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
  68
  69 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96                 return -EREMOTEIO;
  97         case -NFS4ERR_WRONGSEC:
  98                 return -EPERM;
  99         case -NFS4ERR_BADOWNER:
 100         case -NFS4ERR_BADNAME:
 101                 return -EINVAL;
 102         case -NFS4ERR_SHARE_DENIED:
 103                 return -EACCES;
 104         case -NFS4ERR_MINOR_VERS_MISMATCH:
 105                 return -EPROTONOSUPPORT;
 106         case -NFS4ERR_ACCESS:
 107                 return -EACCES;
 108         default:
 109                 dprintk("%s could not handle NFSv4 error %d\n",
 110                                 __func__, -err);
 111                 break;
 112         }
 113         return -EIO;
 114 }
 115
 116 /*
 117  * This is our standard bitmap for GETATTR requests.
 118  */
 119 const u32 nfs4_fattr_bitmap[3] = {
 120         FATTR4_WORD0_TYPE
 121         | FATTR4_WORD0_CHANGE
 122         | FATTR4_WORD0_SIZE
 123         | FATTR4_WORD0_FSID
 124         | FATTR4_WORD0_FILEID,
 125         FATTR4_WORD1_MODE
 126         | FATTR4_WORD1_NUMLINKS
 127         | FATTR4_WORD1_OWNER
 128         | FATTR4_WORD1_OWNER_GROUP
 129         | FATTR4_WORD1_RAWDEV
 130         | FATTR4_WORD1_SPACE_USED
 131         | FATTR4_WORD1_TIME_ACCESS
 132         | FATTR4_WORD1_TIME_METADATA
 133         | FATTR4_WORD1_TIME_MODIFY
 134 };
 135
 136 static const u32 nfs4_pnfs_open_bitmap[3] = {
 137         FATTR4_WORD0_TYPE
 138         | FATTR4_WORD0_CHANGE
 139         | FATTR4_WORD0_SIZE
 140         | FATTR4_WORD0_FSID
 141         | FATTR4_WORD0_FILEID,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY,
 151         FATTR4_WORD2_MDSTHRESHOLD
 152 };
 153
 154 static const u32 nfs4_open_noattr_bitmap[3] = {
 155         FATTR4_WORD0_TYPE
 156         | FATTR4_WORD0_CHANGE
 157         | FATTR4_WORD0_FILEID,
 158 };
 159
 160 const u32 nfs4_statfs_bitmap[2] = {
 161         FATTR4_WORD0_FILES_AVAIL
 162         | FATTR4_WORD0_FILES_FREE
 163         | FATTR4_WORD0_FILES_TOTAL,
 164         FATTR4_WORD1_SPACE_AVAIL
 165         | FATTR4_WORD1_SPACE_FREE
 166         | FATTR4_WORD1_SPACE_TOTAL
 167 };
 168
 169 const u32 nfs4_pathconf_bitmap[2] = {
 170         FATTR4_WORD0_MAXLINK
 171         | FATTR4_WORD0_MAXNAME,
 172         0
 173 };
 174
 175 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 176                         | FATTR4_WORD0_MAXREAD
 177                         | FATTR4_WORD0_MAXWRITE
 178                         | FATTR4_WORD0_LEASE_TIME,
 179                         FATTR4_WORD1_TIME_DELTA
 180                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 181                         FATTR4_WORD2_LAYOUT_BLKSIZE
 182 };
 183
 184 const u32 nfs4_fs_locations_bitmap[2] = {
 185         FATTR4_WORD0_TYPE
 186         | FATTR4_WORD0_CHANGE
 187         | FATTR4_WORD0_SIZE
 188         | FATTR4_WORD0_FSID
 189         | FATTR4_WORD0_FILEID
 190         | FATTR4_WORD0_FS_LOCATIONS,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID
 201 };
 202
 203 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 204                 struct nfs4_readdir_arg *readdir)
 205 {
 206         __be32 *start, *p;
 207
 208         if (cookie > 2) {
 209                 readdir->cookie = cookie;
 210                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 211                 return;
 212         }
 213
 214         readdir->cookie = 0;
 215         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 216         if (cookie == 2)
 217                 return;
 218
 219         /*
 220          * NFSv4 servers do not return entries for '.' and '..'
 221          * Therefore, we fake these entries here.  We let '.'
 222          * have cookie 0 and '..' have cookie 1.  Note that
 223          * when talking to the server, we always send cookie 0
 224          * instead of 1 or 2.
 225          */
 226         start = p = kmap_atomic(*readdir->pages);
 227
 228         if (cookie == 0) {
 229                 *p++ = xdr_one;                                  /* next */
 230                 *p++ = xdr_zero;                   /* cookie, first word */
 231                 *p++ = xdr_one;                   /* cookie, second word */
 232                 *p++ = xdr_one;                             /* entry len */
 233                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 234                 p++;
 235                 *p++ = xdr_one;                         /* bitmap length */
 236                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 237                 *p++ = htonl(8);              /* attribute buffer length */
 238                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 239         }
 240
 241         *p++ = xdr_one;                                  /* next */
 242         *p++ = xdr_zero;                   /* cookie, first word */
 243         *p++ = xdr_two;                   /* cookie, second word */
 244         *p++ = xdr_two;                             /* entry len */
 245         memcpy(p, "..\0\0", 4);                         /* entry */
 246         p++;
 247         *p++ = xdr_one;                         /* bitmap length */
 248         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 249         *p++ = htonl(8);              /* attribute buffer length */
 250         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 251
 252         readdir->pgbase = (char *)p - (char *)start;
 253         readdir->count -= readdir->pgbase;
 254         kunmap_atomic(start);
 255 }
 256
 257 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 258 {
 259         int res = 0;
 260
 261         might_sleep();
 262
 263         if (*timeout <= 0)
 264                 *timeout = NFS4_POLL_RETRY_MIN;
 265         if (*timeout > NFS4_POLL_RETRY_MAX)
 266                 *timeout = NFS4_POLL_RETRY_MAX;
 267         freezable_schedule_timeout_killable(*timeout);
 268         if (fatal_signal_pending(current))
 269                 res = -ERESTARTSYS;
 270         *timeout <<= 1;
 271         return res;
 272 }
 273
 274 /* This is the error handling routine for processes that are allowed
 275  * to sleep.
 276  */
 277 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 278 {
 279         struct nfs_client *clp = server->nfs_client;
 280         struct nfs4_state *state = exception->state;
 281         struct inode *inode = exception->inode;
 282         int ret = errorcode;
 283
 284         exception->retry = 0;
 285         switch(errorcode) {
 286                 case 0:
 287                         return 0;
 288                 case -NFS4ERR_OPENMODE:
 289                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 290                                 nfs4_inode_return_delegation(inode);
 291                                 exception->retry = 1;
 292                                 return 0;
 293                         }
 294                         if (state == NULL)
 295                                 break;
 296                         nfs4_schedule_stateid_recovery(server, state);
 297                         goto wait_on_recovery;
 298                 case -NFS4ERR_DELEG_REVOKED:
 299                 case -NFS4ERR_ADMIN_REVOKED:
 300                 case -NFS4ERR_BAD_STATEID:
 301                         if (state == NULL)
 302                                 break;
 303                         nfs_remove_bad_delegation(state->inode);
 304                         nfs4_schedule_stateid_recovery(server, state);
 305                         goto wait_on_recovery;
 306                 case -NFS4ERR_EXPIRED:
 307                         if (state != NULL)
 308                                 nfs4_schedule_stateid_recovery(server, state);
 309                 case -NFS4ERR_STALE_STATEID:
 310                 case -NFS4ERR_STALE_CLIENTID:
 311                         nfs4_schedule_lease_recovery(clp);
 312                         goto wait_on_recovery;
 313 #if defined(CONFIG_NFS_V4_1)
 314                 case -NFS4ERR_BADSESSION:
 315                 case -NFS4ERR_BADSLOT:
 316                 case -NFS4ERR_BAD_HIGH_SLOT:
 317                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 318                 case -NFS4ERR_DEADSESSION:
 319                 case -NFS4ERR_SEQ_FALSE_RETRY:
 320                 case -NFS4ERR_SEQ_MISORDERED:
 321                         dprintk("%s ERROR: %d Reset session\n", __func__,
 322                                 errorcode);
 323                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 324                         goto wait_on_recovery;
 325 #endif /* defined(CONFIG_NFS_V4_1) */
 326                 case -NFS4ERR_FILE_OPEN:
 327                         if (exception->timeout > HZ) {
 328                                 /* We have retried a decent amount, time to
 329                                  * fail
 330                                  */
 331                                 ret = -EBUSY;
 332                                 break;
 333                         }
 334                 case -NFS4ERR_GRACE:
 335                 case -NFS4ERR_DELAY:
 336                         ret = nfs4_delay(server->client, &exception->timeout);
 337                         if (ret != 0)
 338                                 break;
 339                 case -NFS4ERR_RETRY_UNCACHED_REP:
 340                 case -NFS4ERR_OLD_STATEID:
 341                         exception->retry = 1;
 342                         break;
 343                 case -NFS4ERR_BADOWNER:
 344                         /* The following works around a Linux server bug! */
 345                 case -NFS4ERR_BADNAME:
 346                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 347                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 348                                 exception->retry = 1;
 349                                 printk(KERN_WARNING "NFS: v4 server %s "
 350                                                 "does not accept raw "
 351                                                 "uid/gids. "
 352                                                 "Reenabling the idmapper.\n",
 353                                                 server->nfs_client->cl_hostname);
 354                         }
 355         }
 356         /* We failed to handle the error */
 357         return nfs4_map_errors(ret);
 358 wait_on_recovery:
 359         ret = nfs4_wait_clnt_recover(clp);
 360         if (ret == 0)
 361                 exception->retry = 1;
 362         return ret;
 363 }
 364
 365
 366 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 367 {
 368         spin_lock(&clp->cl_lock);
 369         if (time_before(clp->cl_last_renewal,timestamp))
 370                 clp->cl_last_renewal = timestamp;
 371         spin_unlock(&clp->cl_lock);
 372 }
 373
 374 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 375 {
 376         do_renew_lease(server->nfs_client, timestamp);
 377 }
 378
 379 #if defined(CONFIG_NFS_V4_1)
 380
 381 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 382 {
 383         struct nfs4_session *session;
 384         struct nfs4_slot_table *tbl;
 385         bool send_new_highest_used_slotid = false;
 386
 387         if (!res->sr_slot) {
 388                 /* just wake up the next guy waiting since
 389                  * we may have not consumed a slot after all */
 390                 dprintk("%s: No slot\n", __func__);
 391                 return;
 392         }
 393         tbl = res->sr_slot->table;
 394         session = tbl->session;
 395
 396         spin_lock(&tbl->slot_tbl_lock);
 397         /* Be nice to the server: try to ensure that the last transmitted
 398          * value for highest_user_slotid <= target_highest_slotid
 399          */
 400         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 401                 send_new_highest_used_slotid = true;
 402
 403         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 404                 send_new_highest_used_slotid = false;
 405                 goto out_unlock;
 406         }
 407         nfs4_free_slot(tbl, res->sr_slot);
 408
 409         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 410                 send_new_highest_used_slotid = false;
 411 out_unlock:
 412         spin_unlock(&tbl->slot_tbl_lock);
 413         res->sr_slot = NULL;
 414         if (send_new_highest_used_slotid)
 415                 nfs41_server_notify_highest_slotid_update(session->clp);
 416 }
 417
 418 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 419 {
 420         struct nfs4_session *session;
 421         struct nfs4_slot *slot;
 422         unsigned long timestamp;
 423         struct nfs_client *clp;
 424         int ret = 1;
 425
 426         /*
 427          * sr_status remains 1 if an RPC level error occurred. The server
 428          * may or may not have processed the sequence operation..
 429          * Proceed as if the server received and processed the sequence
 430          * operation.
 431          */
 432         if (res->sr_status == 1)
 433                 res->sr_status = NFS_OK;
 434
 435         /* don't increment the sequence number if the task wasn't sent */
 436         if (!RPC_WAS_SENT(task))
 437                 goto out;
 438
 439         slot = res->sr_slot;
 440         session = slot->table->session;
 441
 442         /* Check the SEQUENCE operation status */
 443         switch (res->sr_status) {
 444         case 0:
 445                 /* Update the slot's sequence and clientid lease timer */
 446                 ++slot->seq_nr;
 447                 timestamp = slot->renewal_time;
 448                 clp = session->clp;
 449                 do_renew_lease(clp, timestamp);
 450                 /* Check sequence flags */
 451                 if (res->sr_status_flags != 0)
 452                         nfs4_schedule_lease_recovery(clp);
 453                 nfs41_update_target_slotid(slot->table, slot, res);
 454                 break;
 455         case -NFS4ERR_DELAY:
 456                 /* The server detected a resend of the RPC call and
 457                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 458                  * of RFC5661.
 459                  */
 460                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 461                         __func__,
 462                         slot->slot_nr,
 463                         slot->seq_nr);
 464                 goto out_retry;
 465         case -NFS4ERR_BADSLOT:
 466                 /*
 467                  * The slot id we used was probably retired. Try again
 468                  * using a different slot id.
 469                  */
 470                 goto retry_nowait;
 471         case -NFS4ERR_SEQ_MISORDERED:
 472                 /*
 473                  * Could this slot have been previously retired?
 474                  * If so, then the server may be expecting seq_nr = 1!
 475                  */
 476                 if (slot->seq_nr == 1)
 477                         break;
 478                 slot->seq_nr = 1;
 479                 goto retry_nowait;
 480         case -NFS4ERR_SEQ_FALSE_RETRY:
 481                 ++slot->seq_nr;
 482                 goto retry_nowait;
 483         default:
 484                 /* Just update the slot sequence no. */
 485                 ++slot->seq_nr;
 486         }
 487 out:
 488         /* The session may be reset by one of the error handlers. */
 489         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 490         nfs41_sequence_free_slot(res);
 491         return ret;
 492 retry_nowait:
 493         if (rpc_restart_call_prepare(task)) {
 494                 task->tk_status = 0;
 495                 ret = 0;
 496         }
 497         goto out;
 498 out_retry:
 499         if (!rpc_restart_call(task))
 500                 goto out;
 501         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 502         return 0;
 503 }
 504
 505 static int nfs4_sequence_done(struct rpc_task *task,
 506                                struct nfs4_sequence_res *res)
 507 {
 508         if (res->sr_slot == NULL)
 509                 return 1;
 510         return nfs41_sequence_done(task, res);
 511 }
 512
 513 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 514                 struct nfs4_sequence_res *res, int cache_reply)
 515 {
 516         args->sa_slot = NULL;
 517         args->sa_cache_this = 0;
 518         args->sa_privileged = 0;
 519         if (cache_reply)
 520                 args->sa_cache_this = 1;
 521         res->sr_slot = NULL;
 522 }
 523
 524 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 525 {
 526         args->sa_privileged = 1;
 527 }
 528
 529 int nfs41_setup_sequence(struct nfs4_session *session,
 530                                 struct nfs4_sequence_args *args,
 531                                 struct nfs4_sequence_res *res,
 532                                 struct rpc_task *task)
 533 {
 534         struct nfs4_slot *slot;
 535         struct nfs4_slot_table *tbl;
 536
 537         dprintk("--> %s\n", __func__);
 538         /* slot already allocated? */
 539         if (res->sr_slot != NULL)
 540                 goto out_success;
 541
 542         tbl = &session->fc_slot_table;
 543
 544         task->tk_timeout = 0;
 545
 546         spin_lock(&tbl->slot_tbl_lock);
 547         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 548             !args->sa_privileged) {
 549                 /* The state manager will wait until the slot table is empty */
 550                 dprintk("%s session is draining\n", __func__);
 551                 goto out_sleep;
 552         }
 553
 554         slot = nfs4_alloc_slot(tbl);
 555         if (IS_ERR(slot)) {
 556                 /* If out of memory, try again in 1/4 second */
 557                 if (slot == ERR_PTR(-ENOMEM))
 558                         task->tk_timeout = HZ >> 2;
 559                 dprintk("<-- %s: no free slots\n", __func__);
 560                 goto out_sleep;
 561         }
 562         spin_unlock(&tbl->slot_tbl_lock);
 563
 564         args->sa_slot = slot;
 565
 566         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 567                         slot->slot_nr, slot->seq_nr);
 568
 569         res->sr_slot = slot;
 570         res->sr_status_flags = 0;
 571         /*
 572          * sr_status is only set in decode_sequence, and so will remain
 573          * set to 1 if an rpc level failure occurs.
 574          */
 575         res->sr_status = 1;
 576 out_success:
 577         rpc_call_start(task);
 578         return 0;
 579 out_sleep:
 580         /* Privileged tasks are queued with top priority */
 581         if (args->sa_privileged)
 582                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 583                                 NULL, RPC_PRIORITY_PRIVILEGED);
 584         else
 585                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 586         spin_unlock(&tbl->slot_tbl_lock);
 587         return -EAGAIN;
 588 }
 589 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 590
 591 int nfs4_setup_sequence(const struct nfs_server *server,
 592                         struct nfs4_sequence_args *args,
 593                         struct nfs4_sequence_res *res,
 594                         struct rpc_task *task)
 595 {
 596         struct nfs4_session *session = nfs4_get_session(server);
 597         int ret = 0;
 598
 599         if (session == NULL) {
 600                 rpc_call_start(task);
 601                 goto out;
 602         }
 603
 604         dprintk("--> %s clp %p session %p sr_slot %d\n",
 605                 __func__, session->clp, session, res->sr_slot ?
 606                         res->sr_slot->slot_nr : -1);
 607
 608         ret = nfs41_setup_sequence(session, args, res, task);
 609 out:
 610         dprintk("<-- %s status=%d\n", __func__, ret);
 611         return ret;
 612 }
 613
 614 struct nfs41_call_sync_data {
 615         const struct nfs_server *seq_server;
 616         struct nfs4_sequence_args *seq_args;
 617         struct nfs4_sequence_res *seq_res;
 618 };
 619
 620 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 621 {
 622         struct nfs41_call_sync_data *data = calldata;
 623         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 624
 625         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 626
 627         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 628 }
 629
 630 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 631 {
 632         struct nfs41_call_sync_data *data = calldata;
 633
 634         nfs41_sequence_done(task, data->seq_res);
 635 }
 636
 637 static const struct rpc_call_ops nfs41_call_sync_ops = {
 638         .rpc_call_prepare = nfs41_call_sync_prepare,
 639         .rpc_call_done = nfs41_call_sync_done,
 640 };
 641
 642 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 643                                    struct nfs_server *server,
 644                                    struct rpc_message *msg,
 645                                    struct nfs4_sequence_args *args,
 646                                    struct nfs4_sequence_res *res)
 647 {
 648         int ret;
 649         struct rpc_task *task;
 650         struct nfs41_call_sync_data data = {
 651                 .seq_server = server,
 652                 .seq_args = args,
 653                 .seq_res = res,
 654         };
 655         struct rpc_task_setup task_setup = {
 656                 .rpc_client = clnt,
 657                 .rpc_message = msg,
 658                 .callback_ops = &nfs41_call_sync_ops,
 659                 .callback_data = &data
 660         };
 661
 662         task = rpc_run_task(&task_setup);
 663         if (IS_ERR(task))
 664                 ret = PTR_ERR(task);
 665         else {
 666                 ret = task->tk_status;
 667                 rpc_put_task(task);
 668         }
 669         return ret;
 670 }
 671
 672 #else
 673 static
 674 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 675                 struct nfs4_sequence_res *res, int cache_reply)
 676 {
 677 }
 678
 679 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 680 {
 681 }
 682
 683
 684 static int nfs4_sequence_done(struct rpc_task *task,
 685                                struct nfs4_sequence_res *res)
 686 {
 687         return 1;
 688 }
 689 #endif /* CONFIG_NFS_V4_1 */
 690
 691 static
 692 int _nfs4_call_sync(struct rpc_clnt *clnt,
 693                     struct nfs_server *server,
 694                     struct rpc_message *msg,
 695                     struct nfs4_sequence_args *args,
 696                     struct nfs4_sequence_res *res)
 697 {
 698         return rpc_call_sync(clnt, msg, 0);
 699 }
 700
 701 static
 702 int nfs4_call_sync(struct rpc_clnt *clnt,
 703                    struct nfs_server *server,
 704                    struct rpc_message *msg,
 705                    struct nfs4_sequence_args *args,
 706                    struct nfs4_sequence_res *res,
 707                    int cache_reply)
 708 {
 709         nfs41_init_sequence(args, res, cache_reply);
 710         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 711                                                 args, res);
 712 }
 713
 714 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 715 {
 716         struct nfs_inode *nfsi = NFS_I(dir);
 717
 718         spin_lock(&dir->i_lock);
 719         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 720         if (!cinfo->atomic || cinfo->before != dir->i_version)
 721                 nfs_force_lookup_revalidate(dir);
 722         dir->i_version = cinfo->after;
 723         spin_unlock(&dir->i_lock);
 724 }
 725
 726 struct nfs4_opendata {
 727         struct kref kref;
 728         struct nfs_openargs o_arg;
 729         struct nfs_openres o_res;
 730         struct nfs_open_confirmargs c_arg;
 731         struct nfs_open_confirmres c_res;
 732         struct nfs4_string owner_name;
 733         struct nfs4_string group_name;
 734         struct nfs_fattr f_attr;
 735         struct dentry *dir;
 736         struct dentry *dentry;
 737         struct nfs4_state_owner *owner;
 738         struct nfs4_state *state;
 739         struct iattr attrs;
 740         unsigned long timestamp;
 741         unsigned int rpc_done : 1;
 742         int rpc_status;
 743         int cancelled;
 744 };
 745
 746
 747 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 748 {
 749         p->o_res.f_attr = &p->f_attr;
 750         p->o_res.seqid = p->o_arg.seqid;
 751         p->c_res.seqid = p->c_arg.seqid;
 752         p->o_res.server = p->o_arg.server;
 753         p->o_res.access_request = p->o_arg.access;
 754         nfs_fattr_init(&p->f_attr);
 755         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 756 }
 757
 758 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 759                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 760                 const struct iattr *attrs,
 761                 gfp_t gfp_mask)
 762 {
 763         struct dentry *parent = dget_parent(dentry);
 764         struct inode *dir = parent->d_inode;
 765         struct nfs_server *server = NFS_SERVER(dir);
 766         struct nfs4_opendata *p;
 767
 768         p = kzalloc(sizeof(*p), gfp_mask);
 769         if (p == NULL)
 770                 goto err;
 771         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 772         if (p->o_arg.seqid == NULL)
 773                 goto err_free;
 774         nfs_sb_active(dentry->d_sb);
 775         p->dentry = dget(dentry);
 776         p->dir = parent;
 777         p->owner = sp;
 778         atomic_inc(&sp->so_count);
 779         p->o_arg.fh = NFS_FH(dir);
 780         p->o_arg.open_flags = flags;
 781         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 782         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 783          * will return permission denied for all bits until close */
 784         if (!(flags & O_EXCL)) {
 785                 /* ask server to check for all possible rights as results
 786                  * are cached */
 787                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 788                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 789         }
 790         p->o_arg.clientid = server->nfs_client->cl_clientid;
 791         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 792         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 793         p->o_arg.name = &dentry->d_name;
 794         p->o_arg.server = server;
 795         p->o_arg.bitmask = server->attr_bitmask;
 796         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 797         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 798         if (attrs != NULL && attrs->ia_valid != 0) {
 799                 __be32 verf[2];
 800
 801                 p->o_arg.u.attrs = &p->attrs;
 802                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 803
 804                 verf[0] = jiffies;
 805                 verf[1] = current->pid;
 806                 memcpy(p->o_arg.u.verifier.data, verf,
 807                                 sizeof(p->o_arg.u.verifier.data));
 808         }
 809         p->c_arg.fh = &p->o_res.fh;
 810         p->c_arg.stateid = &p->o_res.stateid;
 811         p->c_arg.seqid = p->o_arg.seqid;
 812         nfs4_init_opendata_res(p);
 813         kref_init(&p->kref);
 814         return p;
 815 err_free:
 816         kfree(p);
 817 err:
 818         dput(parent);
 819         return NULL;
 820 }
 821
 822 static void nfs4_opendata_free(struct kref *kref)
 823 {
 824         struct nfs4_opendata *p = container_of(kref,
 825                         struct nfs4_opendata, kref);
 826         struct super_block *sb = p->dentry->d_sb;
 827
 828         nfs_free_seqid(p->o_arg.seqid);
 829         if (p->state != NULL)
 830                 nfs4_put_open_state(p->state);
 831         nfs4_put_state_owner(p->owner);
 832         dput(p->dir);
 833         dput(p->dentry);
 834         nfs_sb_deactive(sb);
 835         nfs_fattr_free_names(&p->f_attr);
 836         kfree(p);
 837 }
 838
 839 static void nfs4_opendata_put(struct nfs4_opendata *p)
 840 {
 841         if (p != NULL)
 842                 kref_put(&p->kref, nfs4_opendata_free);
 843 }
 844
 845 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 846 {
 847         int ret;
 848
 849         ret = rpc_wait_for_completion_task(task);
 850         return ret;
 851 }
 852
 853 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 854 {
 855         int ret = 0;
 856
 857         if (open_mode & (O_EXCL|O_TRUNC))
 858                 goto out;
 859         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 860                 case FMODE_READ:
 861                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 862                                 && state->n_rdonly != 0;
 863                         break;
 864                 case FMODE_WRITE:
 865                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 866                                 && state->n_wronly != 0;
 867                         break;
 868                 case FMODE_READ|FMODE_WRITE:
 869                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 870                                 && state->n_rdwr != 0;
 871         }
 872 out:
 873         return ret;
 874 }
 875
 876 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 877 {
 878         if (delegation == NULL)
 879                 return 0;
 880         if ((delegation->type & fmode) != fmode)
 881                 return 0;
 882         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 883                 return 0;
 884         nfs_mark_delegation_referenced(delegation);
 885         return 1;
 886 }
 887
 888 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 889 {
 890         switch (fmode) {
 891                 case FMODE_WRITE:
 892                         state->n_wronly++;
 893                         break;
 894                 case FMODE_READ:
 895                         state->n_rdonly++;
 896                         break;
 897                 case FMODE_READ|FMODE_WRITE:
 898                         state->n_rdwr++;
 899         }
 900         nfs4_state_set_mode_locked(state, state->state | fmode);
 901 }
 902
 903 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 904 {
 905         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 906                 nfs4_stateid_copy(&state->stateid, stateid);
 907         nfs4_stateid_copy(&state->open_stateid, stateid);
 908         switch (fmode) {
 909                 case FMODE_READ:
 910                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 911                         break;
 912                 case FMODE_WRITE:
 913                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 914                         break;
 915                 case FMODE_READ|FMODE_WRITE:
 916                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 917         }
 918 }
 919
 920 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 921 {
 922         write_seqlock(&state->seqlock);
 923         nfs_set_open_stateid_locked(state, stateid, fmode);
 924         write_sequnlock(&state->seqlock);
 925 }
 926
 927 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 928 {
 929         /*
 930          * Protect the call to nfs4_state_set_mode_locked and
 931          * serialise the stateid update
 932          */
 933         write_seqlock(&state->seqlock);
 934         if (deleg_stateid != NULL) {
 935                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 936                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 937         }
 938         if (open_stateid != NULL)
 939                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 940         write_sequnlock(&state->seqlock);
 941         spin_lock(&state->owner->so_lock);
 942         update_open_stateflags(state, fmode);
 943         spin_unlock(&state->owner->so_lock);
 944 }
 945
 946 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 947 {
 948         struct nfs_inode *nfsi = NFS_I(state->inode);
 949         struct nfs_delegation *deleg_cur;
 950         int ret = 0;
 951
 952         fmode &= (FMODE_READ|FMODE_WRITE);
 953
 954         rcu_read_lock();
 955         deleg_cur = rcu_dereference(nfsi->delegation);
 956         if (deleg_cur == NULL)
 957                 goto no_delegation;
 958
 959         spin_lock(&deleg_cur->lock);
 960         if (nfsi->delegation != deleg_cur ||
 961             (deleg_cur->type & fmode) != fmode)
 962                 goto no_delegation_unlock;
 963
 964         if (delegation == NULL)
 965                 delegation = &deleg_cur->stateid;
 966         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 967                 goto no_delegation_unlock;
 968
 969         nfs_mark_delegation_referenced(deleg_cur);
 970         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 971         ret = 1;
 972 no_delegation_unlock:
 973         spin_unlock(&deleg_cur->lock);
 974 no_delegation:
 975         rcu_read_unlock();
 976
 977         if (!ret && open_stateid != NULL) {
 978                 __update_open_stateid(state, open_stateid, NULL, fmode);
 979                 ret = 1;
 980         }
 981
 982         return ret;
 983 }
 984
 985
 986 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 987 {
 988         struct nfs_delegation *delegation;
 989
 990         rcu_read_lock();
 991         delegation = rcu_dereference(NFS_I(inode)->delegation);
 992         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 993                 rcu_read_unlock();
 994                 return;
 995         }
 996         rcu_read_unlock();
 997         nfs4_inode_return_delegation(inode);
 998 }
 999
1000 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1001 {
1002         struct nfs4_state *state = opendata->state;
1003         struct nfs_inode *nfsi = NFS_I(state->inode);
1004         struct nfs_delegation *delegation;
1005         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1006         fmode_t fmode = opendata->o_arg.fmode;
1007         nfs4_stateid stateid;
1008         int ret = -EAGAIN;
1009
1010         for (;;) {
1011                 if (can_open_cached(state, fmode, open_mode)) {
1012                         spin_lock(&state->owner->so_lock);
1013                         if (can_open_cached(state, fmode, open_mode)) {
1014                                 update_open_stateflags(state, fmode);
1015                                 spin_unlock(&state->owner->so_lock);
1016                                 goto out_return_state;
1017                         }
1018                         spin_unlock(&state->owner->so_lock);
1019                 }
1020                 rcu_read_lock();
1021                 delegation = rcu_dereference(nfsi->delegation);
1022                 if (!can_open_delegated(delegation, fmode)) {
1023                         rcu_read_unlock();
1024                         break;
1025                 }
1026                 /* Save the delegation */
1027                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1028                 rcu_read_unlock();
1029                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1030                 if (ret != 0)
1031                         goto out;
1032                 ret = -EAGAIN;
1033
1034                 /* Try to update the stateid using the delegation */
1035                 if (update_open_stateid(state, NULL, &stateid, fmode))
1036                         goto out_return_state;
1037         }
1038 out:
1039         return ERR_PTR(ret);
1040 out_return_state:
1041         atomic_inc(&state->count);
1042         return state;
1043 }
1044
1045 static void
1046 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1047 {
1048         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1049         struct nfs_delegation *delegation;
1050         int delegation_flags = 0;
1051
1052         rcu_read_lock();
1053         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1054         if (delegation)
1055                 delegation_flags = delegation->flags;
1056         rcu_read_unlock();
1057         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1058                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1059                                    "returning a delegation for "
1060                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1061                                    clp->cl_hostname);
1062         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1063                 nfs_inode_set_delegation(state->inode,
1064                                          data->owner->so_cred,
1065                                          &data->o_res);
1066         else
1067                 nfs_inode_reclaim_delegation(state->inode,
1068                                              data->owner->so_cred,
1069                                              &data->o_res);
1070 }
1071
1072 /*
1073  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1074  * and update the nfs4_state.
1075  */
1076 static struct nfs4_state *
1077 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1078 {
1079         struct inode *inode = data->state->inode;
1080         struct nfs4_state *state = data->state;
1081         int ret;
1082
1083         if (!data->rpc_done) {
1084                 ret = data->rpc_status;
1085                 goto err;
1086         }
1087
1088         ret = -ESTALE;
1089         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1090             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1091             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1092                 goto err;
1093
1094         ret = -ENOMEM;
1095         state = nfs4_get_open_state(inode, data->owner);
1096         if (state == NULL)
1097                 goto err;
1098
1099         ret = nfs_refresh_inode(inode, &data->f_attr);
1100         if (ret)
1101                 goto err;
1102
1103         if (data->o_res.delegation_type != 0)
1104                 nfs4_opendata_check_deleg(data, state);
1105         update_open_stateid(state, &data->o_res.stateid, NULL,
1106                             data->o_arg.fmode);
1107
1108         return state;
1109 err:
1110         return ERR_PTR(ret);
1111
1112 }
1113
1114 static struct nfs4_state *
1115 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1116 {
1117         struct inode *inode;
1118         struct nfs4_state *state = NULL;
1119         int ret;
1120
1121         if (!data->rpc_done) {
1122                 state = nfs4_try_open_cached(data);
1123                 goto out;
1124         }
1125
1126         ret = -EAGAIN;
1127         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1128                 goto err;
1129         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1130         ret = PTR_ERR(inode);
1131         if (IS_ERR(inode))
1132                 goto err;
1133         ret = -ENOMEM;
1134         state = nfs4_get_open_state(inode, data->owner);
1135         if (state == NULL)
1136                 goto err_put_inode;
1137         if (data->o_res.delegation_type != 0)
1138                 nfs4_opendata_check_deleg(data, state);
1139         update_open_stateid(state, &data->o_res.stateid, NULL,
1140                         data->o_arg.fmode);
1141         iput(inode);
1142 out:
1143         return state;
1144 err_put_inode:
1145         iput(inode);
1146 err:
1147         return ERR_PTR(ret);
1148 }
1149
1150 static struct nfs4_state *
1151 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1152 {
1153         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1154                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1155         return _nfs4_opendata_to_nfs4_state(data);
1156 }
1157
1158 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1159 {
1160         struct nfs_inode *nfsi = NFS_I(state->inode);
1161         struct nfs_open_context *ctx;
1162
1163         spin_lock(&state->inode->i_lock);
1164         list_for_each_entry(ctx, &nfsi->open_files, list) {
1165                 if (ctx->state != state)
1166                         continue;
1167                 get_nfs_open_context(ctx);
1168                 spin_unlock(&state->inode->i_lock);
1169                 return ctx;
1170         }
1171         spin_unlock(&state->inode->i_lock);
1172         return ERR_PTR(-ENOENT);
1173 }
1174
1175 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1176 {
1177         struct nfs4_opendata *opendata;
1178
1179         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1180         if (opendata == NULL)
1181                 return ERR_PTR(-ENOMEM);
1182         opendata->state = state;
1183         atomic_inc(&state->count);
1184         return opendata;
1185 }
1186
1187 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1188 {
1189         struct nfs4_state *newstate;
1190         int ret;
1191
1192         opendata->o_arg.open_flags = 0;
1193         opendata->o_arg.fmode = fmode;
1194         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1195         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1196         nfs4_init_opendata_res(opendata);
1197         ret = _nfs4_recover_proc_open(opendata);
1198         if (ret != 0)
1199                 return ret;
1200         newstate = nfs4_opendata_to_nfs4_state(opendata);
1201         if (IS_ERR(newstate))
1202                 return PTR_ERR(newstate);
1203         nfs4_close_state(newstate, fmode);
1204         *res = newstate;
1205         return 0;
1206 }
1207
1208 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1209 {
1210         struct nfs4_state *newstate;
1211         int ret;
1212
1213         /* memory barrier prior to reading state->n_* */
1214         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1215         smp_rmb();
1216         if (state->n_rdwr != 0) {
1217                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1218                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1219                 if (ret != 0)
1220                         return ret;
1221                 if (newstate != state)
1222                         return -ESTALE;
1223         }
1224         if (state->n_wronly != 0) {
1225                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1226                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1227                 if (ret != 0)
1228                         return ret;
1229                 if (newstate != state)
1230                         return -ESTALE;
1231         }
1232         if (state->n_rdonly != 0) {
1233                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1234                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1235                 if (ret != 0)
1236                         return ret;
1237                 if (newstate != state)
1238                         return -ESTALE;
1239         }
1240         /*
1241          * We may have performed cached opens for all three recoveries.
1242          * Check if we need to update the current stateid.
1243          */
1244         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1245             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1246                 write_seqlock(&state->seqlock);
1247                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1248                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1249                 write_sequnlock(&state->seqlock);
1250         }
1251         return 0;
1252 }
1253
1254 /*
1255  * OPEN_RECLAIM:
1256  *      reclaim state on the server after a reboot.
1257  */
1258 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1259 {
1260         struct nfs_delegation *delegation;
1261         struct nfs4_opendata *opendata;
1262         fmode_t delegation_type = 0;
1263         int status;
1264
1265         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1266         if (IS_ERR(opendata))
1267                 return PTR_ERR(opendata);
1268         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1269         opendata->o_arg.fh = NFS_FH(state->inode);
1270         rcu_read_lock();
1271         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1272         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1273                 delegation_type = delegation->type;
1274         rcu_read_unlock();
1275         opendata->o_arg.u.delegation_type = delegation_type;
1276         status = nfs4_open_recover(opendata, state);
1277         nfs4_opendata_put(opendata);
1278         return status;
1279 }
1280
1281 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1282 {
1283         struct nfs_server *server = NFS_SERVER(state->inode);
1284         struct nfs4_exception exception = { };
1285         int err;
1286         do {
1287                 err = _nfs4_do_open_reclaim(ctx, state);
1288                 if (err != -NFS4ERR_DELAY)
1289                         break;
1290                 nfs4_handle_exception(server, err, &exception);
1291         } while (exception.retry);
1292         return err;
1293 }
1294
1295 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1296 {
1297         struct nfs_open_context *ctx;
1298         int ret;
1299
1300         ctx = nfs4_state_find_open_context(state);
1301         if (IS_ERR(ctx))
1302                 return PTR_ERR(ctx);
1303         ret = nfs4_do_open_reclaim(ctx, state);
1304         put_nfs_open_context(ctx);
1305         return ret;
1306 }
1307
1308 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1309 {
1310         struct nfs4_opendata *opendata;
1311         int ret;
1312
1313         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1314         if (IS_ERR(opendata))
1315                 return PTR_ERR(opendata);
1316         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1317         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1318         ret = nfs4_open_recover(opendata, state);
1319         nfs4_opendata_put(opendata);
1320         return ret;
1321 }
1322
1323 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1324 {
1325         struct nfs4_exception exception = { };
1326         struct nfs_server *server = NFS_SERVER(state->inode);
1327         int err;
1328         do {
1329                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1330                 switch (err) {
1331                         case 0:
1332                         case -ENOENT:
1333                         case -ESTALE:
1334                                 goto out;
1335                         case -NFS4ERR_BADSESSION:
1336                         case -NFS4ERR_BADSLOT:
1337                         case -NFS4ERR_BAD_HIGH_SLOT:
1338                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1339                         case -NFS4ERR_DEADSESSION:
1340                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1341                                 goto out;
1342                         case -NFS4ERR_STALE_CLIENTID:
1343                         case -NFS4ERR_STALE_STATEID:
1344                         case -NFS4ERR_EXPIRED:
1345                                 /* Don't recall a delegation if it was lost */
1346                                 nfs4_schedule_lease_recovery(server->nfs_client);
1347                                 goto out;
1348                         case -ERESTARTSYS:
1349                                 /*
1350                                  * The show must go on: exit, but mark the
1351                                  * stateid as needing recovery.
1352                                  */
1353                         case -NFS4ERR_DELEG_REVOKED:
1354                         case -NFS4ERR_ADMIN_REVOKED:
1355                         case -NFS4ERR_BAD_STATEID:
1356                                 nfs_inode_find_state_and_recover(state->inode,
1357                                                 stateid);
1358                                 nfs4_schedule_stateid_recovery(server, state);
1359                         case -ENOMEM:
1360                                 err = 0;
1361                                 goto out;
1362                 }
1363                 err = nfs4_handle_exception(server, err, &exception);
1364         } while (exception.retry);
1365 out:
1366         return err;
1367 }
1368
1369 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1370 {
1371         struct nfs4_opendata *data = calldata;
1372
1373         data->rpc_status = task->tk_status;
1374         if (data->rpc_status == 0) {
1375                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1376                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1377                 renew_lease(data->o_res.server, data->timestamp);
1378                 data->rpc_done = 1;
1379         }
1380 }
1381
1382 static void nfs4_open_confirm_release(void *calldata)
1383 {
1384         struct nfs4_opendata *data = calldata;
1385         struct nfs4_state *state = NULL;
1386
1387         /* If this request hasn't been cancelled, do nothing */
1388         if (data->cancelled == 0)
1389                 goto out_free;
1390         /* In case of error, no cleanup! */
1391         if (!data->rpc_done)
1392                 goto out_free;
1393         state = nfs4_opendata_to_nfs4_state(data);
1394         if (!IS_ERR(state))
1395                 nfs4_close_state(state, data->o_arg.fmode);
1396 out_free:
1397         nfs4_opendata_put(data);
1398 }
1399
1400 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1401         .rpc_call_done = nfs4_open_confirm_done,
1402         .rpc_release = nfs4_open_confirm_release,
1403 };
1404
1405 /*
1406  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1407  */
1408 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1409 {
1410         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1411         struct rpc_task *task;
1412         struct  rpc_message msg = {
1413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1414                 .rpc_argp = &data->c_arg,
1415                 .rpc_resp = &data->c_res,
1416                 .rpc_cred = data->owner->so_cred,
1417         };
1418         struct rpc_task_setup task_setup_data = {
1419                 .rpc_client = server->client,
1420                 .rpc_message = &msg,
1421                 .callback_ops = &nfs4_open_confirm_ops,
1422                 .callback_data = data,
1423                 .workqueue = nfsiod_workqueue,
1424                 .flags = RPC_TASK_ASYNC,
1425         };
1426         int status;
1427
1428         kref_get(&data->kref);
1429         data->rpc_done = 0;
1430         data->rpc_status = 0;
1431         data->timestamp = jiffies;
1432         task = rpc_run_task(&task_setup_data);
1433         if (IS_ERR(task))
1434                 return PTR_ERR(task);
1435         status = nfs4_wait_for_completion_rpc_task(task);
1436         if (status != 0) {
1437                 data->cancelled = 1;
1438                 smp_wmb();
1439         } else
1440                 status = data->rpc_status;
1441         rpc_put_task(task);
1442         return status;
1443 }
1444
1445 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1446 {
1447         struct nfs4_opendata *data = calldata;
1448         struct nfs4_state_owner *sp = data->owner;
1449
1450         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1451                 return;
1452         /*
1453          * Check if we still need to send an OPEN call, or if we can use
1454          * a delegation instead.
1455          */
1456         if (data->state != NULL) {
1457                 struct nfs_delegation *delegation;
1458
1459                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1460                         goto out_no_action;
1461                 rcu_read_lock();
1462                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1463                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1464                     can_open_delegated(delegation, data->o_arg.fmode))
1465                         goto unlock_no_action;
1466                 rcu_read_unlock();
1467         }
1468         /* Update client id. */
1469         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1470         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1471                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1472                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1473                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1474         }
1475         data->timestamp = jiffies;
1476         if (nfs4_setup_sequence(data->o_arg.server,
1477                                 &data->o_arg.seq_args,
1478                                 &data->o_res.seq_res,
1479                                 task) != 0)
1480                 nfs_release_seqid(data->o_arg.seqid);
1481         return;
1482 unlock_no_action:
1483         rcu_read_unlock();
1484 out_no_action:
1485         task->tk_action = NULL;
1486         nfs4_sequence_done(task, &data->o_res.seq_res);
1487 }
1488
1489 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1490 {
1491         struct nfs4_opendata *data = calldata;
1492
1493         data->rpc_status = task->tk_status;
1494
1495         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1496                 return;
1497
1498         if (task->tk_status == 0) {
1499                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1500                         switch (data->o_res.f_attr->mode & S_IFMT) {
1501                         case S_IFREG:
1502                                 break;
1503                         case S_IFLNK:
1504                                 data->rpc_status = -ELOOP;
1505                                 break;
1506                         case S_IFDIR:
1507                                 data->rpc_status = -EISDIR;
1508                                 break;
1509                         default:
1510                                 data->rpc_status = -ENOTDIR;
1511                         }
1512                 }
1513                 renew_lease(data->o_res.server, data->timestamp);
1514                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1515                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1516         }
1517         data->rpc_done = 1;
1518 }
1519
1520 static void nfs4_open_release(void *calldata)
1521 {
1522         struct nfs4_opendata *data = calldata;
1523         struct nfs4_state *state = NULL;
1524
1525         /* If this request hasn't been cancelled, do nothing */
1526         if (data->cancelled == 0)
1527                 goto out_free;
1528         /* In case of error, no cleanup! */
1529         if (data->rpc_status != 0 || !data->rpc_done)
1530                 goto out_free;
1531         /* In case we need an open_confirm, no cleanup! */
1532         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1533                 goto out_free;
1534         state = nfs4_opendata_to_nfs4_state(data);
1535         if (!IS_ERR(state))
1536                 nfs4_close_state(state, data->o_arg.fmode);
1537 out_free:
1538         nfs4_opendata_put(data);
1539 }
1540
1541 static const struct rpc_call_ops nfs4_open_ops = {
1542         .rpc_call_prepare = nfs4_open_prepare,
1543         .rpc_call_done = nfs4_open_done,
1544         .rpc_release = nfs4_open_release,
1545 };
1546
1547 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1548 {
1549         struct inode *dir = data->dir->d_inode;
1550         struct nfs_server *server = NFS_SERVER(dir);
1551         struct nfs_openargs *o_arg = &data->o_arg;
1552         struct nfs_openres *o_res = &data->o_res;
1553         struct rpc_task *task;
1554         struct rpc_message msg = {
1555                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1556                 .rpc_argp = o_arg,
1557                 .rpc_resp = o_res,
1558                 .rpc_cred = data->owner->so_cred,
1559         };
1560         struct rpc_task_setup task_setup_data = {
1561                 .rpc_client = server->client,
1562                 .rpc_message = &msg,
1563                 .callback_ops = &nfs4_open_ops,
1564                 .callback_data = data,
1565                 .workqueue = nfsiod_workqueue,
1566                 .flags = RPC_TASK_ASYNC,
1567         };
1568         int status;
1569
1570         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1571         kref_get(&data->kref);
1572         data->rpc_done = 0;
1573         data->rpc_status = 0;
1574         data->cancelled = 0;
1575         if (isrecover)
1576                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1577         task = rpc_run_task(&task_setup_data);
1578         if (IS_ERR(task))
1579                 return PTR_ERR(task);
1580         status = nfs4_wait_for_completion_rpc_task(task);
1581         if (status != 0) {
1582                 data->cancelled = 1;
1583                 smp_wmb();
1584         } else
1585                 status = data->rpc_status;
1586         rpc_put_task(task);
1587
1588         return status;
1589 }
1590
1591 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1592 {
1593         struct inode *dir = data->dir->d_inode;
1594         struct nfs_openres *o_res = &data->o_res;
1595         int status;
1596
1597         status = nfs4_run_open_task(data, 1);
1598         if (status != 0 || !data->rpc_done)
1599                 return status;
1600
1601         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1602
1603         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1604                 status = _nfs4_proc_open_confirm(data);
1605                 if (status != 0)
1606                         return status;
1607         }
1608
1609         return status;
1610 }
1611
1612 static int nfs4_opendata_access(struct rpc_cred *cred,
1613                                 struct nfs4_opendata *opendata,
1614                                 struct nfs4_state *state, fmode_t fmode)
1615 {
1616         struct nfs_access_entry cache;
1617         u32 mask;
1618
1619         /* access call failed or for some reason the server doesn't
1620          * support any access modes -- defer access call until later */
1621         if (opendata->o_res.access_supported == 0)
1622                 return 0;
1623
1624         mask = 0;
1625         /* don't check MAY_WRITE - a newly created file may not have
1626          * write mode bits, but POSIX allows the creating process to write */
1627         if (fmode & FMODE_READ)
1628                 mask |= MAY_READ;
1629         if (fmode & FMODE_EXEC)
1630                 mask |= MAY_EXEC;
1631
1632         cache.cred = cred;
1633         cache.jiffies = jiffies;
1634         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1635         nfs_access_add_cache(state->inode, &cache);
1636
1637         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1638                 return 0;
1639
1640         /* even though OPEN succeeded, access is denied. Close the file */
1641         nfs4_close_state(state, fmode);
1642         return -EACCES;
1643 }
1644
1645 /*
1646  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1647  */
1648 static int _nfs4_proc_open(struct nfs4_opendata *data)
1649 {
1650         struct inode *dir = data->dir->d_inode;
1651         struct nfs_server *server = NFS_SERVER(dir);
1652         struct nfs_openargs *o_arg = &data->o_arg;
1653         struct nfs_openres *o_res = &data->o_res;
1654         int status;
1655
1656         status = nfs4_run_open_task(data, 0);
1657         if (!data->rpc_done)
1658                 return status;
1659         if (status != 0) {
1660                 if (status == -NFS4ERR_BADNAME &&
1661                                 !(o_arg->open_flags & O_CREAT))
1662                         return -ENOENT;
1663                 return status;
1664         }
1665
1666         nfs_fattr_map_and_free_names(server, &data->f_attr);
1667
1668         if (o_arg->open_flags & O_CREAT)
1669                 update_changeattr(dir, &o_res->cinfo);
1670         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1671                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1672         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1673                 status = _nfs4_proc_open_confirm(data);
1674                 if (status != 0)
1675                         return status;
1676         }
1677         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1678                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1679         return 0;
1680 }
1681
1682 static int nfs4_recover_expired_lease(struct nfs_server *server)
1683 {
1684         return nfs4_client_recover_expired_lease(server->nfs_client);
1685 }
1686
1687 /*
1688  * OPEN_EXPIRED:
1689  *      reclaim state on the server after a network partition.
1690  *      Assumes caller holds the appropriate lock
1691  */
1692 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1693 {
1694         struct nfs4_opendata *opendata;
1695         int ret;
1696
1697         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1698         if (IS_ERR(opendata))
1699                 return PTR_ERR(opendata);
1700         ret = nfs4_open_recover(opendata, state);
1701         if (ret == -ESTALE)
1702                 d_drop(ctx->dentry);
1703         nfs4_opendata_put(opendata);
1704         return ret;
1705 }
1706
1707 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1708 {
1709         struct nfs_server *server = NFS_SERVER(state->inode);
1710         struct nfs4_exception exception = { };
1711         int err;
1712
1713         do {
1714                 err = _nfs4_open_expired(ctx, state);
1715                 switch (err) {
1716                 default:
1717                         goto out;
1718                 case -NFS4ERR_GRACE:
1719                 case -NFS4ERR_DELAY:
1720                         nfs4_handle_exception(server, err, &exception);
1721                         err = 0;
1722                 }
1723         } while (exception.retry);
1724 out:
1725         return err;
1726 }
1727
1728 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1729 {
1730         struct nfs_open_context *ctx;
1731         int ret;
1732
1733         ctx = nfs4_state_find_open_context(state);
1734         if (IS_ERR(ctx))
1735                 return PTR_ERR(ctx);
1736         ret = nfs4_do_open_expired(ctx, state);
1737         put_nfs_open_context(ctx);
1738         return ret;
1739 }
1740
1741 #if defined(CONFIG_NFS_V4_1)
1742 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1743 {
1744         struct nfs_server *server = NFS_SERVER(state->inode);
1745         nfs4_stateid *stateid = &state->stateid;
1746         int status;
1747
1748         /* If a state reset has been done, test_stateid is unneeded */
1749         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1750                 return;
1751
1752         status = nfs41_test_stateid(server, stateid);
1753         if (status != NFS_OK) {
1754                 /* Free the stateid unless the server explicitly
1755                  * informs us the stateid is unrecognized. */
1756                 if (status != -NFS4ERR_BAD_STATEID)
1757                         nfs41_free_stateid(server, stateid);
1758                 nfs_remove_bad_delegation(state->inode);
1759
1760                 write_seqlock(&state->seqlock);
1761                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1762                 write_sequnlock(&state->seqlock);
1763                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1764         }
1765 }
1766
1767 /**
1768  * nfs41_check_open_stateid - possibly free an open stateid
1769  *
1770  * @state: NFSv4 state for an inode
1771  *
1772  * Returns NFS_OK if recovery for this stateid is now finished.
1773  * Otherwise a negative NFS4ERR value is returned.
1774  */
1775 static int nfs41_check_open_stateid(struct nfs4_state *state)
1776 {
1777         struct nfs_server *server = NFS_SERVER(state->inode);
1778         nfs4_stateid *stateid = &state->open_stateid;
1779         int status;
1780
1781         /* If a state reset has been done, test_stateid is unneeded */
1782         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1783             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1784             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1785                 return -NFS4ERR_BAD_STATEID;
1786
1787         status = nfs41_test_stateid(server, stateid);
1788         if (status != NFS_OK) {
1789                 /* Free the stateid unless the server explicitly
1790                  * informs us the stateid is unrecognized. */
1791                 if (status != -NFS4ERR_BAD_STATEID)
1792                         nfs41_free_stateid(server, stateid);
1793
1794                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1795                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1796                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1797         }
1798         return status;
1799 }
1800
1801 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1802 {
1803         int status;
1804
1805         nfs41_clear_delegation_stateid(state);
1806         status = nfs41_check_open_stateid(state);
1807         if (status != NFS_OK)
1808                 status = nfs4_open_expired(sp, state);
1809         return status;
1810 }
1811 #endif
1812
1813 /*
1814  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1815  * fields corresponding to attributes that were used to store the verifier.
1816  * Make sure we clobber those fields in the later setattr call
1817  */
1818 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1819 {
1820         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1821             !(sattr->ia_valid & ATTR_ATIME_SET))
1822                 sattr->ia_valid |= ATTR_ATIME;
1823
1824         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1825             !(sattr->ia_valid & ATTR_MTIME_SET))
1826                 sattr->ia_valid |= ATTR_MTIME;
1827 }
1828
1829 /*
1830  * Returns a referenced nfs4_state
1831  */
1832 static int _nfs4_do_open(struct inode *dir,
1833                         struct dentry *dentry,
1834                         fmode_t fmode,
1835                         int flags,
1836                         struct iattr *sattr,
1837                         struct rpc_cred *cred,
1838                         struct nfs4_state **res,
1839                         struct nfs4_threshold **ctx_th)
1840 {
1841         struct nfs4_state_owner  *sp;
1842         struct nfs4_state     *state = NULL;
1843         struct nfs_server       *server = NFS_SERVER(dir);
1844         struct nfs4_opendata *opendata;
1845         int status;
1846
1847         /* Protect against reboot recovery conflicts */
1848         status = -ENOMEM;
1849         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1850         if (sp == NULL) {
1851                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1852                 goto out_err;
1853         }
1854         status = nfs4_recover_expired_lease(server);
1855         if (status != 0)
1856                 goto err_put_state_owner;
1857         if (dentry->d_inode != NULL)
1858                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1859         status = -ENOMEM;
1860         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1861         if (opendata == NULL)
1862                 goto err_put_state_owner;
1863
1864         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1865                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1866                 if (!opendata->f_attr.mdsthreshold)
1867                         goto err_opendata_put;
1868                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1869         }
1870         if (dentry->d_inode != NULL)
1871                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1872
1873         status = _nfs4_proc_open(opendata);
1874         if (status != 0)
1875                 goto err_opendata_put;
1876
1877         state = nfs4_opendata_to_nfs4_state(opendata);
1878         status = PTR_ERR(state);
1879         if (IS_ERR(state))
1880                 goto err_opendata_put;
1881         if (server->caps & NFS_CAP_POSIX_LOCK)
1882                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1883
1884         status = nfs4_opendata_access(cred, opendata, state, fmode);
1885         if (status != 0)
1886                 goto err_opendata_put;
1887
1888         if (opendata->o_arg.open_flags & O_EXCL) {
1889                 nfs4_exclusive_attrset(opendata, sattr);
1890
1891                 nfs_fattr_init(opendata->o_res.f_attr);
1892                 status = nfs4_do_setattr(state->inode, cred,
1893                                 opendata->o_res.f_attr, sattr,
1894                                 state);
1895                 if (status == 0)
1896                         nfs_setattr_update_inode(state->inode, sattr);
1897                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1898         }
1899
1900         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1901                 *ctx_th = opendata->f_attr.mdsthreshold;
1902         else
1903                 kfree(opendata->f_attr.mdsthreshold);
1904         opendata->f_attr.mdsthreshold = NULL;
1905
1906         nfs4_opendata_put(opendata);
1907         nfs4_put_state_owner(sp);
1908         *res = state;
1909         return 0;
1910 err_opendata_put:
1911         kfree(opendata->f_attr.mdsthreshold);
1912         nfs4_opendata_put(opendata);
1913 err_put_state_owner:
1914         nfs4_put_state_owner(sp);
1915 out_err:
1916         *res = NULL;
1917         return status;
1918 }
1919
1920
1921 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1922                                         struct dentry *dentry,
1923                                         fmode_t fmode,
1924                                         int flags,
1925                                         struct iattr *sattr,
1926                                         struct rpc_cred *cred,
1927                                         struct nfs4_threshold **ctx_th)
1928 {
1929         struct nfs4_exception exception = { };
1930         struct nfs4_state *res;
1931         int status;
1932
1933         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1934         do {
1935                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1936                                        &res, ctx_th);
1937                 if (status == 0)
1938                         break;
1939                 /* NOTE: BAD_SEQID means the server and client disagree about the
1940                  * book-keeping w.r.t. state-changing operations
1941                  * (OPEN/CLOSE/LOCK/LOCKU...)
1942                  * It is actually a sign of a bug on the client or on the server.
1943                  *
1944                  * If we receive a BAD_SEQID error in the particular case of
1945                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1946                  * have unhashed the old state_owner for us, and that we can
1947                  * therefore safely retry using a new one. We should still warn
1948                  * the user though...
1949                  */
1950                 if (status == -NFS4ERR_BAD_SEQID) {
1951                         pr_warn_ratelimited("NFS: v4 server %s "
1952                                         " returned a bad sequence-id error!\n",
1953                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1954                         exception.retry = 1;
1955                         continue;
1956                 }
1957                 /*
1958                  * BAD_STATEID on OPEN means that the server cancelled our
1959                  * state before it received the OPEN_CONFIRM.
1960                  * Recover by retrying the request as per the discussion
1961                  * on Page 181 of RFC3530.
1962                  */
1963                 if (status == -NFS4ERR_BAD_STATEID) {
1964                         exception.retry = 1;
1965                         continue;
1966                 }
1967                 if (status == -EAGAIN) {
1968                         /* We must have found a delegation */
1969                         exception.retry = 1;
1970                         continue;
1971                 }
1972                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1973                                         status, &exception));
1974         } while (exception.retry);
1975         return res;
1976 }
1977
1978 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1979                             struct nfs_fattr *fattr, struct iattr *sattr,
1980                             struct nfs4_state *state)
1981 {
1982         struct nfs_server *server = NFS_SERVER(inode);
1983         struct nfs_setattrargs  arg = {
1984                 .fh             = NFS_FH(inode),
1985                 .iap            = sattr,
1986                 .server         = server,
1987                 .bitmask = server->attr_bitmask,
1988         };
1989         struct nfs_setattrres  res = {
1990                 .fattr          = fattr,
1991                 .server         = server,
1992         };
1993         struct rpc_message msg = {
1994                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1995                 .rpc_argp       = &arg,
1996                 .rpc_resp       = &res,
1997                 .rpc_cred       = cred,
1998         };
1999         unsigned long timestamp = jiffies;
2000         int status;
2001
2002         nfs_fattr_init(fattr);
2003
2004         if (state != NULL) {
2005                 struct nfs_lockowner lockowner = {
2006                         .l_owner = current->files,
2007                         .l_pid = current->tgid,
2008                 };
2009                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2010                                 &lockowner);
2011         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2012                                 FMODE_WRITE)) {
2013                 /* Use that stateid */
2014         } else
2015                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2016
2017         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2018         if (status == 0 && state != NULL)
2019                 renew_lease(server, timestamp);
2020         return status;
2021 }
2022
2023 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2024                            struct nfs_fattr *fattr, struct iattr *sattr,
2025                            struct nfs4_state *state)
2026 {
2027         struct nfs_server *server = NFS_SERVER(inode);
2028         struct nfs4_exception exception = {
2029                 .state = state,
2030                 .inode = inode,
2031         };
2032         int err;
2033         do {
2034                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2035                 switch (err) {
2036                 case -NFS4ERR_OPENMODE:
2037                         if (state && !(state->state & FMODE_WRITE)) {
2038                                 err = -EBADF;
2039                                 if (sattr->ia_valid & ATTR_OPEN)
2040                                         err = -EACCES;
2041                                 goto out;
2042                         }
2043                 }
2044                 err = nfs4_handle_exception(server, err, &exception);
2045         } while (exception.retry);
2046 out:
2047         return err;
2048 }
2049
2050 struct nfs4_closedata {
2051         struct inode *inode;
2052         struct nfs4_state *state;
2053         struct nfs_closeargs arg;
2054         struct nfs_closeres res;
2055         struct nfs_fattr fattr;
2056         unsigned long timestamp;
2057         bool roc;
2058         u32 roc_barrier;
2059 };
2060
2061 static void nfs4_free_closedata(void *data)
2062 {
2063         struct nfs4_closedata *calldata = data;
2064         struct nfs4_state_owner *sp = calldata->state->owner;
2065         struct super_block *sb = calldata->state->inode->i_sb;
2066
2067         if (calldata->roc)
2068                 pnfs_roc_release(calldata->state->inode);
2069         nfs4_put_open_state(calldata->state);
2070         nfs_free_seqid(calldata->arg.seqid);
2071         nfs4_put_state_owner(sp);
2072         nfs_sb_deactive_async(sb);
2073         kfree(calldata);
2074 }
2075
2076 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2077                 fmode_t fmode)
2078 {
2079         spin_lock(&state->owner->so_lock);
2080         if (!(fmode & FMODE_READ))
2081                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2082         if (!(fmode & FMODE_WRITE))
2083                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2084         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2085         spin_unlock(&state->owner->so_lock);
2086 }
2087
2088 static void nfs4_close_done(struct rpc_task *task, void *data)
2089 {
2090         struct nfs4_closedata *calldata = data;
2091         struct nfs4_state *state = calldata->state;
2092         struct nfs_server *server = NFS_SERVER(calldata->inode);
2093
2094         dprintk("%s: begin!\n", __func__);
2095         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2096                 return;
2097         /* hmm. we are done with the inode, and in the process of freeing
2098          * the state_owner. we keep this around to process errors
2099          */
2100         switch (task->tk_status) {
2101                 case 0:
2102                         if (calldata->roc)
2103                                 pnfs_roc_set_barrier(state->inode,
2104                                                      calldata->roc_barrier);
2105                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2106                         renew_lease(server, calldata->timestamp);
2107                         nfs4_close_clear_stateid_flags(state,
2108                                         calldata->arg.fmode);
2109                         break;
2110                 case -NFS4ERR_STALE_STATEID:
2111                 case -NFS4ERR_OLD_STATEID:
2112                 case -NFS4ERR_BAD_STATEID:
2113                 case -NFS4ERR_EXPIRED:
2114                         if (calldata->arg.fmode == 0)
2115                                 break;
2116                 default:
2117                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2118                                 rpc_restart_call_prepare(task);
2119         }
2120         nfs_release_seqid(calldata->arg.seqid);
2121         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2122         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2123 }
2124
2125 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2126 {
2127         struct nfs4_closedata *calldata = data;
2128         struct nfs4_state *state = calldata->state;
2129         struct inode *inode = calldata->inode;
2130         int call_close = 0;
2131
2132         dprintk("%s: begin!\n", __func__);
2133         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2134                 return;
2135
2136         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2137         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2138         spin_lock(&state->owner->so_lock);
2139         /* Calculate the change in open mode */
2140         if (state->n_rdwr == 0) {
2141                 if (state->n_rdonly == 0) {
2142                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2143                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2144                         calldata->arg.fmode &= ~FMODE_READ;
2145                 }
2146                 if (state->n_wronly == 0) {
2147                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2148                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2149                         calldata->arg.fmode &= ~FMODE_WRITE;
2150                 }
2151         }
2152         spin_unlock(&state->owner->so_lock);
2153
2154         if (!call_close) {
2155                 /* Note: exit _without_ calling nfs4_close_done */
2156                 task->tk_action = NULL;
2157                 nfs4_sequence_done(task, &calldata->res.seq_res);
2158                 goto out;
2159         }
2160
2161         if (calldata->arg.fmode == 0) {
2162                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2163                 if (calldata->roc &&
2164                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2165                         goto out;
2166         }
2167
2168         nfs_fattr_init(calldata->res.fattr);
2169         calldata->timestamp = jiffies;
2170         if (nfs4_setup_sequence(NFS_SERVER(inode),
2171                                 &calldata->arg.seq_args,
2172                                 &calldata->res.seq_res,
2173                                 task) != 0)
2174                 nfs_release_seqid(calldata->arg.seqid);
2175 out:
2176         dprintk("%s: done!\n", __func__);
2177 }
2178
2179 static const struct rpc_call_ops nfs4_close_ops = {
2180         .rpc_call_prepare = nfs4_close_prepare,
2181         .rpc_call_done = nfs4_close_done,
2182         .rpc_release = nfs4_free_closedata,
2183 };
2184
2185 /*
2186  * It is possible for data to be read/written from a mem-mapped file
2187  * after the sys_close call (which hits the vfs layer as a flush).
2188  * This means that we can't safely call nfsv4 close on a file until
2189  * the inode is cleared. This in turn means that we are not good
2190  * NFSv4 citizens - we do not indicate to the server to update the file's
2191  * share state even when we are done with one of the three share
2192  * stateid's in the inode.
2193  *
2194  * NOTE: Caller must be holding the sp->so_owner semaphore!
2195  */
2196 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2197 {
2198         struct nfs_server *server = NFS_SERVER(state->inode);
2199         struct nfs4_closedata *calldata;
2200         struct nfs4_state_owner *sp = state->owner;
2201         struct rpc_task *task;
2202         struct rpc_message msg = {
2203                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2204                 .rpc_cred = state->owner->so_cred,
2205         };
2206         struct rpc_task_setup task_setup_data = {
2207                 .rpc_client = server->client,
2208                 .rpc_message = &msg,
2209                 .callback_ops = &nfs4_close_ops,
2210                 .workqueue = nfsiod_workqueue,
2211                 .flags = RPC_TASK_ASYNC,
2212         };
2213         int status = -ENOMEM;
2214
2215         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2216         if (calldata == NULL)
2217                 goto out;
2218         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2219         calldata->inode = state->inode;
2220         calldata->state = state;
2221         calldata->arg.fh = NFS_FH(state->inode);
2222         calldata->arg.stateid = &state->open_stateid;
2223         /* Serialization for the sequence id */
2224         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2225         if (calldata->arg.seqid == NULL)
2226                 goto out_free_calldata;
2227         calldata->arg.fmode = 0;
2228         calldata->arg.bitmask = server->cache_consistency_bitmask;
2229         calldata->res.fattr = &calldata->fattr;
2230         calldata->res.seqid = calldata->arg.seqid;
2231         calldata->res.server = server;
2232         calldata->roc = pnfs_roc(state->inode);
2233         nfs_sb_active(calldata->inode->i_sb);
2234
2235         msg.rpc_argp = &calldata->arg;
2236         msg.rpc_resp = &calldata->res;
2237         task_setup_data.callback_data = calldata;
2238         task = rpc_run_task(&task_setup_data);
2239         if (IS_ERR(task))
2240                 return PTR_ERR(task);
2241         status = 0;
2242         if (wait)
2243                 status = rpc_wait_for_completion_task(task);
2244         rpc_put_task(task);
2245         return status;
2246 out_free_calldata:
2247         kfree(calldata);
2248 out:
2249         nfs4_put_open_state(state);
2250         nfs4_put_state_owner(sp);
2251         return status;
2252 }
2253
2254 static struct inode *
2255 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2256 {
2257         struct nfs4_state *state;
2258
2259         /* Protect against concurrent sillydeletes */
2260         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2261                              ctx->cred, &ctx->mdsthreshold);
2262         if (IS_ERR(state))
2263                 return ERR_CAST(state);
2264         ctx->state = state;
2265         return igrab(state->inode);
2266 }
2267
2268 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2269 {
2270         if (ctx->state == NULL)
2271                 return;
2272         if (is_sync)
2273                 nfs4_close_sync(ctx->state, ctx->mode);
2274         else
2275                 nfs4_close_state(ctx->state, ctx->mode);
2276 }
2277
2278 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2279 {
2280         struct nfs4_server_caps_arg args = {
2281                 .fhandle = fhandle,
2282         };
2283         struct nfs4_server_caps_res res = {};
2284         struct rpc_message msg = {
2285                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2286                 .rpc_argp = &args,
2287                 .rpc_resp = &res,
2288         };
2289         int status;
2290
2291         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2292         if (status == 0) {
2293                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2294                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2295                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2296                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2297                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2298                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2299                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2300                         server->caps |= NFS_CAP_ACLS;
2301                 if (res.has_links != 0)
2302                         server->caps |= NFS_CAP_HARDLINKS;
2303                 if (res.has_symlinks != 0)
2304                         server->caps |= NFS_CAP_SYMLINKS;
2305                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2306                         server->caps |= NFS_CAP_FILEID;
2307                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2308                         server->caps |= NFS_CAP_MODE;
2309                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2310                         server->caps |= NFS_CAP_NLINK;
2311                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2312                         server->caps |= NFS_CAP_OWNER;
2313                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2314                         server->caps |= NFS_CAP_OWNER_GROUP;
2315                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2316                         server->caps |= NFS_CAP_ATIME;
2317                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2318                         server->caps |= NFS_CAP_CTIME;
2319                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2320                         server->caps |= NFS_CAP_MTIME;
2321
2322                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2323                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2324                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2325                 server->acl_bitmask = res.acl_bitmask;
2326                 server->fh_expire_type = res.fh_expire_type;
2327         }
2328
2329         return status;
2330 }
2331
2332 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2333 {
2334         struct nfs4_exception exception = { };
2335         int err;
2336         do {
2337                 err = nfs4_handle_exception(server,
2338                                 _nfs4_server_capabilities(server, fhandle),
2339                                 &exception);
2340         } while (exception.retry);
2341         return err;
2342 }
2343
2344 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2345                 struct nfs_fsinfo *info)
2346 {
2347         struct nfs4_lookup_root_arg args = {
2348                 .bitmask = nfs4_fattr_bitmap,
2349         };
2350         struct nfs4_lookup_res res = {
2351                 .server = server,
2352                 .fattr = info->fattr,
2353                 .fh = fhandle,
2354         };
2355         struct rpc_message msg = {
2356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2357                 .rpc_argp = &args,
2358                 .rpc_resp = &res,
2359         };
2360
2361         nfs_fattr_init(info->fattr);
2362         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2363 }
2364
2365 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2366                 struct nfs_fsinfo *info)
2367 {
2368         struct nfs4_exception exception = { };
2369         int err;
2370         do {
2371                 err = _nfs4_lookup_root(server, fhandle, info);
2372                 switch (err) {
2373                 case 0:
2374                 case -NFS4ERR_WRONGSEC:
2375                         goto out;
2376                 default:
2377                         err = nfs4_handle_exception(server, err, &exception);
2378                 }
2379         } while (exception.retry);
2380 out:
2381         return err;
2382 }
2383
2384 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2385                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2386 {
2387         struct rpc_auth *auth;
2388         int ret;
2389
2390         auth = rpcauth_create(flavor, server->client);
2391         if (IS_ERR(auth)) {
2392                 ret = -EIO;
2393                 goto out;
2394         }
2395         ret = nfs4_lookup_root(server, fhandle, info);
2396 out:
2397         return ret;
2398 }
2399
2400 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2401                               struct nfs_fsinfo *info)
2402 {
2403         int i, len, status = 0;
2404         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2405
2406         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2407         if (len < 0)
2408                 return len;
2409
2410         for (i = 0; i < len; i++) {
2411                 /* AUTH_UNIX is the default flavor if none was specified,
2412                  * thus has already been tried. */
2413                 if (flav_array[i] == RPC_AUTH_UNIX)
2414                         continue;
2415
2416                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2417                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2418                         continue;
2419                 break;
2420         }
2421         /*
2422          * -EACCESS could mean that the user doesn't have correct permissions
2423          * to access the mount.  It could also mean that we tried to mount
2424          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2425          * existing mount programs don't handle -EACCES very well so it should
2426          * be mapped to -EPERM instead.
2427          */
2428         if (status == -EACCES)
2429                 status = -EPERM;
2430         return status;
2431 }
2432
2433 /*
2434  * get the file handle for the "/" directory on the server
2435  */
2436 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2437                          struct nfs_fsinfo *info)
2438 {
2439         int minor_version = server->nfs_client->cl_minorversion;
2440         int status = nfs4_lookup_root(server, fhandle, info);
2441         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2442                 /*
2443                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2444                  * by nfs4_map_errors() as this function exits.
2445                  */
2446                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2447         if (status == 0)
2448                 status = nfs4_server_capabilities(server, fhandle);
2449         if (status == 0)
2450                 status = nfs4_do_fsinfo(server, fhandle, info);
2451         return nfs4_map_errors(status);
2452 }
2453
2454 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2455                               struct nfs_fsinfo *info)
2456 {
2457         int error;
2458         struct nfs_fattr *fattr = info->fattr;
2459
2460         error = nfs4_server_capabilities(server, mntfh);
2461         if (error < 0) {
2462                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2463                 return error;
2464         }
2465
2466         error = nfs4_proc_getattr(server, mntfh, fattr);
2467         if (error < 0) {
2468                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2469                 return error;
2470         }
2471
2472         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2473             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2474                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2475
2476         return error;
2477 }
2478
2479 /*
2480  * Get locations and (maybe) other attributes of a referral.
2481  * Note that we'll actually follow the referral later when
2482  * we detect fsid mismatch in inode revalidation
2483  */
2484 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2485                              const struct qstr *name, struct nfs_fattr *fattr,
2486                              struct nfs_fh *fhandle)
2487 {
2488         int status = -ENOMEM;
2489         struct page *page = NULL;
2490         struct nfs4_fs_locations *locations = NULL;
2491
2492         page = alloc_page(GFP_KERNEL);
2493         if (page == NULL)
2494                 goto out;
2495         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2496         if (locations == NULL)
2497                 goto out;
2498
2499         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2500         if (status != 0)
2501                 goto out;
2502         /* Make sure server returned a different fsid for the referral */
2503         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2504                 dprintk("%s: server did not return a different fsid for"
2505                         " a referral at %s\n", __func__, name->name);
2506                 status = -EIO;
2507                 goto out;
2508         }
2509         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2510         nfs_fixup_referral_attributes(&locations->fattr);
2511
2512         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2513         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2514         memset(fhandle, 0, sizeof(struct nfs_fh));
2515 out:
2516         if (page)
2517                 __free_page(page);
2518         kfree(locations);
2519         return status;
2520 }
2521
2522 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2523 {
2524         struct nfs4_getattr_arg args = {
2525                 .fh = fhandle,
2526                 .bitmask = server->attr_bitmask,
2527         };
2528         struct nfs4_getattr_res res = {
2529                 .fattr = fattr,
2530                 .server = server,
2531         };
2532         struct rpc_message msg = {
2533                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2534                 .rpc_argp = &args,
2535                 .rpc_resp = &res,
2536         };
2537
2538         nfs_fattr_init(fattr);
2539         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2540 }
2541
2542 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2543 {
2544         struct nfs4_exception exception = { };
2545         int err;
2546         do {
2547                 err = nfs4_handle_exception(server,
2548                                 _nfs4_proc_getattr(server, fhandle, fattr),
2549                                 &exception);
2550         } while (exception.retry);
2551         return err;
2552 }
2553
2554 /*
2555  * The file is not closed if it is opened due to the a request to change
2556  * the size of the file. The open call will not be needed once the
2557  * VFS layer lookup-intents are implemented.
2558  *
2559  * Close is called when the inode is destroyed.
2560  * If we haven't opened the file for O_WRONLY, we
2561  * need to in the size_change case to obtain a stateid.
2562  *
2563  * Got race?
2564  * Because OPEN is always done by name in nfsv4, it is
2565  * possible that we opened a different file by the same
2566  * name.  We can recognize this race condition, but we
2567  * can't do anything about it besides returning an error.
2568  *
2569  * This will be fixed with VFS changes (lookup-intent).
2570  */
2571 static int
2572 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2573                   struct iattr *sattr)
2574 {
2575         struct inode *inode = dentry->d_inode;
2576         struct rpc_cred *cred = NULL;
2577         struct nfs4_state *state = NULL;
2578         int status;
2579
2580         if (pnfs_ld_layoutret_on_setattr(inode))
2581                 pnfs_return_layout(inode);
2582
2583         nfs_fattr_init(fattr);
2584
2585         /* Deal with open(O_TRUNC) */
2586         if (sattr->ia_valid & ATTR_OPEN)
2587                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2588
2589         /* Optimization: if the end result is no change, don't RPC */
2590         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2591                 return 0;
2592
2593         /* Search for an existing open(O_WRITE) file */
2594         if (sattr->ia_valid & ATTR_FILE) {
2595                 struct nfs_open_context *ctx;
2596
2597                 ctx = nfs_file_open_context(sattr->ia_file);
2598                 if (ctx) {
2599                         cred = ctx->cred;
2600                         state = ctx->state;
2601                 }
2602         }
2603
2604         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2605         if (status == 0)
2606                 nfs_setattr_update_inode(inode, sattr);
2607         return status;
2608 }
2609
2610 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2611                 const struct qstr *name, struct nfs_fh *fhandle,
2612                 struct nfs_fattr *fattr)
2613 {
2614         struct nfs_server *server = NFS_SERVER(dir);
2615         int                    status;
2616         struct nfs4_lookup_arg args = {
2617                 .bitmask = server->attr_bitmask,
2618                 .dir_fh = NFS_FH(dir),
2619                 .name = name,
2620         };
2621         struct nfs4_lookup_res res = {
2622                 .server = server,
2623                 .fattr = fattr,
2624                 .fh = fhandle,
2625         };
2626         struct rpc_message msg = {
2627                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2628                 .rpc_argp = &args,
2629                 .rpc_resp = &res,
2630         };
2631
2632         nfs_fattr_init(fattr);
2633
2634         dprintk("NFS call  lookup %s\n", name->name);
2635         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2636         dprintk("NFS reply lookup: %d\n", status);
2637         return status;
2638 }
2639
2640 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2641 {
2642         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2643                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2644         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2645         fattr->nlink = 2;
2646 }
2647
2648 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2649                                    struct qstr *name, struct nfs_fh *fhandle,
2650                                    struct nfs_fattr *fattr)
2651 {
2652         struct nfs4_exception exception = { };
2653         struct rpc_clnt *client = *clnt;
2654         int err;
2655         do {
2656                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2657                 switch (err) {
2658                 case -NFS4ERR_BADNAME:
2659                         err = -ENOENT;
2660                         goto out;
2661                 case -NFS4ERR_MOVED:
2662                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2663                         goto out;
2664                 case -NFS4ERR_WRONGSEC:
2665                         err = -EPERM;
2666                         if (client != *clnt)
2667                                 goto out;
2668
2669                         client = nfs4_create_sec_client(client, dir, name);
2670                         if (IS_ERR(client))
2671                                 return PTR_ERR(client);
2672
2673                         exception.retry = 1;
2674                         break;
2675                 default:
2676                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2677                 }
2678         } while (exception.retry);
2679
2680 out:
2681         if (err == 0)
2682                 *clnt = client;
2683         else if (client != *clnt)
2684                 rpc_shutdown_client(client);
2685
2686         return err;
2687 }
2688
2689 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2690                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2691 {
2692         int status;
2693         struct rpc_clnt *client = NFS_CLIENT(dir);
2694
2695         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2696         if (client != NFS_CLIENT(dir)) {
2697                 rpc_shutdown_client(client);
2698                 nfs_fixup_secinfo_attributes(fattr);
2699         }
2700         return status;
2701 }
2702
2703 struct rpc_clnt *
2704 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2705                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2706 {
2707         int status;
2708         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2709
2710         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2711         if (status < 0) {
2712                 rpc_shutdown_client(client);
2713                 return ERR_PTR(status);
2714         }
2715         return client;
2716 }
2717
2718 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2719 {
2720         struct nfs_server *server = NFS_SERVER(inode);
2721         struct nfs4_accessargs args = {
2722                 .fh = NFS_FH(inode),
2723                 .bitmask = server->cache_consistency_bitmask,
2724         };
2725         struct nfs4_accessres res = {
2726                 .server = server,
2727         };
2728         struct rpc_message msg = {
2729                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2730                 .rpc_argp = &args,
2731                 .rpc_resp = &res,
2732                 .rpc_cred = entry->cred,
2733         };
2734         int mode = entry->mask;
2735         int status;
2736
2737         /*
2738          * Determine which access bits we want to ask for...
2739          */
2740         if (mode & MAY_READ)
2741                 args.access |= NFS4_ACCESS_READ;
2742         if (S_ISDIR(inode->i_mode)) {
2743                 if (mode & MAY_WRITE)
2744                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2745                 if (mode & MAY_EXEC)
2746                         args.access |= NFS4_ACCESS_LOOKUP;
2747         } else {
2748                 if (mode & MAY_WRITE)
2749                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2750                 if (mode & MAY_EXEC)
2751                         args.access |= NFS4_ACCESS_EXECUTE;
2752         }
2753
2754         res.fattr = nfs_alloc_fattr();
2755         if (res.fattr == NULL)
2756                 return -ENOMEM;
2757
2758         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2759         if (!status) {
2760                 nfs_access_set_mask(entry, res.access);
2761                 nfs_refresh_inode(inode, res.fattr);
2762         }
2763         nfs_free_fattr(res.fattr);
2764         return status;
2765 }
2766
2767 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2768 {
2769         struct nfs4_exception exception = { };
2770         int err;
2771         do {
2772                 err = nfs4_handle_exception(NFS_SERVER(inode),
2773                                 _nfs4_proc_access(inode, entry),
2774                                 &exception);
2775         } while (exception.retry);
2776         return err;
2777 }
2778
2779 /*
2780  * TODO: For the time being, we don't try to get any attributes
2781  * along with any of the zero-copy operations READ, READDIR,
2782  * READLINK, WRITE.
2783  *
2784  * In the case of the first three, we want to put the GETATTR
2785  * after the read-type operation -- this is because it is hard
2786  * to predict the length of a GETATTR response in v4, and thus
2787  * align the READ data correctly.  This means that the GETATTR
2788  * may end up partially falling into the page cache, and we should
2789  * shift it into the 'tail' of the xdr_buf before processing.
2790  * To do this efficiently, we need to know the total length
2791  * of data received, which doesn't seem to be available outside
2792  * of the RPC layer.
2793  *
2794  * In the case of WRITE, we also want to put the GETATTR after
2795  * the operation -- in this case because we want to make sure
2796  * we get the post-operation mtime and size.
2797  *
2798  * Both of these changes to the XDR layer would in fact be quite
2799  * minor, but I decided to leave them for a subsequent patch.
2800  */
2801 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2802                 unsigned int pgbase, unsigned int pglen)
2803 {
2804         struct nfs4_readlink args = {
2805                 .fh       = NFS_FH(inode),
2806                 .pgbase   = pgbase,
2807                 .pglen    = pglen,
2808                 .pages    = &page,
2809         };
2810         struct nfs4_readlink_res res;
2811         struct rpc_message msg = {
2812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2813                 .rpc_argp = &args,
2814                 .rpc_resp = &res,
2815         };
2816
2817         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2818 }
2819
2820 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2821                 unsigned int pgbase, unsigned int pglen)
2822 {
2823         struct nfs4_exception exception = { };
2824         int err;
2825         do {
2826                 err = nfs4_handle_exception(NFS_SERVER(inode),
2827                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2828                                 &exception);
2829         } while (exception.retry);
2830         return err;
2831 }
2832
2833 /*
2834  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2835  */
2836 static int
2837 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2838                  int flags)
2839 {
2840         struct nfs_open_context *ctx;
2841         struct nfs4_state *state;
2842         int status = 0;
2843
2844         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2845         if (IS_ERR(ctx))
2846                 return PTR_ERR(ctx);
2847
2848         sattr->ia_mode &= ~current_umask();
2849         state = nfs4_do_open(dir, dentry, ctx->mode,
2850                         flags, sattr, ctx->cred,
2851                         &ctx->mdsthreshold);
2852         d_drop(dentry);
2853         if (IS_ERR(state)) {
2854                 status = PTR_ERR(state);
2855                 goto out;
2856         }
2857         d_add(dentry, igrab(state->inode));
2858         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2859         ctx->state = state;
2860 out:
2861         put_nfs_open_context(ctx);
2862         return status;
2863 }
2864
2865 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2866 {
2867         struct nfs_server *server = NFS_SERVER(dir);
2868         struct nfs_removeargs args = {
2869                 .fh = NFS_FH(dir),
2870                 .name = *name,
2871         };
2872         struct nfs_removeres res = {
2873                 .server = server,
2874         };
2875         struct rpc_message msg = {
2876                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2877                 .rpc_argp = &args,
2878                 .rpc_resp = &res,
2879         };
2880         int status;
2881
2882         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2883         if (status == 0)
2884                 update_changeattr(dir, &res.cinfo);
2885         return status;
2886 }
2887
2888 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2889 {
2890         struct nfs4_exception exception = { };
2891         int err;
2892         do {
2893                 err = nfs4_handle_exception(NFS_SERVER(dir),
2894                                 _nfs4_proc_remove(dir, name),
2895                                 &exception);
2896         } while (exception.retry);
2897         return err;
2898 }
2899
2900 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2901 {
2902         struct nfs_server *server = NFS_SERVER(dir);
2903         struct nfs_removeargs *args = msg->rpc_argp;
2904         struct nfs_removeres *res = msg->rpc_resp;
2905
2906         res->server = server;
2907         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2908         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2909 }
2910
2911 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2912 {
2913         nfs4_setup_sequence(NFS_SERVER(data->dir),
2914                         &data->args.seq_args,
2915                         &data->res.seq_res,
2916                         task);
2917 }
2918
2919 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2920 {
2921         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2922
2923         if (!nfs4_sequence_done(task, &res->seq_res))
2924                 return 0;
2925         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2926                 return 0;
2927         update_changeattr(dir, &res->cinfo);
2928         return 1;
2929 }
2930
2931 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2932 {
2933         struct nfs_server *server = NFS_SERVER(dir);
2934         struct nfs_renameargs *arg = msg->rpc_argp;
2935         struct nfs_renameres *res = msg->rpc_resp;
2936
2937         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2938         res->server = server;
2939         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2940 }
2941
2942 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2943 {
2944         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2945                         &data->args.seq_args,
2946                         &data->res.seq_res,
2947                         task);
2948 }
2949
2950 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2951                                  struct inode *new_dir)
2952 {
2953         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2954
2955         if (!nfs4_sequence_done(task, &res->seq_res))
2956                 return 0;
2957         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2958                 return 0;
2959
2960         update_changeattr(old_dir, &res->old_cinfo);
2961         update_changeattr(new_dir, &res->new_cinfo);
2962         return 1;
2963 }
2964
2965 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2966                 struct inode *new_dir, struct qstr *new_name)
2967 {
2968         struct nfs_server *server = NFS_SERVER(old_dir);
2969         struct nfs_renameargs arg = {
2970                 .old_dir = NFS_FH(old_dir),
2971                 .new_dir = NFS_FH(new_dir),
2972                 .old_name = old_name,
2973                 .new_name = new_name,
2974         };
2975         struct nfs_renameres res = {
2976                 .server = server,
2977         };
2978         struct rpc_message msg = {
2979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2980                 .rpc_argp = &arg,
2981                 .rpc_resp = &res,
2982         };
2983         int status = -ENOMEM;
2984
2985         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2986         if (!status) {
2987                 update_changeattr(old_dir, &res.old_cinfo);
2988                 update_changeattr(new_dir, &res.new_cinfo);
2989         }
2990         return status;
2991 }
2992
2993 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2994                 struct inode *new_dir, struct qstr *new_name)
2995 {
2996         struct nfs4_exception exception = { };
2997         int err;
2998         do {
2999                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3000                                 _nfs4_proc_rename(old_dir, old_name,
3001                                         new_dir, new_name),
3002                                 &exception);
3003         } while (exception.retry);
3004         return err;
3005 }
3006
3007 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3008 {
3009         struct nfs_server *server = NFS_SERVER(inode);
3010         struct nfs4_link_arg arg = {
3011                 .fh     = NFS_FH(inode),
3012                 .dir_fh = NFS_FH(dir),
3013                 .name   = name,
3014                 .bitmask = server->attr_bitmask,
3015         };
3016         struct nfs4_link_res res = {
3017                 .server = server,
3018         };
3019         struct rpc_message msg = {
3020                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3021                 .rpc_argp = &arg,
3022                 .rpc_resp = &res,
3023         };
3024         int status = -ENOMEM;
3025
3026         res.fattr = nfs_alloc_fattr();
3027         if (res.fattr == NULL)
3028                 goto out;
3029
3030         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3031         if (!status) {
3032                 update_changeattr(dir, &res.cinfo);
3033                 nfs_post_op_update_inode(inode, res.fattr);
3034         }
3035 out:
3036         nfs_free_fattr(res.fattr);
3037         return status;
3038 }
3039
3040 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3041 {
3042         struct nfs4_exception exception = { };
3043         int err;
3044         do {
3045                 err = nfs4_handle_exception(NFS_SERVER(inode),
3046                                 _nfs4_proc_link(inode, dir, name),
3047                                 &exception);
3048         } while (exception.retry);
3049         return err;
3050 }
3051
3052 struct nfs4_createdata {
3053         struct rpc_message msg;
3054         struct nfs4_create_arg arg;
3055         struct nfs4_create_res res;
3056         struct nfs_fh fh;
3057         struct nfs_fattr fattr;
3058 };
3059
3060 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3061                 struct qstr *name, struct iattr *sattr, u32 ftype)
3062 {
3063         struct nfs4_createdata *data;
3064
3065         data = kzalloc(sizeof(*data), GFP_KERNEL);
3066         if (data != NULL) {
3067                 struct nfs_server *server = NFS_SERVER(dir);
3068
3069                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3070                 data->msg.rpc_argp = &data->arg;
3071                 data->msg.rpc_resp = &data->res;
3072                 data->arg.dir_fh = NFS_FH(dir);
3073                 data->arg.server = server;
3074                 data->arg.name = name;
3075                 data->arg.attrs = sattr;
3076                 data->arg.ftype = ftype;
3077                 data->arg.bitmask = server->attr_bitmask;
3078                 data->res.server = server;
3079                 data->res.fh = &data->fh;
3080                 data->res.fattr = &data->fattr;
3081                 nfs_fattr_init(data->res.fattr);
3082         }
3083         return data;
3084 }
3085
3086 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3087 {
3088         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3089                                     &data->arg.seq_args, &data->res.seq_res, 1);
3090         if (status == 0) {
3091                 update_changeattr(dir, &data->res.dir_cinfo);
3092                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3093         }
3094         return status;
3095 }
3096
3097 static void nfs4_free_createdata(struct nfs4_createdata *data)
3098 {
3099         kfree(data);
3100 }
3101
3102 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3103                 struct page *page, unsigned int len, struct iattr *sattr)
3104 {
3105         struct nfs4_createdata *data;
3106         int status = -ENAMETOOLONG;
3107
3108         if (len > NFS4_MAXPATHLEN)
3109                 goto out;
3110
3111         status = -ENOMEM;
3112         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3113         if (data == NULL)
3114                 goto out;
3115
3116         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3117         data->arg.u.symlink.pages = &page;
3118         data->arg.u.symlink.len = len;
3119
3120         status = nfs4_do_create(dir, dentry, data);
3121
3122         nfs4_free_createdata(data);
3123 out:
3124         return status;
3125 }
3126
3127 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3128                 struct page *page, unsigned int len, struct iattr *sattr)
3129 {
3130         struct nfs4_exception exception = { };
3131         int err;
3132         do {
3133                 err = nfs4_handle_exception(NFS_SERVER(dir),
3134                                 _nfs4_proc_symlink(dir, dentry, page,
3135                                                         len, sattr),
3136                                 &exception);
3137         } while (exception.retry);
3138         return err;
3139 }
3140
3141 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3142                 struct iattr *sattr)
3143 {
3144         struct nfs4_createdata *data;
3145         int status = -ENOMEM;
3146
3147         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3148         if (data == NULL)
3149                 goto out;
3150
3151         status = nfs4_do_create(dir, dentry, data);
3152
3153         nfs4_free_createdata(data);
3154 out:
3155         return status;
3156 }
3157
3158 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3159                 struct iattr *sattr)
3160 {
3161         struct nfs4_exception exception = { };
3162         int err;
3163
3164         sattr->ia_mode &= ~current_umask();
3165         do {
3166                 err = nfs4_handle_exception(NFS_SERVER(dir),
3167                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3168                                 &exception);
3169         } while (exception.retry);
3170         return err;
3171 }
3172
3173 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3174                 u64 cookie, struct page **pages, unsigned int count, int plus)
3175 {
3176         struct inode            *dir = dentry->d_inode;
3177         struct nfs4_readdir_arg args = {
3178                 .fh = NFS_FH(dir),
3179                 .pages = pages,
3180                 .pgbase = 0,
3181                 .count = count,
3182                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3183                 .plus = plus,
3184         };
3185         struct nfs4_readdir_res res;
3186         struct rpc_message msg = {
3187                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3188                 .rpc_argp = &args,
3189                 .rpc_resp = &res,
3190                 .rpc_cred = cred,
3191         };
3192         int                     status;
3193
3194         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3195                         dentry->d_parent->d_name.name,
3196                         dentry->d_name.name,
3197                         (unsigned long long)cookie);
3198         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3199         res.pgbase = args.pgbase;
3200         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3201         if (status >= 0) {
3202                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3203                 status += args.pgbase;
3204         }
3205
3206         nfs_invalidate_atime(dir);
3207
3208         dprintk("%s: returns %d\n", __func__, status);
3209         return status;
3210 }
3211
3212 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3213                 u64 cookie, struct page **pages, unsigned int count, int plus)
3214 {
3215         struct nfs4_exception exception = { };
3216         int err;
3217         do {
3218                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3219                                 _nfs4_proc_readdir(dentry, cred, cookie,
3220                                         pages, count, plus),
3221                                 &exception);
3222         } while (exception.retry);
3223         return err;
3224 }
3225
3226 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3227                 struct iattr *sattr, dev_t rdev)
3228 {
3229         struct nfs4_createdata *data;
3230         int mode = sattr->ia_mode;
3231         int status = -ENOMEM;
3232
3233         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3234         if (data == NULL)
3235                 goto out;
3236
3237         if (S_ISFIFO(mode))
3238                 data->arg.ftype = NF4FIFO;
3239         else if (S_ISBLK(mode)) {
3240                 data->arg.ftype = NF4BLK;
3241                 data->arg.u.device.specdata1 = MAJOR(rdev);
3242                 data->arg.u.device.specdata2 = MINOR(rdev);
3243         }
3244         else if (S_ISCHR(mode)) {
3245                 data->arg.ftype = NF4CHR;
3246                 data->arg.u.device.specdata1 = MAJOR(rdev);
3247                 data->arg.u.device.specdata2 = MINOR(rdev);
3248         } else if (!S_ISSOCK(mode)) {
3249                 status = -EINVAL;
3250                 goto out_free;
3251         }
3252
3253         status = nfs4_do_create(dir, dentry, data);
3254 out_free:
3255         nfs4_free_createdata(data);
3256 out:
3257         return status;
3258 }
3259
3260 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3261                 struct iattr *sattr, dev_t rdev)
3262 {
3263         struct nfs4_exception exception = { };
3264         int err;
3265
3266         sattr->ia_mode &= ~current_umask();
3267         do {
3268                 err = nfs4_handle_exception(NFS_SERVER(dir),
3269                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3270                                 &exception);
3271         } while (exception.retry);
3272         return err;
3273 }
3274
3275 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3276                  struct nfs_fsstat *fsstat)
3277 {
3278         struct nfs4_statfs_arg args = {
3279                 .fh = fhandle,
3280                 .bitmask = server->attr_bitmask,
3281         };
3282         struct nfs4_statfs_res res = {
3283                 .fsstat = fsstat,
3284         };
3285         struct rpc_message msg = {
3286                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3287                 .rpc_argp = &args,
3288                 .rpc_resp = &res,
3289         };
3290
3291         nfs_fattr_init(fsstat->fattr);
3292         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3293 }
3294
3295 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3296 {
3297         struct nfs4_exception exception = { };
3298         int err;
3299         do {
3300                 err = nfs4_handle_exception(server,
3301                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3302                                 &exception);
3303         } while (exception.retry);
3304         return err;
3305 }
3306
3307 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3308                 struct nfs_fsinfo *fsinfo)
3309 {
3310         struct nfs4_fsinfo_arg args = {
3311                 .fh = fhandle,
3312                 .bitmask = server->attr_bitmask,
3313         };
3314         struct nfs4_fsinfo_res res = {
3315                 .fsinfo = fsinfo,
3316         };
3317         struct rpc_message msg = {
3318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3319                 .rpc_argp = &args,
3320                 .rpc_resp = &res,
3321         };
3322
3323         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3324 }
3325
3326 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3327 {
3328         struct nfs4_exception exception = { };
3329         int err;
3330
3331         do {
3332                 err = nfs4_handle_exception(server,
3333                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3334                                 &exception);
3335         } while (exception.retry);
3336         return err;
3337 }
3338
3339 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3340 {
3341         int error;
3342
3343         nfs_fattr_init(fsinfo->fattr);
3344         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3345         if (error == 0) {
3346                 /* block layout checks this! */
3347                 server->pnfs_blksize = fsinfo->blksize;
3348                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3349         }
3350
3351         return error;
3352 }
3353
3354 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3355                 struct nfs_pathconf *pathconf)
3356 {
3357         struct nfs4_pathconf_arg args = {
3358                 .fh = fhandle,
3359                 .bitmask = server->attr_bitmask,
3360         };
3361         struct nfs4_pathconf_res res = {
3362                 .pathconf = pathconf,
3363         };
3364         struct rpc_message msg = {
3365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3366                 .rpc_argp = &args,
3367                 .rpc_resp = &res,
3368         };
3369
3370         /* None of the pathconf attributes are mandatory to implement */
3371         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3372                 memset(pathconf, 0, sizeof(*pathconf));
3373                 return 0;
3374         }
3375
3376         nfs_fattr_init(pathconf->fattr);
3377         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3378 }
3379
3380 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3381                 struct nfs_pathconf *pathconf)
3382 {
3383         struct nfs4_exception exception = { };
3384         int err;
3385
3386         do {
3387                 err = nfs4_handle_exception(server,
3388                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3389                                 &exception);
3390         } while (exception.retry);
3391         return err;
3392 }
3393
3394 void __nfs4_read_done_cb(struct nfs_read_data *data)
3395 {
3396         nfs_invalidate_atime(data->header->inode);
3397 }
3398
3399 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3400 {
3401         struct nfs_server *server = NFS_SERVER(data->header->inode);
3402
3403         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3404                 rpc_restart_call_prepare(task);
3405                 return -EAGAIN;
3406         }
3407
3408         __nfs4_read_done_cb(data);
3409         if (task->tk_status > 0)
3410                 renew_lease(server, data->timestamp);
3411         return 0;
3412 }
3413
3414 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3415 {
3416
3417         dprintk("--> %s\n", __func__);
3418
3419         if (!nfs4_sequence_done(task, &data->res.seq_res))
3420                 return -EAGAIN;
3421
3422         return data->read_done_cb ? data->read_done_cb(task, data) :
3423                                     nfs4_read_done_cb(task, data);
3424 }
3425
3426 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3427 {
3428         data->timestamp   = jiffies;
3429         data->read_done_cb = nfs4_read_done_cb;
3430         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3431         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3432 }
3433
3434 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3435 {
3436         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3437                         &data->args.seq_args,
3438                         &data->res.seq_res,
3439                         task);
3440 }
3441
3442 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3443 {
3444         struct inode *inode = data->header->inode;
3445
3446         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3447                 rpc_restart_call_prepare(task);
3448                 return -EAGAIN;
3449         }
3450         if (task->tk_status >= 0) {
3451                 renew_lease(NFS_SERVER(inode), data->timestamp);
3452                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3453         }
3454         return 0;
3455 }
3456
3457 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3458 {
3459         if (!nfs4_sequence_done(task, &data->res.seq_res))
3460                 return -EAGAIN;
3461         return data->write_done_cb ? data->write_done_cb(task, data) :
3462                 nfs4_write_done_cb(task, data);
3463 }
3464
3465 static
3466 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3467 {
3468         const struct nfs_pgio_header *hdr = data->header;
3469
3470         /* Don't request attributes for pNFS or O_DIRECT writes */
3471         if (data->ds_clp != NULL || hdr->dreq != NULL)
3472                 return false;
3473         /* Otherwise, request attributes if and only if we don't hold
3474          * a delegation
3475          */
3476         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3477 }
3478
3479 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3480 {
3481         struct nfs_server *server = NFS_SERVER(data->header->inode);
3482
3483         if (!nfs4_write_need_cache_consistency_data(data)) {
3484                 data->args.bitmask = NULL;
3485                 data->res.fattr = NULL;
3486         } else
3487                 data->args.bitmask = server->cache_consistency_bitmask;
3488
3489         if (!data->write_done_cb)
3490                 data->write_done_cb = nfs4_write_done_cb;
3491         data->res.server = server;
3492         data->timestamp   = jiffies;
3493
3494         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3495         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3496 }
3497
3498 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3499 {
3500         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3501                         &data->args.seq_args,
3502                         &data->res.seq_res,
3503                         task);
3504 }
3505
3506 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3507 {
3508         nfs4_setup_sequence(NFS_SERVER(data->inode),
3509                         &data->args.seq_args,
3510                         &data->res.seq_res,
3511                         task);
3512 }
3513
3514 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3515 {
3516         struct inode *inode = data->inode;
3517
3518         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3519                 rpc_restart_call_prepare(task);
3520                 return -EAGAIN;
3521         }
3522         return 0;
3523 }
3524
3525 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3526 {
3527         if (!nfs4_sequence_done(task, &data->res.seq_res))
3528                 return -EAGAIN;
3529         return data->commit_done_cb(task, data);
3530 }
3531
3532 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3533 {
3534         struct nfs_server *server = NFS_SERVER(data->inode);
3535
3536         if (data->commit_done_cb == NULL)
3537                 data->commit_done_cb = nfs4_commit_done_cb;
3538         data->res.server = server;
3539         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3540         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3541 }
3542
3543 struct nfs4_renewdata {
3544         struct nfs_client       *client;
3545         unsigned long           timestamp;
3546 };
3547
3548 /*
3549  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3550  * standalone procedure for queueing an asynchronous RENEW.
3551  */
3552 static void nfs4_renew_release(void *calldata)
3553 {
3554         struct nfs4_renewdata *data = calldata;
3555         struct nfs_client *clp = data->client;
3556
3557         if (atomic_read(&clp->cl_count) > 1)
3558                 nfs4_schedule_state_renewal(clp);
3559         nfs_put_client(clp);
3560         kfree(data);
3561 }
3562
3563 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3564 {
3565         struct nfs4_renewdata *data = calldata;
3566         struct nfs_client *clp = data->client;
3567         unsigned long timestamp = data->timestamp;
3568
3569         if (task->tk_status < 0) {
3570                 /* Unless we're shutting down, schedule state recovery! */
3571                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3572                         return;
3573                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3574                         nfs4_schedule_lease_recovery(clp);
3575                         return;
3576                 }
3577                 nfs4_schedule_path_down_recovery(clp);
3578         }
3579         do_renew_lease(clp, timestamp);
3580 }
3581
3582 static const struct rpc_call_ops nfs4_renew_ops = {
3583         .rpc_call_done = nfs4_renew_done,
3584         .rpc_release = nfs4_renew_release,
3585 };
3586
3587 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3588 {
3589         struct rpc_message msg = {
3590                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3591                 .rpc_argp       = clp,
3592                 .rpc_cred       = cred,
3593         };
3594         struct nfs4_renewdata *data;
3595
3596         if (renew_flags == 0)
3597                 return 0;
3598         if (!atomic_inc_not_zero(&clp->cl_count))
3599                 return -EIO;
3600         data = kmalloc(sizeof(*data), GFP_NOFS);
3601         if (data == NULL)
3602                 return -ENOMEM;
3603         data->client = clp;
3604         data->timestamp = jiffies;
3605         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3606                         &nfs4_renew_ops, data);
3607 }
3608
3609 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3610 {
3611         struct rpc_message msg = {
3612                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3613                 .rpc_argp       = clp,
3614                 .rpc_cred       = cred,
3615         };
3616         unsigned long now = jiffies;
3617         int status;
3618
3619         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3620         if (status < 0)
3621                 return status;
3622         do_renew_lease(clp, now);
3623         return 0;
3624 }
3625
3626 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3627 {
3628         return (server->caps & NFS_CAP_ACLS)
3629                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3630                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3631 }
3632
3633 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3634  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3635  * the stack.
3636  */
3637 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3638
3639 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3640                 struct page **pages, unsigned int *pgbase)
3641 {
3642         struct page *newpage, **spages;
3643         int rc = 0;
3644         size_t len;
3645         spages = pages;
3646
3647         do {
3648                 len = min_t(size_t, PAGE_SIZE, buflen);
3649                 newpage = alloc_page(GFP_KERNEL);
3650
3651                 if (newpage == NULL)
3652                         goto unwind;
3653                 memcpy(page_address(newpage), buf, len);
3654                 buf += len;
3655                 buflen -= len;
3656                 *pages++ = newpage;
3657                 rc++;
3658         } while (buflen != 0);
3659
3660         return rc;
3661
3662 unwind:
3663         for(; rc > 0; rc--)
3664                 __free_page(spages[rc-1]);
3665         return -ENOMEM;
3666 }
3667
3668 struct nfs4_cached_acl {
3669         int cached;
3670         size_t len;
3671         char data[0];
3672 };
3673
3674 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3675 {
3676         struct nfs_inode *nfsi = NFS_I(inode);
3677
3678         spin_lock(&inode->i_lock);
3679         kfree(nfsi->nfs4_acl);
3680         nfsi->nfs4_acl = acl;
3681         spin_unlock(&inode->i_lock);
3682 }
3683
3684 static void nfs4_zap_acl_attr(struct inode *inode)
3685 {
3686         nfs4_set_cached_acl(inode, NULL);
3687 }
3688
3689 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3690 {
3691         struct nfs_inode *nfsi = NFS_I(inode);
3692         struct nfs4_cached_acl *acl;
3693         int ret = -ENOENT;
3694
3695         spin_lock(&inode->i_lock);
3696         acl = nfsi->nfs4_acl;
3697         if (acl == NULL)
3698                 goto out;
3699         if (buf == NULL) /* user is just asking for length */
3700                 goto out_len;
3701         if (acl->cached == 0)
3702                 goto out;
3703         ret = -ERANGE; /* see getxattr(2) man page */
3704         if (acl->len > buflen)
3705                 goto out;
3706         memcpy(buf, acl->data, acl->len);
3707 out_len:
3708         ret = acl->len;
3709 out:
3710         spin_unlock(&inode->i_lock);
3711         return ret;
3712 }
3713
3714 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3715 {
3716         struct nfs4_cached_acl *acl;
3717         size_t buflen = sizeof(*acl) + acl_len;
3718
3719         if (buflen <= PAGE_SIZE) {
3720                 acl = kmalloc(buflen, GFP_KERNEL);
3721                 if (acl == NULL)
3722                         goto out;
3723                 acl->cached = 1;
3724                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3725         } else {
3726                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3727                 if (acl == NULL)
3728                         goto out;
3729                 acl->cached = 0;
3730         }
3731         acl->len = acl_len;
3732 out:
3733         nfs4_set_cached_acl(inode, acl);
3734 }
3735
3736 /*
3737  * The getxattr API returns the required buffer length when called with a
3738  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3739  * the required buf.  On a NULL buf, we send a page of data to the server
3740  * guessing that the ACL request can be serviced by a page. If so, we cache
3741  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3742  * the cache. If not so, we throw away the page, and cache the required
3743  * length. The next getxattr call will then produce another round trip to
3744  * the server, this time with the input buf of the required size.
3745  */
3746 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3747 {
3748         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3749         struct nfs_getaclargs args = {
3750                 .fh = NFS_FH(inode),
3751                 .acl_pages = pages,
3752                 .acl_len = buflen,
3753         };
3754         struct nfs_getaclres res = {
3755                 .acl_len = buflen,
3756         };
3757         struct rpc_message msg = {
3758                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3759                 .rpc_argp = &args,
3760                 .rpc_resp = &res,
3761         };
3762         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3763         int ret = -ENOMEM, i;
3764
3765         /* As long as we're doing a round trip to the server anyway,
3766          * let's be prepared for a page of acl data. */
3767         if (npages == 0)
3768                 npages = 1;
3769         if (npages > ARRAY_SIZE(pages))
3770                 return -ERANGE;
3771
3772         for (i = 0; i < npages; i++) {
3773                 pages[i] = alloc_page(GFP_KERNEL);
3774                 if (!pages[i])
3775                         goto out_free;
3776         }
3777
3778         /* for decoding across pages */
3779         res.acl_scratch = alloc_page(GFP_KERNEL);
3780         if (!res.acl_scratch)
3781                 goto out_free;
3782
3783         args.acl_len = npages * PAGE_SIZE;
3784         args.acl_pgbase = 0;
3785
3786         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3787                 __func__, buf, buflen, npages, args.acl_len);
3788         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3789                              &msg, &args.seq_args, &res.seq_res, 0);
3790         if (ret)
3791                 goto out_free;
3792
3793         /* Handle the case where the passed-in buffer is too short */
3794         if (res.acl_flags & NFS4_ACL_TRUNC) {
3795                 /* Did the user only issue a request for the acl length? */
3796                 if (buf == NULL)
3797                         goto out_ok;
3798                 ret = -ERANGE;
3799                 goto out_free;
3800         }
3801         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3802         if (buf) {
3803                 if (res.acl_len > buflen) {
3804                         ret = -ERANGE;
3805                         goto out_free;
3806                 }
3807                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3808         }
3809 out_ok:
3810         ret = res.acl_len;
3811 out_free:
3812         for (i = 0; i < npages; i++)
3813                 if (pages[i])
3814                         __free_page(pages[i]);
3815         if (res.acl_scratch)
3816                 __free_page(res.acl_scratch);
3817         return ret;
3818 }
3819
3820 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3821 {
3822         struct nfs4_exception exception = { };
3823         ssize_t ret;
3824         do {
3825                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3826                 if (ret >= 0)
3827                         break;
3828                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3829         } while (exception.retry);
3830         return ret;
3831 }
3832
3833 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3834 {
3835         struct nfs_server *server = NFS_SERVER(inode);
3836         int ret;
3837
3838         if (!nfs4_server_supports_acls(server))
3839                 return -EOPNOTSUPP;
3840         ret = nfs_revalidate_inode(server, inode);
3841         if (ret < 0)
3842                 return ret;
3843         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3844                 nfs_zap_acl_cache(inode);
3845         ret = nfs4_read_cached_acl(inode, buf, buflen);
3846         if (ret != -ENOENT)
3847                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3848                  * but no cached acl data, just the acl length */
3849                 return ret;
3850         return nfs4_get_acl_uncached(inode, buf, buflen);
3851 }
3852
3853 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3854 {
3855         struct nfs_server *server = NFS_SERVER(inode);
3856         struct page *pages[NFS4ACL_MAXPAGES];
3857         struct nfs_setaclargs arg = {
3858                 .fh             = NFS_FH(inode),
3859                 .acl_pages      = pages,
3860                 .acl_len        = buflen,
3861         };
3862         struct nfs_setaclres res;
3863         struct rpc_message msg = {
3864                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3865                 .rpc_argp       = &arg,
3866                 .rpc_resp       = &res,
3867         };
3868         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3869         int ret, i;
3870
3871         if (!nfs4_server_supports_acls(server))
3872                 return -EOPNOTSUPP;
3873         if (npages > ARRAY_SIZE(pages))
3874                 return -ERANGE;
3875         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3876         if (i < 0)
3877                 return i;
3878         nfs4_inode_return_delegation(inode);
3879         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3880
3881         /*
3882          * Free each page after tx, so the only ref left is
3883          * held by the network stack
3884          */
3885         for (; i > 0; i--)
3886                 put_page(pages[i-1]);
3887
3888         /*
3889          * Acl update can result in inode attribute update.
3890          * so mark the attribute cache invalid.
3891          */
3892         spin_lock(&inode->i_lock);
3893         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3894         spin_unlock(&inode->i_lock);
3895         nfs_access_zap_cache(inode);
3896         nfs_zap_acl_cache(inode);
3897         return ret;
3898 }
3899
3900 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3901 {
3902         struct nfs4_exception exception = { };
3903         int err;
3904         do {
3905                 err = nfs4_handle_exception(NFS_SERVER(inode),
3906                                 __nfs4_proc_set_acl(inode, buf, buflen),
3907                                 &exception);
3908         } while (exception.retry);
3909         return err;
3910 }
3911
3912 static int
3913 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3914 {
3915         struct nfs_client *clp = server->nfs_client;
3916
3917         if (task->tk_status >= 0)
3918                 return 0;
3919         switch(task->tk_status) {
3920                 case -NFS4ERR_DELEG_REVOKED:
3921                 case -NFS4ERR_ADMIN_REVOKED:
3922                 case -NFS4ERR_BAD_STATEID:
3923                         if (state == NULL)
3924                                 break;
3925                         nfs_remove_bad_delegation(state->inode);
3926                 case -NFS4ERR_OPENMODE:
3927                         if (state == NULL)
3928                                 break;
3929                         nfs4_schedule_stateid_recovery(server, state);
3930                         goto wait_on_recovery;
3931                 case -NFS4ERR_EXPIRED:
3932                         if (state != NULL)
3933                                 nfs4_schedule_stateid_recovery(server, state);
3934                 case -NFS4ERR_STALE_STATEID:
3935                 case -NFS4ERR_STALE_CLIENTID:
3936                         nfs4_schedule_lease_recovery(clp);
3937                         goto wait_on_recovery;
3938 #if defined(CONFIG_NFS_V4_1)
3939                 case -NFS4ERR_BADSESSION:
3940                 case -NFS4ERR_BADSLOT:
3941                 case -NFS4ERR_BAD_HIGH_SLOT:
3942                 case -NFS4ERR_DEADSESSION:
3943                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3944                 case -NFS4ERR_SEQ_FALSE_RETRY:
3945                 case -NFS4ERR_SEQ_MISORDERED:
3946                         dprintk("%s ERROR %d, Reset session\n", __func__,
3947                                 task->tk_status);
3948                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3949                         task->tk_status = 0;
3950                         return -EAGAIN;
3951 #endif /* CONFIG_NFS_V4_1 */
3952                 case -NFS4ERR_DELAY:
3953                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3954                 case -NFS4ERR_GRACE:
3955                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3956                         task->tk_status = 0;
3957                         return -EAGAIN;
3958                 case -NFS4ERR_RETRY_UNCACHED_REP:
3959                 case -NFS4ERR_OLD_STATEID:
3960                         task->tk_status = 0;
3961                         return -EAGAIN;
3962         }
3963         task->tk_status = nfs4_map_errors(task->tk_status);
3964         return 0;
3965 wait_on_recovery:
3966         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3967         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3968                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3969         task->tk_status = 0;
3970         return -EAGAIN;
3971 }
3972
3973 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3974                                     nfs4_verifier *bootverf)
3975 {
3976         __be32 verf[2];
3977
3978         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3979                 /* An impossible timestamp guarantees this value
3980                  * will never match a generated boot time. */
3981                 verf[0] = 0;
3982                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3983         } else {
3984                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3985                 verf[0] = (__be32)nn->boot_time.tv_sec;
3986                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3987         }
3988         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3989 }
3990
3991 static unsigned int
3992 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
3993                                    char *buf, size_t len)
3994 {
3995         unsigned int result;
3996
3997         rcu_read_lock();
3998         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
3999                                 clp->cl_ipaddr,
4000                                 rpc_peeraddr2str(clp->cl_rpcclient,
4001                                                         RPC_DISPLAY_ADDR),
4002                                 rpc_peeraddr2str(clp->cl_rpcclient,
4003                                                         RPC_DISPLAY_PROTO));
4004         rcu_read_unlock();
4005         return result;
4006 }
4007
4008 static unsigned int
4009 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4010                                 char *buf, size_t len)
4011 {
4012         char *nodename = clp->cl_rpcclient->cl_nodename;
4013
4014         if (nfs4_client_id_uniquifier[0] != '\0')
4015                 nodename = nfs4_client_id_uniquifier;
4016         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4017                                 clp->rpc_ops->version, clp->cl_minorversion,
4018                                 nodename);
4019 }
4020
4021 /**
4022  * nfs4_proc_setclientid - Negotiate client ID
4023  * @clp: state data structure
4024  * @program: RPC program for NFSv4 callback service
4025  * @port: IP port number for NFS4 callback service
4026  * @cred: RPC credential to use for this call
4027  * @res: where to place the result
4028  *
4029  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4030  */
4031 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4032                 unsigned short port, struct rpc_cred *cred,
4033                 struct nfs4_setclientid_res *res)
4034 {
4035         nfs4_verifier sc_verifier;
4036         struct nfs4_setclientid setclientid = {
4037                 .sc_verifier = &sc_verifier,
4038                 .sc_prog = program,
4039                 .sc_cb_ident = clp->cl_cb_ident,
4040         };
4041         struct rpc_message msg = {
4042                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4043                 .rpc_argp = &setclientid,
4044                 .rpc_resp = res,
4045                 .rpc_cred = cred,
4046         };
4047         int status;
4048
4049         /* nfs_client_id4 */
4050         nfs4_init_boot_verifier(clp, &sc_verifier);
4051         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4052                 setclientid.sc_name_len =
4053                                 nfs4_init_uniform_client_string(clp,
4054                                                 setclientid.sc_name,
4055                                                 sizeof(setclientid.sc_name));
4056         else
4057                 setclientid.sc_name_len =
4058                                 nfs4_init_nonuniform_client_string(clp,
4059                                                 setclientid.sc_name,
4060                                                 sizeof(setclientid.sc_name));
4061         /* cb_client4 */
4062         rcu_read_lock();
4063         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4064                                 sizeof(setclientid.sc_netid),
4065                                 rpc_peeraddr2str(clp->cl_rpcclient,
4066                                                         RPC_DISPLAY_NETID));
4067         rcu_read_unlock();
4068         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4069                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4070                                 clp->cl_ipaddr, port >> 8, port & 255);
4071
4072         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4073                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4074                 setclientid.sc_name_len, setclientid.sc_name);
4075         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4076         dprintk("NFS reply setclientid: %d\n", status);
4077         return status;
4078 }
4079
4080 /**
4081  * nfs4_proc_setclientid_confirm - Confirm client ID
4082  * @clp: state data structure
4083  * @res: result of a previous SETCLIENTID
4084  * @cred: RPC credential to use for this call
4085  *
4086  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4087  */
4088 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4089                 struct nfs4_setclientid_res *arg,
4090                 struct rpc_cred *cred)
4091 {
4092         struct nfs_fsinfo fsinfo;
4093         struct rpc_message msg = {
4094                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4095                 .rpc_argp = arg,
4096                 .rpc_resp = &fsinfo,
4097                 .rpc_cred = cred,
4098         };
4099         unsigned long now;
4100         int status;
4101
4102         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4103                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4104                 clp->cl_clientid);
4105         now = jiffies;
4106         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4107         if (status == 0) {
4108                 spin_lock(&clp->cl_lock);
4109                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4110                 clp->cl_last_renewal = now;
4111                 spin_unlock(&clp->cl_lock);
4112         }
4113         dprintk("NFS reply setclientid_confirm: %d\n", status);
4114         return status;
4115 }
4116
4117 struct nfs4_delegreturndata {
4118         struct nfs4_delegreturnargs args;
4119         struct nfs4_delegreturnres res;
4120         struct nfs_fh fh;
4121         nfs4_stateid stateid;
4122         unsigned long timestamp;
4123         struct nfs_fattr fattr;
4124         int rpc_status;
4125 };
4126
4127 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4128 {
4129         struct nfs4_delegreturndata *data = calldata;
4130
4131         if (!nfs4_sequence_done(task, &data->res.seq_res))
4132                 return;
4133
4134         switch (task->tk_status) {
4135         case -NFS4ERR_STALE_STATEID:
4136         case -NFS4ERR_EXPIRED:
4137         case 0:
4138                 renew_lease(data->res.server, data->timestamp);
4139                 break;
4140         default:
4141                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4142                                 -EAGAIN) {
4143                         rpc_restart_call_prepare(task);
4144                         return;
4145                 }
4146         }
4147         data->rpc_status = task->tk_status;
4148 }
4149
4150 static void nfs4_delegreturn_release(void *calldata)
4151 {
4152         kfree(calldata);
4153 }
4154
4155 #if defined(CONFIG_NFS_V4_1)
4156 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4157 {
4158         struct nfs4_delegreturndata *d_data;
4159
4160         d_data = (struct nfs4_delegreturndata *)data;
4161
4162         nfs4_setup_sequence(d_data->res.server,
4163                         &d_data->args.seq_args,
4164                         &d_data->res.seq_res,
4165                         task);
4166 }
4167 #endif /* CONFIG_NFS_V4_1 */
4168
4169 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4170 #if defined(CONFIG_NFS_V4_1)
4171         .rpc_call_prepare = nfs4_delegreturn_prepare,
4172 #endif /* CONFIG_NFS_V4_1 */
4173         .rpc_call_done = nfs4_delegreturn_done,
4174         .rpc_release = nfs4_delegreturn_release,
4175 };
4176
4177 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4178 {
4179         struct nfs4_delegreturndata *data;
4180         struct nfs_server *server = NFS_SERVER(inode);
4181         struct rpc_task *task;
4182         struct rpc_message msg = {
4183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4184                 .rpc_cred = cred,
4185         };
4186         struct rpc_task_setup task_setup_data = {
4187                 .rpc_client = server->client,
4188                 .rpc_message = &msg,
4189                 .callback_ops = &nfs4_delegreturn_ops,
4190                 .flags = RPC_TASK_ASYNC,
4191         };
4192         int status = 0;
4193
4194         data = kzalloc(sizeof(*data), GFP_NOFS);
4195         if (data == NULL)
4196                 return -ENOMEM;
4197         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4198         data->args.fhandle = &data->fh;
4199         data->args.stateid = &data->stateid;
4200         data->args.bitmask = server->cache_consistency_bitmask;
4201         nfs_copy_fh(&data->fh, NFS_FH(inode));
4202         nfs4_stateid_copy(&data->stateid, stateid);
4203         data->res.fattr = &data->fattr;
4204         data->res.server = server;
4205         nfs_fattr_init(data->res.fattr);
4206         data->timestamp = jiffies;
4207         data->rpc_status = 0;
4208
4209         task_setup_data.callback_data = data;
4210         msg.rpc_argp = &data->args;
4211         msg.rpc_resp = &data->res;
4212         task = rpc_run_task(&task_setup_data);
4213         if (IS_ERR(task))
4214                 return PTR_ERR(task);
4215         if (!issync)
4216                 goto out;
4217         status = nfs4_wait_for_completion_rpc_task(task);
4218         if (status != 0)
4219                 goto out;
4220         status = data->rpc_status;
4221         if (status == 0)
4222                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4223         else
4224                 nfs_refresh_inode(inode, &data->fattr);
4225 out:
4226         rpc_put_task(task);
4227         return status;
4228 }
4229
4230 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4231 {
4232         struct nfs_server *server = NFS_SERVER(inode);
4233         struct nfs4_exception exception = { };
4234         int err;
4235         do {
4236                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4237                 switch (err) {
4238                         case -NFS4ERR_STALE_STATEID:
4239                         case -NFS4ERR_EXPIRED:
4240                         case 0:
4241                                 return 0;
4242                 }
4243                 err = nfs4_handle_exception(server, err, &exception);
4244         } while (exception.retry);
4245         return err;
4246 }
4247
4248 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4249 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4250
4251 /*
4252  * sleep, with exponential backoff, and retry the LOCK operation.
4253  */
4254 static unsigned long
4255 nfs4_set_lock_task_retry(unsigned long timeout)
4256 {
4257         freezable_schedule_timeout_killable(timeout);
4258         timeout <<= 1;
4259         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4260                 return NFS4_LOCK_MAXTIMEOUT;
4261         return timeout;
4262 }
4263
4264 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4265 {
4266         struct inode *inode = state->inode;
4267         struct nfs_server *server = NFS_SERVER(inode);
4268         struct nfs_client *clp = server->nfs_client;
4269         struct nfs_lockt_args arg = {
4270                 .fh = NFS_FH(inode),
4271                 .fl = request,
4272         };
4273         struct nfs_lockt_res res = {
4274                 .denied = request,
4275         };
4276         struct rpc_message msg = {
4277                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4278                 .rpc_argp       = &arg,
4279                 .rpc_resp       = &res,
4280                 .rpc_cred       = state->owner->so_cred,
4281         };
4282         struct nfs4_lock_state *lsp;
4283         int status;
4284
4285         arg.lock_owner.clientid = clp->cl_clientid;
4286         status = nfs4_set_lock_state(state, request);
4287         if (status != 0)
4288                 goto out;
4289         lsp = request->fl_u.nfs4_fl.owner;
4290         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4291         arg.lock_owner.s_dev = server->s_dev;
4292         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4293         switch (status) {
4294                 case 0:
4295                         request->fl_type = F_UNLCK;
4296                         break;
4297                 case -NFS4ERR_DENIED:
4298                         status = 0;
4299         }
4300         request->fl_ops->fl_release_private(request);
4301 out:
4302         return status;
4303 }
4304
4305 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4306 {
4307         struct nfs4_exception exception = { };
4308         int err;
4309
4310         do {
4311                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4312                                 _nfs4_proc_getlk(state, cmd, request),
4313                                 &exception);
4314         } while (exception.retry);
4315         return err;
4316 }
4317
4318 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4319 {
4320         int res = 0;
4321         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4322                 case FL_POSIX:
4323                         res = posix_lock_file_wait(file, fl);
4324                         break;
4325                 case FL_FLOCK:
4326                         res = flock_lock_file_wait(file, fl);
4327                         break;
4328                 default:
4329                         BUG();
4330         }
4331         return res;
4332 }
4333
4334 struct nfs4_unlockdata {
4335         struct nfs_locku_args arg;
4336         struct nfs_locku_res res;
4337         struct nfs4_lock_state *lsp;
4338         struct nfs_open_context *ctx;
4339         struct file_lock fl;
4340         const struct nfs_server *server;
4341         unsigned long timestamp;
4342 };
4343
4344 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4345                 struct nfs_open_context *ctx,
4346                 struct nfs4_lock_state *lsp,
4347                 struct nfs_seqid *seqid)
4348 {
4349         struct nfs4_unlockdata *p;
4350         struct inode *inode = lsp->ls_state->inode;
4351
4352         p = kzalloc(sizeof(*p), GFP_NOFS);
4353         if (p == NULL)
4354                 return NULL;
4355         p->arg.fh = NFS_FH(inode);
4356         p->arg.fl = &p->fl;
4357         p->arg.seqid = seqid;
4358         p->res.seqid = seqid;
4359         p->arg.stateid = &lsp->ls_stateid;
4360         p->lsp = lsp;
4361         atomic_inc(&lsp->ls_count);
4362         /* Ensure we don't close file until we're done freeing locks! */
4363         p->ctx = get_nfs_open_context(ctx);
4364         memcpy(&p->fl, fl, sizeof(p->fl));
4365         p->server = NFS_SERVER(inode);
4366         return p;
4367 }
4368
4369 static void nfs4_locku_release_calldata(void *data)
4370 {
4371         struct nfs4_unlockdata *calldata = data;
4372         nfs_free_seqid(calldata->arg.seqid);
4373         nfs4_put_lock_state(calldata->lsp);
4374         put_nfs_open_context(calldata->ctx);
4375         kfree(calldata);
4376 }
4377
4378 static void nfs4_locku_done(struct rpc_task *task, void *data)
4379 {
4380         struct nfs4_unlockdata *calldata = data;
4381
4382         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4383                 return;
4384         switch (task->tk_status) {
4385                 case 0:
4386                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4387                                         &calldata->res.stateid);
4388                         renew_lease(calldata->server, calldata->timestamp);
4389                         break;
4390                 case -NFS4ERR_BAD_STATEID:
4391                 case -NFS4ERR_OLD_STATEID:
4392                 case -NFS4ERR_STALE_STATEID:
4393                 case -NFS4ERR_EXPIRED:
4394                         break;
4395                 default:
4396                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4397                                 rpc_restart_call_prepare(task);
4398         }
4399         nfs_release_seqid(calldata->arg.seqid);
4400 }
4401
4402 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4403 {
4404         struct nfs4_unlockdata *calldata = data;
4405
4406         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4407                 return;
4408         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4409                 /* Note: exit _without_ running nfs4_locku_done */
4410                 task->tk_action = NULL;
4411                 nfs4_sequence_done(task, &calldata->res.seq_res);
4412                 return;
4413         }
4414         calldata->timestamp = jiffies;
4415         if (nfs4_setup_sequence(calldata->server,
4416                                 &calldata->arg.seq_args,
4417                                 &calldata->res.seq_res,
4418                                 task) != 0)
4419                 nfs_release_seqid(calldata->arg.seqid);
4420 }
4421
4422 static const struct rpc_call_ops nfs4_locku_ops = {
4423         .rpc_call_prepare = nfs4_locku_prepare,
4424         .rpc_call_done = nfs4_locku_done,
4425         .rpc_release = nfs4_locku_release_calldata,
4426 };
4427
4428 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4429                 struct nfs_open_context *ctx,
4430                 struct nfs4_lock_state *lsp,
4431                 struct nfs_seqid *seqid)
4432 {
4433         struct nfs4_unlockdata *data;
4434         struct rpc_message msg = {
4435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4436                 .rpc_cred = ctx->cred,
4437         };
4438         struct rpc_task_setup task_setup_data = {
4439                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4440                 .rpc_message = &msg,
4441                 .callback_ops = &nfs4_locku_ops,
4442                 .workqueue = nfsiod_workqueue,
4443                 .flags = RPC_TASK_ASYNC,
4444         };
4445
4446         /* Ensure this is an unlock - when canceling a lock, the
4447          * canceled lock is passed in, and it won't be an unlock.
4448          */
4449         fl->fl_type = F_UNLCK;
4450
4451         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4452         if (data == NULL) {
4453                 nfs_free_seqid(seqid);
4454                 return ERR_PTR(-ENOMEM);
4455         }
4456
4457         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4458         msg.rpc_argp = &data->arg;
4459         msg.rpc_resp = &data->res;
4460         task_setup_data.callback_data = data;
4461         return rpc_run_task(&task_setup_data);
4462 }
4463
4464 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4465 {
4466         struct nfs_inode *nfsi = NFS_I(state->inode);
4467         struct nfs_seqid *seqid;
4468         struct nfs4_lock_state *lsp;
4469         struct rpc_task *task;
4470         int status = 0;
4471         unsigned char fl_flags = request->fl_flags;
4472
4473         status = nfs4_set_lock_state(state, request);
4474         /* Unlock _before_ we do the RPC call */
4475         request->fl_flags |= FL_EXISTS;
4476         down_read(&nfsi->rwsem);
4477         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4478                 up_read(&nfsi->rwsem);
4479                 goto out;
4480         }
4481         up_read(&nfsi->rwsem);
4482         if (status != 0)
4483                 goto out;
4484         /* Is this a delegated lock? */
4485         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4486                 goto out;
4487         lsp = request->fl_u.nfs4_fl.owner;
4488         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4489         status = -ENOMEM;
4490         if (seqid == NULL)
4491                 goto out;
4492         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4493         status = PTR_ERR(task);
4494         if (IS_ERR(task))
4495                 goto out;
4496         status = nfs4_wait_for_completion_rpc_task(task);
4497         rpc_put_task(task);
4498 out:
4499         request->fl_flags = fl_flags;
4500         return status;
4501 }
4502
4503 struct nfs4_lockdata {
4504         struct nfs_lock_args arg;
4505         struct nfs_lock_res res;
4506         struct nfs4_lock_state *lsp;
4507         struct nfs_open_context *ctx;
4508         struct file_lock fl;
4509         unsigned long timestamp;
4510         int rpc_status;
4511         int cancelled;
4512         struct nfs_server *server;
4513 };
4514
4515 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4516                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4517                 gfp_t gfp_mask)
4518 {
4519         struct nfs4_lockdata *p;
4520         struct inode *inode = lsp->ls_state->inode;
4521         struct nfs_server *server = NFS_SERVER(inode);
4522
4523         p = kzalloc(sizeof(*p), gfp_mask);
4524         if (p == NULL)
4525                 return NULL;
4526
4527         p->arg.fh = NFS_FH(inode);
4528         p->arg.fl = &p->fl;
4529         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4530         if (p->arg.open_seqid == NULL)
4531                 goto out_free;
4532         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4533         if (p->arg.lock_seqid == NULL)
4534                 goto out_free_seqid;
4535         p->arg.lock_stateid = &lsp->ls_stateid;
4536         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4537         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4538         p->arg.lock_owner.s_dev = server->s_dev;
4539         p->res.lock_seqid = p->arg.lock_seqid;
4540         p->lsp = lsp;
4541         p->server = server;
4542         atomic_inc(&lsp->ls_count);
4543         p->ctx = get_nfs_open_context(ctx);
4544         memcpy(&p->fl, fl, sizeof(p->fl));
4545         return p;
4546 out_free_seqid:
4547         nfs_free_seqid(p->arg.open_seqid);
4548 out_free:
4549         kfree(p);
4550         return NULL;
4551 }
4552
4553 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4554 {
4555         struct nfs4_lockdata *data = calldata;
4556         struct nfs4_state *state = data->lsp->ls_state;
4557
4558         dprintk("%s: begin!\n", __func__);
4559         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4560                 return;
4561         /* Do we need to do an open_to_lock_owner? */
4562         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4563                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4564                         goto out_release_lock_seqid;
4565                 }
4566                 data->arg.open_stateid = &state->stateid;
4567                 data->arg.new_lock_owner = 1;
4568                 data->res.open_seqid = data->arg.open_seqid;
4569         } else
4570                 data->arg.new_lock_owner = 0;
4571         data->timestamp = jiffies;
4572         if (nfs4_setup_sequence(data->server,
4573                                 &data->arg.seq_args,
4574                                 &data->res.seq_res,
4575                                 task) == 0)
4576                 return;
4577         nfs_release_seqid(data->arg.open_seqid);
4578 out_release_lock_seqid:
4579         nfs_release_seqid(data->arg.lock_seqid);
4580         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4581 }
4582
4583 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4584 {
4585         struct nfs4_lockdata *data = calldata;
4586
4587         dprintk("%s: begin!\n", __func__);
4588
4589         if (!nfs4_sequence_done(task, &data->res.seq_res))
4590                 return;
4591
4592         data->rpc_status = task->tk_status;
4593         if (data->arg.new_lock_owner != 0) {
4594                 if (data->rpc_status == 0)
4595                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4596                 else
4597                         goto out;
4598         }
4599         if (data->rpc_status == 0) {
4600                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4601                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4602                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4603         }
4604 out:
4605         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4606 }
4607
4608 static void nfs4_lock_release(void *calldata)
4609 {
4610         struct nfs4_lockdata *data = calldata;
4611
4612         dprintk("%s: begin!\n", __func__);
4613         nfs_free_seqid(data->arg.open_seqid);
4614         if (data->cancelled != 0) {
4615                 struct rpc_task *task;
4616                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4617                                 data->arg.lock_seqid);
4618                 if (!IS_ERR(task))
4619                         rpc_put_task_async(task);
4620                 dprintk("%s: cancelling lock!\n", __func__);
4621         } else
4622                 nfs_free_seqid(data->arg.lock_seqid);
4623         nfs4_put_lock_state(data->lsp);
4624         put_nfs_open_context(data->ctx);
4625         kfree(data);
4626         dprintk("%s: done!\n", __func__);
4627 }
4628
4629 static const struct rpc_call_ops nfs4_lock_ops = {
4630         .rpc_call_prepare = nfs4_lock_prepare,
4631         .rpc_call_done = nfs4_lock_done,
4632         .rpc_release = nfs4_lock_release,
4633 };
4634
4635 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4636 {
4637         switch (error) {
4638         case -NFS4ERR_ADMIN_REVOKED:
4639         case -NFS4ERR_BAD_STATEID:
4640                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4641                 if (new_lock_owner != 0 ||
4642                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4643                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4644                 break;
4645         case -NFS4ERR_STALE_STATEID:
4646                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4647         case -NFS4ERR_EXPIRED:
4648                 nfs4_schedule_lease_recovery(server->nfs_client);
4649         };
4650 }
4651
4652 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4653 {
4654         struct nfs4_lockdata *data;
4655         struct rpc_task *task;
4656         struct rpc_message msg = {
4657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4658                 .rpc_cred = state->owner->so_cred,
4659         };
4660         struct rpc_task_setup task_setup_data = {
4661                 .rpc_client = NFS_CLIENT(state->inode),
4662                 .rpc_message = &msg,
4663                 .callback_ops = &nfs4_lock_ops,
4664                 .workqueue = nfsiod_workqueue,
4665                 .flags = RPC_TASK_ASYNC,
4666         };
4667         int ret;
4668
4669         dprintk("%s: begin!\n", __func__);
4670         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4671                         fl->fl_u.nfs4_fl.owner,
4672                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4673         if (data == NULL)
4674                 return -ENOMEM;
4675         if (IS_SETLKW(cmd))
4676                 data->arg.block = 1;
4677         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4678         msg.rpc_argp = &data->arg;
4679         msg.rpc_resp = &data->res;
4680         task_setup_data.callback_data = data;
4681         if (recovery_type > NFS_LOCK_NEW) {
4682                 if (recovery_type == NFS_LOCK_RECLAIM)
4683                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4684                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4685         }
4686         task = rpc_run_task(&task_setup_data);
4687         if (IS_ERR(task))
4688                 return PTR_ERR(task);
4689         ret = nfs4_wait_for_completion_rpc_task(task);
4690         if (ret == 0) {
4691                 ret = data->rpc_status;
4692                 if (ret)
4693                         nfs4_handle_setlk_error(data->server, data->lsp,
4694                                         data->arg.new_lock_owner, ret);
4695         } else
4696                 data->cancelled = 1;
4697         rpc_put_task(task);
4698         dprintk("%s: done, ret = %d!\n", __func__, ret);
4699         return ret;
4700 }
4701
4702 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4703 {
4704         struct nfs_server *server = NFS_SERVER(state->inode);
4705         struct nfs4_exception exception = {
4706                 .inode = state->inode,
4707         };
4708         int err;
4709
4710         do {
4711                 /* Cache the lock if possible... */
4712                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4713                         return 0;
4714                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4715                 if (err != -NFS4ERR_DELAY)
4716                         break;
4717                 nfs4_handle_exception(server, err, &exception);
4718         } while (exception.retry);
4719         return err;
4720 }
4721
4722 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4723 {
4724         struct nfs_server *server = NFS_SERVER(state->inode);
4725         struct nfs4_exception exception = {
4726                 .inode = state->inode,
4727         };
4728         int err;
4729
4730         err = nfs4_set_lock_state(state, request);
4731         if (err != 0)
4732                 return err;
4733         do {
4734                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4735                         return 0;
4736                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4737                 switch (err) {
4738                 default:
4739                         goto out;
4740                 case -NFS4ERR_GRACE:
4741                 case -NFS4ERR_DELAY:
4742                         nfs4_handle_exception(server, err, &exception);
4743                         err = 0;
4744                 }
4745         } while (exception.retry);
4746 out:
4747         return err;
4748 }
4749
4750 #if defined(CONFIG_NFS_V4_1)
4751 /**
4752  * nfs41_check_expired_locks - possibly free a lock stateid
4753  *
4754  * @state: NFSv4 state for an inode
4755  *
4756  * Returns NFS_OK if recovery for this stateid is now finished.
4757  * Otherwise a negative NFS4ERR value is returned.
4758  */
4759 static int nfs41_check_expired_locks(struct nfs4_state *state)
4760 {
4761         int status, ret = -NFS4ERR_BAD_STATEID;
4762         struct nfs4_lock_state *lsp;
4763         struct nfs_server *server = NFS_SERVER(state->inode);
4764
4765         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4766                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4767                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4768                         if (status != NFS_OK) {
4769                                 /* Free the stateid unless the server
4770                                  * informs us the stateid is unrecognized. */
4771                                 if (status != -NFS4ERR_BAD_STATEID)
4772                                         nfs41_free_stateid(server,
4773                                                         &lsp->ls_stateid);
4774                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4775                                 ret = status;
4776                         }
4777                 }
4778         };
4779
4780         return ret;
4781 }
4782
4783 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4784 {
4785         int status = NFS_OK;
4786
4787         if (test_bit(LK_STATE_IN_USE, &state->flags))
4788                 status = nfs41_check_expired_locks(state);
4789         if (status != NFS_OK)
4790                 status = nfs4_lock_expired(state, request);
4791         return status;
4792 }
4793 #endif
4794
4795 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4796 {
4797         struct nfs_inode *nfsi = NFS_I(state->inode);
4798         unsigned char fl_flags = request->fl_flags;
4799         int status = -ENOLCK;
4800
4801         if ((fl_flags & FL_POSIX) &&
4802                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4803                 goto out;
4804         /* Is this a delegated open? */
4805         status = nfs4_set_lock_state(state, request);
4806         if (status != 0)
4807                 goto out;
4808         request->fl_flags |= FL_ACCESS;
4809         status = do_vfs_lock(request->fl_file, request);
4810         if (status < 0)
4811                 goto out;
4812         down_read(&nfsi->rwsem);
4813         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4814                 /* Yes: cache locks! */
4815                 /* ...but avoid races with delegation recall... */
4816                 request->fl_flags = fl_flags & ~FL_SLEEP;
4817                 status = do_vfs_lock(request->fl_file, request);
4818                 goto out_unlock;
4819         }
4820         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4821         if (status != 0)
4822                 goto out_unlock;
4823         /* Note: we always want to sleep here! */
4824         request->fl_flags = fl_flags | FL_SLEEP;
4825         if (do_vfs_lock(request->fl_file, request) < 0)
4826                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4827                         "manager!\n", __func__);
4828 out_unlock:
4829         up_read(&nfsi->rwsem);
4830 out:
4831         request->fl_flags = fl_flags;
4832         return status;
4833 }
4834
4835 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4836 {
4837         struct nfs4_exception exception = {
4838                 .state = state,
4839                 .inode = state->inode,
4840         };
4841         int err;
4842
4843         do {
4844                 err = _nfs4_proc_setlk(state, cmd, request);
4845                 if (err == -NFS4ERR_DENIED)
4846                         err = -EAGAIN;
4847                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4848                                 err, &exception);
4849         } while (exception.retry);
4850         return err;
4851 }
4852
4853 static int
4854 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4855 {
4856         struct nfs_open_context *ctx;
4857         struct nfs4_state *state;
4858         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4859         int status;
4860
4861         /* verify open state */
4862         ctx = nfs_file_open_context(filp);
4863         state = ctx->state;
4864
4865         if (request->fl_start < 0 || request->fl_end < 0)
4866                 return -EINVAL;
4867
4868         if (IS_GETLK(cmd)) {
4869                 if (state != NULL)
4870                         return nfs4_proc_getlk(state, F_GETLK, request);
4871                 return 0;
4872         }
4873
4874         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4875                 return -EINVAL;
4876
4877         if (request->fl_type == F_UNLCK) {
4878                 if (state != NULL)
4879                         return nfs4_proc_unlck(state, cmd, request);
4880                 return 0;
4881         }
4882
4883         if (state == NULL)
4884                 return -ENOLCK;
4885         /*
4886          * Don't rely on the VFS having checked the file open mode,
4887          * since it won't do this for flock() locks.
4888          */
4889         switch (request->fl_type) {
4890         case F_RDLCK:
4891                 if (!(filp->f_mode & FMODE_READ))
4892                         return -EBADF;
4893                 break;
4894         case F_WRLCK:
4895                 if (!(filp->f_mode & FMODE_WRITE))
4896                         return -EBADF;
4897         }
4898
4899         do {
4900                 status = nfs4_proc_setlk(state, cmd, request);
4901                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4902                         break;
4903                 timeout = nfs4_set_lock_task_retry(timeout);
4904                 status = -ERESTARTSYS;
4905                 if (signalled())
4906                         break;
4907         } while(status < 0);
4908         return status;
4909 }
4910
4911 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4912 {
4913         struct nfs_server *server = NFS_SERVER(state->inode);
4914         struct nfs4_exception exception = { };
4915         int err;
4916
4917         err = nfs4_set_lock_state(state, fl);
4918         if (err != 0)
4919                 goto out;
4920         do {
4921                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4922                 switch (err) {
4923                         default:
4924                                 printk(KERN_ERR "NFS: %s: unhandled error "
4925                                         "%d.\n", __func__, err);
4926                         case 0:
4927                         case -ESTALE:
4928                                 goto out;
4929                         case -NFS4ERR_EXPIRED:
4930                                 nfs4_schedule_stateid_recovery(server, state);
4931                         case -NFS4ERR_STALE_CLIENTID:
4932                         case -NFS4ERR_STALE_STATEID:
4933                                 nfs4_schedule_lease_recovery(server->nfs_client);
4934                                 goto out;
4935                         case -NFS4ERR_BADSESSION:
4936                         case -NFS4ERR_BADSLOT:
4937                         case -NFS4ERR_BAD_HIGH_SLOT:
4938                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4939                         case -NFS4ERR_DEADSESSION:
4940                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4941                                 goto out;
4942                         case -ERESTARTSYS:
4943                                 /*
4944                                  * The show must go on: exit, but mark the
4945                                  * stateid as needing recovery.
4946                                  */
4947                         case -NFS4ERR_DELEG_REVOKED:
4948                         case -NFS4ERR_ADMIN_REVOKED:
4949                         case -NFS4ERR_BAD_STATEID:
4950                         case -NFS4ERR_OPENMODE:
4951                                 nfs4_schedule_stateid_recovery(server, state);
4952                                 err = 0;
4953                                 goto out;
4954                         case -ENOMEM:
4955                         case -NFS4ERR_DENIED:
4956                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4957                                 err = 0;
4958                                 goto out;
4959                         case -NFS4ERR_DELAY:
4960                                 break;
4961                 }
4962                 err = nfs4_handle_exception(server, err, &exception);
4963         } while (exception.retry);
4964 out:
4965         return err;
4966 }
4967
4968 struct nfs_release_lockowner_data {
4969         struct nfs4_lock_state *lsp;
4970         struct nfs_server *server;
4971         struct nfs_release_lockowner_args args;
4972 };
4973
4974 static void nfs4_release_lockowner_release(void *calldata)
4975 {
4976         struct nfs_release_lockowner_data *data = calldata;
4977         nfs4_free_lock_state(data->server, data->lsp);
4978         kfree(calldata);
4979 }
4980
4981 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4982         .rpc_release = nfs4_release_lockowner_release,
4983 };
4984
4985 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4986 {
4987         struct nfs_server *server = lsp->ls_state->owner->so_server;
4988         struct nfs_release_lockowner_data *data;
4989         struct rpc_message msg = {
4990                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4991         };
4992
4993         if (server->nfs_client->cl_mvops->minor_version != 0)
4994                 return -EINVAL;
4995         data = kmalloc(sizeof(*data), GFP_NOFS);
4996         if (!data)
4997                 return -ENOMEM;
4998         data->lsp = lsp;
4999         data->server = server;
5000         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5001         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5002         data->args.lock_owner.s_dev = server->s_dev;
5003         msg.rpc_argp = &data->args;
5004         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5005         return 0;
5006 }
5007
5008 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5009
5010 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5011                                    const void *buf, size_t buflen,
5012                                    int flags, int type)
5013 {
5014         if (strcmp(key, "") != 0)
5015                 return -EINVAL;
5016
5017         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5018 }
5019
5020 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5021                                    void *buf, size_t buflen, int type)
5022 {
5023         if (strcmp(key, "") != 0)
5024                 return -EINVAL;
5025
5026         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5027 }
5028
5029 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5030                                        size_t list_len, const char *name,
5031                                        size_t name_len, int type)
5032 {
5033         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5034
5035         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5036                 return 0;
5037
5038         if (list && len <= list_len)
5039                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5040         return len;
5041 }
5042
5043 /*
5044  * nfs_fhget will use either the mounted_on_fileid or the fileid
5045  */
5046 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5047 {
5048         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5049                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5050               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5051               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5052                 return;
5053
5054         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5055                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5056         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5057         fattr->nlink = 2;
5058 }
5059
5060 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5061                                    const struct qstr *name,
5062                                    struct nfs4_fs_locations *fs_locations,
5063                                    struct page *page)
5064 {
5065         struct nfs_server *server = NFS_SERVER(dir);
5066         u32 bitmask[2] = {
5067                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5068         };
5069         struct nfs4_fs_locations_arg args = {
5070                 .dir_fh = NFS_FH(dir),
5071                 .name = name,
5072                 .page = page,
5073                 .bitmask = bitmask,
5074         };
5075         struct nfs4_fs_locations_res res = {
5076                 .fs_locations = fs_locations,
5077         };
5078         struct rpc_message msg = {
5079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5080                 .rpc_argp = &args,
5081                 .rpc_resp = &res,
5082         };
5083         int status;
5084
5085         dprintk("%s: start\n", __func__);
5086
5087         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5088          * is not supported */
5089         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5090                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5091         else
5092                 bitmask[0] |= FATTR4_WORD0_FILEID;
5093
5094         nfs_fattr_init(&fs_locations->fattr);
5095         fs_locations->server = server;
5096         fs_locations->nlocations = 0;
5097         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5098         dprintk("%s: returned status = %d\n", __func__, status);
5099         return status;
5100 }
5101
5102 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5103                            const struct qstr *name,
5104                            struct nfs4_fs_locations *fs_locations,
5105                            struct page *page)
5106 {
5107         struct nfs4_exception exception = { };
5108         int err;
5109         do {
5110                 err = nfs4_handle_exception(NFS_SERVER(dir),
5111                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5112                                 &exception);
5113         } while (exception.retry);
5114         return err;
5115 }
5116
5117 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5118 {
5119         int status;
5120         struct nfs4_secinfo_arg args = {
5121                 .dir_fh = NFS_FH(dir),
5122                 .name   = name,
5123         };
5124         struct nfs4_secinfo_res res = {
5125                 .flavors     = flavors,
5126         };
5127         struct rpc_message msg = {
5128                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5129                 .rpc_argp = &args,
5130                 .rpc_resp = &res,
5131         };
5132
5133         dprintk("NFS call  secinfo %s\n", name->name);
5134         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5135         dprintk("NFS reply  secinfo: %d\n", status);
5136         return status;
5137 }
5138
5139 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5140                       struct nfs4_secinfo_flavors *flavors)
5141 {
5142         struct nfs4_exception exception = { };
5143         int err;
5144         do {
5145                 err = nfs4_handle_exception(NFS_SERVER(dir),
5146                                 _nfs4_proc_secinfo(dir, name, flavors),
5147                                 &exception);
5148         } while (exception.retry);
5149         return err;
5150 }
5151
5152 #ifdef CONFIG_NFS_V4_1
5153 /*
5154  * Check the exchange flags returned by the server for invalid flags, having
5155  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5156  * DS flags set.
5157  */
5158 static int nfs4_check_cl_exchange_flags(u32 flags)
5159 {
5160         if (flags & ~EXCHGID4_FLAG_MASK_R)
5161                 goto out_inval;
5162         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5163             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5164                 goto out_inval;
5165         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5166                 goto out_inval;
5167         return NFS_OK;
5168 out_inval:
5169         return -NFS4ERR_INVAL;
5170 }
5171
5172 static bool
5173 nfs41_same_server_scope(struct nfs41_server_scope *a,
5174                         struct nfs41_server_scope *b)
5175 {
5176         if (a->server_scope_sz == b->server_scope_sz &&
5177             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5178                 return true;
5179
5180         return false;
5181 }
5182
5183 /*
5184  * nfs4_proc_bind_conn_to_session()
5185  *
5186  * The 4.1 client currently uses the same TCP connection for the
5187  * fore and backchannel.
5188  */
5189 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5190 {
5191         int status;
5192         struct nfs41_bind_conn_to_session_res res;
5193         struct rpc_message msg = {
5194                 .rpc_proc =
5195                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5196                 .rpc_argp = clp,
5197                 .rpc_resp = &res,
5198                 .rpc_cred = cred,
5199         };
5200
5201         dprintk("--> %s\n", __func__);
5202
5203         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5204         if (unlikely(res.session == NULL)) {
5205                 status = -ENOMEM;
5206                 goto out;
5207         }
5208
5209         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5210         if (status == 0) {
5211                 if (memcmp(res.session->sess_id.data,
5212                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5213                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5214                         status = -EIO;
5215                         goto out_session;
5216                 }
5217                 if (res.dir != NFS4_CDFS4_BOTH) {
5218                         dprintk("NFS: %s: Unexpected direction from server\n",
5219                                 __func__);
5220                         status = -EIO;
5221                         goto out_session;
5222                 }
5223                 if (res.use_conn_in_rdma_mode) {
5224                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5225                                 __func__);
5226                         status = -EIO;
5227                         goto out_session;
5228                 }
5229         }
5230 out_session:
5231         kfree(res.session);
5232 out:
5233         dprintk("<-- %s status= %d\n", __func__, status);
5234         return status;
5235 }
5236
5237 /*
5238  * nfs4_proc_exchange_id()
5239  *
5240  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5241  *
5242  * Since the clientid has expired, all compounds using sessions
5243  * associated with the stale clientid will be returning
5244  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5245  * be in some phase of session reset.
5246  */
5247 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5248 {
5249         nfs4_verifier verifier;
5250         struct nfs41_exchange_id_args args = {
5251                 .verifier = &verifier,
5252                 .client = clp,
5253                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5254         };
5255         struct nfs41_exchange_id_res res = {
5256                 0
5257         };
5258         int status;
5259         struct rpc_message msg = {
5260                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5261                 .rpc_argp = &args,
5262                 .rpc_resp = &res,
5263                 .rpc_cred = cred,
5264         };
5265
5266         nfs4_init_boot_verifier(clp, &verifier);
5267         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5268                                                         sizeof(args.id));
5269         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5270                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5271                 args.id_len, args.id);
5272
5273         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5274                                         GFP_NOFS);
5275         if (unlikely(res.server_owner == NULL)) {
5276                 status = -ENOMEM;
5277                 goto out;
5278         }
5279
5280         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5281                                         GFP_NOFS);
5282         if (unlikely(res.server_scope == NULL)) {
5283                 status = -ENOMEM;
5284                 goto out_server_owner;
5285         }
5286
5287         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5288         if (unlikely(res.impl_id == NULL)) {
5289                 status = -ENOMEM;
5290                 goto out_server_scope;
5291         }
5292
5293         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5294         if (status == 0)
5295                 status = nfs4_check_cl_exchange_flags(res.flags);
5296
5297         if (status == 0) {
5298                 clp->cl_clientid = res.clientid;
5299                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5300                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5301                         clp->cl_seqid = res.seqid;
5302
5303                 kfree(clp->cl_serverowner);
5304                 clp->cl_serverowner = res.server_owner;
5305                 res.server_owner = NULL;
5306
5307                 /* use the most recent implementation id */
5308                 kfree(clp->cl_implid);
5309                 clp->cl_implid = res.impl_id;
5310
5311                 if (clp->cl_serverscope != NULL &&
5312                     !nfs41_same_server_scope(clp->cl_serverscope,
5313                                              res.server_scope)) {
5314                         dprintk("%s: server_scope mismatch detected\n",
5315                                 __func__);
5316                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5317                         kfree(clp->cl_serverscope);
5318                         clp->cl_serverscope = NULL;
5319                 }
5320
5321                 if (clp->cl_serverscope == NULL) {
5322                         clp->cl_serverscope = res.server_scope;
5323                         goto out;
5324                 }
5325         } else
5326                 kfree(res.impl_id);
5327
5328 out_server_owner:
5329         kfree(res.server_owner);
5330 out_server_scope:
5331         kfree(res.server_scope);
5332 out:
5333         if (clp->cl_implid != NULL)
5334                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5335                         "domain: %s, name: %s, date: %llu,%u\n",
5336                         clp->cl_implid->domain, clp->cl_implid->name,
5337                         clp->cl_implid->date.seconds,
5338                         clp->cl_implid->date.nseconds);
5339         dprintk("NFS reply exchange_id: %d\n", status);
5340         return status;
5341 }
5342
5343 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5344                 struct rpc_cred *cred)
5345 {
5346         struct rpc_message msg = {
5347                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5348                 .rpc_argp = clp,
5349                 .rpc_cred = cred,
5350         };
5351         int status;
5352
5353         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5354         if (status)
5355                 dprintk("NFS: Got error %d from the server %s on "
5356                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5357         return status;
5358 }
5359
5360 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5361                 struct rpc_cred *cred)
5362 {
5363         unsigned int loop;
5364         int ret;
5365
5366         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5367                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5368                 switch (ret) {
5369                 case -NFS4ERR_DELAY:
5370                 case -NFS4ERR_CLIENTID_BUSY:
5371                         ssleep(1);
5372                         break;
5373                 default:
5374                         return ret;
5375                 }
5376         }
5377         return 0;
5378 }
5379
5380 int nfs4_destroy_clientid(struct nfs_client *clp)
5381 {
5382         struct rpc_cred *cred;
5383         int ret = 0;
5384
5385         if (clp->cl_mvops->minor_version < 1)
5386                 goto out;
5387         if (clp->cl_exchange_flags == 0)
5388                 goto out;
5389         if (clp->cl_preserve_clid)
5390                 goto out;
5391         cred = nfs4_get_exchange_id_cred(clp);
5392         ret = nfs4_proc_destroy_clientid(clp, cred);
5393         if (cred)
5394                 put_rpccred(cred);
5395         switch (ret) {
5396         case 0:
5397         case -NFS4ERR_STALE_CLIENTID:
5398                 clp->cl_exchange_flags = 0;
5399         }
5400 out:
5401         return ret;
5402 }
5403
5404 struct nfs4_get_lease_time_data {
5405         struct nfs4_get_lease_time_args *args;
5406         struct nfs4_get_lease_time_res *res;
5407         struct nfs_client *clp;
5408 };
5409
5410 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5411                                         void *calldata)
5412 {
5413         struct nfs4_get_lease_time_data *data =
5414                         (struct nfs4_get_lease_time_data *)calldata;
5415
5416         dprintk("--> %s\n", __func__);
5417         /* just setup sequence, do not trigger session recovery
5418            since we're invoked within one */
5419         nfs41_setup_sequence(data->clp->cl_session,
5420                         &data->args->la_seq_args,
5421                         &data->res->lr_seq_res,
5422                         task);
5423         dprintk("<-- %s\n", __func__);
5424 }
5425
5426 /*
5427  * Called from nfs4_state_manager thread for session setup, so don't recover
5428  * from sequence operation or clientid errors.
5429  */
5430 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5431 {
5432         struct nfs4_get_lease_time_data *data =
5433                         (struct nfs4_get_lease_time_data *)calldata;
5434
5435         dprintk("--> %s\n", __func__);
5436         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5437                 return;
5438         switch (task->tk_status) {
5439         case -NFS4ERR_DELAY:
5440         case -NFS4ERR_GRACE:
5441                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5442                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5443                 task->tk_status = 0;
5444                 /* fall through */
5445         case -NFS4ERR_RETRY_UNCACHED_REP:
5446                 rpc_restart_call_prepare(task);
5447                 return;
5448         }
5449         dprintk("<-- %s\n", __func__);
5450 }
5451
5452 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5453         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5454         .rpc_call_done = nfs4_get_lease_time_done,
5455 };
5456
5457 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5458 {
5459         struct rpc_task *task;
5460         struct nfs4_get_lease_time_args args;
5461         struct nfs4_get_lease_time_res res = {
5462                 .lr_fsinfo = fsinfo,
5463         };
5464         struct nfs4_get_lease_time_data data = {
5465                 .args = &args,
5466                 .res = &res,
5467                 .clp = clp,
5468         };
5469         struct rpc_message msg = {
5470                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5471                 .rpc_argp = &args,
5472                 .rpc_resp = &res,
5473         };
5474         struct rpc_task_setup task_setup = {
5475                 .rpc_client = clp->cl_rpcclient,
5476                 .rpc_message = &msg,
5477                 .callback_ops = &nfs4_get_lease_time_ops,
5478                 .callback_data = &data,
5479                 .flags = RPC_TASK_TIMEOUT,
5480         };
5481         int status;
5482
5483         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5484         nfs4_set_sequence_privileged(&args.la_seq_args);
5485         dprintk("--> %s\n", __func__);
5486         task = rpc_run_task(&task_setup);
5487
5488         if (IS_ERR(task))
5489                 status = PTR_ERR(task);
5490         else {
5491                 status = task->tk_status;
5492                 rpc_put_task(task);
5493         }
5494         dprintk("<-- %s return %d\n", __func__, status);
5495
5496         return status;
5497 }
5498
5499 /*
5500  * Initialize the values to be used by the client in CREATE_SESSION
5501  * If nfs4_init_session set the fore channel request and response sizes,
5502  * use them.
5503  *
5504  * Set the back channel max_resp_sz_cached to zero to force the client to
5505  * always set csa_cachethis to FALSE because the current implementation
5506  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5507  */
5508 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5509 {
5510         struct nfs4_session *session = args->client->cl_session;
5511         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5512                      mxresp_sz = session->fc_target_max_resp_sz;
5513
5514         if (mxrqst_sz == 0)
5515                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5516         if (mxresp_sz == 0)
5517                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5518         /* Fore channel attributes */
5519         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5520         args->fc_attrs.max_resp_sz = mxresp_sz;
5521         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5522         args->fc_attrs.max_reqs = max_session_slots;
5523
5524         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5525                 "max_ops=%u max_reqs=%u\n",
5526                 __func__,
5527                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5528                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5529
5530         /* Back channel attributes */
5531         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5532         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5533         args->bc_attrs.max_resp_sz_cached = 0;
5534         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5535         args->bc_attrs.max_reqs = 1;
5536
5537         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5538                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5539                 __func__,
5540                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5541                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5542                 args->bc_attrs.max_reqs);
5543 }
5544
5545 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5546 {
5547         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5548         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5549
5550         if (rcvd->max_resp_sz > sent->max_resp_sz)
5551                 return -EINVAL;
5552         /*
5553          * Our requested max_ops is the minimum we need; we're not
5554          * prepared to break up compounds into smaller pieces than that.
5555          * So, no point even trying to continue if the server won't
5556          * cooperate:
5557          */
5558         if (rcvd->max_ops < sent->max_ops)
5559                 return -EINVAL;
5560         if (rcvd->max_reqs == 0)
5561                 return -EINVAL;
5562         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5563                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5564         return 0;
5565 }
5566
5567 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5568 {
5569         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5570         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5571
5572         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5573                 return -EINVAL;
5574         if (rcvd->max_resp_sz < sent->max_resp_sz)
5575                 return -EINVAL;
5576         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5577                 return -EINVAL;
5578         /* These would render the backchannel useless: */
5579         if (rcvd->max_ops != sent->max_ops)
5580                 return -EINVAL;
5581         if (rcvd->max_reqs != sent->max_reqs)
5582                 return -EINVAL;
5583         return 0;
5584 }
5585
5586 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5587                                      struct nfs4_session *session)
5588 {
5589         int ret;
5590
5591         ret = nfs4_verify_fore_channel_attrs(args, session);
5592         if (ret)
5593                 return ret;
5594         return nfs4_verify_back_channel_attrs(args, session);
5595 }
5596
5597 static int _nfs4_proc_create_session(struct nfs_client *clp,
5598                 struct rpc_cred *cred)
5599 {
5600         struct nfs4_session *session = clp->cl_session;
5601         struct nfs41_create_session_args args = {
5602                 .client = clp,
5603                 .cb_program = NFS4_CALLBACK,
5604         };
5605         struct nfs41_create_session_res res = {
5606                 .client = clp,
5607         };
5608         struct rpc_message msg = {
5609                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5610                 .rpc_argp = &args,
5611                 .rpc_resp = &res,
5612                 .rpc_cred = cred,
5613         };
5614         int status;
5615
5616         nfs4_init_channel_attrs(&args);
5617         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5618
5619         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5620
5621         if (!status) {
5622                 /* Verify the session's negotiated channel_attrs values */
5623                 status = nfs4_verify_channel_attrs(&args, session);
5624                 /* Increment the clientid slot sequence id */
5625                 clp->cl_seqid++;
5626         }
5627
5628         return status;
5629 }
5630
5631 /*
5632  * Issues a CREATE_SESSION operation to the server.
5633  * It is the responsibility of the caller to verify the session is
5634  * expired before calling this routine.
5635  */
5636 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5637 {
5638         int status;
5639         unsigned *ptr;
5640         struct nfs4_session *session = clp->cl_session;
5641
5642         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5643
5644         status = _nfs4_proc_create_session(clp, cred);
5645         if (status)
5646                 goto out;
5647
5648         /* Init or reset the session slot tables */
5649         status = nfs4_setup_session_slot_tables(session);
5650         dprintk("slot table setup returned %d\n", status);
5651         if (status)
5652                 goto out;
5653
5654         ptr = (unsigned *)&session->sess_id.data[0];
5655         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5656                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5657 out:
5658         dprintk("<-- %s\n", __func__);
5659         return status;
5660 }
5661
5662 /*
5663  * Issue the over-the-wire RPC DESTROY_SESSION.
5664  * The caller must serialize access to this routine.
5665  */
5666 int nfs4_proc_destroy_session(struct nfs4_session *session,
5667                 struct rpc_cred *cred)
5668 {
5669         struct rpc_message msg = {
5670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5671                 .rpc_argp = session,
5672                 .rpc_cred = cred,
5673         };
5674         int status = 0;
5675
5676         dprintk("--> nfs4_proc_destroy_session\n");
5677
5678         /* session is still being setup */
5679         if (session->clp->cl_cons_state != NFS_CS_READY)
5680                 return status;
5681
5682         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5683
5684         if (status)
5685                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5686                         "Session has been destroyed regardless...\n", status);
5687
5688         dprintk("<-- nfs4_proc_destroy_session\n");
5689         return status;
5690 }
5691
5692 /*
5693  * Renew the cl_session lease.
5694  */
5695 struct nfs4_sequence_data {
5696         struct nfs_client *clp;
5697         struct nfs4_sequence_args args;
5698         struct nfs4_sequence_res res;
5699 };
5700
5701 static void nfs41_sequence_release(void *data)
5702 {
5703         struct nfs4_sequence_data *calldata = data;
5704         struct nfs_client *clp = calldata->clp;
5705
5706         if (atomic_read(&clp->cl_count) > 1)
5707                 nfs4_schedule_state_renewal(clp);
5708         nfs_put_client(clp);
5709         kfree(calldata);
5710 }
5711
5712 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5713 {
5714         switch(task->tk_status) {
5715         case -NFS4ERR_DELAY:
5716                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5717                 return -EAGAIN;
5718         default:
5719                 nfs4_schedule_lease_recovery(clp);
5720         }
5721         return 0;
5722 }
5723
5724 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5725 {
5726         struct nfs4_sequence_data *calldata = data;
5727         struct nfs_client *clp = calldata->clp;
5728
5729         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5730                 return;
5731
5732         if (task->tk_status < 0) {
5733                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5734                 if (atomic_read(&clp->cl_count) == 1)
5735                         goto out;
5736
5737                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5738                         rpc_restart_call_prepare(task);
5739                         return;
5740                 }
5741         }
5742         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5743 out:
5744         dprintk("<-- %s\n", __func__);
5745 }
5746
5747 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5748 {
5749         struct nfs4_sequence_data *calldata = data;
5750         struct nfs_client *clp = calldata->clp;
5751         struct nfs4_sequence_args *args;
5752         struct nfs4_sequence_res *res;
5753
5754         args = task->tk_msg.rpc_argp;
5755         res = task->tk_msg.rpc_resp;
5756
5757         nfs41_setup_sequence(clp->cl_session, args, res, task);
5758 }
5759
5760 static const struct rpc_call_ops nfs41_sequence_ops = {
5761         .rpc_call_done = nfs41_sequence_call_done,
5762         .rpc_call_prepare = nfs41_sequence_prepare,
5763         .rpc_release = nfs41_sequence_release,
5764 };
5765
5766 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5767                 struct rpc_cred *cred,
5768                 bool is_privileged)
5769 {
5770         struct nfs4_sequence_data *calldata;
5771         struct rpc_message msg = {
5772                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5773                 .rpc_cred = cred,
5774         };
5775         struct rpc_task_setup task_setup_data = {
5776                 .rpc_client = clp->cl_rpcclient,
5777                 .rpc_message = &msg,
5778                 .callback_ops = &nfs41_sequence_ops,
5779                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5780         };
5781
5782         if (!atomic_inc_not_zero(&clp->cl_count))
5783                 return ERR_PTR(-EIO);
5784         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5785         if (calldata == NULL) {
5786                 nfs_put_client(clp);
5787                 return ERR_PTR(-ENOMEM);
5788         }
5789         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5790         if (is_privileged)
5791                 nfs4_set_sequence_privileged(&calldata->args);
5792         msg.rpc_argp = &calldata->args;
5793         msg.rpc_resp = &calldata->res;
5794         calldata->clp = clp;
5795         task_setup_data.callback_data = calldata;
5796
5797         return rpc_run_task(&task_setup_data);
5798 }
5799
5800 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5801 {
5802         struct rpc_task *task;
5803         int ret = 0;
5804
5805         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5806                 return 0;
5807         task = _nfs41_proc_sequence(clp, cred, false);
5808         if (IS_ERR(task))
5809                 ret = PTR_ERR(task);
5810         else
5811                 rpc_put_task_async(task);
5812         dprintk("<-- %s status=%d\n", __func__, ret);
5813         return ret;
5814 }
5815
5816 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5817 {
5818         struct rpc_task *task;
5819         int ret;
5820
5821         task = _nfs41_proc_sequence(clp, cred, true);
5822         if (IS_ERR(task)) {
5823                 ret = PTR_ERR(task);
5824                 goto out;
5825         }
5826         ret = rpc_wait_for_completion_task(task);
5827         if (!ret) {
5828                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5829
5830                 if (task->tk_status == 0)
5831                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5832                 ret = task->tk_status;
5833         }
5834         rpc_put_task(task);
5835 out:
5836         dprintk("<-- %s status=%d\n", __func__, ret);
5837         return ret;
5838 }
5839
5840 struct nfs4_reclaim_complete_data {
5841         struct nfs_client *clp;
5842         struct nfs41_reclaim_complete_args arg;
5843         struct nfs41_reclaim_complete_res res;
5844 };
5845
5846 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5847 {
5848         struct nfs4_reclaim_complete_data *calldata = data;
5849
5850         nfs41_setup_sequence(calldata->clp->cl_session,
5851                         &calldata->arg.seq_args,
5852                         &calldata->res.seq_res,
5853                         task);
5854 }
5855
5856 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5857 {
5858         switch(task->tk_status) {
5859         case 0:
5860         case -NFS4ERR_COMPLETE_ALREADY:
5861         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5862                 break;
5863         case -NFS4ERR_DELAY:
5864                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5865                 /* fall through */
5866         case -NFS4ERR_RETRY_UNCACHED_REP:
5867                 return -EAGAIN;
5868         default:
5869                 nfs4_schedule_lease_recovery(clp);
5870         }
5871         return 0;
5872 }
5873
5874 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5875 {
5876         struct nfs4_reclaim_complete_data *calldata = data;
5877         struct nfs_client *clp = calldata->clp;
5878         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5879
5880         dprintk("--> %s\n", __func__);
5881         if (!nfs41_sequence_done(task, res))
5882                 return;
5883
5884         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5885                 rpc_restart_call_prepare(task);
5886                 return;
5887         }
5888         dprintk("<-- %s\n", __func__);
5889 }
5890
5891 static void nfs4_free_reclaim_complete_data(void *data)
5892 {
5893         struct nfs4_reclaim_complete_data *calldata = data;
5894
5895         kfree(calldata);
5896 }
5897
5898 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5899         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5900         .rpc_call_done = nfs4_reclaim_complete_done,
5901         .rpc_release = nfs4_free_reclaim_complete_data,
5902 };
5903
5904 /*
5905  * Issue a global reclaim complete.
5906  */
5907 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5908 {
5909         struct nfs4_reclaim_complete_data *calldata;
5910         struct rpc_task *task;
5911         struct rpc_message msg = {
5912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5913         };
5914         struct rpc_task_setup task_setup_data = {
5915                 .rpc_client = clp->cl_rpcclient,
5916                 .rpc_message = &msg,
5917                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5918                 .flags = RPC_TASK_ASYNC,
5919         };
5920         int status = -ENOMEM;
5921
5922         dprintk("--> %s\n", __func__);
5923         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5924         if (calldata == NULL)
5925                 goto out;
5926         calldata->clp = clp;
5927         calldata->arg.one_fs = 0;
5928
5929         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5930         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
5931         msg.rpc_argp = &calldata->arg;
5932         msg.rpc_resp = &calldata->res;
5933         task_setup_data.callback_data = calldata;
5934         task = rpc_run_task(&task_setup_data);
5935         if (IS_ERR(task)) {
5936                 status = PTR_ERR(task);
5937                 goto out;
5938         }
5939         status = nfs4_wait_for_completion_rpc_task(task);
5940         if (status == 0)
5941                 status = task->tk_status;
5942         rpc_put_task(task);
5943         return 0;
5944 out:
5945         dprintk("<-- %s status=%d\n", __func__, status);
5946         return status;
5947 }
5948
5949 static void
5950 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5951 {
5952         struct nfs4_layoutget *lgp = calldata;
5953         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5954         struct nfs4_session *session = nfs4_get_session(server);
5955
5956         dprintk("--> %s\n", __func__);
5957         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5958          * right now covering the LAYOUTGET we are about to send.
5959          * However, that is not so catastrophic, and there seems
5960          * to be no way to prevent it completely.
5961          */
5962         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
5963                                 &lgp->res.seq_res, task))
5964                 return;
5965         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5966                                           NFS_I(lgp->args.inode)->layout,
5967                                           lgp->args.ctx->state)) {
5968                 rpc_exit(task, NFS4_OK);
5969         }
5970 }
5971
5972 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5973 {
5974         struct nfs4_layoutget *lgp = calldata;
5975         struct inode *inode = lgp->args.inode;
5976         struct nfs_server *server = NFS_SERVER(inode);
5977         struct pnfs_layout_hdr *lo;
5978         struct nfs4_state *state = NULL;
5979
5980         dprintk("--> %s\n", __func__);
5981
5982         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
5983                 goto out;
5984
5985         switch (task->tk_status) {
5986         case 0:
5987                 goto out;
5988         case -NFS4ERR_LAYOUTTRYLATER:
5989         case -NFS4ERR_RECALLCONFLICT:
5990                 task->tk_status = -NFS4ERR_DELAY;
5991                 break;
5992         case -NFS4ERR_EXPIRED:
5993         case -NFS4ERR_BAD_STATEID:
5994                 spin_lock(&inode->i_lock);
5995                 lo = NFS_I(inode)->layout;
5996                 if (!lo || list_empty(&lo->plh_segs)) {
5997                         spin_unlock(&inode->i_lock);
5998                         /* If the open stateid was bad, then recover it. */
5999                         state = lgp->args.ctx->state;
6000                 } else {
6001                         LIST_HEAD(head);
6002
6003                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6004                         spin_unlock(&inode->i_lock);
6005                         /* Mark the bad layout state as invalid, then
6006                          * retry using the open stateid. */
6007                         pnfs_free_lseg_list(&head);
6008                 }
6009         }
6010         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6011                 rpc_restart_call_prepare(task);
6012 out:
6013         dprintk("<-- %s\n", __func__);
6014 }
6015
6016 static size_t max_response_pages(struct nfs_server *server)
6017 {
6018         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6019         return nfs_page_array_len(0, max_resp_sz);
6020 }
6021
6022 static void nfs4_free_pages(struct page **pages, size_t size)
6023 {
6024         int i;
6025
6026         if (!pages)
6027                 return;
6028
6029         for (i = 0; i < size; i++) {
6030                 if (!pages[i])
6031                         break;
6032                 __free_page(pages[i]);
6033         }
6034         kfree(pages);
6035 }
6036
6037 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6038 {
6039         struct page **pages;
6040         int i;
6041
6042         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6043         if (!pages) {
6044                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6045                 return NULL;
6046         }
6047
6048         for (i = 0; i < size; i++) {
6049                 pages[i] = alloc_page(gfp_flags);
6050                 if (!pages[i]) {
6051                         dprintk("%s: failed to allocate page\n", __func__);
6052                         nfs4_free_pages(pages, size);
6053                         return NULL;
6054                 }
6055         }
6056
6057         return pages;
6058 }
6059
6060 static void nfs4_layoutget_release(void *calldata)
6061 {
6062         struct nfs4_layoutget *lgp = calldata;
6063         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6064         size_t max_pages = max_response_pages(server);
6065
6066         dprintk("--> %s\n", __func__);
6067         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6068         put_nfs_open_context(lgp->args.ctx);
6069         kfree(calldata);
6070         dprintk("<-- %s\n", __func__);
6071 }
6072
6073 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6074         .rpc_call_prepare = nfs4_layoutget_prepare,
6075         .rpc_call_done = nfs4_layoutget_done,
6076         .rpc_release = nfs4_layoutget_release,
6077 };
6078
6079 struct pnfs_layout_segment *
6080 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6081 {
6082         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6083         size_t max_pages = max_response_pages(server);
6084         struct rpc_task *task;
6085         struct rpc_message msg = {
6086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6087                 .rpc_argp = &lgp->args,
6088                 .rpc_resp = &lgp->res,
6089         };
6090         struct rpc_task_setup task_setup_data = {
6091                 .rpc_client = server->client,
6092                 .rpc_message = &msg,
6093                 .callback_ops = &nfs4_layoutget_call_ops,
6094                 .callback_data = lgp,
6095                 .flags = RPC_TASK_ASYNC,
6096         };
6097         struct pnfs_layout_segment *lseg = NULL;
6098         int status = 0;
6099
6100         dprintk("--> %s\n", __func__);
6101
6102         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6103         if (!lgp->args.layout.pages) {
6104                 nfs4_layoutget_release(lgp);
6105                 return ERR_PTR(-ENOMEM);
6106         }
6107         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6108
6109         lgp->res.layoutp = &lgp->args.layout;
6110         lgp->res.seq_res.sr_slot = NULL;
6111         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6112         task = rpc_run_task(&task_setup_data);
6113         if (IS_ERR(task))
6114                 return ERR_CAST(task);
6115         status = nfs4_wait_for_completion_rpc_task(task);
6116         if (status == 0)
6117                 status = task->tk_status;
6118         if (status == 0)
6119                 lseg = pnfs_layout_process(lgp);
6120         rpc_put_task(task);
6121         dprintk("<-- %s status=%d\n", __func__, status);
6122         if (status)
6123                 return ERR_PTR(status);
6124         return lseg;
6125 }
6126
6127 static void
6128 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6129 {
6130         struct nfs4_layoutreturn *lrp = calldata;
6131
6132         dprintk("--> %s\n", __func__);
6133         nfs41_setup_sequence(lrp->clp->cl_session,
6134                         &lrp->args.seq_args,
6135                         &lrp->res.seq_res,
6136                         task);
6137 }
6138
6139 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6140 {
6141         struct nfs4_layoutreturn *lrp = calldata;
6142         struct nfs_server *server;
6143
6144         dprintk("--> %s\n", __func__);
6145
6146         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6147                 return;
6148
6149         server = NFS_SERVER(lrp->args.inode);
6150         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6151                 rpc_restart_call_prepare(task);
6152                 return;
6153         }
6154         dprintk("<-- %s\n", __func__);
6155 }
6156
6157 static void nfs4_layoutreturn_release(void *calldata)
6158 {
6159         struct nfs4_layoutreturn *lrp = calldata;
6160         struct pnfs_layout_hdr *lo = lrp->args.layout;
6161
6162         dprintk("--> %s\n", __func__);
6163         spin_lock(&lo->plh_inode->i_lock);
6164         if (lrp->res.lrs_present)
6165                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6166         lo->plh_block_lgets--;
6167         spin_unlock(&lo->plh_inode->i_lock);
6168         pnfs_put_layout_hdr(lrp->args.layout);
6169         kfree(calldata);
6170         dprintk("<-- %s\n", __func__);
6171 }
6172
6173 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6174         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6175         .rpc_call_done = nfs4_layoutreturn_done,
6176         .rpc_release = nfs4_layoutreturn_release,
6177 };
6178
6179 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6180 {
6181         struct rpc_task *task;
6182         struct rpc_message msg = {
6183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6184                 .rpc_argp = &lrp->args,
6185                 .rpc_resp = &lrp->res,
6186         };
6187         struct rpc_task_setup task_setup_data = {
6188                 .rpc_client = lrp->clp->cl_rpcclient,
6189                 .rpc_message = &msg,
6190                 .callback_ops = &nfs4_layoutreturn_call_ops,
6191                 .callback_data = lrp,
6192         };
6193         int status;
6194
6195         dprintk("--> %s\n", __func__);
6196         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6197         task = rpc_run_task(&task_setup_data);
6198         if (IS_ERR(task))
6199                 return PTR_ERR(task);
6200         status = task->tk_status;
6201         dprintk("<-- %s status=%d\n", __func__, status);
6202         rpc_put_task(task);
6203         return status;
6204 }
6205
6206 /*
6207  * Retrieve the list of Data Server devices from the MDS.
6208  */
6209 static int _nfs4_getdevicelist(struct nfs_server *server,
6210                                     const struct nfs_fh *fh,
6211                                     struct pnfs_devicelist *devlist)
6212 {
6213         struct nfs4_getdevicelist_args args = {
6214                 .fh = fh,
6215                 .layoutclass = server->pnfs_curr_ld->id,
6216         };
6217         struct nfs4_getdevicelist_res res = {
6218                 .devlist = devlist,
6219         };
6220         struct rpc_message msg = {
6221                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6222                 .rpc_argp = &args,
6223                 .rpc_resp = &res,
6224         };
6225         int status;
6226
6227         dprintk("--> %s\n", __func__);
6228         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6229                                 &res.seq_res, 0);
6230         dprintk("<-- %s status=%d\n", __func__, status);
6231         return status;
6232 }
6233
6234 int nfs4_proc_getdevicelist(struct nfs_server *server,
6235                             const struct nfs_fh *fh,
6236                             struct pnfs_devicelist *devlist)
6237 {
6238         struct nfs4_exception exception = { };
6239         int err;
6240
6241         do {
6242                 err = nfs4_handle_exception(server,
6243                                 _nfs4_getdevicelist(server, fh, devlist),
6244                                 &exception);
6245         } while (exception.retry);
6246
6247         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6248                 err, devlist->num_devs);
6249
6250         return err;
6251 }
6252 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6253
6254 static int
6255 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6256 {
6257         struct nfs4_getdeviceinfo_args args = {
6258                 .pdev = pdev,
6259         };
6260         struct nfs4_getdeviceinfo_res res = {
6261                 .pdev = pdev,
6262         };
6263         struct rpc_message msg = {
6264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6265                 .rpc_argp = &args,
6266                 .rpc_resp = &res,
6267         };
6268         int status;
6269
6270         dprintk("--> %s\n", __func__);
6271         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6272         dprintk("<-- %s status=%d\n", __func__, status);
6273
6274         return status;
6275 }
6276
6277 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6278 {
6279         struct nfs4_exception exception = { };
6280         int err;
6281
6282         do {
6283                 err = nfs4_handle_exception(server,
6284                                         _nfs4_proc_getdeviceinfo(server, pdev),
6285                                         &exception);
6286         } while (exception.retry);
6287         return err;
6288 }
6289 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6290
6291 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6292 {
6293         struct nfs4_layoutcommit_data *data = calldata;
6294         struct nfs_server *server = NFS_SERVER(data->args.inode);
6295         struct nfs4_session *session = nfs4_get_session(server);
6296
6297         nfs41_setup_sequence(session,
6298                         &data->args.seq_args,
6299                         &data->res.seq_res,
6300                         task);
6301 }
6302
6303 static void
6304 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6305 {
6306         struct nfs4_layoutcommit_data *data = calldata;
6307         struct nfs_server *server = NFS_SERVER(data->args.inode);
6308
6309         if (!nfs41_sequence_done(task, &data->res.seq_res))
6310                 return;
6311
6312         switch (task->tk_status) { /* Just ignore these failures */
6313         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6314         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6315         case -NFS4ERR_BADLAYOUT:     /* no layout */
6316         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6317                 task->tk_status = 0;
6318                 break;
6319         case 0:
6320                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6321                                                    data->res.fattr);
6322                 break;
6323         default:
6324                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6325                         rpc_restart_call_prepare(task);
6326                         return;
6327                 }
6328         }
6329 }
6330
6331 static void nfs4_layoutcommit_release(void *calldata)
6332 {
6333         struct nfs4_layoutcommit_data *data = calldata;
6334         struct pnfs_layout_segment *lseg, *tmp;
6335         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6336
6337         pnfs_cleanup_layoutcommit(data);
6338         /* Matched by references in pnfs_set_layoutcommit */
6339         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6340                 list_del_init(&lseg->pls_lc_list);
6341                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6342                                        &lseg->pls_flags))
6343                         pnfs_put_lseg(lseg);
6344         }
6345
6346         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6347         smp_mb__after_clear_bit();
6348         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6349
6350         put_rpccred(data->cred);
6351         kfree(data);
6352 }
6353
6354 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6355         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6356         .rpc_call_done = nfs4_layoutcommit_done,
6357         .rpc_release = nfs4_layoutcommit_release,
6358 };
6359
6360 int
6361 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6362 {
6363         struct rpc_message msg = {
6364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6365                 .rpc_argp = &data->args,
6366                 .rpc_resp = &data->res,
6367                 .rpc_cred = data->cred,
6368         };
6369         struct rpc_task_setup task_setup_data = {
6370                 .task = &data->task,
6371                 .rpc_client = NFS_CLIENT(data->args.inode),
6372                 .rpc_message = &msg,
6373                 .callback_ops = &nfs4_layoutcommit_ops,
6374                 .callback_data = data,
6375                 .flags = RPC_TASK_ASYNC,
6376         };
6377         struct rpc_task *task;
6378         int status = 0;
6379
6380         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6381                 "lbw: %llu inode %lu\n",
6382                 data->task.tk_pid, sync,
6383                 data->args.lastbytewritten,
6384                 data->args.inode->i_ino);
6385
6386         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6387         task = rpc_run_task(&task_setup_data);
6388         if (IS_ERR(task))
6389                 return PTR_ERR(task);
6390         if (sync == false)
6391                 goto out;
6392         status = nfs4_wait_for_completion_rpc_task(task);
6393         if (status != 0)
6394                 goto out;
6395         status = task->tk_status;
6396 out:
6397         dprintk("%s: status %d\n", __func__, status);
6398         rpc_put_task(task);
6399         return status;
6400 }
6401
6402 static int
6403 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6404                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6405 {
6406         struct nfs41_secinfo_no_name_args args = {
6407                 .style = SECINFO_STYLE_CURRENT_FH,
6408         };
6409         struct nfs4_secinfo_res res = {
6410                 .flavors = flavors,
6411         };
6412         struct rpc_message msg = {
6413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6414                 .rpc_argp = &args,
6415                 .rpc_resp = &res,
6416         };
6417         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6418 }
6419
6420 static int
6421 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6422                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6423 {
6424         struct nfs4_exception exception = { };
6425         int err;
6426         do {
6427                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6428                 switch (err) {
6429                 case 0:
6430                 case -NFS4ERR_WRONGSEC:
6431                 case -NFS4ERR_NOTSUPP:
6432                         goto out;
6433                 default:
6434                         err = nfs4_handle_exception(server, err, &exception);
6435                 }
6436         } while (exception.retry);
6437 out:
6438         return err;
6439 }
6440
6441 static int
6442 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6443                     struct nfs_fsinfo *info)
6444 {
6445         int err;
6446         struct page *page;
6447         rpc_authflavor_t flavor;
6448         struct nfs4_secinfo_flavors *flavors;
6449
6450         page = alloc_page(GFP_KERNEL);
6451         if (!page) {
6452                 err = -ENOMEM;
6453                 goto out;
6454         }
6455
6456         flavors = page_address(page);
6457         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6458
6459         /*
6460          * Fall back on "guess and check" method if
6461          * the server doesn't support SECINFO_NO_NAME
6462          */
6463         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6464                 err = nfs4_find_root_sec(server, fhandle, info);
6465                 goto out_freepage;
6466         }
6467         if (err)
6468                 goto out_freepage;
6469
6470         flavor = nfs_find_best_sec(flavors);
6471         if (err == 0)
6472                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6473
6474 out_freepage:
6475         put_page(page);
6476         if (err == -EACCES)
6477                 return -EPERM;
6478 out:
6479         return err;
6480 }
6481
6482 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6483 {
6484         int status;
6485         struct nfs41_test_stateid_args args = {
6486                 .stateid = stateid,
6487         };
6488         struct nfs41_test_stateid_res res;
6489         struct rpc_message msg = {
6490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6491                 .rpc_argp = &args,
6492                 .rpc_resp = &res,
6493         };
6494
6495         dprintk("NFS call  test_stateid %p\n", stateid);
6496         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6497         nfs4_set_sequence_privileged(&args.seq_args);
6498         status = nfs4_call_sync_sequence(server->client, server, &msg,
6499                         &args.seq_args, &res.seq_res);
6500         if (status != NFS_OK) {
6501                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6502                 return status;
6503         }
6504         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6505         return -res.status;
6506 }
6507
6508 /**
6509  * nfs41_test_stateid - perform a TEST_STATEID operation
6510  *
6511  * @server: server / transport on which to perform the operation
6512  * @stateid: state ID to test
6513  *
6514  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6515  * Otherwise a negative NFS4ERR value is returned if the operation
6516  * failed or the state ID is not currently valid.
6517  */
6518 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6519 {
6520         struct nfs4_exception exception = { };
6521         int err;
6522         do {
6523                 err = _nfs41_test_stateid(server, stateid);
6524                 if (err != -NFS4ERR_DELAY)
6525                         break;
6526                 nfs4_handle_exception(server, err, &exception);
6527         } while (exception.retry);
6528         return err;
6529 }
6530
6531 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6532 {
6533         struct nfs41_free_stateid_args args = {
6534                 .stateid = stateid,
6535         };
6536         struct nfs41_free_stateid_res res;
6537         struct rpc_message msg = {
6538                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6539                 .rpc_argp = &args,
6540                 .rpc_resp = &res,
6541         };
6542         int status;
6543
6544         dprintk("NFS call  free_stateid %p\n", stateid);
6545         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6546         nfs4_set_sequence_privileged(&args.seq_args);
6547         status = nfs4_call_sync_sequence(server->client, server, &msg,
6548                         &args.seq_args, &res.seq_res);
6549         dprintk("NFS reply free_stateid: %d\n", status);
6550         return status;
6551 }
6552
6553 /**
6554  * nfs41_free_stateid - perform a FREE_STATEID operation
6555  *
6556  * @server: server / transport on which to perform the operation
6557  * @stateid: state ID to release
6558  *
6559  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6560  * negative NFS4ERR value is returned.
6561  */
6562 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6563 {
6564         struct nfs4_exception exception = { };
6565         int err;
6566         do {
6567                 err = _nfs4_free_stateid(server, stateid);
6568                 if (err != -NFS4ERR_DELAY)
6569                         break;
6570                 nfs4_handle_exception(server, err, &exception);
6571         } while (exception.retry);
6572         return err;
6573 }
6574
6575 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6576                 const nfs4_stateid *s2)
6577 {
6578         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6579                 return false;
6580
6581         if (s1->seqid == s2->seqid)
6582                 return true;
6583         if (s1->seqid == 0 || s2->seqid == 0)
6584                 return true;
6585
6586         return false;
6587 }
6588
6589 #endif /* CONFIG_NFS_V4_1 */
6590
6591 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6592                 const nfs4_stateid *s2)
6593 {
6594         return nfs4_stateid_match(s1, s2);
6595 }
6596
6597
6598 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6599         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6600         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6601         .recover_open   = nfs4_open_reclaim,
6602         .recover_lock   = nfs4_lock_reclaim,
6603         .establish_clid = nfs4_init_clientid,
6604         .get_clid_cred  = nfs4_get_setclientid_cred,
6605         .detect_trunking = nfs40_discover_server_trunking,
6606 };
6607
6608 #if defined(CONFIG_NFS_V4_1)
6609 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6610         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6611         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6612         .recover_open   = nfs4_open_reclaim,
6613         .recover_lock   = nfs4_lock_reclaim,
6614         .establish_clid = nfs41_init_clientid,
6615         .get_clid_cred  = nfs4_get_exchange_id_cred,
6616         .reclaim_complete = nfs41_proc_reclaim_complete,
6617         .detect_trunking = nfs41_discover_server_trunking,
6618 };
6619 #endif /* CONFIG_NFS_V4_1 */
6620
6621 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6622         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6623         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6624         .recover_open   = nfs4_open_expired,
6625         .recover_lock   = nfs4_lock_expired,
6626         .establish_clid = nfs4_init_clientid,
6627         .get_clid_cred  = nfs4_get_setclientid_cred,
6628 };
6629
6630 #if defined(CONFIG_NFS_V4_1)
6631 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6632         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6633         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6634         .recover_open   = nfs41_open_expired,
6635         .recover_lock   = nfs41_lock_expired,
6636         .establish_clid = nfs41_init_clientid,
6637         .get_clid_cred  = nfs4_get_exchange_id_cred,
6638 };
6639 #endif /* CONFIG_NFS_V4_1 */
6640
6641 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6642         .sched_state_renewal = nfs4_proc_async_renew,
6643         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6644         .renew_lease = nfs4_proc_renew,
6645 };
6646
6647 #if defined(CONFIG_NFS_V4_1)
6648 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6649         .sched_state_renewal = nfs41_proc_async_sequence,
6650         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6651         .renew_lease = nfs4_proc_sequence,
6652 };
6653 #endif
6654
6655 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6656         .minor_version = 0,
6657         .call_sync = _nfs4_call_sync,
6658         .match_stateid = nfs4_match_stateid,
6659         .find_root_sec = nfs4_find_root_sec,
6660         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6661         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6662         .state_renewal_ops = &nfs40_state_renewal_ops,
6663 };
6664
6665 #if defined(CONFIG_NFS_V4_1)
6666 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6667         .minor_version = 1,
6668         .call_sync = nfs4_call_sync_sequence,
6669         .match_stateid = nfs41_match_stateid,
6670         .find_root_sec = nfs41_find_root_sec,
6671         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6672         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6673         .state_renewal_ops = &nfs41_state_renewal_ops,
6674 };
6675 #endif
6676
6677 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6678         [0] = &nfs_v4_0_minor_ops,
6679 #if defined(CONFIG_NFS_V4_1)
6680         [1] = &nfs_v4_1_minor_ops,
6681 #endif
6682 };
6683
6684 const struct inode_operations nfs4_dir_inode_operations = {
6685         .create         = nfs_create,
6686         .lookup         = nfs_lookup,
6687         .atomic_open    = nfs_atomic_open,
6688         .link           = nfs_link,
6689         .unlink         = nfs_unlink,
6690         .symlink        = nfs_symlink,
6691         .mkdir          = nfs_mkdir,
6692         .rmdir          = nfs_rmdir,
6693         .mknod          = nfs_mknod,
6694         .rename         = nfs_rename,
6695         .permission     = nfs_permission,
6696         .getattr        = nfs_getattr,
6697         .setattr        = nfs_setattr,
6698         .getxattr       = generic_getxattr,
6699         .setxattr       = generic_setxattr,
6700         .listxattr      = generic_listxattr,
6701         .removexattr    = generic_removexattr,
6702 };
6703
6704 static const struct inode_operations nfs4_file_inode_operations = {
6705         .permission     = nfs_permission,
6706         .getattr        = nfs_getattr,
6707         .setattr        = nfs_setattr,
6708         .getxattr       = generic_getxattr,
6709         .setxattr       = generic_setxattr,
6710         .listxattr      = generic_listxattr,
6711         .removexattr    = generic_removexattr,
6712 };
6713
6714 const struct nfs_rpc_ops nfs_v4_clientops = {
6715         .version        = 4,                    /* protocol version */
6716         .dentry_ops     = &nfs4_dentry_operations,
6717         .dir_inode_ops  = &nfs4_dir_inode_operations,
6718         .file_inode_ops = &nfs4_file_inode_operations,
6719         .file_ops       = &nfs4_file_operations,
6720         .getroot        = nfs4_proc_get_root,
6721         .submount       = nfs4_submount,
6722         .try_mount      = nfs4_try_mount,
6723         .getattr        = nfs4_proc_getattr,
6724         .setattr        = nfs4_proc_setattr,
6725         .lookup         = nfs4_proc_lookup,
6726         .access         = nfs4_proc_access,
6727         .readlink       = nfs4_proc_readlink,
6728         .create         = nfs4_proc_create,
6729         .remove         = nfs4_proc_remove,
6730         .unlink_setup   = nfs4_proc_unlink_setup,
6731         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6732         .unlink_done    = nfs4_proc_unlink_done,
6733         .rename         = nfs4_proc_rename,
6734         .rename_setup   = nfs4_proc_rename_setup,
6735         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6736         .rename_done    = nfs4_proc_rename_done,
6737         .link           = nfs4_proc_link,
6738         .symlink        = nfs4_proc_symlink,
6739         .mkdir          = nfs4_proc_mkdir,
6740         .rmdir          = nfs4_proc_remove,
6741         .readdir        = nfs4_proc_readdir,
6742         .mknod          = nfs4_proc_mknod,
6743         .statfs         = nfs4_proc_statfs,
6744         .fsinfo         = nfs4_proc_fsinfo,
6745         .pathconf       = nfs4_proc_pathconf,
6746         .set_capabilities = nfs4_server_capabilities,
6747         .decode_dirent  = nfs4_decode_dirent,
6748         .read_setup     = nfs4_proc_read_setup,
6749         .read_pageio_init = pnfs_pageio_init_read,
6750         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6751         .read_done      = nfs4_read_done,
6752         .write_setup    = nfs4_proc_write_setup,
6753         .write_pageio_init = pnfs_pageio_init_write,
6754         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6755         .write_done     = nfs4_write_done,
6756         .commit_setup   = nfs4_proc_commit_setup,
6757         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6758         .commit_done    = nfs4_commit_done,
6759         .lock           = nfs4_proc_lock,
6760         .clear_acl_cache = nfs4_zap_acl_attr,
6761         .close_context  = nfs4_close_context,
6762         .open_context   = nfs4_atomic_open,
6763         .have_delegation = nfs4_have_delegation,
6764         .return_delegation = nfs4_inode_return_delegation,
6765         .alloc_client   = nfs4_alloc_client,
6766         .init_client    = nfs4_init_client,
6767         .free_client    = nfs4_free_client,
6768         .create_server  = nfs4_create_server,
6769         .clone_server   = nfs_clone_server,
6770 };
6771
6772 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6773         .prefix = XATTR_NAME_NFSV4_ACL,
6774         .list   = nfs4_xattr_list_nfs4_acl,
6775         .get    = nfs4_xattr_get_nfs4_acl,
6776         .set    = nfs4_xattr_set_nfs4_acl,
6777 };
6778
6779 const struct xattr_handler *nfs4_xattr_handlers[] = {
6780         &nfs4_xattr_nfs4_acl_handler,
6781         NULL
6782 };
6783
6784 /*
6785  * Local variables:
6786  *  c-basic-offset: 8
6787  * End:
6788  */