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 {
1631         struct nfs_access_entry cache;
1632         u32 mask;
1633
1634         /* access call failed or for some reason the server doesn't
1635          * support any access modes -- defer access call until later */
1636         if (opendata->o_res.access_supported == 0)
1637                 return 0;
1638
1639         mask = 0;
1640         /* don't check MAY_WRITE - a newly created file may not have
1641          * write mode bits, but POSIX allows the creating process to write */
1642         if (fmode & FMODE_READ)
1643                 mask |= MAY_READ;
1644         if (fmode & FMODE_EXEC)
1645                 mask |= MAY_EXEC;
1646
1647         cache.cred = cred;
1648         cache.jiffies = jiffies;
1649         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1650         nfs_access_add_cache(state->inode, &cache);
1651
1652         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1653                 return 0;
1654
1655         /* even though OPEN succeeded, access is denied. Close the file */
1656         nfs4_close_state(state, fmode);
1657         return -EACCES;
1658 }
1659
1660 /*
1661  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1662  */
1663 static int _nfs4_proc_open(struct nfs4_opendata *data)
1664 {
1665         struct inode *dir = data->dir->d_inode;
1666         struct nfs_server *server = NFS_SERVER(dir);
1667         struct nfs_openargs *o_arg = &data->o_arg;
1668         struct nfs_openres *o_res = &data->o_res;
1669         int status;
1670
1671         status = nfs4_run_open_task(data, 0);
1672         if (!data->rpc_done)
1673                 return status;
1674         if (status != 0) {
1675                 if (status == -NFS4ERR_BADNAME &&
1676                                 !(o_arg->open_flags & O_CREAT))
1677                         return -ENOENT;
1678                 return status;
1679         }
1680
1681         nfs_fattr_map_and_free_names(server, &data->f_attr);
1682
1683         if (o_arg->open_flags & O_CREAT)
1684                 update_changeattr(dir, &o_res->cinfo);
1685         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1686                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1687         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1688                 status = _nfs4_proc_open_confirm(data);
1689                 if (status != 0)
1690                         return status;
1691         }
1692         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1693                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1694         return 0;
1695 }
1696
1697 static int nfs4_recover_expired_lease(struct nfs_server *server)
1698 {
1699         return nfs4_client_recover_expired_lease(server->nfs_client);
1700 }
1701
1702 /*
1703  * OPEN_EXPIRED:
1704  *      reclaim state on the server after a network partition.
1705  *      Assumes caller holds the appropriate lock
1706  */
1707 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1708 {
1709         struct nfs4_opendata *opendata;
1710         int ret;
1711
1712         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1713         if (IS_ERR(opendata))
1714                 return PTR_ERR(opendata);
1715         ret = nfs4_open_recover(opendata, state);
1716         if (ret == -ESTALE)
1717                 d_drop(ctx->dentry);
1718         nfs4_opendata_put(opendata);
1719         return ret;
1720 }
1721
1722 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1723 {
1724         struct nfs_server *server = NFS_SERVER(state->inode);
1725         struct nfs4_exception exception = { };
1726         int err;
1727
1728         do {
1729                 err = _nfs4_open_expired(ctx, state);
1730                 switch (err) {
1731                 default:
1732                         goto out;
1733                 case -NFS4ERR_GRACE:
1734                 case -NFS4ERR_DELAY:
1735                         nfs4_handle_exception(server, err, &exception);
1736                         err = 0;
1737                 }
1738         } while (exception.retry);
1739 out:
1740         return err;
1741 }
1742
1743 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1744 {
1745         struct nfs_open_context *ctx;
1746         int ret;
1747
1748         ctx = nfs4_state_find_open_context(state);
1749         if (IS_ERR(ctx))
1750                 return PTR_ERR(ctx);
1751         ret = nfs4_do_open_expired(ctx, state);
1752         put_nfs_open_context(ctx);
1753         return ret;
1754 }
1755
1756 #if defined(CONFIG_NFS_V4_1)
1757 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1758 {
1759         struct nfs_server *server = NFS_SERVER(state->inode);
1760         nfs4_stateid *stateid = &state->stateid;
1761         int status;
1762
1763         /* If a state reset has been done, test_stateid is unneeded */
1764         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1765                 return;
1766
1767         status = nfs41_test_stateid(server, stateid);
1768         if (status != NFS_OK) {
1769                 /* Free the stateid unless the server explicitly
1770                  * informs us the stateid is unrecognized. */
1771                 if (status != -NFS4ERR_BAD_STATEID)
1772                         nfs41_free_stateid(server, stateid);
1773                 nfs_remove_bad_delegation(state->inode);
1774
1775                 write_seqlock(&state->seqlock);
1776                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1777                 write_sequnlock(&state->seqlock);
1778                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1779         }
1780 }
1781
1782 /**
1783  * nfs41_check_open_stateid - possibly free an open stateid
1784  *
1785  * @state: NFSv4 state for an inode
1786  *
1787  * Returns NFS_OK if recovery for this stateid is now finished.
1788  * Otherwise a negative NFS4ERR value is returned.
1789  */
1790 static int nfs41_check_open_stateid(struct nfs4_state *state)
1791 {
1792         struct nfs_server *server = NFS_SERVER(state->inode);
1793         nfs4_stateid *stateid = &state->open_stateid;
1794         int status;
1795
1796         /* If a state reset has been done, test_stateid is unneeded */
1797         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1798             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1799             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1800                 return -NFS4ERR_BAD_STATEID;
1801
1802         status = nfs41_test_stateid(server, stateid);
1803         if (status != NFS_OK) {
1804                 /* Free the stateid unless the server explicitly
1805                  * informs us the stateid is unrecognized. */
1806                 if (status != -NFS4ERR_BAD_STATEID)
1807                         nfs41_free_stateid(server, stateid);
1808
1809                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1810                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1811                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1812         }
1813         return status;
1814 }
1815
1816 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1817 {
1818         int status;
1819
1820         nfs41_clear_delegation_stateid(state);
1821         status = nfs41_check_open_stateid(state);
1822         if (status != NFS_OK)
1823                 status = nfs4_open_expired(sp, state);
1824         return status;
1825 }
1826 #endif
1827
1828 /*
1829  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1830  * fields corresponding to attributes that were used to store the verifier.
1831  * Make sure we clobber those fields in the later setattr call
1832  */
1833 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1834 {
1835         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1836             !(sattr->ia_valid & ATTR_ATIME_SET))
1837                 sattr->ia_valid |= ATTR_ATIME;
1838
1839         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1840             !(sattr->ia_valid & ATTR_MTIME_SET))
1841                 sattr->ia_valid |= ATTR_MTIME;
1842 }
1843
1844 /*
1845  * Returns a referenced nfs4_state
1846  */
1847 static int _nfs4_do_open(struct inode *dir,
1848                         struct dentry *dentry,
1849                         fmode_t fmode,
1850                         int flags,
1851                         struct iattr *sattr,
1852                         struct rpc_cred *cred,
1853                         struct nfs4_state **res,
1854                         struct nfs4_threshold **ctx_th)
1855 {
1856         struct nfs4_state_owner  *sp;
1857         struct nfs4_state     *state = NULL;
1858         struct nfs_server       *server = NFS_SERVER(dir);
1859         struct nfs4_opendata *opendata;
1860         int status;
1861
1862         /* Protect against reboot recovery conflicts */
1863         status = -ENOMEM;
1864         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1865         if (sp == NULL) {
1866                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1867                 goto out_err;
1868         }
1869         status = nfs4_recover_expired_lease(server);
1870         if (status != 0)
1871                 goto err_put_state_owner;
1872         if (dentry->d_inode != NULL)
1873                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1874         status = -ENOMEM;
1875         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1876         if (opendata == NULL)
1877                 goto err_put_state_owner;
1878
1879         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1880                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1881                 if (!opendata->f_attr.mdsthreshold)
1882                         goto err_opendata_put;
1883                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1884         }
1885         if (dentry->d_inode != NULL)
1886                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1887
1888         status = _nfs4_proc_open(opendata);
1889         if (status != 0)
1890                 goto err_opendata_put;
1891
1892         state = nfs4_opendata_to_nfs4_state(opendata);
1893         status = PTR_ERR(state);
1894         if (IS_ERR(state))
1895                 goto err_opendata_put;
1896         if (server->caps & NFS_CAP_POSIX_LOCK)
1897                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1898
1899         status = nfs4_opendata_access(cred, opendata, state, fmode);
1900         if (status != 0)
1901                 goto err_opendata_put;
1902
1903         if (opendata->o_arg.open_flags & O_EXCL) {
1904                 nfs4_exclusive_attrset(opendata, sattr);
1905
1906                 nfs_fattr_init(opendata->o_res.f_attr);
1907                 status = nfs4_do_setattr(state->inode, cred,
1908                                 opendata->o_res.f_attr, sattr,
1909                                 state);
1910                 if (status == 0)
1911                         nfs_setattr_update_inode(state->inode, sattr);
1912                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1913         }
1914
1915         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1916                 *ctx_th = opendata->f_attr.mdsthreshold;
1917         else
1918                 kfree(opendata->f_attr.mdsthreshold);
1919         opendata->f_attr.mdsthreshold = NULL;
1920
1921         nfs4_opendata_put(opendata);
1922         nfs4_put_state_owner(sp);
1923         *res = state;
1924         return 0;
1925 err_opendata_put:
1926         kfree(opendata->f_attr.mdsthreshold);
1927         nfs4_opendata_put(opendata);
1928 err_put_state_owner:
1929         nfs4_put_state_owner(sp);
1930 out_err:
1931         *res = NULL;
1932         return status;
1933 }
1934
1935
1936 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1937                                         struct dentry *dentry,
1938                                         fmode_t fmode,
1939                                         int flags,
1940                                         struct iattr *sattr,
1941                                         struct rpc_cred *cred,
1942                                         struct nfs4_threshold **ctx_th)
1943 {
1944         struct nfs4_exception exception = { };
1945         struct nfs4_state *res;
1946         int status;
1947
1948         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1949         do {
1950                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1951                                        &res, ctx_th);
1952                 if (status == 0)
1953                         break;
1954                 /* NOTE: BAD_SEQID means the server and client disagree about the
1955                  * book-keeping w.r.t. state-changing operations
1956                  * (OPEN/CLOSE/LOCK/LOCKU...)
1957                  * It is actually a sign of a bug on the client or on the server.
1958                  *
1959                  * If we receive a BAD_SEQID error in the particular case of
1960                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1961                  * have unhashed the old state_owner for us, and that we can
1962                  * therefore safely retry using a new one. We should still warn
1963                  * the user though...
1964                  */
1965                 if (status == -NFS4ERR_BAD_SEQID) {
1966                         pr_warn_ratelimited("NFS: v4 server %s "
1967                                         " returned a bad sequence-id error!\n",
1968                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1969                         exception.retry = 1;
1970                         continue;
1971                 }
1972                 /*
1973                  * BAD_STATEID on OPEN means that the server cancelled our
1974                  * state before it received the OPEN_CONFIRM.
1975                  * Recover by retrying the request as per the discussion
1976                  * on Page 181 of RFC3530.
1977                  */
1978                 if (status == -NFS4ERR_BAD_STATEID) {
1979                         exception.retry = 1;
1980                         continue;
1981                 }
1982                 if (status == -EAGAIN) {
1983                         /* We must have found a delegation */
1984                         exception.retry = 1;
1985                         continue;
1986                 }
1987                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1988                                         status, &exception));
1989         } while (exception.retry);
1990         return res;
1991 }
1992
1993 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1994                             struct nfs_fattr *fattr, struct iattr *sattr,
1995                             struct nfs4_state *state)
1996 {
1997         struct nfs_server *server = NFS_SERVER(inode);
1998         struct nfs_setattrargs  arg = {
1999                 .fh             = NFS_FH(inode),
2000                 .iap            = sattr,
2001                 .server         = server,
2002                 .bitmask = server->attr_bitmask,
2003         };
2004         struct nfs_setattrres  res = {
2005                 .fattr          = fattr,
2006                 .server         = server,
2007         };
2008         struct rpc_message msg = {
2009                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2010                 .rpc_argp       = &arg,
2011                 .rpc_resp       = &res,
2012                 .rpc_cred       = cred,
2013         };
2014         unsigned long timestamp = jiffies;
2015         int status;
2016
2017         nfs_fattr_init(fattr);
2018
2019         if (state != NULL) {
2020                 struct nfs_lockowner lockowner = {
2021                         .l_owner = current->files,
2022                         .l_pid = current->tgid,
2023                 };
2024                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2025                                 &lockowner);
2026         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2027                                 FMODE_WRITE)) {
2028                 /* Use that stateid */
2029         } else
2030                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2031
2032         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2033         if (status == 0 && state != NULL)
2034                 renew_lease(server, timestamp);
2035         return status;
2036 }
2037
2038 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2039                            struct nfs_fattr *fattr, struct iattr *sattr,
2040                            struct nfs4_state *state)
2041 {
2042         struct nfs_server *server = NFS_SERVER(inode);
2043         struct nfs4_exception exception = {
2044                 .state = state,
2045                 .inode = inode,
2046         };
2047         int err;
2048         do {
2049                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2050                 switch (err) {
2051                 case -NFS4ERR_OPENMODE:
2052                         if (state && !(state->state & FMODE_WRITE)) {
2053                                 err = -EBADF;
2054                                 if (sattr->ia_valid & ATTR_OPEN)
2055                                         err = -EACCES;
2056                                 goto out;
2057                         }
2058                 }
2059                 err = nfs4_handle_exception(server, err, &exception);
2060         } while (exception.retry);
2061 out:
2062         return err;
2063 }
2064
2065 struct nfs4_closedata {
2066         struct inode *inode;
2067         struct nfs4_state *state;
2068         struct nfs_closeargs arg;
2069         struct nfs_closeres res;
2070         struct nfs_fattr fattr;
2071         unsigned long timestamp;
2072         bool roc;
2073         u32 roc_barrier;
2074 };
2075
2076 static void nfs4_free_closedata(void *data)
2077 {
2078         struct nfs4_closedata *calldata = data;
2079         struct nfs4_state_owner *sp = calldata->state->owner;
2080         struct super_block *sb = calldata->state->inode->i_sb;
2081
2082         if (calldata->roc)
2083                 pnfs_roc_release(calldata->state->inode);
2084         nfs4_put_open_state(calldata->state);
2085         nfs_free_seqid(calldata->arg.seqid);
2086         nfs4_put_state_owner(sp);
2087         nfs_sb_deactive_async(sb);
2088         kfree(calldata);
2089 }
2090
2091 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2092                 fmode_t fmode)
2093 {
2094         spin_lock(&state->owner->so_lock);
2095         if (!(fmode & FMODE_READ))
2096                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2097         if (!(fmode & FMODE_WRITE))
2098                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2099         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2100         spin_unlock(&state->owner->so_lock);
2101 }
2102
2103 static void nfs4_close_done(struct rpc_task *task, void *data)
2104 {
2105         struct nfs4_closedata *calldata = data;
2106         struct nfs4_state *state = calldata->state;
2107         struct nfs_server *server = NFS_SERVER(calldata->inode);
2108
2109         dprintk("%s: begin!\n", __func__);
2110         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2111                 return;
2112         /* hmm. we are done with the inode, and in the process of freeing
2113          * the state_owner. we keep this around to process errors
2114          */
2115         switch (task->tk_status) {
2116                 case 0:
2117                         if (calldata->roc)
2118                                 pnfs_roc_set_barrier(state->inode,
2119                                                      calldata->roc_barrier);
2120                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2121                         renew_lease(server, calldata->timestamp);
2122                         nfs4_close_clear_stateid_flags(state,
2123                                         calldata->arg.fmode);
2124                         break;
2125                 case -NFS4ERR_STALE_STATEID:
2126                 case -NFS4ERR_OLD_STATEID:
2127                 case -NFS4ERR_BAD_STATEID:
2128                 case -NFS4ERR_EXPIRED:
2129                         if (calldata->arg.fmode == 0)
2130                                 break;
2131                 default:
2132                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2133                                 rpc_restart_call_prepare(task);
2134         }
2135         nfs_release_seqid(calldata->arg.seqid);
2136         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2137         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2138 }
2139
2140 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2141 {
2142         struct nfs4_closedata *calldata = data;
2143         struct nfs4_state *state = calldata->state;
2144         struct inode *inode = calldata->inode;
2145         int call_close = 0;
2146
2147         dprintk("%s: begin!\n", __func__);
2148         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2149                 return;
2150
2151         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2152         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2153         spin_lock(&state->owner->so_lock);
2154         /* Calculate the change in open mode */
2155         if (state->n_rdwr == 0) {
2156                 if (state->n_rdonly == 0) {
2157                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2158                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2159                         calldata->arg.fmode &= ~FMODE_READ;
2160                 }
2161                 if (state->n_wronly == 0) {
2162                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2163                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2164                         calldata->arg.fmode &= ~FMODE_WRITE;
2165                 }
2166         }
2167         spin_unlock(&state->owner->so_lock);
2168
2169         if (!call_close) {
2170                 /* Note: exit _without_ calling nfs4_close_done */
2171                 task->tk_action = NULL;
2172                 nfs4_sequence_done(task, &calldata->res.seq_res);
2173                 goto out;
2174         }
2175
2176         if (calldata->arg.fmode == 0) {
2177                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2178                 if (calldata->roc &&
2179                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2180                         goto out;
2181         }
2182
2183         nfs_fattr_init(calldata->res.fattr);
2184         calldata->timestamp = jiffies;
2185         if (nfs4_setup_sequence(NFS_SERVER(inode),
2186                                 &calldata->arg.seq_args,
2187                                 &calldata->res.seq_res,
2188                                 task) != 0)
2189                 nfs_release_seqid(calldata->arg.seqid);
2190 out:
2191         dprintk("%s: done!\n", __func__);
2192 }
2193
2194 static const struct rpc_call_ops nfs4_close_ops = {
2195         .rpc_call_prepare = nfs4_close_prepare,
2196         .rpc_call_done = nfs4_close_done,
2197         .rpc_release = nfs4_free_closedata,
2198 };
2199
2200 /*
2201  * It is possible for data to be read/written from a mem-mapped file
2202  * after the sys_close call (which hits the vfs layer as a flush).
2203  * This means that we can't safely call nfsv4 close on a file until
2204  * the inode is cleared. This in turn means that we are not good
2205  * NFSv4 citizens - we do not indicate to the server to update the file's
2206  * share state even when we are done with one of the three share
2207  * stateid's in the inode.
2208  *
2209  * NOTE: Caller must be holding the sp->so_owner semaphore!
2210  */
2211 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2212 {
2213         struct nfs_server *server = NFS_SERVER(state->inode);
2214         struct nfs4_closedata *calldata;
2215         struct nfs4_state_owner *sp = state->owner;
2216         struct rpc_task *task;
2217         struct rpc_message msg = {
2218                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2219                 .rpc_cred = state->owner->so_cred,
2220         };
2221         struct rpc_task_setup task_setup_data = {
2222                 .rpc_client = server->client,
2223                 .rpc_message = &msg,
2224                 .callback_ops = &nfs4_close_ops,
2225                 .workqueue = nfsiod_workqueue,
2226                 .flags = RPC_TASK_ASYNC,
2227         };
2228         int status = -ENOMEM;
2229
2230         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2231         if (calldata == NULL)
2232                 goto out;
2233         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2234         calldata->inode = state->inode;
2235         calldata->state = state;
2236         calldata->arg.fh = NFS_FH(state->inode);
2237         calldata->arg.stateid = &state->open_stateid;
2238         /* Serialization for the sequence id */
2239         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2240         if (calldata->arg.seqid == NULL)
2241                 goto out_free_calldata;
2242         calldata->arg.fmode = 0;
2243         calldata->arg.bitmask = server->cache_consistency_bitmask;
2244         calldata->res.fattr = &calldata->fattr;
2245         calldata->res.seqid = calldata->arg.seqid;
2246         calldata->res.server = server;
2247         calldata->roc = pnfs_roc(state->inode);
2248         nfs_sb_active(calldata->inode->i_sb);
2249
2250         msg.rpc_argp = &calldata->arg;
2251         msg.rpc_resp = &calldata->res;
2252         task_setup_data.callback_data = calldata;
2253         task = rpc_run_task(&task_setup_data);
2254         if (IS_ERR(task))
2255                 return PTR_ERR(task);
2256         status = 0;
2257         if (wait)
2258                 status = rpc_wait_for_completion_task(task);
2259         rpc_put_task(task);
2260         return status;
2261 out_free_calldata:
2262         kfree(calldata);
2263 out:
2264         nfs4_put_open_state(state);
2265         nfs4_put_state_owner(sp);
2266         return status;
2267 }
2268
2269 static struct inode *
2270 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2271 {
2272         struct nfs4_state *state;
2273
2274         /* Protect against concurrent sillydeletes */
2275         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2276                              ctx->cred, &ctx->mdsthreshold);
2277         if (IS_ERR(state))
2278                 return ERR_CAST(state);
2279         ctx->state = state;
2280         return igrab(state->inode);
2281 }
2282
2283 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2284 {
2285         if (ctx->state == NULL)
2286                 return;
2287         if (is_sync)
2288                 nfs4_close_sync(ctx->state, ctx->mode);
2289         else
2290                 nfs4_close_state(ctx->state, ctx->mode);
2291 }
2292
2293 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2294 {
2295         struct nfs4_server_caps_arg args = {
2296                 .fhandle = fhandle,
2297         };
2298         struct nfs4_server_caps_res res = {};
2299         struct rpc_message msg = {
2300                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2301                 .rpc_argp = &args,
2302                 .rpc_resp = &res,
2303         };
2304         int status;
2305
2306         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2307         if (status == 0) {
2308                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2309                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2310                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2311                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2312                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2313                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2314                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2315                         server->caps |= NFS_CAP_ACLS;
2316                 if (res.has_links != 0)
2317                         server->caps |= NFS_CAP_HARDLINKS;
2318                 if (res.has_symlinks != 0)
2319                         server->caps |= NFS_CAP_SYMLINKS;
2320                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2321                         server->caps |= NFS_CAP_FILEID;
2322                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2323                         server->caps |= NFS_CAP_MODE;
2324                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2325                         server->caps |= NFS_CAP_NLINK;
2326                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2327                         server->caps |= NFS_CAP_OWNER;
2328                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2329                         server->caps |= NFS_CAP_OWNER_GROUP;
2330                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2331                         server->caps |= NFS_CAP_ATIME;
2332                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2333                         server->caps |= NFS_CAP_CTIME;
2334                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2335                         server->caps |= NFS_CAP_MTIME;
2336
2337                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2338                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2339                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2340                 server->acl_bitmask = res.acl_bitmask;
2341                 server->fh_expire_type = res.fh_expire_type;
2342         }
2343
2344         return status;
2345 }
2346
2347 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2348 {
2349         struct nfs4_exception exception = { };
2350         int err;
2351         do {
2352                 err = nfs4_handle_exception(server,
2353                                 _nfs4_server_capabilities(server, fhandle),
2354                                 &exception);
2355         } while (exception.retry);
2356         return err;
2357 }
2358
2359 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2360                 struct nfs_fsinfo *info)
2361 {
2362         struct nfs4_lookup_root_arg args = {
2363                 .bitmask = nfs4_fattr_bitmap,
2364         };
2365         struct nfs4_lookup_res res = {
2366                 .server = server,
2367                 .fattr = info->fattr,
2368                 .fh = fhandle,
2369         };
2370         struct rpc_message msg = {
2371                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2372                 .rpc_argp = &args,
2373                 .rpc_resp = &res,
2374         };
2375
2376         nfs_fattr_init(info->fattr);
2377         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2378 }
2379
2380 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2381                 struct nfs_fsinfo *info)
2382 {
2383         struct nfs4_exception exception = { };
2384         int err;
2385         do {
2386                 err = _nfs4_lookup_root(server, fhandle, info);
2387                 switch (err) {
2388                 case 0:
2389                 case -NFS4ERR_WRONGSEC:
2390                         goto out;
2391                 default:
2392                         err = nfs4_handle_exception(server, err, &exception);
2393                 }
2394         } while (exception.retry);
2395 out:
2396         return err;
2397 }
2398
2399 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2400                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2401 {
2402         struct rpc_auth *auth;
2403         int ret;
2404
2405         auth = rpcauth_create(flavor, server->client);
2406         if (IS_ERR(auth)) {
2407                 ret = -EIO;
2408                 goto out;
2409         }
2410         ret = nfs4_lookup_root(server, fhandle, info);
2411 out:
2412         return ret;
2413 }
2414
2415 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2416                               struct nfs_fsinfo *info)
2417 {
2418         int i, len, status = 0;
2419         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2420
2421         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2422         if (len < 0)
2423                 return len;
2424
2425         for (i = 0; i < len; i++) {
2426                 /* AUTH_UNIX is the default flavor if none was specified,
2427                  * thus has already been tried. */
2428                 if (flav_array[i] == RPC_AUTH_UNIX)
2429                         continue;
2430
2431                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2432                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2433                         continue;
2434                 break;
2435         }
2436         /*
2437          * -EACCESS could mean that the user doesn't have correct permissions
2438          * to access the mount.  It could also mean that we tried to mount
2439          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2440          * existing mount programs don't handle -EACCES very well so it should
2441          * be mapped to -EPERM instead.
2442          */
2443         if (status == -EACCES)
2444                 status = -EPERM;
2445         return status;
2446 }
2447
2448 /*
2449  * get the file handle for the "/" directory on the server
2450  */
2451 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2452                          struct nfs_fsinfo *info)
2453 {
2454         int minor_version = server->nfs_client->cl_minorversion;
2455         int status = nfs4_lookup_root(server, fhandle, info);
2456         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2457                 /*
2458                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2459                  * by nfs4_map_errors() as this function exits.
2460                  */
2461                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2462         if (status == 0)
2463                 status = nfs4_server_capabilities(server, fhandle);
2464         if (status == 0)
2465                 status = nfs4_do_fsinfo(server, fhandle, info);
2466         return nfs4_map_errors(status);
2467 }
2468
2469 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2470                               struct nfs_fsinfo *info)
2471 {
2472         int error;
2473         struct nfs_fattr *fattr = info->fattr;
2474
2475         error = nfs4_server_capabilities(server, mntfh);
2476         if (error < 0) {
2477                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2478                 return error;
2479         }
2480
2481         error = nfs4_proc_getattr(server, mntfh, fattr);
2482         if (error < 0) {
2483                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2484                 return error;
2485         }
2486
2487         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2488             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2489                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2490
2491         return error;
2492 }
2493
2494 /*
2495  * Get locations and (maybe) other attributes of a referral.
2496  * Note that we'll actually follow the referral later when
2497  * we detect fsid mismatch in inode revalidation
2498  */
2499 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2500                              const struct qstr *name, struct nfs_fattr *fattr,
2501                              struct nfs_fh *fhandle)
2502 {
2503         int status = -ENOMEM;
2504         struct page *page = NULL;
2505         struct nfs4_fs_locations *locations = NULL;
2506
2507         page = alloc_page(GFP_KERNEL);
2508         if (page == NULL)
2509                 goto out;
2510         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2511         if (locations == NULL)
2512                 goto out;
2513
2514         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2515         if (status != 0)
2516                 goto out;
2517         /* Make sure server returned a different fsid for the referral */
2518         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2519                 dprintk("%s: server did not return a different fsid for"
2520                         " a referral at %s\n", __func__, name->name);
2521                 status = -EIO;
2522                 goto out;
2523         }
2524         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2525         nfs_fixup_referral_attributes(&locations->fattr);
2526
2527         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2528         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2529         memset(fhandle, 0, sizeof(struct nfs_fh));
2530 out:
2531         if (page)
2532                 __free_page(page);
2533         kfree(locations);
2534         return status;
2535 }
2536
2537 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2538 {
2539         struct nfs4_getattr_arg args = {
2540                 .fh = fhandle,
2541                 .bitmask = server->attr_bitmask,
2542         };
2543         struct nfs4_getattr_res res = {
2544                 .fattr = fattr,
2545                 .server = server,
2546         };
2547         struct rpc_message msg = {
2548                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2549                 .rpc_argp = &args,
2550                 .rpc_resp = &res,
2551         };
2552
2553         nfs_fattr_init(fattr);
2554         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2555 }
2556
2557 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2558 {
2559         struct nfs4_exception exception = { };
2560         int err;
2561         do {
2562                 err = nfs4_handle_exception(server,
2563                                 _nfs4_proc_getattr(server, fhandle, fattr),
2564                                 &exception);
2565         } while (exception.retry);
2566         return err;
2567 }
2568
2569 /*
2570  * The file is not closed if it is opened due to the a request to change
2571  * the size of the file. The open call will not be needed once the
2572  * VFS layer lookup-intents are implemented.
2573  *
2574  * Close is called when the inode is destroyed.
2575  * If we haven't opened the file for O_WRONLY, we
2576  * need to in the size_change case to obtain a stateid.
2577  *
2578  * Got race?
2579  * Because OPEN is always done by name in nfsv4, it is
2580  * possible that we opened a different file by the same
2581  * name.  We can recognize this race condition, but we
2582  * can't do anything about it besides returning an error.
2583  *
2584  * This will be fixed with VFS changes (lookup-intent).
2585  */
2586 static int
2587 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2588                   struct iattr *sattr)
2589 {
2590         struct inode *inode = dentry->d_inode;
2591         struct rpc_cred *cred = NULL;
2592         struct nfs4_state *state = NULL;
2593         int status;
2594
2595         if (pnfs_ld_layoutret_on_setattr(inode))
2596                 pnfs_return_layout(inode);
2597
2598         nfs_fattr_init(fattr);
2599
2600         /* Deal with open(O_TRUNC) */
2601         if (sattr->ia_valid & ATTR_OPEN)
2602                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2603
2604         /* Optimization: if the end result is no change, don't RPC */
2605         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2606                 return 0;
2607
2608         /* Search for an existing open(O_WRITE) file */
2609         if (sattr->ia_valid & ATTR_FILE) {
2610                 struct nfs_open_context *ctx;
2611
2612                 ctx = nfs_file_open_context(sattr->ia_file);
2613                 if (ctx) {
2614                         cred = ctx->cred;
2615                         state = ctx->state;
2616                 }
2617         }
2618
2619         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2620         if (status == 0)
2621                 nfs_setattr_update_inode(inode, sattr);
2622         return status;
2623 }
2624
2625 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2626                 const struct qstr *name, struct nfs_fh *fhandle,
2627                 struct nfs_fattr *fattr)
2628 {
2629         struct nfs_server *server = NFS_SERVER(dir);
2630         int                    status;
2631         struct nfs4_lookup_arg args = {
2632                 .bitmask = server->attr_bitmask,
2633                 .dir_fh = NFS_FH(dir),
2634                 .name = name,
2635         };
2636         struct nfs4_lookup_res res = {
2637                 .server = server,
2638                 .fattr = fattr,
2639                 .fh = fhandle,
2640         };
2641         struct rpc_message msg = {
2642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2643                 .rpc_argp = &args,
2644                 .rpc_resp = &res,
2645         };
2646
2647         nfs_fattr_init(fattr);
2648
2649         dprintk("NFS call  lookup %s\n", name->name);
2650         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2651         dprintk("NFS reply lookup: %d\n", status);
2652         return status;
2653 }
2654
2655 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2656 {
2657         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2658                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2659         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2660         fattr->nlink = 2;
2661 }
2662
2663 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2664                                    struct qstr *name, struct nfs_fh *fhandle,
2665                                    struct nfs_fattr *fattr)
2666 {
2667         struct nfs4_exception exception = { };
2668         struct rpc_clnt *client = *clnt;
2669         int err;
2670         do {
2671                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2672                 switch (err) {
2673                 case -NFS4ERR_BADNAME:
2674                         err = -ENOENT;
2675                         goto out;
2676                 case -NFS4ERR_MOVED:
2677                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2678                         goto out;
2679                 case -NFS4ERR_WRONGSEC:
2680                         err = -EPERM;
2681                         if (client != *clnt)
2682                                 goto out;
2683
2684                         client = nfs4_create_sec_client(client, dir, name);
2685                         if (IS_ERR(client))
2686                                 return PTR_ERR(client);
2687
2688                         exception.retry = 1;
2689                         break;
2690                 default:
2691                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2692                 }
2693         } while (exception.retry);
2694
2695 out:
2696         if (err == 0)
2697                 *clnt = client;
2698         else if (client != *clnt)
2699                 rpc_shutdown_client(client);
2700
2701         return err;
2702 }
2703
2704 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2705                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2706 {
2707         int status;
2708         struct rpc_clnt *client = NFS_CLIENT(dir);
2709
2710         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2711         if (client != NFS_CLIENT(dir)) {
2712                 rpc_shutdown_client(client);
2713                 nfs_fixup_secinfo_attributes(fattr);
2714         }
2715         return status;
2716 }
2717
2718 struct rpc_clnt *
2719 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2720                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2721 {
2722         int status;
2723         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2724
2725         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2726         if (status < 0) {
2727                 rpc_shutdown_client(client);
2728                 return ERR_PTR(status);
2729         }
2730         return client;
2731 }
2732
2733 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2734 {
2735         struct nfs_server *server = NFS_SERVER(inode);
2736         struct nfs4_accessargs args = {
2737                 .fh = NFS_FH(inode),
2738                 .bitmask = server->cache_consistency_bitmask,
2739         };
2740         struct nfs4_accessres res = {
2741                 .server = server,
2742         };
2743         struct rpc_message msg = {
2744                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2745                 .rpc_argp = &args,
2746                 .rpc_resp = &res,
2747                 .rpc_cred = entry->cred,
2748         };
2749         int mode = entry->mask;
2750         int status;
2751
2752         /*
2753          * Determine which access bits we want to ask for...
2754          */
2755         if (mode & MAY_READ)
2756                 args.access |= NFS4_ACCESS_READ;
2757         if (S_ISDIR(inode->i_mode)) {
2758                 if (mode & MAY_WRITE)
2759                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2760                 if (mode & MAY_EXEC)
2761                         args.access |= NFS4_ACCESS_LOOKUP;
2762         } else {
2763                 if (mode & MAY_WRITE)
2764                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2765                 if (mode & MAY_EXEC)
2766                         args.access |= NFS4_ACCESS_EXECUTE;
2767         }
2768
2769         res.fattr = nfs_alloc_fattr();
2770         if (res.fattr == NULL)
2771                 return -ENOMEM;
2772
2773         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2774         if (!status) {
2775                 nfs_access_set_mask(entry, res.access);
2776                 nfs_refresh_inode(inode, res.fattr);
2777         }
2778         nfs_free_fattr(res.fattr);
2779         return status;
2780 }
2781
2782 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2783 {
2784         struct nfs4_exception exception = { };
2785         int err;
2786         do {
2787                 err = nfs4_handle_exception(NFS_SERVER(inode),
2788                                 _nfs4_proc_access(inode, entry),
2789                                 &exception);
2790         } while (exception.retry);
2791         return err;
2792 }
2793
2794 /*
2795  * TODO: For the time being, we don't try to get any attributes
2796  * along with any of the zero-copy operations READ, READDIR,
2797  * READLINK, WRITE.
2798  *
2799  * In the case of the first three, we want to put the GETATTR
2800  * after the read-type operation -- this is because it is hard
2801  * to predict the length of a GETATTR response in v4, and thus
2802  * align the READ data correctly.  This means that the GETATTR
2803  * may end up partially falling into the page cache, and we should
2804  * shift it into the 'tail' of the xdr_buf before processing.
2805  * To do this efficiently, we need to know the total length
2806  * of data received, which doesn't seem to be available outside
2807  * of the RPC layer.
2808  *
2809  * In the case of WRITE, we also want to put the GETATTR after
2810  * the operation -- in this case because we want to make sure
2811  * we get the post-operation mtime and size.
2812  *
2813  * Both of these changes to the XDR layer would in fact be quite
2814  * minor, but I decided to leave them for a subsequent patch.
2815  */
2816 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2817                 unsigned int pgbase, unsigned int pglen)
2818 {
2819         struct nfs4_readlink args = {
2820                 .fh       = NFS_FH(inode),
2821                 .pgbase   = pgbase,
2822                 .pglen    = pglen,
2823                 .pages    = &page,
2824         };
2825         struct nfs4_readlink_res res;
2826         struct rpc_message msg = {
2827                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2828                 .rpc_argp = &args,
2829                 .rpc_resp = &res,
2830         };
2831
2832         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2833 }
2834
2835 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2836                 unsigned int pgbase, unsigned int pglen)
2837 {
2838         struct nfs4_exception exception = { };
2839         int err;
2840         do {
2841                 err = nfs4_handle_exception(NFS_SERVER(inode),
2842                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2843                                 &exception);
2844         } while (exception.retry);
2845         return err;
2846 }
2847
2848 /*
2849  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2850  */
2851 static int
2852 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2853                  int flags)
2854 {
2855         struct nfs_open_context *ctx;
2856         struct nfs4_state *state;
2857         int status = 0;
2858
2859         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2860         if (IS_ERR(ctx))
2861                 return PTR_ERR(ctx);
2862
2863         sattr->ia_mode &= ~current_umask();
2864         state = nfs4_do_open(dir, dentry, ctx->mode,
2865                         flags, sattr, ctx->cred,
2866                         &ctx->mdsthreshold);
2867         d_drop(dentry);
2868         if (IS_ERR(state)) {
2869                 status = PTR_ERR(state);
2870                 goto out;
2871         }
2872         d_add(dentry, igrab(state->inode));
2873         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2874         ctx->state = state;
2875 out:
2876         put_nfs_open_context(ctx);
2877         return status;
2878 }
2879
2880 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2881 {
2882         struct nfs_server *server = NFS_SERVER(dir);
2883         struct nfs_removeargs args = {
2884                 .fh = NFS_FH(dir),
2885                 .name = *name,
2886         };
2887         struct nfs_removeres res = {
2888                 .server = server,
2889         };
2890         struct rpc_message msg = {
2891                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2892                 .rpc_argp = &args,
2893                 .rpc_resp = &res,
2894         };
2895         int status;
2896
2897         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2898         if (status == 0)
2899                 update_changeattr(dir, &res.cinfo);
2900         return status;
2901 }
2902
2903 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2904 {
2905         struct nfs4_exception exception = { };
2906         int err;
2907         do {
2908                 err = nfs4_handle_exception(NFS_SERVER(dir),
2909                                 _nfs4_proc_remove(dir, name),
2910                                 &exception);
2911         } while (exception.retry);
2912         return err;
2913 }
2914
2915 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2916 {
2917         struct nfs_server *server = NFS_SERVER(dir);
2918         struct nfs_removeargs *args = msg->rpc_argp;
2919         struct nfs_removeres *res = msg->rpc_resp;
2920
2921         res->server = server;
2922         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2923         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2924 }
2925
2926 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2927 {
2928         nfs4_setup_sequence(NFS_SERVER(data->dir),
2929                         &data->args.seq_args,
2930                         &data->res.seq_res,
2931                         task);
2932 }
2933
2934 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2935 {
2936         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2937
2938         if (!nfs4_sequence_done(task, &res->seq_res))
2939                 return 0;
2940         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2941                 return 0;
2942         update_changeattr(dir, &res->cinfo);
2943         return 1;
2944 }
2945
2946 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2947 {
2948         struct nfs_server *server = NFS_SERVER(dir);
2949         struct nfs_renameargs *arg = msg->rpc_argp;
2950         struct nfs_renameres *res = msg->rpc_resp;
2951
2952         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2953         res->server = server;
2954         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2955 }
2956
2957 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2958 {
2959         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2960                         &data->args.seq_args,
2961                         &data->res.seq_res,
2962                         task);
2963 }
2964
2965 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2966                                  struct inode *new_dir)
2967 {
2968         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2969
2970         if (!nfs4_sequence_done(task, &res->seq_res))
2971                 return 0;
2972         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2973                 return 0;
2974
2975         update_changeattr(old_dir, &res->old_cinfo);
2976         update_changeattr(new_dir, &res->new_cinfo);
2977         return 1;
2978 }
2979
2980 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2981                 struct inode *new_dir, struct qstr *new_name)
2982 {
2983         struct nfs_server *server = NFS_SERVER(old_dir);
2984         struct nfs_renameargs arg = {
2985                 .old_dir = NFS_FH(old_dir),
2986                 .new_dir = NFS_FH(new_dir),
2987                 .old_name = old_name,
2988                 .new_name = new_name,
2989         };
2990         struct nfs_renameres res = {
2991                 .server = server,
2992         };
2993         struct rpc_message msg = {
2994                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2995                 .rpc_argp = &arg,
2996                 .rpc_resp = &res,
2997         };
2998         int status = -ENOMEM;
2999
3000         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3001         if (!status) {
3002                 update_changeattr(old_dir, &res.old_cinfo);
3003                 update_changeattr(new_dir, &res.new_cinfo);
3004         }
3005         return status;
3006 }
3007
3008 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3009                 struct inode *new_dir, struct qstr *new_name)
3010 {
3011         struct nfs4_exception exception = { };
3012         int err;
3013         do {
3014                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3015                                 _nfs4_proc_rename(old_dir, old_name,
3016                                         new_dir, new_name),
3017                                 &exception);
3018         } while (exception.retry);
3019         return err;
3020 }
3021
3022 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3023 {
3024         struct nfs_server *server = NFS_SERVER(inode);
3025         struct nfs4_link_arg arg = {
3026                 .fh     = NFS_FH(inode),
3027                 .dir_fh = NFS_FH(dir),
3028                 .name   = name,
3029                 .bitmask = server->attr_bitmask,
3030         };
3031         struct nfs4_link_res res = {
3032                 .server = server,
3033         };
3034         struct rpc_message msg = {
3035                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3036                 .rpc_argp = &arg,
3037                 .rpc_resp = &res,
3038         };
3039         int status = -ENOMEM;
3040
3041         res.fattr = nfs_alloc_fattr();
3042         if (res.fattr == NULL)
3043                 goto out;
3044
3045         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3046         if (!status) {
3047                 update_changeattr(dir, &res.cinfo);
3048                 nfs_post_op_update_inode(inode, res.fattr);
3049         }
3050 out:
3051         nfs_free_fattr(res.fattr);
3052         return status;
3053 }
3054
3055 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3056 {
3057         struct nfs4_exception exception = { };
3058         int err;
3059         do {
3060                 err = nfs4_handle_exception(NFS_SERVER(inode),
3061                                 _nfs4_proc_link(inode, dir, name),
3062                                 &exception);
3063         } while (exception.retry);
3064         return err;
3065 }
3066
3067 struct nfs4_createdata {
3068         struct rpc_message msg;
3069         struct nfs4_create_arg arg;
3070         struct nfs4_create_res res;
3071         struct nfs_fh fh;
3072         struct nfs_fattr fattr;
3073 };
3074
3075 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3076                 struct qstr *name, struct iattr *sattr, u32 ftype)
3077 {
3078         struct nfs4_createdata *data;
3079
3080         data = kzalloc(sizeof(*data), GFP_KERNEL);
3081         if (data != NULL) {
3082                 struct nfs_server *server = NFS_SERVER(dir);
3083
3084                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3085                 data->msg.rpc_argp = &data->arg;
3086                 data->msg.rpc_resp = &data->res;
3087                 data->arg.dir_fh = NFS_FH(dir);
3088                 data->arg.server = server;
3089                 data->arg.name = name;
3090                 data->arg.attrs = sattr;
3091                 data->arg.ftype = ftype;
3092                 data->arg.bitmask = server->attr_bitmask;
3093                 data->res.server = server;
3094                 data->res.fh = &data->fh;
3095                 data->res.fattr = &data->fattr;
3096                 nfs_fattr_init(data->res.fattr);
3097         }
3098         return data;
3099 }
3100
3101 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3102 {
3103         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3104                                     &data->arg.seq_args, &data->res.seq_res, 1);
3105         if (status == 0) {
3106                 update_changeattr(dir, &data->res.dir_cinfo);
3107                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3108         }
3109         return status;
3110 }
3111
3112 static void nfs4_free_createdata(struct nfs4_createdata *data)
3113 {
3114         kfree(data);
3115 }
3116
3117 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3118                 struct page *page, unsigned int len, struct iattr *sattr)
3119 {
3120         struct nfs4_createdata *data;
3121         int status = -ENAMETOOLONG;
3122
3123         if (len > NFS4_MAXPATHLEN)
3124                 goto out;
3125
3126         status = -ENOMEM;
3127         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3128         if (data == NULL)
3129                 goto out;
3130
3131         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3132         data->arg.u.symlink.pages = &page;
3133         data->arg.u.symlink.len = len;
3134
3135         status = nfs4_do_create(dir, dentry, data);
3136
3137         nfs4_free_createdata(data);
3138 out:
3139         return status;
3140 }
3141
3142 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3143                 struct page *page, unsigned int len, struct iattr *sattr)
3144 {
3145         struct nfs4_exception exception = { };
3146         int err;
3147         do {
3148                 err = nfs4_handle_exception(NFS_SERVER(dir),
3149                                 _nfs4_proc_symlink(dir, dentry, page,
3150                                                         len, sattr),
3151                                 &exception);
3152         } while (exception.retry);
3153         return err;
3154 }
3155
3156 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3157                 struct iattr *sattr)
3158 {
3159         struct nfs4_createdata *data;
3160         int status = -ENOMEM;
3161
3162         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3163         if (data == NULL)
3164                 goto out;
3165
3166         status = nfs4_do_create(dir, dentry, data);
3167
3168         nfs4_free_createdata(data);
3169 out:
3170         return status;
3171 }
3172
3173 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3174                 struct iattr *sattr)
3175 {
3176         struct nfs4_exception exception = { };
3177         int err;
3178
3179         sattr->ia_mode &= ~current_umask();
3180         do {
3181                 err = nfs4_handle_exception(NFS_SERVER(dir),
3182                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3183                                 &exception);
3184         } while (exception.retry);
3185         return err;
3186 }
3187
3188 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3189                 u64 cookie, struct page **pages, unsigned int count, int plus)
3190 {
3191         struct inode            *dir = dentry->d_inode;
3192         struct nfs4_readdir_arg args = {
3193                 .fh = NFS_FH(dir),
3194                 .pages = pages,
3195                 .pgbase = 0,
3196                 .count = count,
3197                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3198                 .plus = plus,
3199         };
3200         struct nfs4_readdir_res res;
3201         struct rpc_message msg = {
3202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3203                 .rpc_argp = &args,
3204                 .rpc_resp = &res,
3205                 .rpc_cred = cred,
3206         };
3207         int                     status;
3208
3209         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3210                         dentry->d_parent->d_name.name,
3211                         dentry->d_name.name,
3212                         (unsigned long long)cookie);
3213         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3214         res.pgbase = args.pgbase;
3215         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3216         if (status >= 0) {
3217                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3218                 status += args.pgbase;
3219         }
3220
3221         nfs_invalidate_atime(dir);
3222
3223         dprintk("%s: returns %d\n", __func__, status);
3224         return status;
3225 }
3226
3227 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3228                 u64 cookie, struct page **pages, unsigned int count, int plus)
3229 {
3230         struct nfs4_exception exception = { };
3231         int err;
3232         do {
3233                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3234                                 _nfs4_proc_readdir(dentry, cred, cookie,
3235                                         pages, count, plus),
3236                                 &exception);
3237         } while (exception.retry);
3238         return err;
3239 }
3240
3241 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3242                 struct iattr *sattr, dev_t rdev)
3243 {
3244         struct nfs4_createdata *data;
3245         int mode = sattr->ia_mode;
3246         int status = -ENOMEM;
3247
3248         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3249         if (data == NULL)
3250                 goto out;
3251
3252         if (S_ISFIFO(mode))
3253                 data->arg.ftype = NF4FIFO;
3254         else if (S_ISBLK(mode)) {
3255                 data->arg.ftype = NF4BLK;
3256                 data->arg.u.device.specdata1 = MAJOR(rdev);
3257                 data->arg.u.device.specdata2 = MINOR(rdev);
3258         }
3259         else if (S_ISCHR(mode)) {
3260                 data->arg.ftype = NF4CHR;
3261                 data->arg.u.device.specdata1 = MAJOR(rdev);
3262                 data->arg.u.device.specdata2 = MINOR(rdev);
3263         } else if (!S_ISSOCK(mode)) {
3264                 status = -EINVAL;
3265                 goto out_free;
3266         }
3267
3268         status = nfs4_do_create(dir, dentry, data);
3269 out_free:
3270         nfs4_free_createdata(data);
3271 out:
3272         return status;
3273 }
3274
3275 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3276                 struct iattr *sattr, dev_t rdev)
3277 {
3278         struct nfs4_exception exception = { };
3279         int err;
3280
3281         sattr->ia_mode &= ~current_umask();
3282         do {
3283                 err = nfs4_handle_exception(NFS_SERVER(dir),
3284                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3285                                 &exception);
3286         } while (exception.retry);
3287         return err;
3288 }
3289
3290 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3291                  struct nfs_fsstat *fsstat)
3292 {
3293         struct nfs4_statfs_arg args = {
3294                 .fh = fhandle,
3295                 .bitmask = server->attr_bitmask,
3296         };
3297         struct nfs4_statfs_res res = {
3298                 .fsstat = fsstat,
3299         };
3300         struct rpc_message msg = {
3301                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3302                 .rpc_argp = &args,
3303                 .rpc_resp = &res,
3304         };
3305
3306         nfs_fattr_init(fsstat->fattr);
3307         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3308 }
3309
3310 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3311 {
3312         struct nfs4_exception exception = { };
3313         int err;
3314         do {
3315                 err = nfs4_handle_exception(server,
3316                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3317                                 &exception);
3318         } while (exception.retry);
3319         return err;
3320 }
3321
3322 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3323                 struct nfs_fsinfo *fsinfo)
3324 {
3325         struct nfs4_fsinfo_arg args = {
3326                 .fh = fhandle,
3327                 .bitmask = server->attr_bitmask,
3328         };
3329         struct nfs4_fsinfo_res res = {
3330                 .fsinfo = fsinfo,
3331         };
3332         struct rpc_message msg = {
3333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3334                 .rpc_argp = &args,
3335                 .rpc_resp = &res,
3336         };
3337
3338         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3339 }
3340
3341 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3342 {
3343         struct nfs4_exception exception = { };
3344         int err;
3345
3346         do {
3347                 err = nfs4_handle_exception(server,
3348                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3349                                 &exception);
3350         } while (exception.retry);
3351         return err;
3352 }
3353
3354 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3355 {
3356         int error;
3357
3358         nfs_fattr_init(fsinfo->fattr);
3359         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3360         if (error == 0) {
3361                 /* block layout checks this! */
3362                 server->pnfs_blksize = fsinfo->blksize;
3363                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3364         }
3365
3366         return error;
3367 }
3368
3369 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3370                 struct nfs_pathconf *pathconf)
3371 {
3372         struct nfs4_pathconf_arg args = {
3373                 .fh = fhandle,
3374                 .bitmask = server->attr_bitmask,
3375         };
3376         struct nfs4_pathconf_res res = {
3377                 .pathconf = pathconf,
3378         };
3379         struct rpc_message msg = {
3380                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3381                 .rpc_argp = &args,
3382                 .rpc_resp = &res,
3383         };
3384
3385         /* None of the pathconf attributes are mandatory to implement */
3386         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3387                 memset(pathconf, 0, sizeof(*pathconf));
3388                 return 0;
3389         }
3390
3391         nfs_fattr_init(pathconf->fattr);
3392         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3393 }
3394
3395 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3396                 struct nfs_pathconf *pathconf)
3397 {
3398         struct nfs4_exception exception = { };
3399         int err;
3400
3401         do {
3402                 err = nfs4_handle_exception(server,
3403                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3404                                 &exception);
3405         } while (exception.retry);
3406         return err;
3407 }
3408
3409 void __nfs4_read_done_cb(struct nfs_read_data *data)
3410 {
3411         nfs_invalidate_atime(data->header->inode);
3412 }
3413
3414 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3415 {
3416         struct nfs_server *server = NFS_SERVER(data->header->inode);
3417
3418         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3419                 rpc_restart_call_prepare(task);
3420                 return -EAGAIN;
3421         }
3422
3423         __nfs4_read_done_cb(data);
3424         if (task->tk_status > 0)
3425                 renew_lease(server, data->timestamp);
3426         return 0;
3427 }
3428
3429 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3430 {
3431
3432         dprintk("--> %s\n", __func__);
3433
3434         if (!nfs4_sequence_done(task, &data->res.seq_res))
3435                 return -EAGAIN;
3436
3437         return data->read_done_cb ? data->read_done_cb(task, data) :
3438                                     nfs4_read_done_cb(task, data);
3439 }
3440
3441 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3442 {
3443         data->timestamp   = jiffies;
3444         data->read_done_cb = nfs4_read_done_cb;
3445         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3446         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3447 }
3448
3449 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3450 {
3451         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3452                         &data->args.seq_args,
3453                         &data->res.seq_res,
3454                         task);
3455 }
3456
3457 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3458 {
3459         struct inode *inode = data->header->inode;
3460
3461         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3462                 rpc_restart_call_prepare(task);
3463                 return -EAGAIN;
3464         }
3465         if (task->tk_status >= 0) {
3466                 renew_lease(NFS_SERVER(inode), data->timestamp);
3467                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3468         }
3469         return 0;
3470 }
3471
3472 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3473 {
3474         if (!nfs4_sequence_done(task, &data->res.seq_res))
3475                 return -EAGAIN;
3476         return data->write_done_cb ? data->write_done_cb(task, data) :
3477                 nfs4_write_done_cb(task, data);
3478 }
3479
3480 static
3481 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3482 {
3483         const struct nfs_pgio_header *hdr = data->header;
3484
3485         /* Don't request attributes for pNFS or O_DIRECT writes */
3486         if (data->ds_clp != NULL || hdr->dreq != NULL)
3487                 return false;
3488         /* Otherwise, request attributes if and only if we don't hold
3489          * a delegation
3490          */
3491         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3492 }
3493
3494 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3495 {
3496         struct nfs_server *server = NFS_SERVER(data->header->inode);
3497
3498         if (!nfs4_write_need_cache_consistency_data(data)) {
3499                 data->args.bitmask = NULL;
3500                 data->res.fattr = NULL;
3501         } else
3502                 data->args.bitmask = server->cache_consistency_bitmask;
3503
3504         if (!data->write_done_cb)
3505                 data->write_done_cb = nfs4_write_done_cb;
3506         data->res.server = server;
3507         data->timestamp   = jiffies;
3508
3509         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3510         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3511 }
3512
3513 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3514 {
3515         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3516                         &data->args.seq_args,
3517                         &data->res.seq_res,
3518                         task);
3519 }
3520
3521 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3522 {
3523         nfs4_setup_sequence(NFS_SERVER(data->inode),
3524                         &data->args.seq_args,
3525                         &data->res.seq_res,
3526                         task);
3527 }
3528
3529 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3530 {
3531         struct inode *inode = data->inode;
3532
3533         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3534                 rpc_restart_call_prepare(task);
3535                 return -EAGAIN;
3536         }
3537         return 0;
3538 }
3539
3540 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3541 {
3542         if (!nfs4_sequence_done(task, &data->res.seq_res))
3543                 return -EAGAIN;
3544         return data->commit_done_cb(task, data);
3545 }
3546
3547 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3548 {
3549         struct nfs_server *server = NFS_SERVER(data->inode);
3550
3551         if (data->commit_done_cb == NULL)
3552                 data->commit_done_cb = nfs4_commit_done_cb;
3553         data->res.server = server;
3554         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3555         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3556 }
3557
3558 struct nfs4_renewdata {
3559         struct nfs_client       *client;
3560         unsigned long           timestamp;
3561 };
3562
3563 /*
3564  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3565  * standalone procedure for queueing an asynchronous RENEW.
3566  */
3567 static void nfs4_renew_release(void *calldata)
3568 {
3569         struct nfs4_renewdata *data = calldata;
3570         struct nfs_client *clp = data->client;
3571
3572         if (atomic_read(&clp->cl_count) > 1)
3573                 nfs4_schedule_state_renewal(clp);
3574         nfs_put_client(clp);
3575         kfree(data);
3576 }
3577
3578 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3579 {
3580         struct nfs4_renewdata *data = calldata;
3581         struct nfs_client *clp = data->client;
3582         unsigned long timestamp = data->timestamp;
3583
3584         if (task->tk_status < 0) {
3585                 /* Unless we're shutting down, schedule state recovery! */
3586                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3587                         return;
3588                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3589                         nfs4_schedule_lease_recovery(clp);
3590                         return;
3591                 }
3592                 nfs4_schedule_path_down_recovery(clp);
3593         }
3594         do_renew_lease(clp, timestamp);
3595 }
3596
3597 static const struct rpc_call_ops nfs4_renew_ops = {
3598         .rpc_call_done = nfs4_renew_done,
3599         .rpc_release = nfs4_renew_release,
3600 };
3601
3602 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3603 {
3604         struct rpc_message msg = {
3605                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3606                 .rpc_argp       = clp,
3607                 .rpc_cred       = cred,
3608         };
3609         struct nfs4_renewdata *data;
3610
3611         if (renew_flags == 0)
3612                 return 0;
3613         if (!atomic_inc_not_zero(&clp->cl_count))
3614                 return -EIO;
3615         data = kmalloc(sizeof(*data), GFP_NOFS);
3616         if (data == NULL)
3617                 return -ENOMEM;
3618         data->client = clp;
3619         data->timestamp = jiffies;
3620         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3621                         &nfs4_renew_ops, data);
3622 }
3623
3624 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3625 {
3626         struct rpc_message msg = {
3627                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3628                 .rpc_argp       = clp,
3629                 .rpc_cred       = cred,
3630         };
3631         unsigned long now = jiffies;
3632         int status;
3633
3634         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3635         if (status < 0)
3636                 return status;
3637         do_renew_lease(clp, now);
3638         return 0;
3639 }
3640
3641 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3642 {
3643         return (server->caps & NFS_CAP_ACLS)
3644                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3645                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3646 }
3647
3648 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3649  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3650  * the stack.
3651  */
3652 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3653
3654 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3655                 struct page **pages, unsigned int *pgbase)
3656 {
3657         struct page *newpage, **spages;
3658         int rc = 0;
3659         size_t len;
3660         spages = pages;
3661
3662         do {
3663                 len = min_t(size_t, PAGE_SIZE, buflen);
3664                 newpage = alloc_page(GFP_KERNEL);
3665
3666                 if (newpage == NULL)
3667                         goto unwind;
3668                 memcpy(page_address(newpage), buf, len);
3669                 buf += len;
3670                 buflen -= len;
3671                 *pages++ = newpage;
3672                 rc++;
3673         } while (buflen != 0);
3674
3675         return rc;
3676
3677 unwind:
3678         for(; rc > 0; rc--)
3679                 __free_page(spages[rc-1]);
3680         return -ENOMEM;
3681 }
3682
3683 struct nfs4_cached_acl {
3684         int cached;
3685         size_t len;
3686         char data[0];
3687 };
3688
3689 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3690 {
3691         struct nfs_inode *nfsi = NFS_I(inode);
3692
3693         spin_lock(&inode->i_lock);
3694         kfree(nfsi->nfs4_acl);
3695         nfsi->nfs4_acl = acl;
3696         spin_unlock(&inode->i_lock);
3697 }
3698
3699 static void nfs4_zap_acl_attr(struct inode *inode)
3700 {
3701         nfs4_set_cached_acl(inode, NULL);
3702 }
3703
3704 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3705 {
3706         struct nfs_inode *nfsi = NFS_I(inode);
3707         struct nfs4_cached_acl *acl;
3708         int ret = -ENOENT;
3709
3710         spin_lock(&inode->i_lock);
3711         acl = nfsi->nfs4_acl;
3712         if (acl == NULL)
3713                 goto out;
3714         if (buf == NULL) /* user is just asking for length */
3715                 goto out_len;
3716         if (acl->cached == 0)
3717                 goto out;
3718         ret = -ERANGE; /* see getxattr(2) man page */
3719         if (acl->len > buflen)
3720                 goto out;
3721         memcpy(buf, acl->data, acl->len);
3722 out_len:
3723         ret = acl->len;
3724 out:
3725         spin_unlock(&inode->i_lock);
3726         return ret;
3727 }
3728
3729 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3730 {
3731         struct nfs4_cached_acl *acl;
3732         size_t buflen = sizeof(*acl) + acl_len;
3733
3734         if (buflen <= PAGE_SIZE) {
3735                 acl = kmalloc(buflen, GFP_KERNEL);
3736                 if (acl == NULL)
3737                         goto out;
3738                 acl->cached = 1;
3739                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3740         } else {
3741                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3742                 if (acl == NULL)
3743                         goto out;
3744                 acl->cached = 0;
3745         }
3746         acl->len = acl_len;
3747 out:
3748         nfs4_set_cached_acl(inode, acl);
3749 }
3750
3751 /*
3752  * The getxattr API returns the required buffer length when called with a
3753  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3754  * the required buf.  On a NULL buf, we send a page of data to the server
3755  * guessing that the ACL request can be serviced by a page. If so, we cache
3756  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3757  * the cache. If not so, we throw away the page, and cache the required
3758  * length. The next getxattr call will then produce another round trip to
3759  * the server, this time with the input buf of the required size.
3760  */
3761 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3762 {
3763         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3764         struct nfs_getaclargs args = {
3765                 .fh = NFS_FH(inode),
3766                 .acl_pages = pages,
3767                 .acl_len = buflen,
3768         };
3769         struct nfs_getaclres res = {
3770                 .acl_len = buflen,
3771         };
3772         struct rpc_message msg = {
3773                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3774                 .rpc_argp = &args,
3775                 .rpc_resp = &res,
3776         };
3777         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3778         int ret = -ENOMEM, i;
3779
3780         /* As long as we're doing a round trip to the server anyway,
3781          * let's be prepared for a page of acl data. */
3782         if (npages == 0)
3783                 npages = 1;
3784         if (npages > ARRAY_SIZE(pages))
3785                 return -ERANGE;
3786
3787         for (i = 0; i < npages; i++) {
3788                 pages[i] = alloc_page(GFP_KERNEL);
3789                 if (!pages[i])
3790                         goto out_free;
3791         }
3792
3793         /* for decoding across pages */
3794         res.acl_scratch = alloc_page(GFP_KERNEL);
3795         if (!res.acl_scratch)
3796                 goto out_free;
3797
3798         args.acl_len = npages * PAGE_SIZE;
3799         args.acl_pgbase = 0;
3800
3801         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3802                 __func__, buf, buflen, npages, args.acl_len);
3803         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3804                              &msg, &args.seq_args, &res.seq_res, 0);
3805         if (ret)
3806                 goto out_free;
3807
3808         /* Handle the case where the passed-in buffer is too short */
3809         if (res.acl_flags & NFS4_ACL_TRUNC) {
3810                 /* Did the user only issue a request for the acl length? */
3811                 if (buf == NULL)
3812                         goto out_ok;
3813                 ret = -ERANGE;
3814                 goto out_free;
3815         }
3816         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3817         if (buf) {
3818                 if (res.acl_len > buflen) {
3819                         ret = -ERANGE;
3820                         goto out_free;
3821                 }
3822                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3823         }
3824 out_ok:
3825         ret = res.acl_len;
3826 out_free:
3827         for (i = 0; i < npages; i++)
3828                 if (pages[i])
3829                         __free_page(pages[i]);
3830         if (res.acl_scratch)
3831                 __free_page(res.acl_scratch);
3832         return ret;
3833 }
3834
3835 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3836 {
3837         struct nfs4_exception exception = { };
3838         ssize_t ret;
3839         do {
3840                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3841                 if (ret >= 0)
3842                         break;
3843                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3844         } while (exception.retry);
3845         return ret;
3846 }
3847
3848 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3849 {
3850         struct nfs_server *server = NFS_SERVER(inode);
3851         int ret;
3852
3853         if (!nfs4_server_supports_acls(server))
3854                 return -EOPNOTSUPP;
3855         ret = nfs_revalidate_inode(server, inode);
3856         if (ret < 0)
3857                 return ret;
3858         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3859                 nfs_zap_acl_cache(inode);
3860         ret = nfs4_read_cached_acl(inode, buf, buflen);
3861         if (ret != -ENOENT)
3862                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3863                  * but no cached acl data, just the acl length */
3864                 return ret;
3865         return nfs4_get_acl_uncached(inode, buf, buflen);
3866 }
3867
3868 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3869 {
3870         struct nfs_server *server = NFS_SERVER(inode);
3871         struct page *pages[NFS4ACL_MAXPAGES];
3872         struct nfs_setaclargs arg = {
3873                 .fh             = NFS_FH(inode),
3874                 .acl_pages      = pages,
3875                 .acl_len        = buflen,
3876         };
3877         struct nfs_setaclres res;
3878         struct rpc_message msg = {
3879                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3880                 .rpc_argp       = &arg,
3881                 .rpc_resp       = &res,
3882         };
3883         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3884         int ret, i;
3885
3886         if (!nfs4_server_supports_acls(server))
3887                 return -EOPNOTSUPP;
3888         if (npages > ARRAY_SIZE(pages))
3889                 return -ERANGE;
3890         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3891         if (i < 0)
3892                 return i;
3893         nfs4_inode_return_delegation(inode);
3894         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3895
3896         /*
3897          * Free each page after tx, so the only ref left is
3898          * held by the network stack
3899          */
3900         for (; i > 0; i--)
3901                 put_page(pages[i-1]);
3902
3903         /*
3904          * Acl update can result in inode attribute update.
3905          * so mark the attribute cache invalid.
3906          */
3907         spin_lock(&inode->i_lock);
3908         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3909         spin_unlock(&inode->i_lock);
3910         nfs_access_zap_cache(inode);
3911         nfs_zap_acl_cache(inode);
3912         return ret;
3913 }
3914
3915 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3916 {
3917         struct nfs4_exception exception = { };
3918         int err;
3919         do {
3920                 err = nfs4_handle_exception(NFS_SERVER(inode),
3921                                 __nfs4_proc_set_acl(inode, buf, buflen),
3922                                 &exception);
3923         } while (exception.retry);
3924         return err;
3925 }
3926
3927 static int
3928 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3929 {
3930         struct nfs_client *clp = server->nfs_client;
3931
3932         if (task->tk_status >= 0)
3933                 return 0;
3934         switch(task->tk_status) {
3935                 case -NFS4ERR_DELEG_REVOKED:
3936                 case -NFS4ERR_ADMIN_REVOKED:
3937                 case -NFS4ERR_BAD_STATEID:
3938                         if (state == NULL)
3939                                 break;
3940                         nfs_remove_bad_delegation(state->inode);
3941                 case -NFS4ERR_OPENMODE:
3942                         if (state == NULL)
3943                                 break;
3944                         nfs4_schedule_stateid_recovery(server, state);
3945                         goto wait_on_recovery;
3946                 case -NFS4ERR_EXPIRED:
3947                         if (state != NULL)
3948                                 nfs4_schedule_stateid_recovery(server, state);
3949                 case -NFS4ERR_STALE_STATEID:
3950                 case -NFS4ERR_STALE_CLIENTID:
3951                         nfs4_schedule_lease_recovery(clp);
3952                         goto wait_on_recovery;
3953 #if defined(CONFIG_NFS_V4_1)
3954                 case -NFS4ERR_BADSESSION:
3955                 case -NFS4ERR_BADSLOT:
3956                 case -NFS4ERR_BAD_HIGH_SLOT:
3957                 case -NFS4ERR_DEADSESSION:
3958                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3959                 case -NFS4ERR_SEQ_FALSE_RETRY:
3960                 case -NFS4ERR_SEQ_MISORDERED:
3961                         dprintk("%s ERROR %d, Reset session\n", __func__,
3962                                 task->tk_status);
3963                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3964                         task->tk_status = 0;
3965                         return -EAGAIN;
3966 #endif /* CONFIG_NFS_V4_1 */
3967                 case -NFS4ERR_DELAY:
3968                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3969                 case -NFS4ERR_GRACE:
3970                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3971                         task->tk_status = 0;
3972                         return -EAGAIN;
3973                 case -NFS4ERR_RETRY_UNCACHED_REP:
3974                 case -NFS4ERR_OLD_STATEID:
3975                         task->tk_status = 0;
3976                         return -EAGAIN;
3977         }
3978         task->tk_status = nfs4_map_errors(task->tk_status);
3979         return 0;
3980 wait_on_recovery:
3981         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3982         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3983                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3984         task->tk_status = 0;
3985         return -EAGAIN;
3986 }
3987
3988 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3989                                     nfs4_verifier *bootverf)
3990 {
3991         __be32 verf[2];
3992
3993         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3994                 /* An impossible timestamp guarantees this value
3995                  * will never match a generated boot time. */
3996                 verf[0] = 0;
3997                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3998         } else {
3999                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4000                 verf[0] = (__be32)nn->boot_time.tv_sec;
4001                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4002         }
4003         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4004 }
4005
4006 static unsigned int
4007 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4008                                    char *buf, size_t len)
4009 {
4010         unsigned int result;
4011
4012         rcu_read_lock();
4013         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4014                                 clp->cl_ipaddr,
4015                                 rpc_peeraddr2str(clp->cl_rpcclient,
4016                                                         RPC_DISPLAY_ADDR),
4017                                 rpc_peeraddr2str(clp->cl_rpcclient,
4018                                                         RPC_DISPLAY_PROTO));
4019         rcu_read_unlock();
4020         return result;
4021 }
4022
4023 static unsigned int
4024 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4025                                 char *buf, size_t len)
4026 {
4027         char *nodename = clp->cl_rpcclient->cl_nodename;
4028
4029         if (nfs4_client_id_uniquifier[0] != '\0')
4030                 nodename = nfs4_client_id_uniquifier;
4031         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4032                                 clp->rpc_ops->version, clp->cl_minorversion,
4033                                 nodename);
4034 }
4035
4036 /**
4037  * nfs4_proc_setclientid - Negotiate client ID
4038  * @clp: state data structure
4039  * @program: RPC program for NFSv4 callback service
4040  * @port: IP port number for NFS4 callback service
4041  * @cred: RPC credential to use for this call
4042  * @res: where to place the result
4043  *
4044  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4045  */
4046 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4047                 unsigned short port, struct rpc_cred *cred,
4048                 struct nfs4_setclientid_res *res)
4049 {
4050         nfs4_verifier sc_verifier;
4051         struct nfs4_setclientid setclientid = {
4052                 .sc_verifier = &sc_verifier,
4053                 .sc_prog = program,
4054                 .sc_cb_ident = clp->cl_cb_ident,
4055         };
4056         struct rpc_message msg = {
4057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4058                 .rpc_argp = &setclientid,
4059                 .rpc_resp = res,
4060                 .rpc_cred = cred,
4061         };
4062         int status;
4063
4064         /* nfs_client_id4 */
4065         nfs4_init_boot_verifier(clp, &sc_verifier);
4066         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4067                 setclientid.sc_name_len =
4068                                 nfs4_init_uniform_client_string(clp,
4069                                                 setclientid.sc_name,
4070                                                 sizeof(setclientid.sc_name));
4071         else
4072                 setclientid.sc_name_len =
4073                                 nfs4_init_nonuniform_client_string(clp,
4074                                                 setclientid.sc_name,
4075                                                 sizeof(setclientid.sc_name));
4076         /* cb_client4 */
4077         rcu_read_lock();
4078         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4079                                 sizeof(setclientid.sc_netid),
4080                                 rpc_peeraddr2str(clp->cl_rpcclient,
4081                                                         RPC_DISPLAY_NETID));
4082         rcu_read_unlock();
4083         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4084                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4085                                 clp->cl_ipaddr, port >> 8, port & 255);
4086
4087         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4088                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4089                 setclientid.sc_name_len, setclientid.sc_name);
4090         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4091         dprintk("NFS reply setclientid: %d\n", status);
4092         return status;
4093 }
4094
4095 /**
4096  * nfs4_proc_setclientid_confirm - Confirm client ID
4097  * @clp: state data structure
4098  * @res: result of a previous SETCLIENTID
4099  * @cred: RPC credential to use for this call
4100  *
4101  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4102  */
4103 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4104                 struct nfs4_setclientid_res *arg,
4105                 struct rpc_cred *cred)
4106 {
4107         struct nfs_fsinfo fsinfo;
4108         struct rpc_message msg = {
4109                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4110                 .rpc_argp = arg,
4111                 .rpc_resp = &fsinfo,
4112                 .rpc_cred = cred,
4113         };
4114         unsigned long now;
4115         int status;
4116
4117         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4118                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4119                 clp->cl_clientid);
4120         now = jiffies;
4121         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4122         if (status == 0) {
4123                 spin_lock(&clp->cl_lock);
4124                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4125                 clp->cl_last_renewal = now;
4126                 spin_unlock(&clp->cl_lock);
4127         }
4128         dprintk("NFS reply setclientid_confirm: %d\n", status);
4129         return status;
4130 }
4131
4132 struct nfs4_delegreturndata {
4133         struct nfs4_delegreturnargs args;
4134         struct nfs4_delegreturnres res;
4135         struct nfs_fh fh;
4136         nfs4_stateid stateid;
4137         unsigned long timestamp;
4138         struct nfs_fattr fattr;
4139         int rpc_status;
4140 };
4141
4142 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4143 {
4144         struct nfs4_delegreturndata *data = calldata;
4145
4146         if (!nfs4_sequence_done(task, &data->res.seq_res))
4147                 return;
4148
4149         switch (task->tk_status) {
4150         case -NFS4ERR_STALE_STATEID:
4151         case -NFS4ERR_EXPIRED:
4152         case 0:
4153                 renew_lease(data->res.server, data->timestamp);
4154                 break;
4155         default:
4156                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4157                                 -EAGAIN) {
4158                         rpc_restart_call_prepare(task);
4159                         return;
4160                 }
4161         }
4162         data->rpc_status = task->tk_status;
4163 }
4164
4165 static void nfs4_delegreturn_release(void *calldata)
4166 {
4167         kfree(calldata);
4168 }
4169
4170 #if defined(CONFIG_NFS_V4_1)
4171 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4172 {
4173         struct nfs4_delegreturndata *d_data;
4174
4175         d_data = (struct nfs4_delegreturndata *)data;
4176
4177         nfs4_setup_sequence(d_data->res.server,
4178                         &d_data->args.seq_args,
4179                         &d_data->res.seq_res,
4180                         task);
4181 }
4182 #endif /* CONFIG_NFS_V4_1 */
4183
4184 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4185 #if defined(CONFIG_NFS_V4_1)
4186         .rpc_call_prepare = nfs4_delegreturn_prepare,
4187 #endif /* CONFIG_NFS_V4_1 */
4188         .rpc_call_done = nfs4_delegreturn_done,
4189         .rpc_release = nfs4_delegreturn_release,
4190 };
4191
4192 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4193 {
4194         struct nfs4_delegreturndata *data;
4195         struct nfs_server *server = NFS_SERVER(inode);
4196         struct rpc_task *task;
4197         struct rpc_message msg = {
4198                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4199                 .rpc_cred = cred,
4200         };
4201         struct rpc_task_setup task_setup_data = {
4202                 .rpc_client = server->client,
4203                 .rpc_message = &msg,
4204                 .callback_ops = &nfs4_delegreturn_ops,
4205                 .flags = RPC_TASK_ASYNC,
4206         };
4207         int status = 0;
4208
4209         data = kzalloc(sizeof(*data), GFP_NOFS);
4210         if (data == NULL)
4211                 return -ENOMEM;
4212         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4213         data->args.fhandle = &data->fh;
4214         data->args.stateid = &data->stateid;
4215         data->args.bitmask = server->cache_consistency_bitmask;
4216         nfs_copy_fh(&data->fh, NFS_FH(inode));
4217         nfs4_stateid_copy(&data->stateid, stateid);
4218         data->res.fattr = &data->fattr;
4219         data->res.server = server;
4220         nfs_fattr_init(data->res.fattr);
4221         data->timestamp = jiffies;
4222         data->rpc_status = 0;
4223
4224         task_setup_data.callback_data = data;
4225         msg.rpc_argp = &data->args;
4226         msg.rpc_resp = &data->res;
4227         task = rpc_run_task(&task_setup_data);
4228         if (IS_ERR(task))
4229                 return PTR_ERR(task);
4230         if (!issync)
4231                 goto out;
4232         status = nfs4_wait_for_completion_rpc_task(task);
4233         if (status != 0)
4234                 goto out;
4235         status = data->rpc_status;
4236         if (status == 0)
4237                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4238         else
4239                 nfs_refresh_inode(inode, &data->fattr);
4240 out:
4241         rpc_put_task(task);
4242         return status;
4243 }
4244
4245 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4246 {
4247         struct nfs_server *server = NFS_SERVER(inode);
4248         struct nfs4_exception exception = { };
4249         int err;
4250         do {
4251                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4252                 switch (err) {
4253                         case -NFS4ERR_STALE_STATEID:
4254                         case -NFS4ERR_EXPIRED:
4255                         case 0:
4256                                 return 0;
4257                 }
4258                 err = nfs4_handle_exception(server, err, &exception);
4259         } while (exception.retry);
4260         return err;
4261 }
4262
4263 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4264 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4265
4266 /*
4267  * sleep, with exponential backoff, and retry the LOCK operation.
4268  */
4269 static unsigned long
4270 nfs4_set_lock_task_retry(unsigned long timeout)
4271 {
4272         freezable_schedule_timeout_killable(timeout);
4273         timeout <<= 1;
4274         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4275                 return NFS4_LOCK_MAXTIMEOUT;
4276         return timeout;
4277 }
4278
4279 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4280 {
4281         struct inode *inode = state->inode;
4282         struct nfs_server *server = NFS_SERVER(inode);
4283         struct nfs_client *clp = server->nfs_client;
4284         struct nfs_lockt_args arg = {
4285                 .fh = NFS_FH(inode),
4286                 .fl = request,
4287         };
4288         struct nfs_lockt_res res = {
4289                 .denied = request,
4290         };
4291         struct rpc_message msg = {
4292                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4293                 .rpc_argp       = &arg,
4294                 .rpc_resp       = &res,
4295                 .rpc_cred       = state->owner->so_cred,
4296         };
4297         struct nfs4_lock_state *lsp;
4298         int status;
4299
4300         arg.lock_owner.clientid = clp->cl_clientid;
4301         status = nfs4_set_lock_state(state, request);
4302         if (status != 0)
4303                 goto out;
4304         lsp = request->fl_u.nfs4_fl.owner;
4305         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4306         arg.lock_owner.s_dev = server->s_dev;
4307         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4308         switch (status) {
4309                 case 0:
4310                         request->fl_type = F_UNLCK;
4311                         break;
4312                 case -NFS4ERR_DENIED:
4313                         status = 0;
4314         }
4315         request->fl_ops->fl_release_private(request);
4316 out:
4317         return status;
4318 }
4319
4320 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4321 {
4322         struct nfs4_exception exception = { };
4323         int err;
4324
4325         do {
4326                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4327                                 _nfs4_proc_getlk(state, cmd, request),
4328                                 &exception);
4329         } while (exception.retry);
4330         return err;
4331 }
4332
4333 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4334 {
4335         int res = 0;
4336         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4337                 case FL_POSIX:
4338                         res = posix_lock_file_wait(file, fl);
4339                         break;
4340                 case FL_FLOCK:
4341                         res = flock_lock_file_wait(file, fl);
4342                         break;
4343                 default:
4344                         BUG();
4345         }
4346         return res;
4347 }
4348
4349 struct nfs4_unlockdata {
4350         struct nfs_locku_args arg;
4351         struct nfs_locku_res res;
4352         struct nfs4_lock_state *lsp;
4353         struct nfs_open_context *ctx;
4354         struct file_lock fl;
4355         const struct nfs_server *server;
4356         unsigned long timestamp;
4357 };
4358
4359 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4360                 struct nfs_open_context *ctx,
4361                 struct nfs4_lock_state *lsp,
4362                 struct nfs_seqid *seqid)
4363 {
4364         struct nfs4_unlockdata *p;
4365         struct inode *inode = lsp->ls_state->inode;
4366
4367         p = kzalloc(sizeof(*p), GFP_NOFS);
4368         if (p == NULL)
4369                 return NULL;
4370         p->arg.fh = NFS_FH(inode);
4371         p->arg.fl = &p->fl;
4372         p->arg.seqid = seqid;
4373         p->res.seqid = seqid;
4374         p->arg.stateid = &lsp->ls_stateid;
4375         p->lsp = lsp;
4376         atomic_inc(&lsp->ls_count);
4377         /* Ensure we don't close file until we're done freeing locks! */
4378         p->ctx = get_nfs_open_context(ctx);
4379         memcpy(&p->fl, fl, sizeof(p->fl));
4380         p->server = NFS_SERVER(inode);
4381         return p;
4382 }
4383
4384 static void nfs4_locku_release_calldata(void *data)
4385 {
4386         struct nfs4_unlockdata *calldata = data;
4387         nfs_free_seqid(calldata->arg.seqid);
4388         nfs4_put_lock_state(calldata->lsp);
4389         put_nfs_open_context(calldata->ctx);
4390         kfree(calldata);
4391 }
4392
4393 static void nfs4_locku_done(struct rpc_task *task, void *data)
4394 {
4395         struct nfs4_unlockdata *calldata = data;
4396
4397         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4398                 return;
4399         switch (task->tk_status) {
4400                 case 0:
4401                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4402                                         &calldata->res.stateid);
4403                         renew_lease(calldata->server, calldata->timestamp);
4404                         break;
4405                 case -NFS4ERR_BAD_STATEID:
4406                 case -NFS4ERR_OLD_STATEID:
4407                 case -NFS4ERR_STALE_STATEID:
4408                 case -NFS4ERR_EXPIRED:
4409                         break;
4410                 default:
4411                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4412                                 rpc_restart_call_prepare(task);
4413         }
4414         nfs_release_seqid(calldata->arg.seqid);
4415 }
4416
4417 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4418 {
4419         struct nfs4_unlockdata *calldata = data;
4420
4421         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4422                 return;
4423         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4424                 /* Note: exit _without_ running nfs4_locku_done */
4425                 task->tk_action = NULL;
4426                 nfs4_sequence_done(task, &calldata->res.seq_res);
4427                 return;
4428         }
4429         calldata->timestamp = jiffies;
4430         if (nfs4_setup_sequence(calldata->server,
4431                                 &calldata->arg.seq_args,
4432                                 &calldata->res.seq_res,
4433                                 task) != 0)
4434                 nfs_release_seqid(calldata->arg.seqid);
4435 }
4436
4437 static const struct rpc_call_ops nfs4_locku_ops = {
4438         .rpc_call_prepare = nfs4_locku_prepare,
4439         .rpc_call_done = nfs4_locku_done,
4440         .rpc_release = nfs4_locku_release_calldata,
4441 };
4442
4443 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4444                 struct nfs_open_context *ctx,
4445                 struct nfs4_lock_state *lsp,
4446                 struct nfs_seqid *seqid)
4447 {
4448         struct nfs4_unlockdata *data;
4449         struct rpc_message msg = {
4450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4451                 .rpc_cred = ctx->cred,
4452         };
4453         struct rpc_task_setup task_setup_data = {
4454                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4455                 .rpc_message = &msg,
4456                 .callback_ops = &nfs4_locku_ops,
4457                 .workqueue = nfsiod_workqueue,
4458                 .flags = RPC_TASK_ASYNC,
4459         };
4460
4461         /* Ensure this is an unlock - when canceling a lock, the
4462          * canceled lock is passed in, and it won't be an unlock.
4463          */
4464         fl->fl_type = F_UNLCK;
4465
4466         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4467         if (data == NULL) {
4468                 nfs_free_seqid(seqid);
4469                 return ERR_PTR(-ENOMEM);
4470         }
4471
4472         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4473         msg.rpc_argp = &data->arg;
4474         msg.rpc_resp = &data->res;
4475         task_setup_data.callback_data = data;
4476         return rpc_run_task(&task_setup_data);
4477 }
4478
4479 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4480 {
4481         struct nfs_inode *nfsi = NFS_I(state->inode);
4482         struct nfs_seqid *seqid;
4483         struct nfs4_lock_state *lsp;
4484         struct rpc_task *task;
4485         int status = 0;
4486         unsigned char fl_flags = request->fl_flags;
4487
4488         status = nfs4_set_lock_state(state, request);
4489         /* Unlock _before_ we do the RPC call */
4490         request->fl_flags |= FL_EXISTS;
4491         down_read(&nfsi->rwsem);
4492         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4493                 up_read(&nfsi->rwsem);
4494                 goto out;
4495         }
4496         up_read(&nfsi->rwsem);
4497         if (status != 0)
4498                 goto out;
4499         /* Is this a delegated lock? */
4500         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4501                 goto out;
4502         lsp = request->fl_u.nfs4_fl.owner;
4503         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4504         status = -ENOMEM;
4505         if (seqid == NULL)
4506                 goto out;
4507         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4508         status = PTR_ERR(task);
4509         if (IS_ERR(task))
4510                 goto out;
4511         status = nfs4_wait_for_completion_rpc_task(task);
4512         rpc_put_task(task);
4513 out:
4514         request->fl_flags = fl_flags;
4515         return status;
4516 }
4517
4518 struct nfs4_lockdata {
4519         struct nfs_lock_args arg;
4520         struct nfs_lock_res res;
4521         struct nfs4_lock_state *lsp;
4522         struct nfs_open_context *ctx;
4523         struct file_lock fl;
4524         unsigned long timestamp;
4525         int rpc_status;
4526         int cancelled;
4527         struct nfs_server *server;
4528 };
4529
4530 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4531                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4532                 gfp_t gfp_mask)
4533 {
4534         struct nfs4_lockdata *p;
4535         struct inode *inode = lsp->ls_state->inode;
4536         struct nfs_server *server = NFS_SERVER(inode);
4537
4538         p = kzalloc(sizeof(*p), gfp_mask);
4539         if (p == NULL)
4540                 return NULL;
4541
4542         p->arg.fh = NFS_FH(inode);
4543         p->arg.fl = &p->fl;
4544         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4545         if (p->arg.open_seqid == NULL)
4546                 goto out_free;
4547         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4548         if (p->arg.lock_seqid == NULL)
4549                 goto out_free_seqid;
4550         p->arg.lock_stateid = &lsp->ls_stateid;
4551         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4552         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4553         p->arg.lock_owner.s_dev = server->s_dev;
4554         p->res.lock_seqid = p->arg.lock_seqid;
4555         p->lsp = lsp;
4556         p->server = server;
4557         atomic_inc(&lsp->ls_count);
4558         p->ctx = get_nfs_open_context(ctx);
4559         memcpy(&p->fl, fl, sizeof(p->fl));
4560         return p;
4561 out_free_seqid:
4562         nfs_free_seqid(p->arg.open_seqid);
4563 out_free:
4564         kfree(p);
4565         return NULL;
4566 }
4567
4568 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4569 {
4570         struct nfs4_lockdata *data = calldata;
4571         struct nfs4_state *state = data->lsp->ls_state;
4572
4573         dprintk("%s: begin!\n", __func__);
4574         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4575                 return;
4576         /* Do we need to do an open_to_lock_owner? */
4577         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4578                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4579                         goto out_release_lock_seqid;
4580                 }
4581                 data->arg.open_stateid = &state->stateid;
4582                 data->arg.new_lock_owner = 1;
4583                 data->res.open_seqid = data->arg.open_seqid;
4584         } else
4585                 data->arg.new_lock_owner = 0;
4586         data->timestamp = jiffies;
4587         if (nfs4_setup_sequence(data->server,
4588                                 &data->arg.seq_args,
4589                                 &data->res.seq_res,
4590                                 task) == 0)
4591                 return;
4592         nfs_release_seqid(data->arg.open_seqid);
4593 out_release_lock_seqid:
4594         nfs_release_seqid(data->arg.lock_seqid);
4595         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4596 }
4597
4598 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4599 {
4600         struct nfs4_lockdata *data = calldata;
4601
4602         dprintk("%s: begin!\n", __func__);
4603
4604         if (!nfs4_sequence_done(task, &data->res.seq_res))
4605                 return;
4606
4607         data->rpc_status = task->tk_status;
4608         if (data->arg.new_lock_owner != 0) {
4609                 if (data->rpc_status == 0)
4610                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4611                 else
4612                         goto out;
4613         }
4614         if (data->rpc_status == 0) {
4615                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4616                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4617                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4618         }
4619 out:
4620         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4621 }
4622
4623 static void nfs4_lock_release(void *calldata)
4624 {
4625         struct nfs4_lockdata *data = calldata;
4626
4627         dprintk("%s: begin!\n", __func__);
4628         nfs_free_seqid(data->arg.open_seqid);
4629         if (data->cancelled != 0) {
4630                 struct rpc_task *task;
4631                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4632                                 data->arg.lock_seqid);
4633                 if (!IS_ERR(task))
4634                         rpc_put_task_async(task);
4635                 dprintk("%s: cancelling lock!\n", __func__);
4636         } else
4637                 nfs_free_seqid(data->arg.lock_seqid);
4638         nfs4_put_lock_state(data->lsp);
4639         put_nfs_open_context(data->ctx);
4640         kfree(data);
4641         dprintk("%s: done!\n", __func__);
4642 }
4643
4644 static const struct rpc_call_ops nfs4_lock_ops = {
4645         .rpc_call_prepare = nfs4_lock_prepare,
4646         .rpc_call_done = nfs4_lock_done,
4647         .rpc_release = nfs4_lock_release,
4648 };
4649
4650 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4651 {
4652         switch (error) {
4653         case -NFS4ERR_ADMIN_REVOKED:
4654         case -NFS4ERR_BAD_STATEID:
4655                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4656                 if (new_lock_owner != 0 ||
4657                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4658                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4659                 break;
4660         case -NFS4ERR_STALE_STATEID:
4661                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4662         case -NFS4ERR_EXPIRED:
4663                 nfs4_schedule_lease_recovery(server->nfs_client);
4664         };
4665 }
4666
4667 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4668 {
4669         struct nfs4_lockdata *data;
4670         struct rpc_task *task;
4671         struct rpc_message msg = {
4672                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4673                 .rpc_cred = state->owner->so_cred,
4674         };
4675         struct rpc_task_setup task_setup_data = {
4676                 .rpc_client = NFS_CLIENT(state->inode),
4677                 .rpc_message = &msg,
4678                 .callback_ops = &nfs4_lock_ops,
4679                 .workqueue = nfsiod_workqueue,
4680                 .flags = RPC_TASK_ASYNC,
4681         };
4682         int ret;
4683
4684         dprintk("%s: begin!\n", __func__);
4685         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4686                         fl->fl_u.nfs4_fl.owner,
4687                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4688         if (data == NULL)
4689                 return -ENOMEM;
4690         if (IS_SETLKW(cmd))
4691                 data->arg.block = 1;
4692         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4693         msg.rpc_argp = &data->arg;
4694         msg.rpc_resp = &data->res;
4695         task_setup_data.callback_data = data;
4696         if (recovery_type > NFS_LOCK_NEW) {
4697                 if (recovery_type == NFS_LOCK_RECLAIM)
4698                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4699                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4700         }
4701         task = rpc_run_task(&task_setup_data);
4702         if (IS_ERR(task))
4703                 return PTR_ERR(task);
4704         ret = nfs4_wait_for_completion_rpc_task(task);
4705         if (ret == 0) {
4706                 ret = data->rpc_status;
4707                 if (ret)
4708                         nfs4_handle_setlk_error(data->server, data->lsp,
4709                                         data->arg.new_lock_owner, ret);
4710         } else
4711                 data->cancelled = 1;
4712         rpc_put_task(task);
4713         dprintk("%s: done, ret = %d!\n", __func__, ret);
4714         return ret;
4715 }
4716
4717 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4718 {
4719         struct nfs_server *server = NFS_SERVER(state->inode);
4720         struct nfs4_exception exception = {
4721                 .inode = state->inode,
4722         };
4723         int err;
4724
4725         do {
4726                 /* Cache the lock if possible... */
4727                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4728                         return 0;
4729                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4730                 if (err != -NFS4ERR_DELAY)
4731                         break;
4732                 nfs4_handle_exception(server, err, &exception);
4733         } while (exception.retry);
4734         return err;
4735 }
4736
4737 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4738 {
4739         struct nfs_server *server = NFS_SERVER(state->inode);
4740         struct nfs4_exception exception = {
4741                 .inode = state->inode,
4742         };
4743         int err;
4744
4745         err = nfs4_set_lock_state(state, request);
4746         if (err != 0)
4747                 return err;
4748         do {
4749                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4750                         return 0;
4751                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4752                 switch (err) {
4753                 default:
4754                         goto out;
4755                 case -NFS4ERR_GRACE:
4756                 case -NFS4ERR_DELAY:
4757                         nfs4_handle_exception(server, err, &exception);
4758                         err = 0;
4759                 }
4760         } while (exception.retry);
4761 out:
4762         return err;
4763 }
4764
4765 #if defined(CONFIG_NFS_V4_1)
4766 /**
4767  * nfs41_check_expired_locks - possibly free a lock stateid
4768  *
4769  * @state: NFSv4 state for an inode
4770  *
4771  * Returns NFS_OK if recovery for this stateid is now finished.
4772  * Otherwise a negative NFS4ERR value is returned.
4773  */
4774 static int nfs41_check_expired_locks(struct nfs4_state *state)
4775 {
4776         int status, ret = -NFS4ERR_BAD_STATEID;
4777         struct nfs4_lock_state *lsp;
4778         struct nfs_server *server = NFS_SERVER(state->inode);
4779
4780         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4781                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4782                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4783                         if (status != NFS_OK) {
4784                                 /* Free the stateid unless the server
4785                                  * informs us the stateid is unrecognized. */
4786                                 if (status != -NFS4ERR_BAD_STATEID)
4787                                         nfs41_free_stateid(server,
4788                                                         &lsp->ls_stateid);
4789                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4790                                 ret = status;
4791                         }
4792                 }
4793         };
4794
4795         return ret;
4796 }
4797
4798 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4799 {
4800         int status = NFS_OK;
4801
4802         if (test_bit(LK_STATE_IN_USE, &state->flags))
4803                 status = nfs41_check_expired_locks(state);
4804         if (status != NFS_OK)
4805                 status = nfs4_lock_expired(state, request);
4806         return status;
4807 }
4808 #endif
4809
4810 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4811 {
4812         struct nfs_inode *nfsi = NFS_I(state->inode);
4813         unsigned char fl_flags = request->fl_flags;
4814         int status = -ENOLCK;
4815
4816         if ((fl_flags & FL_POSIX) &&
4817                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4818                 goto out;
4819         /* Is this a delegated open? */
4820         status = nfs4_set_lock_state(state, request);
4821         if (status != 0)
4822                 goto out;
4823         request->fl_flags |= FL_ACCESS;
4824         status = do_vfs_lock(request->fl_file, request);
4825         if (status < 0)
4826                 goto out;
4827         down_read(&nfsi->rwsem);
4828         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4829                 /* Yes: cache locks! */
4830                 /* ...but avoid races with delegation recall... */
4831                 request->fl_flags = fl_flags & ~FL_SLEEP;
4832                 status = do_vfs_lock(request->fl_file, request);
4833                 goto out_unlock;
4834         }
4835         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4836         if (status != 0)
4837                 goto out_unlock;
4838         /* Note: we always want to sleep here! */
4839         request->fl_flags = fl_flags | FL_SLEEP;
4840         if (do_vfs_lock(request->fl_file, request) < 0)
4841                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4842                         "manager!\n", __func__);
4843 out_unlock:
4844         up_read(&nfsi->rwsem);
4845 out:
4846         request->fl_flags = fl_flags;
4847         return status;
4848 }
4849
4850 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4851 {
4852         struct nfs4_exception exception = {
4853                 .state = state,
4854                 .inode = state->inode,
4855         };
4856         int err;
4857
4858         do {
4859                 err = _nfs4_proc_setlk(state, cmd, request);
4860                 if (err == -NFS4ERR_DENIED)
4861                         err = -EAGAIN;
4862                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4863                                 err, &exception);
4864         } while (exception.retry);
4865         return err;
4866 }
4867
4868 static int
4869 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4870 {
4871         struct nfs_open_context *ctx;
4872         struct nfs4_state *state;
4873         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4874         int status;
4875
4876         /* verify open state */
4877         ctx = nfs_file_open_context(filp);
4878         state = ctx->state;
4879
4880         if (request->fl_start < 0 || request->fl_end < 0)
4881                 return -EINVAL;
4882
4883         if (IS_GETLK(cmd)) {
4884                 if (state != NULL)
4885                         return nfs4_proc_getlk(state, F_GETLK, request);
4886                 return 0;
4887         }
4888
4889         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4890                 return -EINVAL;
4891
4892         if (request->fl_type == F_UNLCK) {
4893                 if (state != NULL)
4894                         return nfs4_proc_unlck(state, cmd, request);
4895                 return 0;
4896         }
4897
4898         if (state == NULL)
4899                 return -ENOLCK;
4900         /*
4901          * Don't rely on the VFS having checked the file open mode,
4902          * since it won't do this for flock() locks.
4903          */
4904         switch (request->fl_type) {
4905         case F_RDLCK:
4906                 if (!(filp->f_mode & FMODE_READ))
4907                         return -EBADF;
4908                 break;
4909         case F_WRLCK:
4910                 if (!(filp->f_mode & FMODE_WRITE))
4911                         return -EBADF;
4912         }
4913
4914         do {
4915                 status = nfs4_proc_setlk(state, cmd, request);
4916                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4917                         break;
4918                 timeout = nfs4_set_lock_task_retry(timeout);
4919                 status = -ERESTARTSYS;
4920                 if (signalled())
4921                         break;
4922         } while(status < 0);
4923         return status;
4924 }
4925
4926 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4927 {
4928         struct nfs_server *server = NFS_SERVER(state->inode);
4929         struct nfs4_exception exception = { };
4930         int err;
4931
4932         err = nfs4_set_lock_state(state, fl);
4933         if (err != 0)
4934                 goto out;
4935         do {
4936                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4937                 switch (err) {
4938                         default:
4939                                 printk(KERN_ERR "NFS: %s: unhandled error "
4940                                         "%d.\n", __func__, err);
4941                         case 0:
4942                         case -ESTALE:
4943                                 goto out;
4944                         case -NFS4ERR_EXPIRED:
4945                                 nfs4_schedule_stateid_recovery(server, state);
4946                         case -NFS4ERR_STALE_CLIENTID:
4947                         case -NFS4ERR_STALE_STATEID:
4948                                 nfs4_schedule_lease_recovery(server->nfs_client);
4949                                 goto out;
4950                         case -NFS4ERR_BADSESSION:
4951                         case -NFS4ERR_BADSLOT:
4952                         case -NFS4ERR_BAD_HIGH_SLOT:
4953                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4954                         case -NFS4ERR_DEADSESSION:
4955                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4956                                 goto out;
4957                         case -ERESTARTSYS:
4958                                 /*
4959                                  * The show must go on: exit, but mark the
4960                                  * stateid as needing recovery.
4961                                  */
4962                         case -NFS4ERR_DELEG_REVOKED:
4963                         case -NFS4ERR_ADMIN_REVOKED:
4964                         case -NFS4ERR_BAD_STATEID:
4965                         case -NFS4ERR_OPENMODE:
4966                                 nfs4_schedule_stateid_recovery(server, state);
4967                                 err = 0;
4968                                 goto out;
4969                         case -ENOMEM:
4970                         case -NFS4ERR_DENIED:
4971                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4972                                 err = 0;
4973                                 goto out;
4974                         case -NFS4ERR_DELAY:
4975                                 break;
4976                 }
4977                 err = nfs4_handle_exception(server, err, &exception);
4978         } while (exception.retry);
4979 out:
4980         return err;
4981 }
4982
4983 struct nfs_release_lockowner_data {
4984         struct nfs4_lock_state *lsp;
4985         struct nfs_server *server;
4986         struct nfs_release_lockowner_args args;
4987 };
4988
4989 static void nfs4_release_lockowner_release(void *calldata)
4990 {
4991         struct nfs_release_lockowner_data *data = calldata;
4992         nfs4_free_lock_state(data->server, data->lsp);
4993         kfree(calldata);
4994 }
4995
4996 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4997         .rpc_release = nfs4_release_lockowner_release,
4998 };
4999
5000 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5001 {
5002         struct nfs_server *server = lsp->ls_state->owner->so_server;
5003         struct nfs_release_lockowner_data *data;
5004         struct rpc_message msg = {
5005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5006         };
5007
5008         if (server->nfs_client->cl_mvops->minor_version != 0)
5009                 return -EINVAL;
5010         data = kmalloc(sizeof(*data), GFP_NOFS);
5011         if (!data)
5012                 return -ENOMEM;
5013         data->lsp = lsp;
5014         data->server = server;
5015         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5016         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5017         data->args.lock_owner.s_dev = server->s_dev;
5018         msg.rpc_argp = &data->args;
5019         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5020         return 0;
5021 }
5022
5023 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5024
5025 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5026                                    const void *buf, size_t buflen,
5027                                    int flags, int type)
5028 {
5029         if (strcmp(key, "") != 0)
5030                 return -EINVAL;
5031
5032         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5033 }
5034
5035 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5036                                    void *buf, size_t buflen, int type)
5037 {
5038         if (strcmp(key, "") != 0)
5039                 return -EINVAL;
5040
5041         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5042 }
5043
5044 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5045                                        size_t list_len, const char *name,
5046                                        size_t name_len, int type)
5047 {
5048         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5049
5050         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5051                 return 0;
5052
5053         if (list && len <= list_len)
5054                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5055         return len;
5056 }
5057
5058 /*
5059  * nfs_fhget will use either the mounted_on_fileid or the fileid
5060  */
5061 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5062 {
5063         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5064                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5065               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5066               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5067                 return;
5068
5069         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5070                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5071         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5072         fattr->nlink = 2;
5073 }
5074
5075 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5076                                    const struct qstr *name,
5077                                    struct nfs4_fs_locations *fs_locations,
5078                                    struct page *page)
5079 {
5080         struct nfs_server *server = NFS_SERVER(dir);
5081         u32 bitmask[2] = {
5082                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5083         };
5084         struct nfs4_fs_locations_arg args = {
5085                 .dir_fh = NFS_FH(dir),
5086                 .name = name,
5087                 .page = page,
5088                 .bitmask = bitmask,
5089         };
5090         struct nfs4_fs_locations_res res = {
5091                 .fs_locations = fs_locations,
5092         };
5093         struct rpc_message msg = {
5094                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5095                 .rpc_argp = &args,
5096                 .rpc_resp = &res,
5097         };
5098         int status;
5099
5100         dprintk("%s: start\n", __func__);
5101
5102         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5103          * is not supported */
5104         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5105                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5106         else
5107                 bitmask[0] |= FATTR4_WORD0_FILEID;
5108
5109         nfs_fattr_init(&fs_locations->fattr);
5110         fs_locations->server = server;
5111         fs_locations->nlocations = 0;
5112         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5113         dprintk("%s: returned status = %d\n", __func__, status);
5114         return status;
5115 }
5116
5117 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5118                            const struct qstr *name,
5119                            struct nfs4_fs_locations *fs_locations,
5120                            struct page *page)
5121 {
5122         struct nfs4_exception exception = { };
5123         int err;
5124         do {
5125                 err = nfs4_handle_exception(NFS_SERVER(dir),
5126                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5127                                 &exception);
5128         } while (exception.retry);
5129         return err;
5130 }
5131
5132 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5133 {
5134         int status;
5135         struct nfs4_secinfo_arg args = {
5136                 .dir_fh = NFS_FH(dir),
5137                 .name   = name,
5138         };
5139         struct nfs4_secinfo_res res = {
5140                 .flavors     = flavors,
5141         };
5142         struct rpc_message msg = {
5143                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5144                 .rpc_argp = &args,
5145                 .rpc_resp = &res,
5146         };
5147
5148         dprintk("NFS call  secinfo %s\n", name->name);
5149         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5150         dprintk("NFS reply  secinfo: %d\n", status);
5151         return status;
5152 }
5153
5154 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5155                       struct nfs4_secinfo_flavors *flavors)
5156 {
5157         struct nfs4_exception exception = { };
5158         int err;
5159         do {
5160                 err = nfs4_handle_exception(NFS_SERVER(dir),
5161                                 _nfs4_proc_secinfo(dir, name, flavors),
5162                                 &exception);
5163         } while (exception.retry);
5164         return err;
5165 }
5166
5167 #ifdef CONFIG_NFS_V4_1
5168 /*
5169  * Check the exchange flags returned by the server for invalid flags, having
5170  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5171  * DS flags set.
5172  */
5173 static int nfs4_check_cl_exchange_flags(u32 flags)
5174 {
5175         if (flags & ~EXCHGID4_FLAG_MASK_R)
5176                 goto out_inval;
5177         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5178             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5179                 goto out_inval;
5180         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5181                 goto out_inval;
5182         return NFS_OK;
5183 out_inval:
5184         return -NFS4ERR_INVAL;
5185 }
5186
5187 static bool
5188 nfs41_same_server_scope(struct nfs41_server_scope *a,
5189                         struct nfs41_server_scope *b)
5190 {
5191         if (a->server_scope_sz == b->server_scope_sz &&
5192             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5193                 return true;
5194
5195         return false;
5196 }
5197
5198 /*
5199  * nfs4_proc_bind_conn_to_session()
5200  *
5201  * The 4.1 client currently uses the same TCP connection for the
5202  * fore and backchannel.
5203  */
5204 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5205 {
5206         int status;
5207         struct nfs41_bind_conn_to_session_res res;
5208         struct rpc_message msg = {
5209                 .rpc_proc =
5210                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5211                 .rpc_argp = clp,
5212                 .rpc_resp = &res,
5213                 .rpc_cred = cred,
5214         };
5215
5216         dprintk("--> %s\n", __func__);
5217
5218         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5219         if (unlikely(res.session == NULL)) {
5220                 status = -ENOMEM;
5221                 goto out;
5222         }
5223
5224         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5225         if (status == 0) {
5226                 if (memcmp(res.session->sess_id.data,
5227                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5228                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5229                         status = -EIO;
5230                         goto out_session;
5231                 }
5232                 if (res.dir != NFS4_CDFS4_BOTH) {
5233                         dprintk("NFS: %s: Unexpected direction from server\n",
5234                                 __func__);
5235                         status = -EIO;
5236                         goto out_session;
5237                 }
5238                 if (res.use_conn_in_rdma_mode) {
5239                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5240                                 __func__);
5241                         status = -EIO;
5242                         goto out_session;
5243                 }
5244         }
5245 out_session:
5246         kfree(res.session);
5247 out:
5248         dprintk("<-- %s status= %d\n", __func__, status);
5249         return status;
5250 }
5251
5252 /*
5253  * nfs4_proc_exchange_id()
5254  *
5255  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5256  *
5257  * Since the clientid has expired, all compounds using sessions
5258  * associated with the stale clientid will be returning
5259  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5260  * be in some phase of session reset.
5261  */
5262 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5263 {
5264         nfs4_verifier verifier;
5265         struct nfs41_exchange_id_args args = {
5266                 .verifier = &verifier,
5267                 .client = clp,
5268                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5269         };
5270         struct nfs41_exchange_id_res res = {
5271                 0
5272         };
5273         int status;
5274         struct rpc_message msg = {
5275                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5276                 .rpc_argp = &args,
5277                 .rpc_resp = &res,
5278                 .rpc_cred = cred,
5279         };
5280
5281         nfs4_init_boot_verifier(clp, &verifier);
5282         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5283                                                         sizeof(args.id));
5284         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5285                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5286                 args.id_len, args.id);
5287
5288         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5289                                         GFP_NOFS);
5290         if (unlikely(res.server_owner == NULL)) {
5291                 status = -ENOMEM;
5292                 goto out;
5293         }
5294
5295         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5296                                         GFP_NOFS);
5297         if (unlikely(res.server_scope == NULL)) {
5298                 status = -ENOMEM;
5299                 goto out_server_owner;
5300         }
5301
5302         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5303         if (unlikely(res.impl_id == NULL)) {
5304                 status = -ENOMEM;
5305                 goto out_server_scope;
5306         }
5307
5308         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5309         if (status == 0)
5310                 status = nfs4_check_cl_exchange_flags(res.flags);
5311
5312         if (status == 0) {
5313                 clp->cl_clientid = res.clientid;
5314                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5315                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5316                         clp->cl_seqid = res.seqid;
5317
5318                 kfree(clp->cl_serverowner);
5319                 clp->cl_serverowner = res.server_owner;
5320                 res.server_owner = NULL;
5321
5322                 /* use the most recent implementation id */
5323                 kfree(clp->cl_implid);
5324                 clp->cl_implid = res.impl_id;
5325
5326                 if (clp->cl_serverscope != NULL &&
5327                     !nfs41_same_server_scope(clp->cl_serverscope,
5328                                              res.server_scope)) {
5329                         dprintk("%s: server_scope mismatch detected\n",
5330                                 __func__);
5331                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5332                         kfree(clp->cl_serverscope);
5333                         clp->cl_serverscope = NULL;
5334                 }
5335
5336                 if (clp->cl_serverscope == NULL) {
5337                         clp->cl_serverscope = res.server_scope;
5338                         goto out;
5339                 }
5340         } else
5341                 kfree(res.impl_id);
5342
5343 out_server_owner:
5344         kfree(res.server_owner);
5345 out_server_scope:
5346         kfree(res.server_scope);
5347 out:
5348         if (clp->cl_implid != NULL)
5349                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5350                         "domain: %s, name: %s, date: %llu,%u\n",
5351                         clp->cl_implid->domain, clp->cl_implid->name,
5352                         clp->cl_implid->date.seconds,
5353                         clp->cl_implid->date.nseconds);
5354         dprintk("NFS reply exchange_id: %d\n", status);
5355         return status;
5356 }
5357
5358 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5359                 struct rpc_cred *cred)
5360 {
5361         struct rpc_message msg = {
5362                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5363                 .rpc_argp = clp,
5364                 .rpc_cred = cred,
5365         };
5366         int status;
5367
5368         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5369         if (status)
5370                 dprintk("NFS: Got error %d from the server %s on "
5371                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5372         return status;
5373 }
5374
5375 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5376                 struct rpc_cred *cred)
5377 {
5378         unsigned int loop;
5379         int ret;
5380
5381         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5382                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5383                 switch (ret) {
5384                 case -NFS4ERR_DELAY:
5385                 case -NFS4ERR_CLIENTID_BUSY:
5386                         ssleep(1);
5387                         break;
5388                 default:
5389                         return ret;
5390                 }
5391         }
5392         return 0;
5393 }
5394
5395 int nfs4_destroy_clientid(struct nfs_client *clp)
5396 {
5397         struct rpc_cred *cred;
5398         int ret = 0;
5399
5400         if (clp->cl_mvops->minor_version < 1)
5401                 goto out;
5402         if (clp->cl_exchange_flags == 0)
5403                 goto out;
5404         if (clp->cl_preserve_clid)
5405                 goto out;
5406         cred = nfs4_get_exchange_id_cred(clp);
5407         ret = nfs4_proc_destroy_clientid(clp, cred);
5408         if (cred)
5409                 put_rpccred(cred);
5410         switch (ret) {
5411         case 0:
5412         case -NFS4ERR_STALE_CLIENTID:
5413                 clp->cl_exchange_flags = 0;
5414         }
5415 out:
5416         return ret;
5417 }
5418
5419 struct nfs4_get_lease_time_data {
5420         struct nfs4_get_lease_time_args *args;
5421         struct nfs4_get_lease_time_res *res;
5422         struct nfs_client *clp;
5423 };
5424
5425 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5426                                         void *calldata)
5427 {
5428         struct nfs4_get_lease_time_data *data =
5429                         (struct nfs4_get_lease_time_data *)calldata;
5430
5431         dprintk("--> %s\n", __func__);
5432         /* just setup sequence, do not trigger session recovery
5433            since we're invoked within one */
5434         nfs41_setup_sequence(data->clp->cl_session,
5435                         &data->args->la_seq_args,
5436                         &data->res->lr_seq_res,
5437                         task);
5438         dprintk("<-- %s\n", __func__);
5439 }
5440
5441 /*
5442  * Called from nfs4_state_manager thread for session setup, so don't recover
5443  * from sequence operation or clientid errors.
5444  */
5445 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5446 {
5447         struct nfs4_get_lease_time_data *data =
5448                         (struct nfs4_get_lease_time_data *)calldata;
5449
5450         dprintk("--> %s\n", __func__);
5451         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5452                 return;
5453         switch (task->tk_status) {
5454         case -NFS4ERR_DELAY:
5455         case -NFS4ERR_GRACE:
5456                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5457                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5458                 task->tk_status = 0;
5459                 /* fall through */
5460         case -NFS4ERR_RETRY_UNCACHED_REP:
5461                 rpc_restart_call_prepare(task);
5462                 return;
5463         }
5464         dprintk("<-- %s\n", __func__);
5465 }
5466
5467 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5468         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5469         .rpc_call_done = nfs4_get_lease_time_done,
5470 };
5471
5472 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5473 {
5474         struct rpc_task *task;
5475         struct nfs4_get_lease_time_args args;
5476         struct nfs4_get_lease_time_res res = {
5477                 .lr_fsinfo = fsinfo,
5478         };
5479         struct nfs4_get_lease_time_data data = {
5480                 .args = &args,
5481                 .res = &res,
5482                 .clp = clp,
5483         };
5484         struct rpc_message msg = {
5485                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5486                 .rpc_argp = &args,
5487                 .rpc_resp = &res,
5488         };
5489         struct rpc_task_setup task_setup = {
5490                 .rpc_client = clp->cl_rpcclient,
5491                 .rpc_message = &msg,
5492                 .callback_ops = &nfs4_get_lease_time_ops,
5493                 .callback_data = &data,
5494                 .flags = RPC_TASK_TIMEOUT,
5495         };
5496         int status;
5497
5498         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5499         nfs4_set_sequence_privileged(&args.la_seq_args);
5500         dprintk("--> %s\n", __func__);
5501         task = rpc_run_task(&task_setup);
5502
5503         if (IS_ERR(task))
5504                 status = PTR_ERR(task);
5505         else {
5506                 status = task->tk_status;
5507                 rpc_put_task(task);
5508         }
5509         dprintk("<-- %s return %d\n", __func__, status);
5510
5511         return status;
5512 }
5513
5514 /*
5515  * Initialize the values to be used by the client in CREATE_SESSION
5516  * If nfs4_init_session set the fore channel request and response sizes,
5517  * use them.
5518  *
5519  * Set the back channel max_resp_sz_cached to zero to force the client to
5520  * always set csa_cachethis to FALSE because the current implementation
5521  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5522  */
5523 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5524 {
5525         struct nfs4_session *session = args->client->cl_session;
5526         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5527                      mxresp_sz = session->fc_target_max_resp_sz;
5528
5529         if (mxrqst_sz == 0)
5530                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5531         if (mxresp_sz == 0)
5532                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5533         /* Fore channel attributes */
5534         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5535         args->fc_attrs.max_resp_sz = mxresp_sz;
5536         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5537         args->fc_attrs.max_reqs = max_session_slots;
5538
5539         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5540                 "max_ops=%u max_reqs=%u\n",
5541                 __func__,
5542                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5543                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5544
5545         /* Back channel attributes */
5546         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5547         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5548         args->bc_attrs.max_resp_sz_cached = 0;
5549         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5550         args->bc_attrs.max_reqs = 1;
5551
5552         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5553                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5554                 __func__,
5555                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5556                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5557                 args->bc_attrs.max_reqs);
5558 }
5559
5560 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5561 {
5562         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5563         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5564
5565         if (rcvd->max_resp_sz > sent->max_resp_sz)
5566                 return -EINVAL;
5567         /*
5568          * Our requested max_ops is the minimum we need; we're not
5569          * prepared to break up compounds into smaller pieces than that.
5570          * So, no point even trying to continue if the server won't
5571          * cooperate:
5572          */
5573         if (rcvd->max_ops < sent->max_ops)
5574                 return -EINVAL;
5575         if (rcvd->max_reqs == 0)
5576                 return -EINVAL;
5577         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5578                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5579         return 0;
5580 }
5581
5582 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5583 {
5584         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5585         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5586
5587         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5588                 return -EINVAL;
5589         if (rcvd->max_resp_sz < sent->max_resp_sz)
5590                 return -EINVAL;
5591         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5592                 return -EINVAL;
5593         /* These would render the backchannel useless: */
5594         if (rcvd->max_ops != sent->max_ops)
5595                 return -EINVAL;
5596         if (rcvd->max_reqs != sent->max_reqs)
5597                 return -EINVAL;
5598         return 0;
5599 }
5600
5601 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5602                                      struct nfs4_session *session)
5603 {
5604         int ret;
5605
5606         ret = nfs4_verify_fore_channel_attrs(args, session);
5607         if (ret)
5608                 return ret;
5609         return nfs4_verify_back_channel_attrs(args, session);
5610 }
5611
5612 static int _nfs4_proc_create_session(struct nfs_client *clp,
5613                 struct rpc_cred *cred)
5614 {
5615         struct nfs4_session *session = clp->cl_session;
5616         struct nfs41_create_session_args args = {
5617                 .client = clp,
5618                 .cb_program = NFS4_CALLBACK,
5619         };
5620         struct nfs41_create_session_res res = {
5621                 .client = clp,
5622         };
5623         struct rpc_message msg = {
5624                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5625                 .rpc_argp = &args,
5626                 .rpc_resp = &res,
5627                 .rpc_cred = cred,
5628         };
5629         int status;
5630
5631         nfs4_init_channel_attrs(&args);
5632         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5633
5634         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5635
5636         if (!status) {
5637                 /* Verify the session's negotiated channel_attrs values */
5638                 status = nfs4_verify_channel_attrs(&args, session);
5639                 /* Increment the clientid slot sequence id */
5640                 clp->cl_seqid++;
5641         }
5642
5643         return status;
5644 }
5645
5646 /*
5647  * Issues a CREATE_SESSION operation to the server.
5648  * It is the responsibility of the caller to verify the session is
5649  * expired before calling this routine.
5650  */
5651 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5652 {
5653         int status;
5654         unsigned *ptr;
5655         struct nfs4_session *session = clp->cl_session;
5656
5657         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5658
5659         status = _nfs4_proc_create_session(clp, cred);
5660         if (status)
5661                 goto out;
5662
5663         /* Init or reset the session slot tables */
5664         status = nfs4_setup_session_slot_tables(session);
5665         dprintk("slot table setup returned %d\n", status);
5666         if (status)
5667                 goto out;
5668
5669         ptr = (unsigned *)&session->sess_id.data[0];
5670         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5671                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5672 out:
5673         dprintk("<-- %s\n", __func__);
5674         return status;
5675 }
5676
5677 /*
5678  * Issue the over-the-wire RPC DESTROY_SESSION.
5679  * The caller must serialize access to this routine.
5680  */
5681 int nfs4_proc_destroy_session(struct nfs4_session *session,
5682                 struct rpc_cred *cred)
5683 {
5684         struct rpc_message msg = {
5685                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5686                 .rpc_argp = session,
5687                 .rpc_cred = cred,
5688         };
5689         int status = 0;
5690
5691         dprintk("--> nfs4_proc_destroy_session\n");
5692
5693         /* session is still being setup */
5694         if (session->clp->cl_cons_state != NFS_CS_READY)
5695                 return status;
5696
5697         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5698
5699         if (status)
5700                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5701                         "Session has been destroyed regardless...\n", status);
5702
5703         dprintk("<-- nfs4_proc_destroy_session\n");
5704         return status;
5705 }
5706
5707 /*
5708  * Renew the cl_session lease.
5709  */
5710 struct nfs4_sequence_data {
5711         struct nfs_client *clp;
5712         struct nfs4_sequence_args args;
5713         struct nfs4_sequence_res res;
5714 };
5715
5716 static void nfs41_sequence_release(void *data)
5717 {
5718         struct nfs4_sequence_data *calldata = data;
5719         struct nfs_client *clp = calldata->clp;
5720
5721         if (atomic_read(&clp->cl_count) > 1)
5722                 nfs4_schedule_state_renewal(clp);
5723         nfs_put_client(clp);
5724         kfree(calldata);
5725 }
5726
5727 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5728 {
5729         switch(task->tk_status) {
5730         case -NFS4ERR_DELAY:
5731                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5732                 return -EAGAIN;
5733         default:
5734                 nfs4_schedule_lease_recovery(clp);
5735         }
5736         return 0;
5737 }
5738
5739 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5740 {
5741         struct nfs4_sequence_data *calldata = data;
5742         struct nfs_client *clp = calldata->clp;
5743
5744         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5745                 return;
5746
5747         if (task->tk_status < 0) {
5748                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5749                 if (atomic_read(&clp->cl_count) == 1)
5750                         goto out;
5751
5752                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5753                         rpc_restart_call_prepare(task);
5754                         return;
5755                 }
5756         }
5757         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5758 out:
5759         dprintk("<-- %s\n", __func__);
5760 }
5761
5762 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5763 {
5764         struct nfs4_sequence_data *calldata = data;
5765         struct nfs_client *clp = calldata->clp;
5766         struct nfs4_sequence_args *args;
5767         struct nfs4_sequence_res *res;
5768
5769         args = task->tk_msg.rpc_argp;
5770         res = task->tk_msg.rpc_resp;
5771
5772         nfs41_setup_sequence(clp->cl_session, args, res, task);
5773 }
5774
5775 static const struct rpc_call_ops nfs41_sequence_ops = {
5776         .rpc_call_done = nfs41_sequence_call_done,
5777         .rpc_call_prepare = nfs41_sequence_prepare,
5778         .rpc_release = nfs41_sequence_release,
5779 };
5780
5781 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5782                 struct rpc_cred *cred,
5783                 bool is_privileged)
5784 {
5785         struct nfs4_sequence_data *calldata;
5786         struct rpc_message msg = {
5787                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5788                 .rpc_cred = cred,
5789         };
5790         struct rpc_task_setup task_setup_data = {
5791                 .rpc_client = clp->cl_rpcclient,
5792                 .rpc_message = &msg,
5793                 .callback_ops = &nfs41_sequence_ops,
5794                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5795         };
5796
5797         if (!atomic_inc_not_zero(&clp->cl_count))
5798                 return ERR_PTR(-EIO);
5799         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5800         if (calldata == NULL) {
5801                 nfs_put_client(clp);
5802                 return ERR_PTR(-ENOMEM);
5803         }
5804         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5805         if (is_privileged)
5806                 nfs4_set_sequence_privileged(&calldata->args);
5807         msg.rpc_argp = &calldata->args;
5808         msg.rpc_resp = &calldata->res;
5809         calldata->clp = clp;
5810         task_setup_data.callback_data = calldata;
5811
5812         return rpc_run_task(&task_setup_data);
5813 }
5814
5815 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5816 {
5817         struct rpc_task *task;
5818         int ret = 0;
5819
5820         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5821                 return 0;
5822         task = _nfs41_proc_sequence(clp, cred, false);
5823         if (IS_ERR(task))
5824                 ret = PTR_ERR(task);
5825         else
5826                 rpc_put_task_async(task);
5827         dprintk("<-- %s status=%d\n", __func__, ret);
5828         return ret;
5829 }
5830
5831 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5832 {
5833         struct rpc_task *task;
5834         int ret;
5835
5836         task = _nfs41_proc_sequence(clp, cred, true);
5837         if (IS_ERR(task)) {
5838                 ret = PTR_ERR(task);
5839                 goto out;
5840         }
5841         ret = rpc_wait_for_completion_task(task);
5842         if (!ret) {
5843                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5844
5845                 if (task->tk_status == 0)
5846                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5847                 ret = task->tk_status;
5848         }
5849         rpc_put_task(task);
5850 out:
5851         dprintk("<-- %s status=%d\n", __func__, ret);
5852         return ret;
5853 }
5854
5855 struct nfs4_reclaim_complete_data {
5856         struct nfs_client *clp;
5857         struct nfs41_reclaim_complete_args arg;
5858         struct nfs41_reclaim_complete_res res;
5859 };
5860
5861 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5862 {
5863         struct nfs4_reclaim_complete_data *calldata = data;
5864
5865         nfs41_setup_sequence(calldata->clp->cl_session,
5866                         &calldata->arg.seq_args,
5867                         &calldata->res.seq_res,
5868                         task);
5869 }
5870
5871 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5872 {
5873         switch(task->tk_status) {
5874         case 0:
5875         case -NFS4ERR_COMPLETE_ALREADY:
5876         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5877                 break;
5878         case -NFS4ERR_DELAY:
5879                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5880                 /* fall through */
5881         case -NFS4ERR_RETRY_UNCACHED_REP:
5882                 return -EAGAIN;
5883         default:
5884                 nfs4_schedule_lease_recovery(clp);
5885         }
5886         return 0;
5887 }
5888
5889 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5890 {
5891         struct nfs4_reclaim_complete_data *calldata = data;
5892         struct nfs_client *clp = calldata->clp;
5893         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5894
5895         dprintk("--> %s\n", __func__);
5896         if (!nfs41_sequence_done(task, res))
5897                 return;
5898
5899         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5900                 rpc_restart_call_prepare(task);
5901                 return;
5902         }
5903         dprintk("<-- %s\n", __func__);
5904 }
5905
5906 static void nfs4_free_reclaim_complete_data(void *data)
5907 {
5908         struct nfs4_reclaim_complete_data *calldata = data;
5909
5910         kfree(calldata);
5911 }
5912
5913 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5914         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5915         .rpc_call_done = nfs4_reclaim_complete_done,
5916         .rpc_release = nfs4_free_reclaim_complete_data,
5917 };
5918
5919 /*
5920  * Issue a global reclaim complete.
5921  */
5922 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5923 {
5924         struct nfs4_reclaim_complete_data *calldata;
5925         struct rpc_task *task;
5926         struct rpc_message msg = {
5927                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5928         };
5929         struct rpc_task_setup task_setup_data = {
5930                 .rpc_client = clp->cl_rpcclient,
5931                 .rpc_message = &msg,
5932                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5933                 .flags = RPC_TASK_ASYNC,
5934         };
5935         int status = -ENOMEM;
5936
5937         dprintk("--> %s\n", __func__);
5938         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5939         if (calldata == NULL)
5940                 goto out;
5941         calldata->clp = clp;
5942         calldata->arg.one_fs = 0;
5943
5944         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5945         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
5946         msg.rpc_argp = &calldata->arg;
5947         msg.rpc_resp = &calldata->res;
5948         task_setup_data.callback_data = calldata;
5949         task = rpc_run_task(&task_setup_data);
5950         if (IS_ERR(task)) {
5951                 status = PTR_ERR(task);
5952                 goto out;
5953         }
5954         status = nfs4_wait_for_completion_rpc_task(task);
5955         if (status == 0)
5956                 status = task->tk_status;
5957         rpc_put_task(task);
5958         return 0;
5959 out:
5960         dprintk("<-- %s status=%d\n", __func__, status);
5961         return status;
5962 }
5963
5964 static void
5965 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5966 {
5967         struct nfs4_layoutget *lgp = calldata;
5968         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5969         struct nfs4_session *session = nfs4_get_session(server);
5970
5971         dprintk("--> %s\n", __func__);
5972         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5973          * right now covering the LAYOUTGET we are about to send.
5974          * However, that is not so catastrophic, and there seems
5975          * to be no way to prevent it completely.
5976          */
5977         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
5978                                 &lgp->res.seq_res, task))
5979                 return;
5980         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5981                                           NFS_I(lgp->args.inode)->layout,
5982                                           lgp->args.ctx->state)) {
5983                 rpc_exit(task, NFS4_OK);
5984         }
5985 }
5986
5987 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5988 {
5989         struct nfs4_layoutget *lgp = calldata;
5990         struct inode *inode = lgp->args.inode;
5991         struct nfs_server *server = NFS_SERVER(inode);
5992         struct pnfs_layout_hdr *lo;
5993         struct nfs4_state *state = NULL;
5994
5995         dprintk("--> %s\n", __func__);
5996
5997         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
5998                 goto out;
5999
6000         switch (task->tk_status) {
6001         case 0:
6002                 goto out;
6003         case -NFS4ERR_LAYOUTTRYLATER:
6004         case -NFS4ERR_RECALLCONFLICT:
6005                 task->tk_status = -NFS4ERR_DELAY;
6006                 break;
6007         case -NFS4ERR_EXPIRED:
6008         case -NFS4ERR_BAD_STATEID:
6009                 spin_lock(&inode->i_lock);
6010                 lo = NFS_I(inode)->layout;
6011                 if (!lo || list_empty(&lo->plh_segs)) {
6012                         spin_unlock(&inode->i_lock);
6013                         /* If the open stateid was bad, then recover it. */
6014                         state = lgp->args.ctx->state;
6015                 } else {
6016                         LIST_HEAD(head);
6017
6018                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6019                         spin_unlock(&inode->i_lock);
6020                         /* Mark the bad layout state as invalid, then
6021                          * retry using the open stateid. */
6022                         pnfs_free_lseg_list(&head);
6023                 }
6024         }
6025         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6026                 rpc_restart_call_prepare(task);
6027 out:
6028         dprintk("<-- %s\n", __func__);
6029 }
6030
6031 static size_t max_response_pages(struct nfs_server *server)
6032 {
6033         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6034         return nfs_page_array_len(0, max_resp_sz);
6035 }
6036
6037 static void nfs4_free_pages(struct page **pages, size_t size)
6038 {
6039         int i;
6040
6041         if (!pages)
6042                 return;
6043
6044         for (i = 0; i < size; i++) {
6045                 if (!pages[i])
6046                         break;
6047                 __free_page(pages[i]);
6048         }
6049         kfree(pages);
6050 }
6051
6052 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6053 {
6054         struct page **pages;
6055         int i;
6056
6057         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6058         if (!pages) {
6059                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6060                 return NULL;
6061         }
6062
6063         for (i = 0; i < size; i++) {
6064                 pages[i] = alloc_page(gfp_flags);
6065                 if (!pages[i]) {
6066                         dprintk("%s: failed to allocate page\n", __func__);
6067                         nfs4_free_pages(pages, size);
6068                         return NULL;
6069                 }
6070         }
6071
6072         return pages;
6073 }
6074
6075 static void nfs4_layoutget_release(void *calldata)
6076 {
6077         struct nfs4_layoutget *lgp = calldata;
6078         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6079         size_t max_pages = max_response_pages(server);
6080
6081         dprintk("--> %s\n", __func__);
6082         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6083         put_nfs_open_context(lgp->args.ctx);
6084         kfree(calldata);
6085         dprintk("<-- %s\n", __func__);
6086 }
6087
6088 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6089         .rpc_call_prepare = nfs4_layoutget_prepare,
6090         .rpc_call_done = nfs4_layoutget_done,
6091         .rpc_release = nfs4_layoutget_release,
6092 };
6093
6094 struct pnfs_layout_segment *
6095 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6096 {
6097         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6098         size_t max_pages = max_response_pages(server);
6099         struct rpc_task *task;
6100         struct rpc_message msg = {
6101                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6102                 .rpc_argp = &lgp->args,
6103                 .rpc_resp = &lgp->res,
6104         };
6105         struct rpc_task_setup task_setup_data = {
6106                 .rpc_client = server->client,
6107                 .rpc_message = &msg,
6108                 .callback_ops = &nfs4_layoutget_call_ops,
6109                 .callback_data = lgp,
6110                 .flags = RPC_TASK_ASYNC,
6111         };
6112         struct pnfs_layout_segment *lseg = NULL;
6113         int status = 0;
6114
6115         dprintk("--> %s\n", __func__);
6116
6117         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6118         if (!lgp->args.layout.pages) {
6119                 nfs4_layoutget_release(lgp);
6120                 return ERR_PTR(-ENOMEM);
6121         }
6122         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6123
6124         lgp->res.layoutp = &lgp->args.layout;
6125         lgp->res.seq_res.sr_slot = NULL;
6126         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6127         task = rpc_run_task(&task_setup_data);
6128         if (IS_ERR(task))
6129                 return ERR_CAST(task);
6130         status = nfs4_wait_for_completion_rpc_task(task);
6131         if (status == 0)
6132                 status = task->tk_status;
6133         if (status == 0)
6134                 lseg = pnfs_layout_process(lgp);
6135         rpc_put_task(task);
6136         dprintk("<-- %s status=%d\n", __func__, status);
6137         if (status)
6138                 return ERR_PTR(status);
6139         return lseg;
6140 }
6141
6142 static void
6143 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6144 {
6145         struct nfs4_layoutreturn *lrp = calldata;
6146
6147         dprintk("--> %s\n", __func__);
6148         nfs41_setup_sequence(lrp->clp->cl_session,
6149                         &lrp->args.seq_args,
6150                         &lrp->res.seq_res,
6151                         task);
6152 }
6153
6154 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6155 {
6156         struct nfs4_layoutreturn *lrp = calldata;
6157         struct nfs_server *server;
6158
6159         dprintk("--> %s\n", __func__);
6160
6161         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6162                 return;
6163
6164         server = NFS_SERVER(lrp->args.inode);
6165         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6166                 rpc_restart_call_prepare(task);
6167                 return;
6168         }
6169         dprintk("<-- %s\n", __func__);
6170 }
6171
6172 static void nfs4_layoutreturn_release(void *calldata)
6173 {
6174         struct nfs4_layoutreturn *lrp = calldata;
6175         struct pnfs_layout_hdr *lo = lrp->args.layout;
6176
6177         dprintk("--> %s\n", __func__);
6178         spin_lock(&lo->plh_inode->i_lock);
6179         if (lrp->res.lrs_present)
6180                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6181         lo->plh_block_lgets--;
6182         spin_unlock(&lo->plh_inode->i_lock);
6183         pnfs_put_layout_hdr(lrp->args.layout);
6184         kfree(calldata);
6185         dprintk("<-- %s\n", __func__);
6186 }
6187
6188 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6189         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6190         .rpc_call_done = nfs4_layoutreturn_done,
6191         .rpc_release = nfs4_layoutreturn_release,
6192 };
6193
6194 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6195 {
6196         struct rpc_task *task;
6197         struct rpc_message msg = {
6198                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6199                 .rpc_argp = &lrp->args,
6200                 .rpc_resp = &lrp->res,
6201         };
6202         struct rpc_task_setup task_setup_data = {
6203                 .rpc_client = lrp->clp->cl_rpcclient,
6204                 .rpc_message = &msg,
6205                 .callback_ops = &nfs4_layoutreturn_call_ops,
6206                 .callback_data = lrp,
6207         };
6208         int status;
6209
6210         dprintk("--> %s\n", __func__);
6211         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6212         task = rpc_run_task(&task_setup_data);
6213         if (IS_ERR(task))
6214                 return PTR_ERR(task);
6215         status = task->tk_status;
6216         dprintk("<-- %s status=%d\n", __func__, status);
6217         rpc_put_task(task);
6218         return status;
6219 }
6220
6221 /*
6222  * Retrieve the list of Data Server devices from the MDS.
6223  */
6224 static int _nfs4_getdevicelist(struct nfs_server *server,
6225                                     const struct nfs_fh *fh,
6226                                     struct pnfs_devicelist *devlist)
6227 {
6228         struct nfs4_getdevicelist_args args = {
6229                 .fh = fh,
6230                 .layoutclass = server->pnfs_curr_ld->id,
6231         };
6232         struct nfs4_getdevicelist_res res = {
6233                 .devlist = devlist,
6234         };
6235         struct rpc_message msg = {
6236                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6237                 .rpc_argp = &args,
6238                 .rpc_resp = &res,
6239         };
6240         int status;
6241
6242         dprintk("--> %s\n", __func__);
6243         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6244                                 &res.seq_res, 0);
6245         dprintk("<-- %s status=%d\n", __func__, status);
6246         return status;
6247 }
6248
6249 int nfs4_proc_getdevicelist(struct nfs_server *server,
6250                             const struct nfs_fh *fh,
6251                             struct pnfs_devicelist *devlist)
6252 {
6253         struct nfs4_exception exception = { };
6254         int err;
6255
6256         do {
6257                 err = nfs4_handle_exception(server,
6258                                 _nfs4_getdevicelist(server, fh, devlist),
6259                                 &exception);
6260         } while (exception.retry);
6261
6262         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6263                 err, devlist->num_devs);
6264
6265         return err;
6266 }
6267 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6268
6269 static int
6270 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6271 {
6272         struct nfs4_getdeviceinfo_args args = {
6273                 .pdev = pdev,
6274         };
6275         struct nfs4_getdeviceinfo_res res = {
6276                 .pdev = pdev,
6277         };
6278         struct rpc_message msg = {
6279                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6280                 .rpc_argp = &args,
6281                 .rpc_resp = &res,
6282         };
6283         int status;
6284
6285         dprintk("--> %s\n", __func__);
6286         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6287         dprintk("<-- %s status=%d\n", __func__, status);
6288
6289         return status;
6290 }
6291
6292 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6293 {
6294         struct nfs4_exception exception = { };
6295         int err;
6296
6297         do {
6298                 err = nfs4_handle_exception(server,
6299                                         _nfs4_proc_getdeviceinfo(server, pdev),
6300                                         &exception);
6301         } while (exception.retry);
6302         return err;
6303 }
6304 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6305
6306 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6307 {
6308         struct nfs4_layoutcommit_data *data = calldata;
6309         struct nfs_server *server = NFS_SERVER(data->args.inode);
6310         struct nfs4_session *session = nfs4_get_session(server);
6311
6312         nfs41_setup_sequence(session,
6313                         &data->args.seq_args,
6314                         &data->res.seq_res,
6315                         task);
6316 }
6317
6318 static void
6319 nfs4_layoutcommit_done(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
6324         if (!nfs41_sequence_done(task, &data->res.seq_res))
6325                 return;
6326
6327         switch (task->tk_status) { /* Just ignore these failures */
6328         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6329         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6330         case -NFS4ERR_BADLAYOUT:     /* no layout */
6331         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6332                 task->tk_status = 0;
6333                 break;
6334         case 0:
6335                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6336                                                    data->res.fattr);
6337                 break;
6338         default:
6339                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6340                         rpc_restart_call_prepare(task);
6341                         return;
6342                 }
6343         }
6344 }
6345
6346 static void nfs4_layoutcommit_release(void *calldata)
6347 {
6348         struct nfs4_layoutcommit_data *data = calldata;
6349         struct pnfs_layout_segment *lseg, *tmp;
6350         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6351
6352         pnfs_cleanup_layoutcommit(data);
6353         /* Matched by references in pnfs_set_layoutcommit */
6354         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6355                 list_del_init(&lseg->pls_lc_list);
6356                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6357                                        &lseg->pls_flags))
6358                         pnfs_put_lseg(lseg);
6359         }
6360
6361         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6362         smp_mb__after_clear_bit();
6363         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6364
6365         put_rpccred(data->cred);
6366         kfree(data);
6367 }
6368
6369 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6370         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6371         .rpc_call_done = nfs4_layoutcommit_done,
6372         .rpc_release = nfs4_layoutcommit_release,
6373 };
6374
6375 int
6376 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6377 {
6378         struct rpc_message msg = {
6379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6380                 .rpc_argp = &data->args,
6381                 .rpc_resp = &data->res,
6382                 .rpc_cred = data->cred,
6383         };
6384         struct rpc_task_setup task_setup_data = {
6385                 .task = &data->task,
6386                 .rpc_client = NFS_CLIENT(data->args.inode),
6387                 .rpc_message = &msg,
6388                 .callback_ops = &nfs4_layoutcommit_ops,
6389                 .callback_data = data,
6390                 .flags = RPC_TASK_ASYNC,
6391         };
6392         struct rpc_task *task;
6393         int status = 0;
6394
6395         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6396                 "lbw: %llu inode %lu\n",
6397                 data->task.tk_pid, sync,
6398                 data->args.lastbytewritten,
6399                 data->args.inode->i_ino);
6400
6401         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6402         task = rpc_run_task(&task_setup_data);
6403         if (IS_ERR(task))
6404                 return PTR_ERR(task);
6405         if (sync == false)
6406                 goto out;
6407         status = nfs4_wait_for_completion_rpc_task(task);
6408         if (status != 0)
6409                 goto out;
6410         status = task->tk_status;
6411 out:
6412         dprintk("%s: status %d\n", __func__, status);
6413         rpc_put_task(task);
6414         return status;
6415 }
6416
6417 static int
6418 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6419                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6420 {
6421         struct nfs41_secinfo_no_name_args args = {
6422                 .style = SECINFO_STYLE_CURRENT_FH,
6423         };
6424         struct nfs4_secinfo_res res = {
6425                 .flavors = flavors,
6426         };
6427         struct rpc_message msg = {
6428                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6429                 .rpc_argp = &args,
6430                 .rpc_resp = &res,
6431         };
6432         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6433 }
6434
6435 static int
6436 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6437                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6438 {
6439         struct nfs4_exception exception = { };
6440         int err;
6441         do {
6442                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6443                 switch (err) {
6444                 case 0:
6445                 case -NFS4ERR_WRONGSEC:
6446                 case -NFS4ERR_NOTSUPP:
6447                         goto out;
6448                 default:
6449                         err = nfs4_handle_exception(server, err, &exception);
6450                 }
6451         } while (exception.retry);
6452 out:
6453         return err;
6454 }
6455
6456 static int
6457 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6458                     struct nfs_fsinfo *info)
6459 {
6460         int err;
6461         struct page *page;
6462         rpc_authflavor_t flavor;
6463         struct nfs4_secinfo_flavors *flavors;
6464
6465         page = alloc_page(GFP_KERNEL);
6466         if (!page) {
6467                 err = -ENOMEM;
6468                 goto out;
6469         }
6470
6471         flavors = page_address(page);
6472         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6473
6474         /*
6475          * Fall back on "guess and check" method if
6476          * the server doesn't support SECINFO_NO_NAME
6477          */
6478         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6479                 err = nfs4_find_root_sec(server, fhandle, info);
6480                 goto out_freepage;
6481         }
6482         if (err)
6483                 goto out_freepage;
6484
6485         flavor = nfs_find_best_sec(flavors);
6486         if (err == 0)
6487                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6488
6489 out_freepage:
6490         put_page(page);
6491         if (err == -EACCES)
6492                 return -EPERM;
6493 out:
6494         return err;
6495 }
6496
6497 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6498 {
6499         int status;
6500         struct nfs41_test_stateid_args args = {
6501                 .stateid = stateid,
6502         };
6503         struct nfs41_test_stateid_res res;
6504         struct rpc_message msg = {
6505                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6506                 .rpc_argp = &args,
6507                 .rpc_resp = &res,
6508         };
6509
6510         dprintk("NFS call  test_stateid %p\n", stateid);
6511         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6512         nfs4_set_sequence_privileged(&args.seq_args);
6513         status = nfs4_call_sync_sequence(server->client, server, &msg,
6514                         &args.seq_args, &res.seq_res);
6515         if (status != NFS_OK) {
6516                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6517                 return status;
6518         }
6519         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6520         return -res.status;
6521 }
6522
6523 /**
6524  * nfs41_test_stateid - perform a TEST_STATEID operation
6525  *
6526  * @server: server / transport on which to perform the operation
6527  * @stateid: state ID to test
6528  *
6529  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6530  * Otherwise a negative NFS4ERR value is returned if the operation
6531  * failed or the state ID is not currently valid.
6532  */
6533 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6534 {
6535         struct nfs4_exception exception = { };
6536         int err;
6537         do {
6538                 err = _nfs41_test_stateid(server, stateid);
6539                 if (err != -NFS4ERR_DELAY)
6540                         break;
6541                 nfs4_handle_exception(server, err, &exception);
6542         } while (exception.retry);
6543         return err;
6544 }
6545
6546 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6547 {
6548         struct nfs41_free_stateid_args args = {
6549                 .stateid = stateid,
6550         };
6551         struct nfs41_free_stateid_res res;
6552         struct rpc_message msg = {
6553                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6554                 .rpc_argp = &args,
6555                 .rpc_resp = &res,
6556         };
6557         int status;
6558
6559         dprintk("NFS call  free_stateid %p\n", stateid);
6560         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6561         nfs4_set_sequence_privileged(&args.seq_args);
6562         status = nfs4_call_sync_sequence(server->client, server, &msg,
6563                         &args.seq_args, &res.seq_res);
6564         dprintk("NFS reply free_stateid: %d\n", status);
6565         return status;
6566 }
6567
6568 /**
6569  * nfs41_free_stateid - perform a FREE_STATEID operation
6570  *
6571  * @server: server / transport on which to perform the operation
6572  * @stateid: state ID to release
6573  *
6574  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6575  * negative NFS4ERR value is returned.
6576  */
6577 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6578 {
6579         struct nfs4_exception exception = { };
6580         int err;
6581         do {
6582                 err = _nfs4_free_stateid(server, stateid);
6583                 if (err != -NFS4ERR_DELAY)
6584                         break;
6585                 nfs4_handle_exception(server, err, &exception);
6586         } while (exception.retry);
6587         return err;
6588 }
6589
6590 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6591                 const nfs4_stateid *s2)
6592 {
6593         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6594                 return false;
6595
6596         if (s1->seqid == s2->seqid)
6597                 return true;
6598         if (s1->seqid == 0 || s2->seqid == 0)
6599                 return true;
6600
6601         return false;
6602 }
6603
6604 #endif /* CONFIG_NFS_V4_1 */
6605
6606 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6607                 const nfs4_stateid *s2)
6608 {
6609         return nfs4_stateid_match(s1, s2);
6610 }
6611
6612
6613 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6614         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6615         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6616         .recover_open   = nfs4_open_reclaim,
6617         .recover_lock   = nfs4_lock_reclaim,
6618         .establish_clid = nfs4_init_clientid,
6619         .get_clid_cred  = nfs4_get_setclientid_cred,
6620         .detect_trunking = nfs40_discover_server_trunking,
6621 };
6622
6623 #if defined(CONFIG_NFS_V4_1)
6624 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6625         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6626         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6627         .recover_open   = nfs4_open_reclaim,
6628         .recover_lock   = nfs4_lock_reclaim,
6629         .establish_clid = nfs41_init_clientid,
6630         .get_clid_cred  = nfs4_get_exchange_id_cred,
6631         .reclaim_complete = nfs41_proc_reclaim_complete,
6632         .detect_trunking = nfs41_discover_server_trunking,
6633 };
6634 #endif /* CONFIG_NFS_V4_1 */
6635
6636 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6637         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6638         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6639         .recover_open   = nfs4_open_expired,
6640         .recover_lock   = nfs4_lock_expired,
6641         .establish_clid = nfs4_init_clientid,
6642         .get_clid_cred  = nfs4_get_setclientid_cred,
6643 };
6644
6645 #if defined(CONFIG_NFS_V4_1)
6646 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6647         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6648         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6649         .recover_open   = nfs41_open_expired,
6650         .recover_lock   = nfs41_lock_expired,
6651         .establish_clid = nfs41_init_clientid,
6652         .get_clid_cred  = nfs4_get_exchange_id_cred,
6653 };
6654 #endif /* CONFIG_NFS_V4_1 */
6655
6656 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6657         .sched_state_renewal = nfs4_proc_async_renew,
6658         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6659         .renew_lease = nfs4_proc_renew,
6660 };
6661
6662 #if defined(CONFIG_NFS_V4_1)
6663 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6664         .sched_state_renewal = nfs41_proc_async_sequence,
6665         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6666         .renew_lease = nfs4_proc_sequence,
6667 };
6668 #endif
6669
6670 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6671         .minor_version = 0,
6672         .call_sync = _nfs4_call_sync,
6673         .match_stateid = nfs4_match_stateid,
6674         .find_root_sec = nfs4_find_root_sec,
6675         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6676         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6677         .state_renewal_ops = &nfs40_state_renewal_ops,
6678 };
6679
6680 #if defined(CONFIG_NFS_V4_1)
6681 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6682         .minor_version = 1,
6683         .call_sync = nfs4_call_sync_sequence,
6684         .match_stateid = nfs41_match_stateid,
6685         .find_root_sec = nfs41_find_root_sec,
6686         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6687         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6688         .state_renewal_ops = &nfs41_state_renewal_ops,
6689 };
6690 #endif
6691
6692 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6693         [0] = &nfs_v4_0_minor_ops,
6694 #if defined(CONFIG_NFS_V4_1)
6695         [1] = &nfs_v4_1_minor_ops,
6696 #endif
6697 };
6698
6699 const struct inode_operations nfs4_dir_inode_operations = {
6700         .create         = nfs_create,
6701         .lookup         = nfs_lookup,
6702         .atomic_open    = nfs_atomic_open,
6703         .link           = nfs_link,
6704         .unlink         = nfs_unlink,
6705         .symlink        = nfs_symlink,
6706         .mkdir          = nfs_mkdir,
6707         .rmdir          = nfs_rmdir,
6708         .mknod          = nfs_mknod,
6709         .rename         = nfs_rename,
6710         .permission     = nfs_permission,
6711         .getattr        = nfs_getattr,
6712         .setattr        = nfs_setattr,
6713         .getxattr       = generic_getxattr,
6714         .setxattr       = generic_setxattr,
6715         .listxattr      = generic_listxattr,
6716         .removexattr    = generic_removexattr,
6717 };
6718
6719 static const struct inode_operations nfs4_file_inode_operations = {
6720         .permission     = nfs_permission,
6721         .getattr        = nfs_getattr,
6722         .setattr        = nfs_setattr,
6723         .getxattr       = generic_getxattr,
6724         .setxattr       = generic_setxattr,
6725         .listxattr      = generic_listxattr,
6726         .removexattr    = generic_removexattr,
6727 };
6728
6729 const struct nfs_rpc_ops nfs_v4_clientops = {
6730         .version        = 4,                    /* protocol version */
6731         .dentry_ops     = &nfs4_dentry_operations,
6732         .dir_inode_ops  = &nfs4_dir_inode_operations,
6733         .file_inode_ops = &nfs4_file_inode_operations,
6734         .file_ops       = &nfs4_file_operations,
6735         .getroot        = nfs4_proc_get_root,
6736         .submount       = nfs4_submount,
6737         .try_mount      = nfs4_try_mount,
6738         .getattr        = nfs4_proc_getattr,
6739         .setattr        = nfs4_proc_setattr,
6740         .lookup         = nfs4_proc_lookup,
6741         .access         = nfs4_proc_access,
6742         .readlink       = nfs4_proc_readlink,
6743         .create         = nfs4_proc_create,
6744         .remove         = nfs4_proc_remove,
6745         .unlink_setup   = nfs4_proc_unlink_setup,
6746         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6747         .unlink_done    = nfs4_proc_unlink_done,
6748         .rename         = nfs4_proc_rename,
6749         .rename_setup   = nfs4_proc_rename_setup,
6750         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6751         .rename_done    = nfs4_proc_rename_done,
6752         .link           = nfs4_proc_link,
6753         .symlink        = nfs4_proc_symlink,
6754         .mkdir          = nfs4_proc_mkdir,
6755         .rmdir          = nfs4_proc_remove,
6756         .readdir        = nfs4_proc_readdir,
6757         .mknod          = nfs4_proc_mknod,
6758         .statfs         = nfs4_proc_statfs,
6759         .fsinfo         = nfs4_proc_fsinfo,
6760         .pathconf       = nfs4_proc_pathconf,
6761         .set_capabilities = nfs4_server_capabilities,
6762         .decode_dirent  = nfs4_decode_dirent,
6763         .read_setup     = nfs4_proc_read_setup,
6764         .read_pageio_init = pnfs_pageio_init_read,
6765         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6766         .read_done      = nfs4_read_done,
6767         .write_setup    = nfs4_proc_write_setup,
6768         .write_pageio_init = pnfs_pageio_init_write,
6769         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6770         .write_done     = nfs4_write_done,
6771         .commit_setup   = nfs4_proc_commit_setup,
6772         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6773         .commit_done    = nfs4_commit_done,
6774         .lock           = nfs4_proc_lock,
6775         .clear_acl_cache = nfs4_zap_acl_attr,
6776         .close_context  = nfs4_close_context,
6777         .open_context   = nfs4_atomic_open,
6778         .have_delegation = nfs4_have_delegation,
6779         .return_delegation = nfs4_inode_return_delegation,
6780         .alloc_client   = nfs4_alloc_client,
6781         .init_client    = nfs4_init_client,
6782         .free_client    = nfs4_free_client,
6783         .create_server  = nfs4_create_server,
6784         .clone_server   = nfs_clone_server,
6785 };
6786
6787 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6788         .prefix = XATTR_NAME_NFSV4_ACL,
6789         .list   = nfs4_xattr_list_nfs4_acl,
6790         .get    = nfs4_xattr_get_nfs4_acl,
6791         .set    = nfs4_xattr_set_nfs4_acl,
6792 };
6793
6794 const struct xattr_handler *nfs4_xattr_handlers[] = {
6795         &nfs4_xattr_nfs4_acl_handler,
6796         NULL
6797 };
6798
6799 /*
6800  * Local variables:
6801  *  c-basic-offset: 8
6802  * End:
6803  */