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