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/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58 #include "pnfs.h"
  59
  60 #define NFSDBG_FACILITY         NFSDBG_PROC
  61
  62 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  63 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  64
  65 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  66
  67 struct nfs4_opendata;
  68 static int _nfs4_proc_open(struct nfs4_opendata *data);
  69 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  70 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  71 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  72 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  74 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  75                             struct nfs_fattr *fattr, struct iattr *sattr,
  76                             struct nfs4_state *state);
  77
  78 /* Prevent leaks of NFSv4 errors into userland */
  79 static int nfs4_map_errors(int err)
  80 {
  81         if (err >= -1000)
  82                 return err;
  83         switch (err) {
  84         case -NFS4ERR_RESOURCE:
  85                 return -EREMOTEIO;
  86         default:
  87                 dprintk("%s could not handle NFSv4 error %d\n",
  88                                 __func__, -err);
  89                 break;
  90         }
  91         return -EIO;
  92 }
  93
  94 /*
  95  * This is our standard bitmap for GETATTR requests.
  96  */
  97 const u32 nfs4_fattr_bitmap[2] = {
  98         FATTR4_WORD0_TYPE
  99         | FATTR4_WORD0_CHANGE
 100         | FATTR4_WORD0_SIZE
 101         | FATTR4_WORD0_FSID
 102         | FATTR4_WORD0_FILEID,
 103         FATTR4_WORD1_MODE
 104         | FATTR4_WORD1_NUMLINKS
 105         | FATTR4_WORD1_OWNER
 106         | FATTR4_WORD1_OWNER_GROUP
 107         | FATTR4_WORD1_RAWDEV
 108         | FATTR4_WORD1_SPACE_USED
 109         | FATTR4_WORD1_TIME_ACCESS
 110         | FATTR4_WORD1_TIME_METADATA
 111         | FATTR4_WORD1_TIME_MODIFY
 112 };
 113
 114 const u32 nfs4_statfs_bitmap[2] = {
 115         FATTR4_WORD0_FILES_AVAIL
 116         | FATTR4_WORD0_FILES_FREE
 117         | FATTR4_WORD0_FILES_TOTAL,
 118         FATTR4_WORD1_SPACE_AVAIL
 119         | FATTR4_WORD1_SPACE_FREE
 120         | FATTR4_WORD1_SPACE_TOTAL
 121 };
 122
 123 const u32 nfs4_pathconf_bitmap[2] = {
 124         FATTR4_WORD0_MAXLINK
 125         | FATTR4_WORD0_MAXNAME,
 126         0
 127 };
 128
 129 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 130                         | FATTR4_WORD0_MAXREAD
 131                         | FATTR4_WORD0_MAXWRITE
 132                         | FATTR4_WORD0_LEASE_TIME,
 133                         FATTR4_WORD1_TIME_DELTA
 134                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 135 };
 136
 137 const u32 nfs4_fs_locations_bitmap[2] = {
 138         FATTR4_WORD0_TYPE
 139         | FATTR4_WORD0_CHANGE
 140         | FATTR4_WORD0_SIZE
 141         | FATTR4_WORD0_FSID
 142         | FATTR4_WORD0_FILEID
 143         | FATTR4_WORD0_FS_LOCATIONS,
 144         FATTR4_WORD1_MODE
 145         | FATTR4_WORD1_NUMLINKS
 146         | FATTR4_WORD1_OWNER
 147         | FATTR4_WORD1_OWNER_GROUP
 148         | FATTR4_WORD1_RAWDEV
 149         | FATTR4_WORD1_SPACE_USED
 150         | FATTR4_WORD1_TIME_ACCESS
 151         | FATTR4_WORD1_TIME_METADATA
 152         | FATTR4_WORD1_TIME_MODIFY
 153         | FATTR4_WORD1_MOUNTED_ON_FILEID
 154 };
 155
 156 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 157                 struct nfs4_readdir_arg *readdir)
 158 {
 159         __be32 *start, *p;
 160
 161         BUG_ON(readdir->count < 80);
 162         if (cookie > 2) {
 163                 readdir->cookie = cookie;
 164                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 165                 return;
 166         }
 167
 168         readdir->cookie = 0;
 169         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 170         if (cookie == 2)
 171                 return;
 172
 173         /*
 174          * NFSv4 servers do not return entries for '.' and '..'
 175          * Therefore, we fake these entries here.  We let '.'
 176          * have cookie 0 and '..' have cookie 1.  Note that
 177          * when talking to the server, we always send cookie 0
 178          * instead of 1 or 2.
 179          */
 180         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 181
 182         if (cookie == 0) {
 183                 *p++ = xdr_one;                                  /* next */
 184                 *p++ = xdr_zero;                   /* cookie, first word */
 185                 *p++ = xdr_one;                   /* cookie, second word */
 186                 *p++ = xdr_one;                             /* entry len */
 187                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 188                 p++;
 189                 *p++ = xdr_one;                         /* bitmap length */
 190                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 191                 *p++ = htonl(8);              /* attribute buffer length */
 192                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 193         }
 194
 195         *p++ = xdr_one;                                  /* next */
 196         *p++ = xdr_zero;                   /* cookie, first word */
 197         *p++ = xdr_two;                   /* cookie, second word */
 198         *p++ = xdr_two;                             /* entry len */
 199         memcpy(p, "..\0\0", 4);                         /* entry */
 200         p++;
 201         *p++ = xdr_one;                         /* bitmap length */
 202         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 203         *p++ = htonl(8);              /* attribute buffer length */
 204         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 205
 206         readdir->pgbase = (char *)p - (char *)start;
 207         readdir->count -= readdir->pgbase;
 208         kunmap_atomic(start, KM_USER0);
 209 }
 210
 211 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 212 {
 213         int res;
 214
 215         might_sleep();
 216
 217         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 218                         nfs_wait_bit_killable, TASK_KILLABLE);
 219         return res;
 220 }
 221
 222 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 223 {
 224         int res = 0;
 225
 226         might_sleep();
 227
 228         if (*timeout <= 0)
 229                 *timeout = NFS4_POLL_RETRY_MIN;
 230         if (*timeout > NFS4_POLL_RETRY_MAX)
 231                 *timeout = NFS4_POLL_RETRY_MAX;
 232         schedule_timeout_killable(*timeout);
 233         if (fatal_signal_pending(current))
 234                 res = -ERESTARTSYS;
 235         *timeout <<= 1;
 236         return res;
 237 }
 238
 239 /* This is the error handling routine for processes that are allowed
 240  * to sleep.
 241  */
 242 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 243 {
 244         struct nfs_client *clp = server->nfs_client;
 245         struct nfs4_state *state = exception->state;
 246         int ret = errorcode;
 247
 248         exception->retry = 0;
 249         switch(errorcode) {
 250                 case 0:
 251                         return 0;
 252                 case -NFS4ERR_ADMIN_REVOKED:
 253                 case -NFS4ERR_BAD_STATEID:
 254                 case -NFS4ERR_OPENMODE:
 255                         if (state == NULL)
 256                                 break;
 257                         nfs4_state_mark_reclaim_nograce(clp, state);
 258                         goto do_state_recovery;
 259                 case -NFS4ERR_STALE_STATEID:
 260                 case -NFS4ERR_STALE_CLIENTID:
 261                 case -NFS4ERR_EXPIRED:
 262                         goto do_state_recovery;
 263 #if defined(CONFIG_NFS_V4_1)
 264                 case -NFS4ERR_BADSESSION:
 265                 case -NFS4ERR_BADSLOT:
 266                 case -NFS4ERR_BAD_HIGH_SLOT:
 267                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 268                 case -NFS4ERR_DEADSESSION:
 269                 case -NFS4ERR_SEQ_FALSE_RETRY:
 270                 case -NFS4ERR_SEQ_MISORDERED:
 271                         dprintk("%s ERROR: %d Reset session\n", __func__,
 272                                 errorcode);
 273                         nfs4_schedule_state_recovery(clp);
 274                         exception->retry = 1;
 275                         break;
 276 #endif /* defined(CONFIG_NFS_V4_1) */
 277                 case -NFS4ERR_FILE_OPEN:
 278                         if (exception->timeout > HZ) {
 279                                 /* We have retried a decent amount, time to
 280                                  * fail
 281                                  */
 282                                 ret = -EBUSY;
 283                                 break;
 284                         }
 285                 case -NFS4ERR_GRACE:
 286                 case -NFS4ERR_DELAY:
 287                 case -EKEYEXPIRED:
 288                         ret = nfs4_delay(server->client, &exception->timeout);
 289                         if (ret != 0)
 290                                 break;
 291                 case -NFS4ERR_OLD_STATEID:
 292                         exception->retry = 1;
 293         }
 294         /* We failed to handle the error */
 295         return nfs4_map_errors(ret);
 296 do_state_recovery:
 297         nfs4_schedule_state_recovery(clp);
 298         ret = nfs4_wait_clnt_recover(clp);
 299         if (ret == 0)
 300                 exception->retry = 1;
 301         return ret;
 302 }
 303
 304
 305 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 306 {
 307         spin_lock(&clp->cl_lock);
 308         if (time_before(clp->cl_last_renewal,timestamp))
 309                 clp->cl_last_renewal = timestamp;
 310         spin_unlock(&clp->cl_lock);
 311 }
 312
 313 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 314 {
 315         do_renew_lease(server->nfs_client, timestamp);
 316 }
 317
 318 #if defined(CONFIG_NFS_V4_1)
 319
 320 /*
 321  * nfs4_free_slot - free a slot and efficiently update slot table.
 322  *
 323  * freeing a slot is trivially done by clearing its respective bit
 324  * in the bitmap.
 325  * If the freed slotid equals highest_used_slotid we want to update it
 326  * so that the server would be able to size down the slot table if needed,
 327  * otherwise we know that the highest_used_slotid is still in use.
 328  * When updating highest_used_slotid there may be "holes" in the bitmap
 329  * so we need to scan down from highest_used_slotid to 0 looking for the now
 330  * highest slotid in use.
 331  * If none found, highest_used_slotid is set to -1.
 332  *
 333  * Must be called while holding tbl->slot_tbl_lock
 334  */
 335 static void
 336 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 337 {
 338         int free_slotid = free_slot - tbl->slots;
 339         int slotid = free_slotid;
 340
 341         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 342         /* clear used bit in bitmap */
 343         __clear_bit(slotid, tbl->used_slots);
 344
 345         /* update highest_used_slotid when it is freed */
 346         if (slotid == tbl->highest_used_slotid) {
 347                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 348                 if (slotid < tbl->max_slots)
 349                         tbl->highest_used_slotid = slotid;
 350                 else
 351                         tbl->highest_used_slotid = -1;
 352         }
 353         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 354                 free_slotid, tbl->highest_used_slotid);
 355 }
 356
 357 /*
 358  * Signal state manager thread if session is drained
 359  */
 360 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 361 {
 362         struct rpc_task *task;
 363
 364         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 365                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 366                 if (task)
 367                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 368                 return;
 369         }
 370
 371         if (ses->fc_slot_table.highest_used_slotid != -1)
 372                 return;
 373
 374         dprintk("%s COMPLETE: Session Drained\n", __func__);
 375         complete(&ses->complete);
 376 }
 377
 378 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 379 {
 380         struct nfs4_slot_table *tbl;
 381
 382         tbl = &res->sr_session->fc_slot_table;
 383         if (!res->sr_slot) {
 384                 /* just wake up the next guy waiting since
 385                  * we may have not consumed a slot after all */
 386                 dprintk("%s: No slot\n", __func__);
 387                 return;
 388         }
 389
 390         spin_lock(&tbl->slot_tbl_lock);
 391         nfs4_free_slot(tbl, res->sr_slot);
 392         nfs41_check_drain_session_complete(res->sr_session);
 393         spin_unlock(&tbl->slot_tbl_lock);
 394         res->sr_slot = NULL;
 395 }
 396
 397 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 398 {
 399         unsigned long timestamp;
 400         struct nfs_client *clp;
 401
 402         /*
 403          * sr_status remains 1 if an RPC level error occurred. The server
 404          * may or may not have processed the sequence operation..
 405          * Proceed as if the server received and processed the sequence
 406          * operation.
 407          */
 408         if (res->sr_status == 1)
 409                 res->sr_status = NFS_OK;
 410
 411         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 412         if (!res->sr_slot)
 413                 goto out;
 414
 415         /* Check the SEQUENCE operation status */
 416         switch (res->sr_status) {
 417         case 0:
 418                 /* Update the slot's sequence and clientid lease timer */
 419                 ++res->sr_slot->seq_nr;
 420                 timestamp = res->sr_renewal_time;
 421                 clp = res->sr_session->clp;
 422                 do_renew_lease(clp, timestamp);
 423                 /* Check sequence flags */
 424                 if (atomic_read(&clp->cl_count) > 1)
 425                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 426                 break;
 427         case -NFS4ERR_DELAY:
 428                 /* The server detected a resend of the RPC call and
 429                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 430                  * of RFC5661.
 431                  */
 432                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 433                         __func__,
 434                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 435                         res->sr_slot->seq_nr);
 436                 goto out_retry;
 437         default:
 438                 /* Just update the slot sequence no. */
 439                 ++res->sr_slot->seq_nr;
 440         }
 441 out:
 442         /* The session may be reset by one of the error handlers. */
 443         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 444         nfs41_sequence_free_slot(res);
 445         return 1;
 446 out_retry:
 447         if (!rpc_restart_call(task))
 448                 goto out;
 449         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 450         return 0;
 451 }
 452
 453 static int nfs4_sequence_done(struct rpc_task *task,
 454                                struct nfs4_sequence_res *res)
 455 {
 456         if (res->sr_session == NULL)
 457                 return 1;
 458         return nfs41_sequence_done(task, res);
 459 }
 460
 461 /*
 462  * nfs4_find_slot - efficiently look for a free slot
 463  *
 464  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 465  * If found, we mark the slot as used, update the highest_used_slotid,
 466  * and respectively set up the sequence operation args.
 467  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 468  *
 469  * Note: must be called with under the slot_tbl_lock.
 470  */
 471 static u8
 472 nfs4_find_slot(struct nfs4_slot_table *tbl)
 473 {
 474         int slotid;
 475         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 476         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 477
 478         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 479                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 480                 tbl->max_slots);
 481         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 482         if (slotid >= tbl->max_slots)
 483                 goto out;
 484         __set_bit(slotid, tbl->used_slots);
 485         if (slotid > tbl->highest_used_slotid)
 486                 tbl->highest_used_slotid = slotid;
 487         ret_id = slotid;
 488 out:
 489         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 490                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 491         return ret_id;
 492 }
 493
 494 static int nfs41_setup_sequence(struct nfs4_session *session,
 495                                 struct nfs4_sequence_args *args,
 496                                 struct nfs4_sequence_res *res,
 497                                 int cache_reply,
 498                                 struct rpc_task *task)
 499 {
 500         struct nfs4_slot *slot;
 501         struct nfs4_slot_table *tbl;
 502         u8 slotid;
 503
 504         dprintk("--> %s\n", __func__);
 505         /* slot already allocated? */
 506         if (res->sr_slot != NULL)
 507                 return 0;
 508
 509         tbl = &session->fc_slot_table;
 510
 511         spin_lock(&tbl->slot_tbl_lock);
 512         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 513             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 514                 /*
 515                  * The state manager will wait until the slot table is empty.
 516                  * Schedule the reset thread
 517                  */
 518                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 519                 spin_unlock(&tbl->slot_tbl_lock);
 520                 dprintk("%s Schedule Session Reset\n", __func__);
 521                 return -EAGAIN;
 522         }
 523
 524         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 525             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 526                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 527                 spin_unlock(&tbl->slot_tbl_lock);
 528                 dprintk("%s enforce FIFO order\n", __func__);
 529                 return -EAGAIN;
 530         }
 531
 532         slotid = nfs4_find_slot(tbl);
 533         if (slotid == NFS4_MAX_SLOT_TABLE) {
 534                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 535                 spin_unlock(&tbl->slot_tbl_lock);
 536                 dprintk("<-- %s: no free slots\n", __func__);
 537                 return -EAGAIN;
 538         }
 539         spin_unlock(&tbl->slot_tbl_lock);
 540
 541         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 542         slot = tbl->slots + slotid;
 543         args->sa_session = session;
 544         args->sa_slotid = slotid;
 545         args->sa_cache_this = cache_reply;
 546
 547         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 548
 549         res->sr_session = session;
 550         res->sr_slot = slot;
 551         res->sr_renewal_time = jiffies;
 552         res->sr_status_flags = 0;
 553         /*
 554          * sr_status is only set in decode_sequence, and so will remain
 555          * set to 1 if an rpc level failure occurs.
 556          */
 557         res->sr_status = 1;
 558         return 0;
 559 }
 560
 561 int nfs4_setup_sequence(const struct nfs_server *server,
 562                         struct nfs4_sequence_args *args,
 563                         struct nfs4_sequence_res *res,
 564                         int cache_reply,
 565                         struct rpc_task *task)
 566 {
 567         struct nfs4_session *session = nfs4_get_session(server);
 568         int ret = 0;
 569
 570         if (session == NULL) {
 571                 args->sa_session = NULL;
 572                 res->sr_session = NULL;
 573                 goto out;
 574         }
 575
 576         dprintk("--> %s clp %p session %p sr_slot %td\n",
 577                 __func__, session->clp, session, res->sr_slot ?
 578                         res->sr_slot - session->fc_slot_table.slots : -1);
 579
 580         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 581                                    task);
 582 out:
 583         dprintk("<-- %s status=%d\n", __func__, ret);
 584         return ret;
 585 }
 586
 587 struct nfs41_call_sync_data {
 588         const struct nfs_server *seq_server;
 589         struct nfs4_sequence_args *seq_args;
 590         struct nfs4_sequence_res *seq_res;
 591         int cache_reply;
 592 };
 593
 594 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 595 {
 596         struct nfs41_call_sync_data *data = calldata;
 597
 598         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 599
 600         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 601                                 data->seq_res, data->cache_reply, task))
 602                 return;
 603         rpc_call_start(task);
 604 }
 605
 606 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 607 {
 608         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 609         nfs41_call_sync_prepare(task, calldata);
 610 }
 611
 612 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 613 {
 614         struct nfs41_call_sync_data *data = calldata;
 615
 616         nfs41_sequence_done(task, data->seq_res);
 617 }
 618
 619 struct rpc_call_ops nfs41_call_sync_ops = {
 620         .rpc_call_prepare = nfs41_call_sync_prepare,
 621         .rpc_call_done = nfs41_call_sync_done,
 622 };
 623
 624 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 625         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 626         .rpc_call_done = nfs41_call_sync_done,
 627 };
 628
 629 static int nfs4_call_sync_sequence(struct nfs_server *server,
 630                                    struct rpc_message *msg,
 631                                    struct nfs4_sequence_args *args,
 632                                    struct nfs4_sequence_res *res,
 633                                    int cache_reply,
 634                                    int privileged)
 635 {
 636         int ret;
 637         struct rpc_task *task;
 638         struct nfs41_call_sync_data data = {
 639                 .seq_server = server,
 640                 .seq_args = args,
 641                 .seq_res = res,
 642                 .cache_reply = cache_reply,
 643         };
 644         struct rpc_task_setup task_setup = {
 645                 .rpc_client = server->client,
 646                 .rpc_message = msg,
 647                 .callback_ops = &nfs41_call_sync_ops,
 648                 .callback_data = &data
 649         };
 650
 651         res->sr_slot = NULL;
 652         if (privileged)
 653                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 654         task = rpc_run_task(&task_setup);
 655         if (IS_ERR(task))
 656                 ret = PTR_ERR(task);
 657         else {
 658                 ret = task->tk_status;
 659                 rpc_put_task(task);
 660         }
 661         return ret;
 662 }
 663
 664 int _nfs4_call_sync_session(struct nfs_server *server,
 665                             struct rpc_message *msg,
 666                             struct nfs4_sequence_args *args,
 667                             struct nfs4_sequence_res *res,
 668                             int cache_reply)
 669 {
 670         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 671 }
 672
 673 #else
 674 static int nfs4_sequence_done(struct rpc_task *task,
 675                                struct nfs4_sequence_res *res)
 676 {
 677         return 1;
 678 }
 679 #endif /* CONFIG_NFS_V4_1 */
 680
 681 int _nfs4_call_sync(struct nfs_server *server,
 682                     struct rpc_message *msg,
 683                     struct nfs4_sequence_args *args,
 684                     struct nfs4_sequence_res *res,
 685                     int cache_reply)
 686 {
 687         args->sa_session = res->sr_session = NULL;
 688         return rpc_call_sync(server->client, msg, 0);
 689 }
 690
 691 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 692         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 693                         &(res)->seq_res, (cache_reply))
 694
 695 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 696 {
 697         struct nfs_inode *nfsi = NFS_I(dir);
 698
 699         spin_lock(&dir->i_lock);
 700         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 701         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 702                 nfs_force_lookup_revalidate(dir);
 703         nfsi->change_attr = cinfo->after;
 704         spin_unlock(&dir->i_lock);
 705 }
 706
 707 struct nfs4_opendata {
 708         struct kref kref;
 709         struct nfs_openargs o_arg;
 710         struct nfs_openres o_res;
 711         struct nfs_open_confirmargs c_arg;
 712         struct nfs_open_confirmres c_res;
 713         struct nfs_fattr f_attr;
 714         struct nfs_fattr dir_attr;
 715         struct path path;
 716         struct dentry *dir;
 717         struct nfs4_state_owner *owner;
 718         struct nfs4_state *state;
 719         struct iattr attrs;
 720         unsigned long timestamp;
 721         unsigned int rpc_done : 1;
 722         int rpc_status;
 723         int cancelled;
 724 };
 725
 726
 727 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 728 {
 729         p->o_res.f_attr = &p->f_attr;
 730         p->o_res.dir_attr = &p->dir_attr;
 731         p->o_res.seqid = p->o_arg.seqid;
 732         p->c_res.seqid = p->c_arg.seqid;
 733         p->o_res.server = p->o_arg.server;
 734         nfs_fattr_init(&p->f_attr);
 735         nfs_fattr_init(&p->dir_attr);
 736 }
 737
 738 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 739                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 740                 const struct iattr *attrs,
 741                 gfp_t gfp_mask)
 742 {
 743         struct dentry *parent = dget_parent(path->dentry);
 744         struct inode *dir = parent->d_inode;
 745         struct nfs_server *server = NFS_SERVER(dir);
 746         struct nfs4_opendata *p;
 747
 748         p = kzalloc(sizeof(*p), gfp_mask);
 749         if (p == NULL)
 750                 goto err;
 751         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 752         if (p->o_arg.seqid == NULL)
 753                 goto err_free;
 754         path_get(path);
 755         p->path = *path;
 756         p->dir = parent;
 757         p->owner = sp;
 758         atomic_inc(&sp->so_count);
 759         p->o_arg.fh = NFS_FH(dir);
 760         p->o_arg.open_flags = flags;
 761         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 762         p->o_arg.clientid = server->nfs_client->cl_clientid;
 763         p->o_arg.id = sp->so_owner_id.id;
 764         p->o_arg.name = &p->path.dentry->d_name;
 765         p->o_arg.server = server;
 766         p->o_arg.bitmask = server->attr_bitmask;
 767         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 768         if (flags & O_CREAT) {
 769                 u32 *s;
 770
 771                 p->o_arg.u.attrs = &p->attrs;
 772                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 773                 s = (u32 *) p->o_arg.u.verifier.data;
 774                 s[0] = jiffies;
 775                 s[1] = current->pid;
 776         }
 777         p->c_arg.fh = &p->o_res.fh;
 778         p->c_arg.stateid = &p->o_res.stateid;
 779         p->c_arg.seqid = p->o_arg.seqid;
 780         nfs4_init_opendata_res(p);
 781         kref_init(&p->kref);
 782         return p;
 783 err_free:
 784         kfree(p);
 785 err:
 786         dput(parent);
 787         return NULL;
 788 }
 789
 790 static void nfs4_opendata_free(struct kref *kref)
 791 {
 792         struct nfs4_opendata *p = container_of(kref,
 793                         struct nfs4_opendata, kref);
 794
 795         nfs_free_seqid(p->o_arg.seqid);
 796         if (p->state != NULL)
 797                 nfs4_put_open_state(p->state);
 798         nfs4_put_state_owner(p->owner);
 799         dput(p->dir);
 800         path_put(&p->path);
 801         kfree(p);
 802 }
 803
 804 static void nfs4_opendata_put(struct nfs4_opendata *p)
 805 {
 806         if (p != NULL)
 807                 kref_put(&p->kref, nfs4_opendata_free);
 808 }
 809
 810 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 811 {
 812         int ret;
 813
 814         ret = rpc_wait_for_completion_task(task);
 815         return ret;
 816 }
 817
 818 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 819 {
 820         int ret = 0;
 821
 822         if (open_mode & O_EXCL)
 823                 goto out;
 824         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 825                 case FMODE_READ:
 826                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 827                                 && state->n_rdonly != 0;
 828                         break;
 829                 case FMODE_WRITE:
 830                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 831                                 && state->n_wronly != 0;
 832                         break;
 833                 case FMODE_READ|FMODE_WRITE:
 834                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 835                                 && state->n_rdwr != 0;
 836         }
 837 out:
 838         return ret;
 839 }
 840
 841 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 842 {
 843         if ((delegation->type & fmode) != fmode)
 844                 return 0;
 845         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 846                 return 0;
 847         nfs_mark_delegation_referenced(delegation);
 848         return 1;
 849 }
 850
 851 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 852 {
 853         switch (fmode) {
 854                 case FMODE_WRITE:
 855                         state->n_wronly++;
 856                         break;
 857                 case FMODE_READ:
 858                         state->n_rdonly++;
 859                         break;
 860                 case FMODE_READ|FMODE_WRITE:
 861                         state->n_rdwr++;
 862         }
 863         nfs4_state_set_mode_locked(state, state->state | fmode);
 864 }
 865
 866 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 867 {
 868         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 869                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 870         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 871         switch (fmode) {
 872                 case FMODE_READ:
 873                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 874                         break;
 875                 case FMODE_WRITE:
 876                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 877                         break;
 878                 case FMODE_READ|FMODE_WRITE:
 879                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 880         }
 881 }
 882
 883 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 884 {
 885         write_seqlock(&state->seqlock);
 886         nfs_set_open_stateid_locked(state, stateid, fmode);
 887         write_sequnlock(&state->seqlock);
 888 }
 889
 890 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 891 {
 892         /*
 893          * Protect the call to nfs4_state_set_mode_locked and
 894          * serialise the stateid update
 895          */
 896         write_seqlock(&state->seqlock);
 897         if (deleg_stateid != NULL) {
 898                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 899                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 900         }
 901         if (open_stateid != NULL)
 902                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 903         write_sequnlock(&state->seqlock);
 904         spin_lock(&state->owner->so_lock);
 905         update_open_stateflags(state, fmode);
 906         spin_unlock(&state->owner->so_lock);
 907 }
 908
 909 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 910 {
 911         struct nfs_inode *nfsi = NFS_I(state->inode);
 912         struct nfs_delegation *deleg_cur;
 913         int ret = 0;
 914
 915         fmode &= (FMODE_READ|FMODE_WRITE);
 916
 917         rcu_read_lock();
 918         deleg_cur = rcu_dereference(nfsi->delegation);
 919         if (deleg_cur == NULL)
 920                 goto no_delegation;
 921
 922         spin_lock(&deleg_cur->lock);
 923         if (nfsi->delegation != deleg_cur ||
 924             (deleg_cur->type & fmode) != fmode)
 925                 goto no_delegation_unlock;
 926
 927         if (delegation == NULL)
 928                 delegation = &deleg_cur->stateid;
 929         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 930                 goto no_delegation_unlock;
 931
 932         nfs_mark_delegation_referenced(deleg_cur);
 933         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 934         ret = 1;
 935 no_delegation_unlock:
 936         spin_unlock(&deleg_cur->lock);
 937 no_delegation:
 938         rcu_read_unlock();
 939
 940         if (!ret && open_stateid != NULL) {
 941                 __update_open_stateid(state, open_stateid, NULL, fmode);
 942                 ret = 1;
 943         }
 944
 945         return ret;
 946 }
 947
 948
 949 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 950 {
 951         struct nfs_delegation *delegation;
 952
 953         rcu_read_lock();
 954         delegation = rcu_dereference(NFS_I(inode)->delegation);
 955         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 956                 rcu_read_unlock();
 957                 return;
 958         }
 959         rcu_read_unlock();
 960         nfs_inode_return_delegation(inode);
 961 }
 962
 963 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 964 {
 965         struct nfs4_state *state = opendata->state;
 966         struct nfs_inode *nfsi = NFS_I(state->inode);
 967         struct nfs_delegation *delegation;
 968         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 969         fmode_t fmode = opendata->o_arg.fmode;
 970         nfs4_stateid stateid;
 971         int ret = -EAGAIN;
 972
 973         for (;;) {
 974                 if (can_open_cached(state, fmode, open_mode)) {
 975                         spin_lock(&state->owner->so_lock);
 976                         if (can_open_cached(state, fmode, open_mode)) {
 977                                 update_open_stateflags(state, fmode);
 978                                 spin_unlock(&state->owner->so_lock);
 979                                 goto out_return_state;
 980                         }
 981                         spin_unlock(&state->owner->so_lock);
 982                 }
 983                 rcu_read_lock();
 984                 delegation = rcu_dereference(nfsi->delegation);
 985                 if (delegation == NULL ||
 986                     !can_open_delegated(delegation, fmode)) {
 987                         rcu_read_unlock();
 988                         break;
 989                 }
 990                 /* Save the delegation */
 991                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 992                 rcu_read_unlock();
 993                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 994                 if (ret != 0)
 995                         goto out;
 996                 ret = -EAGAIN;
 997
 998                 /* Try to update the stateid using the delegation */
 999                 if (update_open_stateid(state, NULL, &stateid, fmode))
1000                         goto out_return_state;
1001         }
1002 out:
1003         return ERR_PTR(ret);
1004 out_return_state:
1005         atomic_inc(&state->count);
1006         return state;
1007 }
1008
1009 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1010 {
1011         struct inode *inode;
1012         struct nfs4_state *state = NULL;
1013         struct nfs_delegation *delegation;
1014         int ret;
1015
1016         if (!data->rpc_done) {
1017                 state = nfs4_try_open_cached(data);
1018                 goto out;
1019         }
1020
1021         ret = -EAGAIN;
1022         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1023                 goto err;
1024         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1025         ret = PTR_ERR(inode);
1026         if (IS_ERR(inode))
1027                 goto err;
1028         ret = -ENOMEM;
1029         state = nfs4_get_open_state(inode, data->owner);
1030         if (state == NULL)
1031                 goto err_put_inode;
1032         if (data->o_res.delegation_type != 0) {
1033                 int delegation_flags = 0;
1034
1035                 rcu_read_lock();
1036                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1037                 if (delegation)
1038                         delegation_flags = delegation->flags;
1039                 rcu_read_unlock();
1040                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1041                         nfs_inode_set_delegation(state->inode,
1042                                         data->owner->so_cred,
1043                                         &data->o_res);
1044                 else
1045                         nfs_inode_reclaim_delegation(state->inode,
1046                                         data->owner->so_cred,
1047                                         &data->o_res);
1048         }
1049
1050         update_open_stateid(state, &data->o_res.stateid, NULL,
1051                         data->o_arg.fmode);
1052         iput(inode);
1053 out:
1054         return state;
1055 err_put_inode:
1056         iput(inode);
1057 err:
1058         return ERR_PTR(ret);
1059 }
1060
1061 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1062 {
1063         struct nfs_inode *nfsi = NFS_I(state->inode);
1064         struct nfs_open_context *ctx;
1065
1066         spin_lock(&state->inode->i_lock);
1067         list_for_each_entry(ctx, &nfsi->open_files, list) {
1068                 if (ctx->state != state)
1069                         continue;
1070                 get_nfs_open_context(ctx);
1071                 spin_unlock(&state->inode->i_lock);
1072                 return ctx;
1073         }
1074         spin_unlock(&state->inode->i_lock);
1075         return ERR_PTR(-ENOENT);
1076 }
1077
1078 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1079 {
1080         struct nfs4_opendata *opendata;
1081
1082         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1083         if (opendata == NULL)
1084                 return ERR_PTR(-ENOMEM);
1085         opendata->state = state;
1086         atomic_inc(&state->count);
1087         return opendata;
1088 }
1089
1090 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1091 {
1092         struct nfs4_state *newstate;
1093         int ret;
1094
1095         opendata->o_arg.open_flags = 0;
1096         opendata->o_arg.fmode = fmode;
1097         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1098         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1099         nfs4_init_opendata_res(opendata);
1100         ret = _nfs4_recover_proc_open(opendata);
1101         if (ret != 0)
1102                 return ret;
1103         newstate = nfs4_opendata_to_nfs4_state(opendata);
1104         if (IS_ERR(newstate))
1105                 return PTR_ERR(newstate);
1106         nfs4_close_state(&opendata->path, newstate, fmode);
1107         *res = newstate;
1108         return 0;
1109 }
1110
1111 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1112 {
1113         struct nfs4_state *newstate;
1114         int ret;
1115
1116         /* memory barrier prior to reading state->n_* */
1117         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1118         smp_rmb();
1119         if (state->n_rdwr != 0) {
1120                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1121                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1122                 if (ret != 0)
1123                         return ret;
1124                 if (newstate != state)
1125                         return -ESTALE;
1126         }
1127         if (state->n_wronly != 0) {
1128                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1129                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1130                 if (ret != 0)
1131                         return ret;
1132                 if (newstate != state)
1133                         return -ESTALE;
1134         }
1135         if (state->n_rdonly != 0) {
1136                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1137                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1138                 if (ret != 0)
1139                         return ret;
1140                 if (newstate != state)
1141                         return -ESTALE;
1142         }
1143         /*
1144          * We may have performed cached opens for all three recoveries.
1145          * Check if we need to update the current stateid.
1146          */
1147         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1148             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1149                 write_seqlock(&state->seqlock);
1150                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1151                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1152                 write_sequnlock(&state->seqlock);
1153         }
1154         return 0;
1155 }
1156
1157 /*
1158  * OPEN_RECLAIM:
1159  *      reclaim state on the server after a reboot.
1160  */
1161 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1162 {
1163         struct nfs_delegation *delegation;
1164         struct nfs4_opendata *opendata;
1165         fmode_t delegation_type = 0;
1166         int status;
1167
1168         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1169         if (IS_ERR(opendata))
1170                 return PTR_ERR(opendata);
1171         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1172         opendata->o_arg.fh = NFS_FH(state->inode);
1173         rcu_read_lock();
1174         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1175         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1176                 delegation_type = delegation->type;
1177         rcu_read_unlock();
1178         opendata->o_arg.u.delegation_type = delegation_type;
1179         status = nfs4_open_recover(opendata, state);
1180         nfs4_opendata_put(opendata);
1181         return status;
1182 }
1183
1184 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1185 {
1186         struct nfs_server *server = NFS_SERVER(state->inode);
1187         struct nfs4_exception exception = { };
1188         int err;
1189         do {
1190                 err = _nfs4_do_open_reclaim(ctx, state);
1191                 if (err != -NFS4ERR_DELAY)
1192                         break;
1193                 nfs4_handle_exception(server, err, &exception);
1194         } while (exception.retry);
1195         return err;
1196 }
1197
1198 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1199 {
1200         struct nfs_open_context *ctx;
1201         int ret;
1202
1203         ctx = nfs4_state_find_open_context(state);
1204         if (IS_ERR(ctx))
1205                 return PTR_ERR(ctx);
1206         ret = nfs4_do_open_reclaim(ctx, state);
1207         put_nfs_open_context(ctx);
1208         return ret;
1209 }
1210
1211 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1212 {
1213         struct nfs4_opendata *opendata;
1214         int ret;
1215
1216         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1217         if (IS_ERR(opendata))
1218                 return PTR_ERR(opendata);
1219         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1220         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1221                         sizeof(opendata->o_arg.u.delegation.data));
1222         ret = nfs4_open_recover(opendata, state);
1223         nfs4_opendata_put(opendata);
1224         return ret;
1225 }
1226
1227 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1228 {
1229         struct nfs4_exception exception = { };
1230         struct nfs_server *server = NFS_SERVER(state->inode);
1231         int err;
1232         do {
1233                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1234                 switch (err) {
1235                         case 0:
1236                         case -ENOENT:
1237                         case -ESTALE:
1238                                 goto out;
1239                         case -NFS4ERR_BADSESSION:
1240                         case -NFS4ERR_BADSLOT:
1241                         case -NFS4ERR_BAD_HIGH_SLOT:
1242                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1243                         case -NFS4ERR_DEADSESSION:
1244                                 nfs4_schedule_state_recovery(
1245                                         server->nfs_client);
1246                                 goto out;
1247                         case -NFS4ERR_STALE_CLIENTID:
1248                         case -NFS4ERR_STALE_STATEID:
1249                         case -NFS4ERR_EXPIRED:
1250                                 /* Don't recall a delegation if it was lost */
1251                                 nfs4_schedule_state_recovery(server->nfs_client);
1252                                 goto out;
1253                         case -ERESTARTSYS:
1254                                 /*
1255                                  * The show must go on: exit, but mark the
1256                                  * stateid as needing recovery.
1257                                  */
1258                         case -NFS4ERR_ADMIN_REVOKED:
1259                         case -NFS4ERR_BAD_STATEID:
1260                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1261                         case -EKEYEXPIRED:
1262                                 /*
1263                                  * User RPCSEC_GSS context has expired.
1264                                  * We cannot recover this stateid now, so
1265                                  * skip it and allow recovery thread to
1266                                  * proceed.
1267                                  */
1268                         case -ENOMEM:
1269                                 err = 0;
1270                                 goto out;
1271                 }
1272                 err = nfs4_handle_exception(server, err, &exception);
1273         } while (exception.retry);
1274 out:
1275         return err;
1276 }
1277
1278 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1279 {
1280         struct nfs4_opendata *data = calldata;
1281
1282         data->rpc_status = task->tk_status;
1283         if (data->rpc_status == 0) {
1284                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1285                                 sizeof(data->o_res.stateid.data));
1286                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1287                 renew_lease(data->o_res.server, data->timestamp);
1288                 data->rpc_done = 1;
1289         }
1290 }
1291
1292 static void nfs4_open_confirm_release(void *calldata)
1293 {
1294         struct nfs4_opendata *data = calldata;
1295         struct nfs4_state *state = NULL;
1296
1297         /* If this request hasn't been cancelled, do nothing */
1298         if (data->cancelled == 0)
1299                 goto out_free;
1300         /* In case of error, no cleanup! */
1301         if (!data->rpc_done)
1302                 goto out_free;
1303         state = nfs4_opendata_to_nfs4_state(data);
1304         if (!IS_ERR(state))
1305                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1306 out_free:
1307         nfs4_opendata_put(data);
1308 }
1309
1310 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1311         .rpc_call_done = nfs4_open_confirm_done,
1312         .rpc_release = nfs4_open_confirm_release,
1313 };
1314
1315 /*
1316  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1317  */
1318 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1319 {
1320         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1321         struct rpc_task *task;
1322         struct  rpc_message msg = {
1323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1324                 .rpc_argp = &data->c_arg,
1325                 .rpc_resp = &data->c_res,
1326                 .rpc_cred = data->owner->so_cred,
1327         };
1328         struct rpc_task_setup task_setup_data = {
1329                 .rpc_client = server->client,
1330                 .rpc_message = &msg,
1331                 .callback_ops = &nfs4_open_confirm_ops,
1332                 .callback_data = data,
1333                 .workqueue = nfsiod_workqueue,
1334                 .flags = RPC_TASK_ASYNC,
1335         };
1336         int status;
1337
1338         kref_get(&data->kref);
1339         data->rpc_done = 0;
1340         data->rpc_status = 0;
1341         data->timestamp = jiffies;
1342         task = rpc_run_task(&task_setup_data);
1343         if (IS_ERR(task))
1344                 return PTR_ERR(task);
1345         status = nfs4_wait_for_completion_rpc_task(task);
1346         if (status != 0) {
1347                 data->cancelled = 1;
1348                 smp_wmb();
1349         } else
1350                 status = data->rpc_status;
1351         rpc_put_task(task);
1352         return status;
1353 }
1354
1355 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1356 {
1357         struct nfs4_opendata *data = calldata;
1358         struct nfs4_state_owner *sp = data->owner;
1359
1360         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1361                 return;
1362         /*
1363          * Check if we still need to send an OPEN call, or if we can use
1364          * a delegation instead.
1365          */
1366         if (data->state != NULL) {
1367                 struct nfs_delegation *delegation;
1368
1369                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1370                         goto out_no_action;
1371                 rcu_read_lock();
1372                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1373                 if (delegation != NULL &&
1374                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1375                         rcu_read_unlock();
1376                         goto out_no_action;
1377                 }
1378                 rcu_read_unlock();
1379         }
1380         /* Update sequence id. */
1381         data->o_arg.id = sp->so_owner_id.id;
1382         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1383         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1384                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1385                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1386         }
1387         data->timestamp = jiffies;
1388         if (nfs4_setup_sequence(data->o_arg.server,
1389                                 &data->o_arg.seq_args,
1390                                 &data->o_res.seq_res, 1, task))
1391                 return;
1392         rpc_call_start(task);
1393         return;
1394 out_no_action:
1395         task->tk_action = NULL;
1396
1397 }
1398
1399 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1400 {
1401         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1402         nfs4_open_prepare(task, calldata);
1403 }
1404
1405 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1406 {
1407         struct nfs4_opendata *data = calldata;
1408
1409         data->rpc_status = task->tk_status;
1410
1411         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1412                 return;
1413
1414         if (task->tk_status == 0) {
1415                 switch (data->o_res.f_attr->mode & S_IFMT) {
1416                         case S_IFREG:
1417                                 break;
1418                         case S_IFLNK:
1419                                 data->rpc_status = -ELOOP;
1420                                 break;
1421                         case S_IFDIR:
1422                                 data->rpc_status = -EISDIR;
1423                                 break;
1424                         default:
1425                                 data->rpc_status = -ENOTDIR;
1426                 }
1427                 renew_lease(data->o_res.server, data->timestamp);
1428                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1429                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1430         }
1431         data->rpc_done = 1;
1432 }
1433
1434 static void nfs4_open_release(void *calldata)
1435 {
1436         struct nfs4_opendata *data = calldata;
1437         struct nfs4_state *state = NULL;
1438
1439         /* If this request hasn't been cancelled, do nothing */
1440         if (data->cancelled == 0)
1441                 goto out_free;
1442         /* In case of error, no cleanup! */
1443         if (data->rpc_status != 0 || !data->rpc_done)
1444                 goto out_free;
1445         /* In case we need an open_confirm, no cleanup! */
1446         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1447                 goto out_free;
1448         state = nfs4_opendata_to_nfs4_state(data);
1449         if (!IS_ERR(state))
1450                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1451 out_free:
1452         nfs4_opendata_put(data);
1453 }
1454
1455 static const struct rpc_call_ops nfs4_open_ops = {
1456         .rpc_call_prepare = nfs4_open_prepare,
1457         .rpc_call_done = nfs4_open_done,
1458         .rpc_release = nfs4_open_release,
1459 };
1460
1461 static const struct rpc_call_ops nfs4_recover_open_ops = {
1462         .rpc_call_prepare = nfs4_recover_open_prepare,
1463         .rpc_call_done = nfs4_open_done,
1464         .rpc_release = nfs4_open_release,
1465 };
1466
1467 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1468 {
1469         struct inode *dir = data->dir->d_inode;
1470         struct nfs_server *server = NFS_SERVER(dir);
1471         struct nfs_openargs *o_arg = &data->o_arg;
1472         struct nfs_openres *o_res = &data->o_res;
1473         struct rpc_task *task;
1474         struct rpc_message msg = {
1475                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1476                 .rpc_argp = o_arg,
1477                 .rpc_resp = o_res,
1478                 .rpc_cred = data->owner->so_cred,
1479         };
1480         struct rpc_task_setup task_setup_data = {
1481                 .rpc_client = server->client,
1482                 .rpc_message = &msg,
1483                 .callback_ops = &nfs4_open_ops,
1484                 .callback_data = data,
1485                 .workqueue = nfsiod_workqueue,
1486                 .flags = RPC_TASK_ASYNC,
1487         };
1488         int status;
1489
1490         kref_get(&data->kref);
1491         data->rpc_done = 0;
1492         data->rpc_status = 0;
1493         data->cancelled = 0;
1494         if (isrecover)
1495                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1496         task = rpc_run_task(&task_setup_data);
1497         if (IS_ERR(task))
1498                 return PTR_ERR(task);
1499         status = nfs4_wait_for_completion_rpc_task(task);
1500         if (status != 0) {
1501                 data->cancelled = 1;
1502                 smp_wmb();
1503         } else
1504                 status = data->rpc_status;
1505         rpc_put_task(task);
1506
1507         return status;
1508 }
1509
1510 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1511 {
1512         struct inode *dir = data->dir->d_inode;
1513         struct nfs_openres *o_res = &data->o_res;
1514         int status;
1515
1516         status = nfs4_run_open_task(data, 1);
1517         if (status != 0 || !data->rpc_done)
1518                 return status;
1519
1520         nfs_refresh_inode(dir, o_res->dir_attr);
1521
1522         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1523                 status = _nfs4_proc_open_confirm(data);
1524                 if (status != 0)
1525                         return status;
1526         }
1527
1528         return status;
1529 }
1530
1531 /*
1532  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1533  */
1534 static int _nfs4_proc_open(struct nfs4_opendata *data)
1535 {
1536         struct inode *dir = data->dir->d_inode;
1537         struct nfs_server *server = NFS_SERVER(dir);
1538         struct nfs_openargs *o_arg = &data->o_arg;
1539         struct nfs_openres *o_res = &data->o_res;
1540         int status;
1541
1542         status = nfs4_run_open_task(data, 0);
1543         if (status != 0 || !data->rpc_done)
1544                 return status;
1545
1546         if (o_arg->open_flags & O_CREAT) {
1547                 update_changeattr(dir, &o_res->cinfo);
1548                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1549         } else
1550                 nfs_refresh_inode(dir, o_res->dir_attr);
1551         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1552                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1553         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1554                 status = _nfs4_proc_open_confirm(data);
1555                 if (status != 0)
1556                         return status;
1557         }
1558         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1559                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1560         return 0;
1561 }
1562
1563 static int nfs4_recover_expired_lease(struct nfs_server *server)
1564 {
1565         struct nfs_client *clp = server->nfs_client;
1566         unsigned int loop;
1567         int ret;
1568
1569         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1570                 ret = nfs4_wait_clnt_recover(clp);
1571                 if (ret != 0)
1572                         break;
1573                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1574                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1575                         break;
1576                 nfs4_schedule_state_recovery(clp);
1577                 ret = -EIO;
1578         }
1579         return ret;
1580 }
1581
1582 /*
1583  * OPEN_EXPIRED:
1584  *      reclaim state on the server after a network partition.
1585  *      Assumes caller holds the appropriate lock
1586  */
1587 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1588 {
1589         struct nfs4_opendata *opendata;
1590         int ret;
1591
1592         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1593         if (IS_ERR(opendata))
1594                 return PTR_ERR(opendata);
1595         ret = nfs4_open_recover(opendata, state);
1596         if (ret == -ESTALE)
1597                 d_drop(ctx->path.dentry);
1598         nfs4_opendata_put(opendata);
1599         return ret;
1600 }
1601
1602 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1603 {
1604         struct nfs_server *server = NFS_SERVER(state->inode);
1605         struct nfs4_exception exception = { };
1606         int err;
1607
1608         do {
1609                 err = _nfs4_open_expired(ctx, state);
1610                 switch (err) {
1611                 default:
1612                         goto out;
1613                 case -NFS4ERR_GRACE:
1614                 case -NFS4ERR_DELAY:
1615                         nfs4_handle_exception(server, err, &exception);
1616                         err = 0;
1617                 }
1618         } while (exception.retry);
1619 out:
1620         return err;
1621 }
1622
1623 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1624 {
1625         struct nfs_open_context *ctx;
1626         int ret;
1627
1628         ctx = nfs4_state_find_open_context(state);
1629         if (IS_ERR(ctx))
1630                 return PTR_ERR(ctx);
1631         ret = nfs4_do_open_expired(ctx, state);
1632         put_nfs_open_context(ctx);
1633         return ret;
1634 }
1635
1636 /*
1637  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1638  * fields corresponding to attributes that were used to store the verifier.
1639  * Make sure we clobber those fields in the later setattr call
1640  */
1641 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1642 {
1643         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1644             !(sattr->ia_valid & ATTR_ATIME_SET))
1645                 sattr->ia_valid |= ATTR_ATIME;
1646
1647         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1648             !(sattr->ia_valid & ATTR_MTIME_SET))
1649                 sattr->ia_valid |= ATTR_MTIME;
1650 }
1651
1652 /*
1653  * Returns a referenced nfs4_state
1654  */
1655 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1656 {
1657         struct nfs4_state_owner  *sp;
1658         struct nfs4_state     *state = NULL;
1659         struct nfs_server       *server = NFS_SERVER(dir);
1660         struct nfs4_opendata *opendata;
1661         int status;
1662
1663         /* Protect against reboot recovery conflicts */
1664         status = -ENOMEM;
1665         if (!(sp = nfs4_get_state_owner(server, cred))) {
1666                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1667                 goto out_err;
1668         }
1669         status = nfs4_recover_expired_lease(server);
1670         if (status != 0)
1671                 goto err_put_state_owner;
1672         if (path->dentry->d_inode != NULL)
1673                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1674         status = -ENOMEM;
1675         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1676         if (opendata == NULL)
1677                 goto err_put_state_owner;
1678
1679         if (path->dentry->d_inode != NULL)
1680                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1681
1682         status = _nfs4_proc_open(opendata);
1683         if (status != 0)
1684                 goto err_opendata_put;
1685
1686         state = nfs4_opendata_to_nfs4_state(opendata);
1687         status = PTR_ERR(state);
1688         if (IS_ERR(state))
1689                 goto err_opendata_put;
1690         if (server->caps & NFS_CAP_POSIX_LOCK)
1691                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1692
1693         if (opendata->o_arg.open_flags & O_EXCL) {
1694                 nfs4_exclusive_attrset(opendata, sattr);
1695
1696                 nfs_fattr_init(opendata->o_res.f_attr);
1697                 status = nfs4_do_setattr(state->inode, cred,
1698                                 opendata->o_res.f_attr, sattr,
1699                                 state);
1700                 if (status == 0)
1701                         nfs_setattr_update_inode(state->inode, sattr);
1702                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1703         }
1704         nfs4_opendata_put(opendata);
1705         nfs4_put_state_owner(sp);
1706         *res = state;
1707         return 0;
1708 err_opendata_put:
1709         nfs4_opendata_put(opendata);
1710 err_put_state_owner:
1711         nfs4_put_state_owner(sp);
1712 out_err:
1713         *res = NULL;
1714         return status;
1715 }
1716
1717
1718 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1719 {
1720         struct nfs4_exception exception = { };
1721         struct nfs4_state *res;
1722         int status;
1723
1724         do {
1725                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1726                 if (status == 0)
1727                         break;
1728                 /* NOTE: BAD_SEQID means the server and client disagree about the
1729                  * book-keeping w.r.t. state-changing operations
1730                  * (OPEN/CLOSE/LOCK/LOCKU...)
1731                  * It is actually a sign of a bug on the client or on the server.
1732                  *
1733                  * If we receive a BAD_SEQID error in the particular case of
1734                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1735                  * have unhashed the old state_owner for us, and that we can
1736                  * therefore safely retry using a new one. We should still warn
1737                  * the user though...
1738                  */
1739                 if (status == -NFS4ERR_BAD_SEQID) {
1740                         printk(KERN_WARNING "NFS: v4 server %s "
1741                                         " returned a bad sequence-id error!\n",
1742                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1743                         exception.retry = 1;
1744                         continue;
1745                 }
1746                 /*
1747                  * BAD_STATEID on OPEN means that the server cancelled our
1748                  * state before it received the OPEN_CONFIRM.
1749                  * Recover by retrying the request as per the discussion
1750                  * on Page 181 of RFC3530.
1751                  */
1752                 if (status == -NFS4ERR_BAD_STATEID) {
1753                         exception.retry = 1;
1754                         continue;
1755                 }
1756                 if (status == -EAGAIN) {
1757                         /* We must have found a delegation */
1758                         exception.retry = 1;
1759                         continue;
1760                 }
1761                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1762                                         status, &exception));
1763         } while (exception.retry);
1764         return res;
1765 }
1766
1767 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1768                             struct nfs_fattr *fattr, struct iattr *sattr,
1769                             struct nfs4_state *state)
1770 {
1771         struct nfs_server *server = NFS_SERVER(inode);
1772         struct nfs_setattrargs  arg = {
1773                 .fh             = NFS_FH(inode),
1774                 .iap            = sattr,
1775                 .server         = server,
1776                 .bitmask = server->attr_bitmask,
1777         };
1778         struct nfs_setattrres  res = {
1779                 .fattr          = fattr,
1780                 .server         = server,
1781         };
1782         struct rpc_message msg = {
1783                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1784                 .rpc_argp       = &arg,
1785                 .rpc_resp       = &res,
1786                 .rpc_cred       = cred,
1787         };
1788         unsigned long timestamp = jiffies;
1789         int status;
1790
1791         nfs_fattr_init(fattr);
1792
1793         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1794                 /* Use that stateid */
1795         } else if (state != NULL) {
1796                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1797         } else
1798                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1799
1800         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1801         if (status == 0 && state != NULL)
1802                 renew_lease(server, timestamp);
1803         return status;
1804 }
1805
1806 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1807                            struct nfs_fattr *fattr, struct iattr *sattr,
1808                            struct nfs4_state *state)
1809 {
1810         struct nfs_server *server = NFS_SERVER(inode);
1811         struct nfs4_exception exception = { };
1812         int err;
1813         do {
1814                 err = nfs4_handle_exception(server,
1815                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1816                                 &exception);
1817         } while (exception.retry);
1818         return err;
1819 }
1820
1821 struct nfs4_closedata {
1822         struct path path;
1823         struct inode *inode;
1824         struct nfs4_state *state;
1825         struct nfs_closeargs arg;
1826         struct nfs_closeres res;
1827         struct nfs_fattr fattr;
1828         unsigned long timestamp;
1829 };
1830
1831 static void nfs4_free_closedata(void *data)
1832 {
1833         struct nfs4_closedata *calldata = data;
1834         struct nfs4_state_owner *sp = calldata->state->owner;
1835
1836         nfs4_put_open_state(calldata->state);
1837         nfs_free_seqid(calldata->arg.seqid);
1838         nfs4_put_state_owner(sp);
1839         path_put(&calldata->path);
1840         kfree(calldata);
1841 }
1842
1843 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1844                 fmode_t fmode)
1845 {
1846         spin_lock(&state->owner->so_lock);
1847         if (!(fmode & FMODE_READ))
1848                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1849         if (!(fmode & FMODE_WRITE))
1850                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1851         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1852         spin_unlock(&state->owner->so_lock);
1853 }
1854
1855 static void nfs4_close_done(struct rpc_task *task, void *data)
1856 {
1857         struct nfs4_closedata *calldata = data;
1858         struct nfs4_state *state = calldata->state;
1859         struct nfs_server *server = NFS_SERVER(calldata->inode);
1860
1861         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1862                 return;
1863         /* hmm. we are done with the inode, and in the process of freeing
1864          * the state_owner. we keep this around to process errors
1865          */
1866         switch (task->tk_status) {
1867                 case 0:
1868                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1869                         renew_lease(server, calldata->timestamp);
1870                         nfs4_close_clear_stateid_flags(state,
1871                                         calldata->arg.fmode);
1872                         break;
1873                 case -NFS4ERR_STALE_STATEID:
1874                 case -NFS4ERR_OLD_STATEID:
1875                 case -NFS4ERR_BAD_STATEID:
1876                 case -NFS4ERR_EXPIRED:
1877                         if (calldata->arg.fmode == 0)
1878                                 break;
1879                 default:
1880                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1881                                 rpc_restart_call_prepare(task);
1882         }
1883         nfs_release_seqid(calldata->arg.seqid);
1884         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1885 }
1886
1887 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1888 {
1889         struct nfs4_closedata *calldata = data;
1890         struct nfs4_state *state = calldata->state;
1891         int call_close = 0;
1892
1893         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1894                 return;
1895
1896         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1897         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1898         spin_lock(&state->owner->so_lock);
1899         /* Calculate the change in open mode */
1900         if (state->n_rdwr == 0) {
1901                 if (state->n_rdonly == 0) {
1902                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1903                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1904                         calldata->arg.fmode &= ~FMODE_READ;
1905                 }
1906                 if (state->n_wronly == 0) {
1907                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1908                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1909                         calldata->arg.fmode &= ~FMODE_WRITE;
1910                 }
1911         }
1912         spin_unlock(&state->owner->so_lock);
1913
1914         if (!call_close) {
1915                 /* Note: exit _without_ calling nfs4_close_done */
1916                 task->tk_action = NULL;
1917                 return;
1918         }
1919
1920         if (calldata->arg.fmode == 0)
1921                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1922
1923         nfs_fattr_init(calldata->res.fattr);
1924         calldata->timestamp = jiffies;
1925         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1926                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1927                                 1, task))
1928                 return;
1929         rpc_call_start(task);
1930 }
1931
1932 static const struct rpc_call_ops nfs4_close_ops = {
1933         .rpc_call_prepare = nfs4_close_prepare,
1934         .rpc_call_done = nfs4_close_done,
1935         .rpc_release = nfs4_free_closedata,
1936 };
1937
1938 /*
1939  * It is possible for data to be read/written from a mem-mapped file
1940  * after the sys_close call (which hits the vfs layer as a flush).
1941  * This means that we can't safely call nfsv4 close on a file until
1942  * the inode is cleared. This in turn means that we are not good
1943  * NFSv4 citizens - we do not indicate to the server to update the file's
1944  * share state even when we are done with one of the three share
1945  * stateid's in the inode.
1946  *
1947  * NOTE: Caller must be holding the sp->so_owner semaphore!
1948  */
1949 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1950 {
1951         struct nfs_server *server = NFS_SERVER(state->inode);
1952         struct nfs4_closedata *calldata;
1953         struct nfs4_state_owner *sp = state->owner;
1954         struct rpc_task *task;
1955         struct rpc_message msg = {
1956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1957                 .rpc_cred = state->owner->so_cred,
1958         };
1959         struct rpc_task_setup task_setup_data = {
1960                 .rpc_client = server->client,
1961                 .rpc_message = &msg,
1962                 .callback_ops = &nfs4_close_ops,
1963                 .workqueue = nfsiod_workqueue,
1964                 .flags = RPC_TASK_ASYNC,
1965         };
1966         int status = -ENOMEM;
1967
1968         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1969         if (calldata == NULL)
1970                 goto out;
1971         calldata->inode = state->inode;
1972         calldata->state = state;
1973         calldata->arg.fh = NFS_FH(state->inode);
1974         calldata->arg.stateid = &state->open_stateid;
1975         /* Serialization for the sequence id */
1976         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1977         if (calldata->arg.seqid == NULL)
1978                 goto out_free_calldata;
1979         calldata->arg.fmode = 0;
1980         calldata->arg.bitmask = server->cache_consistency_bitmask;
1981         calldata->res.fattr = &calldata->fattr;
1982         calldata->res.seqid = calldata->arg.seqid;
1983         calldata->res.server = server;
1984         path_get(path);
1985         calldata->path = *path;
1986
1987         msg.rpc_argp = &calldata->arg,
1988         msg.rpc_resp = &calldata->res,
1989         task_setup_data.callback_data = calldata;
1990         task = rpc_run_task(&task_setup_data);
1991         if (IS_ERR(task))
1992                 return PTR_ERR(task);
1993         status = 0;
1994         if (wait)
1995                 status = rpc_wait_for_completion_task(task);
1996         rpc_put_task(task);
1997         return status;
1998 out_free_calldata:
1999         kfree(calldata);
2000 out:
2001         nfs4_put_open_state(state);
2002         nfs4_put_state_owner(sp);
2003         return status;
2004 }
2005
2006 static struct inode *
2007 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2008 {
2009         struct nfs4_state *state;
2010
2011         /* Protect against concurrent sillydeletes */
2012         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2013         if (IS_ERR(state))
2014                 return ERR_CAST(state);
2015         ctx->state = state;
2016         return igrab(state->inode);
2017 }
2018
2019 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2020 {
2021         if (ctx->state == NULL)
2022                 return;
2023         if (is_sync)
2024                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2025         else
2026                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2027 }
2028
2029 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2030 {
2031         struct nfs4_server_caps_arg args = {
2032                 .fhandle = fhandle,
2033         };
2034         struct nfs4_server_caps_res res = {};
2035         struct rpc_message msg = {
2036                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2037                 .rpc_argp = &args,
2038                 .rpc_resp = &res,
2039         };
2040         int status;
2041
2042         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2043         if (status == 0) {
2044                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2045                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2046                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2047                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2048                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2049                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2050                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2051                         server->caps |= NFS_CAP_ACLS;
2052                 if (res.has_links != 0)
2053                         server->caps |= NFS_CAP_HARDLINKS;
2054                 if (res.has_symlinks != 0)
2055                         server->caps |= NFS_CAP_SYMLINKS;
2056                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2057                         server->caps |= NFS_CAP_FILEID;
2058                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2059                         server->caps |= NFS_CAP_MODE;
2060                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2061                         server->caps |= NFS_CAP_NLINK;
2062                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2063                         server->caps |= NFS_CAP_OWNER;
2064                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2065                         server->caps |= NFS_CAP_OWNER_GROUP;
2066                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2067                         server->caps |= NFS_CAP_ATIME;
2068                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2069                         server->caps |= NFS_CAP_CTIME;
2070                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2071                         server->caps |= NFS_CAP_MTIME;
2072
2073                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2074                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2075                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2076                 server->acl_bitmask = res.acl_bitmask;
2077         }
2078
2079         return status;
2080 }
2081
2082 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2083 {
2084         struct nfs4_exception exception = { };
2085         int err;
2086         do {
2087                 err = nfs4_handle_exception(server,
2088                                 _nfs4_server_capabilities(server, fhandle),
2089                                 &exception);
2090         } while (exception.retry);
2091         return err;
2092 }
2093
2094 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2095                 struct nfs_fsinfo *info)
2096 {
2097         struct nfs4_lookup_root_arg args = {
2098                 .bitmask = nfs4_fattr_bitmap,
2099         };
2100         struct nfs4_lookup_res res = {
2101                 .server = server,
2102                 .fattr = info->fattr,
2103                 .fh = fhandle,
2104         };
2105         struct rpc_message msg = {
2106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2107                 .rpc_argp = &args,
2108                 .rpc_resp = &res,
2109         };
2110
2111         nfs_fattr_init(info->fattr);
2112         return nfs4_call_sync(server, &msg, &args, &res, 0);
2113 }
2114
2115 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2116                 struct nfs_fsinfo *info)
2117 {
2118         struct nfs4_exception exception = { };
2119         int err;
2120         do {
2121                 err = nfs4_handle_exception(server,
2122                                 _nfs4_lookup_root(server, fhandle, info),
2123                                 &exception);
2124         } while (exception.retry);
2125         return err;
2126 }
2127
2128 /*
2129  * get the file handle for the "/" directory on the server
2130  */
2131 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2132                               struct nfs_fsinfo *info)
2133 {
2134         int status;
2135
2136         status = nfs4_lookup_root(server, fhandle, info);
2137         if (status == 0)
2138                 status = nfs4_server_capabilities(server, fhandle);
2139         if (status == 0)
2140                 status = nfs4_do_fsinfo(server, fhandle, info);
2141         return nfs4_map_errors(status);
2142 }
2143
2144 /*
2145  * Get locations and (maybe) other attributes of a referral.
2146  * Note that we'll actually follow the referral later when
2147  * we detect fsid mismatch in inode revalidation
2148  */
2149 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2150 {
2151         int status = -ENOMEM;
2152         struct page *page = NULL;
2153         struct nfs4_fs_locations *locations = NULL;
2154
2155         page = alloc_page(GFP_KERNEL);
2156         if (page == NULL)
2157                 goto out;
2158         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2159         if (locations == NULL)
2160                 goto out;
2161
2162         status = nfs4_proc_fs_locations(dir, name, locations, page);
2163         if (status != 0)
2164                 goto out;
2165         /* Make sure server returned a different fsid for the referral */
2166         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2167                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2168                 status = -EIO;
2169                 goto out;
2170         }
2171
2172         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2173         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2174         if (!fattr->mode)
2175                 fattr->mode = S_IFDIR;
2176         memset(fhandle, 0, sizeof(struct nfs_fh));
2177 out:
2178         if (page)
2179                 __free_page(page);
2180         kfree(locations);
2181         return status;
2182 }
2183
2184 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2185 {
2186         struct nfs4_getattr_arg args = {
2187                 .fh = fhandle,
2188                 .bitmask = server->attr_bitmask,
2189         };
2190         struct nfs4_getattr_res res = {
2191                 .fattr = fattr,
2192                 .server = server,
2193         };
2194         struct rpc_message msg = {
2195                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2196                 .rpc_argp = &args,
2197                 .rpc_resp = &res,
2198         };
2199
2200         nfs_fattr_init(fattr);
2201         return nfs4_call_sync(server, &msg, &args, &res, 0);
2202 }
2203
2204 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2205 {
2206         struct nfs4_exception exception = { };
2207         int err;
2208         do {
2209                 err = nfs4_handle_exception(server,
2210                                 _nfs4_proc_getattr(server, fhandle, fattr),
2211                                 &exception);
2212         } while (exception.retry);
2213         return err;
2214 }
2215
2216 /*
2217  * The file is not closed if it is opened due to the a request to change
2218  * the size of the file. The open call will not be needed once the
2219  * VFS layer lookup-intents are implemented.
2220  *
2221  * Close is called when the inode is destroyed.
2222  * If we haven't opened the file for O_WRONLY, we
2223  * need to in the size_change case to obtain a stateid.
2224  *
2225  * Got race?
2226  * Because OPEN is always done by name in nfsv4, it is
2227  * possible that we opened a different file by the same
2228  * name.  We can recognize this race condition, but we
2229  * can't do anything about it besides returning an error.
2230  *
2231  * This will be fixed with VFS changes (lookup-intent).
2232  */
2233 static int
2234 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2235                   struct iattr *sattr)
2236 {
2237         struct inode *inode = dentry->d_inode;
2238         struct rpc_cred *cred = NULL;
2239         struct nfs4_state *state = NULL;
2240         int status;
2241
2242         nfs_fattr_init(fattr);
2243
2244         /* Search for an existing open(O_WRITE) file */
2245         if (sattr->ia_valid & ATTR_FILE) {
2246                 struct nfs_open_context *ctx;
2247
2248                 ctx = nfs_file_open_context(sattr->ia_file);
2249                 if (ctx) {
2250                         cred = ctx->cred;
2251                         state = ctx->state;
2252                 }
2253         }
2254
2255         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2256         if (status == 0)
2257                 nfs_setattr_update_inode(inode, sattr);
2258         return status;
2259 }
2260
2261 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2262                 const struct qstr *name, struct nfs_fh *fhandle,
2263                 struct nfs_fattr *fattr)
2264 {
2265         int                    status;
2266         struct nfs4_lookup_arg args = {
2267                 .bitmask = server->attr_bitmask,
2268                 .dir_fh = dirfh,
2269                 .name = name,
2270         };
2271         struct nfs4_lookup_res res = {
2272                 .server = server,
2273                 .fattr = fattr,
2274                 .fh = fhandle,
2275         };
2276         struct rpc_message msg = {
2277                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2278                 .rpc_argp = &args,
2279                 .rpc_resp = &res,
2280         };
2281
2282         nfs_fattr_init(fattr);
2283
2284         dprintk("NFS call  lookupfh %s\n", name->name);
2285         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2286         dprintk("NFS reply lookupfh: %d\n", status);
2287         return status;
2288 }
2289
2290 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2291                               struct qstr *name, struct nfs_fh *fhandle,
2292                               struct nfs_fattr *fattr)
2293 {
2294         struct nfs4_exception exception = { };
2295         int err;
2296         do {
2297                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2298                 /* FIXME: !!!! */
2299                 if (err == -NFS4ERR_MOVED) {
2300                         err = -EREMOTE;
2301                         break;
2302                 }
2303                 err = nfs4_handle_exception(server, err, &exception);
2304         } while (exception.retry);
2305         return err;
2306 }
2307
2308 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2309                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2310 {
2311         int status;
2312
2313         dprintk("NFS call  lookup %s\n", name->name);
2314         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2315         if (status == -NFS4ERR_MOVED)
2316                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2317         dprintk("NFS reply lookup: %d\n", status);
2318         return status;
2319 }
2320
2321 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2322 {
2323         struct nfs4_exception exception = { };
2324         int err;
2325         do {
2326                 err = nfs4_handle_exception(NFS_SERVER(dir),
2327                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2328                                 &exception);
2329         } while (exception.retry);
2330         return err;
2331 }
2332
2333 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2334 {
2335         struct nfs_server *server = NFS_SERVER(inode);
2336         struct nfs4_accessargs args = {
2337                 .fh = NFS_FH(inode),
2338                 .bitmask = server->attr_bitmask,
2339         };
2340         struct nfs4_accessres res = {
2341                 .server = server,
2342         };
2343         struct rpc_message msg = {
2344                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2345                 .rpc_argp = &args,
2346                 .rpc_resp = &res,
2347                 .rpc_cred = entry->cred,
2348         };
2349         int mode = entry->mask;
2350         int status;
2351
2352         /*
2353          * Determine which access bits we want to ask for...
2354          */
2355         if (mode & MAY_READ)
2356                 args.access |= NFS4_ACCESS_READ;
2357         if (S_ISDIR(inode->i_mode)) {
2358                 if (mode & MAY_WRITE)
2359                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2360                 if (mode & MAY_EXEC)
2361                         args.access |= NFS4_ACCESS_LOOKUP;
2362         } else {
2363                 if (mode & MAY_WRITE)
2364                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2365                 if (mode & MAY_EXEC)
2366                         args.access |= NFS4_ACCESS_EXECUTE;
2367         }
2368
2369         res.fattr = nfs_alloc_fattr();
2370         if (res.fattr == NULL)
2371                 return -ENOMEM;
2372
2373         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2374         if (!status) {
2375                 entry->mask = 0;
2376                 if (res.access & NFS4_ACCESS_READ)
2377                         entry->mask |= MAY_READ;
2378                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2379                         entry->mask |= MAY_WRITE;
2380                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2381                         entry->mask |= MAY_EXEC;
2382                 nfs_refresh_inode(inode, res.fattr);
2383         }
2384         nfs_free_fattr(res.fattr);
2385         return status;
2386 }
2387
2388 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2389 {
2390         struct nfs4_exception exception = { };
2391         int err;
2392         do {
2393                 err = nfs4_handle_exception(NFS_SERVER(inode),
2394                                 _nfs4_proc_access(inode, entry),
2395                                 &exception);
2396         } while (exception.retry);
2397         return err;
2398 }
2399
2400 /*
2401  * TODO: For the time being, we don't try to get any attributes
2402  * along with any of the zero-copy operations READ, READDIR,
2403  * READLINK, WRITE.
2404  *
2405  * In the case of the first three, we want to put the GETATTR
2406  * after the read-type operation -- this is because it is hard
2407  * to predict the length of a GETATTR response in v4, and thus
2408  * align the READ data correctly.  This means that the GETATTR
2409  * may end up partially falling into the page cache, and we should
2410  * shift it into the 'tail' of the xdr_buf before processing.
2411  * To do this efficiently, we need to know the total length
2412  * of data received, which doesn't seem to be available outside
2413  * of the RPC layer.
2414  *
2415  * In the case of WRITE, we also want to put the GETATTR after
2416  * the operation -- in this case because we want to make sure
2417  * we get the post-operation mtime and size.  This means that
2418  * we can't use xdr_encode_pages() as written: we need a variant
2419  * of it which would leave room in the 'tail' iovec.
2420  *
2421  * Both of these changes to the XDR layer would in fact be quite
2422  * minor, but I decided to leave them for a subsequent patch.
2423  */
2424 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2425                 unsigned int pgbase, unsigned int pglen)
2426 {
2427         struct nfs4_readlink args = {
2428                 .fh       = NFS_FH(inode),
2429                 .pgbase   = pgbase,
2430                 .pglen    = pglen,
2431                 .pages    = &page,
2432         };
2433         struct nfs4_readlink_res res;
2434         struct rpc_message msg = {
2435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2436                 .rpc_argp = &args,
2437                 .rpc_resp = &res,
2438         };
2439
2440         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2441 }
2442
2443 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2444                 unsigned int pgbase, unsigned int pglen)
2445 {
2446         struct nfs4_exception exception = { };
2447         int err;
2448         do {
2449                 err = nfs4_handle_exception(NFS_SERVER(inode),
2450                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2451                                 &exception);
2452         } while (exception.retry);
2453         return err;
2454 }
2455
2456 /*
2457  * Got race?
2458  * We will need to arrange for the VFS layer to provide an atomic open.
2459  * Until then, this create/open method is prone to inefficiency and race
2460  * conditions due to the lookup, create, and open VFS calls from sys_open()
2461  * placed on the wire.
2462  *
2463  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2464  * The file will be opened again in the subsequent VFS open call
2465  * (nfs4_proc_file_open).
2466  *
2467  * The open for read will just hang around to be used by any process that
2468  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2469  */
2470
2471 static int
2472 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2473                  int flags, struct nfs_open_context *ctx)
2474 {
2475         struct path my_path = {
2476                 .dentry = dentry,
2477         };
2478         struct path *path = &my_path;
2479         struct nfs4_state *state;
2480         struct rpc_cred *cred = NULL;
2481         fmode_t fmode = 0;
2482         int status = 0;
2483
2484         if (ctx != NULL) {
2485                 cred = ctx->cred;
2486                 path = &ctx->path;
2487                 fmode = ctx->mode;
2488         }
2489         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2490         d_drop(dentry);
2491         if (IS_ERR(state)) {
2492                 status = PTR_ERR(state);
2493                 goto out;
2494         }
2495         d_add(dentry, igrab(state->inode));
2496         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2497         if (ctx != NULL)
2498                 ctx->state = state;
2499         else
2500                 nfs4_close_sync(path, state, fmode);
2501 out:
2502         return status;
2503 }
2504
2505 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2506 {
2507         struct nfs_server *server = NFS_SERVER(dir);
2508         struct nfs_removeargs args = {
2509                 .fh = NFS_FH(dir),
2510                 .name.len = name->len,
2511                 .name.name = name->name,
2512                 .bitmask = server->attr_bitmask,
2513         };
2514         struct nfs_removeres res = {
2515                 .server = server,
2516         };
2517         struct rpc_message msg = {
2518                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2519                 .rpc_argp = &args,
2520                 .rpc_resp = &res,
2521         };
2522         int status = -ENOMEM;
2523
2524         res.dir_attr = nfs_alloc_fattr();
2525         if (res.dir_attr == NULL)
2526                 goto out;
2527
2528         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2529         if (status == 0) {
2530                 update_changeattr(dir, &res.cinfo);
2531                 nfs_post_op_update_inode(dir, res.dir_attr);
2532         }
2533         nfs_free_fattr(res.dir_attr);
2534 out:
2535         return status;
2536 }
2537
2538 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2539 {
2540         struct nfs4_exception exception = { };
2541         int err;
2542         do {
2543                 err = nfs4_handle_exception(NFS_SERVER(dir),
2544                                 _nfs4_proc_remove(dir, name),
2545                                 &exception);
2546         } while (exception.retry);
2547         return err;
2548 }
2549
2550 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2551 {
2552         struct nfs_server *server = NFS_SERVER(dir);
2553         struct nfs_removeargs *args = msg->rpc_argp;
2554         struct nfs_removeres *res = msg->rpc_resp;
2555
2556         args->bitmask = server->cache_consistency_bitmask;
2557         res->server = server;
2558         res->seq_res.sr_slot = NULL;
2559         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2560 }
2561
2562 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2563 {
2564         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2565
2566         if (!nfs4_sequence_done(task, &res->seq_res))
2567                 return 0;
2568         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2569                 return 0;
2570         update_changeattr(dir, &res->cinfo);
2571         nfs_post_op_update_inode(dir, res->dir_attr);
2572         return 1;
2573 }
2574
2575 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2576 {
2577         struct nfs_server *server = NFS_SERVER(dir);
2578         struct nfs_renameargs *arg = msg->rpc_argp;
2579         struct nfs_renameres *res = msg->rpc_resp;
2580
2581         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2582         arg->bitmask = server->attr_bitmask;
2583         res->server = server;
2584 }
2585
2586 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2587                                  struct inode *new_dir)
2588 {
2589         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2590
2591         if (!nfs4_sequence_done(task, &res->seq_res))
2592                 return 0;
2593         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2594                 return 0;
2595
2596         update_changeattr(old_dir, &res->old_cinfo);
2597         nfs_post_op_update_inode(old_dir, res->old_fattr);
2598         update_changeattr(new_dir, &res->new_cinfo);
2599         nfs_post_op_update_inode(new_dir, res->new_fattr);
2600         return 1;
2601 }
2602
2603 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2604                 struct inode *new_dir, struct qstr *new_name)
2605 {
2606         struct nfs_server *server = NFS_SERVER(old_dir);
2607         struct nfs_renameargs arg = {
2608                 .old_dir = NFS_FH(old_dir),
2609                 .new_dir = NFS_FH(new_dir),
2610                 .old_name = old_name,
2611                 .new_name = new_name,
2612                 .bitmask = server->attr_bitmask,
2613         };
2614         struct nfs_renameres res = {
2615                 .server = server,
2616         };
2617         struct rpc_message msg = {
2618                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2619                 .rpc_argp = &arg,
2620                 .rpc_resp = &res,
2621         };
2622         int status = -ENOMEM;
2623
2624         res.old_fattr = nfs_alloc_fattr();
2625         res.new_fattr = nfs_alloc_fattr();
2626         if (res.old_fattr == NULL || res.new_fattr == NULL)
2627                 goto out;
2628
2629         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2630         if (!status) {
2631                 update_changeattr(old_dir, &res.old_cinfo);
2632                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2633                 update_changeattr(new_dir, &res.new_cinfo);
2634                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2635         }
2636 out:
2637         nfs_free_fattr(res.new_fattr);
2638         nfs_free_fattr(res.old_fattr);
2639         return status;
2640 }
2641
2642 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2643                 struct inode *new_dir, struct qstr *new_name)
2644 {
2645         struct nfs4_exception exception = { };
2646         int err;
2647         do {
2648                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2649                                 _nfs4_proc_rename(old_dir, old_name,
2650                                         new_dir, new_name),
2651                                 &exception);
2652         } while (exception.retry);
2653         return err;
2654 }
2655
2656 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2657 {
2658         struct nfs_server *server = NFS_SERVER(inode);
2659         struct nfs4_link_arg arg = {
2660                 .fh     = NFS_FH(inode),
2661                 .dir_fh = NFS_FH(dir),
2662                 .name   = name,
2663                 .bitmask = server->attr_bitmask,
2664         };
2665         struct nfs4_link_res res = {
2666                 .server = server,
2667         };
2668         struct rpc_message msg = {
2669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2670                 .rpc_argp = &arg,
2671                 .rpc_resp = &res,
2672         };
2673         int status = -ENOMEM;
2674
2675         res.fattr = nfs_alloc_fattr();
2676         res.dir_attr = nfs_alloc_fattr();
2677         if (res.fattr == NULL || res.dir_attr == NULL)
2678                 goto out;
2679
2680         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2681         if (!status) {
2682                 update_changeattr(dir, &res.cinfo);
2683                 nfs_post_op_update_inode(dir, res.dir_attr);
2684                 nfs_post_op_update_inode(inode, res.fattr);
2685         }
2686 out:
2687         nfs_free_fattr(res.dir_attr);
2688         nfs_free_fattr(res.fattr);
2689         return status;
2690 }
2691
2692 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2693 {
2694         struct nfs4_exception exception = { };
2695         int err;
2696         do {
2697                 err = nfs4_handle_exception(NFS_SERVER(inode),
2698                                 _nfs4_proc_link(inode, dir, name),
2699                                 &exception);
2700         } while (exception.retry);
2701         return err;
2702 }
2703
2704 struct nfs4_createdata {
2705         struct rpc_message msg;
2706         struct nfs4_create_arg arg;
2707         struct nfs4_create_res res;
2708         struct nfs_fh fh;
2709         struct nfs_fattr fattr;
2710         struct nfs_fattr dir_fattr;
2711 };
2712
2713 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2714                 struct qstr *name, struct iattr *sattr, u32 ftype)
2715 {
2716         struct nfs4_createdata *data;
2717
2718         data = kzalloc(sizeof(*data), GFP_KERNEL);
2719         if (data != NULL) {
2720                 struct nfs_server *server = NFS_SERVER(dir);
2721
2722                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2723                 data->msg.rpc_argp = &data->arg;
2724                 data->msg.rpc_resp = &data->res;
2725                 data->arg.dir_fh = NFS_FH(dir);
2726                 data->arg.server = server;
2727                 data->arg.name = name;
2728                 data->arg.attrs = sattr;
2729                 data->arg.ftype = ftype;
2730                 data->arg.bitmask = server->attr_bitmask;
2731                 data->res.server = server;
2732                 data->res.fh = &data->fh;
2733                 data->res.fattr = &data->fattr;
2734                 data->res.dir_fattr = &data->dir_fattr;
2735                 nfs_fattr_init(data->res.fattr);
2736                 nfs_fattr_init(data->res.dir_fattr);
2737         }
2738         return data;
2739 }
2740
2741 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2742 {
2743         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2744                                     &data->arg, &data->res, 1);
2745         if (status == 0) {
2746                 update_changeattr(dir, &data->res.dir_cinfo);
2747                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2748                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2749         }
2750         return status;
2751 }
2752
2753 static void nfs4_free_createdata(struct nfs4_createdata *data)
2754 {
2755         kfree(data);
2756 }
2757
2758 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2759                 struct page *page, unsigned int len, struct iattr *sattr)
2760 {
2761         struct nfs4_createdata *data;
2762         int status = -ENAMETOOLONG;
2763
2764         if (len > NFS4_MAXPATHLEN)
2765                 goto out;
2766
2767         status = -ENOMEM;
2768         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2769         if (data == NULL)
2770                 goto out;
2771
2772         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2773         data->arg.u.symlink.pages = &page;
2774         data->arg.u.symlink.len = len;
2775
2776         status = nfs4_do_create(dir, dentry, data);
2777
2778         nfs4_free_createdata(data);
2779 out:
2780         return status;
2781 }
2782
2783 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2784                 struct page *page, unsigned int len, struct iattr *sattr)
2785 {
2786         struct nfs4_exception exception = { };
2787         int err;
2788         do {
2789                 err = nfs4_handle_exception(NFS_SERVER(dir),
2790                                 _nfs4_proc_symlink(dir, dentry, page,
2791                                                         len, sattr),
2792                                 &exception);
2793         } while (exception.retry);
2794         return err;
2795 }
2796
2797 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2798                 struct iattr *sattr)
2799 {
2800         struct nfs4_createdata *data;
2801         int status = -ENOMEM;
2802
2803         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2804         if (data == NULL)
2805                 goto out;
2806
2807         status = nfs4_do_create(dir, dentry, data);
2808
2809         nfs4_free_createdata(data);
2810 out:
2811         return status;
2812 }
2813
2814 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2815                 struct iattr *sattr)
2816 {
2817         struct nfs4_exception exception = { };
2818         int err;
2819         do {
2820                 err = nfs4_handle_exception(NFS_SERVER(dir),
2821                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2822                                 &exception);
2823         } while (exception.retry);
2824         return err;
2825 }
2826
2827 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2828                 u64 cookie, struct page **pages, unsigned int count, int plus)
2829 {
2830         struct inode            *dir = dentry->d_inode;
2831         struct nfs4_readdir_arg args = {
2832                 .fh = NFS_FH(dir),
2833                 .pages = pages,
2834                 .pgbase = 0,
2835                 .count = count,
2836                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2837                 .plus = plus,
2838         };
2839         struct nfs4_readdir_res res;
2840         struct rpc_message msg = {
2841                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2842                 .rpc_argp = &args,
2843                 .rpc_resp = &res,
2844                 .rpc_cred = cred,
2845         };
2846         int                     status;
2847
2848         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2849                         dentry->d_parent->d_name.name,
2850                         dentry->d_name.name,
2851                         (unsigned long long)cookie);
2852         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2853         res.pgbase = args.pgbase;
2854         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2855         if (status == 0)
2856                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2857
2858         nfs_invalidate_atime(dir);
2859
2860         dprintk("%s: returns %d\n", __func__, status);
2861         return status;
2862 }
2863
2864 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2865                 u64 cookie, struct page **pages, unsigned int count, int plus)
2866 {
2867         struct nfs4_exception exception = { };
2868         int err;
2869         do {
2870                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2871                                 _nfs4_proc_readdir(dentry, cred, cookie,
2872                                         pages, count, plus),
2873                                 &exception);
2874         } while (exception.retry);
2875         return err;
2876 }
2877
2878 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2879                 struct iattr *sattr, dev_t rdev)
2880 {
2881         struct nfs4_createdata *data;
2882         int mode = sattr->ia_mode;
2883         int status = -ENOMEM;
2884
2885         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2886         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2887
2888         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2889         if (data == NULL)
2890                 goto out;
2891
2892         if (S_ISFIFO(mode))
2893                 data->arg.ftype = NF4FIFO;
2894         else if (S_ISBLK(mode)) {
2895                 data->arg.ftype = NF4BLK;
2896                 data->arg.u.device.specdata1 = MAJOR(rdev);
2897                 data->arg.u.device.specdata2 = MINOR(rdev);
2898         }
2899         else if (S_ISCHR(mode)) {
2900                 data->arg.ftype = NF4CHR;
2901                 data->arg.u.device.specdata1 = MAJOR(rdev);
2902                 data->arg.u.device.specdata2 = MINOR(rdev);
2903         }
2904
2905         status = nfs4_do_create(dir, dentry, data);
2906
2907         nfs4_free_createdata(data);
2908 out:
2909         return status;
2910 }
2911
2912 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2913                 struct iattr *sattr, dev_t rdev)
2914 {
2915         struct nfs4_exception exception = { };
2916         int err;
2917         do {
2918                 err = nfs4_handle_exception(NFS_SERVER(dir),
2919                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2920                                 &exception);
2921         } while (exception.retry);
2922         return err;
2923 }
2924
2925 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2926                  struct nfs_fsstat *fsstat)
2927 {
2928         struct nfs4_statfs_arg args = {
2929                 .fh = fhandle,
2930                 .bitmask = server->attr_bitmask,
2931         };
2932         struct nfs4_statfs_res res = {
2933                 .fsstat = fsstat,
2934         };
2935         struct rpc_message msg = {
2936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2937                 .rpc_argp = &args,
2938                 .rpc_resp = &res,
2939         };
2940
2941         nfs_fattr_init(fsstat->fattr);
2942         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2943 }
2944
2945 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2946 {
2947         struct nfs4_exception exception = { };
2948         int err;
2949         do {
2950                 err = nfs4_handle_exception(server,
2951                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2952                                 &exception);
2953         } while (exception.retry);
2954         return err;
2955 }
2956
2957 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2958                 struct nfs_fsinfo *fsinfo)
2959 {
2960         struct nfs4_fsinfo_arg args = {
2961                 .fh = fhandle,
2962                 .bitmask = server->attr_bitmask,
2963         };
2964         struct nfs4_fsinfo_res res = {
2965                 .fsinfo = fsinfo,
2966         };
2967         struct rpc_message msg = {
2968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2969                 .rpc_argp = &args,
2970                 .rpc_resp = &res,
2971         };
2972
2973         return nfs4_call_sync(server, &msg, &args, &res, 0);
2974 }
2975
2976 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2977 {
2978         struct nfs4_exception exception = { };
2979         int err;
2980
2981         do {
2982                 err = nfs4_handle_exception(server,
2983                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2984                                 &exception);
2985         } while (exception.retry);
2986         return err;
2987 }
2988
2989 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2990 {
2991         nfs_fattr_init(fsinfo->fattr);
2992         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2993 }
2994
2995 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2996                 struct nfs_pathconf *pathconf)
2997 {
2998         struct nfs4_pathconf_arg args = {
2999                 .fh = fhandle,
3000                 .bitmask = server->attr_bitmask,
3001         };
3002         struct nfs4_pathconf_res res = {
3003                 .pathconf = pathconf,
3004         };
3005         struct rpc_message msg = {
3006                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3007                 .rpc_argp = &args,
3008                 .rpc_resp = &res,
3009         };
3010
3011         /* None of the pathconf attributes are mandatory to implement */
3012         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3013                 memset(pathconf, 0, sizeof(*pathconf));
3014                 return 0;
3015         }
3016
3017         nfs_fattr_init(pathconf->fattr);
3018         return nfs4_call_sync(server, &msg, &args, &res, 0);
3019 }
3020
3021 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3022                 struct nfs_pathconf *pathconf)
3023 {
3024         struct nfs4_exception exception = { };
3025         int err;
3026
3027         do {
3028                 err = nfs4_handle_exception(server,
3029                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3030                                 &exception);
3031         } while (exception.retry);
3032         return err;
3033 }
3034
3035 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3036 {
3037         struct nfs_server *server = NFS_SERVER(data->inode);
3038
3039         dprintk("--> %s\n", __func__);
3040
3041         if (!nfs4_sequence_done(task, &data->res.seq_res))
3042                 return -EAGAIN;
3043
3044         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3045                 nfs_restart_rpc(task, server->nfs_client);
3046                 return -EAGAIN;
3047         }
3048
3049         nfs_invalidate_atime(data->inode);
3050         if (task->tk_status > 0)
3051                 renew_lease(server, data->timestamp);
3052         return 0;
3053 }
3054
3055 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3056 {
3057         data->timestamp   = jiffies;
3058         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3059 }
3060
3061 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3062 {
3063         struct inode *inode = data->inode;
3064
3065         if (!nfs4_sequence_done(task, &data->res.seq_res))
3066                 return -EAGAIN;
3067
3068         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3069                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3070                 return -EAGAIN;
3071         }
3072         if (task->tk_status >= 0) {
3073                 renew_lease(NFS_SERVER(inode), data->timestamp);
3074                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3075         }
3076         return 0;
3077 }
3078
3079 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3080 {
3081         struct nfs_server *server = NFS_SERVER(data->inode);
3082
3083         data->args.bitmask = server->cache_consistency_bitmask;
3084         data->res.server = server;
3085         data->timestamp   = jiffies;
3086
3087         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3088 }
3089
3090 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3091 {
3092         struct inode *inode = data->inode;
3093
3094         if (!nfs4_sequence_done(task, &data->res.seq_res))
3095                 return -EAGAIN;
3096
3097         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3098                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3099                 return -EAGAIN;
3100         }
3101         nfs_refresh_inode(inode, data->res.fattr);
3102         return 0;
3103 }
3104
3105 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3106 {
3107         struct nfs_server *server = NFS_SERVER(data->inode);
3108
3109         data->args.bitmask = server->cache_consistency_bitmask;
3110         data->res.server = server;
3111         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3112 }
3113
3114 struct nfs4_renewdata {
3115         struct nfs_client       *client;
3116         unsigned long           timestamp;
3117 };
3118
3119 /*
3120  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3121  * standalone procedure for queueing an asynchronous RENEW.
3122  */
3123 static void nfs4_renew_release(void *calldata)
3124 {
3125         struct nfs4_renewdata *data = calldata;
3126         struct nfs_client *clp = data->client;
3127
3128         if (atomic_read(&clp->cl_count) > 1)
3129                 nfs4_schedule_state_renewal(clp);
3130         nfs_put_client(clp);
3131         kfree(data);
3132 }
3133
3134 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3135 {
3136         struct nfs4_renewdata *data = calldata;
3137         struct nfs_client *clp = data->client;
3138         unsigned long timestamp = data->timestamp;
3139
3140         if (task->tk_status < 0) {
3141                 /* Unless we're shutting down, schedule state recovery! */
3142                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3143                         nfs4_schedule_state_recovery(clp);
3144                 return;
3145         }
3146         do_renew_lease(clp, timestamp);
3147 }
3148
3149 static const struct rpc_call_ops nfs4_renew_ops = {
3150         .rpc_call_done = nfs4_renew_done,
3151         .rpc_release = nfs4_renew_release,
3152 };
3153
3154 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3155 {
3156         struct rpc_message msg = {
3157                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3158                 .rpc_argp       = clp,
3159                 .rpc_cred       = cred,
3160         };
3161         struct nfs4_renewdata *data;
3162
3163         if (!atomic_inc_not_zero(&clp->cl_count))
3164                 return -EIO;
3165         data = kmalloc(sizeof(*data), GFP_KERNEL);
3166         if (data == NULL)
3167                 return -ENOMEM;
3168         data->client = clp;
3169         data->timestamp = jiffies;
3170         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3171                         &nfs4_renew_ops, data);
3172 }
3173
3174 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3175 {
3176         struct rpc_message msg = {
3177                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3178                 .rpc_argp       = clp,
3179                 .rpc_cred       = cred,
3180         };
3181         unsigned long now = jiffies;
3182         int status;
3183
3184         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3185         if (status < 0)
3186                 return status;
3187         do_renew_lease(clp, now);
3188         return 0;
3189 }
3190
3191 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3192 {
3193         return (server->caps & NFS_CAP_ACLS)
3194                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3195                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3196 }
3197
3198 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3199  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3200  * the stack.
3201  */
3202 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3203
3204 static void buf_to_pages(const void *buf, size_t buflen,
3205                 struct page **pages, unsigned int *pgbase)
3206 {
3207         const void *p = buf;
3208
3209         *pgbase = offset_in_page(buf);
3210         p -= *pgbase;
3211         while (p < buf + buflen) {
3212                 *(pages++) = virt_to_page(p);
3213                 p += PAGE_CACHE_SIZE;
3214         }
3215 }
3216
3217 struct nfs4_cached_acl {
3218         int cached;
3219         size_t len;
3220         char data[0];
3221 };
3222
3223 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3224 {
3225         struct nfs_inode *nfsi = NFS_I(inode);
3226
3227         spin_lock(&inode->i_lock);
3228         kfree(nfsi->nfs4_acl);
3229         nfsi->nfs4_acl = acl;
3230         spin_unlock(&inode->i_lock);
3231 }
3232
3233 static void nfs4_zap_acl_attr(struct inode *inode)
3234 {
3235         nfs4_set_cached_acl(inode, NULL);
3236 }
3237
3238 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3239 {
3240         struct nfs_inode *nfsi = NFS_I(inode);
3241         struct nfs4_cached_acl *acl;
3242         int ret = -ENOENT;
3243
3244         spin_lock(&inode->i_lock);
3245         acl = nfsi->nfs4_acl;
3246         if (acl == NULL)
3247                 goto out;
3248         if (buf == NULL) /* user is just asking for length */
3249                 goto out_len;
3250         if (acl->cached == 0)
3251                 goto out;
3252         ret = -ERANGE; /* see getxattr(2) man page */
3253         if (acl->len > buflen)
3254                 goto out;
3255         memcpy(buf, acl->data, acl->len);
3256 out_len:
3257         ret = acl->len;
3258 out:
3259         spin_unlock(&inode->i_lock);
3260         return ret;
3261 }
3262
3263 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3264 {
3265         struct nfs4_cached_acl *acl;
3266
3267         if (buf && acl_len <= PAGE_SIZE) {
3268                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3269                 if (acl == NULL)
3270                         goto out;
3271                 acl->cached = 1;
3272                 memcpy(acl->data, buf, acl_len);
3273         } else {
3274                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3275                 if (acl == NULL)
3276                         goto out;
3277                 acl->cached = 0;
3278         }
3279         acl->len = acl_len;
3280 out:
3281         nfs4_set_cached_acl(inode, acl);
3282 }
3283
3284 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3285 {
3286         struct page *pages[NFS4ACL_MAXPAGES];
3287         struct nfs_getaclargs args = {
3288                 .fh = NFS_FH(inode),
3289                 .acl_pages = pages,
3290                 .acl_len = buflen,
3291         };
3292         struct nfs_getaclres res = {
3293                 .acl_len = buflen,
3294         };
3295         void *resp_buf;
3296         struct rpc_message msg = {
3297                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3298                 .rpc_argp = &args,
3299                 .rpc_resp = &res,
3300         };
3301         struct page *localpage = NULL;
3302         int ret;
3303
3304         if (buflen < PAGE_SIZE) {
3305                 /* As long as we're doing a round trip to the server anyway,
3306                  * let's be prepared for a page of acl data. */
3307                 localpage = alloc_page(GFP_KERNEL);
3308                 resp_buf = page_address(localpage);
3309                 if (localpage == NULL)
3310                         return -ENOMEM;
3311                 args.acl_pages[0] = localpage;
3312                 args.acl_pgbase = 0;
3313                 args.acl_len = PAGE_SIZE;
3314         } else {
3315                 resp_buf = buf;
3316                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3317         }
3318         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3319         if (ret)
3320                 goto out_free;
3321         if (res.acl_len > args.acl_len)
3322                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3323         else
3324                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3325         if (buf) {
3326                 ret = -ERANGE;
3327                 if (res.acl_len > buflen)
3328                         goto out_free;
3329                 if (localpage)
3330                         memcpy(buf, resp_buf, res.acl_len);
3331         }
3332         ret = res.acl_len;
3333 out_free:
3334         if (localpage)
3335                 __free_page(localpage);
3336         return ret;
3337 }
3338
3339 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3340 {
3341         struct nfs4_exception exception = { };
3342         ssize_t ret;
3343         do {
3344                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3345                 if (ret >= 0)
3346                         break;
3347                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3348         } while (exception.retry);
3349         return ret;
3350 }
3351
3352 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3353 {
3354         struct nfs_server *server = NFS_SERVER(inode);
3355         int ret;
3356
3357         if (!nfs4_server_supports_acls(server))
3358                 return -EOPNOTSUPP;
3359         ret = nfs_revalidate_inode(server, inode);
3360         if (ret < 0)
3361                 return ret;
3362         ret = nfs4_read_cached_acl(inode, buf, buflen);
3363         if (ret != -ENOENT)
3364                 return ret;
3365         return nfs4_get_acl_uncached(inode, buf, buflen);
3366 }
3367
3368 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3369 {
3370         struct nfs_server *server = NFS_SERVER(inode);
3371         struct page *pages[NFS4ACL_MAXPAGES];
3372         struct nfs_setaclargs arg = {
3373                 .fh             = NFS_FH(inode),
3374                 .acl_pages      = pages,
3375                 .acl_len        = buflen,
3376         };
3377         struct nfs_setaclres res;
3378         struct rpc_message msg = {
3379                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3380                 .rpc_argp       = &arg,
3381                 .rpc_resp       = &res,
3382         };
3383         int ret;
3384
3385         if (!nfs4_server_supports_acls(server))
3386                 return -EOPNOTSUPP;
3387         nfs_inode_return_delegation(inode);
3388         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3389         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3390         nfs_access_zap_cache(inode);
3391         nfs_zap_acl_cache(inode);
3392         return ret;
3393 }
3394
3395 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3396 {
3397         struct nfs4_exception exception = { };
3398         int err;
3399         do {
3400                 err = nfs4_handle_exception(NFS_SERVER(inode),
3401                                 __nfs4_proc_set_acl(inode, buf, buflen),
3402                                 &exception);
3403         } while (exception.retry);
3404         return err;
3405 }
3406
3407 static int
3408 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3409 {
3410         struct nfs_client *clp = server->nfs_client;
3411
3412         if (task->tk_status >= 0)
3413                 return 0;
3414         switch(task->tk_status) {
3415                 case -NFS4ERR_ADMIN_REVOKED:
3416                 case -NFS4ERR_BAD_STATEID:
3417                 case -NFS4ERR_OPENMODE:
3418                         if (state == NULL)
3419                                 break;
3420                         nfs4_state_mark_reclaim_nograce(clp, state);
3421                         goto do_state_recovery;
3422                 case -NFS4ERR_STALE_STATEID:
3423                 case -NFS4ERR_STALE_CLIENTID:
3424                 case -NFS4ERR_EXPIRED:
3425                         goto do_state_recovery;
3426 #if defined(CONFIG_NFS_V4_1)
3427                 case -NFS4ERR_BADSESSION:
3428                 case -NFS4ERR_BADSLOT:
3429                 case -NFS4ERR_BAD_HIGH_SLOT:
3430                 case -NFS4ERR_DEADSESSION:
3431                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3432                 case -NFS4ERR_SEQ_FALSE_RETRY:
3433                 case -NFS4ERR_SEQ_MISORDERED:
3434                         dprintk("%s ERROR %d, Reset session\n", __func__,
3435                                 task->tk_status);
3436                         nfs4_schedule_state_recovery(clp);
3437                         task->tk_status = 0;
3438                         return -EAGAIN;
3439 #endif /* CONFIG_NFS_V4_1 */
3440                 case -NFS4ERR_DELAY:
3441                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3442                 case -NFS4ERR_GRACE:
3443                 case -EKEYEXPIRED:
3444                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3445                         task->tk_status = 0;
3446                         return -EAGAIN;
3447                 case -NFS4ERR_OLD_STATEID:
3448                         task->tk_status = 0;
3449                         return -EAGAIN;
3450         }
3451         task->tk_status = nfs4_map_errors(task->tk_status);
3452         return 0;
3453 do_state_recovery:
3454         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3455         nfs4_schedule_state_recovery(clp);
3456         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3457                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3458         task->tk_status = 0;
3459         return -EAGAIN;
3460 }
3461
3462 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3463                 unsigned short port, struct rpc_cred *cred,
3464                 struct nfs4_setclientid_res *res)
3465 {
3466         nfs4_verifier sc_verifier;
3467         struct nfs4_setclientid setclientid = {
3468                 .sc_verifier = &sc_verifier,
3469                 .sc_prog = program,
3470         };
3471         struct rpc_message msg = {
3472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3473                 .rpc_argp = &setclientid,
3474                 .rpc_resp = res,
3475                 .rpc_cred = cred,
3476         };
3477         __be32 *p;
3478         int loop = 0;
3479         int status;
3480
3481         p = (__be32*)sc_verifier.data;
3482         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3483         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3484
3485         for(;;) {
3486                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3487                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3488                                 clp->cl_ipaddr,
3489                                 rpc_peeraddr2str(clp->cl_rpcclient,
3490                                                         RPC_DISPLAY_ADDR),
3491                                 rpc_peeraddr2str(clp->cl_rpcclient,
3492                                                         RPC_DISPLAY_PROTO),
3493                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3494                                 clp->cl_id_uniquifier);
3495                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3496                                 sizeof(setclientid.sc_netid),
3497                                 rpc_peeraddr2str(clp->cl_rpcclient,
3498                                                         RPC_DISPLAY_NETID));
3499                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3500                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3501                                 clp->cl_ipaddr, port >> 8, port & 255);
3502
3503                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3504                 if (status != -NFS4ERR_CLID_INUSE)
3505                         break;
3506                 if (signalled())
3507                         break;
3508                 if (loop++ & 1)
3509                         ssleep(clp->cl_lease_time + 1);
3510                 else
3511                         if (++clp->cl_id_uniquifier == 0)
3512                                 break;
3513         }
3514         return status;
3515 }
3516
3517 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3518                 struct nfs4_setclientid_res *arg,
3519                 struct rpc_cred *cred)
3520 {
3521         struct nfs_fsinfo fsinfo;
3522         struct rpc_message msg = {
3523                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3524                 .rpc_argp = arg,
3525                 .rpc_resp = &fsinfo,
3526                 .rpc_cred = cred,
3527         };
3528         unsigned long now;
3529         int status;
3530
3531         now = jiffies;
3532         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3533         if (status == 0) {
3534                 spin_lock(&clp->cl_lock);
3535                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3536                 clp->cl_last_renewal = now;
3537                 spin_unlock(&clp->cl_lock);
3538         }
3539         return status;
3540 }
3541
3542 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3543                 struct nfs4_setclientid_res *arg,
3544                 struct rpc_cred *cred)
3545 {
3546         long timeout = 0;
3547         int err;
3548         do {
3549                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3550                 switch (err) {
3551                         case 0:
3552                                 return err;
3553                         case -NFS4ERR_RESOURCE:
3554                                 /* The IBM lawyers misread another document! */
3555                         case -NFS4ERR_DELAY:
3556                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3557                 }
3558         } while (err == 0);
3559         return err;
3560 }
3561
3562 struct nfs4_delegreturndata {
3563         struct nfs4_delegreturnargs args;
3564         struct nfs4_delegreturnres res;
3565         struct nfs_fh fh;
3566         nfs4_stateid stateid;
3567         unsigned long timestamp;
3568         struct nfs_fattr fattr;
3569         int rpc_status;
3570 };
3571
3572 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3573 {
3574         struct nfs4_delegreturndata *data = calldata;
3575
3576         if (!nfs4_sequence_done(task, &data->res.seq_res))
3577                 return;
3578
3579         switch (task->tk_status) {
3580         case -NFS4ERR_STALE_STATEID:
3581         case -NFS4ERR_EXPIRED:
3582         case 0:
3583                 renew_lease(data->res.server, data->timestamp);
3584                 break;
3585         default:
3586                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3587                                 -EAGAIN) {
3588                         nfs_restart_rpc(task, data->res.server->nfs_client);
3589                         return;
3590                 }
3591         }
3592         data->rpc_status = task->tk_status;
3593 }
3594
3595 static void nfs4_delegreturn_release(void *calldata)
3596 {
3597         kfree(calldata);
3598 }
3599
3600 #if defined(CONFIG_NFS_V4_1)
3601 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3602 {
3603         struct nfs4_delegreturndata *d_data;
3604
3605         d_data = (struct nfs4_delegreturndata *)data;
3606
3607         if (nfs4_setup_sequence(d_data->res.server,
3608                                 &d_data->args.seq_args,
3609                                 &d_data->res.seq_res, 1, task))
3610                 return;
3611         rpc_call_start(task);
3612 }
3613 #endif /* CONFIG_NFS_V4_1 */
3614
3615 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3616 #if defined(CONFIG_NFS_V4_1)
3617         .rpc_call_prepare = nfs4_delegreturn_prepare,
3618 #endif /* CONFIG_NFS_V4_1 */
3619         .rpc_call_done = nfs4_delegreturn_done,
3620         .rpc_release = nfs4_delegreturn_release,
3621 };
3622
3623 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3624 {
3625         struct nfs4_delegreturndata *data;
3626         struct nfs_server *server = NFS_SERVER(inode);
3627         struct rpc_task *task;
3628         struct rpc_message msg = {
3629                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3630                 .rpc_cred = cred,
3631         };
3632         struct rpc_task_setup task_setup_data = {
3633                 .rpc_client = server->client,
3634                 .rpc_message = &msg,
3635                 .callback_ops = &nfs4_delegreturn_ops,
3636                 .flags = RPC_TASK_ASYNC,
3637         };
3638         int status = 0;
3639
3640         data = kzalloc(sizeof(*data), GFP_NOFS);
3641         if (data == NULL)
3642                 return -ENOMEM;
3643         data->args.fhandle = &data->fh;
3644         data->args.stateid = &data->stateid;
3645         data->args.bitmask = server->attr_bitmask;
3646         nfs_copy_fh(&data->fh, NFS_FH(inode));
3647         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3648         data->res.fattr = &data->fattr;
3649         data->res.server = server;
3650         nfs_fattr_init(data->res.fattr);
3651         data->timestamp = jiffies;
3652         data->rpc_status = 0;
3653
3654         task_setup_data.callback_data = data;
3655         msg.rpc_argp = &data->args,
3656         msg.rpc_resp = &data->res,
3657         task = rpc_run_task(&task_setup_data);
3658         if (IS_ERR(task))
3659                 return PTR_ERR(task);
3660         if (!issync)
3661                 goto out;
3662         status = nfs4_wait_for_completion_rpc_task(task);
3663         if (status != 0)
3664                 goto out;
3665         status = data->rpc_status;
3666         if (status != 0)
3667                 goto out;
3668         nfs_refresh_inode(inode, &data->fattr);
3669 out:
3670         rpc_put_task(task);
3671         return status;
3672 }
3673
3674 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3675 {
3676         struct nfs_server *server = NFS_SERVER(inode);
3677         struct nfs4_exception exception = { };
3678         int err;
3679         do {
3680                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3681                 switch (err) {
3682                         case -NFS4ERR_STALE_STATEID:
3683                         case -NFS4ERR_EXPIRED:
3684                         case 0:
3685                                 return 0;
3686                 }
3687                 err = nfs4_handle_exception(server, err, &exception);
3688         } while (exception.retry);
3689         return err;
3690 }
3691
3692 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3693 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3694
3695 /*
3696  * sleep, with exponential backoff, and retry the LOCK operation.
3697  */
3698 static unsigned long
3699 nfs4_set_lock_task_retry(unsigned long timeout)
3700 {
3701         schedule_timeout_killable(timeout);
3702         timeout <<= 1;
3703         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3704                 return NFS4_LOCK_MAXTIMEOUT;
3705         return timeout;
3706 }
3707
3708 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3709 {
3710         struct inode *inode = state->inode;
3711         struct nfs_server *server = NFS_SERVER(inode);
3712         struct nfs_client *clp = server->nfs_client;
3713         struct nfs_lockt_args arg = {
3714                 .fh = NFS_FH(inode),
3715                 .fl = request,
3716         };
3717         struct nfs_lockt_res res = {
3718                 .denied = request,
3719         };
3720         struct rpc_message msg = {
3721                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3722                 .rpc_argp       = &arg,
3723                 .rpc_resp       = &res,
3724                 .rpc_cred       = state->owner->so_cred,
3725         };
3726         struct nfs4_lock_state *lsp;
3727         int status;
3728
3729         arg.lock_owner.clientid = clp->cl_clientid;
3730         status = nfs4_set_lock_state(state, request);
3731         if (status != 0)
3732                 goto out;
3733         lsp = request->fl_u.nfs4_fl.owner;
3734         arg.lock_owner.id = lsp->ls_id.id;
3735         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3736         switch (status) {
3737                 case 0:
3738                         request->fl_type = F_UNLCK;
3739                         break;
3740                 case -NFS4ERR_DENIED:
3741                         status = 0;
3742         }
3743         request->fl_ops->fl_release_private(request);
3744 out:
3745         return status;
3746 }
3747
3748 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3749 {
3750         struct nfs4_exception exception = { };
3751         int err;
3752
3753         do {
3754                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3755                                 _nfs4_proc_getlk(state, cmd, request),
3756                                 &exception);
3757         } while (exception.retry);
3758         return err;
3759 }
3760
3761 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3762 {
3763         int res = 0;
3764         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3765                 case FL_POSIX:
3766                         res = posix_lock_file_wait(file, fl);
3767                         break;
3768                 case FL_FLOCK:
3769                         res = flock_lock_file_wait(file, fl);
3770                         break;
3771                 default:
3772                         BUG();
3773         }
3774         return res;
3775 }
3776
3777 struct nfs4_unlockdata {
3778         struct nfs_locku_args arg;
3779         struct nfs_locku_res res;
3780         struct nfs4_lock_state *lsp;
3781         struct nfs_open_context *ctx;
3782         struct file_lock fl;
3783         const struct nfs_server *server;
3784         unsigned long timestamp;
3785 };
3786
3787 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3788                 struct nfs_open_context *ctx,
3789                 struct nfs4_lock_state *lsp,
3790                 struct nfs_seqid *seqid)
3791 {
3792         struct nfs4_unlockdata *p;
3793         struct inode *inode = lsp->ls_state->inode;
3794
3795         p = kzalloc(sizeof(*p), GFP_NOFS);
3796         if (p == NULL)
3797                 return NULL;
3798         p->arg.fh = NFS_FH(inode);
3799         p->arg.fl = &p->fl;
3800         p->arg.seqid = seqid;
3801         p->res.seqid = seqid;
3802         p->arg.stateid = &lsp->ls_stateid;
3803         p->lsp = lsp;
3804         atomic_inc(&lsp->ls_count);
3805         /* Ensure we don't close file until we're done freeing locks! */
3806         p->ctx = get_nfs_open_context(ctx);
3807         memcpy(&p->fl, fl, sizeof(p->fl));
3808         p->server = NFS_SERVER(inode);
3809         return p;
3810 }
3811
3812 static void nfs4_locku_release_calldata(void *data)
3813 {
3814         struct nfs4_unlockdata *calldata = data;
3815         nfs_free_seqid(calldata->arg.seqid);
3816         nfs4_put_lock_state(calldata->lsp);
3817         put_nfs_open_context(calldata->ctx);
3818         kfree(calldata);
3819 }
3820
3821 static void nfs4_locku_done(struct rpc_task *task, void *data)
3822 {
3823         struct nfs4_unlockdata *calldata = data;
3824
3825         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3826                 return;
3827         switch (task->tk_status) {
3828                 case 0:
3829                         memcpy(calldata->lsp->ls_stateid.data,
3830                                         calldata->res.stateid.data,
3831                                         sizeof(calldata->lsp->ls_stateid.data));
3832                         renew_lease(calldata->server, calldata->timestamp);
3833                         break;
3834                 case -NFS4ERR_BAD_STATEID:
3835                 case -NFS4ERR_OLD_STATEID:
3836                 case -NFS4ERR_STALE_STATEID:
3837                 case -NFS4ERR_EXPIRED:
3838                         break;
3839                 default:
3840                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3841                                 nfs_restart_rpc(task,
3842                                                  calldata->server->nfs_client);
3843         }
3844 }
3845
3846 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3847 {
3848         struct nfs4_unlockdata *calldata = data;
3849
3850         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3851                 return;
3852         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3853                 /* Note: exit _without_ running nfs4_locku_done */
3854                 task->tk_action = NULL;
3855                 return;
3856         }
3857         calldata->timestamp = jiffies;
3858         if (nfs4_setup_sequence(calldata->server,
3859                                 &calldata->arg.seq_args,
3860                                 &calldata->res.seq_res, 1, task))
3861                 return;
3862         rpc_call_start(task);
3863 }
3864
3865 static const struct rpc_call_ops nfs4_locku_ops = {
3866         .rpc_call_prepare = nfs4_locku_prepare,
3867         .rpc_call_done = nfs4_locku_done,
3868         .rpc_release = nfs4_locku_release_calldata,
3869 };
3870
3871 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3872                 struct nfs_open_context *ctx,
3873                 struct nfs4_lock_state *lsp,
3874                 struct nfs_seqid *seqid)
3875 {
3876         struct nfs4_unlockdata *data;
3877         struct rpc_message msg = {
3878                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3879                 .rpc_cred = ctx->cred,
3880         };
3881         struct rpc_task_setup task_setup_data = {
3882                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3883                 .rpc_message = &msg,
3884                 .callback_ops = &nfs4_locku_ops,
3885                 .workqueue = nfsiod_workqueue,
3886                 .flags = RPC_TASK_ASYNC,
3887         };
3888
3889         /* Ensure this is an unlock - when canceling a lock, the
3890          * canceled lock is passed in, and it won't be an unlock.
3891          */
3892         fl->fl_type = F_UNLCK;
3893
3894         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3895         if (data == NULL) {
3896                 nfs_free_seqid(seqid);
3897                 return ERR_PTR(-ENOMEM);
3898         }
3899
3900         msg.rpc_argp = &data->arg,
3901         msg.rpc_resp = &data->res,
3902         task_setup_data.callback_data = data;
3903         return rpc_run_task(&task_setup_data);
3904 }
3905
3906 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3907 {
3908         struct nfs_inode *nfsi = NFS_I(state->inode);
3909         struct nfs_seqid *seqid;
3910         struct nfs4_lock_state *lsp;
3911         struct rpc_task *task;
3912         int status = 0;
3913         unsigned char fl_flags = request->fl_flags;
3914
3915         status = nfs4_set_lock_state(state, request);
3916         /* Unlock _before_ we do the RPC call */
3917         request->fl_flags |= FL_EXISTS;
3918         down_read(&nfsi->rwsem);
3919         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3920                 up_read(&nfsi->rwsem);
3921                 goto out;
3922         }
3923         up_read(&nfsi->rwsem);
3924         if (status != 0)
3925                 goto out;
3926         /* Is this a delegated lock? */
3927         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3928                 goto out;
3929         lsp = request->fl_u.nfs4_fl.owner;
3930         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3931         status = -ENOMEM;
3932         if (seqid == NULL)
3933                 goto out;
3934         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3935         status = PTR_ERR(task);
3936         if (IS_ERR(task))
3937                 goto out;
3938         status = nfs4_wait_for_completion_rpc_task(task);
3939         rpc_put_task(task);
3940 out:
3941         request->fl_flags = fl_flags;
3942         return status;
3943 }
3944
3945 struct nfs4_lockdata {
3946         struct nfs_lock_args arg;
3947         struct nfs_lock_res res;
3948         struct nfs4_lock_state *lsp;
3949         struct nfs_open_context *ctx;
3950         struct file_lock fl;
3951         unsigned long timestamp;
3952         int rpc_status;
3953         int cancelled;
3954         struct nfs_server *server;
3955 };
3956
3957 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3958                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
3959                 gfp_t gfp_mask)
3960 {
3961         struct nfs4_lockdata *p;
3962         struct inode *inode = lsp->ls_state->inode;
3963         struct nfs_server *server = NFS_SERVER(inode);
3964
3965         p = kzalloc(sizeof(*p), gfp_mask);
3966         if (p == NULL)
3967                 return NULL;
3968
3969         p->arg.fh = NFS_FH(inode);
3970         p->arg.fl = &p->fl;
3971         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
3972         if (p->arg.open_seqid == NULL)
3973                 goto out_free;
3974         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
3975         if (p->arg.lock_seqid == NULL)
3976                 goto out_free_seqid;
3977         p->arg.lock_stateid = &lsp->ls_stateid;
3978         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3979         p->arg.lock_owner.id = lsp->ls_id.id;
3980         p->res.lock_seqid = p->arg.lock_seqid;
3981         p->lsp = lsp;
3982         p->server = server;
3983         atomic_inc(&lsp->ls_count);
3984         p->ctx = get_nfs_open_context(ctx);
3985         memcpy(&p->fl, fl, sizeof(p->fl));
3986         return p;
3987 out_free_seqid:
3988         nfs_free_seqid(p->arg.open_seqid);
3989 out_free:
3990         kfree(p);
3991         return NULL;
3992 }
3993
3994 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3995 {
3996         struct nfs4_lockdata *data = calldata;
3997         struct nfs4_state *state = data->lsp->ls_state;
3998
3999         dprintk("%s: begin!\n", __func__);
4000         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4001                 return;
4002         /* Do we need to do an open_to_lock_owner? */
4003         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4004                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4005                         return;
4006                 data->arg.open_stateid = &state->stateid;
4007                 data->arg.new_lock_owner = 1;
4008                 data->res.open_seqid = data->arg.open_seqid;
4009         } else
4010                 data->arg.new_lock_owner = 0;
4011         data->timestamp = jiffies;
4012         if (nfs4_setup_sequence(data->server,
4013                                 &data->arg.seq_args,
4014                                 &data->res.seq_res, 1, task))
4015                 return;
4016         rpc_call_start(task);
4017         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4018 }
4019
4020 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4021 {
4022         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4023         nfs4_lock_prepare(task, calldata);
4024 }
4025
4026 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4027 {
4028         struct nfs4_lockdata *data = calldata;
4029
4030         dprintk("%s: begin!\n", __func__);
4031
4032         if (!nfs4_sequence_done(task, &data->res.seq_res))
4033                 return;
4034
4035         data->rpc_status = task->tk_status;
4036         if (data->arg.new_lock_owner != 0) {
4037                 if (data->rpc_status == 0)
4038                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4039                 else
4040                         goto out;
4041         }
4042         if (data->rpc_status == 0) {
4043                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4044                                         sizeof(data->lsp->ls_stateid.data));
4045                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4046                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4047         }
4048 out:
4049         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4050 }
4051
4052 static void nfs4_lock_release(void *calldata)
4053 {
4054         struct nfs4_lockdata *data = calldata;
4055
4056         dprintk("%s: begin!\n", __func__);
4057         nfs_free_seqid(data->arg.open_seqid);
4058         if (data->cancelled != 0) {
4059                 struct rpc_task *task;
4060                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4061                                 data->arg.lock_seqid);
4062                 if (!IS_ERR(task))
4063                         rpc_put_task(task);
4064                 dprintk("%s: cancelling lock!\n", __func__);
4065         } else
4066                 nfs_free_seqid(data->arg.lock_seqid);
4067         nfs4_put_lock_state(data->lsp);
4068         put_nfs_open_context(data->ctx);
4069         kfree(data);
4070         dprintk("%s: done!\n", __func__);
4071 }
4072
4073 static const struct rpc_call_ops nfs4_lock_ops = {
4074         .rpc_call_prepare = nfs4_lock_prepare,
4075         .rpc_call_done = nfs4_lock_done,
4076         .rpc_release = nfs4_lock_release,
4077 };
4078
4079 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4080         .rpc_call_prepare = nfs4_recover_lock_prepare,
4081         .rpc_call_done = nfs4_lock_done,
4082         .rpc_release = nfs4_lock_release,
4083 };
4084
4085 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4086 {
4087         struct nfs_client *clp = server->nfs_client;
4088         struct nfs4_state *state = lsp->ls_state;
4089
4090         switch (error) {
4091         case -NFS4ERR_ADMIN_REVOKED:
4092         case -NFS4ERR_BAD_STATEID:
4093         case -NFS4ERR_EXPIRED:
4094                 if (new_lock_owner != 0 ||
4095                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4096                         nfs4_state_mark_reclaim_nograce(clp, state);
4097                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4098                 break;
4099         case -NFS4ERR_STALE_STATEID:
4100                 if (new_lock_owner != 0 ||
4101                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4102                         nfs4_state_mark_reclaim_reboot(clp, state);
4103                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4104         };
4105 }
4106
4107 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4108 {
4109         struct nfs4_lockdata *data;
4110         struct rpc_task *task;
4111         struct rpc_message msg = {
4112                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4113                 .rpc_cred = state->owner->so_cred,
4114         };
4115         struct rpc_task_setup task_setup_data = {
4116                 .rpc_client = NFS_CLIENT(state->inode),
4117                 .rpc_message = &msg,
4118                 .callback_ops = &nfs4_lock_ops,
4119                 .workqueue = nfsiod_workqueue,
4120                 .flags = RPC_TASK_ASYNC,
4121         };
4122         int ret;
4123
4124         dprintk("%s: begin!\n", __func__);
4125         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4126                         fl->fl_u.nfs4_fl.owner,
4127                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4128         if (data == NULL)
4129                 return -ENOMEM;
4130         if (IS_SETLKW(cmd))
4131                 data->arg.block = 1;
4132         if (recovery_type > NFS_LOCK_NEW) {
4133                 if (recovery_type == NFS_LOCK_RECLAIM)
4134                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4135                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4136         }
4137         msg.rpc_argp = &data->arg,
4138         msg.rpc_resp = &data->res,
4139         task_setup_data.callback_data = data;
4140         task = rpc_run_task(&task_setup_data);
4141         if (IS_ERR(task))
4142                 return PTR_ERR(task);
4143         ret = nfs4_wait_for_completion_rpc_task(task);
4144         if (ret == 0) {
4145                 ret = data->rpc_status;
4146                 if (ret)
4147                         nfs4_handle_setlk_error(data->server, data->lsp,
4148                                         data->arg.new_lock_owner, ret);
4149         } else
4150                 data->cancelled = 1;
4151         rpc_put_task(task);
4152         dprintk("%s: done, ret = %d!\n", __func__, ret);
4153         return ret;
4154 }
4155
4156 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4157 {
4158         struct nfs_server *server = NFS_SERVER(state->inode);
4159         struct nfs4_exception exception = { };
4160         int err;
4161
4162         do {
4163                 /* Cache the lock if possible... */
4164                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4165                         return 0;
4166                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4167                 if (err != -NFS4ERR_DELAY)
4168                         break;
4169                 nfs4_handle_exception(server, err, &exception);
4170         } while (exception.retry);
4171         return err;
4172 }
4173
4174 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4175 {
4176         struct nfs_server *server = NFS_SERVER(state->inode);
4177         struct nfs4_exception exception = { };
4178         int err;
4179
4180         err = nfs4_set_lock_state(state, request);
4181         if (err != 0)
4182                 return err;
4183         do {
4184                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4185                         return 0;
4186                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4187                 switch (err) {
4188                 default:
4189                         goto out;
4190                 case -NFS4ERR_GRACE:
4191                 case -NFS4ERR_DELAY:
4192                         nfs4_handle_exception(server, err, &exception);
4193                         err = 0;
4194                 }
4195         } while (exception.retry);
4196 out:
4197         return err;
4198 }
4199
4200 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4201 {
4202         struct nfs_inode *nfsi = NFS_I(state->inode);
4203         unsigned char fl_flags = request->fl_flags;
4204         int status = -ENOLCK;
4205
4206         if ((fl_flags & FL_POSIX) &&
4207                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4208                 goto out;
4209         /* Is this a delegated open? */
4210         status = nfs4_set_lock_state(state, request);
4211         if (status != 0)
4212                 goto out;
4213         request->fl_flags |= FL_ACCESS;
4214         status = do_vfs_lock(request->fl_file, request);
4215         if (status < 0)
4216                 goto out;
4217         down_read(&nfsi->rwsem);
4218         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4219                 /* Yes: cache locks! */
4220                 /* ...but avoid races with delegation recall... */
4221                 request->fl_flags = fl_flags & ~FL_SLEEP;
4222                 status = do_vfs_lock(request->fl_file, request);
4223                 goto out_unlock;
4224         }
4225         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4226         if (status != 0)
4227                 goto out_unlock;
4228         /* Note: we always want to sleep here! */
4229         request->fl_flags = fl_flags | FL_SLEEP;
4230         if (do_vfs_lock(request->fl_file, request) < 0)
4231                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4232 out_unlock:
4233         up_read(&nfsi->rwsem);
4234 out:
4235         request->fl_flags = fl_flags;
4236         return status;
4237 }
4238
4239 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4240 {
4241         struct nfs4_exception exception = { };
4242         int err;
4243
4244         do {
4245                 err = _nfs4_proc_setlk(state, cmd, request);
4246                 if (err == -NFS4ERR_DENIED)
4247                         err = -EAGAIN;
4248                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4249                                 err, &exception);
4250         } while (exception.retry);
4251         return err;
4252 }
4253
4254 static int
4255 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4256 {
4257         struct nfs_open_context *ctx;
4258         struct nfs4_state *state;
4259         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4260         int status;
4261
4262         /* verify open state */
4263         ctx = nfs_file_open_context(filp);
4264         state = ctx->state;
4265
4266         if (request->fl_start < 0 || request->fl_end < 0)
4267                 return -EINVAL;
4268
4269         if (IS_GETLK(cmd)) {
4270                 if (state != NULL)
4271                         return nfs4_proc_getlk(state, F_GETLK, request);
4272                 return 0;
4273         }
4274
4275         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4276                 return -EINVAL;
4277
4278         if (request->fl_type == F_UNLCK) {
4279                 if (state != NULL)
4280                         return nfs4_proc_unlck(state, cmd, request);
4281                 return 0;
4282         }
4283
4284         if (state == NULL)
4285                 return -ENOLCK;
4286         do {
4287                 status = nfs4_proc_setlk(state, cmd, request);
4288                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4289                         break;
4290                 timeout = nfs4_set_lock_task_retry(timeout);
4291                 status = -ERESTARTSYS;
4292                 if (signalled())
4293                         break;
4294         } while(status < 0);
4295         return status;
4296 }
4297
4298 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4299 {
4300         struct nfs_server *server = NFS_SERVER(state->inode);
4301         struct nfs4_exception exception = { };
4302         int err;
4303
4304         err = nfs4_set_lock_state(state, fl);
4305         if (err != 0)
4306                 goto out;
4307         do {
4308                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4309                 switch (err) {
4310                         default:
4311                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4312                                                 __func__, err);
4313                         case 0:
4314                         case -ESTALE:
4315                                 goto out;
4316                         case -NFS4ERR_EXPIRED:
4317                         case -NFS4ERR_STALE_CLIENTID:
4318                         case -NFS4ERR_STALE_STATEID:
4319                         case -NFS4ERR_BADSESSION:
4320                         case -NFS4ERR_BADSLOT:
4321                         case -NFS4ERR_BAD_HIGH_SLOT:
4322                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4323                         case -NFS4ERR_DEADSESSION:
4324                                 nfs4_schedule_state_recovery(server->nfs_client);
4325                                 goto out;
4326                         case -ERESTARTSYS:
4327                                 /*
4328                                  * The show must go on: exit, but mark the
4329                                  * stateid as needing recovery.
4330                                  */
4331                         case -NFS4ERR_ADMIN_REVOKED:
4332                         case -NFS4ERR_BAD_STATEID:
4333                         case -NFS4ERR_OPENMODE:
4334                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4335                                 err = 0;
4336                                 goto out;
4337                         case -EKEYEXPIRED:
4338                                 /*
4339                                  * User RPCSEC_GSS context has expired.
4340                                  * We cannot recover this stateid now, so
4341                                  * skip it and allow recovery thread to
4342                                  * proceed.
4343                                  */
4344                                 err = 0;
4345                                 goto out;
4346                         case -ENOMEM:
4347                         case -NFS4ERR_DENIED:
4348                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4349                                 err = 0;
4350                                 goto out;
4351                         case -NFS4ERR_DELAY:
4352                                 break;
4353                 }
4354                 err = nfs4_handle_exception(server, err, &exception);
4355         } while (exception.retry);
4356 out:
4357         return err;
4358 }
4359
4360 static void nfs4_release_lockowner_release(void *calldata)
4361 {
4362         kfree(calldata);
4363 }
4364
4365 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4366         .rpc_release = nfs4_release_lockowner_release,
4367 };
4368
4369 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4370 {
4371         struct nfs_server *server = lsp->ls_state->owner->so_server;
4372         struct nfs_release_lockowner_args *args;
4373         struct rpc_message msg = {
4374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4375         };
4376
4377         if (server->nfs_client->cl_mvops->minor_version != 0)
4378                 return;
4379         args = kmalloc(sizeof(*args), GFP_NOFS);
4380         if (!args)
4381                 return;
4382         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4383         args->lock_owner.id = lsp->ls_id.id;
4384         msg.rpc_argp = args;
4385         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4386 }
4387
4388 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4389
4390 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4391                 size_t buflen, int flags)
4392 {
4393         struct inode *inode = dentry->d_inode;
4394
4395         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4396                 return -EOPNOTSUPP;
4397
4398         return nfs4_proc_set_acl(inode, buf, buflen);
4399 }
4400
4401 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4402  * and that's what we'll do for e.g. user attributes that haven't been set.
4403  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4404  * attributes in kernel-managed attribute namespaces. */
4405 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4406                 size_t buflen)
4407 {
4408         struct inode *inode = dentry->d_inode;
4409
4410         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4411                 return -EOPNOTSUPP;
4412
4413         return nfs4_proc_get_acl(inode, buf, buflen);
4414 }
4415
4416 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4417 {
4418         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4419
4420         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4421                 return 0;
4422         if (buf && buflen < len)
4423                 return -ERANGE;
4424         if (buf)
4425                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4426         return len;
4427 }
4428
4429 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4430 {
4431         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4432                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4433                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4434                 return;
4435
4436         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4437                 NFS_ATTR_FATTR_NLINK;
4438         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4439         fattr->nlink = 2;
4440 }
4441
4442 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4443                 struct nfs4_fs_locations *fs_locations, struct page *page)
4444 {
4445         struct nfs_server *server = NFS_SERVER(dir);
4446         u32 bitmask[2] = {
4447                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4448                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4449         };
4450         struct nfs4_fs_locations_arg args = {
4451                 .dir_fh = NFS_FH(dir),
4452                 .name = name,
4453                 .page = page,
4454                 .bitmask = bitmask,
4455         };
4456         struct nfs4_fs_locations_res res = {
4457                 .fs_locations = fs_locations,
4458         };
4459         struct rpc_message msg = {
4460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4461                 .rpc_argp = &args,
4462                 .rpc_resp = &res,
4463         };
4464         int status;
4465
4466         dprintk("%s: start\n", __func__);
4467         nfs_fattr_init(&fs_locations->fattr);
4468         fs_locations->server = server;
4469         fs_locations->nlocations = 0;
4470         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4471         nfs_fixup_referral_attributes(&fs_locations->fattr);
4472         dprintk("%s: returned status = %d\n", __func__, status);
4473         return status;
4474 }
4475
4476 #ifdef CONFIG_NFS_V4_1
4477 /*
4478  * nfs4_proc_exchange_id()
4479  *
4480  * Since the clientid has expired, all compounds using sessions
4481  * associated with the stale clientid will be returning
4482  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4483  * be in some phase of session reset.
4484  */
4485 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4486 {
4487         nfs4_verifier verifier;
4488         struct nfs41_exchange_id_args args = {
4489                 .client = clp,
4490                 .flags = clp->cl_exchange_flags,
4491         };
4492         struct nfs41_exchange_id_res res = {
4493                 .client = clp,
4494         };
4495         int status;
4496         struct rpc_message msg = {
4497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4498                 .rpc_argp = &args,
4499                 .rpc_resp = &res,
4500                 .rpc_cred = cred,
4501         };
4502         __be32 *p;
4503
4504         dprintk("--> %s\n", __func__);
4505         BUG_ON(clp == NULL);
4506
4507         /* Remove server-only flags */
4508         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4509
4510         p = (u32 *)verifier.data;
4511         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4512         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4513         args.verifier = &verifier;
4514
4515         while (1) {
4516                 args.id_len = scnprintf(args.id, sizeof(args.id),
4517                                         "%s/%s %u",
4518                                         clp->cl_ipaddr,
4519                                         rpc_peeraddr2str(clp->cl_rpcclient,
4520                                                          RPC_DISPLAY_ADDR),
4521                                         clp->cl_id_uniquifier);
4522
4523                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4524
4525                 if (status != -NFS4ERR_CLID_INUSE)
4526                         break;
4527
4528                 if (signalled())
4529                         break;
4530
4531                 if (++clp->cl_id_uniquifier == 0)
4532                         break;
4533         }
4534
4535         dprintk("<-- %s status= %d\n", __func__, status);
4536         return status;
4537 }
4538
4539 struct nfs4_get_lease_time_data {
4540         struct nfs4_get_lease_time_args *args;
4541         struct nfs4_get_lease_time_res *res;
4542         struct nfs_client *clp;
4543 };
4544
4545 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4546                                         void *calldata)
4547 {
4548         int ret;
4549         struct nfs4_get_lease_time_data *data =
4550                         (struct nfs4_get_lease_time_data *)calldata;
4551
4552         dprintk("--> %s\n", __func__);
4553         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4554         /* just setup sequence, do not trigger session recovery
4555            since we're invoked within one */
4556         ret = nfs41_setup_sequence(data->clp->cl_session,
4557                                    &data->args->la_seq_args,
4558                                    &data->res->lr_seq_res, 0, task);
4559
4560         BUG_ON(ret == -EAGAIN);
4561         rpc_call_start(task);
4562         dprintk("<-- %s\n", __func__);
4563 }
4564
4565 /*
4566  * Called from nfs4_state_manager thread for session setup, so don't recover
4567  * from sequence operation or clientid errors.
4568  */
4569 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4570 {
4571         struct nfs4_get_lease_time_data *data =
4572                         (struct nfs4_get_lease_time_data *)calldata;
4573
4574         dprintk("--> %s\n", __func__);
4575         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4576                 return;
4577         switch (task->tk_status) {
4578         case -NFS4ERR_DELAY:
4579         case -NFS4ERR_GRACE:
4580                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4581                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4582                 task->tk_status = 0;
4583                 nfs_restart_rpc(task, data->clp);
4584                 return;
4585         }
4586         dprintk("<-- %s\n", __func__);
4587 }
4588
4589 struct rpc_call_ops nfs4_get_lease_time_ops = {
4590         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4591         .rpc_call_done = nfs4_get_lease_time_done,
4592 };
4593
4594 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4595 {
4596         struct rpc_task *task;
4597         struct nfs4_get_lease_time_args args;
4598         struct nfs4_get_lease_time_res res = {
4599                 .lr_fsinfo = fsinfo,
4600         };
4601         struct nfs4_get_lease_time_data data = {
4602                 .args = &args,
4603                 .res = &res,
4604                 .clp = clp,
4605         };
4606         struct rpc_message msg = {
4607                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4608                 .rpc_argp = &args,
4609                 .rpc_resp = &res,
4610         };
4611         struct rpc_task_setup task_setup = {
4612                 .rpc_client = clp->cl_rpcclient,
4613                 .rpc_message = &msg,
4614                 .callback_ops = &nfs4_get_lease_time_ops,
4615                 .callback_data = &data
4616         };
4617         int status;
4618
4619         dprintk("--> %s\n", __func__);
4620         task = rpc_run_task(&task_setup);
4621
4622         if (IS_ERR(task))
4623                 status = PTR_ERR(task);
4624         else {
4625                 status = task->tk_status;
4626                 rpc_put_task(task);
4627         }
4628         dprintk("<-- %s return %d\n", __func__, status);
4629
4630         return status;
4631 }
4632
4633 /*
4634  * Reset a slot table
4635  */
4636 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4637                                  int ivalue)
4638 {
4639         struct nfs4_slot *new = NULL;
4640         int i;
4641         int ret = 0;
4642
4643         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4644                 max_reqs, tbl->max_slots);
4645
4646         /* Does the newly negotiated max_reqs match the existing slot table? */
4647         if (max_reqs != tbl->max_slots) {
4648                 ret = -ENOMEM;
4649                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4650                               GFP_NOFS);
4651                 if (!new)
4652                         goto out;
4653                 ret = 0;
4654                 kfree(tbl->slots);
4655         }
4656         spin_lock(&tbl->slot_tbl_lock);
4657         if (new) {
4658                 tbl->slots = new;
4659                 tbl->max_slots = max_reqs;
4660         }
4661         for (i = 0; i < tbl->max_slots; ++i)
4662                 tbl->slots[i].seq_nr = ivalue;
4663         spin_unlock(&tbl->slot_tbl_lock);
4664         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4665                 tbl, tbl->slots, tbl->max_slots);
4666 out:
4667         dprintk("<-- %s: return %d\n", __func__, ret);
4668         return ret;
4669 }
4670
4671 /*
4672  * Reset the forechannel and backchannel slot tables
4673  */
4674 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4675 {
4676         int status;
4677
4678         status = nfs4_reset_slot_table(&session->fc_slot_table,
4679                         session->fc_attrs.max_reqs, 1);
4680         if (status)
4681                 return status;
4682
4683         status = nfs4_reset_slot_table(&session->bc_slot_table,
4684                         session->bc_attrs.max_reqs, 0);
4685         return status;
4686 }
4687
4688 /* Destroy the slot table */
4689 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4690 {
4691         if (session->fc_slot_table.slots != NULL) {
4692                 kfree(session->fc_slot_table.slots);
4693                 session->fc_slot_table.slots = NULL;
4694         }
4695         if (session->bc_slot_table.slots != NULL) {
4696                 kfree(session->bc_slot_table.slots);
4697                 session->bc_slot_table.slots = NULL;
4698         }
4699         return;
4700 }
4701
4702 /*
4703  * Initialize slot table
4704  */
4705 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4706                 int max_slots, int ivalue)
4707 {
4708         struct nfs4_slot *slot;
4709         int ret = -ENOMEM;
4710
4711         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4712
4713         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4714
4715         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4716         if (!slot)
4717                 goto out;
4718         ret = 0;
4719
4720         spin_lock(&tbl->slot_tbl_lock);
4721         tbl->max_slots = max_slots;
4722         tbl->slots = slot;
4723         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4724         spin_unlock(&tbl->slot_tbl_lock);
4725         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4726                 tbl, tbl->slots, tbl->max_slots);
4727 out:
4728         dprintk("<-- %s: return %d\n", __func__, ret);
4729         return ret;
4730 }
4731
4732 /*
4733  * Initialize the forechannel and backchannel tables
4734  */
4735 static int nfs4_init_slot_tables(struct nfs4_session *session)
4736 {
4737         struct nfs4_slot_table *tbl;
4738         int status = 0;
4739
4740         tbl = &session->fc_slot_table;
4741         if (tbl->slots == NULL) {
4742                 status = nfs4_init_slot_table(tbl,
4743                                 session->fc_attrs.max_reqs, 1);
4744                 if (status)
4745                         return status;
4746         }
4747
4748         tbl = &session->bc_slot_table;
4749         if (tbl->slots == NULL) {
4750                 status = nfs4_init_slot_table(tbl,
4751                                 session->bc_attrs.max_reqs, 0);
4752                 if (status)
4753                         nfs4_destroy_slot_tables(session);
4754         }
4755
4756         return status;
4757 }
4758
4759 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4760 {
4761         struct nfs4_session *session;
4762         struct nfs4_slot_table *tbl;
4763
4764         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4765         if (!session)
4766                 return NULL;
4767
4768         init_completion(&session->complete);
4769
4770         tbl = &session->fc_slot_table;
4771         tbl->highest_used_slotid = -1;
4772         spin_lock_init(&tbl->slot_tbl_lock);
4773         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4774
4775         tbl = &session->bc_slot_table;
4776         tbl->highest_used_slotid = -1;
4777         spin_lock_init(&tbl->slot_tbl_lock);
4778         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4779
4780         session->session_state = 1<<NFS4_SESSION_INITING;
4781
4782         session->clp = clp;
4783         return session;
4784 }
4785
4786 void nfs4_destroy_session(struct nfs4_session *session)
4787 {
4788         nfs4_proc_destroy_session(session);
4789         dprintk("%s Destroy backchannel for xprt %p\n",
4790                 __func__, session->clp->cl_rpcclient->cl_xprt);
4791         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4792                                 NFS41_BC_MIN_CALLBACKS);
4793         nfs4_destroy_slot_tables(session);
4794         kfree(session);
4795 }
4796
4797 /*
4798  * Initialize the values to be used by the client in CREATE_SESSION
4799  * If nfs4_init_session set the fore channel request and response sizes,
4800  * use them.
4801  *
4802  * Set the back channel max_resp_sz_cached to zero to force the client to
4803  * always set csa_cachethis to FALSE because the current implementation
4804  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4805  */
4806 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4807 {
4808         struct nfs4_session *session = args->client->cl_session;
4809         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4810                      mxresp_sz = session->fc_attrs.max_resp_sz;
4811
4812         if (mxrqst_sz == 0)
4813                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4814         if (mxresp_sz == 0)
4815                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4816         /* Fore channel attributes */
4817         args->fc_attrs.headerpadsz = 0;
4818         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4819         args->fc_attrs.max_resp_sz = mxresp_sz;
4820         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4821         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4822
4823         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4824                 "max_ops=%u max_reqs=%u\n",
4825                 __func__,
4826                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4827                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4828
4829         /* Back channel attributes */
4830         args->bc_attrs.headerpadsz = 0;
4831         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4832         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4833         args->bc_attrs.max_resp_sz_cached = 0;
4834         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4835         args->bc_attrs.max_reqs = 1;
4836
4837         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4838                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4839                 __func__,
4840                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4841                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4842                 args->bc_attrs.max_reqs);
4843 }
4844
4845 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4846 {
4847         struct nfs4_channel_attrs *sent = &args->fc_attrs;
4848         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4849
4850         if (rcvd->headerpadsz > sent->headerpadsz)
4851                 return -EINVAL;
4852         if (rcvd->max_resp_sz > sent->max_resp_sz)
4853                 return -EINVAL;
4854         /*
4855          * Our requested max_ops is the minimum we need; we're not
4856          * prepared to break up compounds into smaller pieces than that.
4857          * So, no point even trying to continue if the server won't
4858          * cooperate:
4859          */
4860         if (rcvd->max_ops < sent->max_ops)
4861                 return -EINVAL;
4862         if (rcvd->max_reqs == 0)
4863                 return -EINVAL;
4864         return 0;
4865 }
4866
4867 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4868 {
4869         struct nfs4_channel_attrs *sent = &args->bc_attrs;
4870         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4871
4872         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4873                 return -EINVAL;
4874         if (rcvd->max_resp_sz < sent->max_resp_sz)
4875                 return -EINVAL;
4876         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4877                 return -EINVAL;
4878         /* These would render the backchannel useless: */
4879         if (rcvd->max_ops  == 0)
4880                 return -EINVAL;
4881         if (rcvd->max_reqs == 0)
4882                 return -EINVAL;
4883         return 0;
4884 }
4885
4886 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4887                                      struct nfs4_session *session)
4888 {
4889         int ret;
4890
4891         ret = nfs4_verify_fore_channel_attrs(args, session);
4892         if (ret)
4893                 return ret;
4894         return nfs4_verify_back_channel_attrs(args, session);
4895 }
4896
4897 static int _nfs4_proc_create_session(struct nfs_client *clp)
4898 {
4899         struct nfs4_session *session = clp->cl_session;
4900         struct nfs41_create_session_args args = {
4901                 .client = clp,
4902                 .cb_program = NFS4_CALLBACK,
4903         };
4904         struct nfs41_create_session_res res = {
4905                 .client = clp,
4906         };
4907         struct rpc_message msg = {
4908                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4909                 .rpc_argp = &args,
4910                 .rpc_resp = &res,
4911         };
4912         int status;
4913
4914         nfs4_init_channel_attrs(&args);
4915         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4916
4917         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4918
4919         if (!status)
4920                 /* Verify the session's negotiated channel_attrs values */
4921                 status = nfs4_verify_channel_attrs(&args, session);
4922         if (!status) {
4923                 /* Increment the clientid slot sequence id */
4924                 clp->cl_seqid++;
4925         }
4926
4927         return status;
4928 }
4929
4930 /*
4931  * Issues a CREATE_SESSION operation to the server.
4932  * It is the responsibility of the caller to verify the session is
4933  * expired before calling this routine.
4934  */
4935 int nfs4_proc_create_session(struct nfs_client *clp)
4936 {
4937         int status;
4938         unsigned *ptr;
4939         struct nfs4_session *session = clp->cl_session;
4940
4941         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4942
4943         status = _nfs4_proc_create_session(clp);
4944         if (status)
4945                 goto out;
4946
4947         /* Init and reset the fore channel */
4948         status = nfs4_init_slot_tables(session);
4949         dprintk("slot table initialization returned %d\n", status);
4950         if (status)
4951                 goto out;
4952         status = nfs4_reset_slot_tables(session);
4953         dprintk("slot table reset returned %d\n", status);
4954         if (status)
4955                 goto out;
4956
4957         ptr = (unsigned *)&session->sess_id.data[0];
4958         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4959                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4960 out:
4961         dprintk("<-- %s\n", __func__);
4962         return status;
4963 }
4964
4965 /*
4966  * Issue the over-the-wire RPC DESTROY_SESSION.
4967  * The caller must serialize access to this routine.
4968  */
4969 int nfs4_proc_destroy_session(struct nfs4_session *session)
4970 {
4971         int status = 0;
4972         struct rpc_message msg;
4973
4974         dprintk("--> nfs4_proc_destroy_session\n");
4975
4976         /* session is still being setup */
4977         if (session->clp->cl_cons_state != NFS_CS_READY)
4978                 return status;
4979
4980         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4981         msg.rpc_argp = session;
4982         msg.rpc_resp = NULL;
4983         msg.rpc_cred = NULL;
4984         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4985
4986         if (status)
4987                 printk(KERN_WARNING
4988                         "Got error %d from the server on DESTROY_SESSION. "
4989                         "Session has been destroyed regardless...\n", status);
4990
4991         dprintk("<-- nfs4_proc_destroy_session\n");
4992         return status;
4993 }
4994
4995 int nfs4_init_session(struct nfs_server *server)
4996 {
4997         struct nfs_client *clp = server->nfs_client;
4998         struct nfs4_session *session;
4999         unsigned int rsize, wsize;
5000         int ret;
5001
5002         if (!nfs4_has_session(clp))
5003                 return 0;
5004
5005         session = clp->cl_session;
5006         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5007                 return 0;
5008
5009         rsize = server->rsize;
5010         if (rsize == 0)
5011                 rsize = NFS_MAX_FILE_IO_SIZE;
5012         wsize = server->wsize;
5013         if (wsize == 0)
5014                 wsize = NFS_MAX_FILE_IO_SIZE;
5015
5016         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5017         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5018
5019         ret = nfs4_recover_expired_lease(server);
5020         if (!ret)
5021                 ret = nfs4_check_client_ready(clp);
5022         return ret;
5023 }
5024
5025 /*
5026  * Renew the cl_session lease.
5027  */
5028 struct nfs4_sequence_data {
5029         struct nfs_client *clp;
5030         struct nfs4_sequence_args args;
5031         struct nfs4_sequence_res res;
5032 };
5033
5034 static void nfs41_sequence_release(void *data)
5035 {
5036         struct nfs4_sequence_data *calldata = data;
5037         struct nfs_client *clp = calldata->clp;
5038
5039         if (atomic_read(&clp->cl_count) > 1)
5040                 nfs4_schedule_state_renewal(clp);
5041         nfs_put_client(clp);
5042         kfree(calldata);
5043 }
5044
5045 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5046 {
5047         switch(task->tk_status) {
5048         case -NFS4ERR_DELAY:
5049                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5050                 return -EAGAIN;
5051         default:
5052                 nfs4_schedule_state_recovery(clp);
5053         }
5054         return 0;
5055 }
5056
5057 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5058 {
5059         struct nfs4_sequence_data *calldata = data;
5060         struct nfs_client *clp = calldata->clp;
5061
5062         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5063                 return;
5064
5065         if (task->tk_status < 0) {
5066                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5067                 if (atomic_read(&clp->cl_count) == 1)
5068                         goto out;
5069
5070                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5071                         rpc_restart_call_prepare(task);
5072                         return;
5073                 }
5074         }
5075         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5076 out:
5077         dprintk("<-- %s\n", __func__);
5078 }
5079
5080 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5081 {
5082         struct nfs4_sequence_data *calldata = data;
5083         struct nfs_client *clp = calldata->clp;
5084         struct nfs4_sequence_args *args;
5085         struct nfs4_sequence_res *res;
5086
5087         args = task->tk_msg.rpc_argp;
5088         res = task->tk_msg.rpc_resp;
5089
5090         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5091                 return;
5092         rpc_call_start(task);
5093 }
5094
5095 static const struct rpc_call_ops nfs41_sequence_ops = {
5096         .rpc_call_done = nfs41_sequence_call_done,
5097         .rpc_call_prepare = nfs41_sequence_prepare,
5098         .rpc_release = nfs41_sequence_release,
5099 };
5100
5101 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5102 {
5103         struct nfs4_sequence_data *calldata;
5104         struct rpc_message msg = {
5105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5106                 .rpc_cred = cred,
5107         };
5108         struct rpc_task_setup task_setup_data = {
5109                 .rpc_client = clp->cl_rpcclient,
5110                 .rpc_message = &msg,
5111                 .callback_ops = &nfs41_sequence_ops,
5112                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5113         };
5114
5115         if (!atomic_inc_not_zero(&clp->cl_count))
5116                 return ERR_PTR(-EIO);
5117         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5118         if (calldata == NULL) {
5119                 nfs_put_client(clp);
5120                 return ERR_PTR(-ENOMEM);
5121         }
5122         msg.rpc_argp = &calldata->args;
5123         msg.rpc_resp = &calldata->res;
5124         calldata->clp = clp;
5125         task_setup_data.callback_data = calldata;
5126
5127         return rpc_run_task(&task_setup_data);
5128 }
5129
5130 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5131 {
5132         struct rpc_task *task;
5133         int ret = 0;
5134
5135         task = _nfs41_proc_sequence(clp, cred);
5136         if (IS_ERR(task))
5137                 ret = PTR_ERR(task);
5138         else
5139                 rpc_put_task(task);
5140         dprintk("<-- %s status=%d\n", __func__, ret);
5141         return ret;
5142 }
5143
5144 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5145 {
5146         struct rpc_task *task;
5147         int ret;
5148
5149         task = _nfs41_proc_sequence(clp, cred);
5150         if (IS_ERR(task)) {
5151                 ret = PTR_ERR(task);
5152                 goto out;
5153         }
5154         ret = rpc_wait_for_completion_task(task);
5155         if (!ret)
5156                 ret = task->tk_status;
5157         rpc_put_task(task);
5158 out:
5159         dprintk("<-- %s status=%d\n", __func__, ret);
5160         return ret;
5161 }
5162
5163 struct nfs4_reclaim_complete_data {
5164         struct nfs_client *clp;
5165         struct nfs41_reclaim_complete_args arg;
5166         struct nfs41_reclaim_complete_res res;
5167 };
5168
5169 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5170 {
5171         struct nfs4_reclaim_complete_data *calldata = data;
5172
5173         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5174         if (nfs41_setup_sequence(calldata->clp->cl_session,
5175                                 &calldata->arg.seq_args,
5176                                 &calldata->res.seq_res, 0, task))
5177                 return;
5178
5179         rpc_call_start(task);
5180 }
5181
5182 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5183 {
5184         switch(task->tk_status) {
5185         case 0:
5186         case -NFS4ERR_COMPLETE_ALREADY:
5187         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5188                 break;
5189         case -NFS4ERR_DELAY:
5190                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5191                 return -EAGAIN;
5192         default:
5193                 nfs4_schedule_state_recovery(clp);
5194         }
5195         return 0;
5196 }
5197
5198 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5199 {
5200         struct nfs4_reclaim_complete_data *calldata = data;
5201         struct nfs_client *clp = calldata->clp;
5202         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5203
5204         dprintk("--> %s\n", __func__);
5205         if (!nfs41_sequence_done(task, res))
5206                 return;
5207
5208         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5209                 rpc_restart_call_prepare(task);
5210                 return;
5211         }
5212         dprintk("<-- %s\n", __func__);
5213 }
5214
5215 static void nfs4_free_reclaim_complete_data(void *data)
5216 {
5217         struct nfs4_reclaim_complete_data *calldata = data;
5218
5219         kfree(calldata);
5220 }
5221
5222 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5223         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5224         .rpc_call_done = nfs4_reclaim_complete_done,
5225         .rpc_release = nfs4_free_reclaim_complete_data,
5226 };
5227
5228 /*
5229  * Issue a global reclaim complete.
5230  */
5231 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5232 {
5233         struct nfs4_reclaim_complete_data *calldata;
5234         struct rpc_task *task;
5235         struct rpc_message msg = {
5236                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5237         };
5238         struct rpc_task_setup task_setup_data = {
5239                 .rpc_client = clp->cl_rpcclient,
5240                 .rpc_message = &msg,
5241                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5242                 .flags = RPC_TASK_ASYNC,
5243         };
5244         int status = -ENOMEM;
5245
5246         dprintk("--> %s\n", __func__);
5247         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5248         if (calldata == NULL)
5249                 goto out;
5250         calldata->clp = clp;
5251         calldata->arg.one_fs = 0;
5252
5253         msg.rpc_argp = &calldata->arg;
5254         msg.rpc_resp = &calldata->res;
5255         task_setup_data.callback_data = calldata;
5256         task = rpc_run_task(&task_setup_data);
5257         if (IS_ERR(task)) {
5258                 status = PTR_ERR(task);
5259                 goto out;
5260         }
5261         rpc_put_task(task);
5262         return 0;
5263 out:
5264         dprintk("<-- %s status=%d\n", __func__, status);
5265         return status;
5266 }
5267
5268 static void
5269 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5270 {
5271         struct nfs4_layoutget *lgp = calldata;
5272         struct inode *ino = lgp->args.inode;
5273         struct nfs_server *server = NFS_SERVER(ino);
5274
5275         dprintk("--> %s\n", __func__);
5276         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5277                                 &lgp->res.seq_res, 0, task))
5278                 return;
5279         rpc_call_start(task);
5280 }
5281
5282 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5283 {
5284         struct nfs4_layoutget *lgp = calldata;
5285         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5286
5287         dprintk("--> %s\n", __func__);
5288
5289         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5290                 return;
5291
5292         switch (task->tk_status) {
5293         case 0:
5294                 break;
5295         case -NFS4ERR_LAYOUTTRYLATER:
5296         case -NFS4ERR_RECALLCONFLICT:
5297                 task->tk_status = -NFS4ERR_DELAY;
5298                 /* Fall through */
5299         default:
5300                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5301                         rpc_restart_call_prepare(task);
5302                         return;
5303                 }
5304         }
5305         lgp->status = task->tk_status;
5306         dprintk("<-- %s\n", __func__);
5307 }
5308
5309 static void nfs4_layoutget_release(void *calldata)
5310 {
5311         struct nfs4_layoutget *lgp = calldata;
5312
5313         dprintk("--> %s\n", __func__);
5314         put_layout_hdr(lgp->args.inode);
5315         if (lgp->res.layout.buf != NULL)
5316                 free_page((unsigned long) lgp->res.layout.buf);
5317         put_nfs_open_context(lgp->args.ctx);
5318         kfree(calldata);
5319         dprintk("<-- %s\n", __func__);
5320 }
5321
5322 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5323         .rpc_call_prepare = nfs4_layoutget_prepare,
5324         .rpc_call_done = nfs4_layoutget_done,
5325         .rpc_release = nfs4_layoutget_release,
5326 };
5327
5328 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5329 {
5330         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5331         struct rpc_task *task;
5332         struct rpc_message msg = {
5333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5334                 .rpc_argp = &lgp->args,
5335                 .rpc_resp = &lgp->res,
5336         };
5337         struct rpc_task_setup task_setup_data = {
5338                 .rpc_client = server->client,
5339                 .rpc_message = &msg,
5340                 .callback_ops = &nfs4_layoutget_call_ops,
5341                 .callback_data = lgp,
5342                 .flags = RPC_TASK_ASYNC,
5343         };
5344         int status = 0;
5345
5346         dprintk("--> %s\n", __func__);
5347
5348         lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5349         if (lgp->res.layout.buf == NULL) {
5350                 nfs4_layoutget_release(lgp);
5351                 return -ENOMEM;
5352         }
5353
5354         lgp->res.seq_res.sr_slot = NULL;
5355         task = rpc_run_task(&task_setup_data);
5356         if (IS_ERR(task))
5357                 return PTR_ERR(task);
5358         status = nfs4_wait_for_completion_rpc_task(task);
5359         if (status != 0)
5360                 goto out;
5361         status = lgp->status;
5362         if (status != 0)
5363                 goto out;
5364         status = pnfs_layout_process(lgp);
5365 out:
5366         rpc_put_task(task);
5367         dprintk("<-- %s status=%d\n", __func__, status);
5368         return status;
5369 }
5370
5371 static int
5372 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5373 {
5374         struct nfs4_getdeviceinfo_args args = {
5375                 .pdev = pdev,
5376         };
5377         struct nfs4_getdeviceinfo_res res = {
5378                 .pdev = pdev,
5379         };
5380         struct rpc_message msg = {
5381                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5382                 .rpc_argp = &args,
5383                 .rpc_resp = &res,
5384         };
5385         int status;
5386
5387         dprintk("--> %s\n", __func__);
5388         status = nfs4_call_sync(server, &msg, &args, &res, 0);
5389         dprintk("<-- %s status=%d\n", __func__, status);
5390
5391         return status;
5392 }
5393
5394 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5395 {
5396         struct nfs4_exception exception = { };
5397         int err;
5398
5399         do {
5400                 err = nfs4_handle_exception(server,
5401                                         _nfs4_proc_getdeviceinfo(server, pdev),
5402                                         &exception);
5403         } while (exception.retry);
5404         return err;
5405 }
5406 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5407
5408 #endif /* CONFIG_NFS_V4_1 */
5409
5410 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5411         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5412         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5413         .recover_open   = nfs4_open_reclaim,
5414         .recover_lock   = nfs4_lock_reclaim,
5415         .establish_clid = nfs4_init_clientid,
5416         .get_clid_cred  = nfs4_get_setclientid_cred,
5417 };
5418
5419 #if defined(CONFIG_NFS_V4_1)
5420 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5421         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5422         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5423         .recover_open   = nfs4_open_reclaim,
5424         .recover_lock   = nfs4_lock_reclaim,
5425         .establish_clid = nfs41_init_clientid,
5426         .get_clid_cred  = nfs4_get_exchange_id_cred,
5427         .reclaim_complete = nfs41_proc_reclaim_complete,
5428 };
5429 #endif /* CONFIG_NFS_V4_1 */
5430
5431 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5432         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5433         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5434         .recover_open   = nfs4_open_expired,
5435         .recover_lock   = nfs4_lock_expired,
5436         .establish_clid = nfs4_init_clientid,
5437         .get_clid_cred  = nfs4_get_setclientid_cred,
5438 };
5439
5440 #if defined(CONFIG_NFS_V4_1)
5441 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5442         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5443         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5444         .recover_open   = nfs4_open_expired,
5445         .recover_lock   = nfs4_lock_expired,
5446         .establish_clid = nfs41_init_clientid,
5447         .get_clid_cred  = nfs4_get_exchange_id_cred,
5448 };
5449 #endif /* CONFIG_NFS_V4_1 */
5450
5451 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5452         .sched_state_renewal = nfs4_proc_async_renew,
5453         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5454         .renew_lease = nfs4_proc_renew,
5455 };
5456
5457 #if defined(CONFIG_NFS_V4_1)
5458 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5459         .sched_state_renewal = nfs41_proc_async_sequence,
5460         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5461         .renew_lease = nfs4_proc_sequence,
5462 };
5463 #endif
5464
5465 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5466         .minor_version = 0,
5467         .call_sync = _nfs4_call_sync,
5468         .validate_stateid = nfs4_validate_delegation_stateid,
5469         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5470         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5471         .state_renewal_ops = &nfs40_state_renewal_ops,
5472 };
5473
5474 #if defined(CONFIG_NFS_V4_1)
5475 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5476         .minor_version = 1,
5477         .call_sync = _nfs4_call_sync_session,
5478         .validate_stateid = nfs41_validate_delegation_stateid,
5479         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5480         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5481         .state_renewal_ops = &nfs41_state_renewal_ops,
5482 };
5483 #endif
5484
5485 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5486         [0] = &nfs_v4_0_minor_ops,
5487 #if defined(CONFIG_NFS_V4_1)
5488         [1] = &nfs_v4_1_minor_ops,
5489 #endif
5490 };
5491
5492 static const struct inode_operations nfs4_file_inode_operations = {
5493         .permission     = nfs_permission,
5494         .getattr        = nfs_getattr,
5495         .setattr        = nfs_setattr,
5496         .getxattr       = nfs4_getxattr,
5497         .setxattr       = nfs4_setxattr,
5498         .listxattr      = nfs4_listxattr,
5499 };
5500
5501 const struct nfs_rpc_ops nfs_v4_clientops = {
5502         .version        = 4,                    /* protocol version */
5503         .dentry_ops     = &nfs4_dentry_operations,
5504         .dir_inode_ops  = &nfs4_dir_inode_operations,
5505         .file_inode_ops = &nfs4_file_inode_operations,
5506         .getroot        = nfs4_proc_get_root,
5507         .getattr        = nfs4_proc_getattr,
5508         .setattr        = nfs4_proc_setattr,
5509         .lookupfh       = nfs4_proc_lookupfh,
5510         .lookup         = nfs4_proc_lookup,
5511         .access         = nfs4_proc_access,
5512         .readlink       = nfs4_proc_readlink,
5513         .create         = nfs4_proc_create,
5514         .remove         = nfs4_proc_remove,
5515         .unlink_setup   = nfs4_proc_unlink_setup,
5516         .unlink_done    = nfs4_proc_unlink_done,
5517         .rename         = nfs4_proc_rename,
5518         .rename_setup   = nfs4_proc_rename_setup,
5519         .rename_done    = nfs4_proc_rename_done,
5520         .link           = nfs4_proc_link,
5521         .symlink        = nfs4_proc_symlink,
5522         .mkdir          = nfs4_proc_mkdir,
5523         .rmdir          = nfs4_proc_remove,
5524         .readdir        = nfs4_proc_readdir,
5525         .mknod          = nfs4_proc_mknod,
5526         .statfs         = nfs4_proc_statfs,
5527         .fsinfo         = nfs4_proc_fsinfo,
5528         .pathconf       = nfs4_proc_pathconf,
5529         .set_capabilities = nfs4_server_capabilities,
5530         .decode_dirent  = nfs4_decode_dirent,
5531         .read_setup     = nfs4_proc_read_setup,
5532         .read_done      = nfs4_read_done,
5533         .write_setup    = nfs4_proc_write_setup,
5534         .write_done     = nfs4_write_done,
5535         .commit_setup   = nfs4_proc_commit_setup,
5536         .commit_done    = nfs4_commit_done,
5537         .lock           = nfs4_proc_lock,
5538         .clear_acl_cache = nfs4_zap_acl_attr,
5539         .close_context  = nfs4_close_context,
5540         .open_context   = nfs4_atomic_open,
5541 };
5542
5543 /*
5544  * Local variables:
5545  *  c-basic-offset: 8
5546  * End:
5547  */