fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96         case -NFS4ERR_LAYOUTTRYLATER:
  97         case -NFS4ERR_RECALLCONFLICT:
  98                 return -EREMOTEIO;
  99         case -NFS4ERR_WRONGSEC:
 100                 return -EPERM;
 101         case -NFS4ERR_BADOWNER:
 102         case -NFS4ERR_BADNAME:
 103                 return -EINVAL;
 104         case -NFS4ERR_SHARE_DENIED:
 105                 return -EACCES;
 106         case -NFS4ERR_MINOR_VERS_MISMATCH:
 107                 return -EPROTONOSUPPORT;
 108         case -NFS4ERR_ACCESS:
 109                 return -EACCES;
 110         case -NFS4ERR_FILE_OPEN:
 111                 return -EBUSY;
 112         default:
 113                 dprintk("%s could not handle NFSv4 error %d\n",
 114                                 __func__, -err);
 115                 break;
 116         }
 117         return -EIO;
 118 }
 119
 120 /*
 121  * This is our standard bitmap for GETATTR requests.
 122  */
 123 const u32 nfs4_fattr_bitmap[3] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138 };
 139
 140 static const u32 nfs4_pnfs_open_bitmap[3] = {
 141         FATTR4_WORD0_TYPE
 142         | FATTR4_WORD0_CHANGE
 143         | FATTR4_WORD0_SIZE
 144         | FATTR4_WORD0_FSID
 145         | FATTR4_WORD0_FILEID,
 146         FATTR4_WORD1_MODE
 147         | FATTR4_WORD1_NUMLINKS
 148         | FATTR4_WORD1_OWNER
 149         | FATTR4_WORD1_OWNER_GROUP
 150         | FATTR4_WORD1_RAWDEV
 151         | FATTR4_WORD1_SPACE_USED
 152         | FATTR4_WORD1_TIME_ACCESS
 153         | FATTR4_WORD1_TIME_METADATA
 154         | FATTR4_WORD1_TIME_MODIFY,
 155         FATTR4_WORD2_MDSTHRESHOLD
 156 };
 157
 158 static const u32 nfs4_open_noattr_bitmap[3] = {
 159         FATTR4_WORD0_TYPE
 160         | FATTR4_WORD0_CHANGE
 161         | FATTR4_WORD0_FILEID,
 162 };
 163
 164 const u32 nfs4_statfs_bitmap[2] = {
 165         FATTR4_WORD0_FILES_AVAIL
 166         | FATTR4_WORD0_FILES_FREE
 167         | FATTR4_WORD0_FILES_TOTAL,
 168         FATTR4_WORD1_SPACE_AVAIL
 169         | FATTR4_WORD1_SPACE_FREE
 170         | FATTR4_WORD1_SPACE_TOTAL
 171 };
 172
 173 const u32 nfs4_pathconf_bitmap[2] = {
 174         FATTR4_WORD0_MAXLINK
 175         | FATTR4_WORD0_MAXNAME,
 176         0
 177 };
 178
 179 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 180                         | FATTR4_WORD0_MAXREAD
 181                         | FATTR4_WORD0_MAXWRITE
 182                         | FATTR4_WORD0_LEASE_TIME,
 183                         FATTR4_WORD1_TIME_DELTA
 184                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 185                         FATTR4_WORD2_LAYOUT_BLKSIZE
 186 };
 187
 188 const u32 nfs4_fs_locations_bitmap[2] = {
 189         FATTR4_WORD0_TYPE
 190         | FATTR4_WORD0_CHANGE
 191         | FATTR4_WORD0_SIZE
 192         | FATTR4_WORD0_FSID
 193         | FATTR4_WORD0_FILEID
 194         | FATTR4_WORD0_FS_LOCATIONS,
 195         FATTR4_WORD1_MODE
 196         | FATTR4_WORD1_NUMLINKS
 197         | FATTR4_WORD1_OWNER
 198         | FATTR4_WORD1_OWNER_GROUP
 199         | FATTR4_WORD1_RAWDEV
 200         | FATTR4_WORD1_SPACE_USED
 201         | FATTR4_WORD1_TIME_ACCESS
 202         | FATTR4_WORD1_TIME_METADATA
 203         | FATTR4_WORD1_TIME_MODIFY
 204         | FATTR4_WORD1_MOUNTED_ON_FILEID
 205 };
 206
 207 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 208                 struct nfs4_readdir_arg *readdir)
 209 {
 210         __be32 *start, *p;
 211
 212         if (cookie > 2) {
 213                 readdir->cookie = cookie;
 214                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 215                 return;
 216         }
 217
 218         readdir->cookie = 0;
 219         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 220         if (cookie == 2)
 221                 return;
 222
 223         /*
 224          * NFSv4 servers do not return entries for '.' and '..'
 225          * Therefore, we fake these entries here.  We let '.'
 226          * have cookie 0 and '..' have cookie 1.  Note that
 227          * when talking to the server, we always send cookie 0
 228          * instead of 1 or 2.
 229          */
 230         start = p = kmap_atomic(*readdir->pages);
 231
 232         if (cookie == 0) {
 233                 *p++ = xdr_one;                                  /* next */
 234                 *p++ = xdr_zero;                   /* cookie, first word */
 235                 *p++ = xdr_one;                   /* cookie, second word */
 236                 *p++ = xdr_one;                             /* entry len */
 237                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 238                 p++;
 239                 *p++ = xdr_one;                         /* bitmap length */
 240                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 241                 *p++ = htonl(8);              /* attribute buffer length */
 242                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 243         }
 244
 245         *p++ = xdr_one;                                  /* next */
 246         *p++ = xdr_zero;                   /* cookie, first word */
 247         *p++ = xdr_two;                   /* cookie, second word */
 248         *p++ = xdr_two;                             /* entry len */
 249         memcpy(p, "..\0\0", 4);                         /* entry */
 250         p++;
 251         *p++ = xdr_one;                         /* bitmap length */
 252         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 253         *p++ = htonl(8);              /* attribute buffer length */
 254         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 255
 256         readdir->pgbase = (char *)p - (char *)start;
 257         readdir->count -= readdir->pgbase;
 258         kunmap_atomic(start);
 259 }
 260
 261 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 262 {
 263         int res = 0;
 264
 265         might_sleep();
 266
 267         if (*timeout <= 0)
 268                 *timeout = NFS4_POLL_RETRY_MIN;
 269         if (*timeout > NFS4_POLL_RETRY_MAX)
 270                 *timeout = NFS4_POLL_RETRY_MAX;
 271         freezable_schedule_timeout_killable(*timeout);
 272         if (fatal_signal_pending(current))
 273                 res = -ERESTARTSYS;
 274         *timeout <<= 1;
 275         return res;
 276 }
 277
 278 /* This is the error handling routine for processes that are allowed
 279  * to sleep.
 280  */
 281 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 282 {
 283         struct nfs_client *clp = server->nfs_client;
 284         struct nfs4_state *state = exception->state;
 285         struct inode *inode = exception->inode;
 286         int ret = errorcode;
 287
 288         exception->retry = 0;
 289         switch(errorcode) {
 290                 case 0:
 291                         return 0;
 292                 case -NFS4ERR_OPENMODE:
 293                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 294                                 nfs4_inode_return_delegation(inode);
 295                                 exception->retry = 1;
 296                                 return 0;
 297                         }
 298                         if (state == NULL)
 299                                 break;
 300                         ret = nfs4_schedule_stateid_recovery(server, state);
 301                         if (ret < 0)
 302                                 break;
 303                         goto wait_on_recovery;
 304                 case -NFS4ERR_DELEG_REVOKED:
 305                 case -NFS4ERR_ADMIN_REVOKED:
 306                 case -NFS4ERR_BAD_STATEID:
 307                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 308                                 nfs_remove_bad_delegation(inode);
 309                                 exception->retry = 1;
 310                                 break;
 311                         }
 312                         if (state == NULL)
 313                                 break;
 314                         ret = nfs4_schedule_stateid_recovery(server, state);
 315                         if (ret < 0)
 316                                 break;
 317                         goto wait_on_recovery;
 318                 case -NFS4ERR_EXPIRED:
 319                         if (state != NULL) {
 320                                 ret = nfs4_schedule_stateid_recovery(server, state);
 321                                 if (ret < 0)
 322                                         break;
 323                         }
 324                 case -NFS4ERR_STALE_STATEID:
 325                 case -NFS4ERR_STALE_CLIENTID:
 326                         nfs4_schedule_lease_recovery(clp);
 327                         goto wait_on_recovery;
 328 #if defined(CONFIG_NFS_V4_1)
 329                 case -NFS4ERR_BADSESSION:
 330                 case -NFS4ERR_BADSLOT:
 331                 case -NFS4ERR_BAD_HIGH_SLOT:
 332                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 333                 case -NFS4ERR_DEADSESSION:
 334                 case -NFS4ERR_SEQ_FALSE_RETRY:
 335                 case -NFS4ERR_SEQ_MISORDERED:
 336                         dprintk("%s ERROR: %d Reset session\n", __func__,
 337                                 errorcode);
 338                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 339                         goto wait_on_recovery;
 340 #endif /* defined(CONFIG_NFS_V4_1) */
 341                 case -NFS4ERR_FILE_OPEN:
 342                         if (exception->timeout > HZ) {
 343                                 /* We have retried a decent amount, time to
 344                                  * fail
 345                                  */
 346                                 ret = -EBUSY;
 347                                 break;
 348                         }
 349                 case -NFS4ERR_GRACE:
 350                 case -NFS4ERR_DELAY:
 351                         ret = nfs4_delay(server->client, &exception->timeout);
 352                         if (ret != 0)
 353                                 break;
 354                 case -NFS4ERR_RETRY_UNCACHED_REP:
 355                 case -NFS4ERR_OLD_STATEID:
 356                         exception->retry = 1;
 357                         break;
 358                 case -NFS4ERR_BADOWNER:
 359                         /* The following works around a Linux server bug! */
 360                 case -NFS4ERR_BADNAME:
 361                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 362                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 363                                 exception->retry = 1;
 364                                 printk(KERN_WARNING "NFS: v4 server %s "
 365                                                 "does not accept raw "
 366                                                 "uid/gids. "
 367                                                 "Reenabling the idmapper.\n",
 368                                                 server->nfs_client->cl_hostname);
 369                         }
 370         }
 371         /* We failed to handle the error */
 372         return nfs4_map_errors(ret);
 373 wait_on_recovery:
 374         ret = nfs4_wait_clnt_recover(clp);
 375         if (ret == 0)
 376                 exception->retry = 1;
 377         return ret;
 378 }
 379
 380
 381 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 382 {
 383         spin_lock(&clp->cl_lock);
 384         if (time_before(clp->cl_last_renewal,timestamp))
 385                 clp->cl_last_renewal = timestamp;
 386         spin_unlock(&clp->cl_lock);
 387 }
 388
 389 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 390 {
 391         do_renew_lease(server->nfs_client, timestamp);
 392 }
 393
 394 #if defined(CONFIG_NFS_V4_1)
 395
 396 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 397 {
 398         struct nfs4_session *session;
 399         struct nfs4_slot_table *tbl;
 400         bool send_new_highest_used_slotid = false;
 401
 402         if (!res->sr_slot) {
 403                 /* just wake up the next guy waiting since
 404                  * we may have not consumed a slot after all */
 405                 dprintk("%s: No slot\n", __func__);
 406                 return;
 407         }
 408         tbl = res->sr_slot->table;
 409         session = tbl->session;
 410
 411         spin_lock(&tbl->slot_tbl_lock);
 412         /* Be nice to the server: try to ensure that the last transmitted
 413          * value for highest_user_slotid <= target_highest_slotid
 414          */
 415         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 416                 send_new_highest_used_slotid = true;
 417
 418         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 419                 send_new_highest_used_slotid = false;
 420                 goto out_unlock;
 421         }
 422         nfs4_free_slot(tbl, res->sr_slot);
 423
 424         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 425                 send_new_highest_used_slotid = false;
 426 out_unlock:
 427         spin_unlock(&tbl->slot_tbl_lock);
 428         res->sr_slot = NULL;
 429         if (send_new_highest_used_slotid)
 430                 nfs41_server_notify_highest_slotid_update(session->clp);
 431 }
 432
 433 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 434 {
 435         struct nfs4_session *session;
 436         struct nfs4_slot *slot;
 437         struct nfs_client *clp;
 438         bool interrupted = false;
 439         int ret = 1;
 440
 441         /* don't increment the sequence number if the task wasn't sent */
 442         if (!RPC_WAS_SENT(task))
 443                 goto out;
 444
 445         slot = res->sr_slot;
 446         session = slot->table->session;
 447
 448         if (slot->interrupted) {
 449                 slot->interrupted = 0;
 450                 interrupted = true;
 451         }
 452
 453         /* Check the SEQUENCE operation status */
 454         switch (res->sr_status) {
 455         case 0:
 456                 /* Update the slot's sequence and clientid lease timer */
 457                 ++slot->seq_nr;
 458                 clp = session->clp;
 459                 do_renew_lease(clp, res->sr_timestamp);
 460                 /* Check sequence flags */
 461                 if (res->sr_status_flags != 0)
 462                         nfs4_schedule_lease_recovery(clp);
 463                 nfs41_update_target_slotid(slot->table, slot, res);
 464                 break;
 465         case 1:
 466                 /*
 467                  * sr_status remains 1 if an RPC level error occurred.
 468                  * The server may or may not have processed the sequence
 469                  * operation..
 470                  * Mark the slot as having hosted an interrupted RPC call.
 471                  */
 472                 slot->interrupted = 1;
 473                 goto out;
 474         case -NFS4ERR_DELAY:
 475                 /* The server detected a resend of the RPC call and
 476                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 477                  * of RFC5661.
 478                  */
 479                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 480                         __func__,
 481                         slot->slot_nr,
 482                         slot->seq_nr);
 483                 goto out_retry;
 484         case -NFS4ERR_BADSLOT:
 485                 /*
 486                  * The slot id we used was probably retired. Try again
 487                  * using a different slot id.
 488                  */
 489                 goto retry_nowait;
 490         case -NFS4ERR_SEQ_MISORDERED:
 491                 /*
 492                  * Was the last operation on this sequence interrupted?
 493                  * If so, retry after bumping the sequence number.
 494                  */
 495                 if (interrupted) {
 496                         ++slot->seq_nr;
 497                         goto retry_nowait;
 498                 }
 499                 /*
 500                  * Could this slot have been previously retired?
 501                  * If so, then the server may be expecting seq_nr = 1!
 502                  */
 503                 if (slot->seq_nr != 1) {
 504                         slot->seq_nr = 1;
 505                         goto retry_nowait;
 506                 }
 507                 break;
 508         case -NFS4ERR_SEQ_FALSE_RETRY:
 509                 ++slot->seq_nr;
 510                 goto retry_nowait;
 511         default:
 512                 /* Just update the slot sequence no. */
 513                 ++slot->seq_nr;
 514         }
 515 out:
 516         /* The session may be reset by one of the error handlers. */
 517         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 518         nfs41_sequence_free_slot(res);
 519         return ret;
 520 retry_nowait:
 521         if (rpc_restart_call_prepare(task)) {
 522                 task->tk_status = 0;
 523                 ret = 0;
 524         }
 525         goto out;
 526 out_retry:
 527         if (!rpc_restart_call(task))
 528                 goto out;
 529         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 530         return 0;
 531 }
 532
 533 static int nfs4_sequence_done(struct rpc_task *task,
 534                                struct nfs4_sequence_res *res)
 535 {
 536         if (res->sr_slot == NULL)
 537                 return 1;
 538         return nfs41_sequence_done(task, res);
 539 }
 540
 541 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 542                 struct nfs4_sequence_res *res, int cache_reply)
 543 {
 544         args->sa_slot = NULL;
 545         args->sa_cache_this = 0;
 546         args->sa_privileged = 0;
 547         if (cache_reply)
 548                 args->sa_cache_this = 1;
 549         res->sr_slot = NULL;
 550 }
 551
 552 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 553 {
 554         args->sa_privileged = 1;
 555 }
 556
 557 int nfs41_setup_sequence(struct nfs4_session *session,
 558                                 struct nfs4_sequence_args *args,
 559                                 struct nfs4_sequence_res *res,
 560                                 struct rpc_task *task)
 561 {
 562         struct nfs4_slot *slot;
 563         struct nfs4_slot_table *tbl;
 564
 565         dprintk("--> %s\n", __func__);
 566         /* slot already allocated? */
 567         if (res->sr_slot != NULL)
 568                 goto out_success;
 569
 570         tbl = &session->fc_slot_table;
 571
 572         task->tk_timeout = 0;
 573
 574         spin_lock(&tbl->slot_tbl_lock);
 575         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 576             !args->sa_privileged) {
 577                 /* The state manager will wait until the slot table is empty */
 578                 dprintk("%s session is draining\n", __func__);
 579                 goto out_sleep;
 580         }
 581
 582         slot = nfs4_alloc_slot(tbl);
 583         if (IS_ERR(slot)) {
 584                 /* If out of memory, try again in 1/4 second */
 585                 if (slot == ERR_PTR(-ENOMEM))
 586                         task->tk_timeout = HZ >> 2;
 587                 dprintk("<-- %s: no free slots\n", __func__);
 588                 goto out_sleep;
 589         }
 590         spin_unlock(&tbl->slot_tbl_lock);
 591
 592         args->sa_slot = slot;
 593
 594         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 595                         slot->slot_nr, slot->seq_nr);
 596
 597         res->sr_slot = slot;
 598         res->sr_timestamp = jiffies;
 599         res->sr_status_flags = 0;
 600         /*
 601          * sr_status is only set in decode_sequence, and so will remain
 602          * set to 1 if an rpc level failure occurs.
 603          */
 604         res->sr_status = 1;
 605 out_success:
 606         rpc_call_start(task);
 607         return 0;
 608 out_sleep:
 609         /* Privileged tasks are queued with top priority */
 610         if (args->sa_privileged)
 611                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 612                                 NULL, RPC_PRIORITY_PRIVILEGED);
 613         else
 614                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 615         spin_unlock(&tbl->slot_tbl_lock);
 616         return -EAGAIN;
 617 }
 618 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 619
 620 int nfs4_setup_sequence(const struct nfs_server *server,
 621                         struct nfs4_sequence_args *args,
 622                         struct nfs4_sequence_res *res,
 623                         struct rpc_task *task)
 624 {
 625         struct nfs4_session *session = nfs4_get_session(server);
 626         int ret = 0;
 627
 628         if (session == NULL) {
 629                 rpc_call_start(task);
 630                 goto out;
 631         }
 632
 633         dprintk("--> %s clp %p session %p sr_slot %d\n",
 634                 __func__, session->clp, session, res->sr_slot ?
 635                         res->sr_slot->slot_nr : -1);
 636
 637         ret = nfs41_setup_sequence(session, args, res, task);
 638 out:
 639         dprintk("<-- %s status=%d\n", __func__, ret);
 640         return ret;
 641 }
 642
 643 struct nfs41_call_sync_data {
 644         const struct nfs_server *seq_server;
 645         struct nfs4_sequence_args *seq_args;
 646         struct nfs4_sequence_res *seq_res;
 647 };
 648
 649 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 650 {
 651         struct nfs41_call_sync_data *data = calldata;
 652         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 653
 654         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 655
 656         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 657 }
 658
 659 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 660 {
 661         struct nfs41_call_sync_data *data = calldata;
 662
 663         nfs41_sequence_done(task, data->seq_res);
 664 }
 665
 666 static const struct rpc_call_ops nfs41_call_sync_ops = {
 667         .rpc_call_prepare = nfs41_call_sync_prepare,
 668         .rpc_call_done = nfs41_call_sync_done,
 669 };
 670
 671 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 672                                    struct nfs_server *server,
 673                                    struct rpc_message *msg,
 674                                    struct nfs4_sequence_args *args,
 675                                    struct nfs4_sequence_res *res)
 676 {
 677         int ret;
 678         struct rpc_task *task;
 679         struct nfs41_call_sync_data data = {
 680                 .seq_server = server,
 681                 .seq_args = args,
 682                 .seq_res = res,
 683         };
 684         struct rpc_task_setup task_setup = {
 685                 .rpc_client = clnt,
 686                 .rpc_message = msg,
 687                 .callback_ops = &nfs41_call_sync_ops,
 688                 .callback_data = &data
 689         };
 690
 691         task = rpc_run_task(&task_setup);
 692         if (IS_ERR(task))
 693                 ret = PTR_ERR(task);
 694         else {
 695                 ret = task->tk_status;
 696                 rpc_put_task(task);
 697         }
 698         return ret;
 699 }
 700
 701 #else
 702 static
 703 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 704                 struct nfs4_sequence_res *res, int cache_reply)
 705 {
 706 }
 707
 708 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 709 {
 710 }
 711
 712
 713 static int nfs4_sequence_done(struct rpc_task *task,
 714                                struct nfs4_sequence_res *res)
 715 {
 716         return 1;
 717 }
 718 #endif /* CONFIG_NFS_V4_1 */
 719
 720 static
 721 int _nfs4_call_sync(struct rpc_clnt *clnt,
 722                     struct nfs_server *server,
 723                     struct rpc_message *msg,
 724                     struct nfs4_sequence_args *args,
 725                     struct nfs4_sequence_res *res)
 726 {
 727         return rpc_call_sync(clnt, msg, 0);
 728 }
 729
 730 static
 731 int nfs4_call_sync(struct rpc_clnt *clnt,
 732                    struct nfs_server *server,
 733                    struct rpc_message *msg,
 734                    struct nfs4_sequence_args *args,
 735                    struct nfs4_sequence_res *res,
 736                    int cache_reply)
 737 {
 738         nfs41_init_sequence(args, res, cache_reply);
 739         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 740                                                 args, res);
 741 }
 742
 743 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 744 {
 745         struct nfs_inode *nfsi = NFS_I(dir);
 746
 747         spin_lock(&dir->i_lock);
 748         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 749         if (!cinfo->atomic || cinfo->before != dir->i_version)
 750                 nfs_force_lookup_revalidate(dir);
 751         dir->i_version = cinfo->after;
 752         nfs_fscache_invalidate(dir);
 753         spin_unlock(&dir->i_lock);
 754 }
 755
 756 struct nfs4_opendata {
 757         struct kref kref;
 758         struct nfs_openargs o_arg;
 759         struct nfs_openres o_res;
 760         struct nfs_open_confirmargs c_arg;
 761         struct nfs_open_confirmres c_res;
 762         struct nfs4_string owner_name;
 763         struct nfs4_string group_name;
 764         struct nfs_fattr f_attr;
 765         struct dentry *dir;
 766         struct dentry *dentry;
 767         struct nfs4_state_owner *owner;
 768         struct nfs4_state *state;
 769         struct iattr attrs;
 770         unsigned long timestamp;
 771         unsigned int rpc_done : 1;
 772         int rpc_status;
 773         int cancelled;
 774 };
 775
 776 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 777                 int err, struct nfs4_exception *exception)
 778 {
 779         if (err != -EINVAL)
 780                 return false;
 781         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 782                 return false;
 783         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 784         exception->retry = 1;
 785         return true;
 786 }
 787
 788 static enum open_claim_type4
 789 nfs4_map_atomic_open_claim(struct nfs_server *server,
 790                 enum open_claim_type4 claim)
 791 {
 792         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 793                 return claim;
 794         switch (claim) {
 795         default:
 796                 return claim;
 797         case NFS4_OPEN_CLAIM_FH:
 798                 return NFS4_OPEN_CLAIM_NULL;
 799         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 800                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 801         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 802                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 803         }
 804 }
 805
 806 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 807 {
 808         p->o_res.f_attr = &p->f_attr;
 809         p->o_res.seqid = p->o_arg.seqid;
 810         p->c_res.seqid = p->c_arg.seqid;
 811         p->o_res.server = p->o_arg.server;
 812         p->o_res.access_request = p->o_arg.access;
 813         nfs_fattr_init(&p->f_attr);
 814         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 815 }
 816
 817 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 818                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 819                 const struct iattr *attrs,
 820                 enum open_claim_type4 claim,
 821                 gfp_t gfp_mask)
 822 {
 823         struct dentry *parent = dget_parent(dentry);
 824         struct inode *dir = parent->d_inode;
 825         struct nfs_server *server = NFS_SERVER(dir);
 826         struct nfs4_opendata *p;
 827
 828         p = kzalloc(sizeof(*p), gfp_mask);
 829         if (p == NULL)
 830                 goto err;
 831         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 832         if (p->o_arg.seqid == NULL)
 833                 goto err_free;
 834         nfs_sb_active(dentry->d_sb);
 835         p->dentry = dget(dentry);
 836         p->dir = parent;
 837         p->owner = sp;
 838         atomic_inc(&sp->so_count);
 839         p->o_arg.open_flags = flags;
 840         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 841         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 842          * will return permission denied for all bits until close */
 843         if (!(flags & O_EXCL)) {
 844                 /* ask server to check for all possible rights as results
 845                  * are cached */
 846                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 847                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 848         }
 849         p->o_arg.clientid = server->nfs_client->cl_clientid;
 850         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 851         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 852         p->o_arg.name = &dentry->d_name;
 853         p->o_arg.server = server;
 854         p->o_arg.bitmask = server->attr_bitmask;
 855         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 856         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
 857         switch (p->o_arg.claim) {
 858         case NFS4_OPEN_CLAIM_NULL:
 859         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 860         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 861                 p->o_arg.fh = NFS_FH(dir);
 862                 break;
 863         case NFS4_OPEN_CLAIM_PREVIOUS:
 864         case NFS4_OPEN_CLAIM_FH:
 865         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 866         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 867                 p->o_arg.fh = NFS_FH(dentry->d_inode);
 868         }
 869         if (attrs != NULL && attrs->ia_valid != 0) {
 870                 __be32 verf[2];
 871
 872                 p->o_arg.u.attrs = &p->attrs;
 873                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 874
 875                 verf[0] = jiffies;
 876                 verf[1] = current->pid;
 877                 memcpy(p->o_arg.u.verifier.data, verf,
 878                                 sizeof(p->o_arg.u.verifier.data));
 879         }
 880         p->c_arg.fh = &p->o_res.fh;
 881         p->c_arg.stateid = &p->o_res.stateid;
 882         p->c_arg.seqid = p->o_arg.seqid;
 883         nfs4_init_opendata_res(p);
 884         kref_init(&p->kref);
 885         return p;
 886 err_free:
 887         kfree(p);
 888 err:
 889         dput(parent);
 890         return NULL;
 891 }
 892
 893 static void nfs4_opendata_free(struct kref *kref)
 894 {
 895         struct nfs4_opendata *p = container_of(kref,
 896                         struct nfs4_opendata, kref);
 897         struct super_block *sb = p->dentry->d_sb;
 898
 899         nfs_free_seqid(p->o_arg.seqid);
 900         if (p->state != NULL)
 901                 nfs4_put_open_state(p->state);
 902         nfs4_put_state_owner(p->owner);
 903         dput(p->dir);
 904         dput(p->dentry);
 905         nfs_sb_deactive(sb);
 906         nfs_fattr_free_names(&p->f_attr);
 907         kfree(p);
 908 }
 909
 910 static void nfs4_opendata_put(struct nfs4_opendata *p)
 911 {
 912         if (p != NULL)
 913                 kref_put(&p->kref, nfs4_opendata_free);
 914 }
 915
 916 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 917 {
 918         int ret;
 919
 920         ret = rpc_wait_for_completion_task(task);
 921         return ret;
 922 }
 923
 924 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 925 {
 926         int ret = 0;
 927
 928         if (open_mode & (O_EXCL|O_TRUNC))
 929                 goto out;
 930         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 931                 case FMODE_READ:
 932                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 933                                 && state->n_rdonly != 0;
 934                         break;
 935                 case FMODE_WRITE:
 936                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 937                                 && state->n_wronly != 0;
 938                         break;
 939                 case FMODE_READ|FMODE_WRITE:
 940                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 941                                 && state->n_rdwr != 0;
 942         }
 943 out:
 944         return ret;
 945 }
 946
 947 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 948 {
 949         if (delegation == NULL)
 950                 return 0;
 951         if ((delegation->type & fmode) != fmode)
 952                 return 0;
 953         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 954                 return 0;
 955         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 956                 return 0;
 957         nfs_mark_delegation_referenced(delegation);
 958         return 1;
 959 }
 960
 961 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 962 {
 963         switch (fmode) {
 964                 case FMODE_WRITE:
 965                         state->n_wronly++;
 966                         break;
 967                 case FMODE_READ:
 968                         state->n_rdonly++;
 969                         break;
 970                 case FMODE_READ|FMODE_WRITE:
 971                         state->n_rdwr++;
 972         }
 973         nfs4_state_set_mode_locked(state, state->state | fmode);
 974 }
 975
 976 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 977 {
 978         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 979                 nfs4_stateid_copy(&state->stateid, stateid);
 980         nfs4_stateid_copy(&state->open_stateid, stateid);
 981         set_bit(NFS_OPEN_STATE, &state->flags);
 982         switch (fmode) {
 983                 case FMODE_READ:
 984                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 985                         break;
 986                 case FMODE_WRITE:
 987                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 988                         break;
 989                 case FMODE_READ|FMODE_WRITE:
 990                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 991         }
 992 }
 993
 994 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 995 {
 996         write_seqlock(&state->seqlock);
 997         nfs_set_open_stateid_locked(state, stateid, fmode);
 998         write_sequnlock(&state->seqlock);
 999 }
1000
1001 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1002 {
1003         /*
1004          * Protect the call to nfs4_state_set_mode_locked and
1005          * serialise the stateid update
1006          */
1007         write_seqlock(&state->seqlock);
1008         if (deleg_stateid != NULL) {
1009                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1010                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1011         }
1012         if (open_stateid != NULL)
1013                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1014         write_sequnlock(&state->seqlock);
1015         spin_lock(&state->owner->so_lock);
1016         update_open_stateflags(state, fmode);
1017         spin_unlock(&state->owner->so_lock);
1018 }
1019
1020 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1021 {
1022         struct nfs_inode *nfsi = NFS_I(state->inode);
1023         struct nfs_delegation *deleg_cur;
1024         int ret = 0;
1025
1026         fmode &= (FMODE_READ|FMODE_WRITE);
1027
1028         rcu_read_lock();
1029         deleg_cur = rcu_dereference(nfsi->delegation);
1030         if (deleg_cur == NULL)
1031                 goto no_delegation;
1032
1033         spin_lock(&deleg_cur->lock);
1034         if (nfsi->delegation != deleg_cur ||
1035            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1036             (deleg_cur->type & fmode) != fmode)
1037                 goto no_delegation_unlock;
1038
1039         if (delegation == NULL)
1040                 delegation = &deleg_cur->stateid;
1041         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1042                 goto no_delegation_unlock;
1043
1044         nfs_mark_delegation_referenced(deleg_cur);
1045         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1046         ret = 1;
1047 no_delegation_unlock:
1048         spin_unlock(&deleg_cur->lock);
1049 no_delegation:
1050         rcu_read_unlock();
1051
1052         if (!ret && open_stateid != NULL) {
1053                 __update_open_stateid(state, open_stateid, NULL, fmode);
1054                 ret = 1;
1055         }
1056
1057         return ret;
1058 }
1059
1060
1061 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1062 {
1063         struct nfs_delegation *delegation;
1064
1065         rcu_read_lock();
1066         delegation = rcu_dereference(NFS_I(inode)->delegation);
1067         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1068                 rcu_read_unlock();
1069                 return;
1070         }
1071         rcu_read_unlock();
1072         nfs4_inode_return_delegation(inode);
1073 }
1074
1075 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1076 {
1077         struct nfs4_state *state = opendata->state;
1078         struct nfs_inode *nfsi = NFS_I(state->inode);
1079         struct nfs_delegation *delegation;
1080         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1081         fmode_t fmode = opendata->o_arg.fmode;
1082         nfs4_stateid stateid;
1083         int ret = -EAGAIN;
1084
1085         for (;;) {
1086                 if (can_open_cached(state, fmode, open_mode)) {
1087                         spin_lock(&state->owner->so_lock);
1088                         if (can_open_cached(state, fmode, open_mode)) {
1089                                 update_open_stateflags(state, fmode);
1090                                 spin_unlock(&state->owner->so_lock);
1091                                 goto out_return_state;
1092                         }
1093                         spin_unlock(&state->owner->so_lock);
1094                 }
1095                 rcu_read_lock();
1096                 delegation = rcu_dereference(nfsi->delegation);
1097                 if (!can_open_delegated(delegation, fmode)) {
1098                         rcu_read_unlock();
1099                         break;
1100                 }
1101                 /* Save the delegation */
1102                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1103                 rcu_read_unlock();
1104                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1105                 if (ret != 0)
1106                         goto out;
1107                 ret = -EAGAIN;
1108
1109                 /* Try to update the stateid using the delegation */
1110                 if (update_open_stateid(state, NULL, &stateid, fmode))
1111                         goto out_return_state;
1112         }
1113 out:
1114         return ERR_PTR(ret);
1115 out_return_state:
1116         atomic_inc(&state->count);
1117         return state;
1118 }
1119
1120 static void
1121 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1122 {
1123         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1124         struct nfs_delegation *delegation;
1125         int delegation_flags = 0;
1126
1127         rcu_read_lock();
1128         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1129         if (delegation)
1130                 delegation_flags = delegation->flags;
1131         rcu_read_unlock();
1132         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1133                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1134                                    "returning a delegation for "
1135                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1136                                    clp->cl_hostname);
1137         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1138                 nfs_inode_set_delegation(state->inode,
1139                                          data->owner->so_cred,
1140                                          &data->o_res);
1141         else
1142                 nfs_inode_reclaim_delegation(state->inode,
1143                                              data->owner->so_cred,
1144                                              &data->o_res);
1145 }
1146
1147 /*
1148  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1149  * and update the nfs4_state.
1150  */
1151 static struct nfs4_state *
1152 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1153 {
1154         struct inode *inode = data->state->inode;
1155         struct nfs4_state *state = data->state;
1156         int ret;
1157
1158         if (!data->rpc_done) {
1159                 ret = data->rpc_status;
1160                 goto err;
1161         }
1162
1163         ret = -ESTALE;
1164         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1165             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1166             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1167                 goto err;
1168
1169         ret = -ENOMEM;
1170         state = nfs4_get_open_state(inode, data->owner);
1171         if (state == NULL)
1172                 goto err;
1173
1174         ret = nfs_refresh_inode(inode, &data->f_attr);
1175         if (ret)
1176                 goto err;
1177
1178         if (data->o_res.delegation_type != 0)
1179                 nfs4_opendata_check_deleg(data, state);
1180         update_open_stateid(state, &data->o_res.stateid, NULL,
1181                             data->o_arg.fmode);
1182
1183         return state;
1184 err:
1185         return ERR_PTR(ret);
1186
1187 }
1188
1189 static struct nfs4_state *
1190 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1191 {
1192         struct inode *inode;
1193         struct nfs4_state *state = NULL;
1194         int ret;
1195
1196         if (!data->rpc_done) {
1197                 state = nfs4_try_open_cached(data);
1198                 goto out;
1199         }
1200
1201         ret = -EAGAIN;
1202         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1203                 goto err;
1204         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1205         ret = PTR_ERR(inode);
1206         if (IS_ERR(inode))
1207                 goto err;
1208         ret = -ENOMEM;
1209         state = nfs4_get_open_state(inode, data->owner);
1210         if (state == NULL)
1211                 goto err_put_inode;
1212         if (data->o_res.delegation_type != 0)
1213                 nfs4_opendata_check_deleg(data, state);
1214         update_open_stateid(state, &data->o_res.stateid, NULL,
1215                         data->o_arg.fmode);
1216         iput(inode);
1217 out:
1218         nfs_release_seqid(data->o_arg.seqid);
1219         return state;
1220 err_put_inode:
1221         iput(inode);
1222 err:
1223         return ERR_PTR(ret);
1224 }
1225
1226 static struct nfs4_state *
1227 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1228 {
1229         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1230                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1231         return _nfs4_opendata_to_nfs4_state(data);
1232 }
1233
1234 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1235 {
1236         struct nfs_inode *nfsi = NFS_I(state->inode);
1237         struct nfs_open_context *ctx;
1238
1239         spin_lock(&state->inode->i_lock);
1240         list_for_each_entry(ctx, &nfsi->open_files, list) {
1241                 if (ctx->state != state)
1242                         continue;
1243                 get_nfs_open_context(ctx);
1244                 spin_unlock(&state->inode->i_lock);
1245                 return ctx;
1246         }
1247         spin_unlock(&state->inode->i_lock);
1248         return ERR_PTR(-ENOENT);
1249 }
1250
1251 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1252                 struct nfs4_state *state, enum open_claim_type4 claim)
1253 {
1254         struct nfs4_opendata *opendata;
1255
1256         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1257                         NULL, claim, GFP_NOFS);
1258         if (opendata == NULL)
1259                 return ERR_PTR(-ENOMEM);
1260         opendata->state = state;
1261         atomic_inc(&state->count);
1262         return opendata;
1263 }
1264
1265 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1266 {
1267         struct nfs4_state *newstate;
1268         int ret;
1269
1270         opendata->o_arg.open_flags = 0;
1271         opendata->o_arg.fmode = fmode;
1272         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1273         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1274         nfs4_init_opendata_res(opendata);
1275         ret = _nfs4_recover_proc_open(opendata);
1276         if (ret != 0)
1277                 return ret;
1278         newstate = nfs4_opendata_to_nfs4_state(opendata);
1279         if (IS_ERR(newstate))
1280                 return PTR_ERR(newstate);
1281         nfs4_close_state(newstate, fmode);
1282         *res = newstate;
1283         return 0;
1284 }
1285
1286 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1287 {
1288         struct nfs4_state *newstate;
1289         int ret;
1290
1291         /* memory barrier prior to reading state->n_* */
1292         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1293         clear_bit(NFS_OPEN_STATE, &state->flags);
1294         smp_rmb();
1295         if (state->n_rdwr != 0) {
1296                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1297                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1298                 if (ret != 0)
1299                         return ret;
1300                 if (newstate != state)
1301                         return -ESTALE;
1302         }
1303         if (state->n_wronly != 0) {
1304                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1305                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1306                 if (ret != 0)
1307                         return ret;
1308                 if (newstate != state)
1309                         return -ESTALE;
1310         }
1311         if (state->n_rdonly != 0) {
1312                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1313                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1314                 if (ret != 0)
1315                         return ret;
1316                 if (newstate != state)
1317                         return -ESTALE;
1318         }
1319         /*
1320          * We may have performed cached opens for all three recoveries.
1321          * Check if we need to update the current stateid.
1322          */
1323         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1324             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1325                 write_seqlock(&state->seqlock);
1326                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1327                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1328                 write_sequnlock(&state->seqlock);
1329         }
1330         return 0;
1331 }
1332
1333 /*
1334  * OPEN_RECLAIM:
1335  *      reclaim state on the server after a reboot.
1336  */
1337 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1338 {
1339         struct nfs_delegation *delegation;
1340         struct nfs4_opendata *opendata;
1341         fmode_t delegation_type = 0;
1342         int status;
1343
1344         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1345                         NFS4_OPEN_CLAIM_PREVIOUS);
1346         if (IS_ERR(opendata))
1347                 return PTR_ERR(opendata);
1348         rcu_read_lock();
1349         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1350         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1351                 delegation_type = delegation->type;
1352         rcu_read_unlock();
1353         opendata->o_arg.u.delegation_type = delegation_type;
1354         status = nfs4_open_recover(opendata, state);
1355         nfs4_opendata_put(opendata);
1356         return status;
1357 }
1358
1359 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1360 {
1361         struct nfs_server *server = NFS_SERVER(state->inode);
1362         struct nfs4_exception exception = { };
1363         int err;
1364         do {
1365                 err = _nfs4_do_open_reclaim(ctx, state);
1366                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1367                         continue;
1368                 if (err != -NFS4ERR_DELAY)
1369                         break;
1370                 nfs4_handle_exception(server, err, &exception);
1371         } while (exception.retry);
1372         return err;
1373 }
1374
1375 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1376 {
1377         struct nfs_open_context *ctx;
1378         int ret;
1379
1380         ctx = nfs4_state_find_open_context(state);
1381         if (IS_ERR(ctx))
1382                 return -EAGAIN;
1383         ret = nfs4_do_open_reclaim(ctx, state);
1384         put_nfs_open_context(ctx);
1385         return ret;
1386 }
1387
1388 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1389 {
1390         switch (err) {
1391                 default:
1392                         printk(KERN_ERR "NFS: %s: unhandled error "
1393                                         "%d.\n", __func__, err);
1394                 case 0:
1395                 case -ENOENT:
1396                 case -ESTALE:
1397                         break;
1398                 case -NFS4ERR_BADSESSION:
1399                 case -NFS4ERR_BADSLOT:
1400                 case -NFS4ERR_BAD_HIGH_SLOT:
1401                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1402                 case -NFS4ERR_DEADSESSION:
1403                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1404                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1405                         return -EAGAIN;
1406                 case -NFS4ERR_STALE_CLIENTID:
1407                 case -NFS4ERR_STALE_STATEID:
1408                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1409                 case -NFS4ERR_EXPIRED:
1410                         /* Don't recall a delegation if it was lost */
1411                         nfs4_schedule_lease_recovery(server->nfs_client);
1412                         return -EAGAIN;
1413                 case -NFS4ERR_DELEG_REVOKED:
1414                 case -NFS4ERR_ADMIN_REVOKED:
1415                 case -NFS4ERR_BAD_STATEID:
1416                 case -NFS4ERR_OPENMODE:
1417                         nfs_inode_find_state_and_recover(state->inode,
1418                                         stateid);
1419                         nfs4_schedule_stateid_recovery(server, state);
1420                         return 0;
1421                 case -NFS4ERR_DELAY:
1422                 case -NFS4ERR_GRACE:
1423                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1424                         ssleep(1);
1425                         return -EAGAIN;
1426                 case -ENOMEM:
1427                 case -NFS4ERR_DENIED:
1428                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1429                         return 0;
1430         }
1431         return err;
1432 }
1433
1434 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1435 {
1436         struct nfs_server *server = NFS_SERVER(state->inode);
1437         struct nfs4_opendata *opendata;
1438         int err;
1439
1440         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1441                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1442         if (IS_ERR(opendata))
1443                 return PTR_ERR(opendata);
1444         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1445         err = nfs4_open_recover(opendata, state);
1446         nfs4_opendata_put(opendata);
1447         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1448 }
1449
1450 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1451 {
1452         struct nfs4_opendata *data = calldata;
1453
1454         data->rpc_status = task->tk_status;
1455         if (data->rpc_status == 0) {
1456                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1457                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1458                 renew_lease(data->o_res.server, data->timestamp);
1459                 data->rpc_done = 1;
1460         }
1461 }
1462
1463 static void nfs4_open_confirm_release(void *calldata)
1464 {
1465         struct nfs4_opendata *data = calldata;
1466         struct nfs4_state *state = NULL;
1467
1468         /* If this request hasn't been cancelled, do nothing */
1469         if (data->cancelled == 0)
1470                 goto out_free;
1471         /* In case of error, no cleanup! */
1472         if (!data->rpc_done)
1473                 goto out_free;
1474         state = nfs4_opendata_to_nfs4_state(data);
1475         if (!IS_ERR(state))
1476                 nfs4_close_state(state, data->o_arg.fmode);
1477 out_free:
1478         nfs4_opendata_put(data);
1479 }
1480
1481 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1482         .rpc_call_done = nfs4_open_confirm_done,
1483         .rpc_release = nfs4_open_confirm_release,
1484 };
1485
1486 /*
1487  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1488  */
1489 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1490 {
1491         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1492         struct rpc_task *task;
1493         struct  rpc_message msg = {
1494                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1495                 .rpc_argp = &data->c_arg,
1496                 .rpc_resp = &data->c_res,
1497                 .rpc_cred = data->owner->so_cred,
1498         };
1499         struct rpc_task_setup task_setup_data = {
1500                 .rpc_client = server->client,
1501                 .rpc_message = &msg,
1502                 .callback_ops = &nfs4_open_confirm_ops,
1503                 .callback_data = data,
1504                 .workqueue = nfsiod_workqueue,
1505                 .flags = RPC_TASK_ASYNC,
1506         };
1507         int status;
1508
1509         kref_get(&data->kref);
1510         data->rpc_done = 0;
1511         data->rpc_status = 0;
1512         data->timestamp = jiffies;
1513         task = rpc_run_task(&task_setup_data);
1514         if (IS_ERR(task))
1515                 return PTR_ERR(task);
1516         status = nfs4_wait_for_completion_rpc_task(task);
1517         if (status != 0) {
1518                 data->cancelled = 1;
1519                 smp_wmb();
1520         } else
1521                 status = data->rpc_status;
1522         rpc_put_task(task);
1523         return status;
1524 }
1525
1526 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1527 {
1528         struct nfs4_opendata *data = calldata;
1529         struct nfs4_state_owner *sp = data->owner;
1530         struct nfs_client *clp = sp->so_server->nfs_client;
1531
1532         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1533                 goto out_wait;
1534         /*
1535          * Check if we still need to send an OPEN call, or if we can use
1536          * a delegation instead.
1537          */
1538         if (data->state != NULL) {
1539                 struct nfs_delegation *delegation;
1540
1541                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1542                         goto out_no_action;
1543                 rcu_read_lock();
1544                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1545                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1546                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1547                     can_open_delegated(delegation, data->o_arg.fmode))
1548                         goto unlock_no_action;
1549                 rcu_read_unlock();
1550         }
1551         /* Update client id. */
1552         data->o_arg.clientid = clp->cl_clientid;
1553         switch (data->o_arg.claim) {
1554         case NFS4_OPEN_CLAIM_PREVIOUS:
1555         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1556         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1557                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1558         case NFS4_OPEN_CLAIM_FH:
1559                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1560                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1561         }
1562         data->timestamp = jiffies;
1563         if (nfs4_setup_sequence(data->o_arg.server,
1564                                 &data->o_arg.seq_args,
1565                                 &data->o_res.seq_res,
1566                                 task) != 0)
1567                 nfs_release_seqid(data->o_arg.seqid);
1568
1569         /* Set the create mode (note dependency on the session type) */
1570         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1571         if (data->o_arg.open_flags & O_EXCL) {
1572                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1573                 if (nfs4_has_persistent_session(clp))
1574                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1575                 else if (clp->cl_mvops->minor_version > 0)
1576                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1577         }
1578         return;
1579 unlock_no_action:
1580         rcu_read_unlock();
1581 out_no_action:
1582         task->tk_action = NULL;
1583 out_wait:
1584         nfs4_sequence_done(task, &data->o_res.seq_res);
1585 }
1586
1587 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1588 {
1589         struct nfs4_opendata *data = calldata;
1590
1591         data->rpc_status = task->tk_status;
1592
1593         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1594                 return;
1595
1596         if (task->tk_status == 0) {
1597                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1598                         switch (data->o_res.f_attr->mode & S_IFMT) {
1599                         case S_IFREG:
1600                                 break;
1601                         case S_IFLNK:
1602                                 data->rpc_status = -ELOOP;
1603                                 break;
1604                         case S_IFDIR:
1605                                 data->rpc_status = -EISDIR;
1606                                 break;
1607                         default:
1608                                 data->rpc_status = -ENOTDIR;
1609                         }
1610                 }
1611                 renew_lease(data->o_res.server, data->timestamp);
1612                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1613                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1614         }
1615         data->rpc_done = 1;
1616 }
1617
1618 static void nfs4_open_release(void *calldata)
1619 {
1620         struct nfs4_opendata *data = calldata;
1621         struct nfs4_state *state = NULL;
1622
1623         /* If this request hasn't been cancelled, do nothing */
1624         if (data->cancelled == 0)
1625                 goto out_free;
1626         /* In case of error, no cleanup! */
1627         if (data->rpc_status != 0 || !data->rpc_done)
1628                 goto out_free;
1629         /* In case we need an open_confirm, no cleanup! */
1630         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1631                 goto out_free;
1632         state = nfs4_opendata_to_nfs4_state(data);
1633         if (!IS_ERR(state))
1634                 nfs4_close_state(state, data->o_arg.fmode);
1635 out_free:
1636         nfs4_opendata_put(data);
1637 }
1638
1639 static const struct rpc_call_ops nfs4_open_ops = {
1640         .rpc_call_prepare = nfs4_open_prepare,
1641         .rpc_call_done = nfs4_open_done,
1642         .rpc_release = nfs4_open_release,
1643 };
1644
1645 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1646 {
1647         struct inode *dir = data->dir->d_inode;
1648         struct nfs_server *server = NFS_SERVER(dir);
1649         struct nfs_openargs *o_arg = &data->o_arg;
1650         struct nfs_openres *o_res = &data->o_res;
1651         struct rpc_task *task;
1652         struct rpc_message msg = {
1653                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1654                 .rpc_argp = o_arg,
1655                 .rpc_resp = o_res,
1656                 .rpc_cred = data->owner->so_cred,
1657         };
1658         struct rpc_task_setup task_setup_data = {
1659                 .rpc_client = server->client,
1660                 .rpc_message = &msg,
1661                 .callback_ops = &nfs4_open_ops,
1662                 .callback_data = data,
1663                 .workqueue = nfsiod_workqueue,
1664                 .flags = RPC_TASK_ASYNC,
1665         };
1666         int status;
1667
1668         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1669         kref_get(&data->kref);
1670         data->rpc_done = 0;
1671         data->rpc_status = 0;
1672         data->cancelled = 0;
1673         if (isrecover)
1674                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1675         task = rpc_run_task(&task_setup_data);
1676         if (IS_ERR(task))
1677                 return PTR_ERR(task);
1678         status = nfs4_wait_for_completion_rpc_task(task);
1679         if (status != 0) {
1680                 data->cancelled = 1;
1681                 smp_wmb();
1682         } else
1683                 status = data->rpc_status;
1684         rpc_put_task(task);
1685
1686         return status;
1687 }
1688
1689 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1690 {
1691         struct inode *dir = data->dir->d_inode;
1692         struct nfs_openres *o_res = &data->o_res;
1693         int status;
1694
1695         status = nfs4_run_open_task(data, 1);
1696         if (status != 0 || !data->rpc_done)
1697                 return status;
1698
1699         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1700
1701         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1702                 status = _nfs4_proc_open_confirm(data);
1703                 if (status != 0)
1704                         return status;
1705         }
1706
1707         return status;
1708 }
1709
1710 static int nfs4_opendata_access(struct rpc_cred *cred,
1711                                 struct nfs4_opendata *opendata,
1712                                 struct nfs4_state *state, fmode_t fmode,
1713                                 int openflags)
1714 {
1715         struct nfs_access_entry cache;
1716         u32 mask;
1717
1718         /* access call failed or for some reason the server doesn't
1719          * support any access modes -- defer access call until later */
1720         if (opendata->o_res.access_supported == 0)
1721                 return 0;
1722
1723         mask = 0;
1724         /* don't check MAY_WRITE - a newly created file may not have
1725          * write mode bits, but POSIX allows the creating process to write.
1726          * use openflags to check for exec, because fmode won't
1727          * always have FMODE_EXEC set when file open for exec. */
1728         if (openflags & __FMODE_EXEC) {
1729                 /* ONLY check for exec rights */
1730                 mask = MAY_EXEC;
1731         } else if (fmode & FMODE_READ)
1732                 mask = MAY_READ;
1733
1734         cache.cred = cred;
1735         cache.jiffies = jiffies;
1736         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1737         nfs_access_add_cache(state->inode, &cache);
1738
1739         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1740                 return 0;
1741
1742         /* even though OPEN succeeded, access is denied. Close the file */
1743         nfs4_close_state(state, fmode);
1744         return -EACCES;
1745 }
1746
1747 /*
1748  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1749  */
1750 static int _nfs4_proc_open(struct nfs4_opendata *data)
1751 {
1752         struct inode *dir = data->dir->d_inode;
1753         struct nfs_server *server = NFS_SERVER(dir);
1754         struct nfs_openargs *o_arg = &data->o_arg;
1755         struct nfs_openres *o_res = &data->o_res;
1756         int status;
1757
1758         status = nfs4_run_open_task(data, 0);
1759         if (!data->rpc_done)
1760                 return status;
1761         if (status != 0) {
1762                 if (status == -NFS4ERR_BADNAME &&
1763                                 !(o_arg->open_flags & O_CREAT))
1764                         return -ENOENT;
1765                 return status;
1766         }
1767
1768         nfs_fattr_map_and_free_names(server, &data->f_attr);
1769
1770         if (o_arg->open_flags & O_CREAT)
1771                 update_changeattr(dir, &o_res->cinfo);
1772         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1773                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1774         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1775                 status = _nfs4_proc_open_confirm(data);
1776                 if (status != 0)
1777                         return status;
1778         }
1779         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1780                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1781         return 0;
1782 }
1783
1784 static int nfs4_recover_expired_lease(struct nfs_server *server)
1785 {
1786         return nfs4_client_recover_expired_lease(server->nfs_client);
1787 }
1788
1789 /*
1790  * OPEN_EXPIRED:
1791  *      reclaim state on the server after a network partition.
1792  *      Assumes caller holds the appropriate lock
1793  */
1794 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1795 {
1796         struct nfs4_opendata *opendata;
1797         int ret;
1798
1799         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1800                         NFS4_OPEN_CLAIM_FH);
1801         if (IS_ERR(opendata))
1802                 return PTR_ERR(opendata);
1803         ret = nfs4_open_recover(opendata, state);
1804         if (ret == -ESTALE)
1805                 d_drop(ctx->dentry);
1806         nfs4_opendata_put(opendata);
1807         return ret;
1808 }
1809
1810 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1811 {
1812         struct nfs_server *server = NFS_SERVER(state->inode);
1813         struct nfs4_exception exception = { };
1814         int err;
1815
1816         do {
1817                 err = _nfs4_open_expired(ctx, state);
1818                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1819                         continue;
1820                 switch (err) {
1821                 default:
1822                         goto out;
1823                 case -NFS4ERR_GRACE:
1824                 case -NFS4ERR_DELAY:
1825                         nfs4_handle_exception(server, err, &exception);
1826                         err = 0;
1827                 }
1828         } while (exception.retry);
1829 out:
1830         return err;
1831 }
1832
1833 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1834 {
1835         struct nfs_open_context *ctx;
1836         int ret;
1837
1838         ctx = nfs4_state_find_open_context(state);
1839         if (IS_ERR(ctx))
1840                 return -EAGAIN;
1841         ret = nfs4_do_open_expired(ctx, state);
1842         put_nfs_open_context(ctx);
1843         return ret;
1844 }
1845
1846 #if defined(CONFIG_NFS_V4_1)
1847 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1848 {
1849         struct nfs_server *server = NFS_SERVER(state->inode);
1850         nfs4_stateid *stateid = &state->stateid;
1851         int status;
1852
1853         /* If a state reset has been done, test_stateid is unneeded */
1854         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1855                 return;
1856
1857         status = nfs41_test_stateid(server, stateid);
1858         if (status != NFS_OK) {
1859                 /* Free the stateid unless the server explicitly
1860                  * informs us the stateid is unrecognized. */
1861                 if (status != -NFS4ERR_BAD_STATEID)
1862                         nfs41_free_stateid(server, stateid);
1863                 nfs_remove_bad_delegation(state->inode);
1864
1865                 write_seqlock(&state->seqlock);
1866                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1867                 write_sequnlock(&state->seqlock);
1868                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1869         }
1870 }
1871
1872 /**
1873  * nfs41_check_open_stateid - possibly free an open stateid
1874  *
1875  * @state: NFSv4 state for an inode
1876  *
1877  * Returns NFS_OK if recovery for this stateid is now finished.
1878  * Otherwise a negative NFS4ERR value is returned.
1879  */
1880 static int nfs41_check_open_stateid(struct nfs4_state *state)
1881 {
1882         struct nfs_server *server = NFS_SERVER(state->inode);
1883         nfs4_stateid *stateid = &state->open_stateid;
1884         int status;
1885
1886         /* If a state reset has been done, test_stateid is unneeded */
1887         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1888             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1889             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1890                 return -NFS4ERR_BAD_STATEID;
1891
1892         status = nfs41_test_stateid(server, stateid);
1893         if (status != NFS_OK) {
1894                 /* Free the stateid unless the server explicitly
1895                  * informs us the stateid is unrecognized. */
1896                 if (status != -NFS4ERR_BAD_STATEID)
1897                         nfs41_free_stateid(server, stateid);
1898
1899                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1900                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1901                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1902                 clear_bit(NFS_OPEN_STATE, &state->flags);
1903         }
1904         return status;
1905 }
1906
1907 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1908 {
1909         int status;
1910
1911         nfs41_clear_delegation_stateid(state);
1912         status = nfs41_check_open_stateid(state);
1913         if (status != NFS_OK)
1914                 status = nfs4_open_expired(sp, state);
1915         return status;
1916 }
1917 #endif
1918
1919 /*
1920  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1921  * fields corresponding to attributes that were used to store the verifier.
1922  * Make sure we clobber those fields in the later setattr call
1923  */
1924 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1925 {
1926         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1927             !(sattr->ia_valid & ATTR_ATIME_SET))
1928                 sattr->ia_valid |= ATTR_ATIME;
1929
1930         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1931             !(sattr->ia_valid & ATTR_MTIME_SET))
1932                 sattr->ia_valid |= ATTR_MTIME;
1933 }
1934
1935 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1936                 fmode_t fmode,
1937                 int flags,
1938                 struct nfs4_state **res)
1939 {
1940         struct nfs4_state_owner *sp = opendata->owner;
1941         struct nfs_server *server = sp->so_server;
1942         struct nfs4_state *state;
1943         unsigned int seq;
1944         int ret;
1945
1946         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1947
1948         ret = _nfs4_proc_open(opendata);
1949         if (ret != 0)
1950                 goto out;
1951
1952         state = nfs4_opendata_to_nfs4_state(opendata);
1953         ret = PTR_ERR(state);
1954         if (IS_ERR(state))
1955                 goto out;
1956         if (server->caps & NFS_CAP_POSIX_LOCK)
1957                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1958
1959         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1960         if (ret != 0)
1961                 goto out;
1962
1963         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
1964                 nfs4_schedule_stateid_recovery(server, state);
1965         *res = state;
1966 out:
1967         return ret;
1968 }
1969
1970 /*
1971  * Returns a referenced nfs4_state
1972  */
1973 static int _nfs4_do_open(struct inode *dir,
1974                         struct dentry *dentry,
1975                         fmode_t fmode,
1976                         int flags,
1977                         struct iattr *sattr,
1978                         struct rpc_cred *cred,
1979                         struct nfs4_state **res,
1980                         struct nfs4_threshold **ctx_th)
1981 {
1982         struct nfs4_state_owner  *sp;
1983         struct nfs4_state     *state = NULL;
1984         struct nfs_server       *server = NFS_SERVER(dir);
1985         struct nfs4_opendata *opendata;
1986         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
1987         int status;
1988
1989         /* Protect against reboot recovery conflicts */
1990         status = -ENOMEM;
1991         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1992         if (sp == NULL) {
1993                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1994                 goto out_err;
1995         }
1996         status = nfs4_recover_expired_lease(server);
1997         if (status != 0)
1998                 goto err_put_state_owner;
1999         if (dentry->d_inode != NULL)
2000                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2001         status = -ENOMEM;
2002         if (dentry->d_inode)
2003                 claim = NFS4_OPEN_CLAIM_FH;
2004         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2005                         claim, GFP_KERNEL);
2006         if (opendata == NULL)
2007                 goto err_put_state_owner;
2008
2009         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2010                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2011                 if (!opendata->f_attr.mdsthreshold)
2012                         goto err_opendata_put;
2013                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2014         }
2015         if (dentry->d_inode != NULL)
2016                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2017
2018         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
2019         if (status != 0)
2020                 goto err_opendata_put;
2021
2022         if ((opendata->o_arg.open_flags & O_EXCL) &&
2023             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2024                 nfs4_exclusive_attrset(opendata, sattr);
2025
2026                 nfs_fattr_init(opendata->o_res.f_attr);
2027                 status = nfs4_do_setattr(state->inode, cred,
2028                                 opendata->o_res.f_attr, sattr,
2029                                 state);
2030                 if (status == 0)
2031                         nfs_setattr_update_inode(state->inode, sattr);
2032                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2033         }
2034
2035         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2036                 *ctx_th = opendata->f_attr.mdsthreshold;
2037         else
2038                 kfree(opendata->f_attr.mdsthreshold);
2039         opendata->f_attr.mdsthreshold = NULL;
2040
2041         nfs4_opendata_put(opendata);
2042         nfs4_put_state_owner(sp);
2043         *res = state;
2044         return 0;
2045 err_opendata_put:
2046         kfree(opendata->f_attr.mdsthreshold);
2047         nfs4_opendata_put(opendata);
2048 err_put_state_owner:
2049         nfs4_put_state_owner(sp);
2050 out_err:
2051         *res = NULL;
2052         return status;
2053 }
2054
2055
2056 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2057                                         struct dentry *dentry,
2058                                         fmode_t fmode,
2059                                         int flags,
2060                                         struct iattr *sattr,
2061                                         struct rpc_cred *cred,
2062                                         struct nfs4_threshold **ctx_th)
2063 {
2064         struct nfs_server *server = NFS_SERVER(dir);
2065         struct nfs4_exception exception = { };
2066         struct nfs4_state *res;
2067         int status;
2068
2069         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2070         do {
2071                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2072                                        &res, ctx_th);
2073                 if (status == 0)
2074                         break;
2075                 /* NOTE: BAD_SEQID means the server and client disagree about the
2076                  * book-keeping w.r.t. state-changing operations
2077                  * (OPEN/CLOSE/LOCK/LOCKU...)
2078                  * It is actually a sign of a bug on the client or on the server.
2079                  *
2080                  * If we receive a BAD_SEQID error in the particular case of
2081                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2082                  * have unhashed the old state_owner for us, and that we can
2083                  * therefore safely retry using a new one. We should still warn
2084                  * the user though...
2085                  */
2086                 if (status == -NFS4ERR_BAD_SEQID) {
2087                         pr_warn_ratelimited("NFS: v4 server %s "
2088                                         " returned a bad sequence-id error!\n",
2089                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2090                         exception.retry = 1;
2091                         continue;
2092                 }
2093                 /*
2094                  * BAD_STATEID on OPEN means that the server cancelled our
2095                  * state before it received the OPEN_CONFIRM.
2096                  * Recover by retrying the request as per the discussion
2097                  * on Page 181 of RFC3530.
2098                  */
2099                 if (status == -NFS4ERR_BAD_STATEID) {
2100                         exception.retry = 1;
2101                         continue;
2102                 }
2103                 if (status == -EAGAIN) {
2104                         /* We must have found a delegation */
2105                         exception.retry = 1;
2106                         continue;
2107                 }
2108                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2109                         continue;
2110                 res = ERR_PTR(nfs4_handle_exception(server,
2111                                         status, &exception));
2112         } while (exception.retry);
2113         return res;
2114 }
2115
2116 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2117                             struct nfs_fattr *fattr, struct iattr *sattr,
2118                             struct nfs4_state *state)
2119 {
2120         struct nfs_server *server = NFS_SERVER(inode);
2121         struct nfs_setattrargs  arg = {
2122                 .fh             = NFS_FH(inode),
2123                 .iap            = sattr,
2124                 .server         = server,
2125                 .bitmask = server->attr_bitmask,
2126         };
2127         struct nfs_setattrres  res = {
2128                 .fattr          = fattr,
2129                 .server         = server,
2130         };
2131         struct rpc_message msg = {
2132                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2133                 .rpc_argp       = &arg,
2134                 .rpc_resp       = &res,
2135                 .rpc_cred       = cred,
2136         };
2137         unsigned long timestamp = jiffies;
2138         int status;
2139
2140         nfs_fattr_init(fattr);
2141
2142         if (state != NULL && nfs4_valid_open_stateid(state)) {
2143                 struct nfs_lockowner lockowner = {
2144                         .l_owner = current->files,
2145                         .l_pid = current->tgid,
2146                 };
2147                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2148                                 &lockowner);
2149         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2150                                 FMODE_WRITE)) {
2151                 /* Use that stateid */
2152         } else
2153                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2154
2155         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2156         if (status == 0 && state != NULL)
2157                 renew_lease(server, timestamp);
2158         return status;
2159 }
2160
2161 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2162                            struct nfs_fattr *fattr, struct iattr *sattr,
2163                            struct nfs4_state *state)
2164 {
2165         struct nfs_server *server = NFS_SERVER(inode);
2166         struct nfs4_exception exception = {
2167                 .state = state,
2168                 .inode = inode,
2169         };
2170         int err;
2171         do {
2172                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2173                 switch (err) {
2174                 case -NFS4ERR_OPENMODE:
2175                         if (state && !(state->state & FMODE_WRITE)) {
2176                                 err = -EBADF;
2177                                 if (sattr->ia_valid & ATTR_OPEN)
2178                                         err = -EACCES;
2179                                 goto out;
2180                         }
2181                 }
2182                 err = nfs4_handle_exception(server, err, &exception);
2183         } while (exception.retry);
2184 out:
2185         return err;
2186 }
2187
2188 struct nfs4_closedata {
2189         struct inode *inode;
2190         struct nfs4_state *state;
2191         struct nfs_closeargs arg;
2192         struct nfs_closeres res;
2193         struct nfs_fattr fattr;
2194         unsigned long timestamp;
2195         bool roc;
2196         u32 roc_barrier;
2197 };
2198
2199 static void nfs4_free_closedata(void *data)
2200 {
2201         struct nfs4_closedata *calldata = data;
2202         struct nfs4_state_owner *sp = calldata->state->owner;
2203         struct super_block *sb = calldata->state->inode->i_sb;
2204
2205         if (calldata->roc)
2206                 pnfs_roc_release(calldata->state->inode);
2207         nfs4_put_open_state(calldata->state);
2208         nfs_free_seqid(calldata->arg.seqid);
2209         nfs4_put_state_owner(sp);
2210         nfs_sb_deactive(sb);
2211         kfree(calldata);
2212 }
2213
2214 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2215                 fmode_t fmode)
2216 {
2217         spin_lock(&state->owner->so_lock);
2218         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2219         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2220         case FMODE_WRITE:
2221                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2222                 break;
2223         case FMODE_READ:
2224                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2225                 break;
2226         case 0:
2227                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2228                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2229                 clear_bit(NFS_OPEN_STATE, &state->flags);
2230         }
2231         spin_unlock(&state->owner->so_lock);
2232 }
2233
2234 static void nfs4_close_done(struct rpc_task *task, void *data)
2235 {
2236         struct nfs4_closedata *calldata = data;
2237         struct nfs4_state *state = calldata->state;
2238         struct nfs_server *server = NFS_SERVER(calldata->inode);
2239
2240         dprintk("%s: begin!\n", __func__);
2241         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2242                 return;
2243         /* hmm. we are done with the inode, and in the process of freeing
2244          * the state_owner. we keep this around to process errors
2245          */
2246         switch (task->tk_status) {
2247                 case 0:
2248                         if (calldata->roc)
2249                                 pnfs_roc_set_barrier(state->inode,
2250                                                      calldata->roc_barrier);
2251                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2252                         renew_lease(server, calldata->timestamp);
2253                         nfs4_close_clear_stateid_flags(state,
2254                                         calldata->arg.fmode);
2255                         break;
2256                 case -NFS4ERR_STALE_STATEID:
2257                 case -NFS4ERR_OLD_STATEID:
2258                 case -NFS4ERR_BAD_STATEID:
2259                 case -NFS4ERR_EXPIRED:
2260                         if (calldata->arg.fmode == 0)
2261                                 break;
2262                 default:
2263                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2264                                 rpc_restart_call_prepare(task);
2265         }
2266         nfs_release_seqid(calldata->arg.seqid);
2267         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2268         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2269 }
2270
2271 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2272 {
2273         struct nfs4_closedata *calldata = data;
2274         struct nfs4_state *state = calldata->state;
2275         struct inode *inode = calldata->inode;
2276         int call_close = 0;
2277
2278         dprintk("%s: begin!\n", __func__);
2279         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2280                 goto out_wait;
2281
2282         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2283         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2284         spin_lock(&state->owner->so_lock);
2285         /* Calculate the change in open mode */
2286         if (state->n_rdwr == 0) {
2287                 if (state->n_rdonly == 0) {
2288                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2289                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2290                         calldata->arg.fmode &= ~FMODE_READ;
2291                 }
2292                 if (state->n_wronly == 0) {
2293                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2294                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2295                         calldata->arg.fmode &= ~FMODE_WRITE;
2296                 }
2297         }
2298         if (!nfs4_valid_open_stateid(state))
2299                 call_close = 0;
2300         spin_unlock(&state->owner->so_lock);
2301
2302         if (!call_close) {
2303                 /* Note: exit _without_ calling nfs4_close_done */
2304                 goto out_no_action;
2305         }
2306
2307         if (calldata->arg.fmode == 0) {
2308                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2309                 if (calldata->roc &&
2310                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2311                         nfs_release_seqid(calldata->arg.seqid);
2312                         goto out_wait;
2313                     }
2314         }
2315
2316         nfs_fattr_init(calldata->res.fattr);
2317         calldata->timestamp = jiffies;
2318         if (nfs4_setup_sequence(NFS_SERVER(inode),
2319                                 &calldata->arg.seq_args,
2320                                 &calldata->res.seq_res,
2321                                 task) != 0)
2322                 nfs_release_seqid(calldata->arg.seqid);
2323         dprintk("%s: done!\n", __func__);
2324         return;
2325 out_no_action:
2326         task->tk_action = NULL;
2327 out_wait:
2328         nfs4_sequence_done(task, &calldata->res.seq_res);
2329 }
2330
2331 static const struct rpc_call_ops nfs4_close_ops = {
2332         .rpc_call_prepare = nfs4_close_prepare,
2333         .rpc_call_done = nfs4_close_done,
2334         .rpc_release = nfs4_free_closedata,
2335 };
2336
2337 /*
2338  * It is possible for data to be read/written from a mem-mapped file
2339  * after the sys_close call (which hits the vfs layer as a flush).
2340  * This means that we can't safely call nfsv4 close on a file until
2341  * the inode is cleared. This in turn means that we are not good
2342  * NFSv4 citizens - we do not indicate to the server to update the file's
2343  * share state even when we are done with one of the three share
2344  * stateid's in the inode.
2345  *
2346  * NOTE: Caller must be holding the sp->so_owner semaphore!
2347  */
2348 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2349 {
2350         struct nfs_server *server = NFS_SERVER(state->inode);
2351         struct nfs4_closedata *calldata;
2352         struct nfs4_state_owner *sp = state->owner;
2353         struct rpc_task *task;
2354         struct rpc_message msg = {
2355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2356                 .rpc_cred = state->owner->so_cred,
2357         };
2358         struct rpc_task_setup task_setup_data = {
2359                 .rpc_client = server->client,
2360                 .rpc_message = &msg,
2361                 .callback_ops = &nfs4_close_ops,
2362                 .workqueue = nfsiod_workqueue,
2363                 .flags = RPC_TASK_ASYNC,
2364         };
2365         int status = -ENOMEM;
2366
2367         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2368         if (calldata == NULL)
2369                 goto out;
2370         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2371         calldata->inode = state->inode;
2372         calldata->state = state;
2373         calldata->arg.fh = NFS_FH(state->inode);
2374         calldata->arg.stateid = &state->open_stateid;
2375         /* Serialization for the sequence id */
2376         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2377         if (calldata->arg.seqid == NULL)
2378                 goto out_free_calldata;
2379         calldata->arg.fmode = 0;
2380         calldata->arg.bitmask = server->cache_consistency_bitmask;
2381         calldata->res.fattr = &calldata->fattr;
2382         calldata->res.seqid = calldata->arg.seqid;
2383         calldata->res.server = server;
2384         calldata->roc = pnfs_roc(state->inode);
2385         nfs_sb_active(calldata->inode->i_sb);
2386
2387         msg.rpc_argp = &calldata->arg;
2388         msg.rpc_resp = &calldata->res;
2389         task_setup_data.callback_data = calldata;
2390         task = rpc_run_task(&task_setup_data);
2391         if (IS_ERR(task))
2392                 return PTR_ERR(task);
2393         status = 0;
2394         if (wait)
2395                 status = rpc_wait_for_completion_task(task);
2396         rpc_put_task(task);
2397         return status;
2398 out_free_calldata:
2399         kfree(calldata);
2400 out:
2401         nfs4_put_open_state(state);
2402         nfs4_put_state_owner(sp);
2403         return status;
2404 }
2405
2406 static struct inode *
2407 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2408 {
2409         struct nfs4_state *state;
2410
2411         /* Protect against concurrent sillydeletes */
2412         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2413                              ctx->cred, &ctx->mdsthreshold);
2414         if (IS_ERR(state))
2415                 return ERR_CAST(state);
2416         ctx->state = state;
2417         return igrab(state->inode);
2418 }
2419
2420 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2421 {
2422         if (ctx->state == NULL)
2423                 return;
2424         if (is_sync)
2425                 nfs4_close_sync(ctx->state, ctx->mode);
2426         else
2427                 nfs4_close_state(ctx->state, ctx->mode);
2428 }
2429
2430 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2431 {
2432         struct nfs4_server_caps_arg args = {
2433                 .fhandle = fhandle,
2434         };
2435         struct nfs4_server_caps_res res = {};
2436         struct rpc_message msg = {
2437                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2438                 .rpc_argp = &args,
2439                 .rpc_resp = &res,
2440         };
2441         int status;
2442
2443         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2444         if (status == 0) {
2445                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2446                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2447                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2448                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2449                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2450                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2451                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2452                         server->caps |= NFS_CAP_ACLS;
2453                 if (res.has_links != 0)
2454                         server->caps |= NFS_CAP_HARDLINKS;
2455                 if (res.has_symlinks != 0)
2456                         server->caps |= NFS_CAP_SYMLINKS;
2457                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2458                         server->caps |= NFS_CAP_FILEID;
2459                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2460                         server->caps |= NFS_CAP_MODE;
2461                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2462                         server->caps |= NFS_CAP_NLINK;
2463                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2464                         server->caps |= NFS_CAP_OWNER;
2465                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2466                         server->caps |= NFS_CAP_OWNER_GROUP;
2467                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2468                         server->caps |= NFS_CAP_ATIME;
2469                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2470                         server->caps |= NFS_CAP_CTIME;
2471                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2472                         server->caps |= NFS_CAP_MTIME;
2473
2474                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2475                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2476                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2477                 server->acl_bitmask = res.acl_bitmask;
2478                 server->fh_expire_type = res.fh_expire_type;
2479         }
2480
2481         return status;
2482 }
2483
2484 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2485 {
2486         struct nfs4_exception exception = { };
2487         int err;
2488         do {
2489                 err = nfs4_handle_exception(server,
2490                                 _nfs4_server_capabilities(server, fhandle),
2491                                 &exception);
2492         } while (exception.retry);
2493         return err;
2494 }
2495
2496 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2497                 struct nfs_fsinfo *info)
2498 {
2499         struct nfs4_lookup_root_arg args = {
2500                 .bitmask = nfs4_fattr_bitmap,
2501         };
2502         struct nfs4_lookup_res res = {
2503                 .server = server,
2504                 .fattr = info->fattr,
2505                 .fh = fhandle,
2506         };
2507         struct rpc_message msg = {
2508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2509                 .rpc_argp = &args,
2510                 .rpc_resp = &res,
2511         };
2512
2513         nfs_fattr_init(info->fattr);
2514         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2515 }
2516
2517 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2518                 struct nfs_fsinfo *info)
2519 {
2520         struct nfs4_exception exception = { };
2521         int err;
2522         do {
2523                 err = _nfs4_lookup_root(server, fhandle, info);
2524                 switch (err) {
2525                 case 0:
2526                 case -NFS4ERR_WRONGSEC:
2527                         goto out;
2528                 default:
2529                         err = nfs4_handle_exception(server, err, &exception);
2530                 }
2531         } while (exception.retry);
2532 out:
2533         return err;
2534 }
2535
2536 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2537                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2538 {
2539         struct rpc_auth *auth;
2540         int ret;
2541
2542         auth = rpcauth_create(flavor, server->client);
2543         if (IS_ERR(auth)) {
2544                 ret = -EIO;
2545                 goto out;
2546         }
2547         ret = nfs4_lookup_root(server, fhandle, info);
2548 out:
2549         return ret;
2550 }
2551
2552 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2553                               struct nfs_fsinfo *info)
2554 {
2555         int i, len, status = 0;
2556         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2557
2558         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2559         if (len < 0)
2560                 return len;
2561
2562         for (i = 0; i < len; i++) {
2563                 /* AUTH_UNIX is the default flavor if none was specified,
2564                  * thus has already been tried. */
2565                 if (flav_array[i] == RPC_AUTH_UNIX)
2566                         continue;
2567
2568                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2569                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2570                         continue;
2571                 break;
2572         }
2573         /*
2574          * -EACCESS could mean that the user doesn't have correct permissions
2575          * to access the mount.  It could also mean that we tried to mount
2576          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2577          * existing mount programs don't handle -EACCES very well so it should
2578          * be mapped to -EPERM instead.
2579          */
2580         if (status == -EACCES)
2581                 status = -EPERM;
2582         return status;
2583 }
2584
2585 /*
2586  * get the file handle for the "/" directory on the server
2587  */
2588 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2589                          struct nfs_fsinfo *info)
2590 {
2591         int minor_version = server->nfs_client->cl_minorversion;
2592         int status = nfs4_lookup_root(server, fhandle, info);
2593         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2594                 /*
2595                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2596                  * by nfs4_map_errors() as this function exits.
2597                  */
2598                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2599         if (status == 0)
2600                 status = nfs4_server_capabilities(server, fhandle);
2601         if (status == 0)
2602                 status = nfs4_do_fsinfo(server, fhandle, info);
2603         return nfs4_map_errors(status);
2604 }
2605
2606 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2607                               struct nfs_fsinfo *info)
2608 {
2609         int error;
2610         struct nfs_fattr *fattr = info->fattr;
2611
2612         error = nfs4_server_capabilities(server, mntfh);
2613         if (error < 0) {
2614                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2615                 return error;
2616         }
2617
2618         error = nfs4_proc_getattr(server, mntfh, fattr);
2619         if (error < 0) {
2620                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2621                 return error;
2622         }
2623
2624         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2625             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2626                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2627
2628         return error;
2629 }
2630
2631 /*
2632  * Get locations and (maybe) other attributes of a referral.
2633  * Note that we'll actually follow the referral later when
2634  * we detect fsid mismatch in inode revalidation
2635  */
2636 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2637                              const struct qstr *name, struct nfs_fattr *fattr,
2638                              struct nfs_fh *fhandle)
2639 {
2640         int status = -ENOMEM;
2641         struct page *page = NULL;
2642         struct nfs4_fs_locations *locations = NULL;
2643
2644         page = alloc_page(GFP_KERNEL);
2645         if (page == NULL)
2646                 goto out;
2647         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2648         if (locations == NULL)
2649                 goto out;
2650
2651         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2652         if (status != 0)
2653                 goto out;
2654         /* Make sure server returned a different fsid for the referral */
2655         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2656                 dprintk("%s: server did not return a different fsid for"
2657                         " a referral at %s\n", __func__, name->name);
2658                 status = -EIO;
2659                 goto out;
2660         }
2661         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2662         nfs_fixup_referral_attributes(&locations->fattr);
2663
2664         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2665         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2666         memset(fhandle, 0, sizeof(struct nfs_fh));
2667 out:
2668         if (page)
2669                 __free_page(page);
2670         kfree(locations);
2671         return status;
2672 }
2673
2674 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2675 {
2676         struct nfs4_getattr_arg args = {
2677                 .fh = fhandle,
2678                 .bitmask = server->attr_bitmask,
2679         };
2680         struct nfs4_getattr_res res = {
2681                 .fattr = fattr,
2682                 .server = server,
2683         };
2684         struct rpc_message msg = {
2685                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2686                 .rpc_argp = &args,
2687                 .rpc_resp = &res,
2688         };
2689
2690         nfs_fattr_init(fattr);
2691         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2692 }
2693
2694 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2695 {
2696         struct nfs4_exception exception = { };
2697         int err;
2698         do {
2699                 err = nfs4_handle_exception(server,
2700                                 _nfs4_proc_getattr(server, fhandle, fattr),
2701                                 &exception);
2702         } while (exception.retry);
2703         return err;
2704 }
2705
2706 /*
2707  * The file is not closed if it is opened due to the a request to change
2708  * the size of the file. The open call will not be needed once the
2709  * VFS layer lookup-intents are implemented.
2710  *
2711  * Close is called when the inode is destroyed.
2712  * If we haven't opened the file for O_WRONLY, we
2713  * need to in the size_change case to obtain a stateid.
2714  *
2715  * Got race?
2716  * Because OPEN is always done by name in nfsv4, it is
2717  * possible that we opened a different file by the same
2718  * name.  We can recognize this race condition, but we
2719  * can't do anything about it besides returning an error.
2720  *
2721  * This will be fixed with VFS changes (lookup-intent).
2722  */
2723 static int
2724 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2725                   struct iattr *sattr)
2726 {
2727         struct inode *inode = dentry->d_inode;
2728         struct rpc_cred *cred = NULL;
2729         struct nfs4_state *state = NULL;
2730         int status;
2731
2732         if (pnfs_ld_layoutret_on_setattr(inode))
2733                 pnfs_commit_and_return_layout(inode);
2734
2735         nfs_fattr_init(fattr);
2736
2737         /* Deal with open(O_TRUNC) */
2738         if (sattr->ia_valid & ATTR_OPEN)
2739                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2740
2741         /* Optimization: if the end result is no change, don't RPC */
2742         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2743                 return 0;
2744
2745         /* Search for an existing open(O_WRITE) file */
2746         if (sattr->ia_valid & ATTR_FILE) {
2747                 struct nfs_open_context *ctx;
2748
2749                 ctx = nfs_file_open_context(sattr->ia_file);
2750                 if (ctx) {
2751                         cred = ctx->cred;
2752                         state = ctx->state;
2753                 }
2754         }
2755
2756         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2757         if (status == 0)
2758                 nfs_setattr_update_inode(inode, sattr);
2759         return status;
2760 }
2761
2762 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2763                 const struct qstr *name, struct nfs_fh *fhandle,
2764                 struct nfs_fattr *fattr)
2765 {
2766         struct nfs_server *server = NFS_SERVER(dir);
2767         int                    status;
2768         struct nfs4_lookup_arg args = {
2769                 .bitmask = server->attr_bitmask,
2770                 .dir_fh = NFS_FH(dir),
2771                 .name = name,
2772         };
2773         struct nfs4_lookup_res res = {
2774                 .server = server,
2775                 .fattr = fattr,
2776                 .fh = fhandle,
2777         };
2778         struct rpc_message msg = {
2779                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2780                 .rpc_argp = &args,
2781                 .rpc_resp = &res,
2782         };
2783
2784         nfs_fattr_init(fattr);
2785
2786         dprintk("NFS call  lookup %s\n", name->name);
2787         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2788         dprintk("NFS reply lookup: %d\n", status);
2789         return status;
2790 }
2791
2792 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2793 {
2794         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2795                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2796         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2797         fattr->nlink = 2;
2798 }
2799
2800 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2801                                    struct qstr *name, struct nfs_fh *fhandle,
2802                                    struct nfs_fattr *fattr)
2803 {
2804         struct nfs4_exception exception = { };
2805         struct rpc_clnt *client = *clnt;
2806         int err;
2807         do {
2808                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2809                 switch (err) {
2810                 case -NFS4ERR_BADNAME:
2811                         err = -ENOENT;
2812                         goto out;
2813                 case -NFS4ERR_MOVED:
2814                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2815                         goto out;
2816                 case -NFS4ERR_WRONGSEC:
2817                         err = -EPERM;
2818                         if (client != *clnt)
2819                                 goto out;
2820
2821                         client = nfs4_create_sec_client(client, dir, name);
2822                         if (IS_ERR(client))
2823                                 return PTR_ERR(client);
2824
2825                         exception.retry = 1;
2826                         break;
2827                 default:
2828                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2829                 }
2830         } while (exception.retry);
2831
2832 out:
2833         if (err == 0)
2834                 *clnt = client;
2835         else if (client != *clnt)
2836                 rpc_shutdown_client(client);
2837
2838         return err;
2839 }
2840
2841 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2842                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2843 {
2844         int status;
2845         struct rpc_clnt *client = NFS_CLIENT(dir);
2846
2847         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2848         if (client != NFS_CLIENT(dir)) {
2849                 rpc_shutdown_client(client);
2850                 nfs_fixup_secinfo_attributes(fattr);
2851         }
2852         return status;
2853 }
2854
2855 struct rpc_clnt *
2856 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2857                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2858 {
2859         int status;
2860         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2861
2862         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2863         if (status < 0) {
2864                 rpc_shutdown_client(client);
2865                 return ERR_PTR(status);
2866         }
2867         return client;
2868 }
2869
2870 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2871 {
2872         struct nfs_server *server = NFS_SERVER(inode);
2873         struct nfs4_accessargs args = {
2874                 .fh = NFS_FH(inode),
2875                 .bitmask = server->cache_consistency_bitmask,
2876         };
2877         struct nfs4_accessres res = {
2878                 .server = server,
2879         };
2880         struct rpc_message msg = {
2881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2882                 .rpc_argp = &args,
2883                 .rpc_resp = &res,
2884                 .rpc_cred = entry->cred,
2885         };
2886         int mode = entry->mask;
2887         int status;
2888
2889         /*
2890          * Determine which access bits we want to ask for...
2891          */
2892         if (mode & MAY_READ)
2893                 args.access |= NFS4_ACCESS_READ;
2894         if (S_ISDIR(inode->i_mode)) {
2895                 if (mode & MAY_WRITE)
2896                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2897                 if (mode & MAY_EXEC)
2898                         args.access |= NFS4_ACCESS_LOOKUP;
2899         } else {
2900                 if (mode & MAY_WRITE)
2901                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2902                 if (mode & MAY_EXEC)
2903                         args.access |= NFS4_ACCESS_EXECUTE;
2904         }
2905
2906         res.fattr = nfs_alloc_fattr();
2907         if (res.fattr == NULL)
2908                 return -ENOMEM;
2909
2910         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2911         if (!status) {
2912                 nfs_access_set_mask(entry, res.access);
2913                 nfs_refresh_inode(inode, res.fattr);
2914         }
2915         nfs_free_fattr(res.fattr);
2916         return status;
2917 }
2918
2919 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2920 {
2921         struct nfs4_exception exception = { };
2922         int err;
2923         do {
2924                 err = nfs4_handle_exception(NFS_SERVER(inode),
2925                                 _nfs4_proc_access(inode, entry),
2926                                 &exception);
2927         } while (exception.retry);
2928         return err;
2929 }
2930
2931 /*
2932  * TODO: For the time being, we don't try to get any attributes
2933  * along with any of the zero-copy operations READ, READDIR,
2934  * READLINK, WRITE.
2935  *
2936  * In the case of the first three, we want to put the GETATTR
2937  * after the read-type operation -- this is because it is hard
2938  * to predict the length of a GETATTR response in v4, and thus
2939  * align the READ data correctly.  This means that the GETATTR
2940  * may end up partially falling into the page cache, and we should
2941  * shift it into the 'tail' of the xdr_buf before processing.
2942  * To do this efficiently, we need to know the total length
2943  * of data received, which doesn't seem to be available outside
2944  * of the RPC layer.
2945  *
2946  * In the case of WRITE, we also want to put the GETATTR after
2947  * the operation -- in this case because we want to make sure
2948  * we get the post-operation mtime and size.
2949  *
2950  * Both of these changes to the XDR layer would in fact be quite
2951  * minor, but I decided to leave them for a subsequent patch.
2952  */
2953 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2954                 unsigned int pgbase, unsigned int pglen)
2955 {
2956         struct nfs4_readlink args = {
2957                 .fh       = NFS_FH(inode),
2958                 .pgbase   = pgbase,
2959                 .pglen    = pglen,
2960                 .pages    = &page,
2961         };
2962         struct nfs4_readlink_res res;
2963         struct rpc_message msg = {
2964                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2965                 .rpc_argp = &args,
2966                 .rpc_resp = &res,
2967         };
2968
2969         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2970 }
2971
2972 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2973                 unsigned int pgbase, unsigned int pglen)
2974 {
2975         struct nfs4_exception exception = { };
2976         int err;
2977         do {
2978                 err = nfs4_handle_exception(NFS_SERVER(inode),
2979                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2980                                 &exception);
2981         } while (exception.retry);
2982         return err;
2983 }
2984
2985 /*
2986  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2987  */
2988 static int
2989 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2990                  int flags)
2991 {
2992         struct nfs_open_context *ctx;
2993         struct nfs4_state *state;
2994         int status = 0;
2995
2996         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2997         if (IS_ERR(ctx))
2998                 return PTR_ERR(ctx);
2999
3000         sattr->ia_mode &= ~current_umask();
3001         state = nfs4_do_open(dir, dentry, ctx->mode,
3002                         flags, sattr, ctx->cred,
3003                         &ctx->mdsthreshold);
3004         d_drop(dentry);
3005         if (IS_ERR(state)) {
3006                 status = PTR_ERR(state);
3007                 goto out;
3008         }
3009         d_add(dentry, igrab(state->inode));
3010         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
3011         ctx->state = state;
3012 out:
3013         put_nfs_open_context(ctx);
3014         return status;
3015 }
3016
3017 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3018 {
3019         struct nfs_server *server = NFS_SERVER(dir);
3020         struct nfs_removeargs args = {
3021                 .fh = NFS_FH(dir),
3022                 .name = *name,
3023         };
3024         struct nfs_removeres res = {
3025                 .server = server,
3026         };
3027         struct rpc_message msg = {
3028                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3029                 .rpc_argp = &args,
3030                 .rpc_resp = &res,
3031         };
3032         int status;
3033
3034         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3035         if (status == 0)
3036                 update_changeattr(dir, &res.cinfo);
3037         return status;
3038 }
3039
3040 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3041 {
3042         struct nfs4_exception exception = { };
3043         int err;
3044         do {
3045                 err = nfs4_handle_exception(NFS_SERVER(dir),
3046                                 _nfs4_proc_remove(dir, name),
3047                                 &exception);
3048         } while (exception.retry);
3049         return err;
3050 }
3051
3052 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3053 {
3054         struct nfs_server *server = NFS_SERVER(dir);
3055         struct nfs_removeargs *args = msg->rpc_argp;
3056         struct nfs_removeres *res = msg->rpc_resp;
3057
3058         res->server = server;
3059         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3060         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3061 }
3062
3063 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3064 {
3065         nfs4_setup_sequence(NFS_SERVER(data->dir),
3066                         &data->args.seq_args,
3067                         &data->res.seq_res,
3068                         task);
3069 }
3070
3071 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3072 {
3073         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3074
3075         if (!nfs4_sequence_done(task, &res->seq_res))
3076                 return 0;
3077         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3078                 return 0;
3079         update_changeattr(dir, &res->cinfo);
3080         return 1;
3081 }
3082
3083 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3084 {
3085         struct nfs_server *server = NFS_SERVER(dir);
3086         struct nfs_renameargs *arg = msg->rpc_argp;
3087         struct nfs_renameres *res = msg->rpc_resp;
3088
3089         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3090         res->server = server;
3091         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3092 }
3093
3094 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3095 {
3096         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3097                         &data->args.seq_args,
3098                         &data->res.seq_res,
3099                         task);
3100 }
3101
3102 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3103                                  struct inode *new_dir)
3104 {
3105         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3106
3107         if (!nfs4_sequence_done(task, &res->seq_res))
3108                 return 0;
3109         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3110                 return 0;
3111
3112         update_changeattr(old_dir, &res->old_cinfo);
3113         update_changeattr(new_dir, &res->new_cinfo);
3114         return 1;
3115 }
3116
3117 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3118                 struct inode *new_dir, struct qstr *new_name)
3119 {
3120         struct nfs_server *server = NFS_SERVER(old_dir);
3121         struct nfs_renameargs arg = {
3122                 .old_dir = NFS_FH(old_dir),
3123                 .new_dir = NFS_FH(new_dir),
3124                 .old_name = old_name,
3125                 .new_name = new_name,
3126         };
3127         struct nfs_renameres res = {
3128                 .server = server,
3129         };
3130         struct rpc_message msg = {
3131                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3132                 .rpc_argp = &arg,
3133                 .rpc_resp = &res,
3134         };
3135         int status = -ENOMEM;
3136
3137         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3138         if (!status) {
3139                 update_changeattr(old_dir, &res.old_cinfo);
3140                 update_changeattr(new_dir, &res.new_cinfo);
3141         }
3142         return status;
3143 }
3144
3145 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3146                 struct inode *new_dir, struct qstr *new_name)
3147 {
3148         struct nfs4_exception exception = { };
3149         int err;
3150         do {
3151                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3152                                 _nfs4_proc_rename(old_dir, old_name,
3153                                         new_dir, new_name),
3154                                 &exception);
3155         } while (exception.retry);
3156         return err;
3157 }
3158
3159 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3160 {
3161         struct nfs_server *server = NFS_SERVER(inode);
3162         struct nfs4_link_arg arg = {
3163                 .fh     = NFS_FH(inode),
3164                 .dir_fh = NFS_FH(dir),
3165                 .name   = name,
3166                 .bitmask = server->attr_bitmask,
3167         };
3168         struct nfs4_link_res res = {
3169                 .server = server,
3170         };
3171         struct rpc_message msg = {
3172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3173                 .rpc_argp = &arg,
3174                 .rpc_resp = &res,
3175         };
3176         int status = -ENOMEM;
3177
3178         res.fattr = nfs_alloc_fattr();
3179         if (res.fattr == NULL)
3180                 goto out;
3181
3182         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3183         if (!status) {
3184                 update_changeattr(dir, &res.cinfo);
3185                 nfs_post_op_update_inode(inode, res.fattr);
3186         }
3187 out:
3188         nfs_free_fattr(res.fattr);
3189         return status;
3190 }
3191
3192 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3193 {
3194         struct nfs4_exception exception = { };
3195         int err;
3196         do {
3197                 err = nfs4_handle_exception(NFS_SERVER(inode),
3198                                 _nfs4_proc_link(inode, dir, name),
3199                                 &exception);
3200         } while (exception.retry);
3201         return err;
3202 }
3203
3204 struct nfs4_createdata {
3205         struct rpc_message msg;
3206         struct nfs4_create_arg arg;
3207         struct nfs4_create_res res;
3208         struct nfs_fh fh;
3209         struct nfs_fattr fattr;
3210 };
3211
3212 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3213                 struct qstr *name, struct iattr *sattr, u32 ftype)
3214 {
3215         struct nfs4_createdata *data;
3216
3217         data = kzalloc(sizeof(*data), GFP_KERNEL);
3218         if (data != NULL) {
3219                 struct nfs_server *server = NFS_SERVER(dir);
3220
3221                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3222                 data->msg.rpc_argp = &data->arg;
3223                 data->msg.rpc_resp = &data->res;
3224                 data->arg.dir_fh = NFS_FH(dir);
3225                 data->arg.server = server;
3226                 data->arg.name = name;
3227                 data->arg.attrs = sattr;
3228                 data->arg.ftype = ftype;
3229                 data->arg.bitmask = server->attr_bitmask;
3230                 data->res.server = server;
3231                 data->res.fh = &data->fh;
3232                 data->res.fattr = &data->fattr;
3233                 nfs_fattr_init(data->res.fattr);
3234         }
3235         return data;
3236 }
3237
3238 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3239 {
3240         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3241                                     &data->arg.seq_args, &data->res.seq_res, 1);
3242         if (status == 0) {
3243                 update_changeattr(dir, &data->res.dir_cinfo);
3244                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3245         }
3246         return status;
3247 }
3248
3249 static void nfs4_free_createdata(struct nfs4_createdata *data)
3250 {
3251         kfree(data);
3252 }
3253
3254 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3255                 struct page *page, unsigned int len, struct iattr *sattr)
3256 {
3257         struct nfs4_createdata *data;
3258         int status = -ENAMETOOLONG;
3259
3260         if (len > NFS4_MAXPATHLEN)
3261                 goto out;
3262
3263         status = -ENOMEM;
3264         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3265         if (data == NULL)
3266                 goto out;
3267
3268         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3269         data->arg.u.symlink.pages = &page;
3270         data->arg.u.symlink.len = len;
3271
3272         status = nfs4_do_create(dir, dentry, data);
3273
3274         nfs4_free_createdata(data);
3275 out:
3276         return status;
3277 }
3278
3279 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3280                 struct page *page, unsigned int len, struct iattr *sattr)
3281 {
3282         struct nfs4_exception exception = { };
3283         int err;
3284         do {
3285                 err = nfs4_handle_exception(NFS_SERVER(dir),
3286                                 _nfs4_proc_symlink(dir, dentry, page,
3287                                                         len, sattr),
3288                                 &exception);
3289         } while (exception.retry);
3290         return err;
3291 }
3292
3293 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3294                 struct iattr *sattr)
3295 {
3296         struct nfs4_createdata *data;
3297         int status = -ENOMEM;
3298
3299         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3300         if (data == NULL)
3301                 goto out;
3302
3303         status = nfs4_do_create(dir, dentry, data);
3304
3305         nfs4_free_createdata(data);
3306 out:
3307         return status;
3308 }
3309
3310 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3311                 struct iattr *sattr)
3312 {
3313         struct nfs4_exception exception = { };
3314         int err;
3315
3316         sattr->ia_mode &= ~current_umask();
3317         do {
3318                 err = nfs4_handle_exception(NFS_SERVER(dir),
3319                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3320                                 &exception);
3321         } while (exception.retry);
3322         return err;
3323 }
3324
3325 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3326                 u64 cookie, struct page **pages, unsigned int count, int plus)
3327 {
3328         struct inode            *dir = dentry->d_inode;
3329         struct nfs4_readdir_arg args = {
3330                 .fh = NFS_FH(dir),
3331                 .pages = pages,
3332                 .pgbase = 0,
3333                 .count = count,
3334                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3335                 .plus = plus,
3336         };
3337         struct nfs4_readdir_res res;
3338         struct rpc_message msg = {
3339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3340                 .rpc_argp = &args,
3341                 .rpc_resp = &res,
3342                 .rpc_cred = cred,
3343         };
3344         int                     status;
3345
3346         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3347                         dentry->d_parent->d_name.name,
3348                         dentry->d_name.name,
3349                         (unsigned long long)cookie);
3350         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3351         res.pgbase = args.pgbase;
3352         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3353         if (status >= 0) {
3354                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3355                 status += args.pgbase;
3356         }
3357
3358         nfs_invalidate_atime(dir);
3359
3360         dprintk("%s: returns %d\n", __func__, status);
3361         return status;
3362 }
3363
3364 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3365                 u64 cookie, struct page **pages, unsigned int count, int plus)
3366 {
3367         struct nfs4_exception exception = { };
3368         int err;
3369         do {
3370                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3371                                 _nfs4_proc_readdir(dentry, cred, cookie,
3372                                         pages, count, plus),
3373                                 &exception);
3374         } while (exception.retry);
3375         return err;
3376 }
3377
3378 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3379                 struct iattr *sattr, dev_t rdev)
3380 {
3381         struct nfs4_createdata *data;
3382         int mode = sattr->ia_mode;
3383         int status = -ENOMEM;
3384
3385         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3386         if (data == NULL)
3387                 goto out;
3388
3389         if (S_ISFIFO(mode))
3390                 data->arg.ftype = NF4FIFO;
3391         else if (S_ISBLK(mode)) {
3392                 data->arg.ftype = NF4BLK;
3393                 data->arg.u.device.specdata1 = MAJOR(rdev);
3394                 data->arg.u.device.specdata2 = MINOR(rdev);
3395         }
3396         else if (S_ISCHR(mode)) {
3397                 data->arg.ftype = NF4CHR;
3398                 data->arg.u.device.specdata1 = MAJOR(rdev);
3399                 data->arg.u.device.specdata2 = MINOR(rdev);
3400         } else if (!S_ISSOCK(mode)) {
3401                 status = -EINVAL;
3402                 goto out_free;
3403         }
3404
3405         status = nfs4_do_create(dir, dentry, data);
3406 out_free:
3407         nfs4_free_createdata(data);
3408 out:
3409         return status;
3410 }
3411
3412 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3413                 struct iattr *sattr, dev_t rdev)
3414 {
3415         struct nfs4_exception exception = { };
3416         int err;
3417
3418         sattr->ia_mode &= ~current_umask();
3419         do {
3420                 err = nfs4_handle_exception(NFS_SERVER(dir),
3421                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3422                                 &exception);
3423         } while (exception.retry);
3424         return err;
3425 }
3426
3427 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3428                  struct nfs_fsstat *fsstat)
3429 {
3430         struct nfs4_statfs_arg args = {
3431                 .fh = fhandle,
3432                 .bitmask = server->attr_bitmask,
3433         };
3434         struct nfs4_statfs_res res = {
3435                 .fsstat = fsstat,
3436         };
3437         struct rpc_message msg = {
3438                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3439                 .rpc_argp = &args,
3440                 .rpc_resp = &res,
3441         };
3442
3443         nfs_fattr_init(fsstat->fattr);
3444         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3445 }
3446
3447 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3448 {
3449         struct nfs4_exception exception = { };
3450         int err;
3451         do {
3452                 err = nfs4_handle_exception(server,
3453                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3454                                 &exception);
3455         } while (exception.retry);
3456         return err;
3457 }
3458
3459 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3460                 struct nfs_fsinfo *fsinfo)
3461 {
3462         struct nfs4_fsinfo_arg args = {
3463                 .fh = fhandle,
3464                 .bitmask = server->attr_bitmask,
3465         };
3466         struct nfs4_fsinfo_res res = {
3467                 .fsinfo = fsinfo,
3468         };
3469         struct rpc_message msg = {
3470                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3471                 .rpc_argp = &args,
3472                 .rpc_resp = &res,
3473         };
3474
3475         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3476 }
3477
3478 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3479 {
3480         struct nfs4_exception exception = { };
3481         int err;
3482
3483         do {
3484                 err = nfs4_handle_exception(server,
3485                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3486                                 &exception);
3487         } while (exception.retry);
3488         return err;
3489 }
3490
3491 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3492 {
3493         int error;
3494
3495         nfs_fattr_init(fsinfo->fattr);
3496         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3497         if (error == 0) {
3498                 /* block layout checks this! */
3499                 server->pnfs_blksize = fsinfo->blksize;
3500                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3501         }
3502
3503         return error;
3504 }
3505
3506 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3507                 struct nfs_pathconf *pathconf)
3508 {
3509         struct nfs4_pathconf_arg args = {
3510                 .fh = fhandle,
3511                 .bitmask = server->attr_bitmask,
3512         };
3513         struct nfs4_pathconf_res res = {
3514                 .pathconf = pathconf,
3515         };
3516         struct rpc_message msg = {
3517                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3518                 .rpc_argp = &args,
3519                 .rpc_resp = &res,
3520         };
3521
3522         /* None of the pathconf attributes are mandatory to implement */
3523         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3524                 memset(pathconf, 0, sizeof(*pathconf));
3525                 return 0;
3526         }
3527
3528         nfs_fattr_init(pathconf->fattr);
3529         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3530 }
3531
3532 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3533                 struct nfs_pathconf *pathconf)
3534 {
3535         struct nfs4_exception exception = { };
3536         int err;
3537
3538         do {
3539                 err = nfs4_handle_exception(server,
3540                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3541                                 &exception);
3542         } while (exception.retry);
3543         return err;
3544 }
3545
3546 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3547                 const struct nfs_open_context *ctx,
3548                 const struct nfs_lock_context *l_ctx,
3549                 fmode_t fmode)
3550 {
3551         const struct nfs_lockowner *lockowner = NULL;
3552
3553         if (l_ctx != NULL)
3554                 lockowner = &l_ctx->lockowner;
3555         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3556 }
3557 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3558
3559 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3560                 const struct nfs_open_context *ctx,
3561                 const struct nfs_lock_context *l_ctx,
3562                 fmode_t fmode)
3563 {
3564         nfs4_stateid current_stateid;
3565
3566         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3567                 return false;
3568         return nfs4_stateid_match(stateid, &current_stateid);
3569 }
3570
3571 static bool nfs4_error_stateid_expired(int err)
3572 {
3573         switch (err) {
3574         case -NFS4ERR_DELEG_REVOKED:
3575         case -NFS4ERR_ADMIN_REVOKED:
3576         case -NFS4ERR_BAD_STATEID:
3577         case -NFS4ERR_STALE_STATEID:
3578         case -NFS4ERR_OLD_STATEID:
3579         case -NFS4ERR_OPENMODE:
3580         case -NFS4ERR_EXPIRED:
3581                 return true;
3582         }
3583         return false;
3584 }
3585
3586 void __nfs4_read_done_cb(struct nfs_read_data *data)
3587 {
3588         nfs_invalidate_atime(data->header->inode);
3589 }
3590
3591 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3592 {
3593         struct nfs_server *server = NFS_SERVER(data->header->inode);
3594
3595         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3596                 rpc_restart_call_prepare(task);
3597                 return -EAGAIN;
3598         }
3599
3600         __nfs4_read_done_cb(data);
3601         if (task->tk_status > 0)
3602                 renew_lease(server, data->timestamp);
3603         return 0;
3604 }
3605
3606 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3607                 struct nfs_readargs *args)
3608 {
3609
3610         if (!nfs4_error_stateid_expired(task->tk_status) ||
3611                 nfs4_stateid_is_current(&args->stateid,
3612                                 args->context,
3613                                 args->lock_context,
3614                                 FMODE_READ))
3615                 return false;
3616         rpc_restart_call_prepare(task);
3617         return true;
3618 }
3619
3620 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3621 {
3622
3623         dprintk("--> %s\n", __func__);
3624
3625         if (!nfs4_sequence_done(task, &data->res.seq_res))
3626                 return -EAGAIN;
3627         if (nfs4_read_stateid_changed(task, &data->args))
3628                 return -EAGAIN;
3629         return data->read_done_cb ? data->read_done_cb(task, data) :
3630                                     nfs4_read_done_cb(task, data);
3631 }
3632
3633 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3634 {
3635         data->timestamp   = jiffies;
3636         data->read_done_cb = nfs4_read_done_cb;
3637         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3638         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3639 }
3640
3641 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3642 {
3643         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3644                         &data->args.seq_args,
3645                         &data->res.seq_res,
3646                         task))
3647                 return;
3648         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3649                         data->args.lock_context, FMODE_READ);
3650 }
3651
3652 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3653 {
3654         struct inode *inode = data->header->inode;
3655
3656         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3657                 rpc_restart_call_prepare(task);
3658                 return -EAGAIN;
3659         }
3660         if (task->tk_status >= 0) {
3661                 renew_lease(NFS_SERVER(inode), data->timestamp);
3662                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3663         }
3664         return 0;
3665 }
3666
3667 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3668                 struct nfs_writeargs *args)
3669 {
3670
3671         if (!nfs4_error_stateid_expired(task->tk_status) ||
3672                 nfs4_stateid_is_current(&args->stateid,
3673                                 args->context,
3674                                 args->lock_context,
3675                                 FMODE_WRITE))
3676                 return false;
3677         rpc_restart_call_prepare(task);
3678         return true;
3679 }
3680
3681 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3682 {
3683         if (!nfs4_sequence_done(task, &data->res.seq_res))
3684                 return -EAGAIN;
3685         if (nfs4_write_stateid_changed(task, &data->args))
3686                 return -EAGAIN;
3687         return data->write_done_cb ? data->write_done_cb(task, data) :
3688                 nfs4_write_done_cb(task, data);
3689 }
3690
3691 static
3692 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3693 {
3694         const struct nfs_pgio_header *hdr = data->header;
3695
3696         /* Don't request attributes for pNFS or O_DIRECT writes */
3697         if (data->ds_clp != NULL || hdr->dreq != NULL)
3698                 return false;
3699         /* Otherwise, request attributes if and only if we don't hold
3700          * a delegation
3701          */
3702         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3703 }
3704
3705 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3706 {
3707         struct nfs_server *server = NFS_SERVER(data->header->inode);
3708
3709         if (!nfs4_write_need_cache_consistency_data(data)) {
3710                 data->args.bitmask = NULL;
3711                 data->res.fattr = NULL;
3712         } else
3713                 data->args.bitmask = server->cache_consistency_bitmask;
3714
3715         if (!data->write_done_cb)
3716                 data->write_done_cb = nfs4_write_done_cb;
3717         data->res.server = server;
3718         data->timestamp   = jiffies;
3719
3720         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3721         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3722 }
3723
3724 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3725 {
3726         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3727                         &data->args.seq_args,
3728                         &data->res.seq_res,
3729                         task))
3730                 return;
3731         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3732                         data->args.lock_context, FMODE_WRITE);
3733 }
3734
3735 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3736 {
3737         nfs4_setup_sequence(NFS_SERVER(data->inode),
3738                         &data->args.seq_args,
3739                         &data->res.seq_res,
3740                         task);
3741 }
3742
3743 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3744 {
3745         struct inode *inode = data->inode;
3746
3747         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3748                 rpc_restart_call_prepare(task);
3749                 return -EAGAIN;
3750         }
3751         return 0;
3752 }
3753
3754 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3755 {
3756         if (!nfs4_sequence_done(task, &data->res.seq_res))
3757                 return -EAGAIN;
3758         return data->commit_done_cb(task, data);
3759 }
3760
3761 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3762 {
3763         struct nfs_server *server = NFS_SERVER(data->inode);
3764
3765         if (data->commit_done_cb == NULL)
3766                 data->commit_done_cb = nfs4_commit_done_cb;
3767         data->res.server = server;
3768         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3769         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3770 }
3771
3772 struct nfs4_renewdata {
3773         struct nfs_client       *client;
3774         unsigned long           timestamp;
3775 };
3776
3777 /*
3778  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3779  * standalone procedure for queueing an asynchronous RENEW.
3780  */
3781 static void nfs4_renew_release(void *calldata)
3782 {
3783         struct nfs4_renewdata *data = calldata;
3784         struct nfs_client *clp = data->client;
3785
3786         if (atomic_read(&clp->cl_count) > 1)
3787                 nfs4_schedule_state_renewal(clp);
3788         nfs_put_client(clp);
3789         kfree(data);
3790 }
3791
3792 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3793 {
3794         struct nfs4_renewdata *data = calldata;
3795         struct nfs_client *clp = data->client;
3796         unsigned long timestamp = data->timestamp;
3797
3798         if (task->tk_status < 0) {
3799                 /* Unless we're shutting down, schedule state recovery! */
3800                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3801                         return;
3802                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3803                         nfs4_schedule_lease_recovery(clp);
3804                         return;
3805                 }
3806                 nfs4_schedule_path_down_recovery(clp);
3807         }
3808         do_renew_lease(clp, timestamp);
3809 }
3810
3811 static const struct rpc_call_ops nfs4_renew_ops = {
3812         .rpc_call_done = nfs4_renew_done,
3813         .rpc_release = nfs4_renew_release,
3814 };
3815
3816 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3817 {
3818         struct rpc_message msg = {
3819                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3820                 .rpc_argp       = clp,
3821                 .rpc_cred       = cred,
3822         };
3823         struct nfs4_renewdata *data;
3824
3825         if (renew_flags == 0)
3826                 return 0;
3827         if (!atomic_inc_not_zero(&clp->cl_count))
3828                 return -EIO;
3829         data = kmalloc(sizeof(*data), GFP_NOFS);
3830         if (data == NULL)
3831                 return -ENOMEM;
3832         data->client = clp;
3833         data->timestamp = jiffies;
3834         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
3835                         &nfs4_renew_ops, data);
3836 }
3837
3838 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3839 {
3840         struct rpc_message msg = {
3841                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3842                 .rpc_argp       = clp,
3843                 .rpc_cred       = cred,
3844         };
3845         unsigned long now = jiffies;
3846         int status;
3847
3848         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3849         if (status < 0)
3850                 return status;
3851         do_renew_lease(clp, now);
3852         return 0;
3853 }
3854
3855 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3856 {
3857         return (server->caps & NFS_CAP_ACLS)
3858                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3859                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3860 }
3861
3862 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3863  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3864  * the stack.
3865  */
3866 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3867
3868 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3869                 struct page **pages, unsigned int *pgbase)
3870 {
3871         struct page *newpage, **spages;
3872         int rc = 0;
3873         size_t len;
3874         spages = pages;
3875
3876         do {
3877                 len = min_t(size_t, PAGE_SIZE, buflen);
3878                 newpage = alloc_page(GFP_KERNEL);
3879
3880                 if (newpage == NULL)
3881                         goto unwind;
3882                 memcpy(page_address(newpage), buf, len);
3883                 buf += len;
3884                 buflen -= len;
3885                 *pages++ = newpage;
3886                 rc++;
3887         } while (buflen != 0);
3888
3889         return rc;
3890
3891 unwind:
3892         for(; rc > 0; rc--)
3893                 __free_page(spages[rc-1]);
3894         return -ENOMEM;
3895 }
3896
3897 struct nfs4_cached_acl {
3898         int cached;
3899         size_t len;
3900         char data[0];
3901 };
3902
3903 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3904 {
3905         struct nfs_inode *nfsi = NFS_I(inode);
3906
3907         spin_lock(&inode->i_lock);
3908         kfree(nfsi->nfs4_acl);
3909         nfsi->nfs4_acl = acl;
3910         spin_unlock(&inode->i_lock);
3911 }
3912
3913 static void nfs4_zap_acl_attr(struct inode *inode)
3914 {
3915         nfs4_set_cached_acl(inode, NULL);
3916 }
3917
3918 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3919 {
3920         struct nfs_inode *nfsi = NFS_I(inode);
3921         struct nfs4_cached_acl *acl;
3922         int ret = -ENOENT;
3923
3924         spin_lock(&inode->i_lock);
3925         acl = nfsi->nfs4_acl;
3926         if (acl == NULL)
3927                 goto out;
3928         if (buf == NULL) /* user is just asking for length */
3929                 goto out_len;
3930         if (acl->cached == 0)
3931                 goto out;
3932         ret = -ERANGE; /* see getxattr(2) man page */
3933         if (acl->len > buflen)
3934                 goto out;
3935         memcpy(buf, acl->data, acl->len);
3936 out_len:
3937         ret = acl->len;
3938 out:
3939         spin_unlock(&inode->i_lock);
3940         return ret;
3941 }
3942
3943 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3944 {
3945         struct nfs4_cached_acl *acl;
3946         size_t buflen = sizeof(*acl) + acl_len;
3947
3948         if (buflen <= PAGE_SIZE) {
3949                 acl = kmalloc(buflen, GFP_KERNEL);
3950                 if (acl == NULL)
3951                         goto out;
3952                 acl->cached = 1;
3953                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3954         } else {
3955                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3956                 if (acl == NULL)
3957                         goto out;
3958                 acl->cached = 0;
3959         }
3960         acl->len = acl_len;
3961 out:
3962         nfs4_set_cached_acl(inode, acl);
3963 }
3964
3965 /*
3966  * The getxattr API returns the required buffer length when called with a
3967  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3968  * the required buf.  On a NULL buf, we send a page of data to the server
3969  * guessing that the ACL request can be serviced by a page. If so, we cache
3970  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3971  * the cache. If not so, we throw away the page, and cache the required
3972  * length. The next getxattr call will then produce another round trip to
3973  * the server, this time with the input buf of the required size.
3974  */
3975 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3976 {
3977         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3978         struct nfs_getaclargs args = {
3979                 .fh = NFS_FH(inode),
3980                 .acl_pages = pages,
3981                 .acl_len = buflen,
3982         };
3983         struct nfs_getaclres res = {
3984                 .acl_len = buflen,
3985         };
3986         struct rpc_message msg = {
3987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3988                 .rpc_argp = &args,
3989                 .rpc_resp = &res,
3990         };
3991         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3992         int ret = -ENOMEM, i;
3993
3994         /* As long as we're doing a round trip to the server anyway,
3995          * let's be prepared for a page of acl data. */
3996         if (npages == 0)
3997                 npages = 1;
3998         if (npages > ARRAY_SIZE(pages))
3999                 return -ERANGE;
4000
4001         for (i = 0; i < npages; i++) {
4002                 pages[i] = alloc_page(GFP_KERNEL);
4003                 if (!pages[i])
4004                         goto out_free;
4005         }
4006
4007         /* for decoding across pages */
4008         res.acl_scratch = alloc_page(GFP_KERNEL);
4009         if (!res.acl_scratch)
4010                 goto out_free;
4011
4012         args.acl_len = npages * PAGE_SIZE;
4013         args.acl_pgbase = 0;
4014
4015         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4016                 __func__, buf, buflen, npages, args.acl_len);
4017         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4018                              &msg, &args.seq_args, &res.seq_res, 0);
4019         if (ret)
4020                 goto out_free;
4021
4022         /* Handle the case where the passed-in buffer is too short */
4023         if (res.acl_flags & NFS4_ACL_TRUNC) {
4024                 /* Did the user only issue a request for the acl length? */
4025                 if (buf == NULL)
4026                         goto out_ok;
4027                 ret = -ERANGE;
4028                 goto out_free;
4029         }
4030         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4031         if (buf) {
4032                 if (res.acl_len > buflen) {
4033                         ret = -ERANGE;
4034                         goto out_free;
4035                 }
4036                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4037         }
4038 out_ok:
4039         ret = res.acl_len;
4040 out_free:
4041         for (i = 0; i < npages; i++)
4042                 if (pages[i])
4043                         __free_page(pages[i]);
4044         if (res.acl_scratch)
4045                 __free_page(res.acl_scratch);
4046         return ret;
4047 }
4048
4049 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4050 {
4051         struct nfs4_exception exception = { };
4052         ssize_t ret;
4053         do {
4054                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4055                 if (ret >= 0)
4056                         break;
4057                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4058         } while (exception.retry);
4059         return ret;
4060 }
4061
4062 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4063 {
4064         struct nfs_server *server = NFS_SERVER(inode);
4065         int ret;
4066
4067         if (!nfs4_server_supports_acls(server))
4068                 return -EOPNOTSUPP;
4069         ret = nfs_revalidate_inode(server, inode);
4070         if (ret < 0)
4071                 return ret;
4072         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4073                 nfs_zap_acl_cache(inode);
4074         ret = nfs4_read_cached_acl(inode, buf, buflen);
4075         if (ret != -ENOENT)
4076                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4077                  * but no cached acl data, just the acl length */
4078                 return ret;
4079         return nfs4_get_acl_uncached(inode, buf, buflen);
4080 }
4081
4082 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4083 {
4084         struct nfs_server *server = NFS_SERVER(inode);
4085         struct page *pages[NFS4ACL_MAXPAGES];
4086         struct nfs_setaclargs arg = {
4087                 .fh             = NFS_FH(inode),
4088                 .acl_pages      = pages,
4089                 .acl_len        = buflen,
4090         };
4091         struct nfs_setaclres res;
4092         struct rpc_message msg = {
4093                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4094                 .rpc_argp       = &arg,
4095                 .rpc_resp       = &res,
4096         };
4097         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4098         int ret, i;
4099
4100         if (!nfs4_server_supports_acls(server))
4101                 return -EOPNOTSUPP;
4102         if (npages > ARRAY_SIZE(pages))
4103                 return -ERANGE;
4104         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4105         if (i < 0)
4106                 return i;
4107         nfs4_inode_return_delegation(inode);
4108         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4109
4110         /*
4111          * Free each page after tx, so the only ref left is
4112          * held by the network stack
4113          */
4114         for (; i > 0; i--)
4115                 put_page(pages[i-1]);
4116
4117         /*
4118          * Acl update can result in inode attribute update.
4119          * so mark the attribute cache invalid.
4120          */
4121         spin_lock(&inode->i_lock);
4122         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4123         spin_unlock(&inode->i_lock);
4124         nfs_access_zap_cache(inode);
4125         nfs_zap_acl_cache(inode);
4126         return ret;
4127 }
4128
4129 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4130 {
4131         struct nfs4_exception exception = { };
4132         int err;
4133         do {
4134                 err = nfs4_handle_exception(NFS_SERVER(inode),
4135                                 __nfs4_proc_set_acl(inode, buf, buflen),
4136                                 &exception);
4137         } while (exception.retry);
4138         return err;
4139 }
4140
4141 static int
4142 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4143 {
4144         struct nfs_client *clp = server->nfs_client;
4145
4146         if (task->tk_status >= 0)
4147                 return 0;
4148         switch(task->tk_status) {
4149                 case -NFS4ERR_DELEG_REVOKED:
4150                 case -NFS4ERR_ADMIN_REVOKED:
4151                 case -NFS4ERR_BAD_STATEID:
4152                         if (state == NULL)
4153                                 break;
4154                         nfs_remove_bad_delegation(state->inode);
4155                 case -NFS4ERR_OPENMODE:
4156                         if (state == NULL)
4157                                 break;
4158                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4159                                 goto stateid_invalid;
4160                         goto wait_on_recovery;
4161                 case -NFS4ERR_EXPIRED:
4162                         if (state != NULL) {
4163                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4164                                         goto stateid_invalid;
4165                         }
4166                 case -NFS4ERR_STALE_STATEID:
4167                 case -NFS4ERR_STALE_CLIENTID:
4168                         nfs4_schedule_lease_recovery(clp);
4169                         goto wait_on_recovery;
4170 #if defined(CONFIG_NFS_V4_1)
4171                 case -NFS4ERR_BADSESSION:
4172                 case -NFS4ERR_BADSLOT:
4173                 case -NFS4ERR_BAD_HIGH_SLOT:
4174                 case -NFS4ERR_DEADSESSION:
4175                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4176                 case -NFS4ERR_SEQ_FALSE_RETRY:
4177                 case -NFS4ERR_SEQ_MISORDERED:
4178                         dprintk("%s ERROR %d, Reset session\n", __func__,
4179                                 task->tk_status);
4180                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4181                         task->tk_status = 0;
4182                         return -EAGAIN;
4183 #endif /* CONFIG_NFS_V4_1 */
4184                 case -NFS4ERR_DELAY:
4185                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4186                 case -NFS4ERR_GRACE:
4187                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4188                         task->tk_status = 0;
4189                         return -EAGAIN;
4190                 case -NFS4ERR_RETRY_UNCACHED_REP:
4191                 case -NFS4ERR_OLD_STATEID:
4192                         task->tk_status = 0;
4193                         return -EAGAIN;
4194         }
4195         task->tk_status = nfs4_map_errors(task->tk_status);
4196         return 0;
4197 stateid_invalid:
4198         task->tk_status = -EIO;
4199         return 0;
4200 wait_on_recovery:
4201         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4202         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4203                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4204         task->tk_status = 0;
4205         return -EAGAIN;
4206 }
4207
4208 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4209                                     nfs4_verifier *bootverf)
4210 {
4211         __be32 verf[2];
4212
4213         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4214                 /* An impossible timestamp guarantees this value
4215                  * will never match a generated boot time. */
4216                 verf[0] = 0;
4217                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4218         } else {
4219                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4220                 verf[0] = (__be32)nn->boot_time.tv_sec;
4221                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4222         }
4223         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4224 }
4225
4226 static unsigned int
4227 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4228                                    char *buf, size_t len)
4229 {
4230         unsigned int result;
4231
4232         rcu_read_lock();
4233         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4234                                 clp->cl_ipaddr,
4235                                 rpc_peeraddr2str(clp->cl_rpcclient,
4236                                                         RPC_DISPLAY_ADDR),
4237                                 rpc_peeraddr2str(clp->cl_rpcclient,
4238                                                         RPC_DISPLAY_PROTO));
4239         rcu_read_unlock();
4240         return result;
4241 }
4242
4243 static unsigned int
4244 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4245                                 char *buf, size_t len)
4246 {
4247         char *nodename = clp->cl_rpcclient->cl_nodename;
4248
4249         if (nfs4_client_id_uniquifier[0] != '\0')
4250                 nodename = nfs4_client_id_uniquifier;
4251         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4252                                 clp->rpc_ops->version, clp->cl_minorversion,
4253                                 nodename);
4254 }
4255
4256 /**
4257  * nfs4_proc_setclientid - Negotiate client ID
4258  * @clp: state data structure
4259  * @program: RPC program for NFSv4 callback service
4260  * @port: IP port number for NFS4 callback service
4261  * @cred: RPC credential to use for this call
4262  * @res: where to place the result
4263  *
4264  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4265  */
4266 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4267                 unsigned short port, struct rpc_cred *cred,
4268                 struct nfs4_setclientid_res *res)
4269 {
4270         nfs4_verifier sc_verifier;
4271         struct nfs4_setclientid setclientid = {
4272                 .sc_verifier = &sc_verifier,
4273                 .sc_prog = program,
4274                 .sc_cb_ident = clp->cl_cb_ident,
4275         };
4276         struct rpc_message msg = {
4277                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4278                 .rpc_argp = &setclientid,
4279                 .rpc_resp = res,
4280                 .rpc_cred = cred,
4281         };
4282         int status;
4283
4284         /* nfs_client_id4 */
4285         nfs4_init_boot_verifier(clp, &sc_verifier);
4286         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4287                 setclientid.sc_name_len =
4288                                 nfs4_init_uniform_client_string(clp,
4289                                                 setclientid.sc_name,
4290                                                 sizeof(setclientid.sc_name));
4291         else
4292                 setclientid.sc_name_len =
4293                                 nfs4_init_nonuniform_client_string(clp,
4294                                                 setclientid.sc_name,
4295                                                 sizeof(setclientid.sc_name));
4296         /* cb_client4 */
4297         rcu_read_lock();
4298         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4299                                 sizeof(setclientid.sc_netid),
4300                                 rpc_peeraddr2str(clp->cl_rpcclient,
4301                                                         RPC_DISPLAY_NETID));
4302         rcu_read_unlock();
4303         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4304                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4305                                 clp->cl_ipaddr, port >> 8, port & 255);
4306
4307         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4308                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4309                 setclientid.sc_name_len, setclientid.sc_name);
4310         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4311         dprintk("NFS reply setclientid: %d\n", status);
4312         return status;
4313 }
4314
4315 /**
4316  * nfs4_proc_setclientid_confirm - Confirm client ID
4317  * @clp: state data structure
4318  * @res: result of a previous SETCLIENTID
4319  * @cred: RPC credential to use for this call
4320  *
4321  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4322  */
4323 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4324                 struct nfs4_setclientid_res *arg,
4325                 struct rpc_cred *cred)
4326 {
4327         struct nfs_fsinfo fsinfo;
4328         struct rpc_message msg = {
4329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4330                 .rpc_argp = arg,
4331                 .rpc_resp = &fsinfo,
4332                 .rpc_cred = cred,
4333         };
4334         unsigned long now;
4335         int status;
4336
4337         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4338                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4339                 clp->cl_clientid);
4340         now = jiffies;
4341         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4342         if (status == 0) {
4343                 spin_lock(&clp->cl_lock);
4344                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4345                 clp->cl_last_renewal = now;
4346                 spin_unlock(&clp->cl_lock);
4347         }
4348         dprintk("NFS reply setclientid_confirm: %d\n", status);
4349         return status;
4350 }
4351
4352 struct nfs4_delegreturndata {
4353         struct nfs4_delegreturnargs args;
4354         struct nfs4_delegreturnres res;
4355         struct nfs_fh fh;
4356         nfs4_stateid stateid;
4357         unsigned long timestamp;
4358         struct nfs_fattr fattr;
4359         int rpc_status;
4360 };
4361
4362 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4363 {
4364         struct nfs4_delegreturndata *data = calldata;
4365
4366         if (!nfs4_sequence_done(task, &data->res.seq_res))
4367                 return;
4368
4369         switch (task->tk_status) {
4370         case -NFS4ERR_STALE_STATEID:
4371         case -NFS4ERR_EXPIRED:
4372         case 0:
4373                 renew_lease(data->res.server, data->timestamp);
4374                 break;
4375         default:
4376                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4377                                 -EAGAIN) {
4378                         rpc_restart_call_prepare(task);
4379                         return;
4380                 }
4381         }
4382         data->rpc_status = task->tk_status;
4383 }
4384
4385 static void nfs4_delegreturn_release(void *calldata)
4386 {
4387         kfree(calldata);
4388 }
4389
4390 #if defined(CONFIG_NFS_V4_1)
4391 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4392 {
4393         struct nfs4_delegreturndata *d_data;
4394
4395         d_data = (struct nfs4_delegreturndata *)data;
4396
4397         nfs4_setup_sequence(d_data->res.server,
4398                         &d_data->args.seq_args,
4399                         &d_data->res.seq_res,
4400                         task);
4401 }
4402 #endif /* CONFIG_NFS_V4_1 */
4403
4404 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4405 #if defined(CONFIG_NFS_V4_1)
4406         .rpc_call_prepare = nfs4_delegreturn_prepare,
4407 #endif /* CONFIG_NFS_V4_1 */
4408         .rpc_call_done = nfs4_delegreturn_done,
4409         .rpc_release = nfs4_delegreturn_release,
4410 };
4411
4412 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4413 {
4414         struct nfs4_delegreturndata *data;
4415         struct nfs_server *server = NFS_SERVER(inode);
4416         struct rpc_task *task;
4417         struct rpc_message msg = {
4418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4419                 .rpc_cred = cred,
4420         };
4421         struct rpc_task_setup task_setup_data = {
4422                 .rpc_client = server->client,
4423                 .rpc_message = &msg,
4424                 .callback_ops = &nfs4_delegreturn_ops,
4425                 .flags = RPC_TASK_ASYNC,
4426         };
4427         int status = 0;
4428
4429         data = kzalloc(sizeof(*data), GFP_NOFS);
4430         if (data == NULL)
4431                 return -ENOMEM;
4432         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4433         data->args.fhandle = &data->fh;
4434         data->args.stateid = &data->stateid;
4435         data->args.bitmask = server->cache_consistency_bitmask;
4436         nfs_copy_fh(&data->fh, NFS_FH(inode));
4437         nfs4_stateid_copy(&data->stateid, stateid);
4438         data->res.fattr = &data->fattr;
4439         data->res.server = server;
4440         nfs_fattr_init(data->res.fattr);
4441         data->timestamp = jiffies;
4442         data->rpc_status = 0;
4443
4444         task_setup_data.callback_data = data;
4445         msg.rpc_argp = &data->args;
4446         msg.rpc_resp = &data->res;
4447         task = rpc_run_task(&task_setup_data);
4448         if (IS_ERR(task))
4449                 return PTR_ERR(task);
4450         if (!issync)
4451                 goto out;
4452         status = nfs4_wait_for_completion_rpc_task(task);
4453         if (status != 0)
4454                 goto out;
4455         status = data->rpc_status;
4456         if (status == 0)
4457                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4458         else
4459                 nfs_refresh_inode(inode, &data->fattr);
4460 out:
4461         rpc_put_task(task);
4462         return status;
4463 }
4464
4465 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4466 {
4467         struct nfs_server *server = NFS_SERVER(inode);
4468         struct nfs4_exception exception = { };
4469         int err;
4470         do {
4471                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4472                 switch (err) {
4473                         case -NFS4ERR_STALE_STATEID:
4474                         case -NFS4ERR_EXPIRED:
4475                         case 0:
4476                                 return 0;
4477                 }
4478                 err = nfs4_handle_exception(server, err, &exception);
4479         } while (exception.retry);
4480         return err;
4481 }
4482
4483 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4484 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4485
4486 /*
4487  * sleep, with exponential backoff, and retry the LOCK operation.
4488  */
4489 static unsigned long
4490 nfs4_set_lock_task_retry(unsigned long timeout)
4491 {
4492         freezable_schedule_timeout_killable(timeout);
4493         timeout <<= 1;
4494         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4495                 return NFS4_LOCK_MAXTIMEOUT;
4496         return timeout;
4497 }
4498
4499 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4500 {
4501         struct inode *inode = state->inode;
4502         struct nfs_server *server = NFS_SERVER(inode);
4503         struct nfs_client *clp = server->nfs_client;
4504         struct nfs_lockt_args arg = {
4505                 .fh = NFS_FH(inode),
4506                 .fl = request,
4507         };
4508         struct nfs_lockt_res res = {
4509                 .denied = request,
4510         };
4511         struct rpc_message msg = {
4512                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4513                 .rpc_argp       = &arg,
4514                 .rpc_resp       = &res,
4515                 .rpc_cred       = state->owner->so_cred,
4516         };
4517         struct nfs4_lock_state *lsp;
4518         int status;
4519
4520         arg.lock_owner.clientid = clp->cl_clientid;
4521         status = nfs4_set_lock_state(state, request);
4522         if (status != 0)
4523                 goto out;
4524         lsp = request->fl_u.nfs4_fl.owner;
4525         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4526         arg.lock_owner.s_dev = server->s_dev;
4527         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4528         switch (status) {
4529                 case 0:
4530                         request->fl_type = F_UNLCK;
4531                         break;
4532                 case -NFS4ERR_DENIED:
4533                         status = 0;
4534         }
4535         request->fl_ops->fl_release_private(request);
4536 out:
4537         return status;
4538 }
4539
4540 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4541 {
4542         struct nfs4_exception exception = { };
4543         int err;
4544
4545         do {
4546                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4547                                 _nfs4_proc_getlk(state, cmd, request),
4548                                 &exception);
4549         } while (exception.retry);
4550         return err;
4551 }
4552
4553 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4554 {
4555         int res = 0;
4556         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4557                 case FL_POSIX:
4558                         res = posix_lock_file_wait(file, fl);
4559                         break;
4560                 case FL_FLOCK:
4561                         res = flock_lock_file_wait(file, fl);
4562                         break;
4563                 default:
4564                         BUG();
4565         }
4566         return res;
4567 }
4568
4569 struct nfs4_unlockdata {
4570         struct nfs_locku_args arg;
4571         struct nfs_locku_res res;
4572         struct nfs4_lock_state *lsp;
4573         struct nfs_open_context *ctx;
4574         struct file_lock fl;
4575         const struct nfs_server *server;
4576         unsigned long timestamp;
4577 };
4578
4579 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4580                 struct nfs_open_context *ctx,
4581                 struct nfs4_lock_state *lsp,
4582                 struct nfs_seqid *seqid)
4583 {
4584         struct nfs4_unlockdata *p;
4585         struct inode *inode = lsp->ls_state->inode;
4586
4587         p = kzalloc(sizeof(*p), GFP_NOFS);
4588         if (p == NULL)
4589                 return NULL;
4590         p->arg.fh = NFS_FH(inode);
4591         p->arg.fl = &p->fl;
4592         p->arg.seqid = seqid;
4593         p->res.seqid = seqid;
4594         p->arg.stateid = &lsp->ls_stateid;
4595         p->lsp = lsp;
4596         atomic_inc(&lsp->ls_count);
4597         /* Ensure we don't close file until we're done freeing locks! */
4598         p->ctx = get_nfs_open_context(ctx);
4599         memcpy(&p->fl, fl, sizeof(p->fl));
4600         p->server = NFS_SERVER(inode);
4601         return p;
4602 }
4603
4604 static void nfs4_locku_release_calldata(void *data)
4605 {
4606         struct nfs4_unlockdata *calldata = data;
4607         nfs_free_seqid(calldata->arg.seqid);
4608         nfs4_put_lock_state(calldata->lsp);
4609         put_nfs_open_context(calldata->ctx);
4610         kfree(calldata);
4611 }
4612
4613 static void nfs4_locku_done(struct rpc_task *task, void *data)
4614 {
4615         struct nfs4_unlockdata *calldata = data;
4616
4617         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4618                 return;
4619         switch (task->tk_status) {
4620                 case 0:
4621                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4622                                         &calldata->res.stateid);
4623                         renew_lease(calldata->server, calldata->timestamp);
4624                         break;
4625                 case -NFS4ERR_BAD_STATEID:
4626                 case -NFS4ERR_OLD_STATEID:
4627                 case -NFS4ERR_STALE_STATEID:
4628                 case -NFS4ERR_EXPIRED:
4629                         break;
4630                 default:
4631                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4632                                 rpc_restart_call_prepare(task);
4633         }
4634         nfs_release_seqid(calldata->arg.seqid);
4635 }
4636
4637 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4638 {
4639         struct nfs4_unlockdata *calldata = data;
4640
4641         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4642                 goto out_wait;
4643         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4644                 /* Note: exit _without_ running nfs4_locku_done */
4645                 goto out_no_action;
4646         }
4647         calldata->timestamp = jiffies;
4648         if (nfs4_setup_sequence(calldata->server,
4649                                 &calldata->arg.seq_args,
4650                                 &calldata->res.seq_res,
4651                                 task) != 0)
4652                 nfs_release_seqid(calldata->arg.seqid);
4653         return;
4654 out_no_action:
4655         task->tk_action = NULL;
4656 out_wait:
4657         nfs4_sequence_done(task, &calldata->res.seq_res);
4658 }
4659
4660 static const struct rpc_call_ops nfs4_locku_ops = {
4661         .rpc_call_prepare = nfs4_locku_prepare,
4662         .rpc_call_done = nfs4_locku_done,
4663         .rpc_release = nfs4_locku_release_calldata,
4664 };
4665
4666 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4667                 struct nfs_open_context *ctx,
4668                 struct nfs4_lock_state *lsp,
4669                 struct nfs_seqid *seqid)
4670 {
4671         struct nfs4_unlockdata *data;
4672         struct rpc_message msg = {
4673                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4674                 .rpc_cred = ctx->cred,
4675         };
4676         struct rpc_task_setup task_setup_data = {
4677                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4678                 .rpc_message = &msg,
4679                 .callback_ops = &nfs4_locku_ops,
4680                 .workqueue = nfsiod_workqueue,
4681                 .flags = RPC_TASK_ASYNC,
4682         };
4683
4684         /* Ensure this is an unlock - when canceling a lock, the
4685          * canceled lock is passed in, and it won't be an unlock.
4686          */
4687         fl->fl_type = F_UNLCK;
4688
4689         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4690         if (data == NULL) {
4691                 nfs_free_seqid(seqid);
4692                 return ERR_PTR(-ENOMEM);
4693         }
4694
4695         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4696         msg.rpc_argp = &data->arg;
4697         msg.rpc_resp = &data->res;
4698         task_setup_data.callback_data = data;
4699         return rpc_run_task(&task_setup_data);
4700 }
4701
4702 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4703 {
4704         struct inode *inode = state->inode;
4705         struct nfs4_state_owner *sp = state->owner;
4706         struct nfs_inode *nfsi = NFS_I(inode);
4707         struct nfs_seqid *seqid;
4708         struct nfs4_lock_state *lsp;
4709         struct rpc_task *task;
4710         int status = 0;
4711         unsigned char fl_flags = request->fl_flags;
4712
4713         status = nfs4_set_lock_state(state, request);
4714         /* Unlock _before_ we do the RPC call */
4715         request->fl_flags |= FL_EXISTS;
4716         /* Exclude nfs_delegation_claim_locks() */
4717         mutex_lock(&sp->so_delegreturn_mutex);
4718         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4719         down_read(&nfsi->rwsem);
4720         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4721                 up_read(&nfsi->rwsem);
4722                 mutex_unlock(&sp->so_delegreturn_mutex);
4723                 goto out;
4724         }
4725         up_read(&nfsi->rwsem);
4726         mutex_unlock(&sp->so_delegreturn_mutex);
4727         if (status != 0)
4728                 goto out;
4729         /* Is this a delegated lock? */
4730         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4731                 goto out;
4732         lsp = request->fl_u.nfs4_fl.owner;
4733         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4734         status = -ENOMEM;
4735         if (seqid == NULL)
4736                 goto out;
4737         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4738         status = PTR_ERR(task);
4739         if (IS_ERR(task))
4740                 goto out;
4741         status = nfs4_wait_for_completion_rpc_task(task);
4742         rpc_put_task(task);
4743 out:
4744         request->fl_flags = fl_flags;
4745         return status;
4746 }
4747
4748 struct nfs4_lockdata {
4749         struct nfs_lock_args arg;
4750         struct nfs_lock_res res;
4751         struct nfs4_lock_state *lsp;
4752         struct nfs_open_context *ctx;
4753         struct file_lock fl;
4754         unsigned long timestamp;
4755         int rpc_status;
4756         int cancelled;
4757         struct nfs_server *server;
4758 };
4759
4760 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4761                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4762                 gfp_t gfp_mask)
4763 {
4764         struct nfs4_lockdata *p;
4765         struct inode *inode = lsp->ls_state->inode;
4766         struct nfs_server *server = NFS_SERVER(inode);
4767
4768         p = kzalloc(sizeof(*p), gfp_mask);
4769         if (p == NULL)
4770                 return NULL;
4771
4772         p->arg.fh = NFS_FH(inode);
4773         p->arg.fl = &p->fl;
4774         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4775         if (p->arg.open_seqid == NULL)
4776                 goto out_free;
4777         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4778         if (p->arg.lock_seqid == NULL)
4779                 goto out_free_seqid;
4780         p->arg.lock_stateid = &lsp->ls_stateid;
4781         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4782         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4783         p->arg.lock_owner.s_dev = server->s_dev;
4784         p->res.lock_seqid = p->arg.lock_seqid;
4785         p->lsp = lsp;
4786         p->server = server;
4787         atomic_inc(&lsp->ls_count);
4788         p->ctx = get_nfs_open_context(ctx);
4789         memcpy(&p->fl, fl, sizeof(p->fl));
4790         return p;
4791 out_free_seqid:
4792         nfs_free_seqid(p->arg.open_seqid);
4793 out_free:
4794         kfree(p);
4795         return NULL;
4796 }
4797
4798 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4799 {
4800         struct nfs4_lockdata *data = calldata;
4801         struct nfs4_state *state = data->lsp->ls_state;
4802
4803         dprintk("%s: begin!\n", __func__);
4804         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4805                 goto out_wait;
4806         /* Do we need to do an open_to_lock_owner? */
4807         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4808                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4809                         goto out_release_lock_seqid;
4810                 }
4811                 data->arg.open_stateid = &state->open_stateid;
4812                 data->arg.new_lock_owner = 1;
4813                 data->res.open_seqid = data->arg.open_seqid;
4814         } else
4815                 data->arg.new_lock_owner = 0;
4816         if (!nfs4_valid_open_stateid(state)) {
4817                 data->rpc_status = -EBADF;
4818                 task->tk_action = NULL;
4819                 goto out_release_open_seqid;
4820         }
4821         data->timestamp = jiffies;
4822         if (nfs4_setup_sequence(data->server,
4823                                 &data->arg.seq_args,
4824                                 &data->res.seq_res,
4825                                 task) == 0)
4826                 return;
4827 out_release_open_seqid:
4828         nfs_release_seqid(data->arg.open_seqid);
4829 out_release_lock_seqid:
4830         nfs_release_seqid(data->arg.lock_seqid);
4831 out_wait:
4832         nfs4_sequence_done(task, &data->res.seq_res);
4833         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4834 }
4835
4836 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4837 {
4838         struct nfs4_lockdata *data = calldata;
4839
4840         dprintk("%s: begin!\n", __func__);
4841
4842         if (!nfs4_sequence_done(task, &data->res.seq_res))
4843                 return;
4844
4845         data->rpc_status = task->tk_status;
4846         if (data->arg.new_lock_owner != 0) {
4847                 if (data->rpc_status == 0)
4848                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4849                 else
4850                         goto out;
4851         }
4852         if (data->rpc_status == 0) {
4853                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4854                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4855                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4856         }
4857 out:
4858         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4859 }
4860
4861 static void nfs4_lock_release(void *calldata)
4862 {
4863         struct nfs4_lockdata *data = calldata;
4864
4865         dprintk("%s: begin!\n", __func__);
4866         nfs_free_seqid(data->arg.open_seqid);
4867         if (data->cancelled != 0) {
4868                 struct rpc_task *task;
4869                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4870                                 data->arg.lock_seqid);
4871                 if (!IS_ERR(task))
4872                         rpc_put_task_async(task);
4873                 dprintk("%s: cancelling lock!\n", __func__);
4874         } else
4875                 nfs_free_seqid(data->arg.lock_seqid);
4876         nfs4_put_lock_state(data->lsp);
4877         put_nfs_open_context(data->ctx);
4878         kfree(data);
4879         dprintk("%s: done!\n", __func__);
4880 }
4881
4882 static const struct rpc_call_ops nfs4_lock_ops = {
4883         .rpc_call_prepare = nfs4_lock_prepare,
4884         .rpc_call_done = nfs4_lock_done,
4885         .rpc_release = nfs4_lock_release,
4886 };
4887
4888 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4889 {
4890         switch (error) {
4891         case -NFS4ERR_ADMIN_REVOKED:
4892         case -NFS4ERR_BAD_STATEID:
4893                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4894                 if (new_lock_owner != 0 ||
4895                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4896                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4897                 break;
4898         case -NFS4ERR_STALE_STATEID:
4899                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4900         case -NFS4ERR_EXPIRED:
4901                 nfs4_schedule_lease_recovery(server->nfs_client);
4902         };
4903 }
4904
4905 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4906 {
4907         struct nfs4_lockdata *data;
4908         struct rpc_task *task;
4909         struct rpc_message msg = {
4910                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4911                 .rpc_cred = state->owner->so_cred,
4912         };
4913         struct rpc_task_setup task_setup_data = {
4914                 .rpc_client = NFS_CLIENT(state->inode),
4915                 .rpc_message = &msg,
4916                 .callback_ops = &nfs4_lock_ops,
4917                 .workqueue = nfsiod_workqueue,
4918                 .flags = RPC_TASK_ASYNC,
4919         };
4920         int ret;
4921
4922         dprintk("%s: begin!\n", __func__);
4923         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4924                         fl->fl_u.nfs4_fl.owner,
4925                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4926         if (data == NULL)
4927                 return -ENOMEM;
4928         if (IS_SETLKW(cmd))
4929                 data->arg.block = 1;
4930         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4931         msg.rpc_argp = &data->arg;
4932         msg.rpc_resp = &data->res;
4933         task_setup_data.callback_data = data;
4934         if (recovery_type > NFS_LOCK_NEW) {
4935                 if (recovery_type == NFS_LOCK_RECLAIM)
4936                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4937                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4938         }
4939         task = rpc_run_task(&task_setup_data);
4940         if (IS_ERR(task))
4941                 return PTR_ERR(task);
4942         ret = nfs4_wait_for_completion_rpc_task(task);
4943         if (ret == 0) {
4944                 ret = data->rpc_status;
4945                 if (ret)
4946                         nfs4_handle_setlk_error(data->server, data->lsp,
4947                                         data->arg.new_lock_owner, ret);
4948         } else
4949                 data->cancelled = 1;
4950         rpc_put_task(task);
4951         dprintk("%s: done, ret = %d!\n", __func__, ret);
4952         return ret;
4953 }
4954
4955 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4956 {
4957         struct nfs_server *server = NFS_SERVER(state->inode);
4958         struct nfs4_exception exception = {
4959                 .inode = state->inode,
4960         };
4961         int err;
4962
4963         do {
4964                 /* Cache the lock if possible... */
4965                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4966                         return 0;
4967                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4968                 if (err != -NFS4ERR_DELAY)
4969                         break;
4970                 nfs4_handle_exception(server, err, &exception);
4971         } while (exception.retry);
4972         return err;
4973 }
4974
4975 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4976 {
4977         struct nfs_server *server = NFS_SERVER(state->inode);
4978         struct nfs4_exception exception = {
4979                 .inode = state->inode,
4980         };
4981         int err;
4982
4983         err = nfs4_set_lock_state(state, request);
4984         if (err != 0)
4985                 return err;
4986         do {
4987                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4988                         return 0;
4989                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4990                 switch (err) {
4991                 default:
4992                         goto out;
4993                 case -NFS4ERR_GRACE:
4994                 case -NFS4ERR_DELAY:
4995                         nfs4_handle_exception(server, err, &exception);
4996                         err = 0;
4997                 }
4998         } while (exception.retry);
4999 out:
5000         return err;
5001 }
5002
5003 #if defined(CONFIG_NFS_V4_1)
5004 /**
5005  * nfs41_check_expired_locks - possibly free a lock stateid
5006  *
5007  * @state: NFSv4 state for an inode
5008  *
5009  * Returns NFS_OK if recovery for this stateid is now finished.
5010  * Otherwise a negative NFS4ERR value is returned.
5011  */
5012 static int nfs41_check_expired_locks(struct nfs4_state *state)
5013 {
5014         int status, ret = -NFS4ERR_BAD_STATEID;
5015         struct nfs4_lock_state *lsp;
5016         struct nfs_server *server = NFS_SERVER(state->inode);
5017
5018         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5019                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5020                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
5021                         if (status != NFS_OK) {
5022                                 /* Free the stateid unless the server
5023                                  * informs us the stateid is unrecognized. */
5024                                 if (status != -NFS4ERR_BAD_STATEID)
5025                                         nfs41_free_stateid(server,
5026                                                         &lsp->ls_stateid);
5027                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5028                                 ret = status;
5029                         }
5030                 }
5031         };
5032
5033         return ret;
5034 }
5035
5036 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5037 {
5038         int status = NFS_OK;
5039
5040         if (test_bit(LK_STATE_IN_USE, &state->flags))
5041                 status = nfs41_check_expired_locks(state);
5042         if (status != NFS_OK)
5043                 status = nfs4_lock_expired(state, request);
5044         return status;
5045 }
5046 #endif
5047
5048 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5049 {
5050         struct nfs4_state_owner *sp = state->owner;
5051         struct nfs_inode *nfsi = NFS_I(state->inode);
5052         unsigned char fl_flags = request->fl_flags;
5053         unsigned int seq;
5054         int status = -ENOLCK;
5055
5056         if ((fl_flags & FL_POSIX) &&
5057                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5058                 goto out;
5059         /* Is this a delegated open? */
5060         status = nfs4_set_lock_state(state, request);
5061         if (status != 0)
5062                 goto out;
5063         request->fl_flags |= FL_ACCESS;
5064         status = do_vfs_lock(request->fl_file, request);
5065         if (status < 0)
5066                 goto out;
5067         down_read(&nfsi->rwsem);
5068         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5069                 /* Yes: cache locks! */
5070                 /* ...but avoid races with delegation recall... */
5071                 request->fl_flags = fl_flags & ~FL_SLEEP;
5072                 status = do_vfs_lock(request->fl_file, request);
5073                 goto out_unlock;
5074         }
5075         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5076         up_read(&nfsi->rwsem);
5077         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5078         if (status != 0)
5079                 goto out;
5080         down_read(&nfsi->rwsem);
5081         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5082                 status = -NFS4ERR_DELAY;
5083                 goto out_unlock;
5084         }
5085         /* Note: we always want to sleep here! */
5086         request->fl_flags = fl_flags | FL_SLEEP;
5087         if (do_vfs_lock(request->fl_file, request) < 0)
5088                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5089                         "manager!\n", __func__);
5090 out_unlock:
5091         up_read(&nfsi->rwsem);
5092 out:
5093         request->fl_flags = fl_flags;
5094         return status;
5095 }
5096
5097 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5098 {
5099         struct nfs4_exception exception = {
5100                 .state = state,
5101                 .inode = state->inode,
5102         };
5103         int err;
5104
5105         do {
5106                 err = _nfs4_proc_setlk(state, cmd, request);
5107                 if (err == -NFS4ERR_DENIED)
5108                         err = -EAGAIN;
5109                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5110                                 err, &exception);
5111         } while (exception.retry);
5112         return err;
5113 }
5114
5115 static int
5116 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5117 {
5118         struct nfs_open_context *ctx;
5119         struct nfs4_state *state;
5120         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5121         int status;
5122
5123         /* verify open state */
5124         ctx = nfs_file_open_context(filp);
5125         state = ctx->state;
5126
5127         if (request->fl_start < 0 || request->fl_end < 0)
5128                 return -EINVAL;
5129
5130         if (IS_GETLK(cmd)) {
5131                 if (state != NULL)
5132                         return nfs4_proc_getlk(state, F_GETLK, request);
5133                 return 0;
5134         }
5135
5136         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5137                 return -EINVAL;
5138
5139         if (request->fl_type == F_UNLCK) {
5140                 if (state != NULL)
5141                         return nfs4_proc_unlck(state, cmd, request);
5142                 return 0;
5143         }
5144
5145         if (state == NULL)
5146                 return -ENOLCK;
5147         /*
5148          * Don't rely on the VFS having checked the file open mode,
5149          * since it won't do this for flock() locks.
5150          */
5151         switch (request->fl_type) {
5152         case F_RDLCK:
5153                 if (!(filp->f_mode & FMODE_READ))
5154                         return -EBADF;
5155                 break;
5156         case F_WRLCK:
5157                 if (!(filp->f_mode & FMODE_WRITE))
5158                         return -EBADF;
5159         }
5160
5161         do {
5162                 status = nfs4_proc_setlk(state, cmd, request);
5163                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5164                         break;
5165                 timeout = nfs4_set_lock_task_retry(timeout);
5166                 status = -ERESTARTSYS;
5167                 if (signalled())
5168                         break;
5169         } while(status < 0);
5170         return status;
5171 }
5172
5173 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5174 {
5175         struct nfs_server *server = NFS_SERVER(state->inode);
5176         int err;
5177
5178         err = nfs4_set_lock_state(state, fl);
5179         if (err != 0)
5180                 return err;
5181         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5182         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5183 }
5184
5185 struct nfs_release_lockowner_data {
5186         struct nfs4_lock_state *lsp;
5187         struct nfs_server *server;
5188         struct nfs_release_lockowner_args args;
5189 };
5190
5191 static void nfs4_release_lockowner_release(void *calldata)
5192 {
5193         struct nfs_release_lockowner_data *data = calldata;
5194         nfs4_free_lock_state(data->server, data->lsp);
5195         kfree(calldata);
5196 }
5197
5198 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5199         .rpc_release = nfs4_release_lockowner_release,
5200 };
5201
5202 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5203 {
5204         struct nfs_server *server = lsp->ls_state->owner->so_server;
5205         struct nfs_release_lockowner_data *data;
5206         struct rpc_message msg = {
5207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5208         };
5209
5210         if (server->nfs_client->cl_mvops->minor_version != 0)
5211                 return -EINVAL;
5212         data = kmalloc(sizeof(*data), GFP_NOFS);
5213         if (!data)
5214                 return -ENOMEM;
5215         data->lsp = lsp;
5216         data->server = server;
5217         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5218         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5219         data->args.lock_owner.s_dev = server->s_dev;
5220         msg.rpc_argp = &data->args;
5221         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5222         return 0;
5223 }
5224
5225 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5226
5227 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5228                                    const void *buf, size_t buflen,
5229                                    int flags, int type)
5230 {
5231         if (strcmp(key, "") != 0)
5232                 return -EINVAL;
5233
5234         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5235 }
5236
5237 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5238                                    void *buf, size_t buflen, int type)
5239 {
5240         if (strcmp(key, "") != 0)
5241                 return -EINVAL;
5242
5243         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5244 }
5245
5246 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5247                                        size_t list_len, const char *name,
5248                                        size_t name_len, int type)
5249 {
5250         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5251
5252         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5253                 return 0;
5254
5255         if (list && len <= list_len)
5256                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5257         return len;
5258 }
5259
5260 /*
5261  * nfs_fhget will use either the mounted_on_fileid or the fileid
5262  */
5263 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5264 {
5265         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5266                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5267               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5268               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5269                 return;
5270
5271         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5272                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5273         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5274         fattr->nlink = 2;
5275 }
5276
5277 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5278                                    const struct qstr *name,
5279                                    struct nfs4_fs_locations *fs_locations,
5280                                    struct page *page)
5281 {
5282         struct nfs_server *server = NFS_SERVER(dir);
5283         u32 bitmask[2] = {
5284                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5285         };
5286         struct nfs4_fs_locations_arg args = {
5287                 .dir_fh = NFS_FH(dir),
5288                 .name = name,
5289                 .page = page,
5290                 .bitmask = bitmask,
5291         };
5292         struct nfs4_fs_locations_res res = {
5293                 .fs_locations = fs_locations,
5294         };
5295         struct rpc_message msg = {
5296                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5297                 .rpc_argp = &args,
5298                 .rpc_resp = &res,
5299         };
5300         int status;
5301
5302         dprintk("%s: start\n", __func__);
5303
5304         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5305          * is not supported */
5306         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5307                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5308         else
5309                 bitmask[0] |= FATTR4_WORD0_FILEID;
5310
5311         nfs_fattr_init(&fs_locations->fattr);
5312         fs_locations->server = server;
5313         fs_locations->nlocations = 0;
5314         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5315         dprintk("%s: returned status = %d\n", __func__, status);
5316         return status;
5317 }
5318
5319 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5320                            const struct qstr *name,
5321                            struct nfs4_fs_locations *fs_locations,
5322                            struct page *page)
5323 {
5324         struct nfs4_exception exception = { };
5325         int err;
5326         do {
5327                 err = nfs4_handle_exception(NFS_SERVER(dir),
5328                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5329                                 &exception);
5330         } while (exception.retry);
5331         return err;
5332 }
5333
5334 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5335 {
5336         int status;
5337         struct nfs4_secinfo_arg args = {
5338                 .dir_fh = NFS_FH(dir),
5339                 .name   = name,
5340         };
5341         struct nfs4_secinfo_res res = {
5342                 .flavors     = flavors,
5343         };
5344         struct rpc_message msg = {
5345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5346                 .rpc_argp = &args,
5347                 .rpc_resp = &res,
5348         };
5349
5350         dprintk("NFS call  secinfo %s\n", name->name);
5351         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5352         dprintk("NFS reply  secinfo: %d\n", status);
5353         return status;
5354 }
5355
5356 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5357                       struct nfs4_secinfo_flavors *flavors)
5358 {
5359         struct nfs4_exception exception = { };
5360         int err;
5361         do {
5362                 err = nfs4_handle_exception(NFS_SERVER(dir),
5363                                 _nfs4_proc_secinfo(dir, name, flavors),
5364                                 &exception);
5365         } while (exception.retry);
5366         return err;
5367 }
5368
5369 #ifdef CONFIG_NFS_V4_1
5370 /*
5371  * Check the exchange flags returned by the server for invalid flags, having
5372  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5373  * DS flags set.
5374  */
5375 static int nfs4_check_cl_exchange_flags(u32 flags)
5376 {
5377         if (flags & ~EXCHGID4_FLAG_MASK_R)
5378                 goto out_inval;
5379         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5380             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5381                 goto out_inval;
5382         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5383                 goto out_inval;
5384         return NFS_OK;
5385 out_inval:
5386         return -NFS4ERR_INVAL;
5387 }
5388
5389 static bool
5390 nfs41_same_server_scope(struct nfs41_server_scope *a,
5391                         struct nfs41_server_scope *b)
5392 {
5393         if (a->server_scope_sz == b->server_scope_sz &&
5394             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5395                 return true;
5396
5397         return false;
5398 }
5399
5400 /*
5401  * nfs4_proc_bind_conn_to_session()
5402  *
5403  * The 4.1 client currently uses the same TCP connection for the
5404  * fore and backchannel.
5405  */
5406 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5407 {
5408         int status;
5409         struct nfs41_bind_conn_to_session_res res;
5410         struct rpc_message msg = {
5411                 .rpc_proc =
5412                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5413                 .rpc_argp = clp,
5414                 .rpc_resp = &res,
5415                 .rpc_cred = cred,
5416         };
5417
5418         dprintk("--> %s\n", __func__);
5419
5420         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5421         if (unlikely(res.session == NULL)) {
5422                 status = -ENOMEM;
5423                 goto out;
5424         }
5425
5426         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5427         if (status == 0) {
5428                 if (memcmp(res.session->sess_id.data,
5429                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5430                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5431                         status = -EIO;
5432                         goto out_session;
5433                 }
5434                 if (res.dir != NFS4_CDFS4_BOTH) {
5435                         dprintk("NFS: %s: Unexpected direction from server\n",
5436                                 __func__);
5437                         status = -EIO;
5438                         goto out_session;
5439                 }
5440                 if (res.use_conn_in_rdma_mode) {
5441                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5442                                 __func__);
5443                         status = -EIO;
5444                         goto out_session;
5445                 }
5446         }
5447 out_session:
5448         kfree(res.session);
5449 out:
5450         dprintk("<-- %s status= %d\n", __func__, status);
5451         return status;
5452 }
5453
5454 /*
5455  * nfs4_proc_exchange_id()
5456  *
5457  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5458  *
5459  * Since the clientid has expired, all compounds using sessions
5460  * associated with the stale clientid will be returning
5461  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5462  * be in some phase of session reset.
5463  */
5464 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5465 {
5466         nfs4_verifier verifier;
5467         struct nfs41_exchange_id_args args = {
5468                 .verifier = &verifier,
5469                 .client = clp,
5470                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5471         };
5472         struct nfs41_exchange_id_res res = {
5473                 0
5474         };
5475         int status;
5476         struct rpc_message msg = {
5477                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5478                 .rpc_argp = &args,
5479                 .rpc_resp = &res,
5480                 .rpc_cred = cred,
5481         };
5482
5483         nfs4_init_boot_verifier(clp, &verifier);
5484         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5485                                                         sizeof(args.id));
5486         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5487                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5488                 args.id_len, args.id);
5489
5490         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5491                                         GFP_NOFS);
5492         if (unlikely(res.server_owner == NULL)) {
5493                 status = -ENOMEM;
5494                 goto out;
5495         }
5496
5497         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5498                                         GFP_NOFS);
5499         if (unlikely(res.server_scope == NULL)) {
5500                 status = -ENOMEM;
5501                 goto out_server_owner;
5502         }
5503
5504         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5505         if (unlikely(res.impl_id == NULL)) {
5506                 status = -ENOMEM;
5507                 goto out_server_scope;
5508         }
5509
5510         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5511         if (status == 0)
5512                 status = nfs4_check_cl_exchange_flags(res.flags);
5513
5514         if (status == 0) {
5515                 clp->cl_clientid = res.clientid;
5516                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5517                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5518                         clp->cl_seqid = res.seqid;
5519
5520                 kfree(clp->cl_serverowner);
5521                 clp->cl_serverowner = res.server_owner;
5522                 res.server_owner = NULL;
5523
5524                 /* use the most recent implementation id */
5525                 kfree(clp->cl_implid);
5526                 clp->cl_implid = res.impl_id;
5527
5528                 if (clp->cl_serverscope != NULL &&
5529                     !nfs41_same_server_scope(clp->cl_serverscope,
5530                                              res.server_scope)) {
5531                         dprintk("%s: server_scope mismatch detected\n",
5532                                 __func__);
5533                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5534                         kfree(clp->cl_serverscope);
5535                         clp->cl_serverscope = NULL;
5536                 }
5537
5538                 if (clp->cl_serverscope == NULL) {
5539                         clp->cl_serverscope = res.server_scope;
5540                         goto out;
5541                 }
5542         } else
5543                 kfree(res.impl_id);
5544
5545 out_server_owner:
5546         kfree(res.server_owner);
5547 out_server_scope:
5548         kfree(res.server_scope);
5549 out:
5550         if (clp->cl_implid != NULL)
5551                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5552                         "domain: %s, name: %s, date: %llu,%u\n",
5553                         clp->cl_implid->domain, clp->cl_implid->name,
5554                         clp->cl_implid->date.seconds,
5555                         clp->cl_implid->date.nseconds);
5556         dprintk("NFS reply exchange_id: %d\n", status);
5557         return status;
5558 }
5559
5560 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5561                 struct rpc_cred *cred)
5562 {
5563         struct rpc_message msg = {
5564                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5565                 .rpc_argp = clp,
5566                 .rpc_cred = cred,
5567         };
5568         int status;
5569
5570         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5571         if (status)
5572                 dprintk("NFS: Got error %d from the server %s on "
5573                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5574         return status;
5575 }
5576
5577 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5578                 struct rpc_cred *cred)
5579 {
5580         unsigned int loop;
5581         int ret;
5582
5583         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5584                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5585                 switch (ret) {
5586                 case -NFS4ERR_DELAY:
5587                 case -NFS4ERR_CLIENTID_BUSY:
5588                         ssleep(1);
5589                         break;
5590                 default:
5591                         return ret;
5592                 }
5593         }
5594         return 0;
5595 }
5596
5597 int nfs4_destroy_clientid(struct nfs_client *clp)
5598 {
5599         struct rpc_cred *cred;
5600         int ret = 0;
5601
5602         if (clp->cl_mvops->minor_version < 1)
5603                 goto out;
5604         if (clp->cl_exchange_flags == 0)
5605                 goto out;
5606         if (clp->cl_preserve_clid)
5607                 goto out;
5608         cred = nfs4_get_exchange_id_cred(clp);
5609         ret = nfs4_proc_destroy_clientid(clp, cred);
5610         if (cred)
5611                 put_rpccred(cred);
5612         switch (ret) {
5613         case 0:
5614         case -NFS4ERR_STALE_CLIENTID:
5615                 clp->cl_exchange_flags = 0;
5616         }
5617 out:
5618         return ret;
5619 }
5620
5621 struct nfs4_get_lease_time_data {
5622         struct nfs4_get_lease_time_args *args;
5623         struct nfs4_get_lease_time_res *res;
5624         struct nfs_client *clp;
5625 };
5626
5627 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5628                                         void *calldata)
5629 {
5630         struct nfs4_get_lease_time_data *data =
5631                         (struct nfs4_get_lease_time_data *)calldata;
5632
5633         dprintk("--> %s\n", __func__);
5634         /* just setup sequence, do not trigger session recovery
5635            since we're invoked within one */
5636         nfs41_setup_sequence(data->clp->cl_session,
5637                         &data->args->la_seq_args,
5638                         &data->res->lr_seq_res,
5639                         task);
5640         dprintk("<-- %s\n", __func__);
5641 }
5642
5643 /*
5644  * Called from nfs4_state_manager thread for session setup, so don't recover
5645  * from sequence operation or clientid errors.
5646  */
5647 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5648 {
5649         struct nfs4_get_lease_time_data *data =
5650                         (struct nfs4_get_lease_time_data *)calldata;
5651
5652         dprintk("--> %s\n", __func__);
5653         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5654                 return;
5655         switch (task->tk_status) {
5656         case -NFS4ERR_DELAY:
5657         case -NFS4ERR_GRACE:
5658                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5659                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5660                 task->tk_status = 0;
5661                 /* fall through */
5662         case -NFS4ERR_RETRY_UNCACHED_REP:
5663                 rpc_restart_call_prepare(task);
5664                 return;
5665         }
5666         dprintk("<-- %s\n", __func__);
5667 }
5668
5669 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5670         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5671         .rpc_call_done = nfs4_get_lease_time_done,
5672 };
5673
5674 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5675 {
5676         struct rpc_task *task;
5677         struct nfs4_get_lease_time_args args;
5678         struct nfs4_get_lease_time_res res = {
5679                 .lr_fsinfo = fsinfo,
5680         };
5681         struct nfs4_get_lease_time_data data = {
5682                 .args = &args,
5683                 .res = &res,
5684                 .clp = clp,
5685         };
5686         struct rpc_message msg = {
5687                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5688                 .rpc_argp = &args,
5689                 .rpc_resp = &res,
5690         };
5691         struct rpc_task_setup task_setup = {
5692                 .rpc_client = clp->cl_rpcclient,
5693                 .rpc_message = &msg,
5694                 .callback_ops = &nfs4_get_lease_time_ops,
5695                 .callback_data = &data,
5696                 .flags = RPC_TASK_TIMEOUT,
5697         };
5698         int status;
5699
5700         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5701         nfs4_set_sequence_privileged(&args.la_seq_args);
5702         dprintk("--> %s\n", __func__);
5703         task = rpc_run_task(&task_setup);
5704
5705         if (IS_ERR(task))
5706                 status = PTR_ERR(task);
5707         else {
5708                 status = task->tk_status;
5709                 rpc_put_task(task);
5710         }
5711         dprintk("<-- %s return %d\n", __func__, status);
5712
5713         return status;
5714 }
5715
5716 /*
5717  * Initialize the values to be used by the client in CREATE_SESSION
5718  * If nfs4_init_session set the fore channel request and response sizes,
5719  * use them.
5720  *
5721  * Set the back channel max_resp_sz_cached to zero to force the client to
5722  * always set csa_cachethis to FALSE because the current implementation
5723  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5724  */
5725 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5726 {
5727         struct nfs4_session *session = args->client->cl_session;
5728         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5729                      mxresp_sz = session->fc_target_max_resp_sz;
5730
5731         if (mxrqst_sz == 0)
5732                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5733         if (mxresp_sz == 0)
5734                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5735         /* Fore channel attributes */
5736         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5737         args->fc_attrs.max_resp_sz = mxresp_sz;
5738         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5739         args->fc_attrs.max_reqs = max_session_slots;
5740
5741         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5742                 "max_ops=%u max_reqs=%u\n",
5743                 __func__,
5744                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5745                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5746
5747         /* Back channel attributes */
5748         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5749         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5750         args->bc_attrs.max_resp_sz_cached = 0;
5751         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5752         args->bc_attrs.max_reqs = 1;
5753
5754         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5755                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5756                 __func__,
5757                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5758                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5759                 args->bc_attrs.max_reqs);
5760 }
5761
5762 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5763 {
5764         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5765         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5766
5767         if (rcvd->max_resp_sz > sent->max_resp_sz)
5768                 return -EINVAL;
5769         /*
5770          * Our requested max_ops is the minimum we need; we're not
5771          * prepared to break up compounds into smaller pieces than that.
5772          * So, no point even trying to continue if the server won't
5773          * cooperate:
5774          */
5775         if (rcvd->max_ops < sent->max_ops)
5776                 return -EINVAL;
5777         if (rcvd->max_reqs == 0)
5778                 return -EINVAL;
5779         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5780                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5781         return 0;
5782 }
5783
5784 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5785 {
5786         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5787         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5788
5789         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5790                 return -EINVAL;
5791         if (rcvd->max_resp_sz < sent->max_resp_sz)
5792                 return -EINVAL;
5793         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5794                 return -EINVAL;
5795         /* These would render the backchannel useless: */
5796         if (rcvd->max_ops != sent->max_ops)
5797                 return -EINVAL;
5798         if (rcvd->max_reqs != sent->max_reqs)
5799                 return -EINVAL;
5800         return 0;
5801 }
5802
5803 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5804                                      struct nfs4_session *session)
5805 {
5806         int ret;
5807
5808         ret = nfs4_verify_fore_channel_attrs(args, session);
5809         if (ret)
5810                 return ret;
5811         return nfs4_verify_back_channel_attrs(args, session);
5812 }
5813
5814 static int _nfs4_proc_create_session(struct nfs_client *clp,
5815                 struct rpc_cred *cred)
5816 {
5817         struct nfs4_session *session = clp->cl_session;
5818         struct nfs41_create_session_args args = {
5819                 .client = clp,
5820                 .cb_program = NFS4_CALLBACK,
5821         };
5822         struct nfs41_create_session_res res = {
5823                 .client = clp,
5824         };
5825         struct rpc_message msg = {
5826                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5827                 .rpc_argp = &args,
5828                 .rpc_resp = &res,
5829                 .rpc_cred = cred,
5830         };
5831         int status;
5832
5833         nfs4_init_channel_attrs(&args);
5834         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5835
5836         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5837
5838         if (!status) {
5839                 /* Verify the session's negotiated channel_attrs values */
5840                 status = nfs4_verify_channel_attrs(&args, session);
5841                 /* Increment the clientid slot sequence id */
5842                 clp->cl_seqid++;
5843         }
5844
5845         return status;
5846 }
5847
5848 /*
5849  * Issues a CREATE_SESSION operation to the server.
5850  * It is the responsibility of the caller to verify the session is
5851  * expired before calling this routine.
5852  */
5853 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5854 {
5855         int status;
5856         unsigned *ptr;
5857         struct nfs4_session *session = clp->cl_session;
5858
5859         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5860
5861         status = _nfs4_proc_create_session(clp, cred);
5862         if (status)
5863                 goto out;
5864
5865         /* Init or reset the session slot tables */
5866         status = nfs4_setup_session_slot_tables(session);
5867         dprintk("slot table setup returned %d\n", status);
5868         if (status)
5869                 goto out;
5870
5871         ptr = (unsigned *)&session->sess_id.data[0];
5872         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5873                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5874 out:
5875         dprintk("<-- %s\n", __func__);
5876         return status;
5877 }
5878
5879 /*
5880  * Issue the over-the-wire RPC DESTROY_SESSION.
5881  * The caller must serialize access to this routine.
5882  */
5883 int nfs4_proc_destroy_session(struct nfs4_session *session,
5884                 struct rpc_cred *cred)
5885 {
5886         struct rpc_message msg = {
5887                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5888                 .rpc_argp = session,
5889                 .rpc_cred = cred,
5890         };
5891         int status = 0;
5892
5893         dprintk("--> nfs4_proc_destroy_session\n");
5894
5895         /* session is still being setup */
5896         if (session->clp->cl_cons_state != NFS_CS_READY)
5897                 return status;
5898
5899         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5900
5901         if (status)
5902                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5903                         "Session has been destroyed regardless...\n", status);
5904
5905         dprintk("<-- nfs4_proc_destroy_session\n");
5906         return status;
5907 }
5908
5909 /*
5910  * Renew the cl_session lease.
5911  */
5912 struct nfs4_sequence_data {
5913         struct nfs_client *clp;
5914         struct nfs4_sequence_args args;
5915         struct nfs4_sequence_res res;
5916 };
5917
5918 static void nfs41_sequence_release(void *data)
5919 {
5920         struct nfs4_sequence_data *calldata = data;
5921         struct nfs_client *clp = calldata->clp;
5922
5923         if (atomic_read(&clp->cl_count) > 1)
5924                 nfs4_schedule_state_renewal(clp);
5925         nfs_put_client(clp);
5926         kfree(calldata);
5927 }
5928
5929 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5930 {
5931         switch(task->tk_status) {
5932         case -NFS4ERR_DELAY:
5933                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5934                 return -EAGAIN;
5935         default:
5936                 nfs4_schedule_lease_recovery(clp);
5937         }
5938         return 0;
5939 }
5940
5941 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5942 {
5943         struct nfs4_sequence_data *calldata = data;
5944         struct nfs_client *clp = calldata->clp;
5945
5946         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5947                 return;
5948
5949         if (task->tk_status < 0) {
5950                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5951                 if (atomic_read(&clp->cl_count) == 1)
5952                         goto out;
5953
5954                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5955                         rpc_restart_call_prepare(task);
5956                         return;
5957                 }
5958         }
5959         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5960 out:
5961         dprintk("<-- %s\n", __func__);
5962 }
5963
5964 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5965 {
5966         struct nfs4_sequence_data *calldata = data;
5967         struct nfs_client *clp = calldata->clp;
5968         struct nfs4_sequence_args *args;
5969         struct nfs4_sequence_res *res;
5970
5971         args = task->tk_msg.rpc_argp;
5972         res = task->tk_msg.rpc_resp;
5973
5974         nfs41_setup_sequence(clp->cl_session, args, res, task);
5975 }
5976
5977 static const struct rpc_call_ops nfs41_sequence_ops = {
5978         .rpc_call_done = nfs41_sequence_call_done,
5979         .rpc_call_prepare = nfs41_sequence_prepare,
5980         .rpc_release = nfs41_sequence_release,
5981 };
5982
5983 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5984                 struct rpc_cred *cred,
5985                 bool is_privileged)
5986 {
5987         struct nfs4_sequence_data *calldata;
5988         struct rpc_message msg = {
5989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5990                 .rpc_cred = cred,
5991         };
5992         struct rpc_task_setup task_setup_data = {
5993                 .rpc_client = clp->cl_rpcclient,
5994                 .rpc_message = &msg,
5995                 .callback_ops = &nfs41_sequence_ops,
5996                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
5997         };
5998
5999         if (!atomic_inc_not_zero(&clp->cl_count))
6000                 return ERR_PTR(-EIO);
6001         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6002         if (calldata == NULL) {
6003                 nfs_put_client(clp);
6004                 return ERR_PTR(-ENOMEM);
6005         }
6006         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6007         if (is_privileged)
6008                 nfs4_set_sequence_privileged(&calldata->args);
6009         msg.rpc_argp = &calldata->args;
6010         msg.rpc_resp = &calldata->res;
6011         calldata->clp = clp;
6012         task_setup_data.callback_data = calldata;
6013
6014         return rpc_run_task(&task_setup_data);
6015 }
6016
6017 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6018 {
6019         struct rpc_task *task;
6020         int ret = 0;
6021
6022         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6023                 return 0;
6024         task = _nfs41_proc_sequence(clp, cred, false);
6025         if (IS_ERR(task))
6026                 ret = PTR_ERR(task);
6027         else
6028                 rpc_put_task_async(task);
6029         dprintk("<-- %s status=%d\n", __func__, ret);
6030         return ret;
6031 }
6032
6033 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6034 {
6035         struct rpc_task *task;
6036         int ret;
6037
6038         task = _nfs41_proc_sequence(clp, cred, true);
6039         if (IS_ERR(task)) {
6040                 ret = PTR_ERR(task);
6041                 goto out;
6042         }
6043         ret = rpc_wait_for_completion_task(task);
6044         if (!ret) {
6045                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6046
6047                 if (task->tk_status == 0)
6048                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6049                 ret = task->tk_status;
6050         }
6051         rpc_put_task(task);
6052 out:
6053         dprintk("<-- %s status=%d\n", __func__, ret);
6054         return ret;
6055 }
6056
6057 struct nfs4_reclaim_complete_data {
6058         struct nfs_client *clp;
6059         struct nfs41_reclaim_complete_args arg;
6060         struct nfs41_reclaim_complete_res res;
6061 };
6062
6063 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6064 {
6065         struct nfs4_reclaim_complete_data *calldata = data;
6066
6067         nfs41_setup_sequence(calldata->clp->cl_session,
6068                         &calldata->arg.seq_args,
6069                         &calldata->res.seq_res,
6070                         task);
6071 }
6072
6073 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6074 {
6075         switch(task->tk_status) {
6076         case 0:
6077         case -NFS4ERR_COMPLETE_ALREADY:
6078         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6079                 break;
6080         case -NFS4ERR_DELAY:
6081                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6082                 /* fall through */
6083         case -NFS4ERR_RETRY_UNCACHED_REP:
6084                 return -EAGAIN;
6085         default:
6086                 nfs4_schedule_lease_recovery(clp);
6087         }
6088         return 0;
6089 }
6090
6091 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6092 {
6093         struct nfs4_reclaim_complete_data *calldata = data;
6094         struct nfs_client *clp = calldata->clp;
6095         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6096
6097         dprintk("--> %s\n", __func__);
6098         if (!nfs41_sequence_done(task, res))
6099                 return;
6100
6101         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6102                 rpc_restart_call_prepare(task);
6103                 return;
6104         }
6105         dprintk("<-- %s\n", __func__);
6106 }
6107
6108 static void nfs4_free_reclaim_complete_data(void *data)
6109 {
6110         struct nfs4_reclaim_complete_data *calldata = data;
6111
6112         kfree(calldata);
6113 }
6114
6115 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6116         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6117         .rpc_call_done = nfs4_reclaim_complete_done,
6118         .rpc_release = nfs4_free_reclaim_complete_data,
6119 };
6120
6121 /*
6122  * Issue a global reclaim complete.
6123  */
6124 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6125 {
6126         struct nfs4_reclaim_complete_data *calldata;
6127         struct rpc_task *task;
6128         struct rpc_message msg = {
6129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6130         };
6131         struct rpc_task_setup task_setup_data = {
6132                 .rpc_client = clp->cl_rpcclient,
6133                 .rpc_message = &msg,
6134                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6135                 .flags = RPC_TASK_ASYNC,
6136         };
6137         int status = -ENOMEM;
6138
6139         dprintk("--> %s\n", __func__);
6140         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6141         if (calldata == NULL)
6142                 goto out;
6143         calldata->clp = clp;
6144         calldata->arg.one_fs = 0;
6145
6146         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6147         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6148         msg.rpc_argp = &calldata->arg;
6149         msg.rpc_resp = &calldata->res;
6150         task_setup_data.callback_data = calldata;
6151         task = rpc_run_task(&task_setup_data);
6152         if (IS_ERR(task)) {
6153                 status = PTR_ERR(task);
6154                 goto out;
6155         }
6156         status = nfs4_wait_for_completion_rpc_task(task);
6157         if (status == 0)
6158                 status = task->tk_status;
6159         rpc_put_task(task);
6160         return 0;
6161 out:
6162         dprintk("<-- %s status=%d\n", __func__, status);
6163         return status;
6164 }
6165
6166 static void
6167 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6168 {
6169         struct nfs4_layoutget *lgp = calldata;
6170         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6171         struct nfs4_session *session = nfs4_get_session(server);
6172
6173         dprintk("--> %s\n", __func__);
6174         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6175          * right now covering the LAYOUTGET we are about to send.
6176          * However, that is not so catastrophic, and there seems
6177          * to be no way to prevent it completely.
6178          */
6179         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6180                                 &lgp->res.seq_res, task))
6181                 return;
6182         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6183                                           NFS_I(lgp->args.inode)->layout,
6184                                           lgp->args.ctx->state)) {
6185                 rpc_exit(task, NFS4_OK);
6186         }
6187 }
6188
6189 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6190 {
6191         struct nfs4_layoutget *lgp = calldata;
6192         struct inode *inode = lgp->args.inode;
6193         struct nfs_server *server = NFS_SERVER(inode);
6194         struct pnfs_layout_hdr *lo;
6195         struct nfs4_state *state = NULL;
6196         unsigned long timeo, giveup;
6197
6198         dprintk("--> %s\n", __func__);
6199
6200         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6201                 goto out;
6202
6203         switch (task->tk_status) {
6204         case 0:
6205                 goto out;
6206         case -NFS4ERR_LAYOUTTRYLATER:
6207         case -NFS4ERR_RECALLCONFLICT:
6208                 timeo = rpc_get_timeout(task->tk_client);
6209                 giveup = lgp->args.timestamp + timeo;
6210                 if (time_after(giveup, jiffies))
6211                         task->tk_status = -NFS4ERR_DELAY;
6212                 break;
6213         case -NFS4ERR_EXPIRED:
6214         case -NFS4ERR_BAD_STATEID:
6215                 spin_lock(&inode->i_lock);
6216                 lo = NFS_I(inode)->layout;
6217                 if (!lo || list_empty(&lo->plh_segs)) {
6218                         spin_unlock(&inode->i_lock);
6219                         /* If the open stateid was bad, then recover it. */
6220                         state = lgp->args.ctx->state;
6221                 } else {
6222                         LIST_HEAD(head);
6223
6224                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6225                         spin_unlock(&inode->i_lock);
6226                         /* Mark the bad layout state as invalid, then
6227                          * retry using the open stateid. */
6228                         pnfs_free_lseg_list(&head);
6229                 }
6230         }
6231         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6232                 rpc_restart_call_prepare(task);
6233 out:
6234         dprintk("<-- %s\n", __func__);
6235 }
6236
6237 static size_t max_response_pages(struct nfs_server *server)
6238 {
6239         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6240         return nfs_page_array_len(0, max_resp_sz);
6241 }
6242
6243 static void nfs4_free_pages(struct page **pages, size_t size)
6244 {
6245         int i;
6246
6247         if (!pages)
6248                 return;
6249
6250         for (i = 0; i < size; i++) {
6251                 if (!pages[i])
6252                         break;
6253                 __free_page(pages[i]);
6254         }
6255         kfree(pages);
6256 }
6257
6258 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6259 {
6260         struct page **pages;
6261         int i;
6262
6263         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6264         if (!pages) {
6265                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6266                 return NULL;
6267         }
6268
6269         for (i = 0; i < size; i++) {
6270                 pages[i] = alloc_page(gfp_flags);
6271                 if (!pages[i]) {
6272                         dprintk("%s: failed to allocate page\n", __func__);
6273                         nfs4_free_pages(pages, size);
6274                         return NULL;
6275                 }
6276         }
6277
6278         return pages;
6279 }
6280
6281 static void nfs4_layoutget_release(void *calldata)
6282 {
6283         struct nfs4_layoutget *lgp = calldata;
6284         struct inode *inode = lgp->args.inode;
6285         struct nfs_server *server = NFS_SERVER(inode);
6286         size_t max_pages = max_response_pages(server);
6287
6288         dprintk("--> %s\n", __func__);
6289         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6290         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6291         put_nfs_open_context(lgp->args.ctx);
6292         kfree(calldata);
6293         dprintk("<-- %s\n", __func__);
6294 }
6295
6296 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6297         .rpc_call_prepare = nfs4_layoutget_prepare,
6298         .rpc_call_done = nfs4_layoutget_done,
6299         .rpc_release = nfs4_layoutget_release,
6300 };
6301
6302 struct pnfs_layout_segment *
6303 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6304 {
6305         struct inode *inode = lgp->args.inode;
6306         struct nfs_server *server = NFS_SERVER(inode);
6307         size_t max_pages = max_response_pages(server);
6308         struct rpc_task *task;
6309         struct rpc_message msg = {
6310                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6311                 .rpc_argp = &lgp->args,
6312                 .rpc_resp = &lgp->res,
6313         };
6314         struct rpc_task_setup task_setup_data = {
6315                 .rpc_client = server->client,
6316                 .rpc_message = &msg,
6317                 .callback_ops = &nfs4_layoutget_call_ops,
6318                 .callback_data = lgp,
6319                 .flags = RPC_TASK_ASYNC,
6320         };
6321         struct pnfs_layout_segment *lseg = NULL;
6322         int status = 0;
6323
6324         dprintk("--> %s\n", __func__);
6325
6326         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6327         if (!lgp->args.layout.pages) {
6328                 nfs4_layoutget_release(lgp);
6329                 return ERR_PTR(-ENOMEM);
6330         }
6331         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6332         lgp->args.timestamp = jiffies;
6333
6334         lgp->res.layoutp = &lgp->args.layout;
6335         lgp->res.seq_res.sr_slot = NULL;
6336         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6337
6338         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6339         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6340
6341         task = rpc_run_task(&task_setup_data);
6342         if (IS_ERR(task))
6343                 return ERR_CAST(task);
6344         status = nfs4_wait_for_completion_rpc_task(task);
6345         if (status == 0)
6346                 status = task->tk_status;
6347         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6348         if (status == 0 && lgp->res.layoutp->len)
6349                 lseg = pnfs_layout_process(lgp);
6350         rpc_put_task(task);
6351         dprintk("<-- %s status=%d\n", __func__, status);
6352         if (status)
6353                 return ERR_PTR(status);
6354         return lseg;
6355 }
6356
6357 static void
6358 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6359 {
6360         struct nfs4_layoutreturn *lrp = calldata;
6361
6362         dprintk("--> %s\n", __func__);
6363         nfs41_setup_sequence(lrp->clp->cl_session,
6364                         &lrp->args.seq_args,
6365                         &lrp->res.seq_res,
6366                         task);
6367 }
6368
6369 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6370 {
6371         struct nfs4_layoutreturn *lrp = calldata;
6372         struct nfs_server *server;
6373
6374         dprintk("--> %s\n", __func__);
6375
6376         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6377                 return;
6378
6379         server = NFS_SERVER(lrp->args.inode);
6380         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6381                 rpc_restart_call_prepare(task);
6382                 return;
6383         }
6384         dprintk("<-- %s\n", __func__);
6385 }
6386
6387 static void nfs4_layoutreturn_release(void *calldata)
6388 {
6389         struct nfs4_layoutreturn *lrp = calldata;
6390         struct pnfs_layout_hdr *lo = lrp->args.layout;
6391
6392         dprintk("--> %s\n", __func__);
6393         spin_lock(&lo->plh_inode->i_lock);
6394         if (lrp->res.lrs_present)
6395                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6396         lo->plh_block_lgets--;
6397         spin_unlock(&lo->plh_inode->i_lock);
6398         pnfs_put_layout_hdr(lrp->args.layout);
6399         kfree(calldata);
6400         dprintk("<-- %s\n", __func__);
6401 }
6402
6403 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6404         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6405         .rpc_call_done = nfs4_layoutreturn_done,
6406         .rpc_release = nfs4_layoutreturn_release,
6407 };
6408
6409 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6410 {
6411         struct rpc_task *task;
6412         struct rpc_message msg = {
6413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6414                 .rpc_argp = &lrp->args,
6415                 .rpc_resp = &lrp->res,
6416         };
6417         struct rpc_task_setup task_setup_data = {
6418                 .rpc_client = lrp->clp->cl_rpcclient,
6419                 .rpc_message = &msg,
6420                 .callback_ops = &nfs4_layoutreturn_call_ops,
6421                 .callback_data = lrp,
6422         };
6423         int status;
6424
6425         dprintk("--> %s\n", __func__);
6426         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6427         task = rpc_run_task(&task_setup_data);
6428         if (IS_ERR(task))
6429                 return PTR_ERR(task);
6430         status = task->tk_status;
6431         dprintk("<-- %s status=%d\n", __func__, status);
6432         rpc_put_task(task);
6433         return status;
6434 }
6435
6436 /*
6437  * Retrieve the list of Data Server devices from the MDS.
6438  */
6439 static int _nfs4_getdevicelist(struct nfs_server *server,
6440                                     const struct nfs_fh *fh,
6441                                     struct pnfs_devicelist *devlist)
6442 {
6443         struct nfs4_getdevicelist_args args = {
6444                 .fh = fh,
6445                 .layoutclass = server->pnfs_curr_ld->id,
6446         };
6447         struct nfs4_getdevicelist_res res = {
6448                 .devlist = devlist,
6449         };
6450         struct rpc_message msg = {
6451                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6452                 .rpc_argp = &args,
6453                 .rpc_resp = &res,
6454         };
6455         int status;
6456
6457         dprintk("--> %s\n", __func__);
6458         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6459                                 &res.seq_res, 0);
6460         dprintk("<-- %s status=%d\n", __func__, status);
6461         return status;
6462 }
6463
6464 int nfs4_proc_getdevicelist(struct nfs_server *server,
6465                             const struct nfs_fh *fh,
6466                             struct pnfs_devicelist *devlist)
6467 {
6468         struct nfs4_exception exception = { };
6469         int err;
6470
6471         do {
6472                 err = nfs4_handle_exception(server,
6473                                 _nfs4_getdevicelist(server, fh, devlist),
6474                                 &exception);
6475         } while (exception.retry);
6476
6477         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6478                 err, devlist->num_devs);
6479
6480         return err;
6481 }
6482 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6483
6484 static int
6485 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6486 {
6487         struct nfs4_getdeviceinfo_args args = {
6488                 .pdev = pdev,
6489         };
6490         struct nfs4_getdeviceinfo_res res = {
6491                 .pdev = pdev,
6492         };
6493         struct rpc_message msg = {
6494                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6495                 .rpc_argp = &args,
6496                 .rpc_resp = &res,
6497         };
6498         int status;
6499
6500         dprintk("--> %s\n", __func__);
6501         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6502         dprintk("<-- %s status=%d\n", __func__, status);
6503
6504         return status;
6505 }
6506
6507 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6508 {
6509         struct nfs4_exception exception = { };
6510         int err;
6511
6512         do {
6513                 err = nfs4_handle_exception(server,
6514                                         _nfs4_proc_getdeviceinfo(server, pdev),
6515                                         &exception);
6516         } while (exception.retry);
6517         return err;
6518 }
6519 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6520
6521 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6522 {
6523         struct nfs4_layoutcommit_data *data = calldata;
6524         struct nfs_server *server = NFS_SERVER(data->args.inode);
6525         struct nfs4_session *session = nfs4_get_session(server);
6526
6527         nfs41_setup_sequence(session,
6528                         &data->args.seq_args,
6529                         &data->res.seq_res,
6530                         task);
6531 }
6532
6533 static void
6534 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6535 {
6536         struct nfs4_layoutcommit_data *data = calldata;
6537         struct nfs_server *server = NFS_SERVER(data->args.inode);
6538
6539         if (!nfs41_sequence_done(task, &data->res.seq_res))
6540                 return;
6541
6542         switch (task->tk_status) { /* Just ignore these failures */
6543         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6544         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6545         case -NFS4ERR_BADLAYOUT:     /* no layout */
6546         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6547                 task->tk_status = 0;
6548                 break;
6549         case 0:
6550                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6551                                                    data->res.fattr);
6552                 break;
6553         default:
6554                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6555                         rpc_restart_call_prepare(task);
6556                         return;
6557                 }
6558         }
6559 }
6560
6561 static void nfs4_layoutcommit_release(void *calldata)
6562 {
6563         struct nfs4_layoutcommit_data *data = calldata;
6564
6565         pnfs_cleanup_layoutcommit(data);
6566         put_rpccred(data->cred);
6567         kfree(data);
6568 }
6569
6570 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6571         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6572         .rpc_call_done = nfs4_layoutcommit_done,
6573         .rpc_release = nfs4_layoutcommit_release,
6574 };
6575
6576 int
6577 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6578 {
6579         struct rpc_message msg = {
6580                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6581                 .rpc_argp = &data->args,
6582                 .rpc_resp = &data->res,
6583                 .rpc_cred = data->cred,
6584         };
6585         struct rpc_task_setup task_setup_data = {
6586                 .task = &data->task,
6587                 .rpc_client = NFS_CLIENT(data->args.inode),
6588                 .rpc_message = &msg,
6589                 .callback_ops = &nfs4_layoutcommit_ops,
6590                 .callback_data = data,
6591                 .flags = RPC_TASK_ASYNC,
6592         };
6593         struct rpc_task *task;
6594         int status = 0;
6595
6596         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6597                 "lbw: %llu inode %lu\n",
6598                 data->task.tk_pid, sync,
6599                 data->args.lastbytewritten,
6600                 data->args.inode->i_ino);
6601
6602         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6603         task = rpc_run_task(&task_setup_data);
6604         if (IS_ERR(task))
6605                 return PTR_ERR(task);
6606         if (sync == false)
6607                 goto out;
6608         status = nfs4_wait_for_completion_rpc_task(task);
6609         if (status != 0)
6610                 goto out;
6611         status = task->tk_status;
6612 out:
6613         dprintk("%s: status %d\n", __func__, status);
6614         rpc_put_task(task);
6615         return status;
6616 }
6617
6618 static int
6619 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6620                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6621 {
6622         struct nfs41_secinfo_no_name_args args = {
6623                 .style = SECINFO_STYLE_CURRENT_FH,
6624         };
6625         struct nfs4_secinfo_res res = {
6626                 .flavors = flavors,
6627         };
6628         struct rpc_message msg = {
6629                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6630                 .rpc_argp = &args,
6631                 .rpc_resp = &res,
6632         };
6633         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6634 }
6635
6636 static int
6637 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6638                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6639 {
6640         struct nfs4_exception exception = { };
6641         int err;
6642         do {
6643                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6644                 switch (err) {
6645                 case 0:
6646                 case -NFS4ERR_WRONGSEC:
6647                 case -NFS4ERR_NOTSUPP:
6648                         goto out;
6649                 default:
6650                         err = nfs4_handle_exception(server, err, &exception);
6651                 }
6652         } while (exception.retry);
6653 out:
6654         return err;
6655 }
6656
6657 static int
6658 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6659                     struct nfs_fsinfo *info)
6660 {
6661         int err;
6662         struct page *page;
6663         rpc_authflavor_t flavor;
6664         struct nfs4_secinfo_flavors *flavors;
6665
6666         page = alloc_page(GFP_KERNEL);
6667         if (!page) {
6668                 err = -ENOMEM;
6669                 goto out;
6670         }
6671
6672         flavors = page_address(page);
6673         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6674
6675         /*
6676          * Fall back on "guess and check" method if
6677          * the server doesn't support SECINFO_NO_NAME
6678          */
6679         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6680                 err = nfs4_find_root_sec(server, fhandle, info);
6681                 goto out_freepage;
6682         }
6683         if (err)
6684                 goto out_freepage;
6685
6686         flavor = nfs_find_best_sec(flavors);
6687         if (err == 0)
6688                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6689
6690 out_freepage:
6691         put_page(page);
6692         if (err == -EACCES)
6693                 return -EPERM;
6694 out:
6695         return err;
6696 }
6697
6698 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6699 {
6700         int status;
6701         struct nfs41_test_stateid_args args = {
6702                 .stateid = stateid,
6703         };
6704         struct nfs41_test_stateid_res res;
6705         struct rpc_message msg = {
6706                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6707                 .rpc_argp = &args,
6708                 .rpc_resp = &res,
6709         };
6710
6711         dprintk("NFS call  test_stateid %p\n", stateid);
6712         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6713         nfs4_set_sequence_privileged(&args.seq_args);
6714         status = nfs4_call_sync_sequence(server->client, server, &msg,
6715                         &args.seq_args, &res.seq_res);
6716         if (status != NFS_OK) {
6717                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6718                 return status;
6719         }
6720         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6721         return -res.status;
6722 }
6723
6724 /**
6725  * nfs41_test_stateid - perform a TEST_STATEID operation
6726  *
6727  * @server: server / transport on which to perform the operation
6728  * @stateid: state ID to test
6729  *
6730  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6731  * Otherwise a negative NFS4ERR value is returned if the operation
6732  * failed or the state ID is not currently valid.
6733  */
6734 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6735 {
6736         struct nfs4_exception exception = { };
6737         int err;
6738         do {
6739                 err = _nfs41_test_stateid(server, stateid);
6740                 if (err != -NFS4ERR_DELAY)
6741                         break;
6742                 nfs4_handle_exception(server, err, &exception);
6743         } while (exception.retry);
6744         return err;
6745 }
6746
6747 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6748 {
6749         struct nfs41_free_stateid_args args = {
6750                 .stateid = stateid,
6751         };
6752         struct nfs41_free_stateid_res res;
6753         struct rpc_message msg = {
6754                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6755                 .rpc_argp = &args,
6756                 .rpc_resp = &res,
6757         };
6758         int status;
6759
6760         dprintk("NFS call  free_stateid %p\n", stateid);
6761         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6762         nfs4_set_sequence_privileged(&args.seq_args);
6763         status = nfs4_call_sync_sequence(server->client, server, &msg,
6764                         &args.seq_args, &res.seq_res);
6765         dprintk("NFS reply free_stateid: %d\n", status);
6766         return status;
6767 }
6768
6769 /**
6770  * nfs41_free_stateid - perform a FREE_STATEID operation
6771  *
6772  * @server: server / transport on which to perform the operation
6773  * @stateid: state ID to release
6774  *
6775  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6776  * negative NFS4ERR value is returned.
6777  */
6778 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6779 {
6780         struct nfs4_exception exception = { };
6781         int err;
6782         do {
6783                 err = _nfs4_free_stateid(server, stateid);
6784                 if (err != -NFS4ERR_DELAY)
6785                         break;
6786                 nfs4_handle_exception(server, err, &exception);
6787         } while (exception.retry);
6788         return err;
6789 }
6790
6791 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6792                 const nfs4_stateid *s2)
6793 {
6794         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6795                 return false;
6796
6797         if (s1->seqid == s2->seqid)
6798                 return true;
6799         if (s1->seqid == 0 || s2->seqid == 0)
6800                 return true;
6801
6802         return false;
6803 }
6804
6805 #endif /* CONFIG_NFS_V4_1 */
6806
6807 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6808                 const nfs4_stateid *s2)
6809 {
6810         return nfs4_stateid_match(s1, s2);
6811 }
6812
6813
6814 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6815         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6816         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6817         .recover_open   = nfs4_open_reclaim,
6818         .recover_lock   = nfs4_lock_reclaim,
6819         .establish_clid = nfs4_init_clientid,
6820         .get_clid_cred  = nfs4_get_setclientid_cred,
6821         .detect_trunking = nfs40_discover_server_trunking,
6822 };
6823
6824 #if defined(CONFIG_NFS_V4_1)
6825 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6826         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6827         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6828         .recover_open   = nfs4_open_reclaim,
6829         .recover_lock   = nfs4_lock_reclaim,
6830         .establish_clid = nfs41_init_clientid,
6831         .get_clid_cred  = nfs4_get_exchange_id_cred,
6832         .reclaim_complete = nfs41_proc_reclaim_complete,
6833         .detect_trunking = nfs41_discover_server_trunking,
6834 };
6835 #endif /* CONFIG_NFS_V4_1 */
6836
6837 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6838         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6839         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6840         .recover_open   = nfs4_open_expired,
6841         .recover_lock   = nfs4_lock_expired,
6842         .establish_clid = nfs4_init_clientid,
6843         .get_clid_cred  = nfs4_get_setclientid_cred,
6844 };
6845
6846 #if defined(CONFIG_NFS_V4_1)
6847 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6848         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6849         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6850         .recover_open   = nfs41_open_expired,
6851         .recover_lock   = nfs41_lock_expired,
6852         .establish_clid = nfs41_init_clientid,
6853         .get_clid_cred  = nfs4_get_exchange_id_cred,
6854 };
6855 #endif /* CONFIG_NFS_V4_1 */
6856
6857 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6858         .sched_state_renewal = nfs4_proc_async_renew,
6859         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6860         .renew_lease = nfs4_proc_renew,
6861 };
6862
6863 #if defined(CONFIG_NFS_V4_1)
6864 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6865         .sched_state_renewal = nfs41_proc_async_sequence,
6866         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6867         .renew_lease = nfs4_proc_sequence,
6868 };
6869 #endif
6870
6871 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6872         .minor_version = 0,
6873         .init_caps = NFS_CAP_READDIRPLUS
6874                 | NFS_CAP_ATOMIC_OPEN
6875                 | NFS_CAP_CHANGE_ATTR
6876                 | NFS_CAP_POSIX_LOCK,
6877         .call_sync = _nfs4_call_sync,
6878         .match_stateid = nfs4_match_stateid,
6879         .find_root_sec = nfs4_find_root_sec,
6880         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6881         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6882         .state_renewal_ops = &nfs40_state_renewal_ops,
6883 };
6884
6885 #if defined(CONFIG_NFS_V4_1)
6886 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6887         .minor_version = 1,
6888         .init_caps = NFS_CAP_READDIRPLUS
6889                 | NFS_CAP_ATOMIC_OPEN
6890                 | NFS_CAP_CHANGE_ATTR
6891                 | NFS_CAP_POSIX_LOCK
6892                 | NFS_CAP_STATEID_NFSV41
6893                 | NFS_CAP_ATOMIC_OPEN_V1,
6894         .call_sync = nfs4_call_sync_sequence,
6895         .match_stateid = nfs41_match_stateid,
6896         .find_root_sec = nfs41_find_root_sec,
6897         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6898         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6899         .state_renewal_ops = &nfs41_state_renewal_ops,
6900 };
6901 #endif
6902
6903 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6904         [0] = &nfs_v4_0_minor_ops,
6905 #if defined(CONFIG_NFS_V4_1)
6906         [1] = &nfs_v4_1_minor_ops,
6907 #endif
6908 };
6909
6910 const struct inode_operations nfs4_dir_inode_operations = {
6911         .create         = nfs_create,
6912         .lookup         = nfs_lookup,
6913         .atomic_open    = nfs_atomic_open,
6914         .link           = nfs_link,
6915         .unlink         = nfs_unlink,
6916         .symlink        = nfs_symlink,
6917         .mkdir          = nfs_mkdir,
6918         .rmdir          = nfs_rmdir,
6919         .mknod          = nfs_mknod,
6920         .rename         = nfs_rename,
6921         .permission     = nfs_permission,
6922         .getattr        = nfs_getattr,
6923         .setattr        = nfs_setattr,
6924         .getxattr       = generic_getxattr,
6925         .setxattr       = generic_setxattr,
6926         .listxattr      = generic_listxattr,
6927         .removexattr    = generic_removexattr,
6928 };
6929
6930 static const struct inode_operations nfs4_file_inode_operations = {
6931         .permission     = nfs_permission,
6932         .getattr        = nfs_getattr,
6933         .setattr        = nfs_setattr,
6934         .getxattr       = generic_getxattr,
6935         .setxattr       = generic_setxattr,
6936         .listxattr      = generic_listxattr,
6937         .removexattr    = generic_removexattr,
6938 };
6939
6940 const struct nfs_rpc_ops nfs_v4_clientops = {
6941         .version        = 4,                    /* protocol version */
6942         .dentry_ops     = &nfs4_dentry_operations,
6943         .dir_inode_ops  = &nfs4_dir_inode_operations,
6944         .file_inode_ops = &nfs4_file_inode_operations,
6945         .file_ops       = &nfs4_file_operations,
6946         .getroot        = nfs4_proc_get_root,
6947         .submount       = nfs4_submount,
6948         .try_mount      = nfs4_try_mount,
6949         .getattr        = nfs4_proc_getattr,
6950         .setattr        = nfs4_proc_setattr,
6951         .lookup         = nfs4_proc_lookup,
6952         .access         = nfs4_proc_access,
6953         .readlink       = nfs4_proc_readlink,
6954         .create         = nfs4_proc_create,
6955         .remove         = nfs4_proc_remove,
6956         .unlink_setup   = nfs4_proc_unlink_setup,
6957         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6958         .unlink_done    = nfs4_proc_unlink_done,
6959         .rename         = nfs4_proc_rename,
6960         .rename_setup   = nfs4_proc_rename_setup,
6961         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6962         .rename_done    = nfs4_proc_rename_done,
6963         .link           = nfs4_proc_link,
6964         .symlink        = nfs4_proc_symlink,
6965         .mkdir          = nfs4_proc_mkdir,
6966         .rmdir          = nfs4_proc_remove,
6967         .readdir        = nfs4_proc_readdir,
6968         .mknod          = nfs4_proc_mknod,
6969         .statfs         = nfs4_proc_statfs,
6970         .fsinfo         = nfs4_proc_fsinfo,
6971         .pathconf       = nfs4_proc_pathconf,
6972         .set_capabilities = nfs4_server_capabilities,
6973         .decode_dirent  = nfs4_decode_dirent,
6974         .read_setup     = nfs4_proc_read_setup,
6975         .read_pageio_init = pnfs_pageio_init_read,
6976         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6977         .read_done      = nfs4_read_done,
6978         .write_setup    = nfs4_proc_write_setup,
6979         .write_pageio_init = pnfs_pageio_init_write,
6980         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6981         .write_done     = nfs4_write_done,
6982         .commit_setup   = nfs4_proc_commit_setup,
6983         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6984         .commit_done    = nfs4_commit_done,
6985         .lock           = nfs4_proc_lock,
6986         .clear_acl_cache = nfs4_zap_acl_attr,
6987         .close_context  = nfs4_close_context,
6988         .open_context   = nfs4_atomic_open,
6989         .have_delegation = nfs4_have_delegation,
6990         .return_delegation = nfs4_inode_return_delegation,
6991         .alloc_client   = nfs4_alloc_client,
6992         .init_client    = nfs4_init_client,
6993         .free_client    = nfs4_free_client,
6994         .create_server  = nfs4_create_server,
6995         .clone_server   = nfs_clone_server,
6996 };
6997
6998 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6999         .prefix = XATTR_NAME_NFSV4_ACL,
7000         .list   = nfs4_xattr_list_nfs4_acl,
7001         .get    = nfs4_xattr_get_nfs4_acl,
7002         .set    = nfs4_xattr_set_nfs4_acl,
7003 };
7004
7005 const struct xattr_handler *nfs4_xattr_handlers[] = {
7006         &nfs4_xattr_nfs4_acl_handler,
7007         NULL
7008 };
7009
7010 /*
7011  * Local variables:
7012  *  c-basic-offset: 8
7013  * End:
7014  */