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 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96         case -NFS4ERR_LAYOUTTRYLATER:
  97         case -NFS4ERR_RECALLCONFLICT:
  98                 return -EREMOTEIO;
  99         case -NFS4ERR_WRONGSEC:
 100                 return -EPERM;
 101         case -NFS4ERR_BADOWNER:
 102         case -NFS4ERR_BADNAME:
 103                 return -EINVAL;
 104         case -NFS4ERR_SHARE_DENIED:
 105                 return -EACCES;
 106         case -NFS4ERR_MINOR_VERS_MISMATCH:
 107                 return -EPROTONOSUPPORT;
 108         case -NFS4ERR_ACCESS:
 109                 return -EACCES;
 110         default:
 111                 dprintk("%s could not handle NFSv4 error %d\n",
 112                                 __func__, -err);
 113                 break;
 114         }
 115         return -EIO;
 116 }
 117
 118 /*
 119  * This is our standard bitmap for GETATTR requests.
 120  */
 121 const u32 nfs4_fattr_bitmap[3] = {
 122         FATTR4_WORD0_TYPE
 123         | FATTR4_WORD0_CHANGE
 124         | FATTR4_WORD0_SIZE
 125         | FATTR4_WORD0_FSID
 126         | FATTR4_WORD0_FILEID,
 127         FATTR4_WORD1_MODE
 128         | FATTR4_WORD1_NUMLINKS
 129         | FATTR4_WORD1_OWNER
 130         | FATTR4_WORD1_OWNER_GROUP
 131         | FATTR4_WORD1_RAWDEV
 132         | FATTR4_WORD1_SPACE_USED
 133         | FATTR4_WORD1_TIME_ACCESS
 134         | FATTR4_WORD1_TIME_METADATA
 135         | FATTR4_WORD1_TIME_MODIFY
 136 };
 137
 138 static const u32 nfs4_pnfs_open_bitmap[3] = {
 139         FATTR4_WORD0_TYPE
 140         | FATTR4_WORD0_CHANGE
 141         | FATTR4_WORD0_SIZE
 142         | FATTR4_WORD0_FSID
 143         | FATTR4_WORD0_FILEID,
 144         FATTR4_WORD1_MODE
 145         | FATTR4_WORD1_NUMLINKS
 146         | FATTR4_WORD1_OWNER
 147         | FATTR4_WORD1_OWNER_GROUP
 148         | FATTR4_WORD1_RAWDEV
 149         | FATTR4_WORD1_SPACE_USED
 150         | FATTR4_WORD1_TIME_ACCESS
 151         | FATTR4_WORD1_TIME_METADATA
 152         | FATTR4_WORD1_TIME_MODIFY,
 153         FATTR4_WORD2_MDSTHRESHOLD
 154 };
 155
 156 static const u32 nfs4_open_noattr_bitmap[3] = {
 157         FATTR4_WORD0_TYPE
 158         | FATTR4_WORD0_CHANGE
 159         | FATTR4_WORD0_FILEID,
 160 };
 161
 162 const u32 nfs4_statfs_bitmap[2] = {
 163         FATTR4_WORD0_FILES_AVAIL
 164         | FATTR4_WORD0_FILES_FREE
 165         | FATTR4_WORD0_FILES_TOTAL,
 166         FATTR4_WORD1_SPACE_AVAIL
 167         | FATTR4_WORD1_SPACE_FREE
 168         | FATTR4_WORD1_SPACE_TOTAL
 169 };
 170
 171 const u32 nfs4_pathconf_bitmap[2] = {
 172         FATTR4_WORD0_MAXLINK
 173         | FATTR4_WORD0_MAXNAME,
 174         0
 175 };
 176
 177 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 178                         | FATTR4_WORD0_MAXREAD
 179                         | FATTR4_WORD0_MAXWRITE
 180                         | FATTR4_WORD0_LEASE_TIME,
 181                         FATTR4_WORD1_TIME_DELTA
 182                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 183                         FATTR4_WORD2_LAYOUT_BLKSIZE
 184 };
 185
 186 const u32 nfs4_fs_locations_bitmap[2] = {
 187         FATTR4_WORD0_TYPE
 188         | FATTR4_WORD0_CHANGE
 189         | FATTR4_WORD0_SIZE
 190         | FATTR4_WORD0_FSID
 191         | FATTR4_WORD0_FILEID
 192         | FATTR4_WORD0_FS_LOCATIONS,
 193         FATTR4_WORD1_MODE
 194         | FATTR4_WORD1_NUMLINKS
 195         | FATTR4_WORD1_OWNER
 196         | FATTR4_WORD1_OWNER_GROUP
 197         | FATTR4_WORD1_RAWDEV
 198         | FATTR4_WORD1_SPACE_USED
 199         | FATTR4_WORD1_TIME_ACCESS
 200         | FATTR4_WORD1_TIME_METADATA
 201         | FATTR4_WORD1_TIME_MODIFY
 202         | FATTR4_WORD1_MOUNTED_ON_FILEID
 203 };
 204
 205 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 206                 struct nfs4_readdir_arg *readdir)
 207 {
 208         __be32 *start, *p;
 209
 210         if (cookie > 2) {
 211                 readdir->cookie = cookie;
 212                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 213                 return;
 214         }
 215
 216         readdir->cookie = 0;
 217         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 218         if (cookie == 2)
 219                 return;
 220
 221         /*
 222          * NFSv4 servers do not return entries for '.' and '..'
 223          * Therefore, we fake these entries here.  We let '.'
 224          * have cookie 0 and '..' have cookie 1.  Note that
 225          * when talking to the server, we always send cookie 0
 226          * instead of 1 or 2.
 227          */
 228         start = p = kmap_atomic(*readdir->pages);
 229
 230         if (cookie == 0) {
 231                 *p++ = xdr_one;                                  /* next */
 232                 *p++ = xdr_zero;                   /* cookie, first word */
 233                 *p++ = xdr_one;                   /* cookie, second word */
 234                 *p++ = xdr_one;                             /* entry len */
 235                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 236                 p++;
 237                 *p++ = xdr_one;                         /* bitmap length */
 238                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 239                 *p++ = htonl(8);              /* attribute buffer length */
 240                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 241         }
 242
 243         *p++ = xdr_one;                                  /* next */
 244         *p++ = xdr_zero;                   /* cookie, first word */
 245         *p++ = xdr_two;                   /* cookie, second word */
 246         *p++ = xdr_two;                             /* entry len */
 247         memcpy(p, "..\0\0", 4);                         /* entry */
 248         p++;
 249         *p++ = xdr_one;                         /* bitmap length */
 250         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 251         *p++ = htonl(8);              /* attribute buffer length */
 252         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 253
 254         readdir->pgbase = (char *)p - (char *)start;
 255         readdir->count -= readdir->pgbase;
 256         kunmap_atomic(start);
 257 }
 258
 259 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 260 {
 261         int res = 0;
 262
 263         might_sleep();
 264
 265         if (*timeout <= 0)
 266                 *timeout = NFS4_POLL_RETRY_MIN;
 267         if (*timeout > NFS4_POLL_RETRY_MAX)
 268                 *timeout = NFS4_POLL_RETRY_MAX;
 269         freezable_schedule_timeout_killable(*timeout);
 270         if (fatal_signal_pending(current))
 271                 res = -ERESTARTSYS;
 272         *timeout <<= 1;
 273         return res;
 274 }
 275
 276 /* This is the error handling routine for processes that are allowed
 277  * to sleep.
 278  */
 279 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 280 {
 281         struct nfs_client *clp = server->nfs_client;
 282         struct nfs4_state *state = exception->state;
 283         struct inode *inode = exception->inode;
 284         int ret = errorcode;
 285
 286         exception->retry = 0;
 287         switch(errorcode) {
 288                 case 0:
 289                         return 0;
 290                 case -NFS4ERR_OPENMODE:
 291                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 292                                 nfs4_inode_return_delegation(inode);
 293                                 exception->retry = 1;
 294                                 return 0;
 295                         }
 296                         if (state == NULL)
 297                                 break;
 298                         nfs4_schedule_stateid_recovery(server, state);
 299                         goto wait_on_recovery;
 300                 case -NFS4ERR_DELEG_REVOKED:
 301                 case -NFS4ERR_ADMIN_REVOKED:
 302                 case -NFS4ERR_BAD_STATEID:
 303                         if (state == NULL)
 304                                 break;
 305                         nfs_remove_bad_delegation(state->inode);
 306                         nfs4_schedule_stateid_recovery(server, state);
 307                         goto wait_on_recovery;
 308                 case -NFS4ERR_EXPIRED:
 309                         if (state != NULL)
 310                                 nfs4_schedule_stateid_recovery(server, state);
 311                 case -NFS4ERR_STALE_STATEID:
 312                 case -NFS4ERR_STALE_CLIENTID:
 313                         nfs4_schedule_lease_recovery(clp);
 314                         goto wait_on_recovery;
 315 #if defined(CONFIG_NFS_V4_1)
 316                 case -NFS4ERR_BADSESSION:
 317                 case -NFS4ERR_BADSLOT:
 318                 case -NFS4ERR_BAD_HIGH_SLOT:
 319                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 320                 case -NFS4ERR_DEADSESSION:
 321                 case -NFS4ERR_SEQ_FALSE_RETRY:
 322                 case -NFS4ERR_SEQ_MISORDERED:
 323                         dprintk("%s ERROR: %d Reset session\n", __func__,
 324                                 errorcode);
 325                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 326                         goto wait_on_recovery;
 327 #endif /* defined(CONFIG_NFS_V4_1) */
 328                 case -NFS4ERR_FILE_OPEN:
 329                         if (exception->timeout > HZ) {
 330                                 /* We have retried a decent amount, time to
 331                                  * fail
 332                                  */
 333                                 ret = -EBUSY;
 334                                 break;
 335                         }
 336                 case -NFS4ERR_GRACE:
 337                 case -NFS4ERR_DELAY:
 338                         ret = nfs4_delay(server->client, &exception->timeout);
 339                         if (ret != 0)
 340                                 break;
 341                 case -NFS4ERR_RETRY_UNCACHED_REP:
 342                 case -NFS4ERR_OLD_STATEID:
 343                         exception->retry = 1;
 344                         break;
 345                 case -NFS4ERR_BADOWNER:
 346                         /* The following works around a Linux server bug! */
 347                 case -NFS4ERR_BADNAME:
 348                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 349                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 350                                 exception->retry = 1;
 351                                 printk(KERN_WARNING "NFS: v4 server %s "
 352                                                 "does not accept raw "
 353                                                 "uid/gids. "
 354                                                 "Reenabling the idmapper.\n",
 355                                                 server->nfs_client->cl_hostname);
 356                         }
 357         }
 358         /* We failed to handle the error */
 359         return nfs4_map_errors(ret);
 360 wait_on_recovery:
 361         ret = nfs4_wait_clnt_recover(clp);
 362         if (ret == 0)
 363                 exception->retry = 1;
 364         return ret;
 365 }
 366
 367
 368 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 369 {
 370         spin_lock(&clp->cl_lock);
 371         if (time_before(clp->cl_last_renewal,timestamp))
 372                 clp->cl_last_renewal = timestamp;
 373         spin_unlock(&clp->cl_lock);
 374 }
 375
 376 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 377 {
 378         do_renew_lease(server->nfs_client, timestamp);
 379 }
 380
 381 #if defined(CONFIG_NFS_V4_1)
 382
 383 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 384 {
 385         struct nfs4_session *session;
 386         struct nfs4_slot_table *tbl;
 387         bool send_new_highest_used_slotid = false;
 388
 389         if (!res->sr_slot) {
 390                 /* just wake up the next guy waiting since
 391                  * we may have not consumed a slot after all */
 392                 dprintk("%s: No slot\n", __func__);
 393                 return;
 394         }
 395         tbl = res->sr_slot->table;
 396         session = tbl->session;
 397
 398         spin_lock(&tbl->slot_tbl_lock);
 399         /* Be nice to the server: try to ensure that the last transmitted
 400          * value for highest_user_slotid <= target_highest_slotid
 401          */
 402         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 403                 send_new_highest_used_slotid = true;
 404
 405         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 406                 send_new_highest_used_slotid = false;
 407                 goto out_unlock;
 408         }
 409         nfs4_free_slot(tbl, res->sr_slot);
 410
 411         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 412                 send_new_highest_used_slotid = false;
 413 out_unlock:
 414         spin_unlock(&tbl->slot_tbl_lock);
 415         res->sr_slot = NULL;
 416         if (send_new_highest_used_slotid)
 417                 nfs41_server_notify_highest_slotid_update(session->clp);
 418 }
 419
 420 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 421 {
 422         struct nfs4_session *session;
 423         struct nfs4_slot *slot;
 424         struct nfs_client *clp;
 425         bool interrupted = false;
 426         int ret = 1;
 427
 428         /* don't increment the sequence number if the task wasn't sent */
 429         if (!RPC_WAS_SENT(task))
 430                 goto out;
 431
 432         slot = res->sr_slot;
 433         session = slot->table->session;
 434
 435         if (slot->interrupted) {
 436                 slot->interrupted = 0;
 437                 interrupted = true;
 438         }
 439
 440         /* Check the SEQUENCE operation status */
 441         switch (res->sr_status) {
 442         case 0:
 443                 /* Update the slot's sequence and clientid lease timer */
 444                 ++slot->seq_nr;
 445                 clp = session->clp;
 446                 do_renew_lease(clp, res->sr_timestamp);
 447                 /* Check sequence flags */
 448                 if (res->sr_status_flags != 0)
 449                         nfs4_schedule_lease_recovery(clp);
 450                 nfs41_update_target_slotid(slot->table, slot, res);
 451                 break;
 452         case 1:
 453                 /*
 454                  * sr_status remains 1 if an RPC level error occurred.
 455                  * The server may or may not have processed the sequence
 456                  * operation..
 457                  * Mark the slot as having hosted an interrupted RPC call.
 458                  */
 459                 slot->interrupted = 1;
 460                 goto out;
 461         case -NFS4ERR_DELAY:
 462                 /* The server detected a resend of the RPC call and
 463                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 464                  * of RFC5661.
 465                  */
 466                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 467                         __func__,
 468                         slot->slot_nr,
 469                         slot->seq_nr);
 470                 goto out_retry;
 471         case -NFS4ERR_BADSLOT:
 472                 /*
 473                  * The slot id we used was probably retired. Try again
 474                  * using a different slot id.
 475                  */
 476                 goto retry_nowait;
 477         case -NFS4ERR_SEQ_MISORDERED:
 478                 /*
 479                  * Was the last operation on this sequence interrupted?
 480                  * If so, retry after bumping the sequence number.
 481                  */
 482                 if (interrupted) {
 483                         ++slot->seq_nr;
 484                         goto retry_nowait;
 485                 }
 486                 /*
 487                  * Could this slot have been previously retired?
 488                  * If so, then the server may be expecting seq_nr = 1!
 489                  */
 490                 if (slot->seq_nr != 1) {
 491                         slot->seq_nr = 1;
 492                         goto retry_nowait;
 493                 }
 494                 break;
 495         case -NFS4ERR_SEQ_FALSE_RETRY:
 496                 ++slot->seq_nr;
 497                 goto retry_nowait;
 498         default:
 499                 /* Just update the slot sequence no. */
 500                 ++slot->seq_nr;
 501         }
 502 out:
 503         /* The session may be reset by one of the error handlers. */
 504         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 505         nfs41_sequence_free_slot(res);
 506         return ret;
 507 retry_nowait:
 508         if (rpc_restart_call_prepare(task)) {
 509                 task->tk_status = 0;
 510                 ret = 0;
 511         }
 512         goto out;
 513 out_retry:
 514         if (!rpc_restart_call(task))
 515                 goto out;
 516         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 517         return 0;
 518 }
 519
 520 static int nfs4_sequence_done(struct rpc_task *task,
 521                                struct nfs4_sequence_res *res)
 522 {
 523         if (res->sr_slot == NULL)
 524                 return 1;
 525         return nfs41_sequence_done(task, res);
 526 }
 527
 528 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 529                 struct nfs4_sequence_res *res, int cache_reply)
 530 {
 531         args->sa_slot = NULL;
 532         args->sa_cache_this = 0;
 533         args->sa_privileged = 0;
 534         if (cache_reply)
 535                 args->sa_cache_this = 1;
 536         res->sr_slot = NULL;
 537 }
 538
 539 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 540 {
 541         args->sa_privileged = 1;
 542 }
 543
 544 int nfs41_setup_sequence(struct nfs4_session *session,
 545                                 struct nfs4_sequence_args *args,
 546                                 struct nfs4_sequence_res *res,
 547                                 struct rpc_task *task)
 548 {
 549         struct nfs4_slot *slot;
 550         struct nfs4_slot_table *tbl;
 551
 552         dprintk("--> %s\n", __func__);
 553         /* slot already allocated? */
 554         if (res->sr_slot != NULL)
 555                 goto out_success;
 556
 557         tbl = &session->fc_slot_table;
 558
 559         task->tk_timeout = 0;
 560
 561         spin_lock(&tbl->slot_tbl_lock);
 562         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 563             !args->sa_privileged) {
 564                 /* The state manager will wait until the slot table is empty */
 565                 dprintk("%s session is draining\n", __func__);
 566                 goto out_sleep;
 567         }
 568
 569         slot = nfs4_alloc_slot(tbl);
 570         if (IS_ERR(slot)) {
 571                 /* If out of memory, try again in 1/4 second */
 572                 if (slot == ERR_PTR(-ENOMEM))
 573                         task->tk_timeout = HZ >> 2;
 574                 dprintk("<-- %s: no free slots\n", __func__);
 575                 goto out_sleep;
 576         }
 577         spin_unlock(&tbl->slot_tbl_lock);
 578
 579         args->sa_slot = slot;
 580
 581         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 582                         slot->slot_nr, slot->seq_nr);
 583
 584         res->sr_slot = slot;
 585         res->sr_timestamp = jiffies;
 586         res->sr_status_flags = 0;
 587         /*
 588          * sr_status is only set in decode_sequence, and so will remain
 589          * set to 1 if an rpc level failure occurs.
 590          */
 591         res->sr_status = 1;
 592 out_success:
 593         rpc_call_start(task);
 594         return 0;
 595 out_sleep:
 596         /* Privileged tasks are queued with top priority */
 597         if (args->sa_privileged)
 598                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 599                                 NULL, RPC_PRIORITY_PRIVILEGED);
 600         else
 601                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 602         spin_unlock(&tbl->slot_tbl_lock);
 603         return -EAGAIN;
 604 }
 605 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 606
 607 int nfs4_setup_sequence(const struct nfs_server *server,
 608                         struct nfs4_sequence_args *args,
 609                         struct nfs4_sequence_res *res,
 610                         struct rpc_task *task)
 611 {
 612         struct nfs4_session *session = nfs4_get_session(server);
 613         int ret = 0;
 614
 615         if (session == NULL) {
 616                 rpc_call_start(task);
 617                 goto out;
 618         }
 619
 620         dprintk("--> %s clp %p session %p sr_slot %d\n",
 621                 __func__, session->clp, session, res->sr_slot ?
 622                         res->sr_slot->slot_nr : -1);
 623
 624         ret = nfs41_setup_sequence(session, args, res, task);
 625 out:
 626         dprintk("<-- %s status=%d\n", __func__, ret);
 627         return ret;
 628 }
 629
 630 struct nfs41_call_sync_data {
 631         const struct nfs_server *seq_server;
 632         struct nfs4_sequence_args *seq_args;
 633         struct nfs4_sequence_res *seq_res;
 634 };
 635
 636 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 637 {
 638         struct nfs41_call_sync_data *data = calldata;
 639         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 640
 641         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 642
 643         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 644 }
 645
 646 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 647 {
 648         struct nfs41_call_sync_data *data = calldata;
 649
 650         nfs41_sequence_done(task, data->seq_res);
 651 }
 652
 653 static const struct rpc_call_ops nfs41_call_sync_ops = {
 654         .rpc_call_prepare = nfs41_call_sync_prepare,
 655         .rpc_call_done = nfs41_call_sync_done,
 656 };
 657
 658 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 659                                    struct nfs_server *server,
 660                                    struct rpc_message *msg,
 661                                    struct nfs4_sequence_args *args,
 662                                    struct nfs4_sequence_res *res)
 663 {
 664         int ret;
 665         struct rpc_task *task;
 666         struct nfs41_call_sync_data data = {
 667                 .seq_server = server,
 668                 .seq_args = args,
 669                 .seq_res = res,
 670         };
 671         struct rpc_task_setup task_setup = {
 672                 .rpc_client = clnt,
 673                 .rpc_message = msg,
 674                 .callback_ops = &nfs41_call_sync_ops,
 675                 .callback_data = &data
 676         };
 677
 678         task = rpc_run_task(&task_setup);
 679         if (IS_ERR(task))
 680                 ret = PTR_ERR(task);
 681         else {
 682                 ret = task->tk_status;
 683                 rpc_put_task(task);
 684         }
 685         return ret;
 686 }
 687
 688 #else
 689 static
 690 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 691                 struct nfs4_sequence_res *res, int cache_reply)
 692 {
 693 }
 694
 695 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 696 {
 697 }
 698
 699
 700 static int nfs4_sequence_done(struct rpc_task *task,
 701                                struct nfs4_sequence_res *res)
 702 {
 703         return 1;
 704 }
 705 #endif /* CONFIG_NFS_V4_1 */
 706
 707 static
 708 int _nfs4_call_sync(struct rpc_clnt *clnt,
 709                     struct nfs_server *server,
 710                     struct rpc_message *msg,
 711                     struct nfs4_sequence_args *args,
 712                     struct nfs4_sequence_res *res)
 713 {
 714         return rpc_call_sync(clnt, msg, 0);
 715 }
 716
 717 static
 718 int nfs4_call_sync(struct rpc_clnt *clnt,
 719                    struct nfs_server *server,
 720                    struct rpc_message *msg,
 721                    struct nfs4_sequence_args *args,
 722                    struct nfs4_sequence_res *res,
 723                    int cache_reply)
 724 {
 725         nfs41_init_sequence(args, res, cache_reply);
 726         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 727                                                 args, res);
 728 }
 729
 730 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 731 {
 732         struct nfs_inode *nfsi = NFS_I(dir);
 733
 734         spin_lock(&dir->i_lock);
 735         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 736         if (!cinfo->atomic || cinfo->before != dir->i_version)
 737                 nfs_force_lookup_revalidate(dir);
 738         dir->i_version = cinfo->after;
 739         nfs_fscache_invalidate(dir);
 740         spin_unlock(&dir->i_lock);
 741 }
 742
 743 struct nfs4_opendata {
 744         struct kref kref;
 745         struct nfs_openargs o_arg;
 746         struct nfs_openres o_res;
 747         struct nfs_open_confirmargs c_arg;
 748         struct nfs_open_confirmres c_res;
 749         struct nfs4_string owner_name;
 750         struct nfs4_string group_name;
 751         struct nfs_fattr f_attr;
 752         struct dentry *dir;
 753         struct dentry *dentry;
 754         struct nfs4_state_owner *owner;
 755         struct nfs4_state *state;
 756         struct iattr attrs;
 757         unsigned long timestamp;
 758         unsigned int rpc_done : 1;
 759         int rpc_status;
 760         int cancelled;
 761 };
 762
 763
 764 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 765 {
 766         p->o_res.f_attr = &p->f_attr;
 767         p->o_res.seqid = p->o_arg.seqid;
 768         p->c_res.seqid = p->c_arg.seqid;
 769         p->o_res.server = p->o_arg.server;
 770         p->o_res.access_request = p->o_arg.access;
 771         nfs_fattr_init(&p->f_attr);
 772         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 773 }
 774
 775 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 776                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 777                 const struct iattr *attrs,
 778                 gfp_t gfp_mask)
 779 {
 780         struct dentry *parent = dget_parent(dentry);
 781         struct inode *dir = parent->d_inode;
 782         struct nfs_server *server = NFS_SERVER(dir);
 783         struct nfs4_opendata *p;
 784
 785         p = kzalloc(sizeof(*p), gfp_mask);
 786         if (p == NULL)
 787                 goto err;
 788         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 789         if (p->o_arg.seqid == NULL)
 790                 goto err_free;
 791         nfs_sb_active(dentry->d_sb);
 792         p->dentry = dget(dentry);
 793         p->dir = parent;
 794         p->owner = sp;
 795         atomic_inc(&sp->so_count);
 796         p->o_arg.fh = NFS_FH(dir);
 797         p->o_arg.open_flags = flags;
 798         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 799         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 800          * will return permission denied for all bits until close */
 801         if (!(flags & O_EXCL)) {
 802                 /* ask server to check for all possible rights as results
 803                  * are cached */
 804                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 805                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 806         }
 807         p->o_arg.clientid = server->nfs_client->cl_clientid;
 808         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 809         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 810         p->o_arg.name = &dentry->d_name;
 811         p->o_arg.server = server;
 812         p->o_arg.bitmask = server->attr_bitmask;
 813         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 814         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 815         if (attrs != NULL && attrs->ia_valid != 0) {
 816                 __be32 verf[2];
 817
 818                 p->o_arg.u.attrs = &p->attrs;
 819                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 820
 821                 verf[0] = jiffies;
 822                 verf[1] = current->pid;
 823                 memcpy(p->o_arg.u.verifier.data, verf,
 824                                 sizeof(p->o_arg.u.verifier.data));
 825         }
 826         p->c_arg.fh = &p->o_res.fh;
 827         p->c_arg.stateid = &p->o_res.stateid;
 828         p->c_arg.seqid = p->o_arg.seqid;
 829         nfs4_init_opendata_res(p);
 830         kref_init(&p->kref);
 831         return p;
 832 err_free:
 833         kfree(p);
 834 err:
 835         dput(parent);
 836         return NULL;
 837 }
 838
 839 static void nfs4_opendata_free(struct kref *kref)
 840 {
 841         struct nfs4_opendata *p = container_of(kref,
 842                         struct nfs4_opendata, kref);
 843         struct super_block *sb = p->dentry->d_sb;
 844
 845         nfs_free_seqid(p->o_arg.seqid);
 846         if (p->state != NULL)
 847                 nfs4_put_open_state(p->state);
 848         nfs4_put_state_owner(p->owner);
 849         dput(p->dir);
 850         dput(p->dentry);
 851         nfs_sb_deactive(sb);
 852         nfs_fattr_free_names(&p->f_attr);
 853         kfree(p);
 854 }
 855
 856 static void nfs4_opendata_put(struct nfs4_opendata *p)
 857 {
 858         if (p != NULL)
 859                 kref_put(&p->kref, nfs4_opendata_free);
 860 }
 861
 862 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 863 {
 864         int ret;
 865
 866         ret = rpc_wait_for_completion_task(task);
 867         return ret;
 868 }
 869
 870 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 871 {
 872         int ret = 0;
 873
 874         if (open_mode & (O_EXCL|O_TRUNC))
 875                 goto out;
 876         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 877                 case FMODE_READ:
 878                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 879                                 && state->n_rdonly != 0;
 880                         break;
 881                 case FMODE_WRITE:
 882                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 883                                 && state->n_wronly != 0;
 884                         break;
 885                 case FMODE_READ|FMODE_WRITE:
 886                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 887                                 && state->n_rdwr != 0;
 888         }
 889 out:
 890         return ret;
 891 }
 892
 893 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 894 {
 895         if (delegation == NULL)
 896                 return 0;
 897         if ((delegation->type & fmode) != fmode)
 898                 return 0;
 899         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 900                 return 0;
 901         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 902                 return 0;
 903         nfs_mark_delegation_referenced(delegation);
 904         return 1;
 905 }
 906
 907 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 908 {
 909         switch (fmode) {
 910                 case FMODE_WRITE:
 911                         state->n_wronly++;
 912                         break;
 913                 case FMODE_READ:
 914                         state->n_rdonly++;
 915                         break;
 916                 case FMODE_READ|FMODE_WRITE:
 917                         state->n_rdwr++;
 918         }
 919         nfs4_state_set_mode_locked(state, state->state | fmode);
 920 }
 921
 922 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 923 {
 924         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 925                 nfs4_stateid_copy(&state->stateid, stateid);
 926         nfs4_stateid_copy(&state->open_stateid, stateid);
 927         switch (fmode) {
 928                 case FMODE_READ:
 929                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 930                         break;
 931                 case FMODE_WRITE:
 932                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 933                         break;
 934                 case FMODE_READ|FMODE_WRITE:
 935                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 936         }
 937 }
 938
 939 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 940 {
 941         write_seqlock(&state->seqlock);
 942         nfs_set_open_stateid_locked(state, stateid, fmode);
 943         write_sequnlock(&state->seqlock);
 944 }
 945
 946 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 947 {
 948         /*
 949          * Protect the call to nfs4_state_set_mode_locked and
 950          * serialise the stateid update
 951          */
 952         write_seqlock(&state->seqlock);
 953         if (deleg_stateid != NULL) {
 954                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 955                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 956         }
 957         if (open_stateid != NULL)
 958                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 959         write_sequnlock(&state->seqlock);
 960         spin_lock(&state->owner->so_lock);
 961         update_open_stateflags(state, fmode);
 962         spin_unlock(&state->owner->so_lock);
 963 }
 964
 965 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 966 {
 967         struct nfs_inode *nfsi = NFS_I(state->inode);
 968         struct nfs_delegation *deleg_cur;
 969         int ret = 0;
 970
 971         fmode &= (FMODE_READ|FMODE_WRITE);
 972
 973         rcu_read_lock();
 974         deleg_cur = rcu_dereference(nfsi->delegation);
 975         if (deleg_cur == NULL)
 976                 goto no_delegation;
 977
 978         spin_lock(&deleg_cur->lock);
 979         if (nfsi->delegation != deleg_cur ||
 980            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
 981             (deleg_cur->type & fmode) != fmode)
 982                 goto no_delegation_unlock;
 983
 984         if (delegation == NULL)
 985                 delegation = &deleg_cur->stateid;
 986         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 987                 goto no_delegation_unlock;
 988
 989         nfs_mark_delegation_referenced(deleg_cur);
 990         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 991         ret = 1;
 992 no_delegation_unlock:
 993         spin_unlock(&deleg_cur->lock);
 994 no_delegation:
 995         rcu_read_unlock();
 996
 997         if (!ret && open_stateid != NULL) {
 998                 __update_open_stateid(state, open_stateid, NULL, fmode);
 999                 ret = 1;
1000         }
1001
1002         return ret;
1003 }
1004
1005
1006 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1007 {
1008         struct nfs_delegation *delegation;
1009
1010         rcu_read_lock();
1011         delegation = rcu_dereference(NFS_I(inode)->delegation);
1012         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1013                 rcu_read_unlock();
1014                 return;
1015         }
1016         rcu_read_unlock();
1017         nfs4_inode_return_delegation(inode);
1018 }
1019
1020 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1021 {
1022         struct nfs4_state *state = opendata->state;
1023         struct nfs_inode *nfsi = NFS_I(state->inode);
1024         struct nfs_delegation *delegation;
1025         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1026         fmode_t fmode = opendata->o_arg.fmode;
1027         nfs4_stateid stateid;
1028         int ret = -EAGAIN;
1029
1030         for (;;) {
1031                 if (can_open_cached(state, fmode, open_mode)) {
1032                         spin_lock(&state->owner->so_lock);
1033                         if (can_open_cached(state, fmode, open_mode)) {
1034                                 update_open_stateflags(state, fmode);
1035                                 spin_unlock(&state->owner->so_lock);
1036                                 goto out_return_state;
1037                         }
1038                         spin_unlock(&state->owner->so_lock);
1039                 }
1040                 rcu_read_lock();
1041                 delegation = rcu_dereference(nfsi->delegation);
1042                 if (!can_open_delegated(delegation, fmode)) {
1043                         rcu_read_unlock();
1044                         break;
1045                 }
1046                 /* Save the delegation */
1047                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1048                 rcu_read_unlock();
1049                 nfs_release_seqid(opendata->o_arg.seqid);
1050                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1051                 if (ret != 0)
1052                         goto out;
1053                 ret = -EAGAIN;
1054
1055                 /* Try to update the stateid using the delegation */
1056                 if (update_open_stateid(state, NULL, &stateid, fmode))
1057                         goto out_return_state;
1058         }
1059 out:
1060         return ERR_PTR(ret);
1061 out_return_state:
1062         atomic_inc(&state->count);
1063         return state;
1064 }
1065
1066 static void
1067 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1068 {
1069         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1070         struct nfs_delegation *delegation;
1071         int delegation_flags = 0;
1072
1073         rcu_read_lock();
1074         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1075         if (delegation)
1076                 delegation_flags = delegation->flags;
1077         rcu_read_unlock();
1078         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1079                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1080                                    "returning a delegation for "
1081                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1082                                    clp->cl_hostname);
1083         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1084                 nfs_inode_set_delegation(state->inode,
1085                                          data->owner->so_cred,
1086                                          &data->o_res);
1087         else
1088                 nfs_inode_reclaim_delegation(state->inode,
1089                                              data->owner->so_cred,
1090                                              &data->o_res);
1091 }
1092
1093 /*
1094  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1095  * and update the nfs4_state.
1096  */
1097 static struct nfs4_state *
1098 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1099 {
1100         struct inode *inode = data->state->inode;
1101         struct nfs4_state *state = data->state;
1102         int ret;
1103
1104         if (!data->rpc_done) {
1105                 ret = data->rpc_status;
1106                 goto err;
1107         }
1108
1109         ret = -ESTALE;
1110         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1111             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1112             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1113                 goto err;
1114
1115         ret = -ENOMEM;
1116         state = nfs4_get_open_state(inode, data->owner);
1117         if (state == NULL)
1118                 goto err;
1119
1120         ret = nfs_refresh_inode(inode, &data->f_attr);
1121         if (ret)
1122                 goto err;
1123
1124         if (data->o_res.delegation_type != 0)
1125                 nfs4_opendata_check_deleg(data, state);
1126         update_open_stateid(state, &data->o_res.stateid, NULL,
1127                             data->o_arg.fmode);
1128
1129         return state;
1130 err:
1131         return ERR_PTR(ret);
1132
1133 }
1134
1135 static struct nfs4_state *
1136 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1137 {
1138         struct inode *inode;
1139         struct nfs4_state *state = NULL;
1140         int ret;
1141
1142         if (!data->rpc_done) {
1143                 state = nfs4_try_open_cached(data);
1144                 goto out;
1145         }
1146
1147         ret = -EAGAIN;
1148         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1149                 goto err;
1150         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1151         ret = PTR_ERR(inode);
1152         if (IS_ERR(inode))
1153                 goto err;
1154         ret = -ENOMEM;
1155         state = nfs4_get_open_state(inode, data->owner);
1156         if (state == NULL)
1157                 goto err_put_inode;
1158         if (data->o_res.delegation_type != 0)
1159                 nfs4_opendata_check_deleg(data, state);
1160         update_open_stateid(state, &data->o_res.stateid, NULL,
1161                         data->o_arg.fmode);
1162         iput(inode);
1163 out:
1164         nfs_release_seqid(data->o_arg.seqid);
1165         return state;
1166 err_put_inode:
1167         iput(inode);
1168 err:
1169         return ERR_PTR(ret);
1170 }
1171
1172 static struct nfs4_state *
1173 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1174 {
1175         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1176                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1177         return _nfs4_opendata_to_nfs4_state(data);
1178 }
1179
1180 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1181 {
1182         struct nfs_inode *nfsi = NFS_I(state->inode);
1183         struct nfs_open_context *ctx;
1184
1185         spin_lock(&state->inode->i_lock);
1186         list_for_each_entry(ctx, &nfsi->open_files, list) {
1187                 if (ctx->state != state)
1188                         continue;
1189                 get_nfs_open_context(ctx);
1190                 spin_unlock(&state->inode->i_lock);
1191                 return ctx;
1192         }
1193         spin_unlock(&state->inode->i_lock);
1194         return ERR_PTR(-ENOENT);
1195 }
1196
1197 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1198 {
1199         struct nfs4_opendata *opendata;
1200
1201         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1202         if (opendata == NULL)
1203                 return ERR_PTR(-ENOMEM);
1204         opendata->state = state;
1205         atomic_inc(&state->count);
1206         return opendata;
1207 }
1208
1209 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1210 {
1211         struct nfs4_state *newstate;
1212         int ret;
1213
1214         opendata->o_arg.open_flags = 0;
1215         opendata->o_arg.fmode = fmode;
1216         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1217         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1218         nfs4_init_opendata_res(opendata);
1219         ret = _nfs4_recover_proc_open(opendata);
1220         if (ret != 0)
1221                 return ret;
1222         newstate = nfs4_opendata_to_nfs4_state(opendata);
1223         if (IS_ERR(newstate))
1224                 return PTR_ERR(newstate);
1225         nfs4_close_state(newstate, fmode);
1226         *res = newstate;
1227         return 0;
1228 }
1229
1230 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1231 {
1232         struct nfs4_state *newstate;
1233         int ret;
1234
1235         /* memory barrier prior to reading state->n_* */
1236         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1237         smp_rmb();
1238         if (state->n_rdwr != 0) {
1239                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1240                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1241                 if (ret != 0)
1242                         return ret;
1243                 if (newstate != state)
1244                         return -ESTALE;
1245         }
1246         if (state->n_wronly != 0) {
1247                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1248                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1249                 if (ret != 0)
1250                         return ret;
1251                 if (newstate != state)
1252                         return -ESTALE;
1253         }
1254         if (state->n_rdonly != 0) {
1255                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1256                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1257                 if (ret != 0)
1258                         return ret;
1259                 if (newstate != state)
1260                         return -ESTALE;
1261         }
1262         /*
1263          * We may have performed cached opens for all three recoveries.
1264          * Check if we need to update the current stateid.
1265          */
1266         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1267             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1268                 write_seqlock(&state->seqlock);
1269                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1270                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1271                 write_sequnlock(&state->seqlock);
1272         }
1273         return 0;
1274 }
1275
1276 /*
1277  * OPEN_RECLAIM:
1278  *      reclaim state on the server after a reboot.
1279  */
1280 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1281 {
1282         struct nfs_delegation *delegation;
1283         struct nfs4_opendata *opendata;
1284         fmode_t delegation_type = 0;
1285         int status;
1286
1287         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1288         if (IS_ERR(opendata))
1289                 return PTR_ERR(opendata);
1290         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1291         opendata->o_arg.fh = NFS_FH(state->inode);
1292         rcu_read_lock();
1293         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1294         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1295                 delegation_type = delegation->type;
1296         rcu_read_unlock();
1297         opendata->o_arg.u.delegation_type = delegation_type;
1298         status = nfs4_open_recover(opendata, state);
1299         nfs4_opendata_put(opendata);
1300         return status;
1301 }
1302
1303 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1304 {
1305         struct nfs_server *server = NFS_SERVER(state->inode);
1306         struct nfs4_exception exception = { };
1307         int err;
1308         do {
1309                 err = _nfs4_do_open_reclaim(ctx, state);
1310                 if (err != -NFS4ERR_DELAY)
1311                         break;
1312                 nfs4_handle_exception(server, err, &exception);
1313         } while (exception.retry);
1314         return err;
1315 }
1316
1317 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1318 {
1319         struct nfs_open_context *ctx;
1320         int ret;
1321
1322         ctx = nfs4_state_find_open_context(state);
1323         if (IS_ERR(ctx))
1324                 return PTR_ERR(ctx);
1325         ret = nfs4_do_open_reclaim(ctx, state);
1326         put_nfs_open_context(ctx);
1327         return ret;
1328 }
1329
1330 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1331 {
1332         struct nfs4_opendata *opendata;
1333         int ret;
1334
1335         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1336         if (IS_ERR(opendata))
1337                 return PTR_ERR(opendata);
1338         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1339         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1340         ret = nfs4_open_recover(opendata, state);
1341         nfs4_opendata_put(opendata);
1342         return ret;
1343 }
1344
1345 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1346 {
1347         struct nfs4_exception exception = { };
1348         struct nfs_server *server = NFS_SERVER(state->inode);
1349         int err;
1350         do {
1351                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1352                 switch (err) {
1353                         case 0:
1354                         case -ENOENT:
1355                         case -ESTALE:
1356                                 goto out;
1357                         case -NFS4ERR_BADSESSION:
1358                         case -NFS4ERR_BADSLOT:
1359                         case -NFS4ERR_BAD_HIGH_SLOT:
1360                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1361                         case -NFS4ERR_DEADSESSION:
1362                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1363                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1364                                 err = -EAGAIN;
1365                                 goto out;
1366                         case -NFS4ERR_STALE_CLIENTID:
1367                         case -NFS4ERR_STALE_STATEID:
1368                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1369                         case -NFS4ERR_EXPIRED:
1370                                 /* Don't recall a delegation if it was lost */
1371                                 nfs4_schedule_lease_recovery(server->nfs_client);
1372                                 err = -EAGAIN;
1373                                 goto out;
1374                         case -NFS4ERR_DELEG_REVOKED:
1375                         case -NFS4ERR_ADMIN_REVOKED:
1376                         case -NFS4ERR_BAD_STATEID:
1377                                 nfs_inode_find_state_and_recover(state->inode,
1378                                                 stateid);
1379                                 nfs4_schedule_stateid_recovery(server, state);
1380                         case -ENOMEM:
1381                                 err = 0;
1382                                 goto out;
1383                         case -NFS4ERR_DELAY:
1384                         case -NFS4ERR_GRACE:
1385                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1386                                 ssleep(1);
1387                                 err = -EAGAIN;
1388                                 goto out;
1389                 }
1390                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1391                 err = nfs4_handle_exception(server, err, &exception);
1392         } while (exception.retry);
1393 out:
1394         return err;
1395 }
1396
1397 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1398 {
1399         struct nfs4_opendata *data = calldata;
1400
1401         data->rpc_status = task->tk_status;
1402         if (data->rpc_status == 0) {
1403                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1404                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1405                 renew_lease(data->o_res.server, data->timestamp);
1406                 data->rpc_done = 1;
1407         }
1408 }
1409
1410 static void nfs4_open_confirm_release(void *calldata)
1411 {
1412         struct nfs4_opendata *data = calldata;
1413         struct nfs4_state *state = NULL;
1414
1415         /* If this request hasn't been cancelled, do nothing */
1416         if (data->cancelled == 0)
1417                 goto out_free;
1418         /* In case of error, no cleanup! */
1419         if (!data->rpc_done)
1420                 goto out_free;
1421         state = nfs4_opendata_to_nfs4_state(data);
1422         if (!IS_ERR(state))
1423                 nfs4_close_state(state, data->o_arg.fmode);
1424 out_free:
1425         nfs4_opendata_put(data);
1426 }
1427
1428 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1429         .rpc_call_done = nfs4_open_confirm_done,
1430         .rpc_release = nfs4_open_confirm_release,
1431 };
1432
1433 /*
1434  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1435  */
1436 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1437 {
1438         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1439         struct rpc_task *task;
1440         struct  rpc_message msg = {
1441                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1442                 .rpc_argp = &data->c_arg,
1443                 .rpc_resp = &data->c_res,
1444                 .rpc_cred = data->owner->so_cred,
1445         };
1446         struct rpc_task_setup task_setup_data = {
1447                 .rpc_client = server->client,
1448                 .rpc_message = &msg,
1449                 .callback_ops = &nfs4_open_confirm_ops,
1450                 .callback_data = data,
1451                 .workqueue = nfsiod_workqueue,
1452                 .flags = RPC_TASK_ASYNC,
1453         };
1454         int status;
1455
1456         kref_get(&data->kref);
1457         data->rpc_done = 0;
1458         data->rpc_status = 0;
1459         data->timestamp = jiffies;
1460         task = rpc_run_task(&task_setup_data);
1461         if (IS_ERR(task))
1462                 return PTR_ERR(task);
1463         status = nfs4_wait_for_completion_rpc_task(task);
1464         if (status != 0) {
1465                 data->cancelled = 1;
1466                 smp_wmb();
1467         } else
1468                 status = data->rpc_status;
1469         rpc_put_task(task);
1470         return status;
1471 }
1472
1473 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1474 {
1475         struct nfs4_opendata *data = calldata;
1476         struct nfs4_state_owner *sp = data->owner;
1477
1478         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1479                 goto out_wait;
1480         /*
1481          * Check if we still need to send an OPEN call, or if we can use
1482          * a delegation instead.
1483          */
1484         if (data->state != NULL) {
1485                 struct nfs_delegation *delegation;
1486
1487                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1488                         goto out_no_action;
1489                 rcu_read_lock();
1490                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1491                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1492                     can_open_delegated(delegation, data->o_arg.fmode))
1493                         goto unlock_no_action;
1494                 rcu_read_unlock();
1495         }
1496         /* Update client id. */
1497         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1498         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1499                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1500                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1501                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1502         }
1503         data->timestamp = jiffies;
1504         if (nfs4_setup_sequence(data->o_arg.server,
1505                                 &data->o_arg.seq_args,
1506                                 &data->o_res.seq_res,
1507                                 task) != 0)
1508                 nfs_release_seqid(data->o_arg.seqid);
1509         return;
1510 unlock_no_action:
1511         rcu_read_unlock();
1512 out_no_action:
1513         task->tk_action = NULL;
1514 out_wait:
1515         nfs4_sequence_done(task, &data->o_res.seq_res);
1516 }
1517
1518 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1519 {
1520         struct nfs4_opendata *data = calldata;
1521
1522         data->rpc_status = task->tk_status;
1523
1524         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1525                 return;
1526
1527         if (task->tk_status == 0) {
1528                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1529                         switch (data->o_res.f_attr->mode & S_IFMT) {
1530                         case S_IFREG:
1531                                 break;
1532                         case S_IFLNK:
1533                                 data->rpc_status = -ELOOP;
1534                                 break;
1535                         case S_IFDIR:
1536                                 data->rpc_status = -EISDIR;
1537                                 break;
1538                         default:
1539                                 data->rpc_status = -ENOTDIR;
1540                         }
1541                 }
1542                 renew_lease(data->o_res.server, data->timestamp);
1543                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1544                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1545         }
1546         data->rpc_done = 1;
1547 }
1548
1549 static void nfs4_open_release(void *calldata)
1550 {
1551         struct nfs4_opendata *data = calldata;
1552         struct nfs4_state *state = NULL;
1553
1554         /* If this request hasn't been cancelled, do nothing */
1555         if (data->cancelled == 0)
1556                 goto out_free;
1557         /* In case of error, no cleanup! */
1558         if (data->rpc_status != 0 || !data->rpc_done)
1559                 goto out_free;
1560         /* In case we need an open_confirm, no cleanup! */
1561         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1562                 goto out_free;
1563         state = nfs4_opendata_to_nfs4_state(data);
1564         if (!IS_ERR(state))
1565                 nfs4_close_state(state, data->o_arg.fmode);
1566 out_free:
1567         nfs4_opendata_put(data);
1568 }
1569
1570 static const struct rpc_call_ops nfs4_open_ops = {
1571         .rpc_call_prepare = nfs4_open_prepare,
1572         .rpc_call_done = nfs4_open_done,
1573         .rpc_release = nfs4_open_release,
1574 };
1575
1576 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1577 {
1578         struct inode *dir = data->dir->d_inode;
1579         struct nfs_server *server = NFS_SERVER(dir);
1580         struct nfs_openargs *o_arg = &data->o_arg;
1581         struct nfs_openres *o_res = &data->o_res;
1582         struct rpc_task *task;
1583         struct rpc_message msg = {
1584                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1585                 .rpc_argp = o_arg,
1586                 .rpc_resp = o_res,
1587                 .rpc_cred = data->owner->so_cred,
1588         };
1589         struct rpc_task_setup task_setup_data = {
1590                 .rpc_client = server->client,
1591                 .rpc_message = &msg,
1592                 .callback_ops = &nfs4_open_ops,
1593                 .callback_data = data,
1594                 .workqueue = nfsiod_workqueue,
1595                 .flags = RPC_TASK_ASYNC,
1596         };
1597         int status;
1598
1599         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1600         kref_get(&data->kref);
1601         data->rpc_done = 0;
1602         data->rpc_status = 0;
1603         data->cancelled = 0;
1604         if (isrecover)
1605                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1606         task = rpc_run_task(&task_setup_data);
1607         if (IS_ERR(task))
1608                 return PTR_ERR(task);
1609         status = nfs4_wait_for_completion_rpc_task(task);
1610         if (status != 0) {
1611                 data->cancelled = 1;
1612                 smp_wmb();
1613         } else
1614                 status = data->rpc_status;
1615         rpc_put_task(task);
1616
1617         return status;
1618 }
1619
1620 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1621 {
1622         struct inode *dir = data->dir->d_inode;
1623         struct nfs_openres *o_res = &data->o_res;
1624         int status;
1625
1626         status = nfs4_run_open_task(data, 1);
1627         if (status != 0 || !data->rpc_done)
1628                 return status;
1629
1630         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1631
1632         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1633                 status = _nfs4_proc_open_confirm(data);
1634                 if (status != 0)
1635                         return status;
1636         }
1637
1638         return status;
1639 }
1640
1641 static int nfs4_opendata_access(struct rpc_cred *cred,
1642                                 struct nfs4_opendata *opendata,
1643                                 struct nfs4_state *state, fmode_t fmode,
1644                                 int openflags)
1645 {
1646         struct nfs_access_entry cache;
1647         u32 mask;
1648
1649         /* access call failed or for some reason the server doesn't
1650          * support any access modes -- defer access call until later */
1651         if (opendata->o_res.access_supported == 0)
1652                 return 0;
1653
1654         mask = 0;
1655         /* don't check MAY_WRITE - a newly created file may not have
1656          * write mode bits, but POSIX allows the creating process to write.
1657          * use openflags to check for exec, because fmode won't
1658          * always have FMODE_EXEC set when file open for exec. */
1659         if (openflags & __FMODE_EXEC) {
1660                 /* ONLY check for exec rights */
1661                 mask = MAY_EXEC;
1662         } else if (fmode & FMODE_READ)
1663                 mask = MAY_READ;
1664
1665         cache.cred = cred;
1666         cache.jiffies = jiffies;
1667         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1668         nfs_access_add_cache(state->inode, &cache);
1669
1670         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1671                 return 0;
1672
1673         /* even though OPEN succeeded, access is denied. Close the file */
1674         nfs4_close_state(state, fmode);
1675         return -EACCES;
1676 }
1677
1678 /*
1679  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1680  */
1681 static int _nfs4_proc_open(struct nfs4_opendata *data)
1682 {
1683         struct inode *dir = data->dir->d_inode;
1684         struct nfs_server *server = NFS_SERVER(dir);
1685         struct nfs_openargs *o_arg = &data->o_arg;
1686         struct nfs_openres *o_res = &data->o_res;
1687         int status;
1688
1689         status = nfs4_run_open_task(data, 0);
1690         if (!data->rpc_done)
1691                 return status;
1692         if (status != 0) {
1693                 if (status == -NFS4ERR_BADNAME &&
1694                                 !(o_arg->open_flags & O_CREAT))
1695                         return -ENOENT;
1696                 return status;
1697         }
1698
1699         nfs_fattr_map_and_free_names(server, &data->f_attr);
1700
1701         if (o_arg->open_flags & O_CREAT)
1702                 update_changeattr(dir, &o_res->cinfo);
1703         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1704                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1705         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1706                 status = _nfs4_proc_open_confirm(data);
1707                 if (status != 0)
1708                         return status;
1709         }
1710         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1711                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1712         return 0;
1713 }
1714
1715 static int nfs4_recover_expired_lease(struct nfs_server *server)
1716 {
1717         return nfs4_client_recover_expired_lease(server->nfs_client);
1718 }
1719
1720 /*
1721  * OPEN_EXPIRED:
1722  *      reclaim state on the server after a network partition.
1723  *      Assumes caller holds the appropriate lock
1724  */
1725 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1726 {
1727         struct nfs4_opendata *opendata;
1728         int ret;
1729
1730         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1731         if (IS_ERR(opendata))
1732                 return PTR_ERR(opendata);
1733         ret = nfs4_open_recover(opendata, state);
1734         if (ret == -ESTALE)
1735                 d_drop(ctx->dentry);
1736         nfs4_opendata_put(opendata);
1737         return ret;
1738 }
1739
1740 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1741 {
1742         struct nfs_server *server = NFS_SERVER(state->inode);
1743         struct nfs4_exception exception = { };
1744         int err;
1745
1746         do {
1747                 err = _nfs4_open_expired(ctx, state);
1748                 switch (err) {
1749                 default:
1750                         goto out;
1751                 case -NFS4ERR_GRACE:
1752                 case -NFS4ERR_DELAY:
1753                         nfs4_handle_exception(server, err, &exception);
1754                         err = 0;
1755                 }
1756         } while (exception.retry);
1757 out:
1758         return err;
1759 }
1760
1761 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1762 {
1763         struct nfs_open_context *ctx;
1764         int ret;
1765
1766         ctx = nfs4_state_find_open_context(state);
1767         if (IS_ERR(ctx))
1768                 return PTR_ERR(ctx);
1769         ret = nfs4_do_open_expired(ctx, state);
1770         put_nfs_open_context(ctx);
1771         return ret;
1772 }
1773
1774 #if defined(CONFIG_NFS_V4_1)
1775 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1776 {
1777         struct nfs_server *server = NFS_SERVER(state->inode);
1778         nfs4_stateid *stateid = &state->stateid;
1779         int status;
1780
1781         /* If a state reset has been done, test_stateid is unneeded */
1782         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1783                 return;
1784
1785         status = nfs41_test_stateid(server, stateid);
1786         if (status != NFS_OK) {
1787                 /* Free the stateid unless the server explicitly
1788                  * informs us the stateid is unrecognized. */
1789                 if (status != -NFS4ERR_BAD_STATEID)
1790                         nfs41_free_stateid(server, stateid);
1791                 nfs_remove_bad_delegation(state->inode);
1792
1793                 write_seqlock(&state->seqlock);
1794                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1795                 write_sequnlock(&state->seqlock);
1796                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1797         }
1798 }
1799
1800 /**
1801  * nfs41_check_open_stateid - possibly free an open stateid
1802  *
1803  * @state: NFSv4 state for an inode
1804  *
1805  * Returns NFS_OK if recovery for this stateid is now finished.
1806  * Otherwise a negative NFS4ERR value is returned.
1807  */
1808 static int nfs41_check_open_stateid(struct nfs4_state *state)
1809 {
1810         struct nfs_server *server = NFS_SERVER(state->inode);
1811         nfs4_stateid *stateid = &state->open_stateid;
1812         int status;
1813
1814         /* If a state reset has been done, test_stateid is unneeded */
1815         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1816             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1817             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1818                 return -NFS4ERR_BAD_STATEID;
1819
1820         status = nfs41_test_stateid(server, stateid);
1821         if (status != NFS_OK) {
1822                 /* Free the stateid unless the server explicitly
1823                  * informs us the stateid is unrecognized. */
1824                 if (status != -NFS4ERR_BAD_STATEID)
1825                         nfs41_free_stateid(server, stateid);
1826
1827                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1828                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1829                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1830         }
1831         return status;
1832 }
1833
1834 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1835 {
1836         int status;
1837
1838         nfs41_clear_delegation_stateid(state);
1839         status = nfs41_check_open_stateid(state);
1840         if (status != NFS_OK)
1841                 status = nfs4_open_expired(sp, state);
1842         return status;
1843 }
1844 #endif
1845
1846 /*
1847  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1848  * fields corresponding to attributes that were used to store the verifier.
1849  * Make sure we clobber those fields in the later setattr call
1850  */
1851 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1852 {
1853         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1854             !(sattr->ia_valid & ATTR_ATIME_SET))
1855                 sattr->ia_valid |= ATTR_ATIME;
1856
1857         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1858             !(sattr->ia_valid & ATTR_MTIME_SET))
1859                 sattr->ia_valid |= ATTR_MTIME;
1860 }
1861
1862 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1863                 fmode_t fmode,
1864                 int flags,
1865                 struct nfs4_state **res)
1866 {
1867         struct nfs4_state_owner *sp = opendata->owner;
1868         struct nfs_server *server = sp->so_server;
1869         struct nfs4_state *state;
1870         unsigned int seq;
1871         int ret;
1872
1873         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1874
1875         ret = _nfs4_proc_open(opendata);
1876         if (ret != 0)
1877                 goto out;
1878
1879         state = nfs4_opendata_to_nfs4_state(opendata);
1880         ret = PTR_ERR(state);
1881         if (IS_ERR(state))
1882                 goto out;
1883         if (server->caps & NFS_CAP_POSIX_LOCK)
1884                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1885
1886         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1887         if (ret != 0)
1888                 goto out;
1889
1890         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
1891                 nfs4_schedule_stateid_recovery(server, state);
1892                 nfs4_wait_clnt_recover(server->nfs_client);
1893         }
1894         *res = state;
1895 out:
1896         return ret;
1897 }
1898
1899 /*
1900  * Returns a referenced nfs4_state
1901  */
1902 static int _nfs4_do_open(struct inode *dir,
1903                         struct dentry *dentry,
1904                         fmode_t fmode,
1905                         int flags,
1906                         struct iattr *sattr,
1907                         struct rpc_cred *cred,
1908                         struct nfs4_state **res,
1909                         struct nfs4_threshold **ctx_th)
1910 {
1911         struct nfs4_state_owner  *sp;
1912         struct nfs4_state     *state = NULL;
1913         struct nfs_server       *server = NFS_SERVER(dir);
1914         struct nfs4_opendata *opendata;
1915         int status;
1916
1917         /* Protect against reboot recovery conflicts */
1918         status = -ENOMEM;
1919         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1920         if (sp == NULL) {
1921                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1922                 goto out_err;
1923         }
1924         status = nfs4_recover_expired_lease(server);
1925         if (status != 0)
1926                 goto err_put_state_owner;
1927         if (dentry->d_inode != NULL)
1928                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1929         status = -ENOMEM;
1930         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1931         if (opendata == NULL)
1932                 goto err_put_state_owner;
1933
1934         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1935                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1936                 if (!opendata->f_attr.mdsthreshold)
1937                         goto err_opendata_put;
1938                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1939         }
1940         if (dentry->d_inode != NULL)
1941                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1942
1943         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
1944         if (status != 0)
1945                 goto err_opendata_put;
1946
1947         if (opendata->o_arg.open_flags & O_EXCL) {
1948                 nfs4_exclusive_attrset(opendata, sattr);
1949
1950                 nfs_fattr_init(opendata->o_res.f_attr);
1951                 status = nfs4_do_setattr(state->inode, cred,
1952                                 opendata->o_res.f_attr, sattr,
1953                                 state);
1954                 if (status == 0)
1955                         nfs_setattr_update_inode(state->inode, sattr);
1956                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1957         }
1958
1959         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1960                 *ctx_th = opendata->f_attr.mdsthreshold;
1961         else
1962                 kfree(opendata->f_attr.mdsthreshold);
1963         opendata->f_attr.mdsthreshold = NULL;
1964
1965         nfs4_opendata_put(opendata);
1966         nfs4_put_state_owner(sp);
1967         *res = state;
1968         return 0;
1969 err_opendata_put:
1970         kfree(opendata->f_attr.mdsthreshold);
1971         nfs4_opendata_put(opendata);
1972 err_put_state_owner:
1973         nfs4_put_state_owner(sp);
1974 out_err:
1975         *res = NULL;
1976         return status;
1977 }
1978
1979
1980 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1981                                         struct dentry *dentry,
1982                                         fmode_t fmode,
1983                                         int flags,
1984                                         struct iattr *sattr,
1985                                         struct rpc_cred *cred,
1986                                         struct nfs4_threshold **ctx_th)
1987 {
1988         struct nfs4_exception exception = { };
1989         struct nfs4_state *res;
1990         int status;
1991
1992         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1993         do {
1994                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1995                                        &res, ctx_th);
1996                 if (status == 0)
1997                         break;
1998                 /* NOTE: BAD_SEQID means the server and client disagree about the
1999                  * book-keeping w.r.t. state-changing operations
2000                  * (OPEN/CLOSE/LOCK/LOCKU...)
2001                  * It is actually a sign of a bug on the client or on the server.
2002                  *
2003                  * If we receive a BAD_SEQID error in the particular case of
2004                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2005                  * have unhashed the old state_owner for us, and that we can
2006                  * therefore safely retry using a new one. We should still warn
2007                  * the user though...
2008                  */
2009                 if (status == -NFS4ERR_BAD_SEQID) {
2010                         pr_warn_ratelimited("NFS: v4 server %s "
2011                                         " returned a bad sequence-id error!\n",
2012                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2013                         exception.retry = 1;
2014                         continue;
2015                 }
2016                 /*
2017                  * BAD_STATEID on OPEN means that the server cancelled our
2018                  * state before it received the OPEN_CONFIRM.
2019                  * Recover by retrying the request as per the discussion
2020                  * on Page 181 of RFC3530.
2021                  */
2022                 if (status == -NFS4ERR_BAD_STATEID) {
2023                         exception.retry = 1;
2024                         continue;
2025                 }
2026                 if (status == -EAGAIN) {
2027                         /* We must have found a delegation */
2028                         exception.retry = 1;
2029                         continue;
2030                 }
2031                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2032                                         status, &exception));
2033         } while (exception.retry);
2034         return res;
2035 }
2036
2037 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2038                             struct nfs_fattr *fattr, struct iattr *sattr,
2039                             struct nfs4_state *state)
2040 {
2041         struct nfs_server *server = NFS_SERVER(inode);
2042         struct nfs_setattrargs  arg = {
2043                 .fh             = NFS_FH(inode),
2044                 .iap            = sattr,
2045                 .server         = server,
2046                 .bitmask = server->attr_bitmask,
2047         };
2048         struct nfs_setattrres  res = {
2049                 .fattr          = fattr,
2050                 .server         = server,
2051         };
2052         struct rpc_message msg = {
2053                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2054                 .rpc_argp       = &arg,
2055                 .rpc_resp       = &res,
2056                 .rpc_cred       = cred,
2057         };
2058         unsigned long timestamp = jiffies;
2059         int status;
2060
2061         nfs_fattr_init(fattr);
2062
2063         if (state != NULL) {
2064                 struct nfs_lockowner lockowner = {
2065                         .l_owner = current->files,
2066                         .l_pid = current->tgid,
2067                 };
2068                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2069                                 &lockowner);
2070         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2071                                 FMODE_WRITE)) {
2072                 /* Use that stateid */
2073         } else
2074                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2075
2076         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2077         if (status == 0 && state != NULL)
2078                 renew_lease(server, timestamp);
2079         return status;
2080 }
2081
2082 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2083                            struct nfs_fattr *fattr, struct iattr *sattr,
2084                            struct nfs4_state *state)
2085 {
2086         struct nfs_server *server = NFS_SERVER(inode);
2087         struct nfs4_exception exception = {
2088                 .state = state,
2089                 .inode = inode,
2090         };
2091         int err;
2092         do {
2093                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2094                 switch (err) {
2095                 case -NFS4ERR_OPENMODE:
2096                         if (state && !(state->state & FMODE_WRITE)) {
2097                                 err = -EBADF;
2098                                 if (sattr->ia_valid & ATTR_OPEN)
2099                                         err = -EACCES;
2100                                 goto out;
2101                         }
2102                 }
2103                 err = nfs4_handle_exception(server, err, &exception);
2104         } while (exception.retry);
2105 out:
2106         return err;
2107 }
2108
2109 struct nfs4_closedata {
2110         struct inode *inode;
2111         struct nfs4_state *state;
2112         struct nfs_closeargs arg;
2113         struct nfs_closeres res;
2114         struct nfs_fattr fattr;
2115         unsigned long timestamp;
2116         bool roc;
2117         u32 roc_barrier;
2118 };
2119
2120 static void nfs4_free_closedata(void *data)
2121 {
2122         struct nfs4_closedata *calldata = data;
2123         struct nfs4_state_owner *sp = calldata->state->owner;
2124         struct super_block *sb = calldata->state->inode->i_sb;
2125
2126         if (calldata->roc)
2127                 pnfs_roc_release(calldata->state->inode);
2128         nfs4_put_open_state(calldata->state);
2129         nfs_free_seqid(calldata->arg.seqid);
2130         nfs4_put_state_owner(sp);
2131         nfs_sb_deactive(sb);
2132         kfree(calldata);
2133 }
2134
2135 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2136                 fmode_t fmode)
2137 {
2138         spin_lock(&state->owner->so_lock);
2139         if (!(fmode & FMODE_READ))
2140                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2141         if (!(fmode & FMODE_WRITE))
2142                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2143         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2144         spin_unlock(&state->owner->so_lock);
2145 }
2146
2147 static void nfs4_close_done(struct rpc_task *task, void *data)
2148 {
2149         struct nfs4_closedata *calldata = data;
2150         struct nfs4_state *state = calldata->state;
2151         struct nfs_server *server = NFS_SERVER(calldata->inode);
2152
2153         dprintk("%s: begin!\n", __func__);
2154         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2155                 return;
2156         /* hmm. we are done with the inode, and in the process of freeing
2157          * the state_owner. we keep this around to process errors
2158          */
2159         switch (task->tk_status) {
2160                 case 0:
2161                         if (calldata->roc)
2162                                 pnfs_roc_set_barrier(state->inode,
2163                                                      calldata->roc_barrier);
2164                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2165                         renew_lease(server, calldata->timestamp);
2166                         nfs4_close_clear_stateid_flags(state,
2167                                         calldata->arg.fmode);
2168                         break;
2169                 case -NFS4ERR_STALE_STATEID:
2170                 case -NFS4ERR_OLD_STATEID:
2171                 case -NFS4ERR_BAD_STATEID:
2172                 case -NFS4ERR_EXPIRED:
2173                         if (calldata->arg.fmode == 0)
2174                                 break;
2175                 default:
2176                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2177                                 rpc_restart_call_prepare(task);
2178         }
2179         nfs_release_seqid(calldata->arg.seqid);
2180         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2181         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2182 }
2183
2184 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2185 {
2186         struct nfs4_closedata *calldata = data;
2187         struct nfs4_state *state = calldata->state;
2188         struct inode *inode = calldata->inode;
2189         int call_close = 0;
2190
2191         dprintk("%s: begin!\n", __func__);
2192         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2193                 goto out_wait;
2194
2195         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2196         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2197         spin_lock(&state->owner->so_lock);
2198         /* Calculate the change in open mode */
2199         if (state->n_rdwr == 0) {
2200                 if (state->n_rdonly == 0) {
2201                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2202                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2203                         calldata->arg.fmode &= ~FMODE_READ;
2204                 }
2205                 if (state->n_wronly == 0) {
2206                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2207                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2208                         calldata->arg.fmode &= ~FMODE_WRITE;
2209                 }
2210         }
2211         spin_unlock(&state->owner->so_lock);
2212
2213         if (!call_close) {
2214                 /* Note: exit _without_ calling nfs4_close_done */
2215                 goto out_no_action;
2216         }
2217
2218         if (calldata->arg.fmode == 0) {
2219                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2220                 if (calldata->roc &&
2221                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2222                         goto out_wait;
2223         }
2224
2225         nfs_fattr_init(calldata->res.fattr);
2226         calldata->timestamp = jiffies;
2227         if (nfs4_setup_sequence(NFS_SERVER(inode),
2228                                 &calldata->arg.seq_args,
2229                                 &calldata->res.seq_res,
2230                                 task) != 0)
2231                 nfs_release_seqid(calldata->arg.seqid);
2232         dprintk("%s: done!\n", __func__);
2233         return;
2234 out_no_action:
2235         task->tk_action = NULL;
2236 out_wait:
2237         nfs4_sequence_done(task, &calldata->res.seq_res);
2238 }
2239
2240 static const struct rpc_call_ops nfs4_close_ops = {
2241         .rpc_call_prepare = nfs4_close_prepare,
2242         .rpc_call_done = nfs4_close_done,
2243         .rpc_release = nfs4_free_closedata,
2244 };
2245
2246 /*
2247  * It is possible for data to be read/written from a mem-mapped file
2248  * after the sys_close call (which hits the vfs layer as a flush).
2249  * This means that we can't safely call nfsv4 close on a file until
2250  * the inode is cleared. This in turn means that we are not good
2251  * NFSv4 citizens - we do not indicate to the server to update the file's
2252  * share state even when we are done with one of the three share
2253  * stateid's in the inode.
2254  *
2255  * NOTE: Caller must be holding the sp->so_owner semaphore!
2256  */
2257 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2258 {
2259         struct nfs_server *server = NFS_SERVER(state->inode);
2260         struct nfs4_closedata *calldata;
2261         struct nfs4_state_owner *sp = state->owner;
2262         struct rpc_task *task;
2263         struct rpc_message msg = {
2264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2265                 .rpc_cred = state->owner->so_cred,
2266         };
2267         struct rpc_task_setup task_setup_data = {
2268                 .rpc_client = server->client,
2269                 .rpc_message = &msg,
2270                 .callback_ops = &nfs4_close_ops,
2271                 .workqueue = nfsiod_workqueue,
2272                 .flags = RPC_TASK_ASYNC,
2273         };
2274         int status = -ENOMEM;
2275
2276         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2277         if (calldata == NULL)
2278                 goto out;
2279         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2280         calldata->inode = state->inode;
2281         calldata->state = state;
2282         calldata->arg.fh = NFS_FH(state->inode);
2283         calldata->arg.stateid = &state->open_stateid;
2284         /* Serialization for the sequence id */
2285         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2286         if (calldata->arg.seqid == NULL)
2287                 goto out_free_calldata;
2288         calldata->arg.fmode = 0;
2289         calldata->arg.bitmask = server->cache_consistency_bitmask;
2290         calldata->res.fattr = &calldata->fattr;
2291         calldata->res.seqid = calldata->arg.seqid;
2292         calldata->res.server = server;
2293         calldata->roc = pnfs_roc(state->inode);
2294         nfs_sb_active(calldata->inode->i_sb);
2295
2296         msg.rpc_argp = &calldata->arg;
2297         msg.rpc_resp = &calldata->res;
2298         task_setup_data.callback_data = calldata;
2299         task = rpc_run_task(&task_setup_data);
2300         if (IS_ERR(task))
2301                 return PTR_ERR(task);
2302         status = 0;
2303         if (wait)
2304                 status = rpc_wait_for_completion_task(task);
2305         rpc_put_task(task);
2306         return status;
2307 out_free_calldata:
2308         kfree(calldata);
2309 out:
2310         nfs4_put_open_state(state);
2311         nfs4_put_state_owner(sp);
2312         return status;
2313 }
2314
2315 static struct inode *
2316 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2317 {
2318         struct nfs4_state *state;
2319
2320         /* Protect against concurrent sillydeletes */
2321         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2322                              ctx->cred, &ctx->mdsthreshold);
2323         if (IS_ERR(state))
2324                 return ERR_CAST(state);
2325         ctx->state = state;
2326         return igrab(state->inode);
2327 }
2328
2329 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2330 {
2331         if (ctx->state == NULL)
2332                 return;
2333         if (is_sync)
2334                 nfs4_close_sync(ctx->state, ctx->mode);
2335         else
2336                 nfs4_close_state(ctx->state, ctx->mode);
2337 }
2338
2339 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2340 {
2341         struct nfs4_server_caps_arg args = {
2342                 .fhandle = fhandle,
2343         };
2344         struct nfs4_server_caps_res res = {};
2345         struct rpc_message msg = {
2346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2347                 .rpc_argp = &args,
2348                 .rpc_resp = &res,
2349         };
2350         int status;
2351
2352         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2353         if (status == 0) {
2354                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2355                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2356                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2357                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2358                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2359                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2360                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2361                         server->caps |= NFS_CAP_ACLS;
2362                 if (res.has_links != 0)
2363                         server->caps |= NFS_CAP_HARDLINKS;
2364                 if (res.has_symlinks != 0)
2365                         server->caps |= NFS_CAP_SYMLINKS;
2366                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2367                         server->caps |= NFS_CAP_FILEID;
2368                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2369                         server->caps |= NFS_CAP_MODE;
2370                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2371                         server->caps |= NFS_CAP_NLINK;
2372                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2373                         server->caps |= NFS_CAP_OWNER;
2374                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2375                         server->caps |= NFS_CAP_OWNER_GROUP;
2376                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2377                         server->caps |= NFS_CAP_ATIME;
2378                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2379                         server->caps |= NFS_CAP_CTIME;
2380                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2381                         server->caps |= NFS_CAP_MTIME;
2382
2383                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2384                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2385                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2386                 server->acl_bitmask = res.acl_bitmask;
2387                 server->fh_expire_type = res.fh_expire_type;
2388         }
2389
2390         return status;
2391 }
2392
2393 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2394 {
2395         struct nfs4_exception exception = { };
2396         int err;
2397         do {
2398                 err = nfs4_handle_exception(server,
2399                                 _nfs4_server_capabilities(server, fhandle),
2400                                 &exception);
2401         } while (exception.retry);
2402         return err;
2403 }
2404
2405 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2406                 struct nfs_fsinfo *info)
2407 {
2408         struct nfs4_lookup_root_arg args = {
2409                 .bitmask = nfs4_fattr_bitmap,
2410         };
2411         struct nfs4_lookup_res res = {
2412                 .server = server,
2413                 .fattr = info->fattr,
2414                 .fh = fhandle,
2415         };
2416         struct rpc_message msg = {
2417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2418                 .rpc_argp = &args,
2419                 .rpc_resp = &res,
2420         };
2421
2422         nfs_fattr_init(info->fattr);
2423         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2424 }
2425
2426 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2427                 struct nfs_fsinfo *info)
2428 {
2429         struct nfs4_exception exception = { };
2430         int err;
2431         do {
2432                 err = _nfs4_lookup_root(server, fhandle, info);
2433                 switch (err) {
2434                 case 0:
2435                 case -NFS4ERR_WRONGSEC:
2436                         goto out;
2437                 default:
2438                         err = nfs4_handle_exception(server, err, &exception);
2439                 }
2440         } while (exception.retry);
2441 out:
2442         return err;
2443 }
2444
2445 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2446                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2447 {
2448         struct rpc_auth *auth;
2449         int ret;
2450
2451         auth = rpcauth_create(flavor, server->client);
2452         if (IS_ERR(auth)) {
2453                 ret = -EIO;
2454                 goto out;
2455         }
2456         ret = nfs4_lookup_root(server, fhandle, info);
2457 out:
2458         return ret;
2459 }
2460
2461 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2462                               struct nfs_fsinfo *info)
2463 {
2464         int i, len, status = 0;
2465         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2466
2467         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2468         if (len < 0)
2469                 return len;
2470
2471         for (i = 0; i < len; i++) {
2472                 /* AUTH_UNIX is the default flavor if none was specified,
2473                  * thus has already been tried. */
2474                 if (flav_array[i] == RPC_AUTH_UNIX)
2475                         continue;
2476
2477                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2478                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2479                         continue;
2480                 break;
2481         }
2482         /*
2483          * -EACCESS could mean that the user doesn't have correct permissions
2484          * to access the mount.  It could also mean that we tried to mount
2485          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2486          * existing mount programs don't handle -EACCES very well so it should
2487          * be mapped to -EPERM instead.
2488          */
2489         if (status == -EACCES)
2490                 status = -EPERM;
2491         return status;
2492 }
2493
2494 /*
2495  * get the file handle for the "/" directory on the server
2496  */
2497 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2498                          struct nfs_fsinfo *info)
2499 {
2500         int minor_version = server->nfs_client->cl_minorversion;
2501         int status = nfs4_lookup_root(server, fhandle, info);
2502         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2503                 /*
2504                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2505                  * by nfs4_map_errors() as this function exits.
2506                  */
2507                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2508         if (status == 0)
2509                 status = nfs4_server_capabilities(server, fhandle);
2510         if (status == 0)
2511                 status = nfs4_do_fsinfo(server, fhandle, info);
2512         return nfs4_map_errors(status);
2513 }
2514
2515 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2516                               struct nfs_fsinfo *info)
2517 {
2518         int error;
2519         struct nfs_fattr *fattr = info->fattr;
2520
2521         error = nfs4_server_capabilities(server, mntfh);
2522         if (error < 0) {
2523                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2524                 return error;
2525         }
2526
2527         error = nfs4_proc_getattr(server, mntfh, fattr);
2528         if (error < 0) {
2529                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2530                 return error;
2531         }
2532
2533         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2534             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2535                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2536
2537         return error;
2538 }
2539
2540 /*
2541  * Get locations and (maybe) other attributes of a referral.
2542  * Note that we'll actually follow the referral later when
2543  * we detect fsid mismatch in inode revalidation
2544  */
2545 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2546                              const struct qstr *name, struct nfs_fattr *fattr,
2547                              struct nfs_fh *fhandle)
2548 {
2549         int status = -ENOMEM;
2550         struct page *page = NULL;
2551         struct nfs4_fs_locations *locations = NULL;
2552
2553         page = alloc_page(GFP_KERNEL);
2554         if (page == NULL)
2555                 goto out;
2556         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2557         if (locations == NULL)
2558                 goto out;
2559
2560         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2561         if (status != 0)
2562                 goto out;
2563         /* Make sure server returned a different fsid for the referral */
2564         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2565                 dprintk("%s: server did not return a different fsid for"
2566                         " a referral at %s\n", __func__, name->name);
2567                 status = -EIO;
2568                 goto out;
2569         }
2570         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2571         nfs_fixup_referral_attributes(&locations->fattr);
2572
2573         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2574         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2575         memset(fhandle, 0, sizeof(struct nfs_fh));
2576 out:
2577         if (page)
2578                 __free_page(page);
2579         kfree(locations);
2580         return status;
2581 }
2582
2583 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2584 {
2585         struct nfs4_getattr_arg args = {
2586                 .fh = fhandle,
2587                 .bitmask = server->attr_bitmask,
2588         };
2589         struct nfs4_getattr_res res = {
2590                 .fattr = fattr,
2591                 .server = server,
2592         };
2593         struct rpc_message msg = {
2594                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2595                 .rpc_argp = &args,
2596                 .rpc_resp = &res,
2597         };
2598
2599         nfs_fattr_init(fattr);
2600         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2601 }
2602
2603 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2604 {
2605         struct nfs4_exception exception = { };
2606         int err;
2607         do {
2608                 err = nfs4_handle_exception(server,
2609                                 _nfs4_proc_getattr(server, fhandle, fattr),
2610                                 &exception);
2611         } while (exception.retry);
2612         return err;
2613 }
2614
2615 /*
2616  * The file is not closed if it is opened due to the a request to change
2617  * the size of the file. The open call will not be needed once the
2618  * VFS layer lookup-intents are implemented.
2619  *
2620  * Close is called when the inode is destroyed.
2621  * If we haven't opened the file for O_WRONLY, we
2622  * need to in the size_change case to obtain a stateid.
2623  *
2624  * Got race?
2625  * Because OPEN is always done by name in nfsv4, it is
2626  * possible that we opened a different file by the same
2627  * name.  We can recognize this race condition, but we
2628  * can't do anything about it besides returning an error.
2629  *
2630  * This will be fixed with VFS changes (lookup-intent).
2631  */
2632 static int
2633 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2634                   struct iattr *sattr)
2635 {
2636         struct inode *inode = dentry->d_inode;
2637         struct rpc_cred *cred = NULL;
2638         struct nfs4_state *state = NULL;
2639         int status;
2640
2641         if (pnfs_ld_layoutret_on_setattr(inode))
2642                 pnfs_commit_and_return_layout(inode);
2643
2644         nfs_fattr_init(fattr);
2645
2646         /* Deal with open(O_TRUNC) */
2647         if (sattr->ia_valid & ATTR_OPEN)
2648                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2649
2650         /* Optimization: if the end result is no change, don't RPC */
2651         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2652                 return 0;
2653
2654         /* Search for an existing open(O_WRITE) file */
2655         if (sattr->ia_valid & ATTR_FILE) {
2656                 struct nfs_open_context *ctx;
2657
2658                 ctx = nfs_file_open_context(sattr->ia_file);
2659                 if (ctx) {
2660                         cred = ctx->cred;
2661                         state = ctx->state;
2662                 }
2663         }
2664
2665         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2666         if (status == 0)
2667                 nfs_setattr_update_inode(inode, sattr);
2668         return status;
2669 }
2670
2671 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2672                 const struct qstr *name, struct nfs_fh *fhandle,
2673                 struct nfs_fattr *fattr)
2674 {
2675         struct nfs_server *server = NFS_SERVER(dir);
2676         int                    status;
2677         struct nfs4_lookup_arg args = {
2678                 .bitmask = server->attr_bitmask,
2679                 .dir_fh = NFS_FH(dir),
2680                 .name = name,
2681         };
2682         struct nfs4_lookup_res res = {
2683                 .server = server,
2684                 .fattr = fattr,
2685                 .fh = fhandle,
2686         };
2687         struct rpc_message msg = {
2688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2689                 .rpc_argp = &args,
2690                 .rpc_resp = &res,
2691         };
2692
2693         nfs_fattr_init(fattr);
2694
2695         dprintk("NFS call  lookup %s\n", name->name);
2696         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2697         dprintk("NFS reply lookup: %d\n", status);
2698         return status;
2699 }
2700
2701 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2702 {
2703         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2704                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2705         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2706         fattr->nlink = 2;
2707 }
2708
2709 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2710                                    struct qstr *name, struct nfs_fh *fhandle,
2711                                    struct nfs_fattr *fattr)
2712 {
2713         struct nfs4_exception exception = { };
2714         struct rpc_clnt *client = *clnt;
2715         int err;
2716         do {
2717                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2718                 switch (err) {
2719                 case -NFS4ERR_BADNAME:
2720                         err = -ENOENT;
2721                         goto out;
2722                 case -NFS4ERR_MOVED:
2723                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2724                         goto out;
2725                 case -NFS4ERR_WRONGSEC:
2726                         err = -EPERM;
2727                         if (client != *clnt)
2728                                 goto out;
2729
2730                         client = nfs4_create_sec_client(client, dir, name);
2731                         if (IS_ERR(client))
2732                                 return PTR_ERR(client);
2733
2734                         exception.retry = 1;
2735                         break;
2736                 default:
2737                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2738                 }
2739         } while (exception.retry);
2740
2741 out:
2742         if (err == 0)
2743                 *clnt = client;
2744         else if (client != *clnt)
2745                 rpc_shutdown_client(client);
2746
2747         return err;
2748 }
2749
2750 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2751                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2752 {
2753         int status;
2754         struct rpc_clnt *client = NFS_CLIENT(dir);
2755
2756         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2757         if (client != NFS_CLIENT(dir)) {
2758                 rpc_shutdown_client(client);
2759                 nfs_fixup_secinfo_attributes(fattr);
2760         }
2761         return status;
2762 }
2763
2764 struct rpc_clnt *
2765 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2766                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2767 {
2768         int status;
2769         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2770
2771         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2772         if (status < 0) {
2773                 rpc_shutdown_client(client);
2774                 return ERR_PTR(status);
2775         }
2776         return client;
2777 }
2778
2779 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2780 {
2781         struct nfs_server *server = NFS_SERVER(inode);
2782         struct nfs4_accessargs args = {
2783                 .fh = NFS_FH(inode),
2784                 .bitmask = server->cache_consistency_bitmask,
2785         };
2786         struct nfs4_accessres res = {
2787                 .server = server,
2788         };
2789         struct rpc_message msg = {
2790                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2791                 .rpc_argp = &args,
2792                 .rpc_resp = &res,
2793                 .rpc_cred = entry->cred,
2794         };
2795         int mode = entry->mask;
2796         int status;
2797
2798         /*
2799          * Determine which access bits we want to ask for...
2800          */
2801         if (mode & MAY_READ)
2802                 args.access |= NFS4_ACCESS_READ;
2803         if (S_ISDIR(inode->i_mode)) {
2804                 if (mode & MAY_WRITE)
2805                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2806                 if (mode & MAY_EXEC)
2807                         args.access |= NFS4_ACCESS_LOOKUP;
2808         } else {
2809                 if (mode & MAY_WRITE)
2810                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2811                 if (mode & MAY_EXEC)
2812                         args.access |= NFS4_ACCESS_EXECUTE;
2813         }
2814
2815         res.fattr = nfs_alloc_fattr();
2816         if (res.fattr == NULL)
2817                 return -ENOMEM;
2818
2819         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2820         if (!status) {
2821                 nfs_access_set_mask(entry, res.access);
2822                 nfs_refresh_inode(inode, res.fattr);
2823         }
2824         nfs_free_fattr(res.fattr);
2825         return status;
2826 }
2827
2828 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2829 {
2830         struct nfs4_exception exception = { };
2831         int err;
2832         do {
2833                 err = nfs4_handle_exception(NFS_SERVER(inode),
2834                                 _nfs4_proc_access(inode, entry),
2835                                 &exception);
2836         } while (exception.retry);
2837         return err;
2838 }
2839
2840 /*
2841  * TODO: For the time being, we don't try to get any attributes
2842  * along with any of the zero-copy operations READ, READDIR,
2843  * READLINK, WRITE.
2844  *
2845  * In the case of the first three, we want to put the GETATTR
2846  * after the read-type operation -- this is because it is hard
2847  * to predict the length of a GETATTR response in v4, and thus
2848  * align the READ data correctly.  This means that the GETATTR
2849  * may end up partially falling into the page cache, and we should
2850  * shift it into the 'tail' of the xdr_buf before processing.
2851  * To do this efficiently, we need to know the total length
2852  * of data received, which doesn't seem to be available outside
2853  * of the RPC layer.
2854  *
2855  * In the case of WRITE, we also want to put the GETATTR after
2856  * the operation -- in this case because we want to make sure
2857  * we get the post-operation mtime and size.
2858  *
2859  * Both of these changes to the XDR layer would in fact be quite
2860  * minor, but I decided to leave them for a subsequent patch.
2861  */
2862 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2863                 unsigned int pgbase, unsigned int pglen)
2864 {
2865         struct nfs4_readlink args = {
2866                 .fh       = NFS_FH(inode),
2867                 .pgbase   = pgbase,
2868                 .pglen    = pglen,
2869                 .pages    = &page,
2870         };
2871         struct nfs4_readlink_res res;
2872         struct rpc_message msg = {
2873                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2874                 .rpc_argp = &args,
2875                 .rpc_resp = &res,
2876         };
2877
2878         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2879 }
2880
2881 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2882                 unsigned int pgbase, unsigned int pglen)
2883 {
2884         struct nfs4_exception exception = { };
2885         int err;
2886         do {
2887                 err = nfs4_handle_exception(NFS_SERVER(inode),
2888                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2889                                 &exception);
2890         } while (exception.retry);
2891         return err;
2892 }
2893
2894 /*
2895  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2896  */
2897 static int
2898 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2899                  int flags)
2900 {
2901         struct nfs_open_context *ctx;
2902         struct nfs4_state *state;
2903         int status = 0;
2904
2905         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2906         if (IS_ERR(ctx))
2907                 return PTR_ERR(ctx);
2908
2909         sattr->ia_mode &= ~current_umask();
2910         state = nfs4_do_open(dir, dentry, ctx->mode,
2911                         flags, sattr, ctx->cred,
2912                         &ctx->mdsthreshold);
2913         d_drop(dentry);
2914         if (IS_ERR(state)) {
2915                 status = PTR_ERR(state);
2916                 goto out;
2917         }
2918         d_add(dentry, igrab(state->inode));
2919         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2920         ctx->state = state;
2921 out:
2922         put_nfs_open_context(ctx);
2923         return status;
2924 }
2925
2926 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2927 {
2928         struct nfs_server *server = NFS_SERVER(dir);
2929         struct nfs_removeargs args = {
2930                 .fh = NFS_FH(dir),
2931                 .name = *name,
2932         };
2933         struct nfs_removeres res = {
2934                 .server = server,
2935         };
2936         struct rpc_message msg = {
2937                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2938                 .rpc_argp = &args,
2939                 .rpc_resp = &res,
2940         };
2941         int status;
2942
2943         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2944         if (status == 0)
2945                 update_changeattr(dir, &res.cinfo);
2946         return status;
2947 }
2948
2949 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2950 {
2951         struct nfs4_exception exception = { };
2952         int err;
2953         do {
2954                 err = nfs4_handle_exception(NFS_SERVER(dir),
2955                                 _nfs4_proc_remove(dir, name),
2956                                 &exception);
2957         } while (exception.retry);
2958         return err;
2959 }
2960
2961 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2962 {
2963         struct nfs_server *server = NFS_SERVER(dir);
2964         struct nfs_removeargs *args = msg->rpc_argp;
2965         struct nfs_removeres *res = msg->rpc_resp;
2966
2967         res->server = server;
2968         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2969         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2970 }
2971
2972 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2973 {
2974         nfs4_setup_sequence(NFS_SERVER(data->dir),
2975                         &data->args.seq_args,
2976                         &data->res.seq_res,
2977                         task);
2978 }
2979
2980 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2981 {
2982         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2983
2984         if (!nfs4_sequence_done(task, &res->seq_res))
2985                 return 0;
2986         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2987                 return 0;
2988         update_changeattr(dir, &res->cinfo);
2989         return 1;
2990 }
2991
2992 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2993 {
2994         struct nfs_server *server = NFS_SERVER(dir);
2995         struct nfs_renameargs *arg = msg->rpc_argp;
2996         struct nfs_renameres *res = msg->rpc_resp;
2997
2998         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2999         res->server = server;
3000         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3001 }
3002
3003 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3004 {
3005         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3006                         &data->args.seq_args,
3007                         &data->res.seq_res,
3008                         task);
3009 }
3010
3011 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3012                                  struct inode *new_dir)
3013 {
3014         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3015
3016         if (!nfs4_sequence_done(task, &res->seq_res))
3017                 return 0;
3018         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3019                 return 0;
3020
3021         update_changeattr(old_dir, &res->old_cinfo);
3022         update_changeattr(new_dir, &res->new_cinfo);
3023         return 1;
3024 }
3025
3026 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3027                 struct inode *new_dir, struct qstr *new_name)
3028 {
3029         struct nfs_server *server = NFS_SERVER(old_dir);
3030         struct nfs_renameargs arg = {
3031                 .old_dir = NFS_FH(old_dir),
3032                 .new_dir = NFS_FH(new_dir),
3033                 .old_name = old_name,
3034                 .new_name = new_name,
3035         };
3036         struct nfs_renameres res = {
3037                 .server = server,
3038         };
3039         struct rpc_message msg = {
3040                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3041                 .rpc_argp = &arg,
3042                 .rpc_resp = &res,
3043         };
3044         int status = -ENOMEM;
3045
3046         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3047         if (!status) {
3048                 update_changeattr(old_dir, &res.old_cinfo);
3049                 update_changeattr(new_dir, &res.new_cinfo);
3050         }
3051         return status;
3052 }
3053
3054 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3055                 struct inode *new_dir, struct qstr *new_name)
3056 {
3057         struct nfs4_exception exception = { };
3058         int err;
3059         do {
3060                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3061                                 _nfs4_proc_rename(old_dir, old_name,
3062                                         new_dir, new_name),
3063                                 &exception);
3064         } while (exception.retry);
3065         return err;
3066 }
3067
3068 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3069 {
3070         struct nfs_server *server = NFS_SERVER(inode);
3071         struct nfs4_link_arg arg = {
3072                 .fh     = NFS_FH(inode),
3073                 .dir_fh = NFS_FH(dir),
3074                 .name   = name,
3075                 .bitmask = server->attr_bitmask,
3076         };
3077         struct nfs4_link_res res = {
3078                 .server = server,
3079         };
3080         struct rpc_message msg = {
3081                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3082                 .rpc_argp = &arg,
3083                 .rpc_resp = &res,
3084         };
3085         int status = -ENOMEM;
3086
3087         res.fattr = nfs_alloc_fattr();
3088         if (res.fattr == NULL)
3089                 goto out;
3090
3091         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3092         if (!status) {
3093                 update_changeattr(dir, &res.cinfo);
3094                 nfs_post_op_update_inode(inode, res.fattr);
3095         }
3096 out:
3097         nfs_free_fattr(res.fattr);
3098         return status;
3099 }
3100
3101 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3102 {
3103         struct nfs4_exception exception = { };
3104         int err;
3105         do {
3106                 err = nfs4_handle_exception(NFS_SERVER(inode),
3107                                 _nfs4_proc_link(inode, dir, name),
3108                                 &exception);
3109         } while (exception.retry);
3110         return err;
3111 }
3112
3113 struct nfs4_createdata {
3114         struct rpc_message msg;
3115         struct nfs4_create_arg arg;
3116         struct nfs4_create_res res;
3117         struct nfs_fh fh;
3118         struct nfs_fattr fattr;
3119 };
3120
3121 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3122                 struct qstr *name, struct iattr *sattr, u32 ftype)
3123 {
3124         struct nfs4_createdata *data;
3125
3126         data = kzalloc(sizeof(*data), GFP_KERNEL);
3127         if (data != NULL) {
3128                 struct nfs_server *server = NFS_SERVER(dir);
3129
3130                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3131                 data->msg.rpc_argp = &data->arg;
3132                 data->msg.rpc_resp = &data->res;
3133                 data->arg.dir_fh = NFS_FH(dir);
3134                 data->arg.server = server;
3135                 data->arg.name = name;
3136                 data->arg.attrs = sattr;
3137                 data->arg.ftype = ftype;
3138                 data->arg.bitmask = server->attr_bitmask;
3139                 data->res.server = server;
3140                 data->res.fh = &data->fh;
3141                 data->res.fattr = &data->fattr;
3142                 nfs_fattr_init(data->res.fattr);
3143         }
3144         return data;
3145 }
3146
3147 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3148 {
3149         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3150                                     &data->arg.seq_args, &data->res.seq_res, 1);
3151         if (status == 0) {
3152                 update_changeattr(dir, &data->res.dir_cinfo);
3153                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3154         }
3155         return status;
3156 }
3157
3158 static void nfs4_free_createdata(struct nfs4_createdata *data)
3159 {
3160         kfree(data);
3161 }
3162
3163 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3164                 struct page *page, unsigned int len, struct iattr *sattr)
3165 {
3166         struct nfs4_createdata *data;
3167         int status = -ENAMETOOLONG;
3168
3169         if (len > NFS4_MAXPATHLEN)
3170                 goto out;
3171
3172         status = -ENOMEM;
3173         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3174         if (data == NULL)
3175                 goto out;
3176
3177         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3178         data->arg.u.symlink.pages = &page;
3179         data->arg.u.symlink.len = len;
3180
3181         status = nfs4_do_create(dir, dentry, data);
3182
3183         nfs4_free_createdata(data);
3184 out:
3185         return status;
3186 }
3187
3188 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3189                 struct page *page, unsigned int len, struct iattr *sattr)
3190 {
3191         struct nfs4_exception exception = { };
3192         int err;
3193         do {
3194                 err = nfs4_handle_exception(NFS_SERVER(dir),
3195                                 _nfs4_proc_symlink(dir, dentry, page,
3196                                                         len, sattr),
3197                                 &exception);
3198         } while (exception.retry);
3199         return err;
3200 }
3201
3202 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3203                 struct iattr *sattr)
3204 {
3205         struct nfs4_createdata *data;
3206         int status = -ENOMEM;
3207
3208         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3209         if (data == NULL)
3210                 goto out;
3211
3212         status = nfs4_do_create(dir, dentry, data);
3213
3214         nfs4_free_createdata(data);
3215 out:
3216         return status;
3217 }
3218
3219 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3220                 struct iattr *sattr)
3221 {
3222         struct nfs4_exception exception = { };
3223         int err;
3224
3225         sattr->ia_mode &= ~current_umask();
3226         do {
3227                 err = nfs4_handle_exception(NFS_SERVER(dir),
3228                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3229                                 &exception);
3230         } while (exception.retry);
3231         return err;
3232 }
3233
3234 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3235                 u64 cookie, struct page **pages, unsigned int count, int plus)
3236 {
3237         struct inode            *dir = dentry->d_inode;
3238         struct nfs4_readdir_arg args = {
3239                 .fh = NFS_FH(dir),
3240                 .pages = pages,
3241                 .pgbase = 0,
3242                 .count = count,
3243                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3244                 .plus = plus,
3245         };
3246         struct nfs4_readdir_res res;
3247         struct rpc_message msg = {
3248                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3249                 .rpc_argp = &args,
3250                 .rpc_resp = &res,
3251                 .rpc_cred = cred,
3252         };
3253         int                     status;
3254
3255         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3256                         dentry->d_parent->d_name.name,
3257                         dentry->d_name.name,
3258                         (unsigned long long)cookie);
3259         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3260         res.pgbase = args.pgbase;
3261         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3262         if (status >= 0) {
3263                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3264                 status += args.pgbase;
3265         }
3266
3267         nfs_invalidate_atime(dir);
3268
3269         dprintk("%s: returns %d\n", __func__, status);
3270         return status;
3271 }
3272
3273 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3274                 u64 cookie, struct page **pages, unsigned int count, int plus)
3275 {
3276         struct nfs4_exception exception = { };
3277         int err;
3278         do {
3279                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3280                                 _nfs4_proc_readdir(dentry, cred, cookie,
3281                                         pages, count, plus),
3282                                 &exception);
3283         } while (exception.retry);
3284         return err;
3285 }
3286
3287 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3288                 struct iattr *sattr, dev_t rdev)
3289 {
3290         struct nfs4_createdata *data;
3291         int mode = sattr->ia_mode;
3292         int status = -ENOMEM;
3293
3294         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3295         if (data == NULL)
3296                 goto out;
3297
3298         if (S_ISFIFO(mode))
3299                 data->arg.ftype = NF4FIFO;
3300         else if (S_ISBLK(mode)) {
3301                 data->arg.ftype = NF4BLK;
3302                 data->arg.u.device.specdata1 = MAJOR(rdev);
3303                 data->arg.u.device.specdata2 = MINOR(rdev);
3304         }
3305         else if (S_ISCHR(mode)) {
3306                 data->arg.ftype = NF4CHR;
3307                 data->arg.u.device.specdata1 = MAJOR(rdev);
3308                 data->arg.u.device.specdata2 = MINOR(rdev);
3309         } else if (!S_ISSOCK(mode)) {
3310                 status = -EINVAL;
3311                 goto out_free;
3312         }
3313
3314         status = nfs4_do_create(dir, dentry, data);
3315 out_free:
3316         nfs4_free_createdata(data);
3317 out:
3318         return status;
3319 }
3320
3321 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3322                 struct iattr *sattr, dev_t rdev)
3323 {
3324         struct nfs4_exception exception = { };
3325         int err;
3326
3327         sattr->ia_mode &= ~current_umask();
3328         do {
3329                 err = nfs4_handle_exception(NFS_SERVER(dir),
3330                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3331                                 &exception);
3332         } while (exception.retry);
3333         return err;
3334 }
3335
3336 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3337                  struct nfs_fsstat *fsstat)
3338 {
3339         struct nfs4_statfs_arg args = {
3340                 .fh = fhandle,
3341                 .bitmask = server->attr_bitmask,
3342         };
3343         struct nfs4_statfs_res res = {
3344                 .fsstat = fsstat,
3345         };
3346         struct rpc_message msg = {
3347                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3348                 .rpc_argp = &args,
3349                 .rpc_resp = &res,
3350         };
3351
3352         nfs_fattr_init(fsstat->fattr);
3353         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3354 }
3355
3356 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3357 {
3358         struct nfs4_exception exception = { };
3359         int err;
3360         do {
3361                 err = nfs4_handle_exception(server,
3362                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3363                                 &exception);
3364         } while (exception.retry);
3365         return err;
3366 }
3367
3368 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3369                 struct nfs_fsinfo *fsinfo)
3370 {
3371         struct nfs4_fsinfo_arg args = {
3372                 .fh = fhandle,
3373                 .bitmask = server->attr_bitmask,
3374         };
3375         struct nfs4_fsinfo_res res = {
3376                 .fsinfo = fsinfo,
3377         };
3378         struct rpc_message msg = {
3379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3380                 .rpc_argp = &args,
3381                 .rpc_resp = &res,
3382         };
3383
3384         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3385 }
3386
3387 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3388 {
3389         struct nfs4_exception exception = { };
3390         int err;
3391
3392         do {
3393                 err = nfs4_handle_exception(server,
3394                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3395                                 &exception);
3396         } while (exception.retry);
3397         return err;
3398 }
3399
3400 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3401 {
3402         int error;
3403
3404         nfs_fattr_init(fsinfo->fattr);
3405         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3406         if (error == 0) {
3407                 /* block layout checks this! */
3408                 server->pnfs_blksize = fsinfo->blksize;
3409                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3410         }
3411
3412         return error;
3413 }
3414
3415 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3416                 struct nfs_pathconf *pathconf)
3417 {
3418         struct nfs4_pathconf_arg args = {
3419                 .fh = fhandle,
3420                 .bitmask = server->attr_bitmask,
3421         };
3422         struct nfs4_pathconf_res res = {
3423                 .pathconf = pathconf,
3424         };
3425         struct rpc_message msg = {
3426                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3427                 .rpc_argp = &args,
3428                 .rpc_resp = &res,
3429         };
3430
3431         /* None of the pathconf attributes are mandatory to implement */
3432         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3433                 memset(pathconf, 0, sizeof(*pathconf));
3434                 return 0;
3435         }
3436
3437         nfs_fattr_init(pathconf->fattr);
3438         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3439 }
3440
3441 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3442                 struct nfs_pathconf *pathconf)
3443 {
3444         struct nfs4_exception exception = { };
3445         int err;
3446
3447         do {
3448                 err = nfs4_handle_exception(server,
3449                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3450                                 &exception);
3451         } while (exception.retry);
3452         return err;
3453 }
3454
3455 void __nfs4_read_done_cb(struct nfs_read_data *data)
3456 {
3457         nfs_invalidate_atime(data->header->inode);
3458 }
3459
3460 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3461 {
3462         struct nfs_server *server = NFS_SERVER(data->header->inode);
3463
3464         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3465                 rpc_restart_call_prepare(task);
3466                 return -EAGAIN;
3467         }
3468
3469         __nfs4_read_done_cb(data);
3470         if (task->tk_status > 0)
3471                 renew_lease(server, data->timestamp);
3472         return 0;
3473 }
3474
3475 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3476 {
3477
3478         dprintk("--> %s\n", __func__);
3479
3480         if (!nfs4_sequence_done(task, &data->res.seq_res))
3481                 return -EAGAIN;
3482
3483         return data->read_done_cb ? data->read_done_cb(task, data) :
3484                                     nfs4_read_done_cb(task, data);
3485 }
3486
3487 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3488 {
3489         data->timestamp   = jiffies;
3490         data->read_done_cb = nfs4_read_done_cb;
3491         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3492         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3493 }
3494
3495 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3496 {
3497         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3498                         &data->args.seq_args,
3499                         &data->res.seq_res,
3500                         task);
3501 }
3502
3503 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3504 {
3505         struct inode *inode = data->header->inode;
3506
3507         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3508                 rpc_restart_call_prepare(task);
3509                 return -EAGAIN;
3510         }
3511         if (task->tk_status >= 0) {
3512                 renew_lease(NFS_SERVER(inode), data->timestamp);
3513                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3514         }
3515         return 0;
3516 }
3517
3518 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3519 {
3520         if (!nfs4_sequence_done(task, &data->res.seq_res))
3521                 return -EAGAIN;
3522         return data->write_done_cb ? data->write_done_cb(task, data) :
3523                 nfs4_write_done_cb(task, data);
3524 }
3525
3526 static
3527 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3528 {
3529         const struct nfs_pgio_header *hdr = data->header;
3530
3531         /* Don't request attributes for pNFS or O_DIRECT writes */
3532         if (data->ds_clp != NULL || hdr->dreq != NULL)
3533                 return false;
3534         /* Otherwise, request attributes if and only if we don't hold
3535          * a delegation
3536          */
3537         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3538 }
3539
3540 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3541 {
3542         struct nfs_server *server = NFS_SERVER(data->header->inode);
3543
3544         if (!nfs4_write_need_cache_consistency_data(data)) {
3545                 data->args.bitmask = NULL;
3546                 data->res.fattr = NULL;
3547         } else
3548                 data->args.bitmask = server->cache_consistency_bitmask;
3549
3550         if (!data->write_done_cb)
3551                 data->write_done_cb = nfs4_write_done_cb;
3552         data->res.server = server;
3553         data->timestamp   = jiffies;
3554
3555         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3556         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3557 }
3558
3559 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3560 {
3561         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3562                         &data->args.seq_args,
3563                         &data->res.seq_res,
3564                         task);
3565 }
3566
3567 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3568 {
3569         nfs4_setup_sequence(NFS_SERVER(data->inode),
3570                         &data->args.seq_args,
3571                         &data->res.seq_res,
3572                         task);
3573 }
3574
3575 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3576 {
3577         struct inode *inode = data->inode;
3578
3579         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3580                 rpc_restart_call_prepare(task);
3581                 return -EAGAIN;
3582         }
3583         return 0;
3584 }
3585
3586 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3587 {
3588         if (!nfs4_sequence_done(task, &data->res.seq_res))
3589                 return -EAGAIN;
3590         return data->commit_done_cb(task, data);
3591 }
3592
3593 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3594 {
3595         struct nfs_server *server = NFS_SERVER(data->inode);
3596
3597         if (data->commit_done_cb == NULL)
3598                 data->commit_done_cb = nfs4_commit_done_cb;
3599         data->res.server = server;
3600         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3601         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3602 }
3603
3604 struct nfs4_renewdata {
3605         struct nfs_client       *client;
3606         unsigned long           timestamp;
3607 };
3608
3609 /*
3610  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3611  * standalone procedure for queueing an asynchronous RENEW.
3612  */
3613 static void nfs4_renew_release(void *calldata)
3614 {
3615         struct nfs4_renewdata *data = calldata;
3616         struct nfs_client *clp = data->client;
3617
3618         if (atomic_read(&clp->cl_count) > 1)
3619                 nfs4_schedule_state_renewal(clp);
3620         nfs_put_client(clp);
3621         kfree(data);
3622 }
3623
3624 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3625 {
3626         struct nfs4_renewdata *data = calldata;
3627         struct nfs_client *clp = data->client;
3628         unsigned long timestamp = data->timestamp;
3629
3630         if (task->tk_status < 0) {
3631                 /* Unless we're shutting down, schedule state recovery! */
3632                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3633                         return;
3634                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3635                         nfs4_schedule_lease_recovery(clp);
3636                         return;
3637                 }
3638                 nfs4_schedule_path_down_recovery(clp);
3639         }
3640         do_renew_lease(clp, timestamp);
3641 }
3642
3643 static const struct rpc_call_ops nfs4_renew_ops = {
3644         .rpc_call_done = nfs4_renew_done,
3645         .rpc_release = nfs4_renew_release,
3646 };
3647
3648 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3649 {
3650         struct rpc_message msg = {
3651                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3652                 .rpc_argp       = clp,
3653                 .rpc_cred       = cred,
3654         };
3655         struct nfs4_renewdata *data;
3656
3657         if (renew_flags == 0)
3658                 return 0;
3659         if (!atomic_inc_not_zero(&clp->cl_count))
3660                 return -EIO;
3661         data = kmalloc(sizeof(*data), GFP_NOFS);
3662         if (data == NULL)
3663                 return -ENOMEM;
3664         data->client = clp;
3665         data->timestamp = jiffies;
3666         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3667                         &nfs4_renew_ops, data);
3668 }
3669
3670 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3671 {
3672         struct rpc_message msg = {
3673                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3674                 .rpc_argp       = clp,
3675                 .rpc_cred       = cred,
3676         };
3677         unsigned long now = jiffies;
3678         int status;
3679
3680         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3681         if (status < 0)
3682                 return status;
3683         do_renew_lease(clp, now);
3684         return 0;
3685 }
3686
3687 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3688 {
3689         return (server->caps & NFS_CAP_ACLS)
3690                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3691                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3692 }
3693
3694 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3695  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3696  * the stack.
3697  */
3698 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3699
3700 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3701                 struct page **pages, unsigned int *pgbase)
3702 {
3703         struct page *newpage, **spages;
3704         int rc = 0;
3705         size_t len;
3706         spages = pages;
3707
3708         do {
3709                 len = min_t(size_t, PAGE_SIZE, buflen);
3710                 newpage = alloc_page(GFP_KERNEL);
3711
3712                 if (newpage == NULL)
3713                         goto unwind;
3714                 memcpy(page_address(newpage), buf, len);
3715                 buf += len;
3716                 buflen -= len;
3717                 *pages++ = newpage;
3718                 rc++;
3719         } while (buflen != 0);
3720
3721         return rc;
3722
3723 unwind:
3724         for(; rc > 0; rc--)
3725                 __free_page(spages[rc-1]);
3726         return -ENOMEM;
3727 }
3728
3729 struct nfs4_cached_acl {
3730         int cached;
3731         size_t len;
3732         char data[0];
3733 };
3734
3735 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3736 {
3737         struct nfs_inode *nfsi = NFS_I(inode);
3738
3739         spin_lock(&inode->i_lock);
3740         kfree(nfsi->nfs4_acl);
3741         nfsi->nfs4_acl = acl;
3742         spin_unlock(&inode->i_lock);
3743 }
3744
3745 static void nfs4_zap_acl_attr(struct inode *inode)
3746 {
3747         nfs4_set_cached_acl(inode, NULL);
3748 }
3749
3750 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3751 {
3752         struct nfs_inode *nfsi = NFS_I(inode);
3753         struct nfs4_cached_acl *acl;
3754         int ret = -ENOENT;
3755
3756         spin_lock(&inode->i_lock);
3757         acl = nfsi->nfs4_acl;
3758         if (acl == NULL)
3759                 goto out;
3760         if (buf == NULL) /* user is just asking for length */
3761                 goto out_len;
3762         if (acl->cached == 0)
3763                 goto out;
3764         ret = -ERANGE; /* see getxattr(2) man page */
3765         if (acl->len > buflen)
3766                 goto out;
3767         memcpy(buf, acl->data, acl->len);
3768 out_len:
3769         ret = acl->len;
3770 out:
3771         spin_unlock(&inode->i_lock);
3772         return ret;
3773 }
3774
3775 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3776 {
3777         struct nfs4_cached_acl *acl;
3778         size_t buflen = sizeof(*acl) + acl_len;
3779
3780         if (buflen <= PAGE_SIZE) {
3781                 acl = kmalloc(buflen, GFP_KERNEL);
3782                 if (acl == NULL)
3783                         goto out;
3784                 acl->cached = 1;
3785                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3786         } else {
3787                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3788                 if (acl == NULL)
3789                         goto out;
3790                 acl->cached = 0;
3791         }
3792         acl->len = acl_len;
3793 out:
3794         nfs4_set_cached_acl(inode, acl);
3795 }
3796
3797 /*
3798  * The getxattr API returns the required buffer length when called with a
3799  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3800  * the required buf.  On a NULL buf, we send a page of data to the server
3801  * guessing that the ACL request can be serviced by a page. If so, we cache
3802  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3803  * the cache. If not so, we throw away the page, and cache the required
3804  * length. The next getxattr call will then produce another round trip to
3805  * the server, this time with the input buf of the required size.
3806  */
3807 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3808 {
3809         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3810         struct nfs_getaclargs args = {
3811                 .fh = NFS_FH(inode),
3812                 .acl_pages = pages,
3813                 .acl_len = buflen,
3814         };
3815         struct nfs_getaclres res = {
3816                 .acl_len = buflen,
3817         };
3818         struct rpc_message msg = {
3819                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3820                 .rpc_argp = &args,
3821                 .rpc_resp = &res,
3822         };
3823         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3824         int ret = -ENOMEM, i;
3825
3826         /* As long as we're doing a round trip to the server anyway,
3827          * let's be prepared for a page of acl data. */
3828         if (npages == 0)
3829                 npages = 1;
3830         if (npages > ARRAY_SIZE(pages))
3831                 return -ERANGE;
3832
3833         for (i = 0; i < npages; i++) {
3834                 pages[i] = alloc_page(GFP_KERNEL);
3835                 if (!pages[i])
3836                         goto out_free;
3837         }
3838
3839         /* for decoding across pages */
3840         res.acl_scratch = alloc_page(GFP_KERNEL);
3841         if (!res.acl_scratch)
3842                 goto out_free;
3843
3844         args.acl_len = npages * PAGE_SIZE;
3845         args.acl_pgbase = 0;
3846
3847         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3848                 __func__, buf, buflen, npages, args.acl_len);
3849         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3850                              &msg, &args.seq_args, &res.seq_res, 0);
3851         if (ret)
3852                 goto out_free;
3853
3854         /* Handle the case where the passed-in buffer is too short */
3855         if (res.acl_flags & NFS4_ACL_TRUNC) {
3856                 /* Did the user only issue a request for the acl length? */
3857                 if (buf == NULL)
3858                         goto out_ok;
3859                 ret = -ERANGE;
3860                 goto out_free;
3861         }
3862         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3863         if (buf) {
3864                 if (res.acl_len > buflen) {
3865                         ret = -ERANGE;
3866                         goto out_free;
3867                 }
3868                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3869         }
3870 out_ok:
3871         ret = res.acl_len;
3872 out_free:
3873         for (i = 0; i < npages; i++)
3874                 if (pages[i])
3875                         __free_page(pages[i]);
3876         if (res.acl_scratch)
3877                 __free_page(res.acl_scratch);
3878         return ret;
3879 }
3880
3881 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3882 {
3883         struct nfs4_exception exception = { };
3884         ssize_t ret;
3885         do {
3886                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3887                 if (ret >= 0)
3888                         break;
3889                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3890         } while (exception.retry);
3891         return ret;
3892 }
3893
3894 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3895 {
3896         struct nfs_server *server = NFS_SERVER(inode);
3897         int ret;
3898
3899         if (!nfs4_server_supports_acls(server))
3900                 return -EOPNOTSUPP;
3901         ret = nfs_revalidate_inode(server, inode);
3902         if (ret < 0)
3903                 return ret;
3904         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3905                 nfs_zap_acl_cache(inode);
3906         ret = nfs4_read_cached_acl(inode, buf, buflen);
3907         if (ret != -ENOENT)
3908                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3909                  * but no cached acl data, just the acl length */
3910                 return ret;
3911         return nfs4_get_acl_uncached(inode, buf, buflen);
3912 }
3913
3914 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3915 {
3916         struct nfs_server *server = NFS_SERVER(inode);
3917         struct page *pages[NFS4ACL_MAXPAGES];
3918         struct nfs_setaclargs arg = {
3919                 .fh             = NFS_FH(inode),
3920                 .acl_pages      = pages,
3921                 .acl_len        = buflen,
3922         };
3923         struct nfs_setaclres res;
3924         struct rpc_message msg = {
3925                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3926                 .rpc_argp       = &arg,
3927                 .rpc_resp       = &res,
3928         };
3929         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3930         int ret, i;
3931
3932         if (!nfs4_server_supports_acls(server))
3933                 return -EOPNOTSUPP;
3934         if (npages > ARRAY_SIZE(pages))
3935                 return -ERANGE;
3936         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3937         if (i < 0)
3938                 return i;
3939         nfs4_inode_return_delegation(inode);
3940         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3941
3942         /*
3943          * Free each page after tx, so the only ref left is
3944          * held by the network stack
3945          */
3946         for (; i > 0; i--)
3947                 put_page(pages[i-1]);
3948
3949         /*
3950          * Acl update can result in inode attribute update.
3951          * so mark the attribute cache invalid.
3952          */
3953         spin_lock(&inode->i_lock);
3954         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3955         spin_unlock(&inode->i_lock);
3956         nfs_access_zap_cache(inode);
3957         nfs_zap_acl_cache(inode);
3958         return ret;
3959 }
3960
3961 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3962 {
3963         struct nfs4_exception exception = { };
3964         int err;
3965         do {
3966                 err = nfs4_handle_exception(NFS_SERVER(inode),
3967                                 __nfs4_proc_set_acl(inode, buf, buflen),
3968                                 &exception);
3969         } while (exception.retry);
3970         return err;
3971 }
3972
3973 static int
3974 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3975 {
3976         struct nfs_client *clp = server->nfs_client;
3977
3978         if (task->tk_status >= 0)
3979                 return 0;
3980         switch(task->tk_status) {
3981                 case -NFS4ERR_DELEG_REVOKED:
3982                 case -NFS4ERR_ADMIN_REVOKED:
3983                 case -NFS4ERR_BAD_STATEID:
3984                         if (state == NULL)
3985                                 break;
3986                         nfs_remove_bad_delegation(state->inode);
3987                 case -NFS4ERR_OPENMODE:
3988                         if (state == NULL)
3989                                 break;
3990                         nfs4_schedule_stateid_recovery(server, state);
3991                         goto wait_on_recovery;
3992                 case -NFS4ERR_EXPIRED:
3993                         if (state != NULL)
3994                                 nfs4_schedule_stateid_recovery(server, state);
3995                 case -NFS4ERR_STALE_STATEID:
3996                 case -NFS4ERR_STALE_CLIENTID:
3997                         nfs4_schedule_lease_recovery(clp);
3998                         goto wait_on_recovery;
3999 #if defined(CONFIG_NFS_V4_1)
4000                 case -NFS4ERR_BADSESSION:
4001                 case -NFS4ERR_BADSLOT:
4002                 case -NFS4ERR_BAD_HIGH_SLOT:
4003                 case -NFS4ERR_DEADSESSION:
4004                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4005                 case -NFS4ERR_SEQ_FALSE_RETRY:
4006                 case -NFS4ERR_SEQ_MISORDERED:
4007                         dprintk("%s ERROR %d, Reset session\n", __func__,
4008                                 task->tk_status);
4009                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4010                         task->tk_status = 0;
4011                         return -EAGAIN;
4012 #endif /* CONFIG_NFS_V4_1 */
4013                 case -NFS4ERR_DELAY:
4014                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4015                 case -NFS4ERR_GRACE:
4016                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4017                         task->tk_status = 0;
4018                         return -EAGAIN;
4019                 case -NFS4ERR_RETRY_UNCACHED_REP:
4020                 case -NFS4ERR_OLD_STATEID:
4021                         task->tk_status = 0;
4022                         return -EAGAIN;
4023         }
4024         task->tk_status = nfs4_map_errors(task->tk_status);
4025         return 0;
4026 wait_on_recovery:
4027         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4028         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4029                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4030         task->tk_status = 0;
4031         return -EAGAIN;
4032 }
4033
4034 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4035                                     nfs4_verifier *bootverf)
4036 {
4037         __be32 verf[2];
4038
4039         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4040                 /* An impossible timestamp guarantees this value
4041                  * will never match a generated boot time. */
4042                 verf[0] = 0;
4043                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4044         } else {
4045                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4046                 verf[0] = (__be32)nn->boot_time.tv_sec;
4047                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4048         }
4049         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4050 }
4051
4052 static unsigned int
4053 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4054                                    char *buf, size_t len)
4055 {
4056         unsigned int result;
4057
4058         rcu_read_lock();
4059         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4060                                 clp->cl_ipaddr,
4061                                 rpc_peeraddr2str(clp->cl_rpcclient,
4062                                                         RPC_DISPLAY_ADDR),
4063                                 rpc_peeraddr2str(clp->cl_rpcclient,
4064                                                         RPC_DISPLAY_PROTO));
4065         rcu_read_unlock();
4066         return result;
4067 }
4068
4069 static unsigned int
4070 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4071                                 char *buf, size_t len)
4072 {
4073         char *nodename = clp->cl_rpcclient->cl_nodename;
4074
4075         if (nfs4_client_id_uniquifier[0] != '\0')
4076                 nodename = nfs4_client_id_uniquifier;
4077         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4078                                 clp->rpc_ops->version, clp->cl_minorversion,
4079                                 nodename);
4080 }
4081
4082 /**
4083  * nfs4_proc_setclientid - Negotiate client ID
4084  * @clp: state data structure
4085  * @program: RPC program for NFSv4 callback service
4086  * @port: IP port number for NFS4 callback service
4087  * @cred: RPC credential to use for this call
4088  * @res: where to place the result
4089  *
4090  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4091  */
4092 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4093                 unsigned short port, struct rpc_cred *cred,
4094                 struct nfs4_setclientid_res *res)
4095 {
4096         nfs4_verifier sc_verifier;
4097         struct nfs4_setclientid setclientid = {
4098                 .sc_verifier = &sc_verifier,
4099                 .sc_prog = program,
4100                 .sc_cb_ident = clp->cl_cb_ident,
4101         };
4102         struct rpc_message msg = {
4103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4104                 .rpc_argp = &setclientid,
4105                 .rpc_resp = res,
4106                 .rpc_cred = cred,
4107         };
4108         int status;
4109
4110         /* nfs_client_id4 */
4111         nfs4_init_boot_verifier(clp, &sc_verifier);
4112         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4113                 setclientid.sc_name_len =
4114                                 nfs4_init_uniform_client_string(clp,
4115                                                 setclientid.sc_name,
4116                                                 sizeof(setclientid.sc_name));
4117         else
4118                 setclientid.sc_name_len =
4119                                 nfs4_init_nonuniform_client_string(clp,
4120                                                 setclientid.sc_name,
4121                                                 sizeof(setclientid.sc_name));
4122         /* cb_client4 */
4123         rcu_read_lock();
4124         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4125                                 sizeof(setclientid.sc_netid),
4126                                 rpc_peeraddr2str(clp->cl_rpcclient,
4127                                                         RPC_DISPLAY_NETID));
4128         rcu_read_unlock();
4129         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4130                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4131                                 clp->cl_ipaddr, port >> 8, port & 255);
4132
4133         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4134                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4135                 setclientid.sc_name_len, setclientid.sc_name);
4136         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4137         dprintk("NFS reply setclientid: %d\n", status);
4138         return status;
4139 }
4140
4141 /**
4142  * nfs4_proc_setclientid_confirm - Confirm client ID
4143  * @clp: state data structure
4144  * @res: result of a previous SETCLIENTID
4145  * @cred: RPC credential to use for this call
4146  *
4147  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4148  */
4149 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4150                 struct nfs4_setclientid_res *arg,
4151                 struct rpc_cred *cred)
4152 {
4153         struct nfs_fsinfo fsinfo;
4154         struct rpc_message msg = {
4155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4156                 .rpc_argp = arg,
4157                 .rpc_resp = &fsinfo,
4158                 .rpc_cred = cred,
4159         };
4160         unsigned long now;
4161         int status;
4162
4163         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4164                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4165                 clp->cl_clientid);
4166         now = jiffies;
4167         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4168         if (status == 0) {
4169                 spin_lock(&clp->cl_lock);
4170                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4171                 clp->cl_last_renewal = now;
4172                 spin_unlock(&clp->cl_lock);
4173         }
4174         dprintk("NFS reply setclientid_confirm: %d\n", status);
4175         return status;
4176 }
4177
4178 struct nfs4_delegreturndata {
4179         struct nfs4_delegreturnargs args;
4180         struct nfs4_delegreturnres res;
4181         struct nfs_fh fh;
4182         nfs4_stateid stateid;
4183         unsigned long timestamp;
4184         struct nfs_fattr fattr;
4185         int rpc_status;
4186 };
4187
4188 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4189 {
4190         struct nfs4_delegreturndata *data = calldata;
4191
4192         if (!nfs4_sequence_done(task, &data->res.seq_res))
4193                 return;
4194
4195         switch (task->tk_status) {
4196         case -NFS4ERR_STALE_STATEID:
4197         case -NFS4ERR_EXPIRED:
4198         case 0:
4199                 renew_lease(data->res.server, data->timestamp);
4200                 break;
4201         default:
4202                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4203                                 -EAGAIN) {
4204                         rpc_restart_call_prepare(task);
4205                         return;
4206                 }
4207         }
4208         data->rpc_status = task->tk_status;
4209 }
4210
4211 static void nfs4_delegreturn_release(void *calldata)
4212 {
4213         kfree(calldata);
4214 }
4215
4216 #if defined(CONFIG_NFS_V4_1)
4217 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4218 {
4219         struct nfs4_delegreturndata *d_data;
4220
4221         d_data = (struct nfs4_delegreturndata *)data;
4222
4223         nfs4_setup_sequence(d_data->res.server,
4224                         &d_data->args.seq_args,
4225                         &d_data->res.seq_res,
4226                         task);
4227 }
4228 #endif /* CONFIG_NFS_V4_1 */
4229
4230 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4231 #if defined(CONFIG_NFS_V4_1)
4232         .rpc_call_prepare = nfs4_delegreturn_prepare,
4233 #endif /* CONFIG_NFS_V4_1 */
4234         .rpc_call_done = nfs4_delegreturn_done,
4235         .rpc_release = nfs4_delegreturn_release,
4236 };
4237
4238 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4239 {
4240         struct nfs4_delegreturndata *data;
4241         struct nfs_server *server = NFS_SERVER(inode);
4242         struct rpc_task *task;
4243         struct rpc_message msg = {
4244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4245                 .rpc_cred = cred,
4246         };
4247         struct rpc_task_setup task_setup_data = {
4248                 .rpc_client = server->client,
4249                 .rpc_message = &msg,
4250                 .callback_ops = &nfs4_delegreturn_ops,
4251                 .flags = RPC_TASK_ASYNC,
4252         };
4253         int status = 0;
4254
4255         data = kzalloc(sizeof(*data), GFP_NOFS);
4256         if (data == NULL)
4257                 return -ENOMEM;
4258         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4259         data->args.fhandle = &data->fh;
4260         data->args.stateid = &data->stateid;
4261         data->args.bitmask = server->cache_consistency_bitmask;
4262         nfs_copy_fh(&data->fh, NFS_FH(inode));
4263         nfs4_stateid_copy(&data->stateid, stateid);
4264         data->res.fattr = &data->fattr;
4265         data->res.server = server;
4266         nfs_fattr_init(data->res.fattr);
4267         data->timestamp = jiffies;
4268         data->rpc_status = 0;
4269
4270         task_setup_data.callback_data = data;
4271         msg.rpc_argp = &data->args;
4272         msg.rpc_resp = &data->res;
4273         task = rpc_run_task(&task_setup_data);
4274         if (IS_ERR(task))
4275                 return PTR_ERR(task);
4276         if (!issync)
4277                 goto out;
4278         status = nfs4_wait_for_completion_rpc_task(task);
4279         if (status != 0)
4280                 goto out;
4281         status = data->rpc_status;
4282         if (status == 0)
4283                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4284         else
4285                 nfs_refresh_inode(inode, &data->fattr);
4286 out:
4287         rpc_put_task(task);
4288         return status;
4289 }
4290
4291 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4292 {
4293         struct nfs_server *server = NFS_SERVER(inode);
4294         struct nfs4_exception exception = { };
4295         int err;
4296         do {
4297                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4298                 switch (err) {
4299                         case -NFS4ERR_STALE_STATEID:
4300                         case -NFS4ERR_EXPIRED:
4301                         case 0:
4302                                 return 0;
4303                 }
4304                 err = nfs4_handle_exception(server, err, &exception);
4305         } while (exception.retry);
4306         return err;
4307 }
4308
4309 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4310 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4311
4312 /*
4313  * sleep, with exponential backoff, and retry the LOCK operation.
4314  */
4315 static unsigned long
4316 nfs4_set_lock_task_retry(unsigned long timeout)
4317 {
4318         freezable_schedule_timeout_killable(timeout);
4319         timeout <<= 1;
4320         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4321                 return NFS4_LOCK_MAXTIMEOUT;
4322         return timeout;
4323 }
4324
4325 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4326 {
4327         struct inode *inode = state->inode;
4328         struct nfs_server *server = NFS_SERVER(inode);
4329         struct nfs_client *clp = server->nfs_client;
4330         struct nfs_lockt_args arg = {
4331                 .fh = NFS_FH(inode),
4332                 .fl = request,
4333         };
4334         struct nfs_lockt_res res = {
4335                 .denied = request,
4336         };
4337         struct rpc_message msg = {
4338                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4339                 .rpc_argp       = &arg,
4340                 .rpc_resp       = &res,
4341                 .rpc_cred       = state->owner->so_cred,
4342         };
4343         struct nfs4_lock_state *lsp;
4344         int status;
4345
4346         arg.lock_owner.clientid = clp->cl_clientid;
4347         status = nfs4_set_lock_state(state, request);
4348         if (status != 0)
4349                 goto out;
4350         lsp = request->fl_u.nfs4_fl.owner;
4351         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4352         arg.lock_owner.s_dev = server->s_dev;
4353         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4354         switch (status) {
4355                 case 0:
4356                         request->fl_type = F_UNLCK;
4357                         break;
4358                 case -NFS4ERR_DENIED:
4359                         status = 0;
4360         }
4361         request->fl_ops->fl_release_private(request);
4362 out:
4363         return status;
4364 }
4365
4366 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4367 {
4368         struct nfs4_exception exception = { };
4369         int err;
4370
4371         do {
4372                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4373                                 _nfs4_proc_getlk(state, cmd, request),
4374                                 &exception);
4375         } while (exception.retry);
4376         return err;
4377 }
4378
4379 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4380 {
4381         int res = 0;
4382         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4383                 case FL_POSIX:
4384                         res = posix_lock_file_wait(file, fl);
4385                         break;
4386                 case FL_FLOCK:
4387                         res = flock_lock_file_wait(file, fl);
4388                         break;
4389                 default:
4390                         BUG();
4391         }
4392         return res;
4393 }
4394
4395 struct nfs4_unlockdata {
4396         struct nfs_locku_args arg;
4397         struct nfs_locku_res res;
4398         struct nfs4_lock_state *lsp;
4399         struct nfs_open_context *ctx;
4400         struct file_lock fl;
4401         const struct nfs_server *server;
4402         unsigned long timestamp;
4403 };
4404
4405 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4406                 struct nfs_open_context *ctx,
4407                 struct nfs4_lock_state *lsp,
4408                 struct nfs_seqid *seqid)
4409 {
4410         struct nfs4_unlockdata *p;
4411         struct inode *inode = lsp->ls_state->inode;
4412
4413         p = kzalloc(sizeof(*p), GFP_NOFS);
4414         if (p == NULL)
4415                 return NULL;
4416         p->arg.fh = NFS_FH(inode);
4417         p->arg.fl = &p->fl;
4418         p->arg.seqid = seqid;
4419         p->res.seqid = seqid;
4420         p->arg.stateid = &lsp->ls_stateid;
4421         p->lsp = lsp;
4422         atomic_inc(&lsp->ls_count);
4423         /* Ensure we don't close file until we're done freeing locks! */
4424         p->ctx = get_nfs_open_context(ctx);
4425         memcpy(&p->fl, fl, sizeof(p->fl));
4426         p->server = NFS_SERVER(inode);
4427         return p;
4428 }
4429
4430 static void nfs4_locku_release_calldata(void *data)
4431 {
4432         struct nfs4_unlockdata *calldata = data;
4433         nfs_free_seqid(calldata->arg.seqid);
4434         nfs4_put_lock_state(calldata->lsp);
4435         put_nfs_open_context(calldata->ctx);
4436         kfree(calldata);
4437 }
4438
4439 static void nfs4_locku_done(struct rpc_task *task, void *data)
4440 {
4441         struct nfs4_unlockdata *calldata = data;
4442
4443         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4444                 return;
4445         switch (task->tk_status) {
4446                 case 0:
4447                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4448                                         &calldata->res.stateid);
4449                         renew_lease(calldata->server, calldata->timestamp);
4450                         break;
4451                 case -NFS4ERR_BAD_STATEID:
4452                 case -NFS4ERR_OLD_STATEID:
4453                 case -NFS4ERR_STALE_STATEID:
4454                 case -NFS4ERR_EXPIRED:
4455                         break;
4456                 default:
4457                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4458                                 rpc_restart_call_prepare(task);
4459         }
4460         nfs_release_seqid(calldata->arg.seqid);
4461 }
4462
4463 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4464 {
4465         struct nfs4_unlockdata *calldata = data;
4466
4467         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4468                 goto out_wait;
4469         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4470                 /* Note: exit _without_ running nfs4_locku_done */
4471                 goto out_no_action;
4472         }
4473         calldata->timestamp = jiffies;
4474         if (nfs4_setup_sequence(calldata->server,
4475                                 &calldata->arg.seq_args,
4476                                 &calldata->res.seq_res,
4477                                 task) != 0)
4478                 nfs_release_seqid(calldata->arg.seqid);
4479         return;
4480 out_no_action:
4481         task->tk_action = NULL;
4482 out_wait:
4483         nfs4_sequence_done(task, &calldata->res.seq_res);
4484 }
4485
4486 static const struct rpc_call_ops nfs4_locku_ops = {
4487         .rpc_call_prepare = nfs4_locku_prepare,
4488         .rpc_call_done = nfs4_locku_done,
4489         .rpc_release = nfs4_locku_release_calldata,
4490 };
4491
4492 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4493                 struct nfs_open_context *ctx,
4494                 struct nfs4_lock_state *lsp,
4495                 struct nfs_seqid *seqid)
4496 {
4497         struct nfs4_unlockdata *data;
4498         struct rpc_message msg = {
4499                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4500                 .rpc_cred = ctx->cred,
4501         };
4502         struct rpc_task_setup task_setup_data = {
4503                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4504                 .rpc_message = &msg,
4505                 .callback_ops = &nfs4_locku_ops,
4506                 .workqueue = nfsiod_workqueue,
4507                 .flags = RPC_TASK_ASYNC,
4508         };
4509
4510         /* Ensure this is an unlock - when canceling a lock, the
4511          * canceled lock is passed in, and it won't be an unlock.
4512          */
4513         fl->fl_type = F_UNLCK;
4514
4515         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4516         if (data == NULL) {
4517                 nfs_free_seqid(seqid);
4518                 return ERR_PTR(-ENOMEM);
4519         }
4520
4521         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4522         msg.rpc_argp = &data->arg;
4523         msg.rpc_resp = &data->res;
4524         task_setup_data.callback_data = data;
4525         return rpc_run_task(&task_setup_data);
4526 }
4527
4528 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4529 {
4530         struct inode *inode = state->inode;
4531         struct nfs4_state_owner *sp = state->owner;
4532         struct nfs_inode *nfsi = NFS_I(inode);
4533         struct nfs_seqid *seqid;
4534         struct nfs4_lock_state *lsp;
4535         struct rpc_task *task;
4536         int status = 0;
4537         unsigned char fl_flags = request->fl_flags;
4538
4539         status = nfs4_set_lock_state(state, request);
4540         /* Unlock _before_ we do the RPC call */
4541         request->fl_flags |= FL_EXISTS;
4542         /* Exclude nfs_delegation_claim_locks() */
4543         mutex_lock(&sp->so_delegreturn_mutex);
4544         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4545         down_read(&nfsi->rwsem);
4546         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4547                 up_read(&nfsi->rwsem);
4548                 mutex_unlock(&sp->so_delegreturn_mutex);
4549                 goto out;
4550         }
4551         up_read(&nfsi->rwsem);
4552         mutex_unlock(&sp->so_delegreturn_mutex);
4553         if (status != 0)
4554                 goto out;
4555         /* Is this a delegated lock? */
4556         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4557                 goto out;
4558         lsp = request->fl_u.nfs4_fl.owner;
4559         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4560         status = -ENOMEM;
4561         if (seqid == NULL)
4562                 goto out;
4563         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4564         status = PTR_ERR(task);
4565         if (IS_ERR(task))
4566                 goto out;
4567         status = nfs4_wait_for_completion_rpc_task(task);
4568         rpc_put_task(task);
4569 out:
4570         request->fl_flags = fl_flags;
4571         return status;
4572 }
4573
4574 struct nfs4_lockdata {
4575         struct nfs_lock_args arg;
4576         struct nfs_lock_res res;
4577         struct nfs4_lock_state *lsp;
4578         struct nfs_open_context *ctx;
4579         struct file_lock fl;
4580         unsigned long timestamp;
4581         int rpc_status;
4582         int cancelled;
4583         struct nfs_server *server;
4584 };
4585
4586 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4587                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4588                 gfp_t gfp_mask)
4589 {
4590         struct nfs4_lockdata *p;
4591         struct inode *inode = lsp->ls_state->inode;
4592         struct nfs_server *server = NFS_SERVER(inode);
4593
4594         p = kzalloc(sizeof(*p), gfp_mask);
4595         if (p == NULL)
4596                 return NULL;
4597
4598         p->arg.fh = NFS_FH(inode);
4599         p->arg.fl = &p->fl;
4600         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4601         if (p->arg.open_seqid == NULL)
4602                 goto out_free;
4603         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4604         if (p->arg.lock_seqid == NULL)
4605                 goto out_free_seqid;
4606         p->arg.lock_stateid = &lsp->ls_stateid;
4607         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4608         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4609         p->arg.lock_owner.s_dev = server->s_dev;
4610         p->res.lock_seqid = p->arg.lock_seqid;
4611         p->lsp = lsp;
4612         p->server = server;
4613         atomic_inc(&lsp->ls_count);
4614         p->ctx = get_nfs_open_context(ctx);
4615         memcpy(&p->fl, fl, sizeof(p->fl));
4616         return p;
4617 out_free_seqid:
4618         nfs_free_seqid(p->arg.open_seqid);
4619 out_free:
4620         kfree(p);
4621         return NULL;
4622 }
4623
4624 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4625 {
4626         struct nfs4_lockdata *data = calldata;
4627         struct nfs4_state *state = data->lsp->ls_state;
4628
4629         dprintk("%s: begin!\n", __func__);
4630         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4631                 goto out_wait;
4632         /* Do we need to do an open_to_lock_owner? */
4633         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4634                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4635                         goto out_release_lock_seqid;
4636                 }
4637                 data->arg.open_stateid = &state->stateid;
4638                 data->arg.new_lock_owner = 1;
4639                 data->res.open_seqid = data->arg.open_seqid;
4640         } else
4641                 data->arg.new_lock_owner = 0;
4642         data->timestamp = jiffies;
4643         if (nfs4_setup_sequence(data->server,
4644                                 &data->arg.seq_args,
4645                                 &data->res.seq_res,
4646                                 task) == 0)
4647                 return;
4648         nfs_release_seqid(data->arg.open_seqid);
4649 out_release_lock_seqid:
4650         nfs_release_seqid(data->arg.lock_seqid);
4651 out_wait:
4652         nfs4_sequence_done(task, &data->res.seq_res);
4653         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4654 }
4655
4656 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4657 {
4658         struct nfs4_lockdata *data = calldata;
4659
4660         dprintk("%s: begin!\n", __func__);
4661
4662         if (!nfs4_sequence_done(task, &data->res.seq_res))
4663                 return;
4664
4665         data->rpc_status = task->tk_status;
4666         if (data->arg.new_lock_owner != 0) {
4667                 if (data->rpc_status == 0)
4668                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4669                 else
4670                         goto out;
4671         }
4672         if (data->rpc_status == 0) {
4673                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4674                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4675                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4676         }
4677 out:
4678         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4679 }
4680
4681 static void nfs4_lock_release(void *calldata)
4682 {
4683         struct nfs4_lockdata *data = calldata;
4684
4685         dprintk("%s: begin!\n", __func__);
4686         nfs_free_seqid(data->arg.open_seqid);
4687         if (data->cancelled != 0) {
4688                 struct rpc_task *task;
4689                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4690                                 data->arg.lock_seqid);
4691                 if (!IS_ERR(task))
4692                         rpc_put_task_async(task);
4693                 dprintk("%s: cancelling lock!\n", __func__);
4694         } else
4695                 nfs_free_seqid(data->arg.lock_seqid);
4696         nfs4_put_lock_state(data->lsp);
4697         put_nfs_open_context(data->ctx);
4698         kfree(data);
4699         dprintk("%s: done!\n", __func__);
4700 }
4701
4702 static const struct rpc_call_ops nfs4_lock_ops = {
4703         .rpc_call_prepare = nfs4_lock_prepare,
4704         .rpc_call_done = nfs4_lock_done,
4705         .rpc_release = nfs4_lock_release,
4706 };
4707
4708 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4709 {
4710         switch (error) {
4711         case -NFS4ERR_ADMIN_REVOKED:
4712         case -NFS4ERR_BAD_STATEID:
4713                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4714                 if (new_lock_owner != 0 ||
4715                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4716                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4717                 break;
4718         case -NFS4ERR_STALE_STATEID:
4719                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4720         case -NFS4ERR_EXPIRED:
4721                 nfs4_schedule_lease_recovery(server->nfs_client);
4722         };
4723 }
4724
4725 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4726 {
4727         struct nfs4_lockdata *data;
4728         struct rpc_task *task;
4729         struct rpc_message msg = {
4730                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4731                 .rpc_cred = state->owner->so_cred,
4732         };
4733         struct rpc_task_setup task_setup_data = {
4734                 .rpc_client = NFS_CLIENT(state->inode),
4735                 .rpc_message = &msg,
4736                 .callback_ops = &nfs4_lock_ops,
4737                 .workqueue = nfsiod_workqueue,
4738                 .flags = RPC_TASK_ASYNC,
4739         };
4740         int ret;
4741
4742         dprintk("%s: begin!\n", __func__);
4743         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4744                         fl->fl_u.nfs4_fl.owner,
4745                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4746         if (data == NULL)
4747                 return -ENOMEM;
4748         if (IS_SETLKW(cmd))
4749                 data->arg.block = 1;
4750         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4751         msg.rpc_argp = &data->arg;
4752         msg.rpc_resp = &data->res;
4753         task_setup_data.callback_data = data;
4754         if (recovery_type > NFS_LOCK_NEW) {
4755                 if (recovery_type == NFS_LOCK_RECLAIM)
4756                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4757                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4758         }
4759         task = rpc_run_task(&task_setup_data);
4760         if (IS_ERR(task))
4761                 return PTR_ERR(task);
4762         ret = nfs4_wait_for_completion_rpc_task(task);
4763         if (ret == 0) {
4764                 ret = data->rpc_status;
4765                 if (ret)
4766                         nfs4_handle_setlk_error(data->server, data->lsp,
4767                                         data->arg.new_lock_owner, ret);
4768         } else
4769                 data->cancelled = 1;
4770         rpc_put_task(task);
4771         dprintk("%s: done, ret = %d!\n", __func__, ret);
4772         return ret;
4773 }
4774
4775 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4776 {
4777         struct nfs_server *server = NFS_SERVER(state->inode);
4778         struct nfs4_exception exception = {
4779                 .inode = state->inode,
4780         };
4781         int err;
4782
4783         do {
4784                 /* Cache the lock if possible... */
4785                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4786                         return 0;
4787                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4788                 if (err != -NFS4ERR_DELAY)
4789                         break;
4790                 nfs4_handle_exception(server, err, &exception);
4791         } while (exception.retry);
4792         return err;
4793 }
4794
4795 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4796 {
4797         struct nfs_server *server = NFS_SERVER(state->inode);
4798         struct nfs4_exception exception = {
4799                 .inode = state->inode,
4800         };
4801         int err;
4802
4803         err = nfs4_set_lock_state(state, request);
4804         if (err != 0)
4805                 return err;
4806         do {
4807                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4808                         return 0;
4809                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4810                 switch (err) {
4811                 default:
4812                         goto out;
4813                 case -NFS4ERR_GRACE:
4814                 case -NFS4ERR_DELAY:
4815                         nfs4_handle_exception(server, err, &exception);
4816                         err = 0;
4817                 }
4818         } while (exception.retry);
4819 out:
4820         return err;
4821 }
4822
4823 #if defined(CONFIG_NFS_V4_1)
4824 /**
4825  * nfs41_check_expired_locks - possibly free a lock stateid
4826  *
4827  * @state: NFSv4 state for an inode
4828  *
4829  * Returns NFS_OK if recovery for this stateid is now finished.
4830  * Otherwise a negative NFS4ERR value is returned.
4831  */
4832 static int nfs41_check_expired_locks(struct nfs4_state *state)
4833 {
4834         int status, ret = -NFS4ERR_BAD_STATEID;
4835         struct nfs4_lock_state *lsp;
4836         struct nfs_server *server = NFS_SERVER(state->inode);
4837
4838         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4839                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4840                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4841                         if (status != NFS_OK) {
4842                                 /* Free the stateid unless the server
4843                                  * informs us the stateid is unrecognized. */
4844                                 if (status != -NFS4ERR_BAD_STATEID)
4845                                         nfs41_free_stateid(server,
4846                                                         &lsp->ls_stateid);
4847                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4848                                 ret = status;
4849                         }
4850                 }
4851         };
4852
4853         return ret;
4854 }
4855
4856 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4857 {
4858         int status = NFS_OK;
4859
4860         if (test_bit(LK_STATE_IN_USE, &state->flags))
4861                 status = nfs41_check_expired_locks(state);
4862         if (status != NFS_OK)
4863                 status = nfs4_lock_expired(state, request);
4864         return status;
4865 }
4866 #endif
4867
4868 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4869 {
4870         struct nfs4_state_owner *sp = state->owner;
4871         struct nfs_inode *nfsi = NFS_I(state->inode);
4872         unsigned char fl_flags = request->fl_flags;
4873         unsigned int seq;
4874         int status = -ENOLCK;
4875
4876         if ((fl_flags & FL_POSIX) &&
4877                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4878                 goto out;
4879         /* Is this a delegated open? */
4880         status = nfs4_set_lock_state(state, request);
4881         if (status != 0)
4882                 goto out;
4883         request->fl_flags |= FL_ACCESS;
4884         status = do_vfs_lock(request->fl_file, request);
4885         if (status < 0)
4886                 goto out;
4887         down_read(&nfsi->rwsem);
4888         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4889                 /* Yes: cache locks! */
4890                 /* ...but avoid races with delegation recall... */
4891                 request->fl_flags = fl_flags & ~FL_SLEEP;
4892                 status = do_vfs_lock(request->fl_file, request);
4893                 goto out_unlock;
4894         }
4895         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
4896         up_read(&nfsi->rwsem);
4897         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4898         if (status != 0)
4899                 goto out;
4900         down_read(&nfsi->rwsem);
4901         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
4902                 status = -NFS4ERR_DELAY;
4903                 goto out_unlock;
4904         }
4905         /* Note: we always want to sleep here! */
4906         request->fl_flags = fl_flags | FL_SLEEP;
4907         if (do_vfs_lock(request->fl_file, request) < 0)
4908                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4909                         "manager!\n", __func__);
4910 out_unlock:
4911         up_read(&nfsi->rwsem);
4912 out:
4913         request->fl_flags = fl_flags;
4914         return status;
4915 }
4916
4917 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4918 {
4919         struct nfs4_exception exception = {
4920                 .state = state,
4921                 .inode = state->inode,
4922         };
4923         int err;
4924
4925         do {
4926                 err = _nfs4_proc_setlk(state, cmd, request);
4927                 if (err == -NFS4ERR_DENIED)
4928                         err = -EAGAIN;
4929                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4930                                 err, &exception);
4931         } while (exception.retry);
4932         return err;
4933 }
4934
4935 static int
4936 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4937 {
4938         struct nfs_open_context *ctx;
4939         struct nfs4_state *state;
4940         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4941         int status;
4942
4943         /* verify open state */
4944         ctx = nfs_file_open_context(filp);
4945         state = ctx->state;
4946
4947         if (request->fl_start < 0 || request->fl_end < 0)
4948                 return -EINVAL;
4949
4950         if (IS_GETLK(cmd)) {
4951                 if (state != NULL)
4952                         return nfs4_proc_getlk(state, F_GETLK, request);
4953                 return 0;
4954         }
4955
4956         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4957                 return -EINVAL;
4958
4959         if (request->fl_type == F_UNLCK) {
4960                 if (state != NULL)
4961                         return nfs4_proc_unlck(state, cmd, request);
4962                 return 0;
4963         }
4964
4965         if (state == NULL)
4966                 return -ENOLCK;
4967         /*
4968          * Don't rely on the VFS having checked the file open mode,
4969          * since it won't do this for flock() locks.
4970          */
4971         switch (request->fl_type) {
4972         case F_RDLCK:
4973                 if (!(filp->f_mode & FMODE_READ))
4974                         return -EBADF;
4975                 break;
4976         case F_WRLCK:
4977                 if (!(filp->f_mode & FMODE_WRITE))
4978                         return -EBADF;
4979         }
4980
4981         do {
4982                 status = nfs4_proc_setlk(state, cmd, request);
4983                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4984                         break;
4985                 timeout = nfs4_set_lock_task_retry(timeout);
4986                 status = -ERESTARTSYS;
4987                 if (signalled())
4988                         break;
4989         } while(status < 0);
4990         return status;
4991 }
4992
4993 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4994 {
4995         struct nfs_server *server = NFS_SERVER(state->inode);
4996         struct nfs4_exception exception = { };
4997         int err;
4998
4999         err = nfs4_set_lock_state(state, fl);
5000         if (err != 0)
5001                 goto out;
5002         do {
5003                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5004                 switch (err) {
5005                         default:
5006                                 printk(KERN_ERR "NFS: %s: unhandled error "
5007                                         "%d.\n", __func__, err);
5008                         case 0:
5009                         case -ESTALE:
5010                                 goto out;
5011                         case -NFS4ERR_STALE_CLIENTID:
5012                         case -NFS4ERR_STALE_STATEID:
5013                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5014                         case -NFS4ERR_EXPIRED:
5015                                 nfs4_schedule_lease_recovery(server->nfs_client);
5016                                 err = -EAGAIN;
5017                                 goto out;
5018                         case -NFS4ERR_BADSESSION:
5019                         case -NFS4ERR_BADSLOT:
5020                         case -NFS4ERR_BAD_HIGH_SLOT:
5021                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5022                         case -NFS4ERR_DEADSESSION:
5023                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5024                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5025                                 err = -EAGAIN;
5026                                 goto out;
5027                         case -NFS4ERR_DELEG_REVOKED:
5028                         case -NFS4ERR_ADMIN_REVOKED:
5029                         case -NFS4ERR_BAD_STATEID:
5030                         case -NFS4ERR_OPENMODE:
5031                                 nfs4_schedule_stateid_recovery(server, state);
5032                                 err = 0;
5033                                 goto out;
5034                         case -NFS4ERR_DELAY:
5035                         case -NFS4ERR_GRACE:
5036                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5037                                 ssleep(1);
5038                                 err = -EAGAIN;
5039                                 goto out;
5040                         case -ENOMEM:
5041                         case -NFS4ERR_DENIED:
5042                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5043                                 err = 0;
5044                                 goto out;
5045                 }
5046                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5047                 err = nfs4_handle_exception(server, err, &exception);
5048         } while (exception.retry);
5049 out:
5050         return err;
5051 }
5052
5053 struct nfs_release_lockowner_data {
5054         struct nfs4_lock_state *lsp;
5055         struct nfs_server *server;
5056         struct nfs_release_lockowner_args args;
5057 };
5058
5059 static void nfs4_release_lockowner_release(void *calldata)
5060 {
5061         struct nfs_release_lockowner_data *data = calldata;
5062         nfs4_free_lock_state(data->server, data->lsp);
5063         kfree(calldata);
5064 }
5065
5066 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5067         .rpc_release = nfs4_release_lockowner_release,
5068 };
5069
5070 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5071 {
5072         struct nfs_server *server = lsp->ls_state->owner->so_server;
5073         struct nfs_release_lockowner_data *data;
5074         struct rpc_message msg = {
5075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5076         };
5077
5078         if (server->nfs_client->cl_mvops->minor_version != 0)
5079                 return -EINVAL;
5080         data = kmalloc(sizeof(*data), GFP_NOFS);
5081         if (!data)
5082                 return -ENOMEM;
5083         data->lsp = lsp;
5084         data->server = server;
5085         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5086         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5087         data->args.lock_owner.s_dev = server->s_dev;
5088         msg.rpc_argp = &data->args;
5089         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5090         return 0;
5091 }
5092
5093 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5094
5095 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5096                                    const void *buf, size_t buflen,
5097                                    int flags, int type)
5098 {
5099         if (strcmp(key, "") != 0)
5100                 return -EINVAL;
5101
5102         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5103 }
5104
5105 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5106                                    void *buf, size_t buflen, int type)
5107 {
5108         if (strcmp(key, "") != 0)
5109                 return -EINVAL;
5110
5111         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5112 }
5113
5114 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5115                                        size_t list_len, const char *name,
5116                                        size_t name_len, int type)
5117 {
5118         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5119
5120         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5121                 return 0;
5122
5123         if (list && len <= list_len)
5124                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5125         return len;
5126 }
5127
5128 /*
5129  * nfs_fhget will use either the mounted_on_fileid or the fileid
5130  */
5131 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5132 {
5133         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5134                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5135               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5136               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5137                 return;
5138
5139         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5140                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5141         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5142         fattr->nlink = 2;
5143 }
5144
5145 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5146                                    const struct qstr *name,
5147                                    struct nfs4_fs_locations *fs_locations,
5148                                    struct page *page)
5149 {
5150         struct nfs_server *server = NFS_SERVER(dir);
5151         u32 bitmask[2] = {
5152                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5153         };
5154         struct nfs4_fs_locations_arg args = {
5155                 .dir_fh = NFS_FH(dir),
5156                 .name = name,
5157                 .page = page,
5158                 .bitmask = bitmask,
5159         };
5160         struct nfs4_fs_locations_res res = {
5161                 .fs_locations = fs_locations,
5162         };
5163         struct rpc_message msg = {
5164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5165                 .rpc_argp = &args,
5166                 .rpc_resp = &res,
5167         };
5168         int status;
5169
5170         dprintk("%s: start\n", __func__);
5171
5172         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5173          * is not supported */
5174         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5175                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5176         else
5177                 bitmask[0] |= FATTR4_WORD0_FILEID;
5178
5179         nfs_fattr_init(&fs_locations->fattr);
5180         fs_locations->server = server;
5181         fs_locations->nlocations = 0;
5182         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5183         dprintk("%s: returned status = %d\n", __func__, status);
5184         return status;
5185 }
5186
5187 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5188                            const struct qstr *name,
5189                            struct nfs4_fs_locations *fs_locations,
5190                            struct page *page)
5191 {
5192         struct nfs4_exception exception = { };
5193         int err;
5194         do {
5195                 err = nfs4_handle_exception(NFS_SERVER(dir),
5196                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5197                                 &exception);
5198         } while (exception.retry);
5199         return err;
5200 }
5201
5202 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5203 {
5204         int status;
5205         struct nfs4_secinfo_arg args = {
5206                 .dir_fh = NFS_FH(dir),
5207                 .name   = name,
5208         };
5209         struct nfs4_secinfo_res res = {
5210                 .flavors     = flavors,
5211         };
5212         struct rpc_message msg = {
5213                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5214                 .rpc_argp = &args,
5215                 .rpc_resp = &res,
5216         };
5217
5218         dprintk("NFS call  secinfo %s\n", name->name);
5219         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5220         dprintk("NFS reply  secinfo: %d\n", status);
5221         return status;
5222 }
5223
5224 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5225                       struct nfs4_secinfo_flavors *flavors)
5226 {
5227         struct nfs4_exception exception = { };
5228         int err;
5229         do {
5230                 err = nfs4_handle_exception(NFS_SERVER(dir),
5231                                 _nfs4_proc_secinfo(dir, name, flavors),
5232                                 &exception);
5233         } while (exception.retry);
5234         return err;
5235 }
5236
5237 #ifdef CONFIG_NFS_V4_1
5238 /*
5239  * Check the exchange flags returned by the server for invalid flags, having
5240  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5241  * DS flags set.
5242  */
5243 static int nfs4_check_cl_exchange_flags(u32 flags)
5244 {
5245         if (flags & ~EXCHGID4_FLAG_MASK_R)
5246                 goto out_inval;
5247         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5248             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5249                 goto out_inval;
5250         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5251                 goto out_inval;
5252         return NFS_OK;
5253 out_inval:
5254         return -NFS4ERR_INVAL;
5255 }
5256
5257 static bool
5258 nfs41_same_server_scope(struct nfs41_server_scope *a,
5259                         struct nfs41_server_scope *b)
5260 {
5261         if (a->server_scope_sz == b->server_scope_sz &&
5262             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5263                 return true;
5264
5265         return false;
5266 }
5267
5268 /*
5269  * nfs4_proc_bind_conn_to_session()
5270  *
5271  * The 4.1 client currently uses the same TCP connection for the
5272  * fore and backchannel.
5273  */
5274 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5275 {
5276         int status;
5277         struct nfs41_bind_conn_to_session_res res;
5278         struct rpc_message msg = {
5279                 .rpc_proc =
5280                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5281                 .rpc_argp = clp,
5282                 .rpc_resp = &res,
5283                 .rpc_cred = cred,
5284         };
5285
5286         dprintk("--> %s\n", __func__);
5287
5288         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5289         if (unlikely(res.session == NULL)) {
5290                 status = -ENOMEM;
5291                 goto out;
5292         }
5293
5294         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5295         if (status == 0) {
5296                 if (memcmp(res.session->sess_id.data,
5297                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5298                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5299                         status = -EIO;
5300                         goto out_session;
5301                 }
5302                 if (res.dir != NFS4_CDFS4_BOTH) {
5303                         dprintk("NFS: %s: Unexpected direction from server\n",
5304                                 __func__);
5305                         status = -EIO;
5306                         goto out_session;
5307                 }
5308                 if (res.use_conn_in_rdma_mode) {
5309                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5310                                 __func__);
5311                         status = -EIO;
5312                         goto out_session;
5313                 }
5314         }
5315 out_session:
5316         kfree(res.session);
5317 out:
5318         dprintk("<-- %s status= %d\n", __func__, status);
5319         return status;
5320 }
5321
5322 /*
5323  * nfs4_proc_exchange_id()
5324  *
5325  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5326  *
5327  * Since the clientid has expired, all compounds using sessions
5328  * associated with the stale clientid will be returning
5329  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5330  * be in some phase of session reset.
5331  */
5332 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5333 {
5334         nfs4_verifier verifier;
5335         struct nfs41_exchange_id_args args = {
5336                 .verifier = &verifier,
5337                 .client = clp,
5338                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5339         };
5340         struct nfs41_exchange_id_res res = {
5341                 0
5342         };
5343         int status;
5344         struct rpc_message msg = {
5345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5346                 .rpc_argp = &args,
5347                 .rpc_resp = &res,
5348                 .rpc_cred = cred,
5349         };
5350
5351         nfs4_init_boot_verifier(clp, &verifier);
5352         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5353                                                         sizeof(args.id));
5354         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5355                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5356                 args.id_len, args.id);
5357
5358         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5359                                         GFP_NOFS);
5360         if (unlikely(res.server_owner == NULL)) {
5361                 status = -ENOMEM;
5362                 goto out;
5363         }
5364
5365         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5366                                         GFP_NOFS);
5367         if (unlikely(res.server_scope == NULL)) {
5368                 status = -ENOMEM;
5369                 goto out_server_owner;
5370         }
5371
5372         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5373         if (unlikely(res.impl_id == NULL)) {
5374                 status = -ENOMEM;
5375                 goto out_server_scope;
5376         }
5377
5378         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5379         if (status == 0)
5380                 status = nfs4_check_cl_exchange_flags(res.flags);
5381
5382         if (status == 0) {
5383                 clp->cl_clientid = res.clientid;
5384                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5385                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5386                         clp->cl_seqid = res.seqid;
5387
5388                 kfree(clp->cl_serverowner);
5389                 clp->cl_serverowner = res.server_owner;
5390                 res.server_owner = NULL;
5391
5392                 /* use the most recent implementation id */
5393                 kfree(clp->cl_implid);
5394                 clp->cl_implid = res.impl_id;
5395
5396                 if (clp->cl_serverscope != NULL &&
5397                     !nfs41_same_server_scope(clp->cl_serverscope,
5398                                              res.server_scope)) {
5399                         dprintk("%s: server_scope mismatch detected\n",
5400                                 __func__);
5401                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5402                         kfree(clp->cl_serverscope);
5403                         clp->cl_serverscope = NULL;
5404                 }
5405
5406                 if (clp->cl_serverscope == NULL) {
5407                         clp->cl_serverscope = res.server_scope;
5408                         goto out;
5409                 }
5410         } else
5411                 kfree(res.impl_id);
5412
5413 out_server_owner:
5414         kfree(res.server_owner);
5415 out_server_scope:
5416         kfree(res.server_scope);
5417 out:
5418         if (clp->cl_implid != NULL)
5419                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5420                         "domain: %s, name: %s, date: %llu,%u\n",
5421                         clp->cl_implid->domain, clp->cl_implid->name,
5422                         clp->cl_implid->date.seconds,
5423                         clp->cl_implid->date.nseconds);
5424         dprintk("NFS reply exchange_id: %d\n", status);
5425         return status;
5426 }
5427
5428 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5429                 struct rpc_cred *cred)
5430 {
5431         struct rpc_message msg = {
5432                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5433                 .rpc_argp = clp,
5434                 .rpc_cred = cred,
5435         };
5436         int status;
5437
5438         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5439         if (status)
5440                 dprintk("NFS: Got error %d from the server %s on "
5441                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5442         return status;
5443 }
5444
5445 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5446                 struct rpc_cred *cred)
5447 {
5448         unsigned int loop;
5449         int ret;
5450
5451         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5452                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5453                 switch (ret) {
5454                 case -NFS4ERR_DELAY:
5455                 case -NFS4ERR_CLIENTID_BUSY:
5456                         ssleep(1);
5457                         break;
5458                 default:
5459                         return ret;
5460                 }
5461         }
5462         return 0;
5463 }
5464
5465 int nfs4_destroy_clientid(struct nfs_client *clp)
5466 {
5467         struct rpc_cred *cred;
5468         int ret = 0;
5469
5470         if (clp->cl_mvops->minor_version < 1)
5471                 goto out;
5472         if (clp->cl_exchange_flags == 0)
5473                 goto out;
5474         if (clp->cl_preserve_clid)
5475                 goto out;
5476         cred = nfs4_get_exchange_id_cred(clp);
5477         ret = nfs4_proc_destroy_clientid(clp, cred);
5478         if (cred)
5479                 put_rpccred(cred);
5480         switch (ret) {
5481         case 0:
5482         case -NFS4ERR_STALE_CLIENTID:
5483                 clp->cl_exchange_flags = 0;
5484         }
5485 out:
5486         return ret;
5487 }
5488
5489 struct nfs4_get_lease_time_data {
5490         struct nfs4_get_lease_time_args *args;
5491         struct nfs4_get_lease_time_res *res;
5492         struct nfs_client *clp;
5493 };
5494
5495 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5496                                         void *calldata)
5497 {
5498         struct nfs4_get_lease_time_data *data =
5499                         (struct nfs4_get_lease_time_data *)calldata;
5500
5501         dprintk("--> %s\n", __func__);
5502         /* just setup sequence, do not trigger session recovery
5503            since we're invoked within one */
5504         nfs41_setup_sequence(data->clp->cl_session,
5505                         &data->args->la_seq_args,
5506                         &data->res->lr_seq_res,
5507                         task);
5508         dprintk("<-- %s\n", __func__);
5509 }
5510
5511 /*
5512  * Called from nfs4_state_manager thread for session setup, so don't recover
5513  * from sequence operation or clientid errors.
5514  */
5515 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5516 {
5517         struct nfs4_get_lease_time_data *data =
5518                         (struct nfs4_get_lease_time_data *)calldata;
5519
5520         dprintk("--> %s\n", __func__);
5521         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5522                 return;
5523         switch (task->tk_status) {
5524         case -NFS4ERR_DELAY:
5525         case -NFS4ERR_GRACE:
5526                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5527                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5528                 task->tk_status = 0;
5529                 /* fall through */
5530         case -NFS4ERR_RETRY_UNCACHED_REP:
5531                 rpc_restart_call_prepare(task);
5532                 return;
5533         }
5534         dprintk("<-- %s\n", __func__);
5535 }
5536
5537 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5538         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5539         .rpc_call_done = nfs4_get_lease_time_done,
5540 };
5541
5542 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5543 {
5544         struct rpc_task *task;
5545         struct nfs4_get_lease_time_args args;
5546         struct nfs4_get_lease_time_res res = {
5547                 .lr_fsinfo = fsinfo,
5548         };
5549         struct nfs4_get_lease_time_data data = {
5550                 .args = &args,
5551                 .res = &res,
5552                 .clp = clp,
5553         };
5554         struct rpc_message msg = {
5555                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5556                 .rpc_argp = &args,
5557                 .rpc_resp = &res,
5558         };
5559         struct rpc_task_setup task_setup = {
5560                 .rpc_client = clp->cl_rpcclient,
5561                 .rpc_message = &msg,
5562                 .callback_ops = &nfs4_get_lease_time_ops,
5563                 .callback_data = &data,
5564                 .flags = RPC_TASK_TIMEOUT,
5565         };
5566         int status;
5567
5568         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5569         nfs4_set_sequence_privileged(&args.la_seq_args);
5570         dprintk("--> %s\n", __func__);
5571         task = rpc_run_task(&task_setup);
5572
5573         if (IS_ERR(task))
5574                 status = PTR_ERR(task);
5575         else {
5576                 status = task->tk_status;
5577                 rpc_put_task(task);
5578         }
5579         dprintk("<-- %s return %d\n", __func__, status);
5580
5581         return status;
5582 }
5583
5584 /*
5585  * Initialize the values to be used by the client in CREATE_SESSION
5586  * If nfs4_init_session set the fore channel request and response sizes,
5587  * use them.
5588  *
5589  * Set the back channel max_resp_sz_cached to zero to force the client to
5590  * always set csa_cachethis to FALSE because the current implementation
5591  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5592  */
5593 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5594 {
5595         struct nfs4_session *session = args->client->cl_session;
5596         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5597                      mxresp_sz = session->fc_target_max_resp_sz;
5598
5599         if (mxrqst_sz == 0)
5600                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5601         if (mxresp_sz == 0)
5602                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5603         /* Fore channel attributes */
5604         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5605         args->fc_attrs.max_resp_sz = mxresp_sz;
5606         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5607         args->fc_attrs.max_reqs = max_session_slots;
5608
5609         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5610                 "max_ops=%u max_reqs=%u\n",
5611                 __func__,
5612                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5613                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5614
5615         /* Back channel attributes */
5616         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5617         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5618         args->bc_attrs.max_resp_sz_cached = 0;
5619         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5620         args->bc_attrs.max_reqs = 1;
5621
5622         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5623                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5624                 __func__,
5625                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5626                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5627                 args->bc_attrs.max_reqs);
5628 }
5629
5630 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5631 {
5632         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5633         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5634
5635         if (rcvd->max_resp_sz > sent->max_resp_sz)
5636                 return -EINVAL;
5637         /*
5638          * Our requested max_ops is the minimum we need; we're not
5639          * prepared to break up compounds into smaller pieces than that.
5640          * So, no point even trying to continue if the server won't
5641          * cooperate:
5642          */
5643         if (rcvd->max_ops < sent->max_ops)
5644                 return -EINVAL;
5645         if (rcvd->max_reqs == 0)
5646                 return -EINVAL;
5647         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5648                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5649         return 0;
5650 }
5651
5652 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5653 {
5654         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5655         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5656
5657         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5658                 return -EINVAL;
5659         if (rcvd->max_resp_sz < sent->max_resp_sz)
5660                 return -EINVAL;
5661         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5662                 return -EINVAL;
5663         /* These would render the backchannel useless: */
5664         if (rcvd->max_ops != sent->max_ops)
5665                 return -EINVAL;
5666         if (rcvd->max_reqs != sent->max_reqs)
5667                 return -EINVAL;
5668         return 0;
5669 }
5670
5671 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5672                                      struct nfs4_session *session)
5673 {
5674         int ret;
5675
5676         ret = nfs4_verify_fore_channel_attrs(args, session);
5677         if (ret)
5678                 return ret;
5679         return nfs4_verify_back_channel_attrs(args, session);
5680 }
5681
5682 static int _nfs4_proc_create_session(struct nfs_client *clp,
5683                 struct rpc_cred *cred)
5684 {
5685         struct nfs4_session *session = clp->cl_session;
5686         struct nfs41_create_session_args args = {
5687                 .client = clp,
5688                 .cb_program = NFS4_CALLBACK,
5689         };
5690         struct nfs41_create_session_res res = {
5691                 .client = clp,
5692         };
5693         struct rpc_message msg = {
5694                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5695                 .rpc_argp = &args,
5696                 .rpc_resp = &res,
5697                 .rpc_cred = cred,
5698         };
5699         int status;
5700
5701         nfs4_init_channel_attrs(&args);
5702         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5703
5704         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5705
5706         if (!status) {
5707                 /* Verify the session's negotiated channel_attrs values */
5708                 status = nfs4_verify_channel_attrs(&args, session);
5709                 /* Increment the clientid slot sequence id */
5710                 clp->cl_seqid++;
5711         }
5712
5713         return status;
5714 }
5715
5716 /*
5717  * Issues a CREATE_SESSION operation to the server.
5718  * It is the responsibility of the caller to verify the session is
5719  * expired before calling this routine.
5720  */
5721 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5722 {
5723         int status;
5724         unsigned *ptr;
5725         struct nfs4_session *session = clp->cl_session;
5726
5727         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5728
5729         status = _nfs4_proc_create_session(clp, cred);
5730         if (status)
5731                 goto out;
5732
5733         /* Init or reset the session slot tables */
5734         status = nfs4_setup_session_slot_tables(session);
5735         dprintk("slot table setup returned %d\n", status);
5736         if (status)
5737                 goto out;
5738
5739         ptr = (unsigned *)&session->sess_id.data[0];
5740         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5741                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5742 out:
5743         dprintk("<-- %s\n", __func__);
5744         return status;
5745 }
5746
5747 /*
5748  * Issue the over-the-wire RPC DESTROY_SESSION.
5749  * The caller must serialize access to this routine.
5750  */
5751 int nfs4_proc_destroy_session(struct nfs4_session *session,
5752                 struct rpc_cred *cred)
5753 {
5754         struct rpc_message msg = {
5755                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5756                 .rpc_argp = session,
5757                 .rpc_cred = cred,
5758         };
5759         int status = 0;
5760
5761         dprintk("--> nfs4_proc_destroy_session\n");
5762
5763         /* session is still being setup */
5764         if (session->clp->cl_cons_state != NFS_CS_READY)
5765                 return status;
5766
5767         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5768
5769         if (status)
5770                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5771                         "Session has been destroyed regardless...\n", status);
5772
5773         dprintk("<-- nfs4_proc_destroy_session\n");
5774         return status;
5775 }
5776
5777 /*
5778  * Renew the cl_session lease.
5779  */
5780 struct nfs4_sequence_data {
5781         struct nfs_client *clp;
5782         struct nfs4_sequence_args args;
5783         struct nfs4_sequence_res res;
5784 };
5785
5786 static void nfs41_sequence_release(void *data)
5787 {
5788         struct nfs4_sequence_data *calldata = data;
5789         struct nfs_client *clp = calldata->clp;
5790
5791         if (atomic_read(&clp->cl_count) > 1)
5792                 nfs4_schedule_state_renewal(clp);
5793         nfs_put_client(clp);
5794         kfree(calldata);
5795 }
5796
5797 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5798 {
5799         switch(task->tk_status) {
5800         case -NFS4ERR_DELAY:
5801                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5802                 return -EAGAIN;
5803         default:
5804                 nfs4_schedule_lease_recovery(clp);
5805         }
5806         return 0;
5807 }
5808
5809 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5810 {
5811         struct nfs4_sequence_data *calldata = data;
5812         struct nfs_client *clp = calldata->clp;
5813
5814         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5815                 return;
5816
5817         if (task->tk_status < 0) {
5818                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5819                 if (atomic_read(&clp->cl_count) == 1)
5820                         goto out;
5821
5822                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5823                         rpc_restart_call_prepare(task);
5824                         return;
5825                 }
5826         }
5827         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5828 out:
5829         dprintk("<-- %s\n", __func__);
5830 }
5831
5832 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5833 {
5834         struct nfs4_sequence_data *calldata = data;
5835         struct nfs_client *clp = calldata->clp;
5836         struct nfs4_sequence_args *args;
5837         struct nfs4_sequence_res *res;
5838
5839         args = task->tk_msg.rpc_argp;
5840         res = task->tk_msg.rpc_resp;
5841
5842         nfs41_setup_sequence(clp->cl_session, args, res, task);
5843 }
5844
5845 static const struct rpc_call_ops nfs41_sequence_ops = {
5846         .rpc_call_done = nfs41_sequence_call_done,
5847         .rpc_call_prepare = nfs41_sequence_prepare,
5848         .rpc_release = nfs41_sequence_release,
5849 };
5850
5851 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5852                 struct rpc_cred *cred,
5853                 bool is_privileged)
5854 {
5855         struct nfs4_sequence_data *calldata;
5856         struct rpc_message msg = {
5857                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5858                 .rpc_cred = cred,
5859         };
5860         struct rpc_task_setup task_setup_data = {
5861                 .rpc_client = clp->cl_rpcclient,
5862                 .rpc_message = &msg,
5863                 .callback_ops = &nfs41_sequence_ops,
5864                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5865         };
5866
5867         if (!atomic_inc_not_zero(&clp->cl_count))
5868                 return ERR_PTR(-EIO);
5869         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5870         if (calldata == NULL) {
5871                 nfs_put_client(clp);
5872                 return ERR_PTR(-ENOMEM);
5873         }
5874         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5875         if (is_privileged)
5876                 nfs4_set_sequence_privileged(&calldata->args);
5877         msg.rpc_argp = &calldata->args;
5878         msg.rpc_resp = &calldata->res;
5879         calldata->clp = clp;
5880         task_setup_data.callback_data = calldata;
5881
5882         return rpc_run_task(&task_setup_data);
5883 }
5884
5885 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5886 {
5887         struct rpc_task *task;
5888         int ret = 0;
5889
5890         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5891                 return 0;
5892         task = _nfs41_proc_sequence(clp, cred, false);
5893         if (IS_ERR(task))
5894                 ret = PTR_ERR(task);
5895         else
5896                 rpc_put_task_async(task);
5897         dprintk("<-- %s status=%d\n", __func__, ret);
5898         return ret;
5899 }
5900
5901 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5902 {
5903         struct rpc_task *task;
5904         int ret;
5905
5906         task = _nfs41_proc_sequence(clp, cred, true);
5907         if (IS_ERR(task)) {
5908                 ret = PTR_ERR(task);
5909                 goto out;
5910         }
5911         ret = rpc_wait_for_completion_task(task);
5912         if (!ret) {
5913                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5914
5915                 if (task->tk_status == 0)
5916                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5917                 ret = task->tk_status;
5918         }
5919         rpc_put_task(task);
5920 out:
5921         dprintk("<-- %s status=%d\n", __func__, ret);
5922         return ret;
5923 }
5924
5925 struct nfs4_reclaim_complete_data {
5926         struct nfs_client *clp;
5927         struct nfs41_reclaim_complete_args arg;
5928         struct nfs41_reclaim_complete_res res;
5929 };
5930
5931 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5932 {
5933         struct nfs4_reclaim_complete_data *calldata = data;
5934
5935         nfs41_setup_sequence(calldata->clp->cl_session,
5936                         &calldata->arg.seq_args,
5937                         &calldata->res.seq_res,
5938                         task);
5939 }
5940
5941 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5942 {
5943         switch(task->tk_status) {
5944         case 0:
5945         case -NFS4ERR_COMPLETE_ALREADY:
5946         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5947                 break;
5948         case -NFS4ERR_DELAY:
5949                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5950                 /* fall through */
5951         case -NFS4ERR_RETRY_UNCACHED_REP:
5952                 return -EAGAIN;
5953         default:
5954                 nfs4_schedule_lease_recovery(clp);
5955         }
5956         return 0;
5957 }
5958
5959 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5960 {
5961         struct nfs4_reclaim_complete_data *calldata = data;
5962         struct nfs_client *clp = calldata->clp;
5963         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5964
5965         dprintk("--> %s\n", __func__);
5966         if (!nfs41_sequence_done(task, res))
5967                 return;
5968
5969         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5970                 rpc_restart_call_prepare(task);
5971                 return;
5972         }
5973         dprintk("<-- %s\n", __func__);
5974 }
5975
5976 static void nfs4_free_reclaim_complete_data(void *data)
5977 {
5978         struct nfs4_reclaim_complete_data *calldata = data;
5979
5980         kfree(calldata);
5981 }
5982
5983 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5984         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5985         .rpc_call_done = nfs4_reclaim_complete_done,
5986         .rpc_release = nfs4_free_reclaim_complete_data,
5987 };
5988
5989 /*
5990  * Issue a global reclaim complete.
5991  */
5992 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5993 {
5994         struct nfs4_reclaim_complete_data *calldata;
5995         struct rpc_task *task;
5996         struct rpc_message msg = {
5997                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5998         };
5999         struct rpc_task_setup task_setup_data = {
6000                 .rpc_client = clp->cl_rpcclient,
6001                 .rpc_message = &msg,
6002                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6003                 .flags = RPC_TASK_ASYNC,
6004         };
6005         int status = -ENOMEM;
6006
6007         dprintk("--> %s\n", __func__);
6008         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6009         if (calldata == NULL)
6010                 goto out;
6011         calldata->clp = clp;
6012         calldata->arg.one_fs = 0;
6013
6014         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6015         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6016         msg.rpc_argp = &calldata->arg;
6017         msg.rpc_resp = &calldata->res;
6018         task_setup_data.callback_data = calldata;
6019         task = rpc_run_task(&task_setup_data);
6020         if (IS_ERR(task)) {
6021                 status = PTR_ERR(task);
6022                 goto out;
6023         }
6024         status = nfs4_wait_for_completion_rpc_task(task);
6025         if (status == 0)
6026                 status = task->tk_status;
6027         rpc_put_task(task);
6028         return 0;
6029 out:
6030         dprintk("<-- %s status=%d\n", __func__, status);
6031         return status;
6032 }
6033
6034 static void
6035 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6036 {
6037         struct nfs4_layoutget *lgp = calldata;
6038         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6039         struct nfs4_session *session = nfs4_get_session(server);
6040
6041         dprintk("--> %s\n", __func__);
6042         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6043          * right now covering the LAYOUTGET we are about to send.
6044          * However, that is not so catastrophic, and there seems
6045          * to be no way to prevent it completely.
6046          */
6047         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6048                                 &lgp->res.seq_res, task))
6049                 return;
6050         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6051                                           NFS_I(lgp->args.inode)->layout,
6052                                           lgp->args.ctx->state)) {
6053                 rpc_exit(task, NFS4_OK);
6054         }
6055 }
6056
6057 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6058 {
6059         struct nfs4_layoutget *lgp = calldata;
6060         struct inode *inode = lgp->args.inode;
6061         struct nfs_server *server = NFS_SERVER(inode);
6062         struct pnfs_layout_hdr *lo;
6063         struct nfs4_state *state = NULL;
6064         unsigned long timeo, giveup;
6065
6066         dprintk("--> %s\n", __func__);
6067
6068         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6069                 goto out;
6070
6071         switch (task->tk_status) {
6072         case 0:
6073                 goto out;
6074         case -NFS4ERR_LAYOUTTRYLATER:
6075         case -NFS4ERR_RECALLCONFLICT:
6076                 timeo = rpc_get_timeout(task->tk_client);
6077                 giveup = lgp->args.timestamp + timeo;
6078                 if (time_after(giveup, jiffies))
6079                         task->tk_status = -NFS4ERR_DELAY;
6080                 break;
6081         case -NFS4ERR_EXPIRED:
6082         case -NFS4ERR_BAD_STATEID:
6083                 spin_lock(&inode->i_lock);
6084                 lo = NFS_I(inode)->layout;
6085                 if (!lo || list_empty(&lo->plh_segs)) {
6086                         spin_unlock(&inode->i_lock);
6087                         /* If the open stateid was bad, then recover it. */
6088                         state = lgp->args.ctx->state;
6089                 } else {
6090                         LIST_HEAD(head);
6091
6092                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6093                         spin_unlock(&inode->i_lock);
6094                         /* Mark the bad layout state as invalid, then
6095                          * retry using the open stateid. */
6096                         pnfs_free_lseg_list(&head);
6097                 }
6098         }
6099         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6100                 rpc_restart_call_prepare(task);
6101 out:
6102         dprintk("<-- %s\n", __func__);
6103 }
6104
6105 static size_t max_response_pages(struct nfs_server *server)
6106 {
6107         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6108         return nfs_page_array_len(0, max_resp_sz);
6109 }
6110
6111 static void nfs4_free_pages(struct page **pages, size_t size)
6112 {
6113         int i;
6114
6115         if (!pages)
6116                 return;
6117
6118         for (i = 0; i < size; i++) {
6119                 if (!pages[i])
6120                         break;
6121                 __free_page(pages[i]);
6122         }
6123         kfree(pages);
6124 }
6125
6126 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6127 {
6128         struct page **pages;
6129         int i;
6130
6131         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6132         if (!pages) {
6133                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6134                 return NULL;
6135         }
6136
6137         for (i = 0; i < size; i++) {
6138                 pages[i] = alloc_page(gfp_flags);
6139                 if (!pages[i]) {
6140                         dprintk("%s: failed to allocate page\n", __func__);
6141                         nfs4_free_pages(pages, size);
6142                         return NULL;
6143                 }
6144         }
6145
6146         return pages;
6147 }
6148
6149 static void nfs4_layoutget_release(void *calldata)
6150 {
6151         struct nfs4_layoutget *lgp = calldata;
6152         struct inode *inode = lgp->args.inode;
6153         struct nfs_server *server = NFS_SERVER(inode);
6154         size_t max_pages = max_response_pages(server);
6155
6156         dprintk("--> %s\n", __func__);
6157         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6158         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6159         put_nfs_open_context(lgp->args.ctx);
6160         kfree(calldata);
6161         dprintk("<-- %s\n", __func__);
6162 }
6163
6164 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6165         .rpc_call_prepare = nfs4_layoutget_prepare,
6166         .rpc_call_done = nfs4_layoutget_done,
6167         .rpc_release = nfs4_layoutget_release,
6168 };
6169
6170 struct pnfs_layout_segment *
6171 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6172 {
6173         struct inode *inode = lgp->args.inode;
6174         struct nfs_server *server = NFS_SERVER(inode);
6175         size_t max_pages = max_response_pages(server);
6176         struct rpc_task *task;
6177         struct rpc_message msg = {
6178                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6179                 .rpc_argp = &lgp->args,
6180                 .rpc_resp = &lgp->res,
6181         };
6182         struct rpc_task_setup task_setup_data = {
6183                 .rpc_client = server->client,
6184                 .rpc_message = &msg,
6185                 .callback_ops = &nfs4_layoutget_call_ops,
6186                 .callback_data = lgp,
6187                 .flags = RPC_TASK_ASYNC,
6188         };
6189         struct pnfs_layout_segment *lseg = NULL;
6190         int status = 0;
6191
6192         dprintk("--> %s\n", __func__);
6193
6194         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6195         if (!lgp->args.layout.pages) {
6196                 nfs4_layoutget_release(lgp);
6197                 return ERR_PTR(-ENOMEM);
6198         }
6199         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6200         lgp->args.timestamp = jiffies;
6201
6202         lgp->res.layoutp = &lgp->args.layout;
6203         lgp->res.seq_res.sr_slot = NULL;
6204         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6205
6206         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6207         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6208
6209         task = rpc_run_task(&task_setup_data);
6210         if (IS_ERR(task))
6211                 return ERR_CAST(task);
6212         status = nfs4_wait_for_completion_rpc_task(task);
6213         if (status == 0)
6214                 status = task->tk_status;
6215         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6216         if (status == 0 && lgp->res.layoutp->len)
6217                 lseg = pnfs_layout_process(lgp);
6218         rpc_put_task(task);
6219         dprintk("<-- %s status=%d\n", __func__, status);
6220         if (status)
6221                 return ERR_PTR(status);
6222         return lseg;
6223 }
6224
6225 static void
6226 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6227 {
6228         struct nfs4_layoutreturn *lrp = calldata;
6229
6230         dprintk("--> %s\n", __func__);
6231         nfs41_setup_sequence(lrp->clp->cl_session,
6232                         &lrp->args.seq_args,
6233                         &lrp->res.seq_res,
6234                         task);
6235 }
6236
6237 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6238 {
6239         struct nfs4_layoutreturn *lrp = calldata;
6240         struct nfs_server *server;
6241
6242         dprintk("--> %s\n", __func__);
6243
6244         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6245                 return;
6246
6247         server = NFS_SERVER(lrp->args.inode);
6248         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6249                 rpc_restart_call_prepare(task);
6250                 return;
6251         }
6252         dprintk("<-- %s\n", __func__);
6253 }
6254
6255 static void nfs4_layoutreturn_release(void *calldata)
6256 {
6257         struct nfs4_layoutreturn *lrp = calldata;
6258         struct pnfs_layout_hdr *lo = lrp->args.layout;
6259
6260         dprintk("--> %s\n", __func__);
6261         spin_lock(&lo->plh_inode->i_lock);
6262         if (lrp->res.lrs_present)
6263                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6264         lo->plh_block_lgets--;
6265         spin_unlock(&lo->plh_inode->i_lock);
6266         pnfs_put_layout_hdr(lrp->args.layout);
6267         kfree(calldata);
6268         dprintk("<-- %s\n", __func__);
6269 }
6270
6271 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6272         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6273         .rpc_call_done = nfs4_layoutreturn_done,
6274         .rpc_release = nfs4_layoutreturn_release,
6275 };
6276
6277 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6278 {
6279         struct rpc_task *task;
6280         struct rpc_message msg = {
6281                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6282                 .rpc_argp = &lrp->args,
6283                 .rpc_resp = &lrp->res,
6284         };
6285         struct rpc_task_setup task_setup_data = {
6286                 .rpc_client = lrp->clp->cl_rpcclient,
6287                 .rpc_message = &msg,
6288                 .callback_ops = &nfs4_layoutreturn_call_ops,
6289                 .callback_data = lrp,
6290         };
6291         int status;
6292
6293         dprintk("--> %s\n", __func__);
6294         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6295         task = rpc_run_task(&task_setup_data);
6296         if (IS_ERR(task))
6297                 return PTR_ERR(task);
6298         status = task->tk_status;
6299         dprintk("<-- %s status=%d\n", __func__, status);
6300         rpc_put_task(task);
6301         return status;
6302 }
6303
6304 /*
6305  * Retrieve the list of Data Server devices from the MDS.
6306  */
6307 static int _nfs4_getdevicelist(struct nfs_server *server,
6308                                     const struct nfs_fh *fh,
6309                                     struct pnfs_devicelist *devlist)
6310 {
6311         struct nfs4_getdevicelist_args args = {
6312                 .fh = fh,
6313                 .layoutclass = server->pnfs_curr_ld->id,
6314         };
6315         struct nfs4_getdevicelist_res res = {
6316                 .devlist = devlist,
6317         };
6318         struct rpc_message msg = {
6319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6320                 .rpc_argp = &args,
6321                 .rpc_resp = &res,
6322         };
6323         int status;
6324
6325         dprintk("--> %s\n", __func__);
6326         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6327                                 &res.seq_res, 0);
6328         dprintk("<-- %s status=%d\n", __func__, status);
6329         return status;
6330 }
6331
6332 int nfs4_proc_getdevicelist(struct nfs_server *server,
6333                             const struct nfs_fh *fh,
6334                             struct pnfs_devicelist *devlist)
6335 {
6336         struct nfs4_exception exception = { };
6337         int err;
6338
6339         do {
6340                 err = nfs4_handle_exception(server,
6341                                 _nfs4_getdevicelist(server, fh, devlist),
6342                                 &exception);
6343         } while (exception.retry);
6344
6345         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6346                 err, devlist->num_devs);
6347
6348         return err;
6349 }
6350 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6351
6352 static int
6353 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6354 {
6355         struct nfs4_getdeviceinfo_args args = {
6356                 .pdev = pdev,
6357         };
6358         struct nfs4_getdeviceinfo_res res = {
6359                 .pdev = pdev,
6360         };
6361         struct rpc_message msg = {
6362                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6363                 .rpc_argp = &args,
6364                 .rpc_resp = &res,
6365         };
6366         int status;
6367
6368         dprintk("--> %s\n", __func__);
6369         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6370         dprintk("<-- %s status=%d\n", __func__, status);
6371
6372         return status;
6373 }
6374
6375 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6376 {
6377         struct nfs4_exception exception = { };
6378         int err;
6379
6380         do {
6381                 err = nfs4_handle_exception(server,
6382                                         _nfs4_proc_getdeviceinfo(server, pdev),
6383                                         &exception);
6384         } while (exception.retry);
6385         return err;
6386 }
6387 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6388
6389 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6390 {
6391         struct nfs4_layoutcommit_data *data = calldata;
6392         struct nfs_server *server = NFS_SERVER(data->args.inode);
6393         struct nfs4_session *session = nfs4_get_session(server);
6394
6395         nfs41_setup_sequence(session,
6396                         &data->args.seq_args,
6397                         &data->res.seq_res,
6398                         task);
6399 }
6400
6401 static void
6402 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6403 {
6404         struct nfs4_layoutcommit_data *data = calldata;
6405         struct nfs_server *server = NFS_SERVER(data->args.inode);
6406
6407         if (!nfs41_sequence_done(task, &data->res.seq_res))
6408                 return;
6409
6410         switch (task->tk_status) { /* Just ignore these failures */
6411         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6412         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6413         case -NFS4ERR_BADLAYOUT:     /* no layout */
6414         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6415                 task->tk_status = 0;
6416                 break;
6417         case 0:
6418                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6419                                                    data->res.fattr);
6420                 break;
6421         default:
6422                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6423                         rpc_restart_call_prepare(task);
6424                         return;
6425                 }
6426         }
6427 }
6428
6429 static void nfs4_layoutcommit_release(void *calldata)
6430 {
6431         struct nfs4_layoutcommit_data *data = calldata;
6432
6433         pnfs_cleanup_layoutcommit(data);
6434         put_rpccred(data->cred);
6435         kfree(data);
6436 }
6437
6438 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6439         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6440         .rpc_call_done = nfs4_layoutcommit_done,
6441         .rpc_release = nfs4_layoutcommit_release,
6442 };
6443
6444 int
6445 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6446 {
6447         struct rpc_message msg = {
6448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6449                 .rpc_argp = &data->args,
6450                 .rpc_resp = &data->res,
6451                 .rpc_cred = data->cred,
6452         };
6453         struct rpc_task_setup task_setup_data = {
6454                 .task = &data->task,
6455                 .rpc_client = NFS_CLIENT(data->args.inode),
6456                 .rpc_message = &msg,
6457                 .callback_ops = &nfs4_layoutcommit_ops,
6458                 .callback_data = data,
6459                 .flags = RPC_TASK_ASYNC,
6460         };
6461         struct rpc_task *task;
6462         int status = 0;
6463
6464         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6465                 "lbw: %llu inode %lu\n",
6466                 data->task.tk_pid, sync,
6467                 data->args.lastbytewritten,
6468                 data->args.inode->i_ino);
6469
6470         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6471         task = rpc_run_task(&task_setup_data);
6472         if (IS_ERR(task))
6473                 return PTR_ERR(task);
6474         if (sync == false)
6475                 goto out;
6476         status = nfs4_wait_for_completion_rpc_task(task);
6477         if (status != 0)
6478                 goto out;
6479         status = task->tk_status;
6480 out:
6481         dprintk("%s: status %d\n", __func__, status);
6482         rpc_put_task(task);
6483         return status;
6484 }
6485
6486 static int
6487 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6488                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6489 {
6490         struct nfs41_secinfo_no_name_args args = {
6491                 .style = SECINFO_STYLE_CURRENT_FH,
6492         };
6493         struct nfs4_secinfo_res res = {
6494                 .flavors = flavors,
6495         };
6496         struct rpc_message msg = {
6497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6498                 .rpc_argp = &args,
6499                 .rpc_resp = &res,
6500         };
6501         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6502 }
6503
6504 static int
6505 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6506                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6507 {
6508         struct nfs4_exception exception = { };
6509         int err;
6510         do {
6511                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6512                 switch (err) {
6513                 case 0:
6514                 case -NFS4ERR_WRONGSEC:
6515                 case -NFS4ERR_NOTSUPP:
6516                         goto out;
6517                 default:
6518                         err = nfs4_handle_exception(server, err, &exception);
6519                 }
6520         } while (exception.retry);
6521 out:
6522         return err;
6523 }
6524
6525 static int
6526 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6527                     struct nfs_fsinfo *info)
6528 {
6529         int err;
6530         struct page *page;
6531         rpc_authflavor_t flavor;
6532         struct nfs4_secinfo_flavors *flavors;
6533
6534         page = alloc_page(GFP_KERNEL);
6535         if (!page) {
6536                 err = -ENOMEM;
6537                 goto out;
6538         }
6539
6540         flavors = page_address(page);
6541         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6542
6543         /*
6544          * Fall back on "guess and check" method if
6545          * the server doesn't support SECINFO_NO_NAME
6546          */
6547         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6548                 err = nfs4_find_root_sec(server, fhandle, info);
6549                 goto out_freepage;
6550         }
6551         if (err)
6552                 goto out_freepage;
6553
6554         flavor = nfs_find_best_sec(flavors);
6555         if (err == 0)
6556                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6557
6558 out_freepage:
6559         put_page(page);
6560         if (err == -EACCES)
6561                 return -EPERM;
6562 out:
6563         return err;
6564 }
6565
6566 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6567 {
6568         int status;
6569         struct nfs41_test_stateid_args args = {
6570                 .stateid = stateid,
6571         };
6572         struct nfs41_test_stateid_res res;
6573         struct rpc_message msg = {
6574                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6575                 .rpc_argp = &args,
6576                 .rpc_resp = &res,
6577         };
6578
6579         dprintk("NFS call  test_stateid %p\n", stateid);
6580         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6581         nfs4_set_sequence_privileged(&args.seq_args);
6582         status = nfs4_call_sync_sequence(server->client, server, &msg,
6583                         &args.seq_args, &res.seq_res);
6584         if (status != NFS_OK) {
6585                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6586                 return status;
6587         }
6588         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6589         return -res.status;
6590 }
6591
6592 /**
6593  * nfs41_test_stateid - perform a TEST_STATEID operation
6594  *
6595  * @server: server / transport on which to perform the operation
6596  * @stateid: state ID to test
6597  *
6598  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6599  * Otherwise a negative NFS4ERR value is returned if the operation
6600  * failed or the state ID is not currently valid.
6601  */
6602 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6603 {
6604         struct nfs4_exception exception = { };
6605         int err;
6606         do {
6607                 err = _nfs41_test_stateid(server, stateid);
6608                 if (err != -NFS4ERR_DELAY)
6609                         break;
6610                 nfs4_handle_exception(server, err, &exception);
6611         } while (exception.retry);
6612         return err;
6613 }
6614
6615 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6616 {
6617         struct nfs41_free_stateid_args args = {
6618                 .stateid = stateid,
6619         };
6620         struct nfs41_free_stateid_res res;
6621         struct rpc_message msg = {
6622                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6623                 .rpc_argp = &args,
6624                 .rpc_resp = &res,
6625         };
6626         int status;
6627
6628         dprintk("NFS call  free_stateid %p\n", stateid);
6629         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6630         nfs4_set_sequence_privileged(&args.seq_args);
6631         status = nfs4_call_sync_sequence(server->client, server, &msg,
6632                         &args.seq_args, &res.seq_res);
6633         dprintk("NFS reply free_stateid: %d\n", status);
6634         return status;
6635 }
6636
6637 /**
6638  * nfs41_free_stateid - perform a FREE_STATEID operation
6639  *
6640  * @server: server / transport on which to perform the operation
6641  * @stateid: state ID to release
6642  *
6643  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6644  * negative NFS4ERR value is returned.
6645  */
6646 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6647 {
6648         struct nfs4_exception exception = { };
6649         int err;
6650         do {
6651                 err = _nfs4_free_stateid(server, stateid);
6652                 if (err != -NFS4ERR_DELAY)
6653                         break;
6654                 nfs4_handle_exception(server, err, &exception);
6655         } while (exception.retry);
6656         return err;
6657 }
6658
6659 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6660                 const nfs4_stateid *s2)
6661 {
6662         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6663                 return false;
6664
6665         if (s1->seqid == s2->seqid)
6666                 return true;
6667         if (s1->seqid == 0 || s2->seqid == 0)
6668                 return true;
6669
6670         return false;
6671 }
6672
6673 #endif /* CONFIG_NFS_V4_1 */
6674
6675 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6676                 const nfs4_stateid *s2)
6677 {
6678         return nfs4_stateid_match(s1, s2);
6679 }
6680
6681
6682 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6683         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6684         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6685         .recover_open   = nfs4_open_reclaim,
6686         .recover_lock   = nfs4_lock_reclaim,
6687         .establish_clid = nfs4_init_clientid,
6688         .get_clid_cred  = nfs4_get_setclientid_cred,
6689         .detect_trunking = nfs40_discover_server_trunking,
6690 };
6691
6692 #if defined(CONFIG_NFS_V4_1)
6693 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6694         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6695         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6696         .recover_open   = nfs4_open_reclaim,
6697         .recover_lock   = nfs4_lock_reclaim,
6698         .establish_clid = nfs41_init_clientid,
6699         .get_clid_cred  = nfs4_get_exchange_id_cred,
6700         .reclaim_complete = nfs41_proc_reclaim_complete,
6701         .detect_trunking = nfs41_discover_server_trunking,
6702 };
6703 #endif /* CONFIG_NFS_V4_1 */
6704
6705 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6706         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6707         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6708         .recover_open   = nfs4_open_expired,
6709         .recover_lock   = nfs4_lock_expired,
6710         .establish_clid = nfs4_init_clientid,
6711         .get_clid_cred  = nfs4_get_setclientid_cred,
6712 };
6713
6714 #if defined(CONFIG_NFS_V4_1)
6715 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6716         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6717         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6718         .recover_open   = nfs41_open_expired,
6719         .recover_lock   = nfs41_lock_expired,
6720         .establish_clid = nfs41_init_clientid,
6721         .get_clid_cred  = nfs4_get_exchange_id_cred,
6722 };
6723 #endif /* CONFIG_NFS_V4_1 */
6724
6725 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6726         .sched_state_renewal = nfs4_proc_async_renew,
6727         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6728         .renew_lease = nfs4_proc_renew,
6729 };
6730
6731 #if defined(CONFIG_NFS_V4_1)
6732 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6733         .sched_state_renewal = nfs41_proc_async_sequence,
6734         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6735         .renew_lease = nfs4_proc_sequence,
6736 };
6737 #endif
6738
6739 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6740         .minor_version = 0,
6741         .call_sync = _nfs4_call_sync,
6742         .match_stateid = nfs4_match_stateid,
6743         .find_root_sec = nfs4_find_root_sec,
6744         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6745         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6746         .state_renewal_ops = &nfs40_state_renewal_ops,
6747 };
6748
6749 #if defined(CONFIG_NFS_V4_1)
6750 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6751         .minor_version = 1,
6752         .call_sync = nfs4_call_sync_sequence,
6753         .match_stateid = nfs41_match_stateid,
6754         .find_root_sec = nfs41_find_root_sec,
6755         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6756         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6757         .state_renewal_ops = &nfs41_state_renewal_ops,
6758 };
6759 #endif
6760
6761 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6762         [0] = &nfs_v4_0_minor_ops,
6763 #if defined(CONFIG_NFS_V4_1)
6764         [1] = &nfs_v4_1_minor_ops,
6765 #endif
6766 };
6767
6768 const struct inode_operations nfs4_dir_inode_operations = {
6769         .create         = nfs_create,
6770         .lookup         = nfs_lookup,
6771         .atomic_open    = nfs_atomic_open,
6772         .link           = nfs_link,
6773         .unlink         = nfs_unlink,
6774         .symlink        = nfs_symlink,
6775         .mkdir          = nfs_mkdir,
6776         .rmdir          = nfs_rmdir,
6777         .mknod          = nfs_mknod,
6778         .rename         = nfs_rename,
6779         .permission     = nfs_permission,
6780         .getattr        = nfs_getattr,
6781         .setattr        = nfs_setattr,
6782         .getxattr       = generic_getxattr,
6783         .setxattr       = generic_setxattr,
6784         .listxattr      = generic_listxattr,
6785         .removexattr    = generic_removexattr,
6786 };
6787
6788 static const struct inode_operations nfs4_file_inode_operations = {
6789         .permission     = nfs_permission,
6790         .getattr        = nfs_getattr,
6791         .setattr        = nfs_setattr,
6792         .getxattr       = generic_getxattr,
6793         .setxattr       = generic_setxattr,
6794         .listxattr      = generic_listxattr,
6795         .removexattr    = generic_removexattr,
6796 };
6797
6798 const struct nfs_rpc_ops nfs_v4_clientops = {
6799         .version        = 4,                    /* protocol version */
6800         .dentry_ops     = &nfs4_dentry_operations,
6801         .dir_inode_ops  = &nfs4_dir_inode_operations,
6802         .file_inode_ops = &nfs4_file_inode_operations,
6803         .file_ops       = &nfs4_file_operations,
6804         .getroot        = nfs4_proc_get_root,
6805         .submount       = nfs4_submount,
6806         .try_mount      = nfs4_try_mount,
6807         .getattr        = nfs4_proc_getattr,
6808         .setattr        = nfs4_proc_setattr,
6809         .lookup         = nfs4_proc_lookup,
6810         .access         = nfs4_proc_access,
6811         .readlink       = nfs4_proc_readlink,
6812         .create         = nfs4_proc_create,
6813         .remove         = nfs4_proc_remove,
6814         .unlink_setup   = nfs4_proc_unlink_setup,
6815         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6816         .unlink_done    = nfs4_proc_unlink_done,
6817         .rename         = nfs4_proc_rename,
6818         .rename_setup   = nfs4_proc_rename_setup,
6819         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6820         .rename_done    = nfs4_proc_rename_done,
6821         .link           = nfs4_proc_link,
6822         .symlink        = nfs4_proc_symlink,
6823         .mkdir          = nfs4_proc_mkdir,
6824         .rmdir          = nfs4_proc_remove,
6825         .readdir        = nfs4_proc_readdir,
6826         .mknod          = nfs4_proc_mknod,
6827         .statfs         = nfs4_proc_statfs,
6828         .fsinfo         = nfs4_proc_fsinfo,
6829         .pathconf       = nfs4_proc_pathconf,
6830         .set_capabilities = nfs4_server_capabilities,
6831         .decode_dirent  = nfs4_decode_dirent,
6832         .read_setup     = nfs4_proc_read_setup,
6833         .read_pageio_init = pnfs_pageio_init_read,
6834         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6835         .read_done      = nfs4_read_done,
6836         .write_setup    = nfs4_proc_write_setup,
6837         .write_pageio_init = pnfs_pageio_init_write,
6838         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6839         .write_done     = nfs4_write_done,
6840         .commit_setup   = nfs4_proc_commit_setup,
6841         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6842         .commit_done    = nfs4_commit_done,
6843         .lock           = nfs4_proc_lock,
6844         .clear_acl_cache = nfs4_zap_acl_attr,
6845         .close_context  = nfs4_close_context,
6846         .open_context   = nfs4_atomic_open,
6847         .have_delegation = nfs4_have_delegation,
6848         .return_delegation = nfs4_inode_return_delegation,
6849         .alloc_client   = nfs4_alloc_client,
6850         .init_client    = nfs4_init_client,
6851         .free_client    = nfs4_free_client,
6852         .create_server  = nfs4_create_server,
6853         .clone_server   = nfs_clone_server,
6854 };
6855
6856 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6857         .prefix = XATTR_NAME_NFSV4_ACL,
6858         .list   = nfs4_xattr_list_nfs4_acl,
6859         .get    = nfs4_xattr_get_nfs4_acl,
6860         .set    = nfs4_xattr_set_nfs4_acl,
6861 };
6862
6863 const struct xattr_handler *nfs4_xattr_handlers[] = {
6864         &nfs4_xattr_nfs4_acl_handler,
6865         NULL
6866 };
6867
6868 /*
6869  * Local variables:
6870  *  c-basic-offset: 8
6871  * End:
6872  */