5201         struct nfs4_lock_state *lsp;
5202         struct nfs_open_context *ctx;
5203         struct file_lock fl;
5204         const struct nfs_server *server;
5205         unsigned long timestamp;
5206 };
5207
5208 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5209                 struct nfs_open_context *ctx,
5210                 struct nfs4_lock_state *lsp,
5211                 struct nfs_seqid *seqid)
5212 {
5213         struct nfs4_unlockdata *p;
5214         struct inode *inode = lsp->ls_state->inode;
5215
5216         p = kzalloc(sizeof(*p), GFP_NOFS);
5217         if (p == NULL)
5218                 return NULL;
5219         p->arg.fh = NFS_FH(inode);
5220         p->arg.fl = &p->fl;
5221         p->arg.seqid = seqid;
5222         p->res.seqid = seqid;
5223         p->arg.stateid = &lsp->ls_stateid;
5224         p->lsp = lsp;
5225         atomic_inc(&lsp->ls_count);
5226         /* Ensure we don't close file until we're done freeing locks! */
5227         p->ctx = get_nfs_open_context(ctx);
5228         memcpy(&p->fl, fl, sizeof(p->fl));
5229         p->server = NFS_SERVER(inode);
5230         return p;
5231 }
5232
5233 static void nfs4_locku_release_calldata(void *data)
5234 {
5235         struct nfs4_unlockdata *calldata = data;
5236         nfs_free_seqid(calldata->arg.seqid);
5237         nfs4_put_lock_state(calldata->lsp);
5238         put_nfs_open_context(calldata->ctx);
5239         kfree(calldata);
5240 }
5241
5242 static void nfs4_locku_done(struct rpc_task *task, void *data)
5243 {
5244         struct nfs4_unlockdata *calldata = data;
5245
5246         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5247                 return;
5248         switch (task->tk_status) {
5249                 case 0:
5250                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5251                                         &calldata->res.stateid);
5252                         renew_lease(calldata->server, calldata->timestamp);
5253                         break;
5254                 case -NFS4ERR_BAD_STATEID:
5255                 case -NFS4ERR_OLD_STATEID:
5256                 case -NFS4ERR_STALE_STATEID:
5257                 case -NFS4ERR_EXPIRED:
5258                         break;
5259                 default:
5260                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5261                                 rpc_restart_call_prepare(task);
5262         }
5263         nfs_release_seqid(calldata->arg.seqid);
5264 }
5265
5266 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5267 {
5268         struct nfs4_unlockdata *calldata = data;
5269
5270         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5271                 goto out_wait;
5272         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5273                 /* Note: exit _without_ running nfs4_locku_done */
5274                 goto out_no_action;
5275         }
5276         calldata->timestamp = jiffies;
5277         if (nfs4_setup_sequence(calldata->server,
5278                                 &calldata->arg.seq_args,
5279                                 &calldata->res.seq_res,
5280                                 task) != 0)
5281                 nfs_release_seqid(calldata->arg.seqid);
5282         return;
5283 out_no_action:
5284         task->tk_action = NULL;
5285 out_wait:
5286         nfs4_sequence_done(task, &calldata->res.seq_res);
5287 }
5288
5289 static const struct rpc_call_ops nfs4_locku_ops = {
5290         .rpc_call_prepare = nfs4_locku_prepare,
5291         .rpc_call_done = nfs4_locku_done,
5292         .rpc_release = nfs4_locku_release_calldata,
5293 };
5294
5295 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5296                 struct nfs_open_context *ctx,
5297                 struct nfs4_lock_state *lsp,
5298                 struct nfs_seqid *seqid)
5299 {
5300         struct nfs4_unlockdata *data;
5301         struct rpc_message msg = {
5302                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5303                 .rpc_cred = ctx->cred,
5304         };
5305         struct rpc_task_setup task_setup_data = {
5306                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5307                 .rpc_message = &msg,
5308                 .callback_ops = &nfs4_locku_ops,
5309                 .workqueue = nfsiod_workqueue,
5310                 .flags = RPC_TASK_ASYNC,
5311         };
5312
5313         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5314                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5315
5316         /* Ensure this is an unlock - when canceling a lock, the
5317          * canceled lock is passed in, and it won't be an unlock.
5318          */
5319         fl->fl_type = F_UNLCK;
5320
5321         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5322         if (data == NULL) {
5323                 nfs_free_seqid(seqid);
5324                 return ERR_PTR(-ENOMEM);
5325         }
5326
5327         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5328         msg.rpc_argp = &data->arg;
5329         msg.rpc_resp = &data->res;
5330         task_setup_data.callback_data = data;
5331         return rpc_run_task(&task_setup_data);
5332 }
5333
5334 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5335 {
5336         struct inode *inode = state->inode;
5337         struct nfs4_state_owner *sp = state->owner;
5338         struct nfs_inode *nfsi = NFS_I(inode);
5339         struct nfs_seqid *seqid;
5340         struct nfs4_lock_state *lsp;
5341         struct rpc_task *task;
5342         int status = 0;
5343         unsigned char fl_flags = request->fl_flags;
5344
5345         status = nfs4_set_lock_state(state, request);
5346         /* Unlock _before_ we do the RPC call */
5347         request->fl_flags |= FL_EXISTS;
5348         /* Exclude nfs_delegation_claim_locks() */
5349         mutex_lock(&sp->so_delegreturn_mutex);
5350         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5351         down_read(&nfsi->rwsem);
5352         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5353                 up_read(&nfsi->rwsem);
5354                 mutex_unlock(&sp->so_delegreturn_mutex);
5355                 goto out;
5356         }
5357         up_read(&nfsi->rwsem);
5358         mutex_unlock(&sp->so_delegreturn_mutex);
5359         if (status != 0)
5360                 goto out;
5361         /* Is this a delegated lock? */
5362         lsp = request->fl_u.nfs4_fl.owner;
5363         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5364                 goto out;
5365         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5366         status = -ENOMEM;
5367         if (seqid == NULL)
5368                 goto out;
5369         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5370         status = PTR_ERR(task);
5371         if (IS_ERR(task))
5372                 goto out;
5373         status = nfs4_wait_for_completion_rpc_task(task);
5374         rpc_put_task(task);
5375 out:
5376         request->fl_flags = fl_flags;
5377         trace_nfs4_unlock(request, state, F_SETLK, status);
5378         return status;
5379 }
5380
5381 struct nfs4_lockdata {
5382         struct nfs_lock_args arg;
5383         struct nfs_lock_res res;
5384         struct nfs4_lock_state *lsp;
5385         struct nfs_open_context *ctx;
5386         struct file_lock fl;
5387         unsigned long timestamp;
5388         int rpc_status;
5389         int cancelled;
5390         struct nfs_server *server;
5391 };
5392
5393 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5394                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5395                 gfp_t gfp_mask)
5396 {
5397         struct nfs4_lockdata *p;
5398         struct inode *inode = lsp->ls_state->inode;
5399         struct nfs_server *server = NFS_SERVER(inode);
5400
5401         p = kzalloc(sizeof(*p), gfp_mask);
5402         if (p == NULL)
5403                 return NULL;
5404
5405         p->arg.fh = NFS_FH(inode);
5406         p->arg.fl = &p->fl;
5407         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5408         if (p->arg.open_seqid == NULL)
5409                 goto out_free;
5410         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5411         if (p->arg.lock_seqid == NULL)
5412                 goto out_free_seqid;
5413         p->arg.lock_stateid = &lsp->ls_stateid;
5414         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5415         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5416         p->arg.lock_owner.s_dev = server->s_dev;
5417         p->res.lock_seqid = p->arg.lock_seqid;
5418         p->lsp = lsp;
5419         p->server = server;
5420         atomic_inc(&lsp->ls_count);
5421         p->ctx = get_nfs_open_context(ctx);
5422         memcpy(&p->fl, fl, sizeof(p->fl));
5423         return p;
5424 out_free_seqid:
5425         nfs_free_seqid(p->arg.open_seqid);
5426 out_free:
5427         kfree(p);
5428         return NULL;
5429 }
5430
5431 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5432 {
5433         struct nfs4_lockdata *data = calldata;
5434         struct nfs4_state *state = data->lsp->ls_state;
5435
5436         dprintk("%s: begin!\n", __func__);
5437         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5438                 goto out_wait;
5439         /* Do we need to do an open_to_lock_owner? */
5440         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5441                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5442                         goto out_release_lock_seqid;
5443                 }
5444                 data->arg.open_stateid = &state->open_stateid;
5445                 data->arg.new_lock_owner = 1;
5446                 data->res.open_seqid = data->arg.open_seqid;
5447         } else
5448                 data->arg.new_lock_owner = 0;
5449         if (!nfs4_valid_open_stateid(state)) {
5450                 data->rpc_status = -EBADF;
5451                 task->tk_action = NULL;
5452                 goto out_release_open_seqid;
5453         }
5454         data->timestamp = jiffies;
5455         if (nfs4_setup_sequence(data->server,
5456                                 &data->arg.seq_args,
5457                                 &data->res.seq_res,
5458                                 task) == 0)
5459                 return;
5460 out_release_open_seqid:
5461         nfs_release_seqid(data->arg.open_seqid);
5462 out_release_lock_seqid:
5463         nfs_release_seqid(data->arg.lock_seqid);
5464 out_wait:
5465         nfs4_sequence_done(task, &data->res.seq_res);
5466         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5467 }
5468
5469 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5470 {
5471         struct nfs4_lockdata *data = calldata;
5472
5473         dprintk("%s: begin!\n", __func__);
5474
5475         if (!nfs4_sequence_done(task, &data->res.seq_res))
5476                 return;
5477
5478         data->rpc_status = task->tk_status;
5479         if (data->arg.new_lock_owner != 0) {
5480                 if (data->rpc_status == 0)
5481                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5482                 else
5483                         goto out;
5484         }
5485         if (data->rpc_status == 0) {
5486                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5487                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5488                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5489         }
5490 out:
5491         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5492 }
5493
5494 static void nfs4_lock_release(void *calldata)
5495 {
5496         struct nfs4_lockdata *data = calldata;
5497
5498         dprintk("%s: begin!\n", __func__);
5499         nfs_free_seqid(data->arg.open_seqid);
5500         if (data->cancelled != 0) {
5501                 struct rpc_task *task;
5502                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5503                                 data->arg.lock_seqid);
5504                 if (!IS_ERR(task))
5505                         rpc_put_task_async(task);
5506                 dprintk("%s: cancelling lock!\n", __func__);
5507         } else
5508                 nfs_free_seqid(data->arg.lock_seqid);
5509         nfs4_put_lock_state(data->lsp);
5510         put_nfs_open_context(data->ctx);
5511         kfree(data);
5512         dprintk("%s: done!\n", __func__);
5513 }
5514
5515 static const struct rpc_call_ops nfs4_lock_ops = {
5516         .rpc_call_prepare = nfs4_lock_prepare,
5517         .rpc_call_done = nfs4_lock_done,
5518         .rpc_release = nfs4_lock_release,
5519 };
5520
5521 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5522 {
5523         switch (error) {
5524         case -NFS4ERR_ADMIN_REVOKED:
5525         case -NFS4ERR_BAD_STATEID:
5526                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5527                 if (new_lock_owner != 0 ||
5528                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5529                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5530                 break;
5531         case -NFS4ERR_STALE_STATEID:
5532                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5533         case -NFS4ERR_EXPIRED:
5534                 nfs4_schedule_lease_recovery(server->nfs_client);
5535         };
5536 }
5537
5538 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5539 {
5540         struct nfs4_lockdata *data;
5541         struct rpc_task *task;
5542         struct rpc_message msg = {
5543                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5544                 .rpc_cred = state->owner->so_cred,
5545         };
5546         struct rpc_task_setup task_setup_data = {
5547                 .rpc_client = NFS_CLIENT(state->inode),
5548                 .rpc_message = &msg,
5549                 .callback_ops = &nfs4_lock_ops,
5550                 .workqueue = nfsiod_workqueue,
5551                 .flags = RPC_TASK_ASYNC,
5552         };
5553         int ret;
5554
5555         dprintk("%s: begin!\n", __func__);
5556         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5557                         fl->fl_u.nfs4_fl.owner,
5558                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5559         if (data == NULL)
5560                 return -ENOMEM;
5561         if (IS_SETLKW(cmd))
5562                 data->arg.block = 1;
5563         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5564         msg.rpc_argp = &data->arg;
5565         msg.rpc_resp = &data->res;
5566         task_setup_data.callback_data = data;
5567         if (recovery_type > NFS_LOCK_NEW) {
5568                 if (recovery_type == NFS_LOCK_RECLAIM)
5569                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5570                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5571         }
5572         task = rpc_run_task(&task_setup_data);
5573         if (IS_ERR(task))
5574                 return PTR_ERR(task);
5575         ret = nfs4_wait_for_completion_rpc_task(task);
5576         if (ret == 0) {
5577                 ret = data->rpc_status;
5578                 if (ret)
5579                         nfs4_handle_setlk_error(data->server, data->lsp,
5580                                         data->arg.new_lock_owner, ret);
5581         } else
5582                 data->cancelled = 1;
5583         rpc_put_task(task);
5584         dprintk("%s: done, ret = %d!\n", __func__, ret);
5585         return ret;
5586 }
5587
5588 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5589 {
5590         struct nfs_server *server = NFS_SERVER(state->inode);
5591         struct nfs4_exception exception = {
5592                 .inode = state->inode,
5593         };
5594         int err;
5595
5596         do {
5597                 /* Cache the lock if possible... */
5598                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5599                         return 0;
5600                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5601                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5602                 if (err != -NFS4ERR_DELAY)
5603                         break;
5604                 nfs4_handle_exception(server, err, &exception);
5605         } while (exception.retry);
5606         return err;
5607 }
5608
5609 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5610 {
5611         struct nfs_server *server = NFS_SERVER(state->inode);
5612         struct nfs4_exception exception = {
5613                 .inode = state->inode,
5614         };
5615         int err;
5616
5617         err = nfs4_set_lock_state(state, request);
5618         if (err != 0)
5619                 return err;
5620         if (!recover_lost_locks) {
5621                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5622                 return 0;
5623         }
5624         do {
5625                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5626                         return 0;
5627                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5628                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5629                 switch (err) {
5630                 default:
5631                         goto out;
5632                 case -NFS4ERR_GRACE:
5633                 case -NFS4ERR_DELAY:
5634                         nfs4_handle_exception(server, err, &exception);
5635                         err = 0;
5636                 }
5637         } while (exception.retry);
5638 out:
5639         return err;
5640 }
5641
5642 #if defined(CONFIG_NFS_V4_1)
5643 /**
5644  * nfs41_check_expired_locks - possibly free a lock stateid
5645  *
5646  * @state: NFSv4 state for an inode
5647  *
5648  * Returns NFS_OK if recovery for this stateid is now finished.
5649  * Otherwise a negative NFS4ERR value is returned.
5650  */
5651 static int nfs41_check_expired_locks(struct nfs4_state *state)
5652 {
5653         int status, ret = -NFS4ERR_BAD_STATEID;
5654         struct nfs4_lock_state *lsp;
5655         struct nfs_server *server = NFS_SERVER(state->inode);
5656
5657         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5658                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5659                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5660
5661                         status = nfs41_test_stateid(server,
5662                                         &lsp->ls_stateid,
5663                                         cred);
5664                         trace_nfs4_test_lock_stateid(state, lsp, status);
5665                         if (status != NFS_OK) {
5666                                 /* Free the stateid unless the server
5667                                  * informs us the stateid is unrecognized. */
5668                                 if (status != -NFS4ERR_BAD_STATEID)
5669                                         nfs41_free_stateid(server,
5670                                                         &lsp->ls_stateid,
5671                                                         cred);
5672                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5673                                 ret = status;
5674                         }
5675                 }
5676         };
5677
5678         return ret;
5679 }
5680
5681 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5682 {
5683         int status = NFS_OK;
5684
5685         if (test_bit(LK_STATE_IN_USE, &state->flags))
5686                 status = nfs41_check_expired_locks(state);
5687         if (status != NFS_OK)
5688                 status = nfs4_lock_expired(state, request);
5689         return status;
5690 }
5691 #endif
5692
5693 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5694 {
5695         struct nfs4_state_owner *sp = state->owner;
5696         struct nfs_inode *nfsi = NFS_I(state->inode);
5697         unsigned char fl_flags = request->fl_flags;
5698         unsigned int seq;
5699         int status = -ENOLCK;
5700
5701         if ((fl_flags & FL_POSIX) &&
5702                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5703                 goto out;
5704         /* Is this a delegated open? */
5705         status = nfs4_set_lock_state(state, request);
5706         if (status != 0)
5707                 goto out;
5708         request->fl_flags |= FL_ACCESS;
5709         status = do_vfs_lock(request->fl_file, request);
5710         if (status < 0)
5711                 goto out;
5712         down_read(&nfsi->rwsem);
5713         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5714                 /* Yes: cache locks! */
5715                 /* ...but avoid races with delegation recall... */
5716                 request->fl_flags = fl_flags & ~FL_SLEEP;
5717                 status = do_vfs_lock(request->fl_file, request);
5718                 goto out_unlock;
5719         }
5720         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5721         up_read(&nfsi->rwsem);
5722         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5723         if (status != 0)
5724                 goto out;
5725         down_read(&nfsi->rwsem);
5726         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5727                 status = -NFS4ERR_DELAY;
5728                 goto out_unlock;
5729         }
5730         /* Note: we always want to sleep here! */
5731         request->fl_flags = fl_flags | FL_SLEEP;
5732         if (do_vfs_lock(request->fl_file, request) < 0)
5733                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5734                         "manager!\n", __func__);
5735 out_unlock:
5736         up_read(&nfsi->rwsem);
5737 out:
5738         request->fl_flags = fl_flags;
5739         return status;
5740 }
5741
5742 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5743 {
5744         struct nfs4_exception exception = {
5745                 .state = state,
5746                 .inode = state->inode,
5747         };
5748         int err;
5749
5750         do {
5751                 err = _nfs4_proc_setlk(state, cmd, request);
5752                 trace_nfs4_set_lock(request, state, cmd, err);
5753                 if (err == -NFS4ERR_DENIED)
5754                         err = -EAGAIN;
5755                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5756                                 err, &exception);
5757         } while (exception.retry);
5758         return err;
5759 }
5760
5761 static int
5762 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5763 {
5764         struct nfs_open_context *ctx;
5765         struct nfs4_state *state;
5766         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5767         int status;
5768
5769         /* verify open state */
5770         ctx = nfs_file_open_context(filp);
5771         state = ctx->state;
5772
5773         if (request->fl_start < 0 || request->fl_end < 0)
5774                 return -EINVAL;
5775
5776         if (IS_GETLK(cmd)) {
5777                 if (state != NULL)
5778                         return nfs4_proc_getlk(state, F_GETLK, request);
5779                 return 0;
5780         }
5781
5782         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5783                 return -EINVAL;
5784
5785         if (request->fl_type == F_UNLCK) {
5786                 if (state != NULL)
5787                         return nfs4_proc_unlck(state, cmd, request);
5788                 return 0;
5789         }
5790
5791         if (state == NULL)
5792                 return -ENOLCK;
5793         /*
5794          * Don't rely on the VFS having checked the file open mode,
5795          * since it won't do this for flock() locks.
5796          */
5797         switch (request->fl_type) {
5798         case F_RDLCK:
5799                 if (!(filp->f_mode & FMODE_READ))
5800                         return -EBADF;
5801                 break;
5802         case F_WRLCK:
5803                 if (!(filp->f_mode & FMODE_WRITE))
5804                         return -EBADF;
5805         }
5806
5807         do {
5808                 status = nfs4_proc_setlk(state, cmd, request);
5809                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5810                         break;
5811                 timeout = nfs4_set_lock_task_retry(timeout);
5812                 status = -ERESTARTSYS;
5813                 if (signalled())
5814                         break;
5815         } while(status < 0);
5816         return status;
5817 }
5818
5819 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5820 {
5821         struct nfs_server *server = NFS_SERVER(state->inode);
5822         int err;
5823
5824         err = nfs4_set_lock_state(state, fl);
5825         if (err != 0)
5826                 return err;
5827         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5828         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5829 }
5830
5831 struct nfs_release_lockowner_data {
5832         struct nfs4_lock_state *lsp;
5833         struct nfs_server *server;
5834         struct nfs_release_lockowner_args args;
5835         struct nfs4_sequence_args seq_args;
5836         struct nfs4_sequence_res seq_res;
5837         unsigned long timestamp;
5838 };
5839
5840 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5841 {
5842         struct nfs_release_lockowner_data *data = calldata;
5843         nfs40_setup_sequence(data->server,
5844                                 &data->seq_args, &data->seq_res, task);
5845         data->timestamp = jiffies;
5846 }
5847
5848 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5849 {
5850         struct nfs_release_lockowner_data *data = calldata;
5851         struct nfs_server *server = data->server;
5852
5853         nfs40_sequence_done(task, &data->seq_res);
5854
5855         switch (task->tk_status) {
5856         case 0:
5857                 renew_lease(server, data->timestamp);
5858                 break;
5859         case -NFS4ERR_STALE_CLIENTID:
5860         case -NFS4ERR_EXPIRED:
5861         case -NFS4ERR_LEASE_MOVED:
5862         case -NFS4ERR_DELAY:
5863                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5864                         rpc_restart_call_prepare(task);
5865         }
5866 }
5867
5868 static void nfs4_release_lockowner_release(void *calldata)
5869 {
5870         struct nfs_release_lockowner_data *data = calldata;
5871         nfs4_free_lock_state(data->server, data->lsp);
5872         kfree(calldata);
5873 }
5874
5875 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5876         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5877         .rpc_call_done = nfs4_release_lockowner_done,
5878         .rpc_release = nfs4_release_lockowner_release,
5879 };
5880
5881 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5882 {
5883         struct nfs_release_lockowner_data *data;
5884         struct rpc_message msg = {
5885                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5886         };
5887
5888         if (server->nfs_client->cl_mvops->minor_version != 0)
5889                 return -EINVAL;
5890
5891         data = kmalloc(sizeof(*data), GFP_NOFS);
5892         if (!data)
5893                 return -ENOMEM;
5894         nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5895         data->lsp = lsp;
5896         data->server = server;
5897         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5898         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5899         data->args.lock_owner.s_dev = server->s_dev;
5900
5901         msg.rpc_argp = &data->args;
5902         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5903         return 0;
5904 }
5905
5906 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5907
5908 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5909                                    const void *buf, size_t buflen,
5910                                    int flags, int type)
5911 {
5912         if (strcmp(key, "") != 0)
5913                 return -EINVAL;
5914
5915         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5916 }
5917
5918 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5919                                    void *buf, size_t buflen, int type)
5920 {
5921         if (strcmp(key, "") != 0)
5922                 return -EINVAL;
5923
5924         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5925 }
5926
5927 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5928                                        size_t list_len, const char *name,
5929                                        size_t name_len, int type)
5930 {
5931         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5932
5933         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5934                 return 0;
5935
5936         if (list && len <= list_len)
5937                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5938         return len;
5939 }
5940
5941 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5942 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5943 {
5944         return server->caps & NFS_CAP_SECURITY_LABEL;
5945 }
5946
5947 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5948                                    const void *buf, size_t buflen,
5949                                    int flags, int type)
5950 {
5951         if (security_ismaclabel(key))
5952                 return nfs4_set_security_label(dentry, buf, buflen);
5953
5954         return -EOPNOTSUPP;
5955 }
5956
5957 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5958                                    void *buf, size_t buflen, int type)
5959 {
5960         if (security_ismaclabel(key))
5961                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5962         return -EOPNOTSUPP;
5963 }
5964
5965 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5966                                        size_t list_len, const char *name,
5967                                        size_t name_len, int type)
5968 {
5969         size_t len = 0;
5970
5971         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5972                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5973                 if (list && len <= list_len)
5974                         security_inode_listsecurity(dentry->d_inode, list, len);
5975         }
5976         return len;
5977 }
5978
5979 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5980         .prefix = XATTR_SECURITY_PREFIX,
5981         .list   = nfs4_xattr_list_nfs4_label,
5982         .get    = nfs4_xattr_get_nfs4_label,
5983         .set    = nfs4_xattr_set_nfs4_label,
5984 };
5985 #endif
5986
5987
5988 /*
5989  * nfs_fhget will use either the mounted_on_fileid or the fileid
5990  */
5991 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5992 {
5993         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5994                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5995               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5996               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5997                 return;
5998
5999         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6000                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6001         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6002         fattr->nlink = 2;
6003 }
6004
6005 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6006                                    const struct qstr *name,
6007                                    struct nfs4_fs_locations *fs_locations,
6008                                    struct page *page)
6009 {
6010         struct nfs_server *server = NFS_SERVER(dir);
6011         u32 bitmask[3] = {
6012                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6013         };
6014         struct nfs4_fs_locations_arg args = {
6015                 .dir_fh = NFS_FH(dir),
6016                 .name = name,
6017                 .page = page,
6018                 .bitmask = bitmask,
6019         };
6020         struct nfs4_fs_locations_res res = {
6021                 .fs_locations = fs_locations,
6022         };
6023         struct rpc_message msg = {
6024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6025                 .rpc_argp = &args,
6026                 .rpc_resp = &res,
6027         };
6028         int status;
6029
6030         dprintk("%s: start\n", __func__);
6031
6032         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6033          * is not supported */
6034         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6035                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6036         else
6037                 bitmask[0] |= FATTR4_WORD0_FILEID;
6038
6039         nfs_fattr_init(&fs_locations->fattr);
6040         fs_locations->server = server;
6041         fs_locations->nlocations = 0;
6042         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6043         dprintk("%s: returned status = %d\n", __func__, status);
6044         return status;
6045 }
6046
6047 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6048                            const struct qstr *name,
6049                            struct nfs4_fs_locations *fs_locations,
6050                            struct page *page)
6051 {
6052         struct nfs4_exception exception = { };
6053         int err;
6054         do {
6055                 err = _nfs4_proc_fs_locations(client, dir, name,
6056                                 fs_locations, page);
6057                 trace_nfs4_get_fs_locations(dir, name, err);
6058                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6059                                 &exception);
6060         } while (exception.retry);
6061         return err;
6062 }
6063
6064 /*
6065  * This operation also signals the server that this client is
6066  * performing migration recovery.  The server can stop returning
6067  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6068  * appended to this compound to identify the client ID which is
6069  * performing recovery.
6070  */
6071 static int _nfs40_proc_get_locations(struct inode *inode,
6072                                      struct nfs4_fs_locations *locations,
6073                                      struct page *page, struct rpc_cred *cred)
6074 {
6075         struct nfs_server *server = NFS_SERVER(inode);
6076         struct rpc_clnt *clnt = server->client;
6077         u32 bitmask[2] = {
6078                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6079         };
6080         struct nfs4_fs_locations_arg args = {
6081                 .clientid       = server->nfs_client->cl_clientid,
6082                 .fh             = NFS_FH(inode),
6083                 .page           = page,
6084                 .bitmask        = bitmask,
6085                 .migration      = 1,            /* skip LOOKUP */
6086                 .renew          = 1,            /* append RENEW */
6087         };
6088         struct nfs4_fs_locations_res res = {
6089                 .fs_locations   = locations,
6090                 .migration      = 1,
6091                 .renew          = 1,
6092         };
6093         struct rpc_message msg = {
6094                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6095                 .rpc_argp       = &args,
6096                 .rpc_resp       = &res,
6097                 .rpc_cred       = cred,
6098         };
6099         unsigned long now = jiffies;
6100         int status;
6101
6102         nfs_fattr_init(&locations->fattr);
6103         locations->server = server;
6104         locations->nlocations = 0;
6105
6106         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6107         nfs4_set_sequence_privileged(&args.seq_args);
6108         status = nfs4_call_sync_sequence(clnt, server, &msg,
6109                                         &args.seq_args, &res.seq_res);
6110         if (status)
6111                 return status;
6112
6113         renew_lease(server, now);
6114         return 0;
6115 }
6116
6117 #ifdef CONFIG_NFS_V4_1
6118
6119 /*
6120  * This operation also signals the server that this client is
6121  * performing migration recovery.  The server can stop asserting
6122  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6123  * performing this operation is identified in the SEQUENCE
6124  * operation in this compound.
6125  *
6126  * When the client supports GETATTR(fs_locations_info), it can
6127  * be plumbed in here.
6128  */
6129 static int _nfs41_proc_get_locations(struct inode *inode,
6130                                      struct nfs4_fs_locations *locations,
6131                                      struct page *page, struct rpc_cred *cred)
6132 {
6133         struct nfs_server *server = NFS_SERVER(inode);
6134         struct rpc_clnt *clnt = server->client;
6135         u32 bitmask[2] = {
6136                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6137         };
6138         struct nfs4_fs_locations_arg args = {
6139                 .fh             = NFS_FH(inode),
6140                 .page           = page,
6141                 .bitmask        = bitmask,
6142                 .migration      = 1,            /* skip LOOKUP */
6143         };
6144         struct nfs4_fs_locations_res res = {
6145                 .fs_locations   = locations,
6146                 .migration      = 1,
6147         };
6148         struct rpc_message msg = {
6149                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6150                 .rpc_argp       = &args,
6151                 .rpc_resp       = &res,
6152                 .rpc_cred       = cred,
6153         };
6154         int status;
6155
6156         nfs_fattr_init(&locations->fattr);
6157         locations->server = server;
6158         locations->nlocations = 0;
6159
6160         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6161         nfs4_set_sequence_privileged(&args.seq_args);
6162         status = nfs4_call_sync_sequence(clnt, server, &msg,
6163                                         &args.seq_args, &res.seq_res);
6164         if (status == NFS4_OK &&
6165             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6166                 status = -NFS4ERR_LEASE_MOVED;
6167         return status;
6168 }
6169
6170 #endif  /* CONFIG_NFS_V4_1 */
6171
6172 /**
6173  * nfs4_proc_get_locations - discover locations for a migrated FSID
6174  * @inode: inode on FSID that is migrating
6175  * @locations: result of query
6176  * @page: buffer
6177  * @cred: credential to use for this operation
6178  *
6179  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6180  * operation failed, or a negative errno if a local error occurred.
6181  *
6182  * On success, "locations" is filled in, but if the server has
6183  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6184  * asserted.
6185  *
6186  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6187  * from this client that require migration recovery.
6188  */
6189 int nfs4_proc_get_locations(struct inode *inode,
6190                             struct nfs4_fs_locations *locations,
6191                             struct page *page, struct rpc_cred *cred)
6192 {
6193         struct nfs_server *server = NFS_SERVER(inode);
6194         struct nfs_client *clp = server->nfs_client;
6195         const struct nfs4_mig_recovery_ops *ops =
6196                                         clp->cl_mvops->mig_recovery_ops;
6197         struct nfs4_exception exception = { };
6198         int status;
6199
6200         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6201                 (unsigned long long)server->fsid.major,
6202                 (unsigned long long)server->fsid.minor,
6203                 clp->cl_hostname);
6204         nfs_display_fhandle(NFS_FH(inode), __func__);
6205
6206         do {
6207                 status = ops->get_locations(inode, locations, page, cred);
6208                 if (status != -NFS4ERR_DELAY)
6209                         break;
6210                 nfs4_handle_exception(server, status, &exception);
6211         } while (exception.retry);
6212         return status;
6213 }
6214
6215 /*
6216  * This operation also signals the server that this client is
6217  * performing "lease moved" recovery.  The server can stop
6218  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6219  * is appended to this compound to identify the client ID which is
6220  * performing recovery.
6221  */
6222 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6223 {
6224         struct nfs_server *server = NFS_SERVER(inode);
6225         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6226         struct rpc_clnt *clnt = server->client;
6227         struct nfs4_fsid_present_arg args = {
6228                 .fh             = NFS_FH(inode),
6229                 .clientid       = clp->cl_clientid,
6230                 .renew          = 1,            /* append RENEW */
6231         };
6232         struct nfs4_fsid_present_res res = {
6233                 .renew          = 1,
6234         };
6235         struct rpc_message msg = {
6236                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6237                 .rpc_argp       = &args,
6238                 .rpc_resp       = &res,
6239                 .rpc_cred       = cred,
6240         };
6241         unsigned long now = jiffies;
6242         int status;
6243
6244         res.fh = nfs_alloc_fhandle();
6245         if (res.fh == NULL)
6246                 return -ENOMEM;
6247
6248         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6249         nfs4_set_sequence_privileged(&args.seq_args);
6250         status = nfs4_call_sync_sequence(clnt, server, &msg,
6251                                                 &args.seq_args, &res.seq_res);
6252         nfs_free_fhandle(res.fh);
6253         if (status)
6254                 return status;
6255
6256         do_renew_lease(clp, now);
6257         return 0;
6258 }
6259
6260 #ifdef CONFIG_NFS_V4_1
6261
6262 /*
6263  * This operation also signals the server that this client is
6264  * performing "lease moved" recovery.  The server can stop asserting
6265  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6266  * this operation is identified in the SEQUENCE operation in this
6267  * compound.
6268  */
6269 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6270 {
6271         struct nfs_server *server = NFS_SERVER(inode);
6272         struct rpc_clnt *clnt = server->client;
6273         struct nfs4_fsid_present_arg args = {
6274                 .fh             = NFS_FH(inode),
6275         };
6276         struct nfs4_fsid_present_res res = {
6277         };
6278         struct rpc_message msg = {
6279                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6280                 .rpc_argp       = &args,
6281                 .rpc_resp       = &res,
6282                 .rpc_cred       = cred,
6283         };
6284         int status;
6285
6286         res.fh = nfs_alloc_fhandle();
6287         if (res.fh == NULL)
6288                 return -ENOMEM;
6289
6290         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6291         nfs4_set_sequence_privileged(&args.seq_args);
6292         status = nfs4_call_sync_sequence(clnt, server, &msg,
6293                                                 &args.seq_args, &res.seq_res);
6294         nfs_free_fhandle(res.fh);
6295         if (status == NFS4_OK &&
6296             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6297                 status = -NFS4ERR_LEASE_MOVED;
6298         return status;
6299 }
6300
6301 #endif  /* CONFIG_NFS_V4_1 */
6302
6303 /**
6304  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6305  * @inode: inode on FSID to check
6306  * @cred: credential to use for this operation
6307  *
6308  * Server indicates whether the FSID is present, moved, or not
6309  * recognized.  This operation is necessary to clear a LEASE_MOVED
6310  * condition for this client ID.
6311  *
6312  * Returns NFS4_OK if the FSID is present on this server,
6313  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6314  *  NFS4ERR code if some error occurred on the server, or a
6315  *  negative errno if a local failure occurred.
6316  */
6317 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6318 {
6319         struct nfs_server *server = NFS_SERVER(inode);
6320         struct nfs_client *clp = server->nfs_client;
6321         const struct nfs4_mig_recovery_ops *ops =
6322                                         clp->cl_mvops->mig_recovery_ops;
6323         struct nfs4_exception exception = { };
6324         int status;
6325
6326         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6327                 (unsigned long long)server->fsid.major,
6328                 (unsigned long long)server->fsid.minor,
6329                 clp->cl_hostname);
6330         nfs_display_fhandle(NFS_FH(inode), __func__);
6331
6332         do {
6333                 status = ops->fsid_present(inode, cred);
6334                 if (status != -NFS4ERR_DELAY)
6335                         break;
6336                 nfs4_handle_exception(server, status, &exception);
6337         } while (exception.retry);
6338         return status;
6339 }
6340
6341 /**
6342  * If 'use_integrity' is true and the state managment nfs_client
6343  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6344  * and the machine credential as per RFC3530bis and RFC5661 Security
6345  * Considerations sections. Otherwise, just use the user cred with the
6346  * filesystem's rpc_client.
6347  */
6348 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6349 {
6350         int status;
6351         struct nfs4_secinfo_arg args = {
6352                 .dir_fh = NFS_FH(dir),
6353                 .name   = name,
6354         };
6355         struct nfs4_secinfo_res res = {
6356                 .flavors     = flavors,
6357         };
6358         struct rpc_message msg = {
6359                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6360                 .rpc_argp = &args,
6361                 .rpc_resp = &res,
6362         };
6363         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6364         struct rpc_cred *cred = NULL;
6365
6366         if (use_integrity) {
6367                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6368                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6369                 msg.rpc_cred = cred;
6370         }
6371
6372         dprintk("NFS call  secinfo %s\n", name->name);
6373
6374         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6375                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6376
6377         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6378                                 &res.seq_res, 0);
6379         dprintk("NFS reply  secinfo: %d\n", status);
6380
6381         if (cred)
6382                 put_rpccred(cred);
6383
6384         return status;
6385 }
6386
6387 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6388                       struct nfs4_secinfo_flavors *flavors)
6389 {
6390         struct nfs4_exception exception = { };
6391         int err;
6392         do {
6393                 err = -NFS4ERR_WRONGSEC;
6394
6395                 /* try to use integrity protection with machine cred */
6396                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6397                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6398
6399                 /*
6400                  * if unable to use integrity protection, or SECINFO with
6401                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6402                  * disallowed by spec, but exists in deployed servers) use
6403                  * the current filesystem's rpc_client and the user cred.
6404                  */
6405                 if (err == -NFS4ERR_WRONGSEC)
6406                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6407
6408                 trace_nfs4_secinfo(dir, name, err);
6409                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6410                                 &exception);
6411         } while (exception.retry);
6412         return err;
6413 }
6414
6415 #ifdef CONFIG_NFS_V4_1
6416 /*
6417  * Check the exchange flags returned by the server for invalid flags, having
6418  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6419  * DS flags set.
6420  */
6421 static int nfs4_check_cl_exchange_flags(u32 flags)
6422 {
6423         if (flags & ~EXCHGID4_FLAG_MASK_R)
6424                 goto out_inval;
6425         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6426             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6427                 goto out_inval;
6428         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6429                 goto out_inval;
6430         return NFS_OK;
6431 out_inval:
6432         return -NFS4ERR_INVAL;
6433 }
6434
6435 static bool
6436 nfs41_same_server_scope(struct nfs41_server_scope *a,
6437                         struct nfs41_server_scope *b)
6438 {
6439         if (a->server_scope_sz == b->server_scope_sz &&
6440             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6441                 return true;
6442
6443         return false;
6444 }
6445
6446 /*
6447  * nfs4_proc_bind_conn_to_session()
6448  *
6449  * The 4.1 client currently uses the same TCP connection for the
6450  * fore and backchannel.
6451  */
6452 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6453 {
6454         int status;
6455         struct nfs41_bind_conn_to_session_res res;
6456         struct rpc_message msg = {
6457                 .rpc_proc =
6458                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6459                 .rpc_argp = clp,
6460                 .rpc_resp = &res,
6461                 .rpc_cred = cred,
6462         };
6463
6464         dprintk("--> %s\n", __func__);
6465
6466         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6467         if (unlikely(res.session == NULL)) {
6468                 status = -ENOMEM;
6469                 goto out;
6470         }
6471
6472         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6473         trace_nfs4_bind_conn_to_session(clp, status);
6474         if (status == 0) {
6475                 if (memcmp(res.session->sess_id.data,
6476                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6477                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6478                         status = -EIO;
6479                         goto out_session;
6480                 }
6481                 if (res.dir != NFS4_CDFS4_BOTH) {
6482                         dprintk("NFS: %s: Unexpected direction from server\n",
6483                                 __func__);
6484                         status = -EIO;
6485                         goto out_session;
6486                 }
6487                 if (res.use_conn_in_rdma_mode) {
6488                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6489                                 __func__);
6490                         status = -EIO;
6491                         goto out_session;
6492                 }
6493         }
6494 out_session:
6495         kfree(res.session);
6496 out:
6497         dprintk("<-- %s status= %d\n", __func__, status);
6498         return status;
6499 }
6500
6501 /*
6502  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6503  * and operations we'd like to see to enable certain features in the allow map
6504  */
6505 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6506         .how = SP4_MACH_CRED,
6507         .enforce.u.words = {
6508                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6509                       1 << (OP_EXCHANGE_ID - 32) |
6510                       1 << (OP_CREATE_SESSION - 32) |
6511                       1 << (OP_DESTROY_SESSION - 32) |
6512                       1 << (OP_DESTROY_CLIENTID - 32)
6513         },
6514         .allow.u.words = {
6515                 [0] = 1 << (OP_CLOSE) |
6516                       1 << (OP_LOCKU) |
6517                       1 << (OP_COMMIT),
6518                 [1] = 1 << (OP_SECINFO - 32) |
6519                       1 << (OP_SECINFO_NO_NAME - 32) |
6520                       1 << (OP_TEST_STATEID - 32) |
6521                       1 << (OP_FREE_STATEID - 32) |
6522                       1 << (OP_WRITE - 32)
6523         }
6524 };
6525
6526 /*
6527  * Select the state protection mode for client `clp' given the server results
6528  * from exchange_id in `sp'.
6529  *
6530  * Returns 0 on success, negative errno otherwise.
6531  */
6532 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6533                                  struct nfs41_state_protection *sp)
6534 {
6535         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6536                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6537                       1 << (OP_EXCHANGE_ID - 32) |
6538                       1 << (OP_CREATE_SESSION - 32) |
6539                       1 << (OP_DESTROY_SESSION - 32) |
6540                       1 << (OP_DESTROY_CLIENTID - 32)
6541         };
6542         unsigned int i;
6543
6544         if (sp->how == SP4_MACH_CRED) {
6545                 /* Print state protect result */
6546                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6547                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6548                         if (test_bit(i, sp->enforce.u.longs))
6549                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6550                         if (test_bit(i, sp->allow.u.longs))
6551                                 dfprintk(MOUNT, "  allow op %d\n", i);
6552                 }
6553
6554                 /* make sure nothing is on enforce list that isn't supported */
6555                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6556                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6557                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6558                                 return -EINVAL;
6559                         }
6560                 }
6561
6562                 /*
6563                  * Minimal mode - state operations are allowed to use machine
6564                  * credential.  Note this already happens by default, so the
6565                  * client doesn't have to do anything more than the negotiation.
6566                  *
6567                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6568                  *       we're already using the machine cred for exchange_id
6569                  *       and will never use a different cred.
6570                  */
6571                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6572                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6573                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6574                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6575                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6576                         dfprintk(MOUNT, "  minimal mode enabled\n");
6577                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6578                 } else {
6579                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6580                         return -EINVAL;
6581                 }
6582
6583                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6584                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6585                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6586                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6587                 }
6588
6589                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6590                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6591                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6592                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6593                 }
6594
6595                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6596                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6597                         dfprintk(MOUNT, "  stateid mode enabled\n");
6598                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6599                 }
6600
6601                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6602                         dfprintk(MOUNT, "  write mode enabled\n");
6603                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6604                 }
6605
6606                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6607                         dfprintk(MOUNT, "  commit mode enabled\n");
6608                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6609                 }
6610         }
6611
6612         return 0;
6613 }
6614
6615 /*
6616  * _nfs4_proc_exchange_id()
6617  *
6618  * Wrapper for EXCHANGE_ID operation.
6619  */
6620 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6621         u32 sp4_how)
6622 {
6623         nfs4_verifier verifier;
6624         struct nfs41_exchange_id_args args = {
6625                 .verifier = &verifier,
6626                 .client = clp,
6627 #ifdef CONFIG_NFS_V4_1_MIGRATION
6628                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6629                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6630                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6631 #else
6632                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6633                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6634 #endif
6635         };
6636         struct nfs41_exchange_id_res res = {
6637                 0
6638         };
6639         int status;
6640         struct rpc_message msg = {
6641                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6642                 .rpc_argp = &args,
6643                 .rpc_resp = &res,
6644                 .rpc_cred = cred,
6645         };
6646
6647         nfs4_init_boot_verifier(clp, &verifier);
6648         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6649                                                         sizeof(args.id));
6650         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6651                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6652                 args.id_len, args.id);
6653
6654         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6655                                         GFP_NOFS);
6656         if (unlikely(res.server_owner == NULL)) {
6657                 status = -ENOMEM;
6658                 goto out;
6659         }
6660
6661         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6662                                         GFP_NOFS);
6663         if (unlikely(res.server_scope == NULL)) {
6664                 status = -ENOMEM;
6665                 goto out_server_owner;
6666         }
6667
6668         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6669         if (unlikely(res.impl_id == NULL)) {
6670                 status = -ENOMEM;
6671                 goto out_server_scope;
6672         }
6673
6674         switch (sp4_how) {
6675         case SP4_NONE:
6676                 args.state_protect.how = SP4_NONE;
6677                 break;
6678
6679         case SP4_MACH_CRED:
6680                 args.state_protect = nfs4_sp4_mach_cred_request;
6681                 break;
6682
6683         default:
6684                 /* unsupported! */
6685                 WARN_ON_ONCE(1);
6686                 status = -EINVAL;
6687                 goto out_server_scope;
6688         }
6689
6690         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6691         trace_nfs4_exchange_id(clp, status);
6692         if (status == 0)
6693                 status = nfs4_check_cl_exchange_flags(res.flags);
6694
6695         if (status == 0)
6696                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6697
6698         if (status == 0) {
6699                 clp->cl_clientid = res.clientid;
6700                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6701                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6702                         clp->cl_seqid = res.seqid;
6703
6704                 kfree(clp->cl_serverowner);
6705                 clp->cl_serverowner = res.server_owner;
6706                 res.server_owner = NULL;
6707
6708                 /* use the most recent implementation id */
6709                 kfree(clp->cl_implid);
6710                 clp->cl_implid = res.impl_id;
6711
6712                 if (clp->cl_serverscope != NULL &&
6713                     !nfs41_same_server_scope(clp->cl_serverscope,
6714                                              res.server_scope)) {
6715                         dprintk("%s: server_scope mismatch detected\n",
6716                                 __func__);
6717                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6718                         kfree(clp->cl_serverscope);
6719                         clp->cl_serverscope = NULL;
6720                 }
6721
6722                 if (clp->cl_serverscope == NULL) {
6723                         clp->cl_serverscope = res.server_scope;
6724                         goto out;
6725                 }
6726         } else
6727                 kfree(res.impl_id);
6728
6729 out_server_owner:
6730         kfree(res.server_owner);
6731 out_server_scope:
6732         kfree(res.server_scope);
6733 out:
6734         if (clp->cl_implid != NULL)
6735                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6736                         "domain: %s, name: %s, date: %llu,%u\n",
6737                         clp->cl_implid->domain, clp->cl_implid->name,
6738                         clp->cl_implid->date.seconds,
6739                         clp->cl_implid->date.nseconds);
6740         dprintk("NFS reply exchange_id: %d\n", status);
6741         return status;
6742 }
6743
6744 /*
6745  * nfs4_proc_exchange_id()
6746  *
6747  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6748  *
6749  * Since the clientid has expired, all compounds using sessions
6750  * associated with the stale clientid will be returning
6751  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6752  * be in some phase of session reset.
6753  *
6754  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6755  */
6756 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6757 {
6758         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6759         int status;
6760
6761         /* try SP4_MACH_CRED if krb5i/p */
6762         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6763             authflavor == RPC_AUTH_GSS_KRB5P) {
6764                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6765                 if (!status)
6766                         return 0;
6767         }
6768
6769         /* try SP4_NONE */
6770         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6771 }
6772
6773 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6774                 struct rpc_cred *cred)
6775 {
6776         struct rpc_message msg = {
6777                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6778                 .rpc_argp = clp,
6779                 .rpc_cred = cred,
6780         };
6781         int status;
6782
6783         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6784         trace_nfs4_destroy_clientid(clp, status);
6785         if (status)
6786                 dprintk("NFS: Got error %d from the server %s on "
6787                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6788         return status;
6789 }
6790
6791 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6792                 struct rpc_cred *cred)
6793 {
6794         unsigned int loop;
6795         int ret;
6796
6797         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6798                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6799                 switch (ret) {
6800                 case -NFS4ERR_DELAY:
6801                 case -NFS4ERR_CLIENTID_BUSY:
6802                         ssleep(1);
6803                         break;
6804                 default:
6805                         return ret;
6806                 }
6807         }
6808         return 0;
6809 }
6810
6811 int nfs4_destroy_clientid(struct nfs_client *clp)
6812 {
6813         struct rpc_cred *cred;
6814         int ret = 0;
6815
6816         if (clp->cl_mvops->minor_version < 1)
6817                 goto out;
6818         if (clp->cl_exchange_flags == 0)
6819                 goto out;
6820         if (clp->cl_preserve_clid)
6821                 goto out;
6822         cred = nfs4_get_clid_cred(clp);
6823         ret = nfs4_proc_destroy_clientid(clp, cred);
6824         if (cred)
6825                 put_rpccred(cred);
6826         switch (ret) {
6827         case 0:
6828         case -NFS4ERR_STALE_CLIENTID:
6829                 clp->cl_exchange_flags = 0;
6830         }
6831 out:
6832         return ret;
6833 }
6834
6835 struct nfs4_get_lease_time_data {
6836         struct nfs4_get_lease_time_args *args;
6837         struct nfs4_get_lease_time_res *res;
6838         struct nfs_client *clp;
6839 };
6840
6841 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6842                                         void *calldata)
6843 {
6844         struct nfs4_get_lease_time_data *data =
6845                         (struct nfs4_get_lease_time_data *)calldata;
6846
6847         dprintk("--> %s\n", __func__);
6848         /* just setup sequence, do not trigger session recovery
6849            since we're invoked within one */
6850         nfs41_setup_sequence(data->clp->cl_session,
6851                         &data->args->la_seq_args,
6852                         &data->res->lr_seq_res,
6853                         task);
6854         dprintk("<-- %s\n", __func__);
6855 }
6856
6857 /*
6858  * Called from nfs4_state_manager thread for session setup, so don't recover
6859  * from sequence operation or clientid errors.
6860  */
6861 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6862 {
6863         struct nfs4_get_lease_time_data *data =
6864                         (struct nfs4_get_lease_time_data *)calldata;
6865
6866         dprintk("--> %s\n", __func__);
6867         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6868                 return;
6869         switch (task->tk_status) {
6870         case -NFS4ERR_DELAY:
6871         case -NFS4ERR_GRACE:
6872                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6873                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6874                 task->tk_status = 0;
6875                 /* fall through */
6876         case -NFS4ERR_RETRY_UNCACHED_REP:
6877                 rpc_restart_call_prepare(task);
6878                 return;
6879         }
6880         dprintk("<-- %s\n", __func__);
6881 }
6882
6883 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6884         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6885         .rpc_call_done = nfs4_get_lease_time_done,
6886 };
6887
6888 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6889 {
6890         struct rpc_task *task;
6891         struct nfs4_get_lease_time_args args;
6892         struct nfs4_get_lease_time_res res = {
6893                 .lr_fsinfo = fsinfo,
6894         };
6895         struct nfs4_get_lease_time_data data = {
6896                 .args = &args,
6897                 .res = &res,
6898                 .clp = clp,
6899         };
6900         struct rpc_message msg = {
6901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6902                 .rpc_argp = &args,
6903                 .rpc_resp = &res,
6904         };
6905         struct rpc_task_setup task_setup = {
6906                 .rpc_client = clp->cl_rpcclient,
6907                 .rpc_message = &msg,
6908                 .callback_ops = &nfs4_get_lease_time_ops,
6909                 .callback_data = &data,
6910                 .flags = RPC_TASK_TIMEOUT,
6911         };
6912         int status;
6913
6914         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6915         nfs4_set_sequence_privileged(&args.la_seq_args);
6916         dprintk("--> %s\n", __func__);
6917         task = rpc_run_task(&task_setup);
6918
6919         if (IS_ERR(task))
6920                 status = PTR_ERR(task);
6921         else {
6922                 status = task->tk_status;
6923                 rpc_put_task(task);
6924         }
6925         dprintk("<-- %s return %d\n", __func__, status);
6926
6927         return status;
6928 }
6929
6930 /*
6931  * Initialize the values to be used by the client in CREATE_SESSION
6932  * If nfs4_init_session set the fore channel request and response sizes,
6933  * use them.
6934  *
6935  * Set the back channel max_resp_sz_cached to zero to force the client to
6936  * always set csa_cachethis to FALSE because the current implementation
6937  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6938  */
6939 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6940 {
6941         unsigned int max_rqst_sz, max_resp_sz;
6942
6943         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6944         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6945
6946         /* Fore channel attributes */
6947         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6948         args->fc_attrs.max_resp_sz = max_resp_sz;
6949         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6950         args->fc_attrs.max_reqs = max_session_slots;
6951
6952         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6953                 "max_ops=%u max_reqs=%u\n",
6954                 __func__,
6955                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6956                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6957
6958         /* Back channel attributes */
6959         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6960         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6961         args->bc_attrs.max_resp_sz_cached = 0;
6962         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6963         args->bc_attrs.max_reqs = 1;
6964
6965         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6966                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6967                 __func__,
6968                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6969                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6970                 args->bc_attrs.max_reqs);
6971 }
6972
6973 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6974 {
6975         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6976         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6977
6978         if (rcvd->max_resp_sz > sent->max_resp_sz)
6979                 return -EINVAL;
6980         /*
6981          * Our requested max_ops is the minimum we need; we're not
6982          * prepared to break up compounds into smaller pieces than that.
6983          * So, no point even trying to continue if the server won't
6984          * cooperate:
6985          */
6986         if (rcvd->max_ops < sent->max_ops)
6987                 return -EINVAL;
6988         if (rcvd->max_reqs == 0)
6989                 return -EINVAL;
6990         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6991                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6992         return 0;
6993 }
6994
6995 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6996 {
6997         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6998         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6999
7000         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7001                 return -EINVAL;
7002         if (rcvd->max_resp_sz < sent->max_resp_sz)
7003                 return -EINVAL;
7004         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7005                 return -EINVAL;
7006         /* These would render the backchannel useless: */
7007         if (rcvd->max_ops != sent->max_ops)
7008                 return -EINVAL;
7009         if (rcvd->max_reqs != sent->max_reqs)
7010                 return -EINVAL;
7011         return 0;
7012 }
7013
7014 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7015                                      struct nfs4_session *session)
7016 {
7017         int ret;
7018
7019         ret = nfs4_verify_fore_channel_attrs(args, session);
7020         if (ret)
7021                 return ret;
7022         return nfs4_verify_back_channel_attrs(args, session);
7023 }
7024
7025 static int _nfs4_proc_create_session(struct nfs_client *clp,
7026                 struct rpc_cred *cred)
7027 {
7028         struct nfs4_session *session = clp->cl_session;
7029         struct nfs41_create_session_args args = {
7030                 .client = clp,
7031                 .cb_program = NFS4_CALLBACK,
7032         };
7033         struct nfs41_create_session_res res = {
7034                 .client = clp,
7035         };
7036         struct rpc_message msg = {
7037                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7038                 .rpc_argp = &args,
7039                 .rpc_resp = &res,
7040                 .rpc_cred = cred,
7041         };
7042         int status;
7043
7044         nfs4_init_channel_attrs(&args);
7045         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7046
7047         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7048         trace_nfs4_create_session(clp, status);
7049
7050         if (!status) {
7051                 /* Verify the session's negotiated channel_attrs values */
7052                 status = nfs4_verify_channel_attrs(&args, session);
7053                 /* Increment the clientid slot sequence id */
7054                 clp->cl_seqid++;
7055         }
7056
7057         return status;
7058 }
7059
7060 /*
7061  * Issues a CREATE_SESSION operation to the server.
7062  * It is the responsibility of the caller to verify the session is
7063  * expired before calling this routine.
7064  */
7065 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7066 {
7067         int status;
7068         unsigned *ptr;
7069         struct nfs4_session *session = clp->cl_session;
7070
7071         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7072
7073         status = _nfs4_proc_create_session(clp, cred);
7074         if (status)
7075                 goto out;
7076
7077         /* Init or reset the session slot tables */
7078         status = nfs4_setup_session_slot_tables(session);
7079         dprintk("slot table setup returned %d\n", status);
7080         if (status)
7081                 goto out;
7082
7083         ptr = (unsigned *)&session->sess_id.data[0];
7084         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7085                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7086 out:
7087         dprintk("<-- %s\n", __func__);
7088         return status;
7089 }
7090
7091 /*
7092  * Issue the over-the-wire RPC DESTROY_SESSION.
7093  * The caller must serialize access to this routine.
7094  */
7095 int nfs4_proc_destroy_session(struct nfs4_session *session,
7096                 struct rpc_cred *cred)
7097 {
7098         struct rpc_message msg = {
7099                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7100                 .rpc_argp = session,
7101                 .rpc_cred = cred,
7102         };
7103         int status = 0;
7104
7105         dprintk("--> nfs4_proc_destroy_session\n");
7106
7107         /* session is still being setup */
7108         if (session->clp->cl_cons_state != NFS_CS_READY)
7109                 return status;
7110
7111         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7112         trace_nfs4_destroy_session(session->clp, status);
7113
7114         if (status)
7115                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7116                         "Session has been destroyed regardless...\n", status);
7117
7118         dprintk("<-- nfs4_proc_destroy_session\n");
7119         return status;
7120 }
7121
7122 /*
7123  * Renew the cl_session lease.
7124  */
7125 struct nfs4_sequence_data {
7126         struct nfs_client *clp;
7127         struct nfs4_sequence_args args;
7128         struct nfs4_sequence_res res;
7129 };
7130
7131 static void nfs41_sequence_release(void *data)
7132 {
7133         struct nfs4_sequence_data *calldata = data;
7134         struct nfs_client *clp = calldata->clp;
7135
7136         if (atomic_read(&clp->cl_count) > 1)
7137                 nfs4_schedule_state_renewal(clp);
7138         nfs_put_client(clp);
7139         kfree(calldata);
7140 }
7141
7142 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7143 {
7144         switch(task->tk_status) {
7145         case -NFS4ERR_DELAY:
7146                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7147                 return -EAGAIN;
7148         default:
7149                 nfs4_schedule_lease_recovery(clp);
7150         }
7151         return 0;
7152 }
7153
7154 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7155 {
7156         struct nfs4_sequence_data *calldata = data;
7157         struct nfs_client *clp = calldata->clp;
7158
7159         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7160                 return;
7161
7162         trace_nfs4_sequence(clp, task->tk_status);
7163         if (task->tk_status < 0) {
7164                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7165                 if (atomic_read(&clp->cl_count) == 1)
7166                         goto out;
7167
7168                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7169                         rpc_restart_call_prepare(task);
7170                         return;
7171                 }
7172         }
7173         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7174 out:
7175         dprintk("<-- %s\n", __func__);
7176 }
7177
7178 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7179 {
7180         struct nfs4_sequence_data *calldata = data;
7181         struct nfs_client *clp = calldata->clp;
7182         struct nfs4_sequence_args *args;
7183         struct nfs4_sequence_res *res;
7184
7185         args = task->tk_msg.rpc_argp;
7186         res = task->tk_msg.rpc_resp;
7187
7188         nfs41_setup_sequence(clp->cl_session, args, res, task);
7189 }
7190
7191 static const struct rpc_call_ops nfs41_sequence_ops = {
7192         .rpc_call_done = nfs41_sequence_call_done,
7193         .rpc_call_prepare = nfs41_sequence_prepare,
7194         .rpc_release = nfs41_sequence_release,
7195 };
7196
7197 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7198                 struct rpc_cred *cred,
7199                 bool is_privileged)
7200 {
7201         struct nfs4_sequence_data *calldata;
7202         struct rpc_message msg = {
7203                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7204                 .rpc_cred = cred,
7205         };
7206         struct rpc_task_setup task_setup_data = {
7207                 .rpc_client = clp->cl_rpcclient,
7208                 .rpc_message = &msg,
7209                 .callback_ops = &nfs41_sequence_ops,
7210                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7211         };
7212
7213         if (!atomic_inc_not_zero(&clp->cl_count))
7214                 return ERR_PTR(-EIO);
7215         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7216         if (calldata == NULL) {
7217                 nfs_put_client(clp);
7218                 return ERR_PTR(-ENOMEM);
7219         }
7220         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7221         if (is_privileged)
7222                 nfs4_set_sequence_privileged(&calldata->args);
7223         msg.rpc_argp = &calldata->args;
7224         msg.rpc_resp = &calldata->res;
7225         calldata->clp = clp;
7226         task_setup_data.callback_data = calldata;
7227
7228         return rpc_run_task(&task_setup_data);
7229 }
7230
7231 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7232 {
7233         struct rpc_task *task;
7234         int ret = 0;
7235
7236         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7237                 return 0;
7238         task = _nfs41_proc_sequence(clp, cred, false);
7239         if (IS_ERR(task))
7240                 ret = PTR_ERR(task);
7241         else
7242                 rpc_put_task_async(task);
7243         dprintk("<-- %s status=%d\n", __func__, ret);
7244         return ret;
7245 }
7246
7247 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7248 {
7249         struct rpc_task *task;
7250         int ret;
7251
7252         task = _nfs41_proc_sequence(clp, cred, true);
7253         if (IS_ERR(task)) {
7254                 ret = PTR_ERR(task);
7255                 goto out;
7256         }
7257         ret = rpc_wait_for_completion_task(task);
7258         if (!ret) {
7259                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7260
7261                 if (task->tk_status == 0)
7262                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7263                 ret = task->tk_status;
7264         }
7265         rpc_put_task(task);
7266 out:
7267         dprintk("<-- %s status=%d\n", __func__, ret);
7268         return ret;
7269 }
7270
7271 struct nfs4_reclaim_complete_data {
7272         struct nfs_client *clp;
7273         struct nfs41_reclaim_complete_args arg;
7274         struct nfs41_reclaim_complete_res res;
7275 };
7276
7277 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7278 {
7279         struct nfs4_reclaim_complete_data *calldata = data;
7280
7281         nfs41_setup_sequence(calldata->clp->cl_session,
7282                         &calldata->arg.seq_args,
7283                         &calldata->res.seq_res,
7284                         task);
7285 }
7286
7287 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7288 {
7289         switch(task->tk_status) {
7290         case 0:
7291         case -NFS4ERR_COMPLETE_ALREADY:
7292         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7293                 break;
7294         case -NFS4ERR_DELAY:
7295                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7296                 /* fall through */
7297         case -NFS4ERR_RETRY_UNCACHED_REP:
7298                 return -EAGAIN;
7299         default:
7300                 nfs4_schedule_lease_recovery(clp);
7301         }
7302         return 0;
7303 }
7304
7305 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7306 {
7307         struct nfs4_reclaim_complete_data *calldata = data;
7308         struct nfs_client *clp = calldata->clp;
7309         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7310
7311         dprintk("--> %s\n", __func__);
7312         if (!nfs41_sequence_done(task, res))
7313                 return;
7314
7315         trace_nfs4_reclaim_complete(clp, task->tk_status);
7316         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7317                 rpc_restart_call_prepare(task);
7318                 return;
7319         }
7320         dprintk("<-- %s\n", __func__);
7321 }
7322
7323 static void nfs4_free_reclaim_complete_data(void *data)
7324 {
7325         struct nfs4_reclaim_complete_data *calldata = data;
7326
7327         kfree(calldata);
7328 }
7329
7330 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7331         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7332         .rpc_call_done = nfs4_reclaim_complete_done,
7333         .rpc_release = nfs4_free_reclaim_complete_data,
7334 };
7335
7336 /*
7337  * Issue a global reclaim complete.
7338  */
7339 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7340                 struct rpc_cred *cred)
7341 {
7342         struct nfs4_reclaim_complete_data *calldata;
7343         struct rpc_task *task;
7344         struct rpc_message msg = {
7345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7346                 .rpc_cred = cred,
7347         };
7348         struct rpc_task_setup task_setup_data = {
7349                 .rpc_client = clp->cl_rpcclient,
7350                 .rpc_message = &msg,
7351                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7352                 .flags = RPC_TASK_ASYNC,
7353         };
7354         int status = -ENOMEM;
7355
7356         dprintk("--> %s\n", __func__);
7357         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7358         if (calldata == NULL)
7359                 goto out;
7360         calldata->clp = clp;
7361         calldata->arg.one_fs = 0;
7362
7363         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7364         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7365         msg.rpc_argp = &calldata->arg;
7366         msg.rpc_resp = &calldata->res;
7367         task_setup_data.callback_data = calldata;
7368         task = rpc_run_task(&task_setup_data);
7369         if (IS_ERR(task)) {
7370                 status = PTR_ERR(task);
7371                 goto out;
7372         }
7373         status = nfs4_wait_for_completion_rpc_task(task);
7374         if (status == 0)
7375                 status = task->tk_status;
7376         rpc_put_task(task);
7377         return 0;
7378 out:
7379         dprintk("<-- %s status=%d\n", __func__, status);
7380         return status;
7381 }
7382
7383 static void
7384 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7385 {
7386         struct nfs4_layoutget *lgp = calldata;
7387         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7388         struct nfs4_session *session = nfs4_get_session(server);
7389
7390         dprintk("--> %s\n", __func__);
7391         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7392          * right now covering the LAYOUTGET we are about to send.
7393          * However, that is not so catastrophic, and there seems
7394          * to be no way to prevent it completely.
7395          */
7396         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7397                                 &lgp->res.seq_res, task))
7398                 return;
7399         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7400                                           NFS_I(lgp->args.inode)->layout,
7401                                           lgp->args.ctx->state)) {
7402                 rpc_exit(task, NFS4_OK);
7403         }
7404 }
7405
7406 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7407 {
7408         struct nfs4_layoutget *lgp = calldata;
7409         struct inode *inode = lgp->args.inode;
7410         struct nfs_server *server = NFS_SERVER(inode);
7411         struct pnfs_layout_hdr *lo;
7412         struct nfs4_state *state = NULL;
7413         unsigned long timeo, giveup;
7414
7415         dprintk("--> %s\n", __func__);
7416
7417         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7418                 goto out;
7419
7420         switch (task->tk_status) {
7421         case 0:
7422                 goto out;
7423         case -NFS4ERR_LAYOUTTRYLATER:
7424         case -NFS4ERR_RECALLCONFLICT:
7425                 timeo = rpc_get_timeout(task->tk_client);
7426                 giveup = lgp->args.timestamp + timeo;
7427                 if (time_after(giveup, jiffies))
7428                         task->tk_status = -NFS4ERR_DELAY;
7429                 break;
7430         case -NFS4ERR_EXPIRED:
7431         case -NFS4ERR_BAD_STATEID:
7432                 spin_lock(&inode->i_lock);
7433                 lo = NFS_I(inode)->layout;
7434                 if (!lo || list_empty(&lo->plh_segs)) {
7435                         spin_unlock(&inode->i_lock);
7436                         /* If the open stateid was bad, then recover it. */
7437                         state = lgp->args.ctx->state;
7438                 } else {
7439                         LIST_HEAD(head);
7440
7441                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7442                         spin_unlock(&inode->i_lock);
7443                         /* Mark the bad layout state as invalid, then
7444                          * retry using the open stateid. */
7445                         pnfs_free_lseg_list(&head);
7446                 }
7447         }
7448         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7449                 rpc_restart_call_prepare(task);
7450 out:
7451         dprintk("<-- %s\n", __func__);
7452 }
7453
7454 static size_t max_response_pages(struct nfs_server *server)
7455 {
7456         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7457         return nfs_page_array_len(0, max_resp_sz);
7458 }
7459
7460 static void nfs4_free_pages(struct page **pages, size_t size)
7461 {
7462         int i;
7463
7464         if (!pages)
7465                 return;
7466
7467         for (i = 0; i < size; i++) {
7468                 if (!pages[i])
7469                         break;
7470                 __free_page(pages[i]);
7471         }
7472         kfree(pages);
7473 }
7474
7475 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7476 {
7477         struct page **pages;
7478         int i;
7479
7480         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7481         if (!pages) {
7482                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7483                 return NULL;
7484         }
7485
7486         for (i = 0; i < size; i++) {
7487                 pages[i] = alloc_page(gfp_flags);
7488                 if (!pages[i]) {
7489                         dprintk("%s: failed to allocate page\n", __func__);
7490                         nfs4_free_pages(pages, size);
7491                         return NULL;
7492                 }
7493         }
7494
7495         return pages;
7496 }
7497
7498 static void nfs4_layoutget_release(void *calldata)
7499 {
7500         struct nfs4_layoutget *lgp = calldata;
7501         struct inode *inode = lgp->args.inode;
7502         struct nfs_server *server = NFS_SERVER(inode);
7503         size_t max_pages = max_response_pages(server);
7504
7505         dprintk("--> %s\n", __func__);
7506         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7507         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7508         put_nfs_open_context(lgp->args.ctx);
7509         kfree(calldata);
7510         dprintk("<-- %s\n", __func__);
7511 }
7512
7513 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7514         .rpc_call_prepare = nfs4_layoutget_prepare,
7515         .rpc_call_done = nfs4_layoutget_done,
7516         .rpc_release = nfs4_layoutget_release,
7517 };
7518
7519 struct pnfs_layout_segment *
7520 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7521 {
7522         struct inode *inode = lgp->args.inode;
7523         struct nfs_server *server = NFS_SERVER(inode);
7524         size_t max_pages = max_response_pages(server);
7525         struct rpc_task *task;
7526         struct rpc_message msg = {
7527                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7528                 .rpc_argp = &lgp->args,
7529                 .rpc_resp = &lgp->res,
7530                 .rpc_cred = lgp->cred,
7531         };
7532         struct rpc_task_setup task_setup_data = {
7533                 .rpc_client = server->client,
7534                 .rpc_message = &msg,
7535                 .callback_ops = &nfs4_layoutget_call_ops,
7536                 .callback_data = lgp,
7537                 .flags = RPC_TASK_ASYNC,
7538         };
7539         struct pnfs_layout_segment *lseg = NULL;
7540         int status = 0;
7541
7542         dprintk("--> %s\n", __func__);
7543
7544         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7545         if (!lgp->args.layout.pages) {
7546                 nfs4_layoutget_release(lgp);
7547                 return ERR_PTR(-ENOMEM);
7548         }
7549         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7550         lgp->args.timestamp = jiffies;
7551
7552         lgp->res.layoutp = &lgp->args.layout;
7553         lgp->res.seq_res.sr_slot = NULL;
7554         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7555
7556         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7557         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7558
7559         task = rpc_run_task(&task_setup_data);
7560         if (IS_ERR(task))
7561                 return ERR_CAST(task);
7562         status = nfs4_wait_for_completion_rpc_task(task);
7563         if (status == 0)
7564                 status = task->tk_status;
7565         trace_nfs4_layoutget(lgp->args.ctx,
7566                         &lgp->args.range,
7567                         &lgp->res.range,
7568                         status);
7569         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7570         if (status == 0 && lgp->res.layoutp->len)
7571                 lseg = pnfs_layout_process(lgp);
7572         rpc_put_task(task);
7573         dprintk("<-- %s status=%d\n", __func__, status);
7574         if (status)
7575                 return ERR_PTR(status);
7576         return lseg;
7577 }
7578
7579 static void
7580 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7581 {
7582         struct nfs4_layoutreturn *lrp = calldata;
7583
7584         dprintk("--> %s\n", __func__);
7585         nfs41_setup_sequence(lrp->clp->cl_session,
7586                         &lrp->args.seq_args,
7587                         &lrp->res.seq_res,
7588                         task);
7589 }
7590
7591 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7592 {
7593         struct nfs4_layoutreturn *lrp = calldata;
7594         struct nfs_server *server;
7595
7596         dprintk("--> %s\n", __func__);
7597
7598         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7599                 return;
7600
7601         server = NFS_SERVER(lrp->args.inode);
7602         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7603                 rpc_restart_call_prepare(task);
7604                 return;
7605         }
7606         dprintk("<-- %s\n", __func__);
7607 }
7608
7609 static void nfs4_layoutreturn_release(void *calldata)
7610 {
7611         struct nfs4_layoutreturn *lrp = calldata;
7612         struct pnfs_layout_hdr *lo = lrp->args.layout;
7613
7614         dprintk("--> %s\n", __func__);
7615         spin_lock(&lo->plh_inode->i_lock);
7616         if (lrp->res.lrs_present)
7617                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7618         lo->plh_block_lgets--;
7619         spin_unlock(&lo->plh_inode->i_lock);
7620         pnfs_put_layout_hdr(lrp->args.layout);
7621         kfree(calldata);
7622         dprintk("<-- %s\n", __func__);
7623 }
7624
7625 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7626         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7627         .rpc_call_done = nfs4_layoutreturn_done,
7628         .rpc_release = nfs4_layoutreturn_release,
7629 };
7630
7631 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7632 {
7633         struct rpc_task *task;
7634         struct rpc_message msg = {
7635                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7636                 .rpc_argp = &lrp->args,
7637                 .rpc_resp = &lrp->res,
7638                 .rpc_cred = lrp->cred,
7639         };
7640         struct rpc_task_setup task_setup_data = {
7641                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7642                 .rpc_message = &msg,
7643                 .callback_ops = &nfs4_layoutreturn_call_ops,
7644                 .callback_data = lrp,
7645         };
7646         int status;
7647
7648         dprintk("--> %s\n", __func__);
7649         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7650         task = rpc_run_task(&task_setup_data);
7651         if (IS_ERR(task))
7652                 return PTR_ERR(task);
7653         status = task->tk_status;
7654         trace_nfs4_layoutreturn(lrp->args.inode, status);
7655         dprintk("<-- %s status=%d\n", __func__, status);
7656         rpc_put_task(task);
7657         return status;
7658 }
7659
7660 /*
7661  * Retrieve the list of Data Server devices from the MDS.
7662  */
7663 static int _nfs4_getdevicelist(struct nfs_server *server,
7664                                     const struct nfs_fh *fh,
7665                                     struct pnfs_devicelist *devlist)
7666 {
7667         struct nfs4_getdevicelist_args args = {
7668                 .fh = fh,
7669                 .layoutclass = server->pnfs_curr_ld->id,
7670         };
7671         struct nfs4_getdevicelist_res res = {
7672                 .devlist = devlist,
7673         };
7674         struct rpc_message msg = {
7675                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7676                 .rpc_argp = &args,
7677                 .rpc_resp = &res,
7678         };
7679         int status;
7680
7681         dprintk("--> %s\n", __func__);
7682         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7683                                 &res.seq_res, 0);
7684         dprintk("<-- %s status=%d\n", __func__, status);
7685         return status;
7686 }
7687
7688 int nfs4_proc_getdevicelist(struct nfs_server *server,
7689                             const struct nfs_fh *fh,
7690                             struct pnfs_devicelist *devlist)
7691 {
7692         struct nfs4_exception exception = { };
7693         int err;
7694
7695         do {
7696                 err = nfs4_handle_exception(server,
7697                                 _nfs4_getdevicelist(server, fh, devlist),
7698                                 &exception);
7699         } while (exception.retry);
7700
7701         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7702                 err, devlist->num_devs);
7703
7704         return err;
7705 }
7706 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7707
7708 static int
7709 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7710                 struct pnfs_device *pdev,
7711                 struct rpc_cred *cred)
7712 {
7713         struct nfs4_getdeviceinfo_args args = {
7714                 .pdev = pdev,
7715         };
7716         struct nfs4_getdeviceinfo_res res = {
7717                 .pdev = pdev,
7718         };
7719         struct rpc_message msg = {
7720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7721                 .rpc_argp = &args,
7722                 .rpc_resp = &res,
7723                 .rpc_cred = cred,
7724         };
7725         int status;
7726
7727         dprintk("--> %s\n", __func__);
7728         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7729         dprintk("<-- %s status=%d\n", __func__, status);
7730
7731         return status;
7732 }
7733
7734 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7735                 struct pnfs_device *pdev,
7736                 struct rpc_cred *cred)
7737 {
7738         struct nfs4_exception exception = { };
7739         int err;
7740
7741         do {
7742                 err = nfs4_handle_exception(server,
7743                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7744                                         &exception);
7745         } while (exception.retry);
7746         return err;
7747 }
7748 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7749
7750 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7751 {
7752         struct nfs4_layoutcommit_data *data = calldata;
7753         struct nfs_server *server = NFS_SERVER(data->args.inode);
7754         struct nfs4_session *session = nfs4_get_session(server);
7755
7756         nfs41_setup_sequence(session,
7757                         &data->args.seq_args,
7758                         &data->res.seq_res,
7759                         task);
7760 }
7761
7762 static void
7763 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7764 {
7765         struct nfs4_layoutcommit_data *data = calldata;
7766         struct nfs_server *server = NFS_SERVER(data->args.inode);
7767
7768         if (!nfs41_sequence_done(task, &data->res.seq_res))
7769                 return;
7770
7771         switch (task->tk_status) { /* Just ignore these failures */
7772         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7773         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7774         case -NFS4ERR_BADLAYOUT:     /* no layout */
7775         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7776                 task->tk_status = 0;
7777                 break;
7778         case 0:
7779                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7780                                                    data->res.fattr);
7781                 break;
7782         default:
7783                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7784                         rpc_restart_call_prepare(task);
7785                         return;
7786                 }
7787         }
7788 }
7789
7790 static void nfs4_layoutcommit_release(void *calldata)
7791 {
7792         struct nfs4_layoutcommit_data *data = calldata;
7793
7794         pnfs_cleanup_layoutcommit(data);
7795         put_rpccred(data->cred);
7796         kfree(data);
7797 }
7798
7799 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7800         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7801         .rpc_call_done = nfs4_layoutcommit_done,
7802         .rpc_release = nfs4_layoutcommit_release,
7803 };
7804
7805 int
7806 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7807 {
7808         struct rpc_message msg = {
7809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7810                 .rpc_argp = &data->args,
7811                 .rpc_resp = &data->res,
7812                 .rpc_cred = data->cred,
7813         };
7814         struct rpc_task_setup task_setup_data = {
7815                 .task = &data->task,
7816                 .rpc_client = NFS_CLIENT(data->args.inode),
7817                 .rpc_message = &msg,
7818                 .callback_ops = &nfs4_layoutcommit_ops,
7819                 .callback_data = data,
7820                 .flags = RPC_TASK_ASYNC,
7821         };
7822         struct rpc_task *task;
7823         int status = 0;
7824
7825         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7826                 "lbw: %llu inode %lu\n",
7827                 data->task.tk_pid, sync,
7828                 data->args.lastbytewritten,
7829                 data->args.inode->i_ino);
7830
7831         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7832         task = rpc_run_task(&task_setup_data);
7833         if (IS_ERR(task))
7834                 return PTR_ERR(task);
7835         if (sync == false)
7836                 goto out;
7837         status = nfs4_wait_for_completion_rpc_task(task);
7838         if (status != 0)
7839                 goto out;
7840         status = task->tk_status;
7841         trace_nfs4_layoutcommit(data->args.inode, status);
7842 out:
7843         dprintk("%s: status %d\n", __func__, status);
7844         rpc_put_task(task);
7845         return status;
7846 }
7847
7848 /**
7849  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7850  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7851  */
7852 static int
7853 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7854                     struct nfs_fsinfo *info,
7855                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7856 {
7857         struct nfs41_secinfo_no_name_args args = {
7858                 .style = SECINFO_STYLE_CURRENT_FH,
7859         };
7860         struct nfs4_secinfo_res res = {
7861                 .flavors = flavors,
7862         };
7863         struct rpc_message msg = {
7864                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7865                 .rpc_argp = &args,
7866                 .rpc_resp = &res,
7867         };
7868         struct rpc_clnt *clnt = server->client;
7869         struct rpc_cred *cred = NULL;
7870         int status;
7871
7872         if (use_integrity) {
7873                 clnt = server->nfs_client->cl_rpcclient;
7874                 cred = nfs4_get_clid_cred(server->nfs_client);
7875                 msg.rpc_cred = cred;
7876         }
7877
7878         dprintk("--> %s\n", __func__);
7879         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7880                                 &res.seq_res, 0);
7881         dprintk("<-- %s status=%d\n", __func__, status);
7882
7883         if (cred)
7884                 put_rpccred(cred);
7885
7886         return status;
7887 }
7888
7889 static int
7890 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7891                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7892 {
7893         struct nfs4_exception exception = { };
7894         int err;
7895         do {
7896                 /* first try using integrity protection */
7897                 err = -NFS4ERR_WRONGSEC;
7898
7899                 /* try to use integrity protection with machine cred */
7900                 if (_nfs4_is_integrity_protected(server->nfs_client))
7901                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7902                                                           flavors, true);
7903
7904                 /*
7905                  * if unable to use integrity protection, or SECINFO with
7906                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7907                  * disallowed by spec, but exists in deployed servers) use
7908                  * the current filesystem's rpc_client and the user cred.
7909                  */
7910                 if (err == -NFS4ERR_WRONGSEC)
7911                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7912                                                           flavors, false);
7913
7914                 switch (err) {
7915                 case 0:
7916                 case -NFS4ERR_WRONGSEC:
7917                 case -NFS4ERR_NOTSUPP:
7918                         goto out;
7919                 default:
7920                         err = nfs4_handle_exception(server, err, &exception);
7921                 }
7922         } while (exception.retry);
7923 out:
7924         return err;
7925 }
7926
7927 static int
7928 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7929                     struct nfs_fsinfo *info)
7930 {
7931         int err;
7932         struct page *page;
7933         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
7934         struct nfs4_secinfo_flavors *flavors;
7935         struct nfs4_secinfo4 *secinfo;
7936         int i;
7937
7938         page = alloc_page(GFP_KERNEL);
7939         if (!page) {
7940                 err = -ENOMEM;
7941                 goto out;
7942         }
7943
7944         flavors = page_address(page);
7945         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7946
7947         /*
7948          * Fall back on "guess and check" method if
7949          * the server doesn't support SECINFO_NO_NAME
7950          */
7951         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7952                 err = nfs4_find_root_sec(server, fhandle, info);
7953                 goto out_freepage;
7954         }
7955         if (err)
7956                 goto out_freepage;
7957
7958         for (i = 0; i < flavors->num_flavors; i++) {
7959                 secinfo = &flavors->flavors[i];
7960
7961                 switch (secinfo->flavor) {
7962                 case RPC_AUTH_NULL:
7963                 case RPC_AUTH_UNIX:
7964                 case RPC_AUTH_GSS:
7965                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
7966                                         &secinfo->flavor_info);
7967                         break;
7968                 default:
7969                         flavor = RPC_AUTH_MAXFLAVOR;
7970                         break;
7971                 }
7972
7973                 if (!nfs_auth_info_match(&server->auth_info, flavor))
7974                         flavor = RPC_AUTH_MAXFLAVOR;
7975
7976                 if (flavor != RPC_AUTH_MAXFLAVOR) {
7977                         err = nfs4_lookup_root_sec(server, fhandle,
7978                                                    info, flavor);
7979                         if (!err)
7980                                 break;
7981                 }
7982         }
7983
7984         if (flavor == RPC_AUTH_MAXFLAVOR)
7985                 err = -EPERM;
7986
7987 out_freepage:
7988         put_page(page);
7989         if (err == -EACCES)
7990                 return -EPERM;
7991 out:
7992         return err;
7993 }
7994
7995 static int _nfs41_test_stateid(struct nfs_server *server,
7996                 nfs4_stateid *stateid,
7997                 struct rpc_cred *cred)
7998 {
7999         int status;
8000         struct nfs41_test_stateid_args args = {
8001                 .stateid = stateid,
8002         };
8003         struct nfs41_test_stateid_res res;
8004         struct rpc_message msg = {
8005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8006                 .rpc_argp = &args,
8007                 .rpc_resp = &res,
8008                 .rpc_cred = cred,
8009         };
8010         struct rpc_clnt *rpc_client = server->client;
8011
8012         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8013                 &rpc_client, &msg);
8014
8015         dprintk("NFS call  test_stateid %p\n", stateid);
8016         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8017         nfs4_set_sequence_privileged(&args.seq_args);
8018         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8019                         &args.seq_args, &res.seq_res);
8020         if (status != NFS_OK) {
8021                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8022                 return status;
8023         }
8024         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8025         return -res.status;
8026 }
8027
8028 /**
8029  * nfs41_test_stateid - perform a TEST_STATEID operation
8030  *
8031  * @server: server / transport on which to perform the operation
8032  * @stateid: state ID to test
8033  * @cred: credential
8034  *
8035  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8036  * Otherwise a negative NFS4ERR value is returned if the operation
8037  * failed or the state ID is not currently valid.
8038  */
8039 static int nfs41_test_stateid(struct nfs_server *server,
8040                 nfs4_stateid *stateid,
8041                 struct rpc_cred *cred)
8042 {
8043         struct nfs4_exception exception = { };
8044         int err;
8045         do {
8046                 err = _nfs41_test_stateid(server, stateid, cred);
8047                 if (err != -NFS4ERR_DELAY)
8048                         break;
8049                 nfs4_handle_exception(server, err, &exception);
8050         } while (exception.retry);
8051         return err;
8052 }
8053
8054 struct nfs_free_stateid_data {
8055         struct nfs_server *server;
8056         struct nfs41_free_stateid_args args;
8057         struct nfs41_free_stateid_res res;
8058 };
8059
8060 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8061 {
8062         struct nfs_free_stateid_data *data = calldata;
8063         nfs41_setup_sequence(nfs4_get_session(data->server),
8064                         &data->args.seq_args,
8065                         &data->res.seq_res,
8066                         task);
8067 }
8068
8069 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8070 {
8071         struct nfs_free_stateid_data *data = calldata;
8072
8073         nfs41_sequence_done(task, &data->res.seq_res);
8074
8075         switch (task->tk_status) {
8076         case -NFS4ERR_DELAY:
8077                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8078                         rpc_restart_call_prepare(task);
8079         }
8080 }
8081
8082 static void nfs41_free_stateid_release(void *calldata)
8083 {
8084         kfree(calldata);
8085 }
8086
8087 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8088         .rpc_call_prepare = nfs41_free_stateid_prepare,
8089         .rpc_call_done = nfs41_free_stateid_done,
8090         .rpc_release = nfs41_free_stateid_release,
8091 };
8092
8093 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8094                 nfs4_stateid *stateid,
8095                 struct rpc_cred *cred,
8096                 bool privileged)
8097 {
8098         struct rpc_message msg = {
8099                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8100                 .rpc_cred = cred,
8101         };
8102         struct rpc_task_setup task_setup = {
8103                 .rpc_client = server->client,
8104                 .rpc_message = &msg,
8105                 .callback_ops = &nfs41_free_stateid_ops,
8106                 .flags = RPC_TASK_ASYNC,
8107         };
8108         struct nfs_free_stateid_data *data;
8109
8110         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8111                 &task_setup.rpc_client, &msg);
8112
8113         dprintk("NFS call  free_stateid %p\n", stateid);
8114         data = kmalloc(sizeof(*data), GFP_NOFS);
8115         if (!data)
8116                 return ERR_PTR(-ENOMEM);
8117         data->server = server;
8118         nfs4_stateid_copy(&data->args.stateid, stateid);
8119
8120         task_setup.callback_data = data;
8121
8122         msg.rpc_argp = &data->args;
8123         msg.rpc_resp = &data->res;
8124         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8125         if (privileged)
8126                 nfs4_set_sequence_privileged(&data->args.seq_args);
8127
8128         return rpc_run_task(&task_setup);
8129 }
8130
8131 /**
8132  * nfs41_free_stateid - perform a FREE_STATEID operation
8133  *
8134  * @server: server / transport on which to perform the operation
8135  * @stateid: state ID to release
8136  * @cred: credential
8137  *
8138  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8139  * negative NFS4ERR value is returned.
8140  */
8141 static int nfs41_free_stateid(struct nfs_server *server,
8142                 nfs4_stateid *stateid,
8143                 struct rpc_cred *cred)
8144 {
8145         struct rpc_task *task;
8146         int ret;
8147
8148         task = _nfs41_free_stateid(server, stateid, cred, true);
8149         if (IS_ERR(task))
8150                 return PTR_ERR(task);
8151         ret = rpc_wait_for_completion_task(task);
8152         if (!ret)
8153                 ret = task->tk_status;
8154         rpc_put_task(task);
8155         return ret;
8156 }
8157
8158 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8159 {
8160         struct rpc_task *task;
8161         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8162
8163         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8164         nfs4_free_lock_state(server, lsp);
8165         if (IS_ERR(task))
8166                 return PTR_ERR(task);
8167         rpc_put_task(task);
8168         return 0;
8169 }
8170
8171 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8172                 const nfs4_stateid *s2)
8173 {
8174         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8175                 return false;
8176
8177         if (s1->seqid == s2->seqid)
8178                 return true;
8179         if (s1->seqid == 0 || s2->seqid == 0)
8180                 return true;
8181
8182         return false;
8183 }
8184
8185 #endif /* CONFIG_NFS_V4_1 */
8186
8187 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8188                 const nfs4_stateid *s2)
8189 {
8190         return nfs4_stateid_match(s1, s2);
8191 }
8192
8193
8194 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8195         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8196         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8197         .recover_open   = nfs4_open_reclaim,
8198         .recover_lock   = nfs4_lock_reclaim,
8199         .establish_clid = nfs4_init_clientid,
8200         .detect_trunking = nfs40_discover_server_trunking,
8201 };
8202
8203 #if defined(CONFIG_NFS_V4_1)
8204 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8205         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8206         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8207         .recover_open   = nfs4_open_reclaim,
8208         .recover_lock   = nfs4_lock_reclaim,
8209         .establish_clid = nfs41_init_clientid,
8210         .reclaim_complete = nfs41_proc_reclaim_complete,
8211         .detect_trunking = nfs41_discover_server_trunking,
8212 };
8213 #endif /* CONFIG_NFS_V4_1 */
8214
8215 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8216         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8217         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8218         .recover_open   = nfs4_open_expired,
8219         .recover_lock   = nfs4_lock_expired,
8220         .establish_clid = nfs4_init_clientid,
8221 };
8222
8223 #if defined(CONFIG_NFS_V4_1)
8224 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8225         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8226         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8227         .recover_open   = nfs41_open_expired,
8228         .recover_lock   = nfs41_lock_expired,
8229         .establish_clid = nfs41_init_clientid,
8230 };
8231 #endif /* CONFIG_NFS_V4_1 */
8232
8233 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8234         .sched_state_renewal = nfs4_proc_async_renew,
8235         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8236         .renew_lease = nfs4_proc_renew,
8237 };
8238
8239 #if defined(CONFIG_NFS_V4_1)
8240 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8241         .sched_state_renewal = nfs41_proc_async_sequence,
8242         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8243         .renew_lease = nfs4_proc_sequence,
8244 };
8245 #endif
8246
8247 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8248         .get_locations = _nfs40_proc_get_locations,
8249         .fsid_present = _nfs40_proc_fsid_present,
8250 };
8251
8252 #if defined(CONFIG_NFS_V4_1)
8253 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8254         .get_locations = _nfs41_proc_get_locations,
8255         .fsid_present = _nfs41_proc_fsid_present,
8256 };
8257 #endif  /* CONFIG_NFS_V4_1 */
8258
8259 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8260         .minor_version = 0,
8261         .init_caps = NFS_CAP_READDIRPLUS
8262                 | NFS_CAP_ATOMIC_OPEN
8263                 | NFS_CAP_CHANGE_ATTR
8264                 | NFS_CAP_POSIX_LOCK,
8265         .init_client = nfs40_init_client,
8266         .shutdown_client = nfs40_shutdown_client,
8267         .match_stateid = nfs4_match_stateid,
8268         .find_root_sec = nfs4_find_root_sec,
8269         .free_lock_state = nfs4_release_lockowner,
8270         .call_sync_ops = &nfs40_call_sync_ops,
8271         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8272         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8273         .state_renewal_ops = &nfs40_state_renewal_ops,
8274         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8275 };
8276
8277 #if defined(CONFIG_NFS_V4_1)
8278 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8279         .minor_version = 1,
8280         .init_caps = NFS_CAP_READDIRPLUS
8281                 | NFS_CAP_ATOMIC_OPEN
8282                 | NFS_CAP_CHANGE_ATTR
8283                 | NFS_CAP_POSIX_LOCK
8284                 | NFS_CAP_STATEID_NFSV41
8285                 | NFS_CAP_ATOMIC_OPEN_V1,
8286         .init_client = nfs41_init_client,
8287         .shutdown_client = nfs41_shutdown_client,
8288         .match_stateid = nfs41_match_stateid,
8289         .find_root_sec = nfs41_find_root_sec,
8290         .free_lock_state = nfs41_free_lock_state,
8291         .call_sync_ops = &nfs41_call_sync_ops,
8292         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8293         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8294         .state_renewal_ops = &nfs41_state_renewal_ops,
8295         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8296 };
8297 #endif
8298
8299 #if defined(CONFIG_NFS_V4_2)
8300 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8301         .minor_version = 2,
8302         .init_caps = NFS_CAP_READDIRPLUS
8303                 | NFS_CAP_ATOMIC_OPEN
8304                 | NFS_CAP_CHANGE_ATTR
8305                 | NFS_CAP_POSIX_LOCK
8306                 | NFS_CAP_STATEID_NFSV41
8307                 | NFS_CAP_ATOMIC_OPEN_V1,
8308         .init_client = nfs41_init_client,
8309         .shutdown_client = nfs41_shutdown_client,
8310         .match_stateid = nfs41_match_stateid,
8311         .find_root_sec = nfs41_find_root_sec,
8312         .free_lock_state = nfs41_free_lock_state,
8313         .call_sync_ops = &nfs41_call_sync_ops,
8314         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8315         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8316         .state_renewal_ops = &nfs41_state_renewal_ops,
8317 };
8318 #endif
8319
8320 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8321         [0] = &nfs_v4_0_minor_ops,
8322 #if defined(CONFIG_NFS_V4_1)
8323         [1] = &nfs_v4_1_minor_ops,
8324 #endif
8325 #if defined(CONFIG_NFS_V4_2)
8326         [2] = &nfs_v4_2_minor_ops,
8327 #endif
8328 };
8329
8330 static const struct inode_operations nfs4_dir_inode_operations = {
8331         .create         = nfs_create,
8332         .lookup         = nfs_lookup,
8333         .atomic_open    = nfs_atomic_open,
8334         .link           = nfs_link,
8335         .unlink         = nfs_unlink,
8336         .symlink        = nfs_symlink,
8337         .mkdir          = nfs_mkdir,
8338         .rmdir          = nfs_rmdir,
8339         .mknod          = nfs_mknod,
8340         .rename         = nfs_rename,
8341         .permission     = nfs_permission,
8342         .getattr        = nfs_getattr,
8343         .setattr        = nfs_setattr,
8344         .getxattr       = generic_getxattr,
8345         .setxattr       = generic_setxattr,
8346         .listxattr      = generic_listxattr,
8347         .removexattr    = generic_removexattr,
8348 };
8349
8350 static const struct inode_operations nfs4_file_inode_operations = {
8351         .permission     = nfs_permission,
8352         .getattr        = nfs_getattr,
8353         .setattr        = nfs_setattr,
8354         .getxattr       = generic_getxattr,
8355         .setxattr       = generic_setxattr,
8356         .listxattr      = generic_listxattr,
8357         .removexattr    = generic_removexattr,
8358 };
8359
8360 const struct nfs_rpc_ops nfs_v4_clientops = {
8361         .version        = 4,                    /* protocol version */
8362         .dentry_ops     = &nfs4_dentry_operations,
8363         .dir_inode_ops  = &nfs4_dir_inode_operations,
8364         .file_inode_ops = &nfs4_file_inode_operations,
8365         .file_ops       = &nfs4_file_operations,
8366         .getroot        = nfs4_proc_get_root,
8367         .submount       = nfs4_submount,
8368         .try_mount      = nfs4_try_mount,
8369         .getattr        = nfs4_proc_getattr,
8370         .setattr        = nfs4_proc_setattr,
8371         .lookup         = nfs4_proc_lookup,
8372         .access         = nfs4_proc_access,
8373         .readlink       = nfs4_proc_readlink,
8374         .create         = nfs4_proc_create,
8375         .remove         = nfs4_proc_remove,
8376         .unlink_setup   = nfs4_proc_unlink_setup,
8377         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8378         .unlink_done    = nfs4_proc_unlink_done,
8379         .rename         = nfs4_proc_rename,
8380         .rename_setup   = nfs4_proc_rename_setup,
8381         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8382         .rename_done    = nfs4_proc_rename_done,
8383         .link           = nfs4_proc_link,
8384         .symlink        = nfs4_proc_symlink,
8385         .mkdir          = nfs4_proc_mkdir,
8386         .rmdir          = nfs4_proc_remove,
8387         .readdir        = nfs4_proc_readdir,
8388         .mknod          = nfs4_proc_mknod,
8389         .statfs         = nfs4_proc_statfs,
8390         .fsinfo         = nfs4_proc_fsinfo,
8391         .pathconf       = nfs4_proc_pathconf,
8392         .set_capabilities = nfs4_server_capabilities,
8393         .decode_dirent  = nfs4_decode_dirent,
8394         .read_setup     = nfs4_proc_read_setup,
8395         .read_pageio_init = pnfs_pageio_init_read,
8396         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8397         .read_done      = nfs4_read_done,
8398         .write_setup    = nfs4_proc_write_setup,
8399         .write_pageio_init = pnfs_pageio_init_write,
8400         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8401         .write_done     = nfs4_write_done,
8402         .commit_setup   = nfs4_proc_commit_setup,
8403         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8404         .commit_done    = nfs4_commit_done,
8405         .lock           = nfs4_proc_lock,
8406         .clear_acl_cache = nfs4_zap_acl_attr,
8407         .close_context  = nfs4_close_context,
8408         .open_context   = nfs4_atomic_open,
8409         .have_delegation = nfs4_have_delegation,
8410         .return_delegation = nfs4_inode_return_delegation,
8411         .alloc_client   = nfs4_alloc_client,
8412         .init_client    = nfs4_init_client,
8413         .free_client    = nfs4_free_client,
8414         .create_server  = nfs4_create_server,
8415         .clone_server   = nfs_clone_server,
8416 };
8417
8418 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8419         .prefix = XATTR_NAME_NFSV4_ACL,
8420         .list   = nfs4_xattr_list_nfs4_acl,
8421         .get    = nfs4_xattr_get_nfs4_acl,
8422         .set    = nfs4_xattr_set_nfs4_acl,
8423 };
8424
8425 const struct xattr_handler *nfs4_xattr_handlers[] = {
8426         &nfs4_xattr_nfs4_acl_handler,
8427 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8428         &nfs4_xattr_nfs4_label_handler,
8429 #endif
8430         NULL
8431 };
8432
8433 /*
8434  * Local variables:
8435  *  c-basic-offset: 8
8436  * End:
8437  */