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