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                     can_open_delegated(delegation, data->o_arg.fmode))
1547                         goto unlock_no_action;
1548                 rcu_read_unlock();
1549         }
1550         /* Update client id. */
1551         data->o_arg.clientid = clp->cl_clientid;
1552         switch (data->o_arg.claim) {
1553         case NFS4_OPEN_CLAIM_PREVIOUS:
1554         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1555         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1556                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1557         case NFS4_OPEN_CLAIM_FH:
1558                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1559                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1560         }
1561         data->timestamp = jiffies;
1562         if (nfs4_setup_sequence(data->o_arg.server,
1563                                 &data->o_arg.seq_args,
1564                                 &data->o_res.seq_res,
1565                                 task) != 0)
1566                 nfs_release_seqid(data->o_arg.seqid);
1567
1568         /* Set the create mode (note dependency on the session type) */
1569         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1570         if (data->o_arg.open_flags & O_EXCL) {
1571                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1572                 if (nfs4_has_persistent_session(clp))
1573                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1574                 else if (clp->cl_mvops->minor_version > 0)
1575                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1576         }
1577         return;
1578 unlock_no_action:
1579         rcu_read_unlock();
1580 out_no_action:
1581         task->tk_action = NULL;
1582 out_wait:
1583         nfs4_sequence_done(task, &data->o_res.seq_res);
1584 }
1585
1586 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1587 {
1588         struct nfs4_opendata *data = calldata;
1589
1590         data->rpc_status = task->tk_status;
1591
1592         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1593                 return;
1594
1595         if (task->tk_status == 0) {
1596                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1597                         switch (data->o_res.f_attr->mode & S_IFMT) {
1598                         case S_IFREG:
1599                                 break;
1600                         case S_IFLNK:
1601                                 data->rpc_status = -ELOOP;
1602                                 break;
1603                         case S_IFDIR:
1604                                 data->rpc_status = -EISDIR;
1605                                 break;
1606                         default:
1607                                 data->rpc_status = -ENOTDIR;
1608                         }
1609                 }
1610                 renew_lease(data->o_res.server, data->timestamp);
1611                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1612                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1613         }
1614         data->rpc_done = 1;
1615 }
1616
1617 static void nfs4_open_release(void *calldata)
1618 {
1619         struct nfs4_opendata *data = calldata;
1620         struct nfs4_state *state = NULL;
1621
1622         /* If this request hasn't been cancelled, do nothing */
1623         if (data->cancelled == 0)
1624                 goto out_free;
1625         /* In case of error, no cleanup! */
1626         if (data->rpc_status != 0 || !data->rpc_done)
1627                 goto out_free;
1628         /* In case we need an open_confirm, no cleanup! */
1629         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1630                 goto out_free;
1631         state = nfs4_opendata_to_nfs4_state(data);
1632         if (!IS_ERR(state))
1633                 nfs4_close_state(state, data->o_arg.fmode);
1634 out_free:
1635         nfs4_opendata_put(data);
1636 }
1637
1638 static const struct rpc_call_ops nfs4_open_ops = {
1639         .rpc_call_prepare = nfs4_open_prepare,
1640         .rpc_call_done = nfs4_open_done,
1641         .rpc_release = nfs4_open_release,
1642 };
1643
1644 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1645 {
1646         struct inode *dir = data->dir->d_inode;
1647         struct nfs_server *server = NFS_SERVER(dir);
1648         struct nfs_openargs *o_arg = &data->o_arg;
1649         struct nfs_openres *o_res = &data->o_res;
1650         struct rpc_task *task;
1651         struct rpc_message msg = {
1652                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1653                 .rpc_argp = o_arg,
1654                 .rpc_resp = o_res,
1655                 .rpc_cred = data->owner->so_cred,
1656         };
1657         struct rpc_task_setup task_setup_data = {
1658                 .rpc_client = server->client,
1659                 .rpc_message = &msg,
1660                 .callback_ops = &nfs4_open_ops,
1661                 .callback_data = data,
1662                 .workqueue = nfsiod_workqueue,
1663                 .flags = RPC_TASK_ASYNC,
1664         };
1665         int status;
1666
1667         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1668         kref_get(&data->kref);
1669         data->rpc_done = 0;
1670         data->rpc_status = 0;
1671         data->cancelled = 0;
1672         if (isrecover)
1673                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1674         task = rpc_run_task(&task_setup_data);
1675         if (IS_ERR(task))
1676                 return PTR_ERR(task);
1677         status = nfs4_wait_for_completion_rpc_task(task);
1678         if (status != 0) {
1679                 data->cancelled = 1;
1680                 smp_wmb();
1681         } else
1682                 status = data->rpc_status;
1683         rpc_put_task(task);
1684
1685         return status;
1686 }
1687
1688 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1689 {
1690         struct inode *dir = data->dir->d_inode;
1691         struct nfs_openres *o_res = &data->o_res;
1692         int status;
1693
1694         status = nfs4_run_open_task(data, 1);
1695         if (status != 0 || !data->rpc_done)
1696                 return status;
1697
1698         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1699
1700         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1701                 status = _nfs4_proc_open_confirm(data);
1702                 if (status != 0)
1703                         return status;
1704         }
1705
1706         return status;
1707 }
1708
1709 static int nfs4_opendata_access(struct rpc_cred *cred,
1710                                 struct nfs4_opendata *opendata,
1711                                 struct nfs4_state *state, fmode_t fmode,
1712                                 int openflags)
1713 {
1714         struct nfs_access_entry cache;
1715         u32 mask;
1716
1717         /* access call failed or for some reason the server doesn't
1718          * support any access modes -- defer access call until later */
1719         if (opendata->o_res.access_supported == 0)
1720                 return 0;
1721
1722         mask = 0;
1723         /* don't check MAY_WRITE - a newly created file may not have
1724          * write mode bits, but POSIX allows the creating process to write.
1725          * use openflags to check for exec, because fmode won't
1726          * always have FMODE_EXEC set when file open for exec. */
1727         if (openflags & __FMODE_EXEC) {
1728                 /* ONLY check for exec rights */
1729                 mask = MAY_EXEC;
1730         } else if (fmode & FMODE_READ)
1731                 mask = MAY_READ;
1732
1733         cache.cred = cred;
1734         cache.jiffies = jiffies;
1735         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1736         nfs_access_add_cache(state->inode, &cache);
1737
1738         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1739                 return 0;
1740
1741         /* even though OPEN succeeded, access is denied. Close the file */
1742         nfs4_close_state(state, fmode);
1743         return -EACCES;
1744 }
1745
1746 /*
1747  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1748  */
1749 static int _nfs4_proc_open(struct nfs4_opendata *data)
1750 {
1751         struct inode *dir = data->dir->d_inode;
1752         struct nfs_server *server = NFS_SERVER(dir);
1753         struct nfs_openargs *o_arg = &data->o_arg;
1754         struct nfs_openres *o_res = &data->o_res;
1755         int status;
1756
1757         status = nfs4_run_open_task(data, 0);
1758         if (!data->rpc_done)
1759                 return status;
1760         if (status != 0) {
1761                 if (status == -NFS4ERR_BADNAME &&
1762                                 !(o_arg->open_flags & O_CREAT))
1763                         return -ENOENT;
1764                 return status;
1765         }
1766
1767         nfs_fattr_map_and_free_names(server, &data->f_attr);
1768
1769         if (o_arg->open_flags & O_CREAT)
1770                 update_changeattr(dir, &o_res->cinfo);
1771         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1772                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1773         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1774                 status = _nfs4_proc_open_confirm(data);
1775                 if (status != 0)
1776                         return status;
1777         }
1778         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1779                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1780         return 0;
1781 }
1782
1783 static int nfs4_recover_expired_lease(struct nfs_server *server)
1784 {
1785         return nfs4_client_recover_expired_lease(server->nfs_client);
1786 }
1787
1788 /*
1789  * OPEN_EXPIRED:
1790  *      reclaim state on the server after a network partition.
1791  *      Assumes caller holds the appropriate lock
1792  */
1793 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1794 {
1795         struct nfs4_opendata *opendata;
1796         int ret;
1797
1798         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1799                         NFS4_OPEN_CLAIM_FH);
1800         if (IS_ERR(opendata))
1801                 return PTR_ERR(opendata);
1802         ret = nfs4_open_recover(opendata, state);
1803         if (ret == -ESTALE)
1804                 d_drop(ctx->dentry);
1805         nfs4_opendata_put(opendata);
1806         return ret;
1807 }
1808
1809 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1810 {
1811         struct nfs_server *server = NFS_SERVER(state->inode);
1812         struct nfs4_exception exception = { };
1813         int err;
1814
1815         do {
1816                 err = _nfs4_open_expired(ctx, state);
1817                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1818                         continue;
1819                 switch (err) {
1820                 default:
1821                         goto out;
1822                 case -NFS4ERR_GRACE:
1823                 case -NFS4ERR_DELAY:
1824                         nfs4_handle_exception(server, err, &exception);
1825                         err = 0;
1826                 }
1827         } while (exception.retry);
1828 out:
1829         return err;
1830 }
1831
1832 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1833 {
1834         struct nfs_open_context *ctx;
1835         int ret;
1836
1837         ctx = nfs4_state_find_open_context(state);
1838         if (IS_ERR(ctx))
1839                 return -EAGAIN;
1840         ret = nfs4_do_open_expired(ctx, state);
1841         put_nfs_open_context(ctx);
1842         return ret;
1843 }
1844
1845 #if defined(CONFIG_NFS_V4_1)
1846 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1847 {
1848         struct nfs_server *server = NFS_SERVER(state->inode);
1849         nfs4_stateid *stateid = &state->stateid;
1850         int status;
1851
1852         /* If a state reset has been done, test_stateid is unneeded */
1853         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1854                 return;
1855
1856         status = nfs41_test_stateid(server, stateid);
1857         if (status != NFS_OK) {
1858                 /* Free the stateid unless the server explicitly
1859                  * informs us the stateid is unrecognized. */
1860                 if (status != -NFS4ERR_BAD_STATEID)
1861                         nfs41_free_stateid(server, stateid);
1862                 nfs_remove_bad_delegation(state->inode);
1863
1864                 write_seqlock(&state->seqlock);
1865                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1866                 write_sequnlock(&state->seqlock);
1867                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1868         }
1869 }
1870
1871 /**
1872  * nfs41_check_open_stateid - possibly free an open stateid
1873  *
1874  * @state: NFSv4 state for an inode
1875  *
1876  * Returns NFS_OK if recovery for this stateid is now finished.
1877  * Otherwise a negative NFS4ERR value is returned.
1878  */
1879 static int nfs41_check_open_stateid(struct nfs4_state *state)
1880 {
1881         struct nfs_server *server = NFS_SERVER(state->inode);
1882         nfs4_stateid *stateid = &state->open_stateid;
1883         int status;
1884
1885         /* If a state reset has been done, test_stateid is unneeded */
1886         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1887             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1888             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1889                 return -NFS4ERR_BAD_STATEID;
1890
1891         status = nfs41_test_stateid(server, stateid);
1892         if (status != NFS_OK) {
1893                 /* Free the stateid unless the server explicitly
1894                  * informs us the stateid is unrecognized. */
1895                 if (status != -NFS4ERR_BAD_STATEID)
1896                         nfs41_free_stateid(server, stateid);
1897
1898                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1899                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1900                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1901                 clear_bit(NFS_OPEN_STATE, &state->flags);
1902         }
1903         return status;
1904 }
1905
1906 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1907 {
1908         int status;
1909
1910         nfs41_clear_delegation_stateid(state);
1911         status = nfs41_check_open_stateid(state);
1912         if (status != NFS_OK)
1913                 status = nfs4_open_expired(sp, state);
1914         return status;
1915 }
1916 #endif
1917
1918 /*
1919  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1920  * fields corresponding to attributes that were used to store the verifier.
1921  * Make sure we clobber those fields in the later setattr call
1922  */
1923 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1924 {
1925         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1926             !(sattr->ia_valid & ATTR_ATIME_SET))
1927                 sattr->ia_valid |= ATTR_ATIME;
1928
1929         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1930             !(sattr->ia_valid & ATTR_MTIME_SET))
1931                 sattr->ia_valid |= ATTR_MTIME;
1932 }
1933
1934 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1935                 fmode_t fmode,
1936                 int flags,
1937                 struct nfs4_state **res)
1938 {
1939         struct nfs4_state_owner *sp = opendata->owner;
1940         struct nfs_server *server = sp->so_server;
1941         struct nfs4_state *state;
1942         unsigned int seq;
1943         int ret;
1944
1945         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1946
1947         ret = _nfs4_proc_open(opendata);
1948         if (ret != 0)
1949                 goto out;
1950
1951         state = nfs4_opendata_to_nfs4_state(opendata);
1952         ret = PTR_ERR(state);
1953         if (IS_ERR(state))
1954                 goto out;
1955         if (server->caps & NFS_CAP_POSIX_LOCK)
1956                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1957
1958         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1959         if (ret != 0)
1960                 goto out;
1961
1962         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
1963                 nfs4_schedule_stateid_recovery(server, state);
1964         *res = state;
1965 out:
1966         return ret;
1967 }
1968
1969 /*
1970  * Returns a referenced nfs4_state
1971  */
1972 static int _nfs4_do_open(struct inode *dir,
1973                         struct dentry *dentry,
1974                         fmode_t fmode,
1975                         int flags,
1976                         struct iattr *sattr,
1977                         struct rpc_cred *cred,
1978                         struct nfs4_state **res,
1979                         struct nfs4_threshold **ctx_th)
1980 {
1981         struct nfs4_state_owner  *sp;
1982         struct nfs4_state     *state = NULL;
1983         struct nfs_server       *server = NFS_SERVER(dir);
1984         struct nfs4_opendata *opendata;
1985         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
1986         int status;
1987
1988         /* Protect against reboot recovery conflicts */
1989         status = -ENOMEM;
1990         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1991         if (sp == NULL) {
1992                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1993                 goto out_err;
1994         }
1995         status = nfs4_recover_expired_lease(server);
1996         if (status != 0)
1997                 goto err_put_state_owner;
1998         if (dentry->d_inode != NULL)
1999                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2000         status = -ENOMEM;
2001         if (dentry->d_inode)
2002                 claim = NFS4_OPEN_CLAIM_FH;
2003         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2004                         claim, GFP_KERNEL);
2005         if (opendata == NULL)
2006                 goto err_put_state_owner;
2007
2008         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2009                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2010                 if (!opendata->f_attr.mdsthreshold)
2011                         goto err_opendata_put;
2012                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2013         }
2014         if (dentry->d_inode != NULL)
2015                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2016
2017         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
2018         if (status != 0)
2019                 goto err_opendata_put;
2020
2021         if ((opendata->o_arg.open_flags & O_EXCL) &&
2022             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2023                 nfs4_exclusive_attrset(opendata, sattr);
2024
2025                 nfs_fattr_init(opendata->o_res.f_attr);
2026                 status = nfs4_do_setattr(state->inode, cred,
2027                                 opendata->o_res.f_attr, sattr,
2028                                 state);
2029                 if (status == 0)
2030                         nfs_setattr_update_inode(state->inode, sattr);
2031                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2032         }
2033
2034         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2035                 *ctx_th = opendata->f_attr.mdsthreshold;
2036         else
2037                 kfree(opendata->f_attr.mdsthreshold);
2038         opendata->f_attr.mdsthreshold = NULL;
2039
2040         nfs4_opendata_put(opendata);
2041         nfs4_put_state_owner(sp);
2042         *res = state;
2043         return 0;
2044 err_opendata_put:
2045         kfree(opendata->f_attr.mdsthreshold);
2046         nfs4_opendata_put(opendata);
2047 err_put_state_owner:
2048         nfs4_put_state_owner(sp);
2049 out_err:
2050         *res = NULL;
2051         return status;
2052 }
2053
2054
2055 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2056                                         struct dentry *dentry,
2057                                         fmode_t fmode,
2058                                         int flags,
2059                                         struct iattr *sattr,
2060                                         struct rpc_cred *cred,
2061                                         struct nfs4_threshold **ctx_th)
2062 {
2063         struct nfs_server *server = NFS_SERVER(dir);
2064         struct nfs4_exception exception = { };
2065         struct nfs4_state *res;
2066         int status;
2067
2068         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2069         do {
2070                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2071                                        &res, ctx_th);
2072                 if (status == 0)
2073                         break;
2074                 /* NOTE: BAD_SEQID means the server and client disagree about the
2075                  * book-keeping w.r.t. state-changing operations
2076                  * (OPEN/CLOSE/LOCK/LOCKU...)
2077                  * It is actually a sign of a bug on the client or on the server.
2078                  *
2079                  * If we receive a BAD_SEQID error in the particular case of
2080                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2081                  * have unhashed the old state_owner for us, and that we can
2082                  * therefore safely retry using a new one. We should still warn
2083                  * the user though...
2084                  */
2085                 if (status == -NFS4ERR_BAD_SEQID) {
2086                         pr_warn_ratelimited("NFS: v4 server %s "
2087                                         " returned a bad sequence-id error!\n",
2088                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2089                         exception.retry = 1;
2090                         continue;
2091                 }
2092                 /*
2093                  * BAD_STATEID on OPEN means that the server cancelled our
2094                  * state before it received the OPEN_CONFIRM.
2095                  * Recover by retrying the request as per the discussion
2096                  * on Page 181 of RFC3530.
2097                  */
2098                 if (status == -NFS4ERR_BAD_STATEID) {
2099                         exception.retry = 1;
2100                         continue;
2101                 }
2102                 if (status == -EAGAIN) {
2103                         /* We must have found a delegation */
2104                         exception.retry = 1;
2105                         continue;
2106                 }
2107                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2108                         continue;
2109                 res = ERR_PTR(nfs4_handle_exception(server,
2110                                         status, &exception));
2111         } while (exception.retry);
2112         return res;
2113 }
2114
2115 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2116                             struct nfs_fattr *fattr, struct iattr *sattr,
2117                             struct nfs4_state *state)
2118 {
2119         struct nfs_server *server = NFS_SERVER(inode);
2120         struct nfs_setattrargs  arg = {
2121                 .fh             = NFS_FH(inode),
2122                 .iap            = sattr,
2123                 .server         = server,
2124                 .bitmask = server->attr_bitmask,
2125         };
2126         struct nfs_setattrres  res = {
2127                 .fattr          = fattr,
2128                 .server         = server,
2129         };
2130         struct rpc_message msg = {
2131                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2132                 .rpc_argp       = &arg,
2133                 .rpc_resp       = &res,
2134                 .rpc_cred       = cred,
2135         };
2136         unsigned long timestamp = jiffies;
2137         int status;
2138
2139         nfs_fattr_init(fattr);
2140
2141         if (state != NULL && nfs4_valid_open_stateid(state)) {
2142                 struct nfs_lockowner lockowner = {
2143                         .l_owner = current->files,
2144                         .l_pid = current->tgid,
2145                 };
2146                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2147                                 &lockowner);
2148         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2149                                 FMODE_WRITE)) {
2150                 /* Use that stateid */
2151         } else
2152                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2153
2154         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2155         if (status == 0 && state != NULL)
2156                 renew_lease(server, timestamp);
2157         return status;
2158 }
2159
2160 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2161                            struct nfs_fattr *fattr, struct iattr *sattr,
2162                            struct nfs4_state *state)
2163 {
2164         struct nfs_server *server = NFS_SERVER(inode);
2165         struct nfs4_exception exception = {
2166                 .state = state,
2167                 .inode = inode,
2168         };
2169         int err;
2170         do {
2171                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2172                 switch (err) {
2173                 case -NFS4ERR_OPENMODE:
2174                         if (state && !(state->state & FMODE_WRITE)) {
2175                                 err = -EBADF;
2176                                 if (sattr->ia_valid & ATTR_OPEN)
2177                                         err = -EACCES;
2178                                 goto out;
2179                         }
2180                 }
2181                 err = nfs4_handle_exception(server, err, &exception);
2182         } while (exception.retry);
2183 out:
2184         return err;
2185 }
2186
2187 struct nfs4_closedata {
2188         struct inode *inode;
2189         struct nfs4_state *state;
2190         struct nfs_closeargs arg;
2191         struct nfs_closeres res;
2192         struct nfs_fattr fattr;
2193         unsigned long timestamp;
2194         bool roc;
2195         u32 roc_barrier;
2196 };
2197
2198 static void nfs4_free_closedata(void *data)
2199 {
2200         struct nfs4_closedata *calldata = data;
2201         struct nfs4_state_owner *sp = calldata->state->owner;
2202         struct super_block *sb = calldata->state->inode->i_sb;
2203
2204         if (calldata->roc)
2205                 pnfs_roc_release(calldata->state->inode);
2206         nfs4_put_open_state(calldata->state);
2207         nfs_free_seqid(calldata->arg.seqid);
2208         nfs4_put_state_owner(sp);
2209         nfs_sb_deactive(sb);
2210         kfree(calldata);
2211 }
2212
2213 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2214                 fmode_t fmode)
2215 {
2216         spin_lock(&state->owner->so_lock);
2217         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2218         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2219         case FMODE_WRITE:
2220                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2221                 break;
2222         case FMODE_READ:
2223                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2224                 break;
2225         case 0:
2226                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2227                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2228                 clear_bit(NFS_OPEN_STATE, &state->flags);
2229         }
2230         spin_unlock(&state->owner->so_lock);
2231 }
2232
2233 static void nfs4_close_done(struct rpc_task *task, void *data)
2234 {
2235         struct nfs4_closedata *calldata = data;
2236         struct nfs4_state *state = calldata->state;
2237         struct nfs_server *server = NFS_SERVER(calldata->inode);
2238
2239         dprintk("%s: begin!\n", __func__);
2240         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2241                 return;
2242         /* hmm. we are done with the inode, and in the process of freeing
2243          * the state_owner. we keep this around to process errors
2244          */
2245         switch (task->tk_status) {
2246                 case 0:
2247                         if (calldata->roc)
2248                                 pnfs_roc_set_barrier(state->inode,
2249                                                      calldata->roc_barrier);
2250                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2251                         renew_lease(server, calldata->timestamp);
2252                         nfs4_close_clear_stateid_flags(state,
2253                                         calldata->arg.fmode);
2254                         break;
2255                 case -NFS4ERR_STALE_STATEID:
2256                 case -NFS4ERR_OLD_STATEID:
2257                 case -NFS4ERR_BAD_STATEID:
2258                 case -NFS4ERR_EXPIRED:
2259                         if (calldata->arg.fmode == 0)
2260                                 break;
2261                 default:
2262                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2263                                 rpc_restart_call_prepare(task);
2264         }
2265         nfs_release_seqid(calldata->arg.seqid);
2266         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2267         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2268 }
2269
2270 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2271 {
2272         struct nfs4_closedata *calldata = data;
2273         struct nfs4_state *state = calldata->state;
2274         struct inode *inode = calldata->inode;
2275         int call_close = 0;
2276
2277         dprintk("%s: begin!\n", __func__);
2278         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2279                 goto out_wait;
2280
2281         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2282         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2283         spin_lock(&state->owner->so_lock);
2284         /* Calculate the change in open mode */
2285         if (state->n_rdwr == 0) {
2286                 if (state->n_rdonly == 0) {
2287                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2288                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2289                         calldata->arg.fmode &= ~FMODE_READ;
2290                 }
2291                 if (state->n_wronly == 0) {
2292                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2293                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2294                         calldata->arg.fmode &= ~FMODE_WRITE;
2295                 }
2296         }
2297         if (!nfs4_valid_open_stateid(state))
2298                 call_close = 0;
2299         spin_unlock(&state->owner->so_lock);
2300
2301         if (!call_close) {
2302                 /* Note: exit _without_ calling nfs4_close_done */
2303                 goto out_no_action;
2304         }
2305
2306         if (calldata->arg.fmode == 0) {
2307                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2308                 if (calldata->roc &&
2309                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2310                         nfs_release_seqid(calldata->arg.seqid);
2311                         goto out_wait;
2312                     }
2313         }
2314
2315         nfs_fattr_init(calldata->res.fattr);
2316         calldata->timestamp = jiffies;
2317         if (nfs4_setup_sequence(NFS_SERVER(inode),
2318                                 &calldata->arg.seq_args,
2319                                 &calldata->res.seq_res,
2320                                 task) != 0)
2321                 nfs_release_seqid(calldata->arg.seqid);
2322         dprintk("%s: done!\n", __func__);
2323         return;
2324 out_no_action:
2325         task->tk_action = NULL;
2326 out_wait:
2327         nfs4_sequence_done(task, &calldata->res.seq_res);
2328 }
2329
2330 static const struct rpc_call_ops nfs4_close_ops = {
2331         .rpc_call_prepare = nfs4_close_prepare,
2332         .rpc_call_done = nfs4_close_done,
2333         .rpc_release = nfs4_free_closedata,
2334 };
2335
2336 /*
2337  * It is possible for data to be read/written from a mem-mapped file
2338  * after the sys_close call (which hits the vfs layer as a flush).
2339  * This means that we can't safely call nfsv4 close on a file until
2340  * the inode is cleared. This in turn means that we are not good
2341  * NFSv4 citizens - we do not indicate to the server to update the file's
2342  * share state even when we are done with one of the three share
2343  * stateid's in the inode.
2344  *
2345  * NOTE: Caller must be holding the sp->so_owner semaphore!
2346  */
2347 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2348 {
2349         struct nfs_server *server = NFS_SERVER(state->inode);
2350         struct nfs4_closedata *calldata;
2351         struct nfs4_state_owner *sp = state->owner;
2352         struct rpc_task *task;
2353         struct rpc_message msg = {
2354                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2355                 .rpc_cred = state->owner->so_cred,
2356         };
2357         struct rpc_task_setup task_setup_data = {
2358                 .rpc_client = server->client,
2359                 .rpc_message = &msg,
2360                 .callback_ops = &nfs4_close_ops,
2361                 .workqueue = nfsiod_workqueue,
2362                 .flags = RPC_TASK_ASYNC,
2363         };
2364         int status = -ENOMEM;
2365
2366         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2367         if (calldata == NULL)
2368                 goto out;
2369         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2370         calldata->inode = state->inode;
2371         calldata->state = state;
2372         calldata->arg.fh = NFS_FH(state->inode);
2373         calldata->arg.stateid = &state->open_stateid;
2374         /* Serialization for the sequence id */
2375         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2376         if (calldata->arg.seqid == NULL)
2377                 goto out_free_calldata;
2378         calldata->arg.fmode = 0;
2379         calldata->arg.bitmask = server->cache_consistency_bitmask;
2380         calldata->res.fattr = &calldata->fattr;
2381         calldata->res.seqid = calldata->arg.seqid;
2382         calldata->res.server = server;
2383         calldata->roc = pnfs_roc(state->inode);
2384         nfs_sb_active(calldata->inode->i_sb);
2385
2386         msg.rpc_argp = &calldata->arg;
2387         msg.rpc_resp = &calldata->res;
2388         task_setup_data.callback_data = calldata;
2389         task = rpc_run_task(&task_setup_data);
2390         if (IS_ERR(task))
2391                 return PTR_ERR(task);
2392         status = 0;
2393         if (wait)
2394                 status = rpc_wait_for_completion_task(task);
2395         rpc_put_task(task);
2396         return status;
2397 out_free_calldata:
2398         kfree(calldata);
2399 out:
2400         nfs4_put_open_state(state);
2401         nfs4_put_state_owner(sp);
2402         return status;
2403 }
2404
2405 static struct inode *
2406 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2407 {
2408         struct nfs4_state *state;
2409
2410         /* Protect against concurrent sillydeletes */
2411         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2412                              ctx->cred, &ctx->mdsthreshold);
2413         if (IS_ERR(state))
2414                 return ERR_CAST(state);
2415         ctx->state = state;
2416         return igrab(state->inode);
2417 }
2418
2419 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2420 {
2421         if (ctx->state == NULL)
2422                 return;
2423         if (is_sync)
2424                 nfs4_close_sync(ctx->state, ctx->mode);
2425         else
2426                 nfs4_close_state(ctx->state, ctx->mode);
2427 }
2428
2429 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2430 {
2431         struct nfs4_server_caps_arg args = {
2432                 .fhandle = fhandle,
2433         };
2434         struct nfs4_server_caps_res res = {};
2435         struct rpc_message msg = {
2436                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2437                 .rpc_argp = &args,
2438                 .rpc_resp = &res,
2439         };
2440         int status;
2441
2442         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2443         if (status == 0) {
2444                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2445                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2446                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2447                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2448                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2449                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2450                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2451                         server->caps |= NFS_CAP_ACLS;
2452                 if (res.has_links != 0)
2453                         server->caps |= NFS_CAP_HARDLINKS;
2454                 if (res.has_symlinks != 0)
2455                         server->caps |= NFS_CAP_SYMLINKS;
2456                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2457                         server->caps |= NFS_CAP_FILEID;
2458                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2459                         server->caps |= NFS_CAP_MODE;
2460                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2461                         server->caps |= NFS_CAP_NLINK;
2462                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2463                         server->caps |= NFS_CAP_OWNER;
2464                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2465                         server->caps |= NFS_CAP_OWNER_GROUP;
2466                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2467                         server->caps |= NFS_CAP_ATIME;
2468                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2469                         server->caps |= NFS_CAP_CTIME;
2470                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2471                         server->caps |= NFS_CAP_MTIME;
2472
2473                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2474                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2475                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2476                 server->acl_bitmask = res.acl_bitmask;
2477                 server->fh_expire_type = res.fh_expire_type;
2478         }
2479
2480         return status;
2481 }
2482
2483 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2484 {
2485         struct nfs4_exception exception = { };
2486         int err;
2487         do {
2488                 err = nfs4_handle_exception(server,
2489                                 _nfs4_server_capabilities(server, fhandle),
2490                                 &exception);
2491         } while (exception.retry);
2492         return err;
2493 }
2494
2495 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2496                 struct nfs_fsinfo *info)
2497 {
2498         struct nfs4_lookup_root_arg args = {
2499                 .bitmask = nfs4_fattr_bitmap,
2500         };
2501         struct nfs4_lookup_res res = {
2502                 .server = server,
2503                 .fattr = info->fattr,
2504                 .fh = fhandle,
2505         };
2506         struct rpc_message msg = {
2507                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2508                 .rpc_argp = &args,
2509                 .rpc_resp = &res,
2510         };
2511
2512         nfs_fattr_init(info->fattr);
2513         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2514 }
2515
2516 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2517                 struct nfs_fsinfo *info)
2518 {
2519         struct nfs4_exception exception = { };
2520         int err;
2521         do {
2522                 err = _nfs4_lookup_root(server, fhandle, info);
2523                 switch (err) {
2524                 case 0:
2525                 case -NFS4ERR_WRONGSEC:
2526                         goto out;
2527                 default:
2528                         err = nfs4_handle_exception(server, err, &exception);
2529                 }
2530         } while (exception.retry);
2531 out:
2532         return err;
2533 }
2534
2535 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2536                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2537 {
2538         struct rpc_auth *auth;
2539         int ret;
2540
2541         auth = rpcauth_create(flavor, server->client);
2542         if (IS_ERR(auth)) {
2543                 ret = -EIO;
2544                 goto out;
2545         }
2546         ret = nfs4_lookup_root(server, fhandle, info);
2547 out:
2548         return ret;
2549 }
2550
2551 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2552                               struct nfs_fsinfo *info)
2553 {
2554         int i, len, status = 0;
2555         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2556
2557         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2558         if (len < 0)
2559                 return len;
2560
2561         for (i = 0; i < len; i++) {
2562                 /* AUTH_UNIX is the default flavor if none was specified,
2563                  * thus has already been tried. */
2564                 if (flav_array[i] == RPC_AUTH_UNIX)
2565                         continue;
2566
2567                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2568                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2569                         continue;
2570                 break;
2571         }
2572         /*
2573          * -EACCESS could mean that the user doesn't have correct permissions
2574          * to access the mount.  It could also mean that we tried to mount
2575          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2576          * existing mount programs don't handle -EACCES very well so it should
2577          * be mapped to -EPERM instead.
2578          */
2579         if (status == -EACCES)
2580                 status = -EPERM;
2581         return status;
2582 }
2583
2584 /*
2585  * get the file handle for the "/" directory on the server
2586  */
2587 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2588                          struct nfs_fsinfo *info)
2589 {
2590         int minor_version = server->nfs_client->cl_minorversion;
2591         int status = nfs4_lookup_root(server, fhandle, info);
2592         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2593                 /*
2594                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2595                  * by nfs4_map_errors() as this function exits.
2596                  */
2597                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2598         if (status == 0)
2599                 status = nfs4_server_capabilities(server, fhandle);
2600         if (status == 0)
2601                 status = nfs4_do_fsinfo(server, fhandle, info);
2602         return nfs4_map_errors(status);
2603 }
2604
2605 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2606                               struct nfs_fsinfo *info)
2607 {
2608         int error;
2609         struct nfs_fattr *fattr = info->fattr;
2610
2611         error = nfs4_server_capabilities(server, mntfh);
2612         if (error < 0) {
2613                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2614                 return error;
2615         }
2616
2617         error = nfs4_proc_getattr(server, mntfh, fattr);
2618         if (error < 0) {
2619                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2620                 return error;
2621         }
2622
2623         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2624             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2625                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2626
2627         return error;
2628 }
2629
2630 /*
2631  * Get locations and (maybe) other attributes of a referral.
2632  * Note that we'll actually follow the referral later when
2633  * we detect fsid mismatch in inode revalidation
2634  */
2635 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2636                              const struct qstr *name, struct nfs_fattr *fattr,
2637                              struct nfs_fh *fhandle)
2638 {
2639         int status = -ENOMEM;
2640         struct page *page = NULL;
2641         struct nfs4_fs_locations *locations = NULL;
2642
2643         page = alloc_page(GFP_KERNEL);
2644         if (page == NULL)
2645                 goto out;
2646         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2647         if (locations == NULL)
2648                 goto out;
2649
2650         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2651         if (status != 0)
2652                 goto out;
2653         /* Make sure server returned a different fsid for the referral */
2654         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2655                 dprintk("%s: server did not return a different fsid for"
2656                         " a referral at %s\n", __func__, name->name);
2657                 status = -EIO;
2658                 goto out;
2659         }
2660         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2661         nfs_fixup_referral_attributes(&locations->fattr);
2662
2663         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2664         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2665         memset(fhandle, 0, sizeof(struct nfs_fh));
2666 out:
2667         if (page)
2668                 __free_page(page);
2669         kfree(locations);
2670         return status;
2671 }
2672
2673 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2674 {
2675         struct nfs4_getattr_arg args = {
2676                 .fh = fhandle,
2677                 .bitmask = server->attr_bitmask,
2678         };
2679         struct nfs4_getattr_res res = {
2680                 .fattr = fattr,
2681                 .server = server,
2682         };
2683         struct rpc_message msg = {
2684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2685                 .rpc_argp = &args,
2686                 .rpc_resp = &res,
2687         };
2688
2689         nfs_fattr_init(fattr);
2690         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2691 }
2692
2693 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2694 {
2695         struct nfs4_exception exception = { };
2696         int err;
2697         do {
2698                 err = nfs4_handle_exception(server,
2699                                 _nfs4_proc_getattr(server, fhandle, fattr),
2700                                 &exception);
2701         } while (exception.retry);
2702         return err;
2703 }
2704
2705 /*
2706  * The file is not closed if it is opened due to the a request to change
2707  * the size of the file. The open call will not be needed once the
2708  * VFS layer lookup-intents are implemented.
2709  *
2710  * Close is called when the inode is destroyed.
2711  * If we haven't opened the file for O_WRONLY, we
2712  * need to in the size_change case to obtain a stateid.
2713  *
2714  * Got race?
2715  * Because OPEN is always done by name in nfsv4, it is
2716  * possible that we opened a different file by the same
2717  * name.  We can recognize this race condition, but we
2718  * can't do anything about it besides returning an error.
2719  *
2720  * This will be fixed with VFS changes (lookup-intent).
2721  */
2722 static int
2723 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2724                   struct iattr *sattr)
2725 {
2726         struct inode *inode = dentry->d_inode;
2727         struct rpc_cred *cred = NULL;
2728         struct nfs4_state *state = NULL;
2729         int status;
2730
2731         if (pnfs_ld_layoutret_on_setattr(inode))
2732                 pnfs_commit_and_return_layout(inode);
2733
2734         nfs_fattr_init(fattr);
2735
2736         /* Deal with open(O_TRUNC) */
2737         if (sattr->ia_valid & ATTR_OPEN)
2738                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2739
2740         /* Optimization: if the end result is no change, don't RPC */
2741         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2742                 return 0;
2743
2744         /* Search for an existing open(O_WRITE) file */
2745         if (sattr->ia_valid & ATTR_FILE) {
2746                 struct nfs_open_context *ctx;
2747
2748                 ctx = nfs_file_open_context(sattr->ia_file);
2749                 if (ctx) {
2750                         cred = ctx->cred;
2751                         state = ctx->state;
2752                 }
2753         }
2754
2755         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2756         if (status == 0)
2757                 nfs_setattr_update_inode(inode, sattr);
2758         return status;
2759 }
2760
2761 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2762                 const struct qstr *name, struct nfs_fh *fhandle,
2763                 struct nfs_fattr *fattr)
2764 {
2765         struct nfs_server *server = NFS_SERVER(dir);
2766         int                    status;
2767         struct nfs4_lookup_arg args = {
2768                 .bitmask = server->attr_bitmask,
2769                 .dir_fh = NFS_FH(dir),
2770                 .name = name,
2771         };
2772         struct nfs4_lookup_res res = {
2773                 .server = server,
2774                 .fattr = fattr,
2775                 .fh = fhandle,
2776         };
2777         struct rpc_message msg = {
2778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2779                 .rpc_argp = &args,
2780                 .rpc_resp = &res,
2781         };
2782
2783         nfs_fattr_init(fattr);
2784
2785         dprintk("NFS call  lookup %s\n", name->name);
2786         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2787         dprintk("NFS reply lookup: %d\n", status);
2788         return status;
2789 }
2790
2791 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2792 {
2793         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2794                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2795         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2796         fattr->nlink = 2;
2797 }
2798
2799 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2800                                    struct qstr *name, struct nfs_fh *fhandle,
2801                                    struct nfs_fattr *fattr)
2802 {
2803         struct nfs4_exception exception = { };
2804         struct rpc_clnt *client = *clnt;
2805         int err;
2806         do {
2807                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2808                 switch (err) {
2809                 case -NFS4ERR_BADNAME:
2810                         err = -ENOENT;
2811                         goto out;
2812                 case -NFS4ERR_MOVED:
2813                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2814                         goto out;
2815                 case -NFS4ERR_WRONGSEC:
2816                         err = -EPERM;
2817                         if (client != *clnt)
2818                                 goto out;
2819
2820                         client = nfs4_create_sec_client(client, dir, name);
2821                         if (IS_ERR(client))
2822                                 return PTR_ERR(client);
2823
2824                         exception.retry = 1;
2825                         break;
2826                 default:
2827                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2828                 }
2829         } while (exception.retry);
2830
2831 out:
2832         if (err == 0)
2833                 *clnt = client;
2834         else if (client != *clnt)
2835                 rpc_shutdown_client(client);
2836
2837         return err;
2838 }
2839
2840 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2841                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2842 {
2843         int status;
2844         struct rpc_clnt *client = NFS_CLIENT(dir);
2845
2846         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2847         if (client != NFS_CLIENT(dir)) {
2848                 rpc_shutdown_client(client);
2849                 nfs_fixup_secinfo_attributes(fattr);
2850         }
2851         return status;
2852 }
2853
2854 struct rpc_clnt *
2855 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2856                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2857 {
2858         int status;
2859         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2860
2861         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2862         if (status < 0) {
2863                 rpc_shutdown_client(client);
2864                 return ERR_PTR(status);
2865         }
2866         return client;
2867 }
2868
2869 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2870 {
2871         struct nfs_server *server = NFS_SERVER(inode);
2872         struct nfs4_accessargs args = {
2873                 .fh = NFS_FH(inode),
2874                 .bitmask = server->cache_consistency_bitmask,
2875         };
2876         struct nfs4_accessres res = {
2877                 .server = server,
2878         };
2879         struct rpc_message msg = {
2880                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2881                 .rpc_argp = &args,
2882                 .rpc_resp = &res,
2883                 .rpc_cred = entry->cred,
2884         };
2885         int mode = entry->mask;
2886         int status;
2887
2888         /*
2889          * Determine which access bits we want to ask for...
2890          */
2891         if (mode & MAY_READ)
2892                 args.access |= NFS4_ACCESS_READ;
2893         if (S_ISDIR(inode->i_mode)) {
2894                 if (mode & MAY_WRITE)
2895                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2896                 if (mode & MAY_EXEC)
2897                         args.access |= NFS4_ACCESS_LOOKUP;
2898         } else {
2899                 if (mode & MAY_WRITE)
2900                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2901                 if (mode & MAY_EXEC)
2902                         args.access |= NFS4_ACCESS_EXECUTE;
2903         }
2904
2905         res.fattr = nfs_alloc_fattr();
2906         if (res.fattr == NULL)
2907                 return -ENOMEM;
2908
2909         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2910         if (!status) {
2911                 nfs_access_set_mask(entry, res.access);
2912                 nfs_refresh_inode(inode, res.fattr);
2913         }
2914         nfs_free_fattr(res.fattr);
2915         return status;
2916 }
2917
2918 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2919 {
2920         struct nfs4_exception exception = { };
2921         int err;
2922         do {
2923                 err = nfs4_handle_exception(NFS_SERVER(inode),
2924                                 _nfs4_proc_access(inode, entry),
2925                                 &exception);
2926         } while (exception.retry);
2927         return err;
2928 }
2929
2930 /*
2931  * TODO: For the time being, we don't try to get any attributes
2932  * along with any of the zero-copy operations READ, READDIR,
2933  * READLINK, WRITE.
2934  *
2935  * In the case of the first three, we want to put the GETATTR
2936  * after the read-type operation -- this is because it is hard
2937  * to predict the length of a GETATTR response in v4, and thus
2938  * align the READ data correctly.  This means that the GETATTR
2939  * may end up partially falling into the page cache, and we should
2940  * shift it into the 'tail' of the xdr_buf before processing.
2941  * To do this efficiently, we need to know the total length
2942  * of data received, which doesn't seem to be available outside
2943  * of the RPC layer.
2944  *
2945  * In the case of WRITE, we also want to put the GETATTR after
2946  * the operation -- in this case because we want to make sure
2947  * we get the post-operation mtime and size.
2948  *
2949  * Both of these changes to the XDR layer would in fact be quite
2950  * minor, but I decided to leave them for a subsequent patch.
2951  */
2952 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2953                 unsigned int pgbase, unsigned int pglen)
2954 {
2955         struct nfs4_readlink args = {
2956                 .fh       = NFS_FH(inode),
2957                 .pgbase   = pgbase,
2958                 .pglen    = pglen,
2959                 .pages    = &page,
2960         };
2961         struct nfs4_readlink_res res;
2962         struct rpc_message msg = {
2963                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2964                 .rpc_argp = &args,
2965                 .rpc_resp = &res,
2966         };
2967
2968         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2969 }
2970
2971 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2972                 unsigned int pgbase, unsigned int pglen)
2973 {
2974         struct nfs4_exception exception = { };
2975         int err;
2976         do {
2977                 err = nfs4_handle_exception(NFS_SERVER(inode),
2978                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2979                                 &exception);
2980         } while (exception.retry);
2981         return err;
2982 }
2983
2984 /*
2985  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2986  */
2987 static int
2988 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2989                  int flags)
2990 {
2991         struct nfs_open_context *ctx;
2992         struct nfs4_state *state;
2993         int status = 0;
2994
2995         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2996         if (IS_ERR(ctx))
2997                 return PTR_ERR(ctx);
2998
2999         sattr->ia_mode &= ~current_umask();
3000         state = nfs4_do_open(dir, dentry, ctx->mode,
3001                         flags, sattr, ctx->cred,
3002                         &ctx->mdsthreshold);
3003         d_drop(dentry);
3004         if (IS_ERR(state)) {
3005                 status = PTR_ERR(state);
3006                 goto out;
3007         }
3008         d_add(dentry, igrab(state->inode));
3009         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
3010         ctx->state = state;
3011 out:
3012         put_nfs_open_context(ctx);
3013         return status;
3014 }
3015
3016 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3017 {
3018         struct nfs_server *server = NFS_SERVER(dir);
3019         struct nfs_removeargs args = {
3020                 .fh = NFS_FH(dir),
3021                 .name = *name,
3022         };
3023         struct nfs_removeres res = {
3024                 .server = server,
3025         };
3026         struct rpc_message msg = {
3027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3028                 .rpc_argp = &args,
3029                 .rpc_resp = &res,
3030         };
3031         int status;
3032
3033         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3034         if (status == 0)
3035                 update_changeattr(dir, &res.cinfo);
3036         return status;
3037 }
3038
3039 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3040 {
3041         struct nfs4_exception exception = { };
3042         int err;
3043         do {
3044                 err = nfs4_handle_exception(NFS_SERVER(dir),
3045                                 _nfs4_proc_remove(dir, name),
3046                                 &exception);
3047         } while (exception.retry);
3048         return err;
3049 }
3050
3051 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3052 {
3053         struct nfs_server *server = NFS_SERVER(dir);
3054         struct nfs_removeargs *args = msg->rpc_argp;
3055         struct nfs_removeres *res = msg->rpc_resp;
3056
3057         res->server = server;
3058         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3059         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3060 }
3061
3062 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3063 {
3064         nfs4_setup_sequence(NFS_SERVER(data->dir),
3065                         &data->args.seq_args,
3066                         &data->res.seq_res,
3067                         task);
3068 }
3069
3070 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3071 {
3072         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3073
3074         if (!nfs4_sequence_done(task, &res->seq_res))
3075                 return 0;
3076         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3077                 return 0;
3078         update_changeattr(dir, &res->cinfo);
3079         return 1;
3080 }
3081
3082 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3083 {
3084         struct nfs_server *server = NFS_SERVER(dir);
3085         struct nfs_renameargs *arg = msg->rpc_argp;
3086         struct nfs_renameres *res = msg->rpc_resp;
3087
3088         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3089         res->server = server;
3090         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3091 }
3092
3093 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3094 {
3095         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3096                         &data->args.seq_args,
3097                         &data->res.seq_res,
3098                         task);
3099 }
3100
3101 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3102                                  struct inode *new_dir)
3103 {
3104         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3105
3106         if (!nfs4_sequence_done(task, &res->seq_res))
3107                 return 0;
3108         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3109                 return 0;
3110
3111         update_changeattr(old_dir, &res->old_cinfo);
3112         update_changeattr(new_dir, &res->new_cinfo);
3113         return 1;
3114 }
3115
3116 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3117                 struct inode *new_dir, struct qstr *new_name)
3118 {
3119         struct nfs_server *server = NFS_SERVER(old_dir);
3120         struct nfs_renameargs arg = {
3121                 .old_dir = NFS_FH(old_dir),
3122                 .new_dir = NFS_FH(new_dir),
3123                 .old_name = old_name,
3124                 .new_name = new_name,
3125         };
3126         struct nfs_renameres res = {
3127                 .server = server,
3128         };
3129         struct rpc_message msg = {
3130                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3131                 .rpc_argp = &arg,
3132                 .rpc_resp = &res,
3133         };
3134         int status = -ENOMEM;
3135
3136         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3137         if (!status) {
3138                 update_changeattr(old_dir, &res.old_cinfo);
3139                 update_changeattr(new_dir, &res.new_cinfo);
3140         }
3141         return status;
3142 }
3143
3144 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3145                 struct inode *new_dir, struct qstr *new_name)
3146 {
3147         struct nfs4_exception exception = { };
3148         int err;
3149         do {
3150                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3151                                 _nfs4_proc_rename(old_dir, old_name,
3152                                         new_dir, new_name),
3153                                 &exception);
3154         } while (exception.retry);
3155         return err;
3156 }
3157
3158 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3159 {
3160         struct nfs_server *server = NFS_SERVER(inode);
3161         struct nfs4_link_arg arg = {
3162                 .fh     = NFS_FH(inode),
3163                 .dir_fh = NFS_FH(dir),
3164                 .name   = name,
3165                 .bitmask = server->attr_bitmask,
3166         };
3167         struct nfs4_link_res res = {
3168                 .server = server,
3169         };
3170         struct rpc_message msg = {
3171                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3172                 .rpc_argp = &arg,
3173                 .rpc_resp = &res,
3174         };
3175         int status = -ENOMEM;
3176
3177         res.fattr = nfs_alloc_fattr();
3178         if (res.fattr == NULL)
3179                 goto out;
3180
3181         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3182         if (!status) {
3183                 update_changeattr(dir, &res.cinfo);
3184                 nfs_post_op_update_inode(inode, res.fattr);
3185         }
3186 out:
3187         nfs_free_fattr(res.fattr);
3188         return status;
3189 }
3190
3191 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3192 {
3193         struct nfs4_exception exception = { };
3194         int err;
3195         do {
3196                 err = nfs4_handle_exception(NFS_SERVER(inode),
3197                                 _nfs4_proc_link(inode, dir, name),
3198                                 &exception);
3199         } while (exception.retry);
3200         return err;
3201 }
3202
3203 struct nfs4_createdata {
3204         struct rpc_message msg;
3205         struct nfs4_create_arg arg;
3206         struct nfs4_create_res res;
3207         struct nfs_fh fh;
3208         struct nfs_fattr fattr;
3209 };
3210
3211 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3212                 struct qstr *name, struct iattr *sattr, u32 ftype)
3213 {
3214         struct nfs4_createdata *data;
3215
3216         data = kzalloc(sizeof(*data), GFP_KERNEL);
3217         if (data != NULL) {
3218                 struct nfs_server *server = NFS_SERVER(dir);
3219
3220                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3221                 data->msg.rpc_argp = &data->arg;
3222                 data->msg.rpc_resp = &data->res;
3223                 data->arg.dir_fh = NFS_FH(dir);
3224                 data->arg.server = server;
3225                 data->arg.name = name;
3226                 data->arg.attrs = sattr;
3227                 data->arg.ftype = ftype;
3228                 data->arg.bitmask = server->attr_bitmask;
3229                 data->res.server = server;
3230                 data->res.fh = &data->fh;
3231                 data->res.fattr = &data->fattr;
3232                 nfs_fattr_init(data->res.fattr);
3233         }
3234         return data;
3235 }
3236
3237 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3238 {
3239         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3240                                     &data->arg.seq_args, &data->res.seq_res, 1);
3241         if (status == 0) {
3242                 update_changeattr(dir, &data->res.dir_cinfo);
3243                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3244         }
3245         return status;
3246 }
3247
3248 static void nfs4_free_createdata(struct nfs4_createdata *data)
3249 {
3250         kfree(data);
3251 }
3252
3253 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3254                 struct page *page, unsigned int len, struct iattr *sattr)
3255 {
3256         struct nfs4_createdata *data;
3257         int status = -ENAMETOOLONG;
3258
3259         if (len > NFS4_MAXPATHLEN)
3260                 goto out;
3261
3262         status = -ENOMEM;
3263         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3264         if (data == NULL)
3265                 goto out;
3266
3267         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3268         data->arg.u.symlink.pages = &page;
3269         data->arg.u.symlink.len = len;
3270
3271         status = nfs4_do_create(dir, dentry, data);
3272
3273         nfs4_free_createdata(data);
3274 out:
3275         return status;
3276 }
3277
3278 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3279                 struct page *page, unsigned int len, struct iattr *sattr)
3280 {
3281         struct nfs4_exception exception = { };
3282         int err;
3283         do {
3284                 err = nfs4_handle_exception(NFS_SERVER(dir),
3285                                 _nfs4_proc_symlink(dir, dentry, page,
3286                                                         len, sattr),
3287                                 &exception);
3288         } while (exception.retry);
3289         return err;
3290 }
3291
3292 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3293                 struct iattr *sattr)
3294 {
3295         struct nfs4_createdata *data;
3296         int status = -ENOMEM;
3297
3298         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3299         if (data == NULL)
3300                 goto out;
3301
3302         status = nfs4_do_create(dir, dentry, data);
3303
3304         nfs4_free_createdata(data);
3305 out:
3306         return status;
3307 }
3308
3309 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3310                 struct iattr *sattr)
3311 {
3312         struct nfs4_exception exception = { };
3313         int err;
3314
3315         sattr->ia_mode &= ~current_umask();
3316         do {
3317                 err = nfs4_handle_exception(NFS_SERVER(dir),
3318                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3319                                 &exception);
3320         } while (exception.retry);
3321         return err;
3322 }
3323
3324 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3325                 u64 cookie, struct page **pages, unsigned int count, int plus)
3326 {
3327         struct inode            *dir = dentry->d_inode;
3328         struct nfs4_readdir_arg args = {
3329                 .fh = NFS_FH(dir),
3330                 .pages = pages,
3331                 .pgbase = 0,
3332                 .count = count,
3333                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3334                 .plus = plus,
3335         };
3336         struct nfs4_readdir_res res;
3337         struct rpc_message msg = {
3338                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3339                 .rpc_argp = &args,
3340                 .rpc_resp = &res,
3341                 .rpc_cred = cred,
3342         };
3343         int                     status;
3344
3345         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3346                         dentry->d_parent->d_name.name,
3347                         dentry->d_name.name,
3348                         (unsigned long long)cookie);
3349         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3350         res.pgbase = args.pgbase;
3351         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3352         if (status >= 0) {
3353                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3354                 status += args.pgbase;
3355         }
3356
3357         nfs_invalidate_atime(dir);
3358
3359         dprintk("%s: returns %d\n", __func__, status);
3360         return status;
3361 }
3362
3363 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3364                 u64 cookie, struct page **pages, unsigned int count, int plus)
3365 {
3366         struct nfs4_exception exception = { };
3367         int err;
3368         do {
3369                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3370                                 _nfs4_proc_readdir(dentry, cred, cookie,
3371                                         pages, count, plus),
3372                                 &exception);
3373         } while (exception.retry);
3374         return err;
3375 }
3376
3377 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3378                 struct iattr *sattr, dev_t rdev)
3379 {
3380         struct nfs4_createdata *data;
3381         int mode = sattr->ia_mode;
3382         int status = -ENOMEM;
3383
3384         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3385         if (data == NULL)
3386                 goto out;
3387
3388         if (S_ISFIFO(mode))
3389                 data->arg.ftype = NF4FIFO;
3390         else if (S_ISBLK(mode)) {
3391                 data->arg.ftype = NF4BLK;
3392                 data->arg.u.device.specdata1 = MAJOR(rdev);
3393                 data->arg.u.device.specdata2 = MINOR(rdev);
3394         }
3395         else if (S_ISCHR(mode)) {
3396                 data->arg.ftype = NF4CHR;
3397                 data->arg.u.device.specdata1 = MAJOR(rdev);
3398                 data->arg.u.device.specdata2 = MINOR(rdev);
3399         } else if (!S_ISSOCK(mode)) {
3400                 status = -EINVAL;
3401                 goto out_free;
3402         }
3403
3404         status = nfs4_do_create(dir, dentry, data);
3405 out_free:
3406         nfs4_free_createdata(data);
3407 out:
3408         return status;
3409 }
3410
3411 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3412                 struct iattr *sattr, dev_t rdev)
3413 {
3414         struct nfs4_exception exception = { };
3415         int err;
3416
3417         sattr->ia_mode &= ~current_umask();
3418         do {
3419                 err = nfs4_handle_exception(NFS_SERVER(dir),
3420                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3421                                 &exception);
3422         } while (exception.retry);
3423         return err;
3424 }
3425
3426 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3427                  struct nfs_fsstat *fsstat)
3428 {
3429         struct nfs4_statfs_arg args = {
3430                 .fh = fhandle,
3431                 .bitmask = server->attr_bitmask,
3432         };
3433         struct nfs4_statfs_res res = {
3434                 .fsstat = fsstat,
3435         };
3436         struct rpc_message msg = {
3437                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3438                 .rpc_argp = &args,
3439                 .rpc_resp = &res,
3440         };
3441
3442         nfs_fattr_init(fsstat->fattr);
3443         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3444 }
3445
3446 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3447 {
3448         struct nfs4_exception exception = { };
3449         int err;
3450         do {
3451                 err = nfs4_handle_exception(server,
3452                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3453                                 &exception);
3454         } while (exception.retry);
3455         return err;
3456 }
3457
3458 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3459                 struct nfs_fsinfo *fsinfo)
3460 {
3461         struct nfs4_fsinfo_arg args = {
3462                 .fh = fhandle,
3463                 .bitmask = server->attr_bitmask,
3464         };
3465         struct nfs4_fsinfo_res res = {
3466                 .fsinfo = fsinfo,
3467         };
3468         struct rpc_message msg = {
3469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3470                 .rpc_argp = &args,
3471                 .rpc_resp = &res,
3472         };
3473
3474         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3475 }
3476
3477 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3478 {
3479         struct nfs4_exception exception = { };
3480         int err;
3481
3482         do {
3483                 err = nfs4_handle_exception(server,
3484                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3485                                 &exception);
3486         } while (exception.retry);
3487         return err;
3488 }
3489
3490 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3491 {
3492         int error;
3493
3494         nfs_fattr_init(fsinfo->fattr);
3495         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3496         if (error == 0) {
3497                 /* block layout checks this! */
3498                 server->pnfs_blksize = fsinfo->blksize;
3499                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3500         }
3501
3502         return error;
3503 }
3504
3505 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3506                 struct nfs_pathconf *pathconf)
3507 {
3508         struct nfs4_pathconf_arg args = {
3509                 .fh = fhandle,
3510                 .bitmask = server->attr_bitmask,
3511         };
3512         struct nfs4_pathconf_res res = {
3513                 .pathconf = pathconf,
3514         };
3515         struct rpc_message msg = {
3516                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3517                 .rpc_argp = &args,
3518                 .rpc_resp = &res,
3519         };
3520
3521         /* None of the pathconf attributes are mandatory to implement */
3522         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3523                 memset(pathconf, 0, sizeof(*pathconf));
3524                 return 0;
3525         }
3526
3527         nfs_fattr_init(pathconf->fattr);
3528         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3529 }
3530
3531 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3532                 struct nfs_pathconf *pathconf)
3533 {
3534         struct nfs4_exception exception = { };
3535         int err;
3536
3537         do {
3538                 err = nfs4_handle_exception(server,
3539                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3540                                 &exception);
3541         } while (exception.retry);
3542         return err;
3543 }
3544
3545 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3546                 const struct nfs_open_context *ctx,
3547                 const struct nfs_lock_context *l_ctx,
3548                 fmode_t fmode)
3549 {
3550         const struct nfs_lockowner *lockowner = NULL;
3551
3552         if (l_ctx != NULL)
3553                 lockowner = &l_ctx->lockowner;
3554         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3555 }
3556 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3557
3558 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3559                 const struct nfs_open_context *ctx,
3560                 const struct nfs_lock_context *l_ctx,
3561                 fmode_t fmode)
3562 {
3563         nfs4_stateid current_stateid;
3564
3565         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3566                 return false;
3567         return nfs4_stateid_match(stateid, &current_stateid);
3568 }
3569
3570 static bool nfs4_error_stateid_expired(int err)
3571 {
3572         switch (err) {
3573         case -NFS4ERR_DELEG_REVOKED:
3574         case -NFS4ERR_ADMIN_REVOKED:
3575         case -NFS4ERR_BAD_STATEID:
3576         case -NFS4ERR_STALE_STATEID:
3577         case -NFS4ERR_OLD_STATEID:
3578         case -NFS4ERR_OPENMODE:
3579         case -NFS4ERR_EXPIRED:
3580                 return true;
3581         }
3582         return false;
3583 }
3584
3585 void __nfs4_read_done_cb(struct nfs_read_data *data)
3586 {
3587         nfs_invalidate_atime(data->header->inode);
3588 }
3589
3590 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3591 {
3592         struct nfs_server *server = NFS_SERVER(data->header->inode);
3593
3594         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3595                 rpc_restart_call_prepare(task);
3596                 return -EAGAIN;
3597         }
3598
3599         __nfs4_read_done_cb(data);
3600         if (task->tk_status > 0)
3601                 renew_lease(server, data->timestamp);
3602         return 0;
3603 }
3604
3605 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3606                 struct nfs_readargs *args)
3607 {
3608
3609         if (!nfs4_error_stateid_expired(task->tk_status) ||
3610                 nfs4_stateid_is_current(&args->stateid,
3611                                 args->context,
3612                                 args->lock_context,
3613                                 FMODE_READ))
3614                 return false;
3615         rpc_restart_call_prepare(task);
3616         return true;
3617 }
3618
3619 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3620 {
3621
3622         dprintk("--> %s\n", __func__);
3623
3624         if (!nfs4_sequence_done(task, &data->res.seq_res))
3625                 return -EAGAIN;
3626         if (nfs4_read_stateid_changed(task, &data->args))
3627                 return -EAGAIN;
3628         return data->read_done_cb ? data->read_done_cb(task, data) :
3629                                     nfs4_read_done_cb(task, data);
3630 }
3631
3632 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3633 {
3634         data->timestamp   = jiffies;
3635         data->read_done_cb = nfs4_read_done_cb;
3636         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3637         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3638 }
3639
3640 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3641 {
3642         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3643                         &data->args.seq_args,
3644                         &data->res.seq_res,
3645                         task))
3646                 return;
3647         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3648                         data->args.lock_context, FMODE_READ);
3649 }
3650
3651 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3652 {
3653         struct inode *inode = data->header->inode;
3654
3655         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3656                 rpc_restart_call_prepare(task);
3657                 return -EAGAIN;
3658         }
3659         if (task->tk_status >= 0) {
3660                 renew_lease(NFS_SERVER(inode), data->timestamp);
3661                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3662         }
3663         return 0;
3664 }
3665
3666 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3667                 struct nfs_writeargs *args)
3668 {
3669
3670         if (!nfs4_error_stateid_expired(task->tk_status) ||
3671                 nfs4_stateid_is_current(&args->stateid,
3672                                 args->context,
3673                                 args->lock_context,
3674                                 FMODE_WRITE))
3675                 return false;
3676         rpc_restart_call_prepare(task);
3677         return true;
3678 }
3679
3680 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3681 {
3682         if (!nfs4_sequence_done(task, &data->res.seq_res))
3683                 return -EAGAIN;
3684         if (nfs4_write_stateid_changed(task, &data->args))
3685                 return -EAGAIN;
3686         return data->write_done_cb ? data->write_done_cb(task, data) :
3687                 nfs4_write_done_cb(task, data);
3688 }
3689
3690 static
3691 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3692 {
3693         const struct nfs_pgio_header *hdr = data->header;
3694
3695         /* Don't request attributes for pNFS or O_DIRECT writes */
3696         if (data->ds_clp != NULL || hdr->dreq != NULL)
3697                 return false;
3698         /* Otherwise, request attributes if and only if we don't hold
3699          * a delegation
3700          */
3701         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3702 }
3703
3704 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3705 {
3706         struct nfs_server *server = NFS_SERVER(data->header->inode);
3707
3708         if (!nfs4_write_need_cache_consistency_data(data)) {
3709                 data->args.bitmask = NULL;
3710                 data->res.fattr = NULL;
3711         } else
3712                 data->args.bitmask = server->cache_consistency_bitmask;
3713
3714         if (!data->write_done_cb)
3715                 data->write_done_cb = nfs4_write_done_cb;
3716         data->res.server = server;
3717         data->timestamp   = jiffies;
3718
3719         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3720         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3721 }
3722
3723 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3724 {
3725         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3726                         &data->args.seq_args,
3727                         &data->res.seq_res,
3728                         task))
3729                 return;
3730         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3731                         data->args.lock_context, FMODE_WRITE);
3732 }
3733
3734 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3735 {
3736         nfs4_setup_sequence(NFS_SERVER(data->inode),
3737                         &data->args.seq_args,
3738                         &data->res.seq_res,
3739                         task);
3740 }
3741
3742 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3743 {
3744         struct inode *inode = data->inode;
3745
3746         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3747                 rpc_restart_call_prepare(task);
3748                 return -EAGAIN;
3749         }
3750         return 0;
3751 }
3752
3753 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3754 {
3755         if (!nfs4_sequence_done(task, &data->res.seq_res))
3756                 return -EAGAIN;
3757         return data->commit_done_cb(task, data);
3758 }
3759
3760 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3761 {
3762         struct nfs_server *server = NFS_SERVER(data->inode);
3763
3764         if (data->commit_done_cb == NULL)
3765                 data->commit_done_cb = nfs4_commit_done_cb;
3766         data->res.server = server;
3767         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3768         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3769 }
3770
3771 struct nfs4_renewdata {
3772         struct nfs_client       *client;
3773         unsigned long           timestamp;
3774 };
3775
3776 /*
3777  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3778  * standalone procedure for queueing an asynchronous RENEW.
3779  */
3780 static void nfs4_renew_release(void *calldata)
3781 {
3782         struct nfs4_renewdata *data = calldata;
3783         struct nfs_client *clp = data->client;
3784
3785         if (atomic_read(&clp->cl_count) > 1)
3786                 nfs4_schedule_state_renewal(clp);
3787         nfs_put_client(clp);
3788         kfree(data);
3789 }
3790
3791 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3792 {
3793         struct nfs4_renewdata *data = calldata;
3794         struct nfs_client *clp = data->client;
3795         unsigned long timestamp = data->timestamp;
3796
3797         if (task->tk_status < 0) {
3798                 /* Unless we're shutting down, schedule state recovery! */
3799                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3800                         return;
3801                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3802                         nfs4_schedule_lease_recovery(clp);
3803                         return;
3804                 }
3805                 nfs4_schedule_path_down_recovery(clp);
3806         }
3807         do_renew_lease(clp, timestamp);
3808 }
3809
3810 static const struct rpc_call_ops nfs4_renew_ops = {
3811         .rpc_call_done = nfs4_renew_done,
3812         .rpc_release = nfs4_renew_release,
3813 };
3814
3815 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3816 {
3817         struct rpc_message msg = {
3818                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3819                 .rpc_argp       = clp,
3820                 .rpc_cred       = cred,
3821         };
3822         struct nfs4_renewdata *data;
3823
3824         if (renew_flags == 0)
3825                 return 0;
3826         if (!atomic_inc_not_zero(&clp->cl_count))
3827                 return -EIO;
3828         data = kmalloc(sizeof(*data), GFP_NOFS);
3829         if (data == NULL)
3830                 return -ENOMEM;
3831         data->client = clp;
3832         data->timestamp = jiffies;
3833         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
3834                         &nfs4_renew_ops, data);
3835 }
3836
3837 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3838 {
3839         struct rpc_message msg = {
3840                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3841                 .rpc_argp       = clp,
3842                 .rpc_cred       = cred,
3843         };
3844         unsigned long now = jiffies;
3845         int status;
3846
3847         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3848         if (status < 0)
3849                 return status;
3850         do_renew_lease(clp, now);
3851         return 0;
3852 }
3853
3854 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3855 {
3856         return (server->caps & NFS_CAP_ACLS)
3857                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3858                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3859 }
3860
3861 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3862  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3863  * the stack.
3864  */
3865 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3866
3867 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3868                 struct page **pages, unsigned int *pgbase)
3869 {
3870         struct page *newpage, **spages;
3871         int rc = 0;
3872         size_t len;
3873         spages = pages;
3874
3875         do {
3876                 len = min_t(size_t, PAGE_SIZE, buflen);
3877                 newpage = alloc_page(GFP_KERNEL);
3878
3879                 if (newpage == NULL)
3880                         goto unwind;
3881                 memcpy(page_address(newpage), buf, len);
3882                 buf += len;
3883                 buflen -= len;
3884                 *pages++ = newpage;
3885                 rc++;
3886         } while (buflen != 0);
3887
3888         return rc;
3889
3890 unwind:
3891         for(; rc > 0; rc--)
3892                 __free_page(spages[rc-1]);
3893         return -ENOMEM;
3894 }
3895
3896 struct nfs4_cached_acl {
3897         int cached;
3898         size_t len;
3899         char data[0];
3900 };
3901
3902 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3903 {
3904         struct nfs_inode *nfsi = NFS_I(inode);
3905
3906         spin_lock(&inode->i_lock);
3907         kfree(nfsi->nfs4_acl);
3908         nfsi->nfs4_acl = acl;
3909         spin_unlock(&inode->i_lock);
3910 }
3911
3912 static void nfs4_zap_acl_attr(struct inode *inode)
3913 {
3914         nfs4_set_cached_acl(inode, NULL);
3915 }
3916
3917 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3918 {
3919         struct nfs_inode *nfsi = NFS_I(inode);
3920         struct nfs4_cached_acl *acl;
3921         int ret = -ENOENT;
3922
3923         spin_lock(&inode->i_lock);
3924         acl = nfsi->nfs4_acl;
3925         if (acl == NULL)
3926                 goto out;
3927         if (buf == NULL) /* user is just asking for length */
3928                 goto out_len;
3929         if (acl->cached == 0)
3930                 goto out;
3931         ret = -ERANGE; /* see getxattr(2) man page */
3932         if (acl->len > buflen)
3933                 goto out;
3934         memcpy(buf, acl->data, acl->len);
3935 out_len:
3936         ret = acl->len;
3937 out:
3938         spin_unlock(&inode->i_lock);
3939         return ret;
3940 }
3941
3942 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3943 {
3944         struct nfs4_cached_acl *acl;
3945         size_t buflen = sizeof(*acl) + acl_len;
3946
3947         if (buflen <= PAGE_SIZE) {
3948                 acl = kmalloc(buflen, GFP_KERNEL);
3949                 if (acl == NULL)
3950                         goto out;
3951                 acl->cached = 1;
3952                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3953         } else {
3954                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3955                 if (acl == NULL)
3956                         goto out;
3957                 acl->cached = 0;
3958         }
3959         acl->len = acl_len;
3960 out:
3961         nfs4_set_cached_acl(inode, acl);
3962 }
3963
3964 /*
3965  * The getxattr API returns the required buffer length when called with a
3966  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3967  * the required buf.  On a NULL buf, we send a page of data to the server
3968  * guessing that the ACL request can be serviced by a page. If so, we cache
3969  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3970  * the cache. If not so, we throw away the page, and cache the required
3971  * length. The next getxattr call will then produce another round trip to
3972  * the server, this time with the input buf of the required size.
3973  */
3974 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3975 {
3976         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3977         struct nfs_getaclargs args = {
3978                 .fh = NFS_FH(inode),
3979                 .acl_pages = pages,
3980                 .acl_len = buflen,
3981         };
3982         struct nfs_getaclres res = {
3983                 .acl_len = buflen,
3984         };
3985         struct rpc_message msg = {
3986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3987                 .rpc_argp = &args,
3988                 .rpc_resp = &res,
3989         };
3990         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3991         int ret = -ENOMEM, i;
3992
3993         /* As long as we're doing a round trip to the server anyway,
3994          * let's be prepared for a page of acl data. */
3995         if (npages == 0)
3996                 npages = 1;
3997         if (npages > ARRAY_SIZE(pages))
3998                 return -ERANGE;
3999
4000         for (i = 0; i < npages; i++) {
4001                 pages[i] = alloc_page(GFP_KERNEL);
4002                 if (!pages[i])
4003                         goto out_free;
4004         }
4005
4006         /* for decoding across pages */
4007         res.acl_scratch = alloc_page(GFP_KERNEL);
4008         if (!res.acl_scratch)
4009                 goto out_free;
4010
4011         args.acl_len = npages * PAGE_SIZE;
4012         args.acl_pgbase = 0;
4013
4014         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4015                 __func__, buf, buflen, npages, args.acl_len);
4016         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4017                              &msg, &args.seq_args, &res.seq_res, 0);
4018         if (ret)
4019                 goto out_free;
4020
4021         /* Handle the case where the passed-in buffer is too short */
4022         if (res.acl_flags & NFS4_ACL_TRUNC) {
4023                 /* Did the user only issue a request for the acl length? */
4024                 if (buf == NULL)
4025                         goto out_ok;
4026                 ret = -ERANGE;
4027                 goto out_free;
4028         }
4029         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4030         if (buf) {
4031                 if (res.acl_len > buflen) {
4032                         ret = -ERANGE;
4033                         goto out_free;
4034                 }
4035                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4036         }
4037 out_ok:
4038         ret = res.acl_len;
4039 out_free:
4040         for (i = 0; i < npages; i++)
4041                 if (pages[i])
4042                         __free_page(pages[i]);
4043         if (res.acl_scratch)
4044                 __free_page(res.acl_scratch);
4045         return ret;
4046 }
4047
4048 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4049 {
4050         struct nfs4_exception exception = { };
4051         ssize_t ret;
4052         do {
4053                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4054                 if (ret >= 0)
4055                         break;
4056                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4057         } while (exception.retry);
4058         return ret;
4059 }
4060
4061 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4062 {
4063         struct nfs_server *server = NFS_SERVER(inode);
4064         int ret;
4065
4066         if (!nfs4_server_supports_acls(server))
4067                 return -EOPNOTSUPP;
4068         ret = nfs_revalidate_inode(server, inode);
4069         if (ret < 0)
4070                 return ret;
4071         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4072                 nfs_zap_acl_cache(inode);
4073         ret = nfs4_read_cached_acl(inode, buf, buflen);
4074         if (ret != -ENOENT)
4075                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4076                  * but no cached acl data, just the acl length */
4077                 return ret;
4078         return nfs4_get_acl_uncached(inode, buf, buflen);
4079 }
4080
4081 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4082 {
4083         struct nfs_server *server = NFS_SERVER(inode);
4084         struct page *pages[NFS4ACL_MAXPAGES];
4085         struct nfs_setaclargs arg = {
4086                 .fh             = NFS_FH(inode),
4087                 .acl_pages      = pages,
4088                 .acl_len        = buflen,
4089         };
4090         struct nfs_setaclres res;
4091         struct rpc_message msg = {
4092                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4093                 .rpc_argp       = &arg,
4094                 .rpc_resp       = &res,
4095         };
4096         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4097         int ret, i;
4098
4099         if (!nfs4_server_supports_acls(server))
4100                 return -EOPNOTSUPP;
4101         if (npages > ARRAY_SIZE(pages))
4102                 return -ERANGE;
4103         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4104         if (i < 0)
4105                 return i;
4106         nfs4_inode_return_delegation(inode);
4107         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4108
4109         /*
4110          * Free each page after tx, so the only ref left is
4111          * held by the network stack
4112          */
4113         for (; i > 0; i--)
4114                 put_page(pages[i-1]);
4115
4116         /*
4117          * Acl update can result in inode attribute update.
4118          * so mark the attribute cache invalid.
4119          */
4120         spin_lock(&inode->i_lock);
4121         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4122         spin_unlock(&inode->i_lock);
4123         nfs_access_zap_cache(inode);
4124         nfs_zap_acl_cache(inode);
4125         return ret;
4126 }
4127
4128 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4129 {
4130         struct nfs4_exception exception = { };
4131         int err;
4132         do {
4133                 err = nfs4_handle_exception(NFS_SERVER(inode),
4134                                 __nfs4_proc_set_acl(inode, buf, buflen),
4135                                 &exception);
4136         } while (exception.retry);
4137         return err;
4138 }
4139
4140 static int
4141 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4142 {
4143         struct nfs_client *clp = server->nfs_client;
4144
4145         if (task->tk_status >= 0)
4146                 return 0;
4147         switch(task->tk_status) {
4148                 case -NFS4ERR_DELEG_REVOKED:
4149                 case -NFS4ERR_ADMIN_REVOKED:
4150                 case -NFS4ERR_BAD_STATEID:
4151                         if (state == NULL)
4152                                 break;
4153                         nfs_remove_bad_delegation(state->inode);
4154                 case -NFS4ERR_OPENMODE:
4155                         if (state == NULL)
4156                                 break;
4157                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4158                                 goto stateid_invalid;
4159                         goto wait_on_recovery;
4160                 case -NFS4ERR_EXPIRED:
4161                         if (state != NULL) {
4162                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4163                                         goto stateid_invalid;
4164                         }
4165                 case -NFS4ERR_STALE_STATEID:
4166                 case -NFS4ERR_STALE_CLIENTID:
4167                         nfs4_schedule_lease_recovery(clp);
4168                         goto wait_on_recovery;
4169 #if defined(CONFIG_NFS_V4_1)
4170                 case -NFS4ERR_BADSESSION:
4171                 case -NFS4ERR_BADSLOT:
4172                 case -NFS4ERR_BAD_HIGH_SLOT:
4173                 case -NFS4ERR_DEADSESSION:
4174                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4175                 case -NFS4ERR_SEQ_FALSE_RETRY:
4176                 case -NFS4ERR_SEQ_MISORDERED:
4177                         dprintk("%s ERROR %d, Reset session\n", __func__,
4178                                 task->tk_status);
4179                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4180                         task->tk_status = 0;
4181                         return -EAGAIN;
4182 #endif /* CONFIG_NFS_V4_1 */
4183                 case -NFS4ERR_DELAY:
4184                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4185                 case -NFS4ERR_GRACE:
4186                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4187                         task->tk_status = 0;
4188                         return -EAGAIN;
4189                 case -NFS4ERR_RETRY_UNCACHED_REP:
4190                 case -NFS4ERR_OLD_STATEID:
4191                         task->tk_status = 0;
4192                         return -EAGAIN;
4193         }
4194         task->tk_status = nfs4_map_errors(task->tk_status);
4195         return 0;
4196 stateid_invalid:
4197         task->tk_status = -EIO;
4198         return 0;
4199 wait_on_recovery:
4200         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4201         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4202                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4203         task->tk_status = 0;
4204         return -EAGAIN;
4205 }
4206
4207 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4208                                     nfs4_verifier *bootverf)
4209 {
4210         __be32 verf[2];
4211
4212         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4213                 /* An impossible timestamp guarantees this value
4214                  * will never match a generated boot time. */
4215                 verf[0] = 0;
4216                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4217         } else {
4218                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4219                 verf[0] = (__be32)nn->boot_time.tv_sec;
4220                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4221         }
4222         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4223 }
4224
4225 static unsigned int
4226 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4227                                    char *buf, size_t len)
4228 {
4229         unsigned int result;
4230
4231         rcu_read_lock();
4232         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4233                                 clp->cl_ipaddr,
4234                                 rpc_peeraddr2str(clp->cl_rpcclient,
4235                                                         RPC_DISPLAY_ADDR),
4236                                 rpc_peeraddr2str(clp->cl_rpcclient,
4237                                                         RPC_DISPLAY_PROTO));
4238         rcu_read_unlock();
4239         return result;
4240 }
4241
4242 static unsigned int
4243 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4244                                 char *buf, size_t len)
4245 {
4246         char *nodename = clp->cl_rpcclient->cl_nodename;
4247
4248         if (nfs4_client_id_uniquifier[0] != '\0')
4249                 nodename = nfs4_client_id_uniquifier;
4250         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4251                                 clp->rpc_ops->version, clp->cl_minorversion,
4252                                 nodename);
4253 }
4254
4255 /**
4256  * nfs4_proc_setclientid - Negotiate client ID
4257  * @clp: state data structure
4258  * @program: RPC program for NFSv4 callback service
4259  * @port: IP port number for NFS4 callback service
4260  * @cred: RPC credential to use for this call
4261  * @res: where to place the result
4262  *
4263  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4264  */
4265 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4266                 unsigned short port, struct rpc_cred *cred,
4267                 struct nfs4_setclientid_res *res)
4268 {
4269         nfs4_verifier sc_verifier;
4270         struct nfs4_setclientid setclientid = {
4271                 .sc_verifier = &sc_verifier,
4272                 .sc_prog = program,
4273                 .sc_cb_ident = clp->cl_cb_ident,
4274         };
4275         struct rpc_message msg = {
4276                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4277                 .rpc_argp = &setclientid,
4278                 .rpc_resp = res,
4279                 .rpc_cred = cred,
4280         };
4281         int status;
4282
4283         /* nfs_client_id4 */
4284         nfs4_init_boot_verifier(clp, &sc_verifier);
4285         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4286                 setclientid.sc_name_len =
4287                                 nfs4_init_uniform_client_string(clp,
4288                                                 setclientid.sc_name,
4289                                                 sizeof(setclientid.sc_name));
4290         else
4291                 setclientid.sc_name_len =
4292                                 nfs4_init_nonuniform_client_string(clp,
4293                                                 setclientid.sc_name,
4294                                                 sizeof(setclientid.sc_name));
4295         /* cb_client4 */
4296         rcu_read_lock();
4297         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4298                                 sizeof(setclientid.sc_netid),
4299                                 rpc_peeraddr2str(clp->cl_rpcclient,
4300                                                         RPC_DISPLAY_NETID));
4301         rcu_read_unlock();
4302         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4303                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4304                                 clp->cl_ipaddr, port >> 8, port & 255);
4305
4306         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4307                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4308                 setclientid.sc_name_len, setclientid.sc_name);
4309         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4310         dprintk("NFS reply setclientid: %d\n", status);
4311         return status;
4312 }
4313
4314 /**
4315  * nfs4_proc_setclientid_confirm - Confirm client ID
4316  * @clp: state data structure
4317  * @res: result of a previous SETCLIENTID
4318  * @cred: RPC credential to use for this call
4319  *
4320  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4321  */
4322 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4323                 struct nfs4_setclientid_res *arg,
4324                 struct rpc_cred *cred)
4325 {
4326         struct nfs_fsinfo fsinfo;
4327         struct rpc_message msg = {
4328                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4329                 .rpc_argp = arg,
4330                 .rpc_resp = &fsinfo,
4331                 .rpc_cred = cred,
4332         };
4333         unsigned long now;
4334         int status;
4335
4336         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4337                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4338                 clp->cl_clientid);
4339         now = jiffies;
4340         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4341         if (status == 0) {
4342                 spin_lock(&clp->cl_lock);
4343                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4344                 clp->cl_last_renewal = now;
4345                 spin_unlock(&clp->cl_lock);
4346         }
4347         dprintk("NFS reply setclientid_confirm: %d\n", status);
4348         return status;
4349 }
4350
4351 struct nfs4_delegreturndata {
4352         struct nfs4_delegreturnargs args;
4353         struct nfs4_delegreturnres res;
4354         struct nfs_fh fh;
4355         nfs4_stateid stateid;
4356         unsigned long timestamp;
4357         struct nfs_fattr fattr;
4358         int rpc_status;
4359 };
4360
4361 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4362 {
4363         struct nfs4_delegreturndata *data = calldata;
4364
4365         if (!nfs4_sequence_done(task, &data->res.seq_res))
4366                 return;
4367
4368         switch (task->tk_status) {
4369         case -NFS4ERR_STALE_STATEID:
4370         case -NFS4ERR_EXPIRED:
4371         case 0:
4372                 renew_lease(data->res.server, data->timestamp);
4373                 break;
4374         default:
4375                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4376                                 -EAGAIN) {
4377                         rpc_restart_call_prepare(task);
4378                         return;
4379                 }
4380         }
4381         data->rpc_status = task->tk_status;
4382 }
4383
4384 static void nfs4_delegreturn_release(void *calldata)
4385 {
4386         kfree(calldata);
4387 }
4388
4389 #if defined(CONFIG_NFS_V4_1)
4390 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4391 {
4392         struct nfs4_delegreturndata *d_data;
4393
4394         d_data = (struct nfs4_delegreturndata *)data;
4395
4396         nfs4_setup_sequence(d_data->res.server,
4397                         &d_data->args.seq_args,
4398                         &d_data->res.seq_res,
4399                         task);
4400 }
4401 #endif /* CONFIG_NFS_V4_1 */
4402
4403 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4404 #if defined(CONFIG_NFS_V4_1)
4405         .rpc_call_prepare = nfs4_delegreturn_prepare,
4406 #endif /* CONFIG_NFS_V4_1 */
4407         .rpc_call_done = nfs4_delegreturn_done,
4408         .rpc_release = nfs4_delegreturn_release,
4409 };
4410
4411 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4412 {
4413         struct nfs4_delegreturndata *data;
4414         struct nfs_server *server = NFS_SERVER(inode);
4415         struct rpc_task *task;
4416         struct rpc_message msg = {
4417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4418                 .rpc_cred = cred,
4419         };
4420         struct rpc_task_setup task_setup_data = {
4421                 .rpc_client = server->client,
4422                 .rpc_message = &msg,
4423                 .callback_ops = &nfs4_delegreturn_ops,
4424                 .flags = RPC_TASK_ASYNC,
4425         };
4426         int status = 0;
4427
4428         data = kzalloc(sizeof(*data), GFP_NOFS);
4429         if (data == NULL)
4430                 return -ENOMEM;
4431         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4432         data->args.fhandle = &data->fh;
4433         data->args.stateid = &data->stateid;
4434         data->args.bitmask = server->cache_consistency_bitmask;
4435         nfs_copy_fh(&data->fh, NFS_FH(inode));
4436         nfs4_stateid_copy(&data->stateid, stateid);
4437         data->res.fattr = &data->fattr;
4438         data->res.server = server;
4439         nfs_fattr_init(data->res.fattr);
4440         data->timestamp = jiffies;
4441         data->rpc_status = 0;
4442
4443         task_setup_data.callback_data = data;
4444         msg.rpc_argp = &data->args;
4445         msg.rpc_resp = &data->res;
4446         task = rpc_run_task(&task_setup_data);
4447         if (IS_ERR(task))
4448                 return PTR_ERR(task);
4449         if (!issync)
4450                 goto out;
4451         status = nfs4_wait_for_completion_rpc_task(task);
4452         if (status != 0)
4453                 goto out;
4454         status = data->rpc_status;
4455         if (status == 0)
4456                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4457         else
4458                 nfs_refresh_inode(inode, &data->fattr);
4459 out:
4460         rpc_put_task(task);
4461         return status;
4462 }
4463
4464 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4465 {
4466         struct nfs_server *server = NFS_SERVER(inode);
4467         struct nfs4_exception exception = { };
4468         int err;
4469         do {
4470                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4471                 switch (err) {
4472                         case -NFS4ERR_STALE_STATEID:
4473                         case -NFS4ERR_EXPIRED:
4474                         case 0:
4475                                 return 0;
4476                 }
4477                 err = nfs4_handle_exception(server, err, &exception);
4478         } while (exception.retry);
4479         return err;
4480 }
4481
4482 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4483 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4484
4485 /*
4486  * sleep, with exponential backoff, and retry the LOCK operation.
4487  */
4488 static unsigned long
4489 nfs4_set_lock_task_retry(unsigned long timeout)
4490 {
4491         freezable_schedule_timeout_killable(timeout);
4492         timeout <<= 1;
4493         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4494                 return NFS4_LOCK_MAXTIMEOUT;
4495         return timeout;
4496 }
4497
4498 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4499 {
4500         struct inode *inode = state->inode;
4501         struct nfs_server *server = NFS_SERVER(inode);
4502         struct nfs_client *clp = server->nfs_client;
4503         struct nfs_lockt_args arg = {
4504                 .fh = NFS_FH(inode),
4505                 .fl = request,
4506         };
4507         struct nfs_lockt_res res = {
4508                 .denied = request,
4509         };
4510         struct rpc_message msg = {
4511                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4512                 .rpc_argp       = &arg,
4513                 .rpc_resp       = &res,
4514                 .rpc_cred       = state->owner->so_cred,
4515         };
4516         struct nfs4_lock_state *lsp;
4517         int status;
4518
4519         arg.lock_owner.clientid = clp->cl_clientid;
4520         status = nfs4_set_lock_state(state, request);
4521         if (status != 0)
4522                 goto out;
4523         lsp = request->fl_u.nfs4_fl.owner;
4524         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4525         arg.lock_owner.s_dev = server->s_dev;
4526         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4527         switch (status) {
4528                 case 0:
4529                         request->fl_type = F_UNLCK;
4530                         break;
4531                 case -NFS4ERR_DENIED:
4532                         status = 0;
4533         }
4534         request->fl_ops->fl_release_private(request);
4535 out:
4536         return status;
4537 }
4538
4539 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4540 {
4541         struct nfs4_exception exception = { };
4542         int err;
4543
4544         do {
4545                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4546                                 _nfs4_proc_getlk(state, cmd, request),
4547                                 &exception);
4548         } while (exception.retry);
4549         return err;
4550 }
4551
4552 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4553 {
4554         int res = 0;
4555         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4556                 case FL_POSIX:
4557                         res = posix_lock_file_wait(file, fl);
4558                         break;
4559                 case FL_FLOCK:
4560                         res = flock_lock_file_wait(file, fl);
4561                         break;
4562                 default:
4563                         BUG();
4564         }
4565         return res;
4566 }
4567
4568 struct nfs4_unlockdata {
4569         struct nfs_locku_args arg;
4570         struct nfs_locku_res res;
4571         struct nfs4_lock_state *lsp;
4572         struct nfs_open_context *ctx;
4573         struct file_lock fl;
4574         const struct nfs_server *server;
4575         unsigned long timestamp;
4576 };
4577
4578 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4579                 struct nfs_open_context *ctx,
4580                 struct nfs4_lock_state *lsp,
4581                 struct nfs_seqid *seqid)
4582 {
4583         struct nfs4_unlockdata *p;
4584         struct inode *inode = lsp->ls_state->inode;
4585
4586         p = kzalloc(sizeof(*p), GFP_NOFS);
4587         if (p == NULL)
4588                 return NULL;
4589         p->arg.fh = NFS_FH(inode);
4590         p->arg.fl = &p->fl;
4591         p->arg.seqid = seqid;
4592         p->res.seqid = seqid;
4593         p->arg.stateid = &lsp->ls_stateid;
4594         p->lsp = lsp;
4595         atomic_inc(&lsp->ls_count);
4596         /* Ensure we don't close file until we're done freeing locks! */
4597         p->ctx = get_nfs_open_context(ctx);
4598         memcpy(&p->fl, fl, sizeof(p->fl));
4599         p->server = NFS_SERVER(inode);
4600         return p;
4601 }
4602
4603 static void nfs4_locku_release_calldata(void *data)
4604 {
4605         struct nfs4_unlockdata *calldata = data;
4606         nfs_free_seqid(calldata->arg.seqid);
4607         nfs4_put_lock_state(calldata->lsp);
4608         put_nfs_open_context(calldata->ctx);
4609         kfree(calldata);
4610 }
4611
4612 static void nfs4_locku_done(struct rpc_task *task, void *data)
4613 {
4614         struct nfs4_unlockdata *calldata = data;
4615
4616         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4617                 return;
4618         switch (task->tk_status) {
4619                 case 0:
4620                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4621                                         &calldata->res.stateid);
4622                         renew_lease(calldata->server, calldata->timestamp);
4623                         break;
4624                 case -NFS4ERR_BAD_STATEID:
4625                 case -NFS4ERR_OLD_STATEID:
4626                 case -NFS4ERR_STALE_STATEID:
4627                 case -NFS4ERR_EXPIRED:
4628                         break;
4629                 default:
4630                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4631                                 rpc_restart_call_prepare(task);
4632         }
4633         nfs_release_seqid(calldata->arg.seqid);
4634 }
4635
4636 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4637 {
4638         struct nfs4_unlockdata *calldata = data;
4639
4640         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4641                 goto out_wait;
4642         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4643                 /* Note: exit _without_ running nfs4_locku_done */
4644                 goto out_no_action;
4645         }
4646         calldata->timestamp = jiffies;
4647         if (nfs4_setup_sequence(calldata->server,
4648                                 &calldata->arg.seq_args,
4649                                 &calldata->res.seq_res,
4650                                 task) != 0)
4651                 nfs_release_seqid(calldata->arg.seqid);
4652         return;
4653 out_no_action:
4654         task->tk_action = NULL;
4655 out_wait:
4656         nfs4_sequence_done(task, &calldata->res.seq_res);
4657 }
4658
4659 static const struct rpc_call_ops nfs4_locku_ops = {
4660         .rpc_call_prepare = nfs4_locku_prepare,
4661         .rpc_call_done = nfs4_locku_done,
4662         .rpc_release = nfs4_locku_release_calldata,
4663 };
4664
4665 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4666                 struct nfs_open_context *ctx,
4667                 struct nfs4_lock_state *lsp,
4668                 struct nfs_seqid *seqid)
4669 {
4670         struct nfs4_unlockdata *data;
4671         struct rpc_message msg = {
4672                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4673                 .rpc_cred = ctx->cred,
4674         };
4675         struct rpc_task_setup task_setup_data = {
4676                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4677                 .rpc_message = &msg,
4678                 .callback_ops = &nfs4_locku_ops,
4679                 .workqueue = nfsiod_workqueue,
4680                 .flags = RPC_TASK_ASYNC,
4681         };
4682
4683         /* Ensure this is an unlock - when canceling a lock, the
4684          * canceled lock is passed in, and it won't be an unlock.
4685          */
4686         fl->fl_type = F_UNLCK;
4687
4688         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4689         if (data == NULL) {
4690                 nfs_free_seqid(seqid);
4691                 return ERR_PTR(-ENOMEM);
4692         }
4693
4694         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4695         msg.rpc_argp = &data->arg;
4696         msg.rpc_resp = &data->res;
4697         task_setup_data.callback_data = data;
4698         return rpc_run_task(&task_setup_data);
4699 }
4700
4701 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4702 {
4703         struct inode *inode = state->inode;
4704         struct nfs4_state_owner *sp = state->owner;
4705         struct nfs_inode *nfsi = NFS_I(inode);
4706         struct nfs_seqid *seqid;
4707         struct nfs4_lock_state *lsp;
4708         struct rpc_task *task;
4709         int status = 0;
4710         unsigned char fl_flags = request->fl_flags;
4711
4712         status = nfs4_set_lock_state(state, request);
4713         /* Unlock _before_ we do the RPC call */
4714         request->fl_flags |= FL_EXISTS;
4715         /* Exclude nfs_delegation_claim_locks() */
4716         mutex_lock(&sp->so_delegreturn_mutex);
4717         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4718         down_read(&nfsi->rwsem);
4719         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4720                 up_read(&nfsi->rwsem);
4721                 mutex_unlock(&sp->so_delegreturn_mutex);
4722                 goto out;
4723         }
4724         up_read(&nfsi->rwsem);
4725         mutex_unlock(&sp->so_delegreturn_mutex);
4726         if (status != 0)
4727                 goto out;
4728         /* Is this a delegated lock? */
4729         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4730                 goto out;
4731         lsp = request->fl_u.nfs4_fl.owner;
4732         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4733         status = -ENOMEM;
4734         if (seqid == NULL)
4735                 goto out;
4736         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4737         status = PTR_ERR(task);
4738         if (IS_ERR(task))
4739                 goto out;
4740         status = nfs4_wait_for_completion_rpc_task(task);
4741         rpc_put_task(task);
4742 out:
4743         request->fl_flags = fl_flags;
4744         return status;
4745 }
4746
4747 struct nfs4_lockdata {
4748         struct nfs_lock_args arg;
4749         struct nfs_lock_res res;
4750         struct nfs4_lock_state *lsp;
4751         struct nfs_open_context *ctx;
4752         struct file_lock fl;
4753         unsigned long timestamp;
4754         int rpc_status;
4755         int cancelled;
4756         struct nfs_server *server;
4757 };
4758
4759 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4760                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4761                 gfp_t gfp_mask)
4762 {
4763         struct nfs4_lockdata *p;
4764         struct inode *inode = lsp->ls_state->inode;
4765         struct nfs_server *server = NFS_SERVER(inode);
4766
4767         p = kzalloc(sizeof(*p), gfp_mask);
4768         if (p == NULL)
4769                 return NULL;
4770
4771         p->arg.fh = NFS_FH(inode);
4772         p->arg.fl = &p->fl;
4773         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4774         if (p->arg.open_seqid == NULL)
4775                 goto out_free;
4776         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4777         if (p->arg.lock_seqid == NULL)
4778                 goto out_free_seqid;
4779         p->arg.lock_stateid = &lsp->ls_stateid;
4780         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4781         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4782         p->arg.lock_owner.s_dev = server->s_dev;
4783         p->res.lock_seqid = p->arg.lock_seqid;
4784         p->lsp = lsp;
4785         p->server = server;
4786         atomic_inc(&lsp->ls_count);
4787         p->ctx = get_nfs_open_context(ctx);
4788         memcpy(&p->fl, fl, sizeof(p->fl));
4789         return p;
4790 out_free_seqid:
4791         nfs_free_seqid(p->arg.open_seqid);
4792 out_free:
4793         kfree(p);
4794         return NULL;
4795 }
4796
4797 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4798 {
4799         struct nfs4_lockdata *data = calldata;
4800         struct nfs4_state *state = data->lsp->ls_state;
4801
4802         dprintk("%s: begin!\n", __func__);
4803         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4804                 goto out_wait;
4805         /* Do we need to do an open_to_lock_owner? */
4806         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4807                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4808                         goto out_release_lock_seqid;
4809                 }
4810                 data->arg.open_stateid = &state->open_stateid;
4811                 data->arg.new_lock_owner = 1;
4812                 data->res.open_seqid = data->arg.open_seqid;
4813         } else
4814                 data->arg.new_lock_owner = 0;
4815         if (!nfs4_valid_open_stateid(state)) {
4816                 data->rpc_status = -EBADF;
4817                 task->tk_action = NULL;
4818                 goto out_release_open_seqid;
4819         }
4820         data->timestamp = jiffies;
4821         if (nfs4_setup_sequence(data->server,
4822                                 &data->arg.seq_args,
4823                                 &data->res.seq_res,
4824                                 task) == 0)
4825                 return;
4826 out_release_open_seqid:
4827         nfs_release_seqid(data->arg.open_seqid);
4828 out_release_lock_seqid:
4829         nfs_release_seqid(data->arg.lock_seqid);
4830 out_wait:
4831         nfs4_sequence_done(task, &data->res.seq_res);
4832         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4833 }
4834
4835 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4836 {
4837         struct nfs4_lockdata *data = calldata;
4838
4839         dprintk("%s: begin!\n", __func__);
4840
4841         if (!nfs4_sequence_done(task, &data->res.seq_res))
4842                 return;
4843
4844         data->rpc_status = task->tk_status;
4845         if (data->arg.new_lock_owner != 0) {
4846                 if (data->rpc_status == 0)
4847                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4848                 else
4849                         goto out;
4850         }
4851         if (data->rpc_status == 0) {
4852                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4853                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4854                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4855         }
4856 out:
4857         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4858 }
4859
4860 static void nfs4_lock_release(void *calldata)
4861 {
4862         struct nfs4_lockdata *data = calldata;
4863
4864         dprintk("%s: begin!\n", __func__);
4865         nfs_free_seqid(data->arg.open_seqid);
4866         if (data->cancelled != 0) {
4867                 struct rpc_task *task;
4868                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4869                                 data->arg.lock_seqid);
4870                 if (!IS_ERR(task))
4871                         rpc_put_task_async(task);
4872                 dprintk("%s: cancelling lock!\n", __func__);
4873         } else
4874                 nfs_free_seqid(data->arg.lock_seqid);
4875         nfs4_put_lock_state(data->lsp);
4876         put_nfs_open_context(data->ctx);
4877         kfree(data);
4878         dprintk("%s: done!\n", __func__);
4879 }
4880
4881 static const struct rpc_call_ops nfs4_lock_ops = {
4882         .rpc_call_prepare = nfs4_lock_prepare,
4883         .rpc_call_done = nfs4_lock_done,
4884         .rpc_release = nfs4_lock_release,
4885 };
4886
4887 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4888 {
4889         switch (error) {
4890         case -NFS4ERR_ADMIN_REVOKED:
4891         case -NFS4ERR_BAD_STATEID:
4892                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4893                 if (new_lock_owner != 0 ||
4894                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4895                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4896                 break;
4897         case -NFS4ERR_STALE_STATEID:
4898                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4899         case -NFS4ERR_EXPIRED:
4900                 nfs4_schedule_lease_recovery(server->nfs_client);
4901         };
4902 }
4903
4904 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4905 {
4906         struct nfs4_lockdata *data;
4907         struct rpc_task *task;
4908         struct rpc_message msg = {
4909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4910                 .rpc_cred = state->owner->so_cred,
4911         };
4912         struct rpc_task_setup task_setup_data = {
4913                 .rpc_client = NFS_CLIENT(state->inode),
4914                 .rpc_message = &msg,
4915                 .callback_ops = &nfs4_lock_ops,
4916                 .workqueue = nfsiod_workqueue,
4917                 .flags = RPC_TASK_ASYNC,
4918         };
4919         int ret;
4920
4921         dprintk("%s: begin!\n", __func__);
4922         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4923                         fl->fl_u.nfs4_fl.owner,
4924                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4925         if (data == NULL)
4926                 return -ENOMEM;
4927         if (IS_SETLKW(cmd))
4928                 data->arg.block = 1;
4929         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4930         msg.rpc_argp = &data->arg;
4931         msg.rpc_resp = &data->res;
4932         task_setup_data.callback_data = data;
4933         if (recovery_type > NFS_LOCK_NEW) {
4934                 if (recovery_type == NFS_LOCK_RECLAIM)
4935                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4936                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4937         }
4938         task = rpc_run_task(&task_setup_data);
4939         if (IS_ERR(task))
4940                 return PTR_ERR(task);
4941         ret = nfs4_wait_for_completion_rpc_task(task);
4942         if (ret == 0) {
4943                 ret = data->rpc_status;
4944                 if (ret)
4945                         nfs4_handle_setlk_error(data->server, data->lsp,
4946                                         data->arg.new_lock_owner, ret);
4947         } else
4948                 data->cancelled = 1;
4949         rpc_put_task(task);
4950         dprintk("%s: done, ret = %d!\n", __func__, ret);
4951         return ret;
4952 }
4953
4954 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4955 {
4956         struct nfs_server *server = NFS_SERVER(state->inode);
4957         struct nfs4_exception exception = {
4958                 .inode = state->inode,
4959         };
4960         int err;
4961
4962         do {
4963                 /* Cache the lock if possible... */
4964                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4965                         return 0;
4966                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4967                 if (err != -NFS4ERR_DELAY)
4968                         break;
4969                 nfs4_handle_exception(server, err, &exception);
4970         } while (exception.retry);
4971         return err;
4972 }
4973
4974 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4975 {
4976         struct nfs_server *server = NFS_SERVER(state->inode);
4977         struct nfs4_exception exception = {
4978                 .inode = state->inode,
4979         };
4980         int err;
4981
4982         err = nfs4_set_lock_state(state, request);
4983         if (err != 0)
4984                 return err;
4985         do {
4986                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4987                         return 0;
4988                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4989                 switch (err) {
4990                 default:
4991                         goto out;
4992                 case -NFS4ERR_GRACE:
4993                 case -NFS4ERR_DELAY:
4994                         nfs4_handle_exception(server, err, &exception);
4995                         err = 0;
4996                 }
4997         } while (exception.retry);
4998 out:
4999         return err;
5000 }
5001
5002 #if defined(CONFIG_NFS_V4_1)
5003 /**
5004  * nfs41_check_expired_locks - possibly free a lock stateid
5005  *
5006  * @state: NFSv4 state for an inode
5007  *
5008  * Returns NFS_OK if recovery for this stateid is now finished.
5009  * Otherwise a negative NFS4ERR value is returned.
5010  */
5011 static int nfs41_check_expired_locks(struct nfs4_state *state)
5012 {
5013         int status, ret = -NFS4ERR_BAD_STATEID;
5014         struct nfs4_lock_state *lsp;
5015         struct nfs_server *server = NFS_SERVER(state->inode);
5016
5017         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5018                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5019                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
5020                         if (status != NFS_OK) {
5021                                 /* Free the stateid unless the server
5022                                  * informs us the stateid is unrecognized. */
5023                                 if (status != -NFS4ERR_BAD_STATEID)
5024                                         nfs41_free_stateid(server,
5025                                                         &lsp->ls_stateid);
5026                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5027                                 ret = status;
5028                         }
5029                 }
5030         };
5031
5032         return ret;
5033 }
5034
5035 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5036 {
5037         int status = NFS_OK;
5038
5039         if (test_bit(LK_STATE_IN_USE, &state->flags))
5040                 status = nfs41_check_expired_locks(state);
5041         if (status != NFS_OK)
5042                 status = nfs4_lock_expired(state, request);
5043         return status;
5044 }
5045 #endif
5046
5047 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5048 {
5049         struct nfs4_state_owner *sp = state->owner;
5050         struct nfs_inode *nfsi = NFS_I(state->inode);
5051         unsigned char fl_flags = request->fl_flags;
5052         unsigned int seq;
5053         int status = -ENOLCK;
5054
5055         if ((fl_flags & FL_POSIX) &&
5056                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5057                 goto out;
5058         /* Is this a delegated open? */
5059         status = nfs4_set_lock_state(state, request);
5060         if (status != 0)
5061                 goto out;
5062         request->fl_flags |= FL_ACCESS;
5063         status = do_vfs_lock(request->fl_file, request);
5064         if (status < 0)
5065                 goto out;
5066         down_read(&nfsi->rwsem);
5067         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5068                 /* Yes: cache locks! */
5069                 /* ...but avoid races with delegation recall... */
5070                 request->fl_flags = fl_flags & ~FL_SLEEP;
5071                 status = do_vfs_lock(request->fl_file, request);
5072                 goto out_unlock;
5073         }
5074         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5075         up_read(&nfsi->rwsem);
5076         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5077         if (status != 0)
5078                 goto out;
5079         down_read(&nfsi->rwsem);
5080         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5081                 status = -NFS4ERR_DELAY;
5082                 goto out_unlock;
5083         }
5084         /* Note: we always want to sleep here! */
5085         request->fl_flags = fl_flags | FL_SLEEP;
5086         if (do_vfs_lock(request->fl_file, request) < 0)
5087                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5088                         "manager!\n", __func__);
5089 out_unlock:
5090         up_read(&nfsi->rwsem);
5091 out:
5092         request->fl_flags = fl_flags;
5093         return status;
5094 }
5095
5096 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5097 {
5098         struct nfs4_exception exception = {
5099                 .state = state,
5100                 .inode = state->inode,
5101         };
5102         int err;
5103
5104         do {
5105                 err = _nfs4_proc_setlk(state, cmd, request);
5106                 if (err == -NFS4ERR_DENIED)
5107                         err = -EAGAIN;
5108                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5109                                 err, &exception);
5110         } while (exception.retry);
5111         return err;
5112 }
5113
5114 static int
5115 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5116 {
5117         struct nfs_open_context *ctx;
5118         struct nfs4_state *state;
5119         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5120         int status;
5121
5122         /* verify open state */
5123         ctx = nfs_file_open_context(filp);
5124         state = ctx->state;
5125
5126         if (request->fl_start < 0 || request->fl_end < 0)
5127                 return -EINVAL;
5128
5129         if (IS_GETLK(cmd)) {
5130                 if (state != NULL)
5131                         return nfs4_proc_getlk(state, F_GETLK, request);
5132                 return 0;
5133         }
5134
5135         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5136                 return -EINVAL;
5137
5138         if (request->fl_type == F_UNLCK) {
5139                 if (state != NULL)
5140                         return nfs4_proc_unlck(state, cmd, request);
5141                 return 0;
5142         }
5143
5144         if (state == NULL)
5145                 return -ENOLCK;
5146         /*
5147          * Don't rely on the VFS having checked the file open mode,
5148          * since it won't do this for flock() locks.
5149          */
5150         switch (request->fl_type) {
5151         case F_RDLCK:
5152                 if (!(filp->f_mode & FMODE_READ))
5153                         return -EBADF;
5154                 break;
5155         case F_WRLCK:
5156                 if (!(filp->f_mode & FMODE_WRITE))
5157                         return -EBADF;
5158         }
5159
5160         do {
5161                 status = nfs4_proc_setlk(state, cmd, request);
5162                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5163                         break;
5164                 timeout = nfs4_set_lock_task_retry(timeout);
5165                 status = -ERESTARTSYS;
5166                 if (signalled())
5167                         break;
5168         } while(status < 0);
5169         return status;
5170 }
5171
5172 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5173 {
5174         struct nfs_server *server = NFS_SERVER(state->inode);
5175         int err;
5176
5177         err = nfs4_set_lock_state(state, fl);
5178         if (err != 0)
5179                 return err;
5180         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5181         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5182 }
5183
5184 struct nfs_release_lockowner_data {
5185         struct nfs4_lock_state *lsp;
5186         struct nfs_server *server;
5187         struct nfs_release_lockowner_args args;
5188 };
5189
5190 static void nfs4_release_lockowner_release(void *calldata)
5191 {
5192         struct nfs_release_lockowner_data *data = calldata;
5193         nfs4_free_lock_state(data->server, data->lsp);
5194         kfree(calldata);
5195 }
5196
5197 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5198         .rpc_release = nfs4_release_lockowner_release,
5199 };
5200
5201 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5202 {
5203         struct nfs_server *server = lsp->ls_state->owner->so_server;
5204         struct nfs_release_lockowner_data *data;
5205         struct rpc_message msg = {
5206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5207         };
5208
5209         if (server->nfs_client->cl_mvops->minor_version != 0)
5210                 return -EINVAL;
5211         data = kmalloc(sizeof(*data), GFP_NOFS);
5212         if (!data)
5213                 return -ENOMEM;
5214         data->lsp = lsp;
5215         data->server = server;
5216         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5217         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5218         data->args.lock_owner.s_dev = server->s_dev;
5219         msg.rpc_argp = &data->args;
5220         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5221         return 0;
5222 }
5223
5224 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5225
5226 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5227                                    const void *buf, size_t buflen,
5228                                    int flags, int type)
5229 {
5230         if (strcmp(key, "") != 0)
5231                 return -EINVAL;
5232
5233         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5234 }
5235
5236 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5237                                    void *buf, size_t buflen, int type)
5238 {
5239         if (strcmp(key, "") != 0)
5240                 return -EINVAL;
5241
5242         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5243 }
5244
5245 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5246                                        size_t list_len, const char *name,
5247                                        size_t name_len, int type)
5248 {
5249         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5250
5251         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5252                 return 0;
5253
5254         if (list && len <= list_len)
5255                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5256         return len;
5257 }
5258
5259 /*
5260  * nfs_fhget will use either the mounted_on_fileid or the fileid
5261  */
5262 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5263 {
5264         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5265                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5266               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5267               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5268                 return;
5269
5270         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5271                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5272         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5273         fattr->nlink = 2;
5274 }
5275
5276 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5277                                    const struct qstr *name,
5278                                    struct nfs4_fs_locations *fs_locations,
5279                                    struct page *page)
5280 {
5281         struct nfs_server *server = NFS_SERVER(dir);
5282         u32 bitmask[2] = {
5283                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5284         };
5285         struct nfs4_fs_locations_arg args = {
5286                 .dir_fh = NFS_FH(dir),
5287                 .name = name,
5288                 .page = page,
5289                 .bitmask = bitmask,
5290         };
5291         struct nfs4_fs_locations_res res = {
5292                 .fs_locations = fs_locations,
5293         };
5294         struct rpc_message msg = {
5295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5296                 .rpc_argp = &args,
5297                 .rpc_resp = &res,
5298         };
5299         int status;
5300
5301         dprintk("%s: start\n", __func__);
5302
5303         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5304          * is not supported */
5305         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5306                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5307         else
5308                 bitmask[0] |= FATTR4_WORD0_FILEID;
5309
5310         nfs_fattr_init(&fs_locations->fattr);
5311         fs_locations->server = server;
5312         fs_locations->nlocations = 0;
5313         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5314         dprintk("%s: returned status = %d\n", __func__, status);
5315         return status;
5316 }
5317
5318 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5319                            const struct qstr *name,
5320                            struct nfs4_fs_locations *fs_locations,
5321                            struct page *page)
5322 {
5323         struct nfs4_exception exception = { };
5324         int err;
5325         do {
5326                 err = nfs4_handle_exception(NFS_SERVER(dir),
5327                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5328                                 &exception);
5329         } while (exception.retry);
5330         return err;
5331 }
5332
5333 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5334 {
5335         int status;
5336         struct nfs4_secinfo_arg args = {
5337                 .dir_fh = NFS_FH(dir),
5338                 .name   = name,
5339         };
5340         struct nfs4_secinfo_res res = {
5341                 .flavors     = flavors,
5342         };
5343         struct rpc_message msg = {
5344                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5345                 .rpc_argp = &args,
5346                 .rpc_resp = &res,
5347         };
5348
5349         dprintk("NFS call  secinfo %s\n", name->name);
5350         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5351         dprintk("NFS reply  secinfo: %d\n", status);
5352         return status;
5353 }
5354
5355 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5356                       struct nfs4_secinfo_flavors *flavors)
5357 {
5358         struct nfs4_exception exception = { };
5359         int err;
5360         do {
5361                 err = nfs4_handle_exception(NFS_SERVER(dir),
5362                                 _nfs4_proc_secinfo(dir, name, flavors),
5363                                 &exception);
5364         } while (exception.retry);
5365         return err;
5366 }
5367
5368 #ifdef CONFIG_NFS_V4_1
5369 /*
5370  * Check the exchange flags returned by the server for invalid flags, having
5371  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5372  * DS flags set.
5373  */
5374 static int nfs4_check_cl_exchange_flags(u32 flags)
5375 {
5376         if (flags & ~EXCHGID4_FLAG_MASK_R)
5377                 goto out_inval;
5378         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5379             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5380                 goto out_inval;
5381         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5382                 goto out_inval;
5383         return NFS_OK;
5384 out_inval:
5385         return -NFS4ERR_INVAL;
5386 }
5387
5388 static bool
5389 nfs41_same_server_scope(struct nfs41_server_scope *a,
5390                         struct nfs41_server_scope *b)
5391 {
5392         if (a->server_scope_sz == b->server_scope_sz &&
5393             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5394                 return true;
5395
5396         return false;
5397 }
5398
5399 /*
5400  * nfs4_proc_bind_conn_to_session()
5401  *
5402  * The 4.1 client currently uses the same TCP connection for the
5403  * fore and backchannel.
5404  */
5405 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5406 {
5407         int status;
5408         struct nfs41_bind_conn_to_session_res res;
5409         struct rpc_message msg = {
5410                 .rpc_proc =
5411                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5412                 .rpc_argp = clp,
5413                 .rpc_resp = &res,
5414                 .rpc_cred = cred,
5415         };
5416
5417         dprintk("--> %s\n", __func__);
5418
5419         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5420         if (unlikely(res.session == NULL)) {
5421                 status = -ENOMEM;
5422                 goto out;
5423         }
5424
5425         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5426         if (status == 0) {
5427                 if (memcmp(res.session->sess_id.data,
5428                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5429                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5430                         status = -EIO;
5431                         goto out_session;
5432                 }
5433                 if (res.dir != NFS4_CDFS4_BOTH) {
5434                         dprintk("NFS: %s: Unexpected direction from server\n",
5435                                 __func__);
5436                         status = -EIO;
5437                         goto out_session;
5438                 }
5439                 if (res.use_conn_in_rdma_mode) {
5440                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5441                                 __func__);
5442                         status = -EIO;
5443                         goto out_session;
5444                 }
5445         }
5446 out_session:
5447         kfree(res.session);
5448 out:
5449         dprintk("<-- %s status= %d\n", __func__, status);
5450         return status;
5451 }
5452
5453 /*
5454  * nfs4_proc_exchange_id()
5455  *
5456  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5457  *
5458  * Since the clientid has expired, all compounds using sessions
5459  * associated with the stale clientid will be returning
5460  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5461  * be in some phase of session reset.
5462  */
5463 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5464 {
5465         nfs4_verifier verifier;
5466         struct nfs41_exchange_id_args args = {
5467                 .verifier = &verifier,
5468                 .client = clp,
5469                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5470         };
5471         struct nfs41_exchange_id_res res = {
5472                 0
5473         };
5474         int status;
5475         struct rpc_message msg = {
5476                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5477                 .rpc_argp = &args,
5478                 .rpc_resp = &res,
5479                 .rpc_cred = cred,
5480         };
5481
5482         nfs4_init_boot_verifier(clp, &verifier);
5483         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5484                                                         sizeof(args.id));
5485         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5486                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5487                 args.id_len, args.id);
5488
5489         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5490                                         GFP_NOFS);
5491         if (unlikely(res.server_owner == NULL)) {
5492                 status = -ENOMEM;
5493                 goto out;
5494         }
5495
5496         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5497                                         GFP_NOFS);
5498         if (unlikely(res.server_scope == NULL)) {
5499                 status = -ENOMEM;
5500                 goto out_server_owner;
5501         }
5502
5503         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5504         if (unlikely(res.impl_id == NULL)) {
5505                 status = -ENOMEM;
5506                 goto out_server_scope;
5507         }
5508
5509         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5510         if (status == 0)
5511                 status = nfs4_check_cl_exchange_flags(res.flags);
5512
5513         if (status == 0) {
5514                 clp->cl_clientid = res.clientid;
5515                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5516                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5517                         clp->cl_seqid = res.seqid;
5518
5519                 kfree(clp->cl_serverowner);
5520                 clp->cl_serverowner = res.server_owner;
5521                 res.server_owner = NULL;
5522
5523                 /* use the most recent implementation id */
5524                 kfree(clp->cl_implid);
5525                 clp->cl_implid = res.impl_id;
5526
5527                 if (clp->cl_serverscope != NULL &&
5528                     !nfs41_same_server_scope(clp->cl_serverscope,
5529                                              res.server_scope)) {
5530                         dprintk("%s: server_scope mismatch detected\n",
5531                                 __func__);
5532                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5533                         kfree(clp->cl_serverscope);
5534                         clp->cl_serverscope = NULL;
5535                 }
5536
5537                 if (clp->cl_serverscope == NULL) {
5538                         clp->cl_serverscope = res.server_scope;
5539                         goto out;
5540                 }
5541         } else
5542                 kfree(res.impl_id);
5543
5544 out_server_owner:
5545         kfree(res.server_owner);
5546 out_server_scope:
5547         kfree(res.server_scope);
5548 out:
5549         if (clp->cl_implid != NULL)
5550                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5551                         "domain: %s, name: %s, date: %llu,%u\n",
5552                         clp->cl_implid->domain, clp->cl_implid->name,
5553                         clp->cl_implid->date.seconds,
5554                         clp->cl_implid->date.nseconds);
5555         dprintk("NFS reply exchange_id: %d\n", status);
5556         return status;
5557 }
5558
5559 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5560                 struct rpc_cred *cred)
5561 {
5562         struct rpc_message msg = {
5563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5564                 .rpc_argp = clp,
5565                 .rpc_cred = cred,
5566         };
5567         int status;
5568
5569         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5570         if (status)
5571                 dprintk("NFS: Got error %d from the server %s on "
5572                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5573         return status;
5574 }
5575
5576 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5577                 struct rpc_cred *cred)
5578 {
5579         unsigned int loop;
5580         int ret;
5581
5582         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5583                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5584                 switch (ret) {
5585                 case -NFS4ERR_DELAY:
5586                 case -NFS4ERR_CLIENTID_BUSY:
5587                         ssleep(1);
5588                         break;
5589                 default:
5590                         return ret;
5591                 }
5592         }
5593         return 0;
5594 }
5595
5596 int nfs4_destroy_clientid(struct nfs_client *clp)
5597 {
5598         struct rpc_cred *cred;
5599         int ret = 0;
5600
5601         if (clp->cl_mvops->minor_version < 1)
5602                 goto out;
5603         if (clp->cl_exchange_flags == 0)
5604                 goto out;
5605         if (clp->cl_preserve_clid)
5606                 goto out;
5607         cred = nfs4_get_exchange_id_cred(clp);
5608         ret = nfs4_proc_destroy_clientid(clp, cred);
5609         if (cred)
5610                 put_rpccred(cred);
5611         switch (ret) {
5612         case 0:
5613         case -NFS4ERR_STALE_CLIENTID:
5614                 clp->cl_exchange_flags = 0;
5615         }
5616 out:
5617         return ret;
5618 }
5619
5620 struct nfs4_get_lease_time_data {
5621         struct nfs4_get_lease_time_args *args;
5622         struct nfs4_get_lease_time_res *res;
5623         struct nfs_client *clp;
5624 };
5625
5626 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5627                                         void *calldata)
5628 {
5629         struct nfs4_get_lease_time_data *data =
5630                         (struct nfs4_get_lease_time_data *)calldata;
5631
5632         dprintk("--> %s\n", __func__);
5633         /* just setup sequence, do not trigger session recovery
5634            since we're invoked within one */
5635         nfs41_setup_sequence(data->clp->cl_session,
5636                         &data->args->la_seq_args,
5637                         &data->res->lr_seq_res,
5638                         task);
5639         dprintk("<-- %s\n", __func__);
5640 }
5641
5642 /*
5643  * Called from nfs4_state_manager thread for session setup, so don't recover
5644  * from sequence operation or clientid errors.
5645  */
5646 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5647 {
5648         struct nfs4_get_lease_time_data *data =
5649                         (struct nfs4_get_lease_time_data *)calldata;
5650
5651         dprintk("--> %s\n", __func__);
5652         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5653                 return;
5654         switch (task->tk_status) {
5655         case -NFS4ERR_DELAY:
5656         case -NFS4ERR_GRACE:
5657                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5658                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5659                 task->tk_status = 0;
5660                 /* fall through */
5661         case -NFS4ERR_RETRY_UNCACHED_REP:
5662                 rpc_restart_call_prepare(task);
5663                 return;
5664         }
5665         dprintk("<-- %s\n", __func__);
5666 }
5667
5668 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5669         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5670         .rpc_call_done = nfs4_get_lease_time_done,
5671 };
5672
5673 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5674 {
5675         struct rpc_task *task;
5676         struct nfs4_get_lease_time_args args;
5677         struct nfs4_get_lease_time_res res = {
5678                 .lr_fsinfo = fsinfo,
5679         };
5680         struct nfs4_get_lease_time_data data = {
5681                 .args = &args,
5682                 .res = &res,
5683                 .clp = clp,
5684         };
5685         struct rpc_message msg = {
5686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5687                 .rpc_argp = &args,
5688                 .rpc_resp = &res,
5689         };
5690         struct rpc_task_setup task_setup = {
5691                 .rpc_client = clp->cl_rpcclient,
5692                 .rpc_message = &msg,
5693                 .callback_ops = &nfs4_get_lease_time_ops,
5694                 .callback_data = &data,
5695                 .flags = RPC_TASK_TIMEOUT,
5696         };
5697         int status;
5698
5699         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5700         nfs4_set_sequence_privileged(&args.la_seq_args);
5701         dprintk("--> %s\n", __func__);
5702         task = rpc_run_task(&task_setup);
5703
5704         if (IS_ERR(task))
5705                 status = PTR_ERR(task);
5706         else {
5707                 status = task->tk_status;
5708                 rpc_put_task(task);
5709         }
5710         dprintk("<-- %s return %d\n", __func__, status);
5711
5712         return status;
5713 }
5714
5715 /*
5716  * Initialize the values to be used by the client in CREATE_SESSION
5717  * If nfs4_init_session set the fore channel request and response sizes,
5718  * use them.
5719  *
5720  * Set the back channel max_resp_sz_cached to zero to force the client to
5721  * always set csa_cachethis to FALSE because the current implementation
5722  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5723  */
5724 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5725 {
5726         struct nfs4_session *session = args->client->cl_session;
5727         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5728                      mxresp_sz = session->fc_target_max_resp_sz;
5729
5730         if (mxrqst_sz == 0)
5731                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5732         if (mxresp_sz == 0)
5733                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5734         /* Fore channel attributes */
5735         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5736         args->fc_attrs.max_resp_sz = mxresp_sz;
5737         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5738         args->fc_attrs.max_reqs = max_session_slots;
5739
5740         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5741                 "max_ops=%u max_reqs=%u\n",
5742                 __func__,
5743                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5744                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5745
5746         /* Back channel attributes */
5747         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5748         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5749         args->bc_attrs.max_resp_sz_cached = 0;
5750         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5751         args->bc_attrs.max_reqs = 1;
5752
5753         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5754                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5755                 __func__,
5756                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5757                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5758                 args->bc_attrs.max_reqs);
5759 }
5760
5761 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5762 {
5763         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5764         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5765
5766         if (rcvd->max_resp_sz > sent->max_resp_sz)
5767                 return -EINVAL;
5768         /*
5769          * Our requested max_ops is the minimum we need; we're not
5770          * prepared to break up compounds into smaller pieces than that.
5771          * So, no point even trying to continue if the server won't
5772          * cooperate:
5773          */
5774         if (rcvd->max_ops < sent->max_ops)
5775                 return -EINVAL;
5776         if (rcvd->max_reqs == 0)
5777                 return -EINVAL;
5778         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5779                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5780         return 0;
5781 }
5782
5783 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5784 {
5785         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5786         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5787
5788         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5789                 return -EINVAL;
5790         if (rcvd->max_resp_sz < sent->max_resp_sz)
5791                 return -EINVAL;
5792         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5793                 return -EINVAL;
5794         /* These would render the backchannel useless: */
5795         if (rcvd->max_ops != sent->max_ops)
5796                 return -EINVAL;
5797         if (rcvd->max_reqs != sent->max_reqs)
5798                 return -EINVAL;
5799         return 0;
5800 }
5801
5802 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5803                                      struct nfs4_session *session)
5804 {
5805         int ret;
5806
5807         ret = nfs4_verify_fore_channel_attrs(args, session);
5808         if (ret)
5809                 return ret;
5810         return nfs4_verify_back_channel_attrs(args, session);
5811 }
5812
5813 static int _nfs4_proc_create_session(struct nfs_client *clp,
5814                 struct rpc_cred *cred)
5815 {
5816         struct nfs4_session *session = clp->cl_session;
5817         struct nfs41_create_session_args args = {
5818                 .client = clp,
5819                 .cb_program = NFS4_CALLBACK,
5820         };
5821         struct nfs41_create_session_res res = {
5822                 .client = clp,
5823         };
5824         struct rpc_message msg = {
5825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5826                 .rpc_argp = &args,
5827                 .rpc_resp = &res,
5828                 .rpc_cred = cred,
5829         };
5830         int status;
5831
5832         nfs4_init_channel_attrs(&args);
5833         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5834
5835         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5836
5837         if (!status) {
5838                 /* Verify the session's negotiated channel_attrs values */
5839                 status = nfs4_verify_channel_attrs(&args, session);
5840                 /* Increment the clientid slot sequence id */
5841                 clp->cl_seqid++;
5842         }
5843
5844         return status;
5845 }
5846
5847 /*
5848  * Issues a CREATE_SESSION operation to the server.
5849  * It is the responsibility of the caller to verify the session is
5850  * expired before calling this routine.
5851  */
5852 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5853 {
5854         int status;
5855         unsigned *ptr;
5856         struct nfs4_session *session = clp->cl_session;
5857
5858         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5859
5860         status = _nfs4_proc_create_session(clp, cred);
5861         if (status)
5862                 goto out;
5863
5864         /* Init or reset the session slot tables */
5865         status = nfs4_setup_session_slot_tables(session);
5866         dprintk("slot table setup returned %d\n", status);
5867         if (status)
5868                 goto out;
5869
5870         ptr = (unsigned *)&session->sess_id.data[0];
5871         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5872                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5873 out:
5874         dprintk("<-- %s\n", __func__);
5875         return status;
5876 }
5877
5878 /*
5879  * Issue the over-the-wire RPC DESTROY_SESSION.
5880  * The caller must serialize access to this routine.
5881  */
5882 int nfs4_proc_destroy_session(struct nfs4_session *session,
5883                 struct rpc_cred *cred)
5884 {
5885         struct rpc_message msg = {
5886                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5887                 .rpc_argp = session,
5888                 .rpc_cred = cred,
5889         };
5890         int status = 0;
5891
5892         dprintk("--> nfs4_proc_destroy_session\n");
5893
5894         /* session is still being setup */
5895         if (session->clp->cl_cons_state != NFS_CS_READY)
5896                 return status;
5897
5898         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5899
5900         if (status)
5901                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5902                         "Session has been destroyed regardless...\n", status);
5903
5904         dprintk("<-- nfs4_proc_destroy_session\n");
5905         return status;
5906 }
5907
5908 /*
5909  * Renew the cl_session lease.
5910  */
5911 struct nfs4_sequence_data {
5912         struct nfs_client *clp;
5913         struct nfs4_sequence_args args;
5914         struct nfs4_sequence_res res;
5915 };
5916
5917 static void nfs41_sequence_release(void *data)
5918 {
5919         struct nfs4_sequence_data *calldata = data;
5920         struct nfs_client *clp = calldata->clp;
5921
5922         if (atomic_read(&clp->cl_count) > 1)
5923                 nfs4_schedule_state_renewal(clp);
5924         nfs_put_client(clp);
5925         kfree(calldata);
5926 }
5927
5928 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5929 {
5930         switch(task->tk_status) {
5931         case -NFS4ERR_DELAY:
5932                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5933                 return -EAGAIN;
5934         default:
5935                 nfs4_schedule_lease_recovery(clp);
5936         }
5937         return 0;
5938 }
5939
5940 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5941 {
5942         struct nfs4_sequence_data *calldata = data;
5943         struct nfs_client *clp = calldata->clp;
5944
5945         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5946                 return;
5947
5948         if (task->tk_status < 0) {
5949                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5950                 if (atomic_read(&clp->cl_count) == 1)
5951                         goto out;
5952
5953                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5954                         rpc_restart_call_prepare(task);
5955                         return;
5956                 }
5957         }
5958         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5959 out:
5960         dprintk("<-- %s\n", __func__);
5961 }
5962
5963 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5964 {
5965         struct nfs4_sequence_data *calldata = data;
5966         struct nfs_client *clp = calldata->clp;
5967         struct nfs4_sequence_args *args;
5968         struct nfs4_sequence_res *res;
5969
5970         args = task->tk_msg.rpc_argp;
5971         res = task->tk_msg.rpc_resp;
5972
5973         nfs41_setup_sequence(clp->cl_session, args, res, task);
5974 }
5975
5976 static const struct rpc_call_ops nfs41_sequence_ops = {
5977         .rpc_call_done = nfs41_sequence_call_done,
5978         .rpc_call_prepare = nfs41_sequence_prepare,
5979         .rpc_release = nfs41_sequence_release,
5980 };
5981
5982 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5983                 struct rpc_cred *cred,
5984                 bool is_privileged)
5985 {
5986         struct nfs4_sequence_data *calldata;
5987         struct rpc_message msg = {
5988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5989                 .rpc_cred = cred,
5990         };
5991         struct rpc_task_setup task_setup_data = {
5992                 .rpc_client = clp->cl_rpcclient,
5993                 .rpc_message = &msg,
5994                 .callback_ops = &nfs41_sequence_ops,
5995                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
5996         };
5997
5998         if (!atomic_inc_not_zero(&clp->cl_count))
5999                 return ERR_PTR(-EIO);
6000         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6001         if (calldata == NULL) {
6002                 nfs_put_client(clp);
6003                 return ERR_PTR(-ENOMEM);
6004         }
6005         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6006         if (is_privileged)
6007                 nfs4_set_sequence_privileged(&calldata->args);
6008         msg.rpc_argp = &calldata->args;
6009         msg.rpc_resp = &calldata->res;
6010         calldata->clp = clp;
6011         task_setup_data.callback_data = calldata;
6012
6013         return rpc_run_task(&task_setup_data);
6014 }
6015
6016 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6017 {
6018         struct rpc_task *task;
6019         int ret = 0;
6020
6021         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6022                 return 0;
6023         task = _nfs41_proc_sequence(clp, cred, false);
6024         if (IS_ERR(task))
6025                 ret = PTR_ERR(task);
6026         else
6027                 rpc_put_task_async(task);
6028         dprintk("<-- %s status=%d\n", __func__, ret);
6029         return ret;
6030 }
6031
6032 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6033 {
6034         struct rpc_task *task;
6035         int ret;
6036
6037         task = _nfs41_proc_sequence(clp, cred, true);
6038         if (IS_ERR(task)) {
6039                 ret = PTR_ERR(task);
6040                 goto out;
6041         }
6042         ret = rpc_wait_for_completion_task(task);
6043         if (!ret) {
6044                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6045
6046                 if (task->tk_status == 0)
6047                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6048                 ret = task->tk_status;
6049         }
6050         rpc_put_task(task);
6051 out:
6052         dprintk("<-- %s status=%d\n", __func__, ret);
6053         return ret;
6054 }
6055
6056 struct nfs4_reclaim_complete_data {
6057         struct nfs_client *clp;
6058         struct nfs41_reclaim_complete_args arg;
6059         struct nfs41_reclaim_complete_res res;
6060 };
6061
6062 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6063 {
6064         struct nfs4_reclaim_complete_data *calldata = data;
6065
6066         nfs41_setup_sequence(calldata->clp->cl_session,
6067                         &calldata->arg.seq_args,
6068                         &calldata->res.seq_res,
6069                         task);
6070 }
6071
6072 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6073 {
6074         switch(task->tk_status) {
6075         case 0:
6076         case -NFS4ERR_COMPLETE_ALREADY:
6077         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6078                 break;
6079         case -NFS4ERR_DELAY:
6080                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6081                 /* fall through */
6082         case -NFS4ERR_RETRY_UNCACHED_REP:
6083                 return -EAGAIN;
6084         default:
6085                 nfs4_schedule_lease_recovery(clp);
6086         }
6087         return 0;
6088 }
6089
6090 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6091 {
6092         struct nfs4_reclaim_complete_data *calldata = data;
6093         struct nfs_client *clp = calldata->clp;
6094         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6095
6096         dprintk("--> %s\n", __func__);
6097         if (!nfs41_sequence_done(task, res))
6098                 return;
6099
6100         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6101                 rpc_restart_call_prepare(task);
6102                 return;
6103         }
6104         dprintk("<-- %s\n", __func__);
6105 }
6106
6107 static void nfs4_free_reclaim_complete_data(void *data)
6108 {
6109         struct nfs4_reclaim_complete_data *calldata = data;
6110
6111         kfree(calldata);
6112 }
6113
6114 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6115         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6116         .rpc_call_done = nfs4_reclaim_complete_done,
6117         .rpc_release = nfs4_free_reclaim_complete_data,
6118 };
6119
6120 /*
6121  * Issue a global reclaim complete.
6122  */
6123 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6124 {
6125         struct nfs4_reclaim_complete_data *calldata;
6126         struct rpc_task *task;
6127         struct rpc_message msg = {
6128                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6129         };
6130         struct rpc_task_setup task_setup_data = {
6131                 .rpc_client = clp->cl_rpcclient,
6132                 .rpc_message = &msg,
6133                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6134                 .flags = RPC_TASK_ASYNC,
6135         };
6136         int status = -ENOMEM;
6137
6138         dprintk("--> %s\n", __func__);
6139         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6140         if (calldata == NULL)
6141                 goto out;
6142         calldata->clp = clp;
6143         calldata->arg.one_fs = 0;
6144
6145         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6146         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6147         msg.rpc_argp = &calldata->arg;
6148         msg.rpc_resp = &calldata->res;
6149         task_setup_data.callback_data = calldata;
6150         task = rpc_run_task(&task_setup_data);
6151         if (IS_ERR(task)) {
6152                 status = PTR_ERR(task);
6153                 goto out;
6154         }
6155         status = nfs4_wait_for_completion_rpc_task(task);
6156         if (status == 0)
6157                 status = task->tk_status;
6158         rpc_put_task(task);
6159         return 0;
6160 out:
6161         dprintk("<-- %s status=%d\n", __func__, status);
6162         return status;
6163 }
6164
6165 static void
6166 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6167 {
6168         struct nfs4_layoutget *lgp = calldata;
6169         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6170         struct nfs4_session *session = nfs4_get_session(server);
6171
6172         dprintk("--> %s\n", __func__);
6173         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6174          * right now covering the LAYOUTGET we are about to send.
6175          * However, that is not so catastrophic, and there seems
6176          * to be no way to prevent it completely.
6177          */
6178         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6179                                 &lgp->res.seq_res, task))
6180                 return;
6181         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6182                                           NFS_I(lgp->args.inode)->layout,
6183                                           lgp->args.ctx->state)) {
6184                 rpc_exit(task, NFS4_OK);
6185         }
6186 }
6187
6188 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6189 {
6190         struct nfs4_layoutget *lgp = calldata;
6191         struct inode *inode = lgp->args.inode;
6192         struct nfs_server *server = NFS_SERVER(inode);
6193         struct pnfs_layout_hdr *lo;
6194         struct nfs4_state *state = NULL;
6195         unsigned long timeo, giveup;
6196
6197         dprintk("--> %s\n", __func__);
6198
6199         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6200                 goto out;
6201
6202         switch (task->tk_status) {
6203         case 0:
6204                 goto out;
6205         case -NFS4ERR_LAYOUTTRYLATER:
6206         case -NFS4ERR_RECALLCONFLICT:
6207                 timeo = rpc_get_timeout(task->tk_client);
6208                 giveup = lgp->args.timestamp + timeo;
6209                 if (time_after(giveup, jiffies))
6210                         task->tk_status = -NFS4ERR_DELAY;
6211                 break;
6212         case -NFS4ERR_EXPIRED:
6213         case -NFS4ERR_BAD_STATEID:
6214                 spin_lock(&inode->i_lock);
6215                 lo = NFS_I(inode)->layout;
6216                 if (!lo || list_empty(&lo->plh_segs)) {
6217                         spin_unlock(&inode->i_lock);
6218                         /* If the open stateid was bad, then recover it. */
6219                         state = lgp->args.ctx->state;
6220                 } else {
6221                         LIST_HEAD(head);
6222
6223                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6224                         spin_unlock(&inode->i_lock);
6225                         /* Mark the bad layout state as invalid, then
6226                          * retry using the open stateid. */
6227                         pnfs_free_lseg_list(&head);
6228                 }
6229         }
6230         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6231                 rpc_restart_call_prepare(task);
6232 out:
6233         dprintk("<-- %s\n", __func__);
6234 }
6235
6236 static size_t max_response_pages(struct nfs_server *server)
6237 {
6238         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6239         return nfs_page_array_len(0, max_resp_sz);
6240 }
6241
6242 static void nfs4_free_pages(struct page **pages, size_t size)
6243 {
6244         int i;
6245
6246         if (!pages)
6247                 return;
6248
6249         for (i = 0; i < size; i++) {
6250                 if (!pages[i])
6251                         break;
6252                 __free_page(pages[i]);
6253         }
6254         kfree(pages);
6255 }
6256
6257 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6258 {
6259         struct page **pages;
6260         int i;
6261
6262         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6263         if (!pages) {
6264                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6265                 return NULL;
6266         }
6267
6268         for (i = 0; i < size; i++) {
6269                 pages[i] = alloc_page(gfp_flags);
6270                 if (!pages[i]) {
6271                         dprintk("%s: failed to allocate page\n", __func__);
6272                         nfs4_free_pages(pages, size);
6273                         return NULL;
6274                 }
6275         }
6276
6277         return pages;
6278 }
6279
6280 static void nfs4_layoutget_release(void *calldata)
6281 {
6282         struct nfs4_layoutget *lgp = calldata;
6283         struct inode *inode = lgp->args.inode;
6284         struct nfs_server *server = NFS_SERVER(inode);
6285         size_t max_pages = max_response_pages(server);
6286
6287         dprintk("--> %s\n", __func__);
6288         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6289         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6290         put_nfs_open_context(lgp->args.ctx);
6291         kfree(calldata);
6292         dprintk("<-- %s\n", __func__);
6293 }
6294
6295 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6296         .rpc_call_prepare = nfs4_layoutget_prepare,
6297         .rpc_call_done = nfs4_layoutget_done,
6298         .rpc_release = nfs4_layoutget_release,
6299 };
6300
6301 struct pnfs_layout_segment *
6302 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6303 {
6304         struct inode *inode = lgp->args.inode;
6305         struct nfs_server *server = NFS_SERVER(inode);
6306         size_t max_pages = max_response_pages(server);
6307         struct rpc_task *task;
6308         struct rpc_message msg = {
6309                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6310                 .rpc_argp = &lgp->args,
6311                 .rpc_resp = &lgp->res,
6312         };
6313         struct rpc_task_setup task_setup_data = {
6314                 .rpc_client = server->client,
6315                 .rpc_message = &msg,
6316                 .callback_ops = &nfs4_layoutget_call_ops,
6317                 .callback_data = lgp,
6318                 .flags = RPC_TASK_ASYNC,
6319         };
6320         struct pnfs_layout_segment *lseg = NULL;
6321         int status = 0;
6322
6323         dprintk("--> %s\n", __func__);
6324
6325         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6326         if (!lgp->args.layout.pages) {
6327                 nfs4_layoutget_release(lgp);
6328                 return ERR_PTR(-ENOMEM);
6329         }
6330         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6331         lgp->args.timestamp = jiffies;
6332
6333         lgp->res.layoutp = &lgp->args.layout;
6334         lgp->res.seq_res.sr_slot = NULL;
6335         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6336
6337         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6338         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6339
6340         task = rpc_run_task(&task_setup_data);
6341         if (IS_ERR(task))
6342                 return ERR_CAST(task);
6343         status = nfs4_wait_for_completion_rpc_task(task);
6344         if (status == 0)
6345                 status = task->tk_status;
6346         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6347         if (status == 0 && lgp->res.layoutp->len)
6348                 lseg = pnfs_layout_process(lgp);
6349         rpc_put_task(task);
6350         dprintk("<-- %s status=%d\n", __func__, status);
6351         if (status)
6352                 return ERR_PTR(status);
6353         return lseg;
6354 }
6355
6356 static void
6357 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6358 {
6359         struct nfs4_layoutreturn *lrp = calldata;
6360
6361         dprintk("--> %s\n", __func__);
6362         nfs41_setup_sequence(lrp->clp->cl_session,
6363                         &lrp->args.seq_args,
6364                         &lrp->res.seq_res,
6365                         task);
6366 }
6367
6368 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6369 {
6370         struct nfs4_layoutreturn *lrp = calldata;
6371         struct nfs_server *server;
6372
6373         dprintk("--> %s\n", __func__);
6374
6375         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6376                 return;
6377
6378         server = NFS_SERVER(lrp->args.inode);
6379         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6380                 rpc_restart_call_prepare(task);
6381                 return;
6382         }
6383         dprintk("<-- %s\n", __func__);
6384 }
6385
6386 static void nfs4_layoutreturn_release(void *calldata)
6387 {
6388         struct nfs4_layoutreturn *lrp = calldata;
6389         struct pnfs_layout_hdr *lo = lrp->args.layout;
6390
6391         dprintk("--> %s\n", __func__);
6392         spin_lock(&lo->plh_inode->i_lock);
6393         if (lrp->res.lrs_present)
6394                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6395         lo->plh_block_lgets--;
6396         spin_unlock(&lo->plh_inode->i_lock);
6397         pnfs_put_layout_hdr(lrp->args.layout);
6398         kfree(calldata);
6399         dprintk("<-- %s\n", __func__);
6400 }
6401
6402 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6403         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6404         .rpc_call_done = nfs4_layoutreturn_done,
6405         .rpc_release = nfs4_layoutreturn_release,
6406 };
6407
6408 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6409 {
6410         struct rpc_task *task;
6411         struct rpc_message msg = {
6412                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6413                 .rpc_argp = &lrp->args,
6414                 .rpc_resp = &lrp->res,
6415         };
6416         struct rpc_task_setup task_setup_data = {
6417                 .rpc_client = lrp->clp->cl_rpcclient,
6418                 .rpc_message = &msg,
6419                 .callback_ops = &nfs4_layoutreturn_call_ops,
6420                 .callback_data = lrp,
6421         };
6422         int status;
6423
6424         dprintk("--> %s\n", __func__);
6425         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6426         task = rpc_run_task(&task_setup_data);
6427         if (IS_ERR(task))
6428                 return PTR_ERR(task);
6429         status = task->tk_status;
6430         dprintk("<-- %s status=%d\n", __func__, status);
6431         rpc_put_task(task);
6432         return status;
6433 }
6434
6435 /*
6436  * Retrieve the list of Data Server devices from the MDS.
6437  */
6438 static int _nfs4_getdevicelist(struct nfs_server *server,
6439                                     const struct nfs_fh *fh,
6440                                     struct pnfs_devicelist *devlist)
6441 {
6442         struct nfs4_getdevicelist_args args = {
6443                 .fh = fh,
6444                 .layoutclass = server->pnfs_curr_ld->id,
6445         };
6446         struct nfs4_getdevicelist_res res = {
6447                 .devlist = devlist,
6448         };
6449         struct rpc_message msg = {
6450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6451                 .rpc_argp = &args,
6452                 .rpc_resp = &res,
6453         };
6454         int status;
6455
6456         dprintk("--> %s\n", __func__);
6457         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6458                                 &res.seq_res, 0);
6459         dprintk("<-- %s status=%d\n", __func__, status);
6460         return status;
6461 }
6462
6463 int nfs4_proc_getdevicelist(struct nfs_server *server,
6464                             const struct nfs_fh *fh,
6465                             struct pnfs_devicelist *devlist)
6466 {
6467         struct nfs4_exception exception = { };
6468         int err;
6469
6470         do {
6471                 err = nfs4_handle_exception(server,
6472                                 _nfs4_getdevicelist(server, fh, devlist),
6473                                 &exception);
6474         } while (exception.retry);
6475
6476         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6477                 err, devlist->num_devs);
6478
6479         return err;
6480 }
6481 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6482
6483 static int
6484 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6485 {
6486         struct nfs4_getdeviceinfo_args args = {
6487                 .pdev = pdev,
6488         };
6489         struct nfs4_getdeviceinfo_res res = {
6490                 .pdev = pdev,
6491         };
6492         struct rpc_message msg = {
6493                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6494                 .rpc_argp = &args,
6495                 .rpc_resp = &res,
6496         };
6497         int status;
6498
6499         dprintk("--> %s\n", __func__);
6500         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6501         dprintk("<-- %s status=%d\n", __func__, status);
6502
6503         return status;
6504 }
6505
6506 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6507 {
6508         struct nfs4_exception exception = { };
6509         int err;
6510
6511         do {
6512                 err = nfs4_handle_exception(server,
6513                                         _nfs4_proc_getdeviceinfo(server, pdev),
6514                                         &exception);
6515         } while (exception.retry);
6516         return err;
6517 }
6518 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6519
6520 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6521 {
6522         struct nfs4_layoutcommit_data *data = calldata;
6523         struct nfs_server *server = NFS_SERVER(data->args.inode);
6524         struct nfs4_session *session = nfs4_get_session(server);
6525
6526         nfs41_setup_sequence(session,
6527                         &data->args.seq_args,
6528                         &data->res.seq_res,
6529                         task);
6530 }
6531
6532 static void
6533 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6534 {
6535         struct nfs4_layoutcommit_data *data = calldata;
6536         struct nfs_server *server = NFS_SERVER(data->args.inode);
6537
6538         if (!nfs41_sequence_done(task, &data->res.seq_res))
6539                 return;
6540
6541         switch (task->tk_status) { /* Just ignore these failures */
6542         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6543         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6544         case -NFS4ERR_BADLAYOUT:     /* no layout */
6545         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6546                 task->tk_status = 0;
6547                 break;
6548         case 0:
6549                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6550                                                    data->res.fattr);
6551                 break;
6552         default:
6553                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6554                         rpc_restart_call_prepare(task);
6555                         return;
6556                 }
6557         }
6558 }
6559
6560 static void nfs4_layoutcommit_release(void *calldata)
6561 {
6562         struct nfs4_layoutcommit_data *data = calldata;
6563
6564         pnfs_cleanup_layoutcommit(data);
6565         put_rpccred(data->cred);
6566         kfree(data);
6567 }
6568
6569 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6570         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6571         .rpc_call_done = nfs4_layoutcommit_done,
6572         .rpc_release = nfs4_layoutcommit_release,
6573 };
6574
6575 int
6576 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6577 {
6578         struct rpc_message msg = {
6579                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6580                 .rpc_argp = &data->args,
6581                 .rpc_resp = &data->res,
6582                 .rpc_cred = data->cred,
6583         };
6584         struct rpc_task_setup task_setup_data = {
6585                 .task = &data->task,
6586                 .rpc_client = NFS_CLIENT(data->args.inode),
6587                 .rpc_message = &msg,
6588                 .callback_ops = &nfs4_layoutcommit_ops,
6589                 .callback_data = data,
6590                 .flags = RPC_TASK_ASYNC,
6591         };
6592         struct rpc_task *task;
6593         int status = 0;
6594
6595         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6596                 "lbw: %llu inode %lu\n",
6597                 data->task.tk_pid, sync,
6598                 data->args.lastbytewritten,
6599                 data->args.inode->i_ino);
6600
6601         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6602         task = rpc_run_task(&task_setup_data);
6603         if (IS_ERR(task))
6604                 return PTR_ERR(task);
6605         if (sync == false)
6606                 goto out;
6607         status = nfs4_wait_for_completion_rpc_task(task);
6608         if (status != 0)
6609                 goto out;
6610         status = task->tk_status;
6611 out:
6612         dprintk("%s: status %d\n", __func__, status);
6613         rpc_put_task(task);
6614         return status;
6615 }
6616
6617 static int
6618 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6619                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6620 {
6621         struct nfs41_secinfo_no_name_args args = {
6622                 .style = SECINFO_STYLE_CURRENT_FH,
6623         };
6624         struct nfs4_secinfo_res res = {
6625                 .flavors = flavors,
6626         };
6627         struct rpc_message msg = {
6628                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6629                 .rpc_argp = &args,
6630                 .rpc_resp = &res,
6631         };
6632         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6633 }
6634
6635 static int
6636 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6637                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6638 {
6639         struct nfs4_exception exception = { };
6640         int err;
6641         do {
6642                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6643                 switch (err) {
6644                 case 0:
6645                 case -NFS4ERR_WRONGSEC:
6646                 case -NFS4ERR_NOTSUPP:
6647                         goto out;
6648                 default:
6649                         err = nfs4_handle_exception(server, err, &exception);
6650                 }
6651         } while (exception.retry);
6652 out:
6653         return err;
6654 }
6655
6656 static int
6657 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6658                     struct nfs_fsinfo *info)
6659 {
6660         int err;
6661         struct page *page;
6662         rpc_authflavor_t flavor;
6663         struct nfs4_secinfo_flavors *flavors;
6664
6665         page = alloc_page(GFP_KERNEL);
6666         if (!page) {
6667                 err = -ENOMEM;
6668                 goto out;
6669         }
6670
6671         flavors = page_address(page);
6672         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6673
6674         /*
6675          * Fall back on "guess and check" method if
6676          * the server doesn't support SECINFO_NO_NAME
6677          */
6678         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6679                 err = nfs4_find_root_sec(server, fhandle, info);
6680                 goto out_freepage;
6681         }
6682         if (err)
6683                 goto out_freepage;
6684
6685         flavor = nfs_find_best_sec(flavors);
6686         if (err == 0)
6687                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6688
6689 out_freepage:
6690         put_page(page);
6691         if (err == -EACCES)
6692                 return -EPERM;
6693 out:
6694         return err;
6695 }
6696
6697 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6698 {
6699         int status;
6700         struct nfs41_test_stateid_args args = {
6701                 .stateid = stateid,
6702         };
6703         struct nfs41_test_stateid_res res;
6704         struct rpc_message msg = {
6705                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6706                 .rpc_argp = &args,
6707                 .rpc_resp = &res,
6708         };
6709
6710         dprintk("NFS call  test_stateid %p\n", stateid);
6711         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6712         nfs4_set_sequence_privileged(&args.seq_args);
6713         status = nfs4_call_sync_sequence(server->client, server, &msg,
6714                         &args.seq_args, &res.seq_res);
6715         if (status != NFS_OK) {
6716                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6717                 return status;
6718         }
6719         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6720         return -res.status;
6721 }
6722
6723 /**
6724  * nfs41_test_stateid - perform a TEST_STATEID operation
6725  *
6726  * @server: server / transport on which to perform the operation
6727  * @stateid: state ID to test
6728  *
6729  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6730  * Otherwise a negative NFS4ERR value is returned if the operation
6731  * failed or the state ID is not currently valid.
6732  */
6733 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6734 {
6735         struct nfs4_exception exception = { };
6736         int err;
6737         do {
6738                 err = _nfs41_test_stateid(server, stateid);
6739                 if (err != -NFS4ERR_DELAY)
6740                         break;
6741                 nfs4_handle_exception(server, err, &exception);
6742         } while (exception.retry);
6743         return err;
6744 }
6745
6746 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6747 {
6748         struct nfs41_free_stateid_args args = {
6749                 .stateid = stateid,
6750         };
6751         struct nfs41_free_stateid_res res;
6752         struct rpc_message msg = {
6753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6754                 .rpc_argp = &args,
6755                 .rpc_resp = &res,
6756         };
6757         int status;
6758
6759         dprintk("NFS call  free_stateid %p\n", stateid);
6760         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6761         nfs4_set_sequence_privileged(&args.seq_args);
6762         status = nfs4_call_sync_sequence(server->client, server, &msg,
6763                         &args.seq_args, &res.seq_res);
6764         dprintk("NFS reply free_stateid: %d\n", status);
6765         return status;
6766 }
6767
6768 /**
6769  * nfs41_free_stateid - perform a FREE_STATEID operation
6770  *
6771  * @server: server / transport on which to perform the operation
6772  * @stateid: state ID to release
6773  *
6774  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6775  * negative NFS4ERR value is returned.
6776  */
6777 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6778 {
6779         struct nfs4_exception exception = { };
6780         int err;
6781         do {
6782                 err = _nfs4_free_stateid(server, stateid);
6783                 if (err != -NFS4ERR_DELAY)
6784                         break;
6785                 nfs4_handle_exception(server, err, &exception);
6786         } while (exception.retry);
6787         return err;
6788 }
6789
6790 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6791                 const nfs4_stateid *s2)
6792 {
6793         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6794                 return false;
6795
6796         if (s1->seqid == s2->seqid)
6797                 return true;
6798         if (s1->seqid == 0 || s2->seqid == 0)
6799                 return true;
6800
6801         return false;
6802 }
6803
6804 #endif /* CONFIG_NFS_V4_1 */
6805
6806 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6807                 const nfs4_stateid *s2)
6808 {
6809         return nfs4_stateid_match(s1, s2);
6810 }
6811
6812
6813 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6814         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6815         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6816         .recover_open   = nfs4_open_reclaim,
6817         .recover_lock   = nfs4_lock_reclaim,
6818         .establish_clid = nfs4_init_clientid,
6819         .get_clid_cred  = nfs4_get_setclientid_cred,
6820         .detect_trunking = nfs40_discover_server_trunking,
6821 };
6822
6823 #if defined(CONFIG_NFS_V4_1)
6824 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6825         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6826         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6827         .recover_open   = nfs4_open_reclaim,
6828         .recover_lock   = nfs4_lock_reclaim,
6829         .establish_clid = nfs41_init_clientid,
6830         .get_clid_cred  = nfs4_get_exchange_id_cred,
6831         .reclaim_complete = nfs41_proc_reclaim_complete,
6832         .detect_trunking = nfs41_discover_server_trunking,
6833 };
6834 #endif /* CONFIG_NFS_V4_1 */
6835
6836 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6837         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6838         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6839         .recover_open   = nfs4_open_expired,
6840         .recover_lock   = nfs4_lock_expired,
6841         .establish_clid = nfs4_init_clientid,
6842         .get_clid_cred  = nfs4_get_setclientid_cred,
6843 };
6844
6845 #if defined(CONFIG_NFS_V4_1)
6846 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6847         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6848         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6849         .recover_open   = nfs41_open_expired,
6850         .recover_lock   = nfs41_lock_expired,
6851         .establish_clid = nfs41_init_clientid,
6852         .get_clid_cred  = nfs4_get_exchange_id_cred,
6853 };
6854 #endif /* CONFIG_NFS_V4_1 */
6855
6856 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6857         .sched_state_renewal = nfs4_proc_async_renew,
6858         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6859         .renew_lease = nfs4_proc_renew,
6860 };
6861
6862 #if defined(CONFIG_NFS_V4_1)
6863 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6864         .sched_state_renewal = nfs41_proc_async_sequence,
6865         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6866         .renew_lease = nfs4_proc_sequence,
6867 };
6868 #endif
6869
6870 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6871         .minor_version = 0,
6872         .init_caps = NFS_CAP_READDIRPLUS
6873                 | NFS_CAP_ATOMIC_OPEN
6874                 | NFS_CAP_CHANGE_ATTR
6875                 | NFS_CAP_POSIX_LOCK,
6876         .call_sync = _nfs4_call_sync,
6877         .match_stateid = nfs4_match_stateid,
6878         .find_root_sec = nfs4_find_root_sec,
6879         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6880         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6881         .state_renewal_ops = &nfs40_state_renewal_ops,
6882 };
6883
6884 #if defined(CONFIG_NFS_V4_1)
6885 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6886         .minor_version = 1,
6887         .init_caps = NFS_CAP_READDIRPLUS
6888                 | NFS_CAP_ATOMIC_OPEN
6889                 | NFS_CAP_CHANGE_ATTR
6890                 | NFS_CAP_POSIX_LOCK
6891                 | NFS_CAP_STATEID_NFSV41
6892                 | NFS_CAP_ATOMIC_OPEN_V1,
6893         .call_sync = nfs4_call_sync_sequence,
6894         .match_stateid = nfs41_match_stateid,
6895         .find_root_sec = nfs41_find_root_sec,
6896         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6897         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6898         .state_renewal_ops = &nfs41_state_renewal_ops,
6899 };
6900 #endif
6901
6902 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6903         [0] = &nfs_v4_0_minor_ops,
6904 #if defined(CONFIG_NFS_V4_1)
6905         [1] = &nfs_v4_1_minor_ops,
6906 #endif
6907 };
6908
6909 const struct inode_operations nfs4_dir_inode_operations = {
6910         .create         = nfs_create,
6911         .lookup         = nfs_lookup,
6912         .atomic_open    = nfs_atomic_open,
6913         .link           = nfs_link,
6914         .unlink         = nfs_unlink,
6915         .symlink        = nfs_symlink,
6916         .mkdir          = nfs_mkdir,
6917         .rmdir          = nfs_rmdir,
6918         .mknod          = nfs_mknod,
6919         .rename         = nfs_rename,
6920         .permission     = nfs_permission,
6921         .getattr        = nfs_getattr,
6922         .setattr        = nfs_setattr,
6923         .getxattr       = generic_getxattr,
6924         .setxattr       = generic_setxattr,
6925         .listxattr      = generic_listxattr,
6926         .removexattr    = generic_removexattr,
6927 };
6928
6929 static const struct inode_operations nfs4_file_inode_operations = {
6930         .permission     = nfs_permission,
6931         .getattr        = nfs_getattr,
6932         .setattr        = nfs_setattr,
6933         .getxattr       = generic_getxattr,
6934         .setxattr       = generic_setxattr,
6935         .listxattr      = generic_listxattr,
6936         .removexattr    = generic_removexattr,
6937 };
6938
6939 const struct nfs_rpc_ops nfs_v4_clientops = {
6940         .version        = 4,                    /* protocol version */
6941         .dentry_ops     = &nfs4_dentry_operations,
6942         .dir_inode_ops  = &nfs4_dir_inode_operations,
6943         .file_inode_ops = &nfs4_file_inode_operations,
6944         .file_ops       = &nfs4_file_operations,
6945         .getroot        = nfs4_proc_get_root,
6946         .submount       = nfs4_submount,
6947         .try_mount      = nfs4_try_mount,
6948         .getattr        = nfs4_proc_getattr,
6949         .setattr        = nfs4_proc_setattr,
6950         .lookup         = nfs4_proc_lookup,
6951         .access         = nfs4_proc_access,
6952         .readlink       = nfs4_proc_readlink,
6953         .create         = nfs4_proc_create,
6954         .remove         = nfs4_proc_remove,
6955         .unlink_setup   = nfs4_proc_unlink_setup,
6956         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6957         .unlink_done    = nfs4_proc_unlink_done,
6958         .rename         = nfs4_proc_rename,
6959         .rename_setup   = nfs4_proc_rename_setup,
6960         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6961         .rename_done    = nfs4_proc_rename_done,
6962         .link           = nfs4_proc_link,
6963         .symlink        = nfs4_proc_symlink,
6964         .mkdir          = nfs4_proc_mkdir,
6965         .rmdir          = nfs4_proc_remove,
6966         .readdir        = nfs4_proc_readdir,
6967         .mknod          = nfs4_proc_mknod,
6968         .statfs         = nfs4_proc_statfs,
6969         .fsinfo         = nfs4_proc_fsinfo,
6970         .pathconf       = nfs4_proc_pathconf,
6971         .set_capabilities = nfs4_server_capabilities,
6972         .decode_dirent  = nfs4_decode_dirent,
6973         .read_setup     = nfs4_proc_read_setup,
6974         .read_pageio_init = pnfs_pageio_init_read,
6975         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6976         .read_done      = nfs4_read_done,
6977         .write_setup    = nfs4_proc_write_setup,
6978         .write_pageio_init = pnfs_pageio_init_write,
6979         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6980         .write_done     = nfs4_write_done,
6981         .commit_setup   = nfs4_proc_commit_setup,
6982         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6983         .commit_done    = nfs4_commit_done,
6984         .lock           = nfs4_proc_lock,
6985         .clear_acl_cache = nfs4_zap_acl_attr,
6986         .close_context  = nfs4_close_context,
6987         .open_context   = nfs4_atomic_open,
6988         .have_delegation = nfs4_have_delegation,
6989         .return_delegation = nfs4_inode_return_delegation,
6990         .alloc_client   = nfs4_alloc_client,
6991         .init_client    = nfs4_init_client,
6992         .free_client    = nfs4_free_client,
6993         .create_server  = nfs4_create_server,
6994         .clone_server   = nfs_clone_server,
6995 };
6996
6997 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6998         .prefix = XATTR_NAME_NFSV4_ACL,
6999         .list   = nfs4_xattr_list_nfs4_acl,
7000         .get    = nfs4_xattr_get_nfs4_acl,
7001         .set    = nfs4_xattr_set_nfs4_acl,
7002 };
7003
7004 const struct xattr_handler *nfs4_xattr_handlers[] = {
7005         &nfs4_xattr_nfs4_acl_handler,
7006         NULL
7007 };
7008
7009 /*
7010  * Local variables:
7011  *  c-basic-offset: 8
7012  * End:
7013  */