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 #include <linux/xattr.h>
  53
  54 #include "nfs4_fs.h"
  55 #include "delegation.h"
  56 #include "internal.h"
  57 #include "iostat.h"
  58 #include "callback.h"
  59 #include "pnfs.h"
  60
  61 #define NFSDBG_FACILITY         NFSDBG_PROC
  62
  63 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  64 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  65
  66 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  67
  68 struct nfs4_opendata;
  69 static int _nfs4_proc_open(struct nfs4_opendata *data);
  70 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  71 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  72 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  73 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  74 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  75 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  76                             struct nfs_fattr *fattr, struct iattr *sattr,
  77                             struct nfs4_state *state);
  78
  79 /* Prevent leaks of NFSv4 errors into userland */
  80 static int nfs4_map_errors(int err)
  81 {
  82         if (err >= -1000)
  83                 return err;
  84         switch (err) {
  85         case -NFS4ERR_RESOURCE:
  86                 return -EREMOTEIO;
  87         default:
  88                 dprintk("%s could not handle NFSv4 error %d\n",
  89                                 __func__, -err);
  90                 break;
  91         }
  92         return -EIO;
  93 }
  94
  95 /*
  96  * This is our standard bitmap for GETATTR requests.
  97  */
  98 const u32 nfs4_fattr_bitmap[2] = {
  99         FATTR4_WORD0_TYPE
 100         | FATTR4_WORD0_CHANGE
 101         | FATTR4_WORD0_SIZE
 102         | FATTR4_WORD0_FSID
 103         | FATTR4_WORD0_FILEID,
 104         FATTR4_WORD1_MODE
 105         | FATTR4_WORD1_NUMLINKS
 106         | FATTR4_WORD1_OWNER
 107         | FATTR4_WORD1_OWNER_GROUP
 108         | FATTR4_WORD1_RAWDEV
 109         | FATTR4_WORD1_SPACE_USED
 110         | FATTR4_WORD1_TIME_ACCESS
 111         | FATTR4_WORD1_TIME_METADATA
 112         | FATTR4_WORD1_TIME_MODIFY
 113 };
 114
 115 const u32 nfs4_statfs_bitmap[2] = {
 116         FATTR4_WORD0_FILES_AVAIL
 117         | FATTR4_WORD0_FILES_FREE
 118         | FATTR4_WORD0_FILES_TOTAL,
 119         FATTR4_WORD1_SPACE_AVAIL
 120         | FATTR4_WORD1_SPACE_FREE
 121         | FATTR4_WORD1_SPACE_TOTAL
 122 };
 123
 124 const u32 nfs4_pathconf_bitmap[2] = {
 125         FATTR4_WORD0_MAXLINK
 126         | FATTR4_WORD0_MAXNAME,
 127         0
 128 };
 129
 130 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 131                         | FATTR4_WORD0_MAXREAD
 132                         | FATTR4_WORD0_MAXWRITE
 133                         | FATTR4_WORD0_LEASE_TIME,
 134                         FATTR4_WORD1_TIME_DELTA
 135                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 136 };
 137
 138 const u32 nfs4_fs_locations_bitmap[2] = {
 139         FATTR4_WORD0_TYPE
 140         | FATTR4_WORD0_CHANGE
 141         | FATTR4_WORD0_SIZE
 142         | FATTR4_WORD0_FSID
 143         | FATTR4_WORD0_FILEID
 144         | FATTR4_WORD0_FS_LOCATIONS,
 145         FATTR4_WORD1_MODE
 146         | FATTR4_WORD1_NUMLINKS
 147         | FATTR4_WORD1_OWNER
 148         | FATTR4_WORD1_OWNER_GROUP
 149         | FATTR4_WORD1_RAWDEV
 150         | FATTR4_WORD1_SPACE_USED
 151         | FATTR4_WORD1_TIME_ACCESS
 152         | FATTR4_WORD1_TIME_METADATA
 153         | FATTR4_WORD1_TIME_MODIFY
 154         | FATTR4_WORD1_MOUNTED_ON_FILEID
 155 };
 156
 157 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 158                 struct nfs4_readdir_arg *readdir)
 159 {
 160         __be32 *start, *p;
 161
 162         BUG_ON(readdir->count < 80);
 163         if (cookie > 2) {
 164                 readdir->cookie = cookie;
 165                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 166                 return;
 167         }
 168
 169         readdir->cookie = 0;
 170         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 171         if (cookie == 2)
 172                 return;
 173
 174         /*
 175          * NFSv4 servers do not return entries for '.' and '..'
 176          * Therefore, we fake these entries here.  We let '.'
 177          * have cookie 0 and '..' have cookie 1.  Note that
 178          * when talking to the server, we always send cookie 0
 179          * instead of 1 or 2.
 180          */
 181         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 182
 183         if (cookie == 0) {
 184                 *p++ = xdr_one;                                  /* next */
 185                 *p++ = xdr_zero;                   /* cookie, first word */
 186                 *p++ = xdr_one;                   /* cookie, second word */
 187                 *p++ = xdr_one;                             /* entry len */
 188                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 189                 p++;
 190                 *p++ = xdr_one;                         /* bitmap length */
 191                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 192                 *p++ = htonl(8);              /* attribute buffer length */
 193                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 194         }
 195
 196         *p++ = xdr_one;                                  /* next */
 197         *p++ = xdr_zero;                   /* cookie, first word */
 198         *p++ = xdr_two;                   /* cookie, second word */
 199         *p++ = xdr_two;                             /* entry len */
 200         memcpy(p, "..\0\0", 4);                         /* entry */
 201         p++;
 202         *p++ = xdr_one;                         /* bitmap length */
 203         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 204         *p++ = htonl(8);              /* attribute buffer length */
 205         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 206
 207         readdir->pgbase = (char *)p - (char *)start;
 208         readdir->count -= readdir->pgbase;
 209         kunmap_atomic(start, KM_USER0);
 210 }
 211
 212 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 213 {
 214         int res;
 215
 216         might_sleep();
 217
 218         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 219                         nfs_wait_bit_killable, TASK_KILLABLE);
 220         return res;
 221 }
 222
 223 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 224 {
 225         int res = 0;
 226
 227         might_sleep();
 228
 229         if (*timeout <= 0)
 230                 *timeout = NFS4_POLL_RETRY_MIN;
 231         if (*timeout > NFS4_POLL_RETRY_MAX)
 232                 *timeout = NFS4_POLL_RETRY_MAX;
 233         schedule_timeout_killable(*timeout);
 234         if (fatal_signal_pending(current))
 235                 res = -ERESTARTSYS;
 236         *timeout <<= 1;
 237         return res;
 238 }
 239
 240 /* This is the error handling routine for processes that are allowed
 241  * to sleep.
 242  */
 243 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 244 {
 245         struct nfs_client *clp = server->nfs_client;
 246         struct nfs4_state *state = exception->state;
 247         int ret = errorcode;
 248
 249         exception->retry = 0;
 250         switch(errorcode) {
 251                 case 0:
 252                         return 0;
 253                 case -NFS4ERR_ADMIN_REVOKED:
 254                 case -NFS4ERR_BAD_STATEID:
 255                 case -NFS4ERR_OPENMODE:
 256                         if (state == NULL)
 257                                 break;
 258                         nfs4_state_mark_reclaim_nograce(clp, state);
 259                         goto do_state_recovery;
 260                 case -NFS4ERR_STALE_STATEID:
 261                 case -NFS4ERR_STALE_CLIENTID:
 262                 case -NFS4ERR_EXPIRED:
 263                         goto do_state_recovery;
 264 #if defined(CONFIG_NFS_V4_1)
 265                 case -NFS4ERR_BADSESSION:
 266                 case -NFS4ERR_BADSLOT:
 267                 case -NFS4ERR_BAD_HIGH_SLOT:
 268                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 269                 case -NFS4ERR_DEADSESSION:
 270                 case -NFS4ERR_SEQ_FALSE_RETRY:
 271                 case -NFS4ERR_SEQ_MISORDERED:
 272                         dprintk("%s ERROR: %d Reset session\n", __func__,
 273                                 errorcode);
 274                         nfs4_schedule_state_recovery(clp);
 275                         exception->retry = 1;
 276                         break;
 277 #endif /* defined(CONFIG_NFS_V4_1) */
 278                 case -NFS4ERR_FILE_OPEN:
 279                         if (exception->timeout > HZ) {
 280                                 /* We have retried a decent amount, time to
 281                                  * fail
 282                                  */
 283                                 ret = -EBUSY;
 284                                 break;
 285                         }
 286                 case -NFS4ERR_GRACE:
 287                 case -NFS4ERR_DELAY:
 288                 case -EKEYEXPIRED:
 289                         ret = nfs4_delay(server->client, &exception->timeout);
 290                         if (ret != 0)
 291                                 break;
 292                 case -NFS4ERR_OLD_STATEID:
 293                         exception->retry = 1;
 294         }
 295         /* We failed to handle the error */
 296         return nfs4_map_errors(ret);
 297 do_state_recovery:
 298         nfs4_schedule_state_recovery(clp);
 299         ret = nfs4_wait_clnt_recover(clp);
 300         if (ret == 0)
 301                 exception->retry = 1;
 302         return ret;
 303 }
 304
 305
 306 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 307 {
 308         spin_lock(&clp->cl_lock);
 309         if (time_before(clp->cl_last_renewal,timestamp))
 310                 clp->cl_last_renewal = timestamp;
 311         spin_unlock(&clp->cl_lock);
 312 }
 313
 314 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 315 {
 316         do_renew_lease(server->nfs_client, timestamp);
 317 }
 318
 319 #if defined(CONFIG_NFS_V4_1)
 320
 321 /*
 322  * nfs4_free_slot - free a slot and efficiently update slot table.
 323  *
 324  * freeing a slot is trivially done by clearing its respective bit
 325  * in the bitmap.
 326  * If the freed slotid equals highest_used_slotid we want to update it
 327  * so that the server would be able to size down the slot table if needed,
 328  * otherwise we know that the highest_used_slotid is still in use.
 329  * When updating highest_used_slotid there may be "holes" in the bitmap
 330  * so we need to scan down from highest_used_slotid to 0 looking for the now
 331  * highest slotid in use.
 332  * If none found, highest_used_slotid is set to -1.
 333  *
 334  * Must be called while holding tbl->slot_tbl_lock
 335  */
 336 static void
 337 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 338 {
 339         int free_slotid = free_slot - tbl->slots;
 340         int slotid = free_slotid;
 341
 342         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 343         /* clear used bit in bitmap */
 344         __clear_bit(slotid, tbl->used_slots);
 345
 346         /* update highest_used_slotid when it is freed */
 347         if (slotid == tbl->highest_used_slotid) {
 348                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 349                 if (slotid < tbl->max_slots)
 350                         tbl->highest_used_slotid = slotid;
 351                 else
 352                         tbl->highest_used_slotid = -1;
 353         }
 354         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 355                 free_slotid, tbl->highest_used_slotid);
 356 }
 357
 358 /*
 359  * Signal state manager thread if session fore channel is drained
 360  */
 361 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 362 {
 363         struct rpc_task *task;
 364
 365         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 366                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 367                 if (task)
 368                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 369                 return;
 370         }
 371
 372         if (ses->fc_slot_table.highest_used_slotid != -1)
 373                 return;
 374
 375         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 376         complete(&ses->fc_slot_table.complete);
 377 }
 378
 379 /*
 380  * Signal state manager thread if session back channel is drained
 381  */
 382 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 383 {
 384         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 385             ses->bc_slot_table.highest_used_slotid != -1)
 386                 return;
 387         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 388         complete(&ses->bc_slot_table.complete);
 389 }
 390
 391 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 392 {
 393         struct nfs4_slot_table *tbl;
 394
 395         tbl = &res->sr_session->fc_slot_table;
 396         if (!res->sr_slot) {
 397                 /* just wake up the next guy waiting since
 398                  * we may have not consumed a slot after all */
 399                 dprintk("%s: No slot\n", __func__);
 400                 return;
 401         }
 402
 403         spin_lock(&tbl->slot_tbl_lock);
 404         nfs4_free_slot(tbl, res->sr_slot);
 405         nfs4_check_drain_fc_complete(res->sr_session);
 406         spin_unlock(&tbl->slot_tbl_lock);
 407         res->sr_slot = NULL;
 408 }
 409
 410 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 411 {
 412         unsigned long timestamp;
 413         struct nfs_client *clp;
 414
 415         /*
 416          * sr_status remains 1 if an RPC level error occurred. The server
 417          * may or may not have processed the sequence operation..
 418          * Proceed as if the server received and processed the sequence
 419          * operation.
 420          */
 421         if (res->sr_status == 1)
 422                 res->sr_status = NFS_OK;
 423
 424         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 425         if (!res->sr_slot)
 426                 goto out;
 427
 428         /* Check the SEQUENCE operation status */
 429         switch (res->sr_status) {
 430         case 0:
 431                 /* Update the slot's sequence and clientid lease timer */
 432                 ++res->sr_slot->seq_nr;
 433                 timestamp = res->sr_renewal_time;
 434                 clp = res->sr_session->clp;
 435                 do_renew_lease(clp, timestamp);
 436                 /* Check sequence flags */
 437                 if (atomic_read(&clp->cl_count) > 1)
 438                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 439                 break;
 440         case -NFS4ERR_DELAY:
 441                 /* The server detected a resend of the RPC call and
 442                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 443                  * of RFC5661.
 444                  */
 445                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 446                         __func__,
 447                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 448                         res->sr_slot->seq_nr);
 449                 goto out_retry;
 450         default:
 451                 /* Just update the slot sequence no. */
 452                 ++res->sr_slot->seq_nr;
 453         }
 454 out:
 455         /* The session may be reset by one of the error handlers. */
 456         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 457         nfs41_sequence_free_slot(res);
 458         return 1;
 459 out_retry:
 460         if (!rpc_restart_call(task))
 461                 goto out;
 462         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 463         return 0;
 464 }
 465
 466 static int nfs4_sequence_done(struct rpc_task *task,
 467                                struct nfs4_sequence_res *res)
 468 {
 469         if (res->sr_session == NULL)
 470                 return 1;
 471         return nfs41_sequence_done(task, res);
 472 }
 473
 474 /*
 475  * nfs4_find_slot - efficiently look for a free slot
 476  *
 477  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 478  * If found, we mark the slot as used, update the highest_used_slotid,
 479  * and respectively set up the sequence operation args.
 480  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 481  *
 482  * Note: must be called with under the slot_tbl_lock.
 483  */
 484 static u8
 485 nfs4_find_slot(struct nfs4_slot_table *tbl)
 486 {
 487         int slotid;
 488         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 489         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 490
 491         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 492                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 493                 tbl->max_slots);
 494         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 495         if (slotid >= tbl->max_slots)
 496                 goto out;
 497         __set_bit(slotid, tbl->used_slots);
 498         if (slotid > tbl->highest_used_slotid)
 499                 tbl->highest_used_slotid = slotid;
 500         ret_id = slotid;
 501 out:
 502         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 503                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 504         return ret_id;
 505 }
 506
 507 static int nfs41_setup_sequence(struct nfs4_session *session,
 508                                 struct nfs4_sequence_args *args,
 509                                 struct nfs4_sequence_res *res,
 510                                 int cache_reply,
 511                                 struct rpc_task *task)
 512 {
 513         struct nfs4_slot *slot;
 514         struct nfs4_slot_table *tbl;
 515         u8 slotid;
 516
 517         dprintk("--> %s\n", __func__);
 518         /* slot already allocated? */
 519         if (res->sr_slot != NULL)
 520                 return 0;
 521
 522         tbl = &session->fc_slot_table;
 523
 524         spin_lock(&tbl->slot_tbl_lock);
 525         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 526             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 527                 /*
 528                  * The state manager will wait until the slot table is empty.
 529                  * Schedule the reset thread
 530                  */
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532                 spin_unlock(&tbl->slot_tbl_lock);
 533                 dprintk("%s Schedule Session Reset\n", __func__);
 534                 return -EAGAIN;
 535         }
 536
 537         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 538             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 539                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 540                 spin_unlock(&tbl->slot_tbl_lock);
 541                 dprintk("%s enforce FIFO order\n", __func__);
 542                 return -EAGAIN;
 543         }
 544
 545         slotid = nfs4_find_slot(tbl);
 546         if (slotid == NFS4_MAX_SLOT_TABLE) {
 547                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 548                 spin_unlock(&tbl->slot_tbl_lock);
 549                 dprintk("<-- %s: no free slots\n", __func__);
 550                 return -EAGAIN;
 551         }
 552         spin_unlock(&tbl->slot_tbl_lock);
 553
 554         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 555         slot = tbl->slots + slotid;
 556         args->sa_session = session;
 557         args->sa_slotid = slotid;
 558         args->sa_cache_this = cache_reply;
 559
 560         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 561
 562         res->sr_session = session;
 563         res->sr_slot = slot;
 564         res->sr_renewal_time = jiffies;
 565         res->sr_status_flags = 0;
 566         /*
 567          * sr_status is only set in decode_sequence, and so will remain
 568          * set to 1 if an rpc level failure occurs.
 569          */
 570         res->sr_status = 1;
 571         return 0;
 572 }
 573
 574 int nfs4_setup_sequence(const struct nfs_server *server,
 575                         struct nfs4_sequence_args *args,
 576                         struct nfs4_sequence_res *res,
 577                         int cache_reply,
 578                         struct rpc_task *task)
 579 {
 580         struct nfs4_session *session = nfs4_get_session(server);
 581         int ret = 0;
 582
 583         if (session == NULL) {
 584                 args->sa_session = NULL;
 585                 res->sr_session = NULL;
 586                 goto out;
 587         }
 588
 589         dprintk("--> %s clp %p session %p sr_slot %td\n",
 590                 __func__, session->clp, session, res->sr_slot ?
 591                         res->sr_slot - session->fc_slot_table.slots : -1);
 592
 593         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 594                                    task);
 595 out:
 596         dprintk("<-- %s status=%d\n", __func__, ret);
 597         return ret;
 598 }
 599
 600 struct nfs41_call_sync_data {
 601         const struct nfs_server *seq_server;
 602         struct nfs4_sequence_args *seq_args;
 603         struct nfs4_sequence_res *seq_res;
 604         int cache_reply;
 605 };
 606
 607 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 608 {
 609         struct nfs41_call_sync_data *data = calldata;
 610
 611         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 612
 613         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 614                                 data->seq_res, data->cache_reply, task))
 615                 return;
 616         rpc_call_start(task);
 617 }
 618
 619 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 620 {
 621         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 622         nfs41_call_sync_prepare(task, calldata);
 623 }
 624
 625 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 626 {
 627         struct nfs41_call_sync_data *data = calldata;
 628
 629         nfs41_sequence_done(task, data->seq_res);
 630 }
 631
 632 struct rpc_call_ops nfs41_call_sync_ops = {
 633         .rpc_call_prepare = nfs41_call_sync_prepare,
 634         .rpc_call_done = nfs41_call_sync_done,
 635 };
 636
 637 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 638         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 639         .rpc_call_done = nfs41_call_sync_done,
 640 };
 641
 642 static int nfs4_call_sync_sequence(struct nfs_server *server,
 643                                    struct rpc_message *msg,
 644                                    struct nfs4_sequence_args *args,
 645                                    struct nfs4_sequence_res *res,
 646                                    int cache_reply,
 647                                    int privileged)
 648 {
 649         int ret;
 650         struct rpc_task *task;
 651         struct nfs41_call_sync_data data = {
 652                 .seq_server = server,
 653                 .seq_args = args,
 654                 .seq_res = res,
 655                 .cache_reply = cache_reply,
 656         };
 657         struct rpc_task_setup task_setup = {
 658                 .rpc_client = server->client,
 659                 .rpc_message = msg,
 660                 .callback_ops = &nfs41_call_sync_ops,
 661                 .callback_data = &data
 662         };
 663
 664         res->sr_slot = NULL;
 665         if (privileged)
 666                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 667         task = rpc_run_task(&task_setup);
 668         if (IS_ERR(task))
 669                 ret = PTR_ERR(task);
 670         else {
 671                 ret = task->tk_status;
 672                 rpc_put_task(task);
 673         }
 674         return ret;
 675 }
 676
 677 int _nfs4_call_sync_session(struct nfs_server *server,
 678                             struct rpc_message *msg,
 679                             struct nfs4_sequence_args *args,
 680                             struct nfs4_sequence_res *res,
 681                             int cache_reply)
 682 {
 683         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 684 }
 685
 686 #else
 687 static int nfs4_sequence_done(struct rpc_task *task,
 688                                struct nfs4_sequence_res *res)
 689 {
 690         return 1;
 691 }
 692 #endif /* CONFIG_NFS_V4_1 */
 693
 694 int _nfs4_call_sync(struct nfs_server *server,
 695                     struct rpc_message *msg,
 696                     struct nfs4_sequence_args *args,
 697                     struct nfs4_sequence_res *res,
 698                     int cache_reply)
 699 {
 700         args->sa_session = res->sr_session = NULL;
 701         return rpc_call_sync(server->client, msg, 0);
 702 }
 703
 704 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 705         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 706                         &(res)->seq_res, (cache_reply))
 707
 708 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 709 {
 710         struct nfs_inode *nfsi = NFS_I(dir);
 711
 712         spin_lock(&dir->i_lock);
 713         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 714         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 715                 nfs_force_lookup_revalidate(dir);
 716         nfsi->change_attr = cinfo->after;
 717         spin_unlock(&dir->i_lock);
 718 }
 719
 720 struct nfs4_opendata {
 721         struct kref kref;
 722         struct nfs_openargs o_arg;
 723         struct nfs_openres o_res;
 724         struct nfs_open_confirmargs c_arg;
 725         struct nfs_open_confirmres c_res;
 726         struct nfs_fattr f_attr;
 727         struct nfs_fattr dir_attr;
 728         struct path path;
 729         struct dentry *dir;
 730         struct nfs4_state_owner *owner;
 731         struct nfs4_state *state;
 732         struct iattr attrs;
 733         unsigned long timestamp;
 734         unsigned int rpc_done : 1;
 735         int rpc_status;
 736         int cancelled;
 737 };
 738
 739
 740 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 741 {
 742         p->o_res.f_attr = &p->f_attr;
 743         p->o_res.dir_attr = &p->dir_attr;
 744         p->o_res.seqid = p->o_arg.seqid;
 745         p->c_res.seqid = p->c_arg.seqid;
 746         p->o_res.server = p->o_arg.server;
 747         nfs_fattr_init(&p->f_attr);
 748         nfs_fattr_init(&p->dir_attr);
 749 }
 750
 751 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 752                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 753                 const struct iattr *attrs,
 754                 gfp_t gfp_mask)
 755 {
 756         struct dentry *parent = dget_parent(path->dentry);
 757         struct inode *dir = parent->d_inode;
 758         struct nfs_server *server = NFS_SERVER(dir);
 759         struct nfs4_opendata *p;
 760
 761         p = kzalloc(sizeof(*p), gfp_mask);
 762         if (p == NULL)
 763                 goto err;
 764         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 765         if (p->o_arg.seqid == NULL)
 766                 goto err_free;
 767         path_get(path);
 768         p->path = *path;
 769         p->dir = parent;
 770         p->owner = sp;
 771         atomic_inc(&sp->so_count);
 772         p->o_arg.fh = NFS_FH(dir);
 773         p->o_arg.open_flags = flags;
 774         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 775         p->o_arg.clientid = server->nfs_client->cl_clientid;
 776         p->o_arg.id = sp->so_owner_id.id;
 777         p->o_arg.name = &p->path.dentry->d_name;
 778         p->o_arg.server = server;
 779         p->o_arg.bitmask = server->attr_bitmask;
 780         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 781         if (flags & O_CREAT) {
 782                 u32 *s;
 783
 784                 p->o_arg.u.attrs = &p->attrs;
 785                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 786                 s = (u32 *) p->o_arg.u.verifier.data;
 787                 s[0] = jiffies;
 788                 s[1] = current->pid;
 789         }
 790         p->c_arg.fh = &p->o_res.fh;
 791         p->c_arg.stateid = &p->o_res.stateid;
 792         p->c_arg.seqid = p->o_arg.seqid;
 793         nfs4_init_opendata_res(p);
 794         kref_init(&p->kref);
 795         return p;
 796 err_free:
 797         kfree(p);
 798 err:
 799         dput(parent);
 800         return NULL;
 801 }
 802
 803 static void nfs4_opendata_free(struct kref *kref)
 804 {
 805         struct nfs4_opendata *p = container_of(kref,
 806                         struct nfs4_opendata, kref);
 807
 808         nfs_free_seqid(p->o_arg.seqid);
 809         if (p->state != NULL)
 810                 nfs4_put_open_state(p->state);
 811         nfs4_put_state_owner(p->owner);
 812         dput(p->dir);
 813         path_put(&p->path);
 814         kfree(p);
 815 }
 816
 817 static void nfs4_opendata_put(struct nfs4_opendata *p)
 818 {
 819         if (p != NULL)
 820                 kref_put(&p->kref, nfs4_opendata_free);
 821 }
 822
 823 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 824 {
 825         int ret;
 826
 827         ret = rpc_wait_for_completion_task(task);
 828         return ret;
 829 }
 830
 831 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 832 {
 833         int ret = 0;
 834
 835         if (open_mode & O_EXCL)
 836                 goto out;
 837         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 838                 case FMODE_READ:
 839                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 840                                 && state->n_rdonly != 0;
 841                         break;
 842                 case FMODE_WRITE:
 843                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 844                                 && state->n_wronly != 0;
 845                         break;
 846                 case FMODE_READ|FMODE_WRITE:
 847                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 848                                 && state->n_rdwr != 0;
 849         }
 850 out:
 851         return ret;
 852 }
 853
 854 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 855 {
 856         if ((delegation->type & fmode) != fmode)
 857                 return 0;
 858         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 859                 return 0;
 860         nfs_mark_delegation_referenced(delegation);
 861         return 1;
 862 }
 863
 864 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 865 {
 866         switch (fmode) {
 867                 case FMODE_WRITE:
 868                         state->n_wronly++;
 869                         break;
 870                 case FMODE_READ:
 871                         state->n_rdonly++;
 872                         break;
 873                 case FMODE_READ|FMODE_WRITE:
 874                         state->n_rdwr++;
 875         }
 876         nfs4_state_set_mode_locked(state, state->state | fmode);
 877 }
 878
 879 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 880 {
 881         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 882                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 883         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 884         switch (fmode) {
 885                 case FMODE_READ:
 886                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 887                         break;
 888                 case FMODE_WRITE:
 889                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 890                         break;
 891                 case FMODE_READ|FMODE_WRITE:
 892                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 893         }
 894 }
 895
 896 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 897 {
 898         write_seqlock(&state->seqlock);
 899         nfs_set_open_stateid_locked(state, stateid, fmode);
 900         write_sequnlock(&state->seqlock);
 901 }
 902
 903 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 904 {
 905         /*
 906          * Protect the call to nfs4_state_set_mode_locked and
 907          * serialise the stateid update
 908          */
 909         write_seqlock(&state->seqlock);
 910         if (deleg_stateid != NULL) {
 911                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 912                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 913         }
 914         if (open_stateid != NULL)
 915                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 916         write_sequnlock(&state->seqlock);
 917         spin_lock(&state->owner->so_lock);
 918         update_open_stateflags(state, fmode);
 919         spin_unlock(&state->owner->so_lock);
 920 }
 921
 922 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 923 {
 924         struct nfs_inode *nfsi = NFS_I(state->inode);
 925         struct nfs_delegation *deleg_cur;
 926         int ret = 0;
 927
 928         fmode &= (FMODE_READ|FMODE_WRITE);
 929
 930         rcu_read_lock();
 931         deleg_cur = rcu_dereference(nfsi->delegation);
 932         if (deleg_cur == NULL)
 933                 goto no_delegation;
 934
 935         spin_lock(&deleg_cur->lock);
 936         if (nfsi->delegation != deleg_cur ||
 937             (deleg_cur->type & fmode) != fmode)
 938                 goto no_delegation_unlock;
 939
 940         if (delegation == NULL)
 941                 delegation = &deleg_cur->stateid;
 942         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 943                 goto no_delegation_unlock;
 944
 945         nfs_mark_delegation_referenced(deleg_cur);
 946         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 947         ret = 1;
 948 no_delegation_unlock:
 949         spin_unlock(&deleg_cur->lock);
 950 no_delegation:
 951         rcu_read_unlock();
 952
 953         if (!ret && open_stateid != NULL) {
 954                 __update_open_stateid(state, open_stateid, NULL, fmode);
 955                 ret = 1;
 956         }
 957
 958         return ret;
 959 }
 960
 961
 962 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 963 {
 964         struct nfs_delegation *delegation;
 965
 966         rcu_read_lock();
 967         delegation = rcu_dereference(NFS_I(inode)->delegation);
 968         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 969                 rcu_read_unlock();
 970                 return;
 971         }
 972         rcu_read_unlock();
 973         nfs_inode_return_delegation(inode);
 974 }
 975
 976 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 977 {
 978         struct nfs4_state *state = opendata->state;
 979         struct nfs_inode *nfsi = NFS_I(state->inode);
 980         struct nfs_delegation *delegation;
 981         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 982         fmode_t fmode = opendata->o_arg.fmode;
 983         nfs4_stateid stateid;
 984         int ret = -EAGAIN;
 985
 986         for (;;) {
 987                 if (can_open_cached(state, fmode, open_mode)) {
 988                         spin_lock(&state->owner->so_lock);
 989                         if (can_open_cached(state, fmode, open_mode)) {
 990                                 update_open_stateflags(state, fmode);
 991                                 spin_unlock(&state->owner->so_lock);
 992                                 goto out_return_state;
 993                         }
 994                         spin_unlock(&state->owner->so_lock);
 995                 }
 996                 rcu_read_lock();
 997                 delegation = rcu_dereference(nfsi->delegation);
 998                 if (delegation == NULL ||
 999                     !can_open_delegated(delegation, fmode)) {
1000                         rcu_read_unlock();
1001                         break;
1002                 }
1003                 /* Save the delegation */
1004                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1005                 rcu_read_unlock();
1006                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1007                 if (ret != 0)
1008                         goto out;
1009                 ret = -EAGAIN;
1010
1011                 /* Try to update the stateid using the delegation */
1012                 if (update_open_stateid(state, NULL, &stateid, fmode))
1013                         goto out_return_state;
1014         }
1015 out:
1016         return ERR_PTR(ret);
1017 out_return_state:
1018         atomic_inc(&state->count);
1019         return state;
1020 }
1021
1022 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1023 {
1024         struct inode *inode;
1025         struct nfs4_state *state = NULL;
1026         struct nfs_delegation *delegation;
1027         int ret;
1028
1029         if (!data->rpc_done) {
1030                 state = nfs4_try_open_cached(data);
1031                 goto out;
1032         }
1033
1034         ret = -EAGAIN;
1035         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1036                 goto err;
1037         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1038         ret = PTR_ERR(inode);
1039         if (IS_ERR(inode))
1040                 goto err;
1041         ret = -ENOMEM;
1042         state = nfs4_get_open_state(inode, data->owner);
1043         if (state == NULL)
1044                 goto err_put_inode;
1045         if (data->o_res.delegation_type != 0) {
1046                 int delegation_flags = 0;
1047
1048                 rcu_read_lock();
1049                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1050                 if (delegation)
1051                         delegation_flags = delegation->flags;
1052                 rcu_read_unlock();
1053                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1054                         nfs_inode_set_delegation(state->inode,
1055                                         data->owner->so_cred,
1056                                         &data->o_res);
1057                 else
1058                         nfs_inode_reclaim_delegation(state->inode,
1059                                         data->owner->so_cred,
1060                                         &data->o_res);
1061         }
1062
1063         update_open_stateid(state, &data->o_res.stateid, NULL,
1064                         data->o_arg.fmode);
1065         iput(inode);
1066 out:
1067         return state;
1068 err_put_inode:
1069         iput(inode);
1070 err:
1071         return ERR_PTR(ret);
1072 }
1073
1074 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1075 {
1076         struct nfs_inode *nfsi = NFS_I(state->inode);
1077         struct nfs_open_context *ctx;
1078
1079         spin_lock(&state->inode->i_lock);
1080         list_for_each_entry(ctx, &nfsi->open_files, list) {
1081                 if (ctx->state != state)
1082                         continue;
1083                 get_nfs_open_context(ctx);
1084                 spin_unlock(&state->inode->i_lock);
1085                 return ctx;
1086         }
1087         spin_unlock(&state->inode->i_lock);
1088         return ERR_PTR(-ENOENT);
1089 }
1090
1091 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1092 {
1093         struct nfs4_opendata *opendata;
1094
1095         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1096         if (opendata == NULL)
1097                 return ERR_PTR(-ENOMEM);
1098         opendata->state = state;
1099         atomic_inc(&state->count);
1100         return opendata;
1101 }
1102
1103 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1104 {
1105         struct nfs4_state *newstate;
1106         int ret;
1107
1108         opendata->o_arg.open_flags = 0;
1109         opendata->o_arg.fmode = fmode;
1110         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1111         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1112         nfs4_init_opendata_res(opendata);
1113         ret = _nfs4_recover_proc_open(opendata);
1114         if (ret != 0)
1115                 return ret;
1116         newstate = nfs4_opendata_to_nfs4_state(opendata);
1117         if (IS_ERR(newstate))
1118                 return PTR_ERR(newstate);
1119         nfs4_close_state(&opendata->path, newstate, fmode);
1120         *res = newstate;
1121         return 0;
1122 }
1123
1124 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1125 {
1126         struct nfs4_state *newstate;
1127         int ret;
1128
1129         /* memory barrier prior to reading state->n_* */
1130         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1131         smp_rmb();
1132         if (state->n_rdwr != 0) {
1133                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1134                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1135                 if (ret != 0)
1136                         return ret;
1137                 if (newstate != state)
1138                         return -ESTALE;
1139         }
1140         if (state->n_wronly != 0) {
1141                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1142                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1143                 if (ret != 0)
1144                         return ret;
1145                 if (newstate != state)
1146                         return -ESTALE;
1147         }
1148         if (state->n_rdonly != 0) {
1149                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1150                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1151                 if (ret != 0)
1152                         return ret;
1153                 if (newstate != state)
1154                         return -ESTALE;
1155         }
1156         /*
1157          * We may have performed cached opens for all three recoveries.
1158          * Check if we need to update the current stateid.
1159          */
1160         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1161             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1162                 write_seqlock(&state->seqlock);
1163                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1164                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1165                 write_sequnlock(&state->seqlock);
1166         }
1167         return 0;
1168 }
1169
1170 /*
1171  * OPEN_RECLAIM:
1172  *      reclaim state on the server after a reboot.
1173  */
1174 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1175 {
1176         struct nfs_delegation *delegation;
1177         struct nfs4_opendata *opendata;
1178         fmode_t delegation_type = 0;
1179         int status;
1180
1181         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1182         if (IS_ERR(opendata))
1183                 return PTR_ERR(opendata);
1184         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1185         opendata->o_arg.fh = NFS_FH(state->inode);
1186         rcu_read_lock();
1187         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1188         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1189                 delegation_type = delegation->type;
1190         rcu_read_unlock();
1191         opendata->o_arg.u.delegation_type = delegation_type;
1192         status = nfs4_open_recover(opendata, state);
1193         nfs4_opendata_put(opendata);
1194         return status;
1195 }
1196
1197 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1198 {
1199         struct nfs_server *server = NFS_SERVER(state->inode);
1200         struct nfs4_exception exception = { };
1201         int err;
1202         do {
1203                 err = _nfs4_do_open_reclaim(ctx, state);
1204                 if (err != -NFS4ERR_DELAY)
1205                         break;
1206                 nfs4_handle_exception(server, err, &exception);
1207         } while (exception.retry);
1208         return err;
1209 }
1210
1211 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1212 {
1213         struct nfs_open_context *ctx;
1214         int ret;
1215
1216         ctx = nfs4_state_find_open_context(state);
1217         if (IS_ERR(ctx))
1218                 return PTR_ERR(ctx);
1219         ret = nfs4_do_open_reclaim(ctx, state);
1220         put_nfs_open_context(ctx);
1221         return ret;
1222 }
1223
1224 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1225 {
1226         struct nfs4_opendata *opendata;
1227         int ret;
1228
1229         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1230         if (IS_ERR(opendata))
1231                 return PTR_ERR(opendata);
1232         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1233         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1234                         sizeof(opendata->o_arg.u.delegation.data));
1235         ret = nfs4_open_recover(opendata, state);
1236         nfs4_opendata_put(opendata);
1237         return ret;
1238 }
1239
1240 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1241 {
1242         struct nfs4_exception exception = { };
1243         struct nfs_server *server = NFS_SERVER(state->inode);
1244         int err;
1245         do {
1246                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1247                 switch (err) {
1248                         case 0:
1249                         case -ENOENT:
1250                         case -ESTALE:
1251                                 goto out;
1252                         case -NFS4ERR_BADSESSION:
1253                         case -NFS4ERR_BADSLOT:
1254                         case -NFS4ERR_BAD_HIGH_SLOT:
1255                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1256                         case -NFS4ERR_DEADSESSION:
1257                                 nfs4_schedule_state_recovery(
1258                                         server->nfs_client);
1259                                 goto out;
1260                         case -NFS4ERR_STALE_CLIENTID:
1261                         case -NFS4ERR_STALE_STATEID:
1262                         case -NFS4ERR_EXPIRED:
1263                                 /* Don't recall a delegation if it was lost */
1264                                 nfs4_schedule_state_recovery(server->nfs_client);
1265                                 goto out;
1266                         case -ERESTARTSYS:
1267                                 /*
1268                                  * The show must go on: exit, but mark the
1269                                  * stateid as needing recovery.
1270                                  */
1271                         case -NFS4ERR_ADMIN_REVOKED:
1272                         case -NFS4ERR_BAD_STATEID:
1273                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1274                         case -EKEYEXPIRED:
1275                                 /*
1276                                  * User RPCSEC_GSS context has expired.
1277                                  * We cannot recover this stateid now, so
1278                                  * skip it and allow recovery thread to
1279                                  * proceed.
1280                                  */
1281                         case -ENOMEM:
1282                                 err = 0;
1283                                 goto out;
1284                 }
1285                 err = nfs4_handle_exception(server, err, &exception);
1286         } while (exception.retry);
1287 out:
1288         return err;
1289 }
1290
1291 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1292 {
1293         struct nfs4_opendata *data = calldata;
1294
1295         data->rpc_status = task->tk_status;
1296         if (data->rpc_status == 0) {
1297                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1298                                 sizeof(data->o_res.stateid.data));
1299                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1300                 renew_lease(data->o_res.server, data->timestamp);
1301                 data->rpc_done = 1;
1302         }
1303 }
1304
1305 static void nfs4_open_confirm_release(void *calldata)
1306 {
1307         struct nfs4_opendata *data = calldata;
1308         struct nfs4_state *state = NULL;
1309
1310         /* If this request hasn't been cancelled, do nothing */
1311         if (data->cancelled == 0)
1312                 goto out_free;
1313         /* In case of error, no cleanup! */
1314         if (!data->rpc_done)
1315                 goto out_free;
1316         state = nfs4_opendata_to_nfs4_state(data);
1317         if (!IS_ERR(state))
1318                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1319 out_free:
1320         nfs4_opendata_put(data);
1321 }
1322
1323 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1324         .rpc_call_done = nfs4_open_confirm_done,
1325         .rpc_release = nfs4_open_confirm_release,
1326 };
1327
1328 /*
1329  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1330  */
1331 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1332 {
1333         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1334         struct rpc_task *task;
1335         struct  rpc_message msg = {
1336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1337                 .rpc_argp = &data->c_arg,
1338                 .rpc_resp = &data->c_res,
1339                 .rpc_cred = data->owner->so_cred,
1340         };
1341         struct rpc_task_setup task_setup_data = {
1342                 .rpc_client = server->client,
1343                 .rpc_message = &msg,
1344                 .callback_ops = &nfs4_open_confirm_ops,
1345                 .callback_data = data,
1346                 .workqueue = nfsiod_workqueue,
1347                 .flags = RPC_TASK_ASYNC,
1348         };
1349         int status;
1350
1351         kref_get(&data->kref);
1352         data->rpc_done = 0;
1353         data->rpc_status = 0;
1354         data->timestamp = jiffies;
1355         task = rpc_run_task(&task_setup_data);
1356         if (IS_ERR(task))
1357                 return PTR_ERR(task);
1358         status = nfs4_wait_for_completion_rpc_task(task);
1359         if (status != 0) {
1360                 data->cancelled = 1;
1361                 smp_wmb();
1362         } else
1363                 status = data->rpc_status;
1364         rpc_put_task(task);
1365         return status;
1366 }
1367
1368 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1369 {
1370         struct nfs4_opendata *data = calldata;
1371         struct nfs4_state_owner *sp = data->owner;
1372
1373         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1374                 return;
1375         /*
1376          * Check if we still need to send an OPEN call, or if we can use
1377          * a delegation instead.
1378          */
1379         if (data->state != NULL) {
1380                 struct nfs_delegation *delegation;
1381
1382                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1383                         goto out_no_action;
1384                 rcu_read_lock();
1385                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1386                 if (delegation != NULL &&
1387                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1388                         rcu_read_unlock();
1389                         goto out_no_action;
1390                 }
1391                 rcu_read_unlock();
1392         }
1393         /* Update sequence id. */
1394         data->o_arg.id = sp->so_owner_id.id;
1395         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1396         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1397                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1398                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1399         }
1400         data->timestamp = jiffies;
1401         if (nfs4_setup_sequence(data->o_arg.server,
1402                                 &data->o_arg.seq_args,
1403                                 &data->o_res.seq_res, 1, task))
1404                 return;
1405         rpc_call_start(task);
1406         return;
1407 out_no_action:
1408         task->tk_action = NULL;
1409
1410 }
1411
1412 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1413 {
1414         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1415         nfs4_open_prepare(task, calldata);
1416 }
1417
1418 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1419 {
1420         struct nfs4_opendata *data = calldata;
1421
1422         data->rpc_status = task->tk_status;
1423
1424         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1425                 return;
1426
1427         if (task->tk_status == 0) {
1428                 switch (data->o_res.f_attr->mode & S_IFMT) {
1429                         case S_IFREG:
1430                                 break;
1431                         case S_IFLNK:
1432                                 data->rpc_status = -ELOOP;
1433                                 break;
1434                         case S_IFDIR:
1435                                 data->rpc_status = -EISDIR;
1436                                 break;
1437                         default:
1438                                 data->rpc_status = -ENOTDIR;
1439                 }
1440                 renew_lease(data->o_res.server, data->timestamp);
1441                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1442                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1443         }
1444         data->rpc_done = 1;
1445 }
1446
1447 static void nfs4_open_release(void *calldata)
1448 {
1449         struct nfs4_opendata *data = calldata;
1450         struct nfs4_state *state = NULL;
1451
1452         /* If this request hasn't been cancelled, do nothing */
1453         if (data->cancelled == 0)
1454                 goto out_free;
1455         /* In case of error, no cleanup! */
1456         if (data->rpc_status != 0 || !data->rpc_done)
1457                 goto out_free;
1458         /* In case we need an open_confirm, no cleanup! */
1459         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1460                 goto out_free;
1461         state = nfs4_opendata_to_nfs4_state(data);
1462         if (!IS_ERR(state))
1463                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1464 out_free:
1465         nfs4_opendata_put(data);
1466 }
1467
1468 static const struct rpc_call_ops nfs4_open_ops = {
1469         .rpc_call_prepare = nfs4_open_prepare,
1470         .rpc_call_done = nfs4_open_done,
1471         .rpc_release = nfs4_open_release,
1472 };
1473
1474 static const struct rpc_call_ops nfs4_recover_open_ops = {
1475         .rpc_call_prepare = nfs4_recover_open_prepare,
1476         .rpc_call_done = nfs4_open_done,
1477         .rpc_release = nfs4_open_release,
1478 };
1479
1480 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1481 {
1482         struct inode *dir = data->dir->d_inode;
1483         struct nfs_server *server = NFS_SERVER(dir);
1484         struct nfs_openargs *o_arg = &data->o_arg;
1485         struct nfs_openres *o_res = &data->o_res;
1486         struct rpc_task *task;
1487         struct rpc_message msg = {
1488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1489                 .rpc_argp = o_arg,
1490                 .rpc_resp = o_res,
1491                 .rpc_cred = data->owner->so_cred,
1492         };
1493         struct rpc_task_setup task_setup_data = {
1494                 .rpc_client = server->client,
1495                 .rpc_message = &msg,
1496                 .callback_ops = &nfs4_open_ops,
1497                 .callback_data = data,
1498                 .workqueue = nfsiod_workqueue,
1499                 .flags = RPC_TASK_ASYNC,
1500         };
1501         int status;
1502
1503         kref_get(&data->kref);
1504         data->rpc_done = 0;
1505         data->rpc_status = 0;
1506         data->cancelled = 0;
1507         if (isrecover)
1508                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1509         task = rpc_run_task(&task_setup_data);
1510         if (IS_ERR(task))
1511                 return PTR_ERR(task);
1512         status = nfs4_wait_for_completion_rpc_task(task);
1513         if (status != 0) {
1514                 data->cancelled = 1;
1515                 smp_wmb();
1516         } else
1517                 status = data->rpc_status;
1518         rpc_put_task(task);
1519
1520         return status;
1521 }
1522
1523 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1524 {
1525         struct inode *dir = data->dir->d_inode;
1526         struct nfs_openres *o_res = &data->o_res;
1527         int status;
1528
1529         status = nfs4_run_open_task(data, 1);
1530         if (status != 0 || !data->rpc_done)
1531                 return status;
1532
1533         nfs_refresh_inode(dir, o_res->dir_attr);
1534
1535         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1536                 status = _nfs4_proc_open_confirm(data);
1537                 if (status != 0)
1538                         return status;
1539         }
1540
1541         return status;
1542 }
1543
1544 /*
1545  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1546  */
1547 static int _nfs4_proc_open(struct nfs4_opendata *data)
1548 {
1549         struct inode *dir = data->dir->d_inode;
1550         struct nfs_server *server = NFS_SERVER(dir);
1551         struct nfs_openargs *o_arg = &data->o_arg;
1552         struct nfs_openres *o_res = &data->o_res;
1553         int status;
1554
1555         status = nfs4_run_open_task(data, 0);
1556         if (status != 0 || !data->rpc_done)
1557                 return status;
1558
1559         if (o_arg->open_flags & O_CREAT) {
1560                 update_changeattr(dir, &o_res->cinfo);
1561                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1562         } else
1563                 nfs_refresh_inode(dir, o_res->dir_attr);
1564         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1565                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1566         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1567                 status = _nfs4_proc_open_confirm(data);
1568                 if (status != 0)
1569                         return status;
1570         }
1571         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1572                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1573         return 0;
1574 }
1575
1576 static int nfs4_recover_expired_lease(struct nfs_server *server)
1577 {
1578         struct nfs_client *clp = server->nfs_client;
1579         unsigned int loop;
1580         int ret;
1581
1582         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1583                 ret = nfs4_wait_clnt_recover(clp);
1584                 if (ret != 0)
1585                         break;
1586                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1587                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1588                         break;
1589                 nfs4_schedule_state_recovery(clp);
1590                 ret = -EIO;
1591         }
1592         return ret;
1593 }
1594
1595 /*
1596  * OPEN_EXPIRED:
1597  *      reclaim state on the server after a network partition.
1598  *      Assumes caller holds the appropriate lock
1599  */
1600 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1601 {
1602         struct nfs4_opendata *opendata;
1603         int ret;
1604
1605         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1606         if (IS_ERR(opendata))
1607                 return PTR_ERR(opendata);
1608         ret = nfs4_open_recover(opendata, state);
1609         if (ret == -ESTALE)
1610                 d_drop(ctx->path.dentry);
1611         nfs4_opendata_put(opendata);
1612         return ret;
1613 }
1614
1615 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1616 {
1617         struct nfs_server *server = NFS_SERVER(state->inode);
1618         struct nfs4_exception exception = { };
1619         int err;
1620
1621         do {
1622                 err = _nfs4_open_expired(ctx, state);
1623                 switch (err) {
1624                 default:
1625                         goto out;
1626                 case -NFS4ERR_GRACE:
1627                 case -NFS4ERR_DELAY:
1628                         nfs4_handle_exception(server, err, &exception);
1629                         err = 0;
1630                 }
1631         } while (exception.retry);
1632 out:
1633         return err;
1634 }
1635
1636 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1637 {
1638         struct nfs_open_context *ctx;
1639         int ret;
1640
1641         ctx = nfs4_state_find_open_context(state);
1642         if (IS_ERR(ctx))
1643                 return PTR_ERR(ctx);
1644         ret = nfs4_do_open_expired(ctx, state);
1645         put_nfs_open_context(ctx);
1646         return ret;
1647 }
1648
1649 /*
1650  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1651  * fields corresponding to attributes that were used to store the verifier.
1652  * Make sure we clobber those fields in the later setattr call
1653  */
1654 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1655 {
1656         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1657             !(sattr->ia_valid & ATTR_ATIME_SET))
1658                 sattr->ia_valid |= ATTR_ATIME;
1659
1660         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1661             !(sattr->ia_valid & ATTR_MTIME_SET))
1662                 sattr->ia_valid |= ATTR_MTIME;
1663 }
1664
1665 /*
1666  * Returns a referenced nfs4_state
1667  */
1668 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)
1669 {
1670         struct nfs4_state_owner  *sp;
1671         struct nfs4_state     *state = NULL;
1672         struct nfs_server       *server = NFS_SERVER(dir);
1673         struct nfs4_opendata *opendata;
1674         int status;
1675
1676         /* Protect against reboot recovery conflicts */
1677         status = -ENOMEM;
1678         if (!(sp = nfs4_get_state_owner(server, cred))) {
1679                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1680                 goto out_err;
1681         }
1682         status = nfs4_recover_expired_lease(server);
1683         if (status != 0)
1684                 goto err_put_state_owner;
1685         if (path->dentry->d_inode != NULL)
1686                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1687         status = -ENOMEM;
1688         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1689         if (opendata == NULL)
1690                 goto err_put_state_owner;
1691
1692         if (path->dentry->d_inode != NULL)
1693                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1694
1695         status = _nfs4_proc_open(opendata);
1696         if (status != 0)
1697                 goto err_opendata_put;
1698
1699         state = nfs4_opendata_to_nfs4_state(opendata);
1700         status = PTR_ERR(state);
1701         if (IS_ERR(state))
1702                 goto err_opendata_put;
1703         if (server->caps & NFS_CAP_POSIX_LOCK)
1704                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1705
1706         if (opendata->o_arg.open_flags & O_EXCL) {
1707                 nfs4_exclusive_attrset(opendata, sattr);
1708
1709                 nfs_fattr_init(opendata->o_res.f_attr);
1710                 status = nfs4_do_setattr(state->inode, cred,
1711                                 opendata->o_res.f_attr, sattr,
1712                                 state);
1713                 if (status == 0)
1714                         nfs_setattr_update_inode(state->inode, sattr);
1715                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1716         }
1717         nfs4_opendata_put(opendata);
1718         nfs4_put_state_owner(sp);
1719         *res = state;
1720         return 0;
1721 err_opendata_put:
1722         nfs4_opendata_put(opendata);
1723 err_put_state_owner:
1724         nfs4_put_state_owner(sp);
1725 out_err:
1726         *res = NULL;
1727         return status;
1728 }
1729
1730
1731 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)
1732 {
1733         struct nfs4_exception exception = { };
1734         struct nfs4_state *res;
1735         int status;
1736
1737         do {
1738                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1739                 if (status == 0)
1740                         break;
1741                 /* NOTE: BAD_SEQID means the server and client disagree about the
1742                  * book-keeping w.r.t. state-changing operations
1743                  * (OPEN/CLOSE/LOCK/LOCKU...)
1744                  * It is actually a sign of a bug on the client or on the server.
1745                  *
1746                  * If we receive a BAD_SEQID error in the particular case of
1747                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1748                  * have unhashed the old state_owner for us, and that we can
1749                  * therefore safely retry using a new one. We should still warn
1750                  * the user though...
1751                  */
1752                 if (status == -NFS4ERR_BAD_SEQID) {
1753                         printk(KERN_WARNING "NFS: v4 server %s "
1754                                         " returned a bad sequence-id error!\n",
1755                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1756                         exception.retry = 1;
1757                         continue;
1758                 }
1759                 /*
1760                  * BAD_STATEID on OPEN means that the server cancelled our
1761                  * state before it received the OPEN_CONFIRM.
1762                  * Recover by retrying the request as per the discussion
1763                  * on Page 181 of RFC3530.
1764                  */
1765                 if (status == -NFS4ERR_BAD_STATEID) {
1766                         exception.retry = 1;
1767                         continue;
1768                 }
1769                 if (status == -EAGAIN) {
1770                         /* We must have found a delegation */
1771                         exception.retry = 1;
1772                         continue;
1773                 }
1774                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1775                                         status, &exception));
1776         } while (exception.retry);
1777         return res;
1778 }
1779
1780 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1781                             struct nfs_fattr *fattr, struct iattr *sattr,
1782                             struct nfs4_state *state)
1783 {
1784         struct nfs_server *server = NFS_SERVER(inode);
1785         struct nfs_setattrargs  arg = {
1786                 .fh             = NFS_FH(inode),
1787                 .iap            = sattr,
1788                 .server         = server,
1789                 .bitmask = server->attr_bitmask,
1790         };
1791         struct nfs_setattrres  res = {
1792                 .fattr          = fattr,
1793                 .server         = server,
1794         };
1795         struct rpc_message msg = {
1796                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1797                 .rpc_argp       = &arg,
1798                 .rpc_resp       = &res,
1799                 .rpc_cred       = cred,
1800         };
1801         unsigned long timestamp = jiffies;
1802         int status;
1803
1804         nfs_fattr_init(fattr);
1805
1806         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1807                 /* Use that stateid */
1808         } else if (state != NULL) {
1809                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1810         } else
1811                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1812
1813         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1814         if (status == 0 && state != NULL)
1815                 renew_lease(server, timestamp);
1816         return status;
1817 }
1818
1819 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1820                            struct nfs_fattr *fattr, struct iattr *sattr,
1821                            struct nfs4_state *state)
1822 {
1823         struct nfs_server *server = NFS_SERVER(inode);
1824         struct nfs4_exception exception = { };
1825         int err;
1826         do {
1827                 err = nfs4_handle_exception(server,
1828                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1829                                 &exception);
1830         } while (exception.retry);
1831         return err;
1832 }
1833
1834 struct nfs4_closedata {
1835         struct path path;
1836         struct inode *inode;
1837         struct nfs4_state *state;
1838         struct nfs_closeargs arg;
1839         struct nfs_closeres res;
1840         struct nfs_fattr fattr;
1841         unsigned long timestamp;
1842 };
1843
1844 static void nfs4_free_closedata(void *data)
1845 {
1846         struct nfs4_closedata *calldata = data;
1847         struct nfs4_state_owner *sp = calldata->state->owner;
1848
1849         nfs4_put_open_state(calldata->state);
1850         nfs_free_seqid(calldata->arg.seqid);
1851         nfs4_put_state_owner(sp);
1852         path_put(&calldata->path);
1853         kfree(calldata);
1854 }
1855
1856 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1857                 fmode_t fmode)
1858 {
1859         spin_lock(&state->owner->so_lock);
1860         if (!(fmode & FMODE_READ))
1861                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1862         if (!(fmode & FMODE_WRITE))
1863                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1864         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1865         spin_unlock(&state->owner->so_lock);
1866 }
1867
1868 static void nfs4_close_done(struct rpc_task *task, void *data)
1869 {
1870         struct nfs4_closedata *calldata = data;
1871         struct nfs4_state *state = calldata->state;
1872         struct nfs_server *server = NFS_SERVER(calldata->inode);
1873
1874         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1875                 return;
1876         /* hmm. we are done with the inode, and in the process of freeing
1877          * the state_owner. we keep this around to process errors
1878          */
1879         switch (task->tk_status) {
1880                 case 0:
1881                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1882                         renew_lease(server, calldata->timestamp);
1883                         nfs4_close_clear_stateid_flags(state,
1884                                         calldata->arg.fmode);
1885                         break;
1886                 case -NFS4ERR_STALE_STATEID:
1887                 case -NFS4ERR_OLD_STATEID:
1888                 case -NFS4ERR_BAD_STATEID:
1889                 case -NFS4ERR_EXPIRED:
1890                         if (calldata->arg.fmode == 0)
1891                                 break;
1892                 default:
1893                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1894                                 rpc_restart_call_prepare(task);
1895         }
1896         nfs_release_seqid(calldata->arg.seqid);
1897         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1898 }
1899
1900 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1901 {
1902         struct nfs4_closedata *calldata = data;
1903         struct nfs4_state *state = calldata->state;
1904         int call_close = 0;
1905
1906         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1907                 return;
1908
1909         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1910         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1911         spin_lock(&state->owner->so_lock);
1912         /* Calculate the change in open mode */
1913         if (state->n_rdwr == 0) {
1914                 if (state->n_rdonly == 0) {
1915                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1916                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1917                         calldata->arg.fmode &= ~FMODE_READ;
1918                 }
1919                 if (state->n_wronly == 0) {
1920                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1921                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1922                         calldata->arg.fmode &= ~FMODE_WRITE;
1923                 }
1924         }
1925         spin_unlock(&state->owner->so_lock);
1926
1927         if (!call_close) {
1928                 /* Note: exit _without_ calling nfs4_close_done */
1929                 task->tk_action = NULL;
1930                 return;
1931         }
1932
1933         if (calldata->arg.fmode == 0)
1934                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1935
1936         nfs_fattr_init(calldata->res.fattr);
1937         calldata->timestamp = jiffies;
1938         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1939                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1940                                 1, task))
1941                 return;
1942         rpc_call_start(task);
1943 }
1944
1945 static const struct rpc_call_ops nfs4_close_ops = {
1946         .rpc_call_prepare = nfs4_close_prepare,
1947         .rpc_call_done = nfs4_close_done,
1948         .rpc_release = nfs4_free_closedata,
1949 };
1950
1951 /*
1952  * It is possible for data to be read/written from a mem-mapped file
1953  * after the sys_close call (which hits the vfs layer as a flush).
1954  * This means that we can't safely call nfsv4 close on a file until
1955  * the inode is cleared. This in turn means that we are not good
1956  * NFSv4 citizens - we do not indicate to the server to update the file's
1957  * share state even when we are done with one of the three share
1958  * stateid's in the inode.
1959  *
1960  * NOTE: Caller must be holding the sp->so_owner semaphore!
1961  */
1962 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1963 {
1964         struct nfs_server *server = NFS_SERVER(state->inode);
1965         struct nfs4_closedata *calldata;
1966         struct nfs4_state_owner *sp = state->owner;
1967         struct rpc_task *task;
1968         struct rpc_message msg = {
1969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1970                 .rpc_cred = state->owner->so_cred,
1971         };
1972         struct rpc_task_setup task_setup_data = {
1973                 .rpc_client = server->client,
1974                 .rpc_message = &msg,
1975                 .callback_ops = &nfs4_close_ops,
1976                 .workqueue = nfsiod_workqueue,
1977                 .flags = RPC_TASK_ASYNC,
1978         };
1979         int status = -ENOMEM;
1980
1981         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1982         if (calldata == NULL)
1983                 goto out;
1984         calldata->inode = state->inode;
1985         calldata->state = state;
1986         calldata->arg.fh = NFS_FH(state->inode);
1987         calldata->arg.stateid = &state->open_stateid;
1988         /* Serialization for the sequence id */
1989         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1990         if (calldata->arg.seqid == NULL)
1991                 goto out_free_calldata;
1992         calldata->arg.fmode = 0;
1993         calldata->arg.bitmask = server->cache_consistency_bitmask;
1994         calldata->res.fattr = &calldata->fattr;
1995         calldata->res.seqid = calldata->arg.seqid;
1996         calldata->res.server = server;
1997         path_get(path);
1998         calldata->path = *path;
1999
2000         msg.rpc_argp = &calldata->arg;
2001         msg.rpc_resp = &calldata->res;
2002         task_setup_data.callback_data = calldata;
2003         task = rpc_run_task(&task_setup_data);
2004         if (IS_ERR(task))
2005                 return PTR_ERR(task);
2006         status = 0;
2007         if (wait)
2008                 status = rpc_wait_for_completion_task(task);
2009         rpc_put_task(task);
2010         return status;
2011 out_free_calldata:
2012         kfree(calldata);
2013 out:
2014         nfs4_put_open_state(state);
2015         nfs4_put_state_owner(sp);
2016         return status;
2017 }
2018
2019 static struct inode *
2020 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2021 {
2022         struct nfs4_state *state;
2023
2024         /* Protect against concurrent sillydeletes */
2025         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2026         if (IS_ERR(state))
2027                 return ERR_CAST(state);
2028         ctx->state = state;
2029         return igrab(state->inode);
2030 }
2031
2032 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2033 {
2034         if (ctx->state == NULL)
2035                 return;
2036         if (is_sync)
2037                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2038         else
2039                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2040 }
2041
2042 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2043 {
2044         struct nfs4_server_caps_arg args = {
2045                 .fhandle = fhandle,
2046         };
2047         struct nfs4_server_caps_res res = {};
2048         struct rpc_message msg = {
2049                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2050                 .rpc_argp = &args,
2051                 .rpc_resp = &res,
2052         };
2053         int status;
2054
2055         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2056         if (status == 0) {
2057                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2058                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2059                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2060                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2061                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2062                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2063                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2064                         server->caps |= NFS_CAP_ACLS;
2065                 if (res.has_links != 0)
2066                         server->caps |= NFS_CAP_HARDLINKS;
2067                 if (res.has_symlinks != 0)
2068                         server->caps |= NFS_CAP_SYMLINKS;
2069                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2070                         server->caps |= NFS_CAP_FILEID;
2071                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2072                         server->caps |= NFS_CAP_MODE;
2073                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2074                         server->caps |= NFS_CAP_NLINK;
2075                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2076                         server->caps |= NFS_CAP_OWNER;
2077                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2078                         server->caps |= NFS_CAP_OWNER_GROUP;
2079                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2080                         server->caps |= NFS_CAP_ATIME;
2081                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2082                         server->caps |= NFS_CAP_CTIME;
2083                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2084                         server->caps |= NFS_CAP_MTIME;
2085
2086                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2087                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2088                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2089                 server->acl_bitmask = res.acl_bitmask;
2090         }
2091
2092         return status;
2093 }
2094
2095 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2096 {
2097         struct nfs4_exception exception = { };
2098         int err;
2099         do {
2100                 err = nfs4_handle_exception(server,
2101                                 _nfs4_server_capabilities(server, fhandle),
2102                                 &exception);
2103         } while (exception.retry);
2104         return err;
2105 }
2106
2107 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2108                 struct nfs_fsinfo *info)
2109 {
2110         struct nfs4_lookup_root_arg args = {
2111                 .bitmask = nfs4_fattr_bitmap,
2112         };
2113         struct nfs4_lookup_res res = {
2114                 .server = server,
2115                 .fattr = info->fattr,
2116                 .fh = fhandle,
2117         };
2118         struct rpc_message msg = {
2119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2120                 .rpc_argp = &args,
2121                 .rpc_resp = &res,
2122         };
2123
2124         nfs_fattr_init(info->fattr);
2125         return nfs4_call_sync(server, &msg, &args, &res, 0);
2126 }
2127
2128 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2129                 struct nfs_fsinfo *info)
2130 {
2131         struct nfs4_exception exception = { };
2132         int err;
2133         do {
2134                 err = nfs4_handle_exception(server,
2135                                 _nfs4_lookup_root(server, fhandle, info),
2136                                 &exception);
2137         } while (exception.retry);
2138         return err;
2139 }
2140
2141 /*
2142  * get the file handle for the "/" directory on the server
2143  */
2144 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2145                               struct nfs_fsinfo *info)
2146 {
2147         int status;
2148
2149         status = nfs4_lookup_root(server, fhandle, info);
2150         if (status == 0)
2151                 status = nfs4_server_capabilities(server, fhandle);
2152         if (status == 0)
2153                 status = nfs4_do_fsinfo(server, fhandle, info);
2154         return nfs4_map_errors(status);
2155 }
2156
2157 /*
2158  * Get locations and (maybe) other attributes of a referral.
2159  * Note that we'll actually follow the referral later when
2160  * we detect fsid mismatch in inode revalidation
2161  */
2162 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2163 {
2164         int status = -ENOMEM;
2165         struct page *page = NULL;
2166         struct nfs4_fs_locations *locations = NULL;
2167
2168         page = alloc_page(GFP_KERNEL);
2169         if (page == NULL)
2170                 goto out;
2171         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2172         if (locations == NULL)
2173                 goto out;
2174
2175         status = nfs4_proc_fs_locations(dir, name, locations, page);
2176         if (status != 0)
2177                 goto out;
2178         /* Make sure server returned a different fsid for the referral */
2179         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2180                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2181                 status = -EIO;
2182                 goto out;
2183         }
2184
2185         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2186         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2187         if (!fattr->mode)
2188                 fattr->mode = S_IFDIR;
2189         memset(fhandle, 0, sizeof(struct nfs_fh));
2190 out:
2191         if (page)
2192                 __free_page(page);
2193         kfree(locations);
2194         return status;
2195 }
2196
2197 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2198 {
2199         struct nfs4_getattr_arg args = {
2200                 .fh = fhandle,
2201                 .bitmask = server->attr_bitmask,
2202         };
2203         struct nfs4_getattr_res res = {
2204                 .fattr = fattr,
2205                 .server = server,
2206         };
2207         struct rpc_message msg = {
2208                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2209                 .rpc_argp = &args,
2210                 .rpc_resp = &res,
2211         };
2212
2213         nfs_fattr_init(fattr);
2214         return nfs4_call_sync(server, &msg, &args, &res, 0);
2215 }
2216
2217 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2218 {
2219         struct nfs4_exception exception = { };
2220         int err;
2221         do {
2222                 err = nfs4_handle_exception(server,
2223                                 _nfs4_proc_getattr(server, fhandle, fattr),
2224                                 &exception);
2225         } while (exception.retry);
2226         return err;
2227 }
2228
2229 /*
2230  * The file is not closed if it is opened due to the a request to change
2231  * the size of the file. The open call will not be needed once the
2232  * VFS layer lookup-intents are implemented.
2233  *
2234  * Close is called when the inode is destroyed.
2235  * If we haven't opened the file for O_WRONLY, we
2236  * need to in the size_change case to obtain a stateid.
2237  *
2238  * Got race?
2239  * Because OPEN is always done by name in nfsv4, it is
2240  * possible that we opened a different file by the same
2241  * name.  We can recognize this race condition, but we
2242  * can't do anything about it besides returning an error.
2243  *
2244  * This will be fixed with VFS changes (lookup-intent).
2245  */
2246 static int
2247 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2248                   struct iattr *sattr)
2249 {
2250         struct inode *inode = dentry->d_inode;
2251         struct rpc_cred *cred = NULL;
2252         struct nfs4_state *state = NULL;
2253         int status;
2254
2255         nfs_fattr_init(fattr);
2256
2257         /* Search for an existing open(O_WRITE) file */
2258         if (sattr->ia_valid & ATTR_FILE) {
2259                 struct nfs_open_context *ctx;
2260
2261                 ctx = nfs_file_open_context(sattr->ia_file);
2262                 if (ctx) {
2263                         cred = ctx->cred;
2264                         state = ctx->state;
2265                 }
2266         }
2267
2268         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2269         if (status == 0)
2270                 nfs_setattr_update_inode(inode, sattr);
2271         return status;
2272 }
2273
2274 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2275                 const struct qstr *name, struct nfs_fh *fhandle,
2276                 struct nfs_fattr *fattr)
2277 {
2278         int                    status;
2279         struct nfs4_lookup_arg args = {
2280                 .bitmask = server->attr_bitmask,
2281                 .dir_fh = dirfh,
2282                 .name = name,
2283         };
2284         struct nfs4_lookup_res res = {
2285                 .server = server,
2286                 .fattr = fattr,
2287                 .fh = fhandle,
2288         };
2289         struct rpc_message msg = {
2290                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2291                 .rpc_argp = &args,
2292                 .rpc_resp = &res,
2293         };
2294
2295         nfs_fattr_init(fattr);
2296
2297         dprintk("NFS call  lookupfh %s\n", name->name);
2298         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2299         dprintk("NFS reply lookupfh: %d\n", status);
2300         return status;
2301 }
2302
2303 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2304                               struct qstr *name, struct nfs_fh *fhandle,
2305                               struct nfs_fattr *fattr)
2306 {
2307         struct nfs4_exception exception = { };
2308         int err;
2309         do {
2310                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2311                 /* FIXME: !!!! */
2312                 if (err == -NFS4ERR_MOVED) {
2313                         err = -EREMOTE;
2314                         break;
2315                 }
2316                 err = nfs4_handle_exception(server, err, &exception);
2317         } while (exception.retry);
2318         return err;
2319 }
2320
2321 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2322                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2323 {
2324         int status;
2325
2326         dprintk("NFS call  lookup %s\n", name->name);
2327         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2328         if (status == -NFS4ERR_MOVED)
2329                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2330         dprintk("NFS reply lookup: %d\n", status);
2331         return status;
2332 }
2333
2334 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2335 {
2336         struct nfs4_exception exception = { };
2337         int err;
2338         do {
2339                 err = nfs4_handle_exception(NFS_SERVER(dir),
2340                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2341                                 &exception);
2342         } while (exception.retry);
2343         return err;
2344 }
2345
2346 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2347 {
2348         struct nfs_server *server = NFS_SERVER(inode);
2349         struct nfs4_accessargs args = {
2350                 .fh = NFS_FH(inode),
2351                 .bitmask = server->attr_bitmask,
2352         };
2353         struct nfs4_accessres res = {
2354                 .server = server,
2355         };
2356         struct rpc_message msg = {
2357                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2358                 .rpc_argp = &args,
2359                 .rpc_resp = &res,
2360                 .rpc_cred = entry->cred,
2361         };
2362         int mode = entry->mask;
2363         int status;
2364
2365         /*
2366          * Determine which access bits we want to ask for...
2367          */
2368         if (mode & MAY_READ)
2369                 args.access |= NFS4_ACCESS_READ;
2370         if (S_ISDIR(inode->i_mode)) {
2371                 if (mode & MAY_WRITE)
2372                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2373                 if (mode & MAY_EXEC)
2374                         args.access |= NFS4_ACCESS_LOOKUP;
2375         } else {
2376                 if (mode & MAY_WRITE)
2377                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2378                 if (mode & MAY_EXEC)
2379                         args.access |= NFS4_ACCESS_EXECUTE;
2380         }
2381
2382         res.fattr = nfs_alloc_fattr();
2383         if (res.fattr == NULL)
2384                 return -ENOMEM;
2385
2386         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2387         if (!status) {
2388                 entry->mask = 0;
2389                 if (res.access & NFS4_ACCESS_READ)
2390                         entry->mask |= MAY_READ;
2391                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2392                         entry->mask |= MAY_WRITE;
2393                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2394                         entry->mask |= MAY_EXEC;
2395                 nfs_refresh_inode(inode, res.fattr);
2396         }
2397         nfs_free_fattr(res.fattr);
2398         return status;
2399 }
2400
2401 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2402 {
2403         struct nfs4_exception exception = { };
2404         int err;
2405         do {
2406                 err = nfs4_handle_exception(NFS_SERVER(inode),
2407                                 _nfs4_proc_access(inode, entry),
2408                                 &exception);
2409         } while (exception.retry);
2410         return err;
2411 }
2412
2413 /*
2414  * TODO: For the time being, we don't try to get any attributes
2415  * along with any of the zero-copy operations READ, READDIR,
2416  * READLINK, WRITE.
2417  *
2418  * In the case of the first three, we want to put the GETATTR
2419  * after the read-type operation -- this is because it is hard
2420  * to predict the length of a GETATTR response in v4, and thus
2421  * align the READ data correctly.  This means that the GETATTR
2422  * may end up partially falling into the page cache, and we should
2423  * shift it into the 'tail' of the xdr_buf before processing.
2424  * To do this efficiently, we need to know the total length
2425  * of data received, which doesn't seem to be available outside
2426  * of the RPC layer.
2427  *
2428  * In the case of WRITE, we also want to put the GETATTR after
2429  * the operation -- in this case because we want to make sure
2430  * we get the post-operation mtime and size.  This means that
2431  * we can't use xdr_encode_pages() as written: we need a variant
2432  * of it which would leave room in the 'tail' iovec.
2433  *
2434  * Both of these changes to the XDR layer would in fact be quite
2435  * minor, but I decided to leave them for a subsequent patch.
2436  */
2437 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2438                 unsigned int pgbase, unsigned int pglen)
2439 {
2440         struct nfs4_readlink args = {
2441                 .fh       = NFS_FH(inode),
2442                 .pgbase   = pgbase,
2443                 .pglen    = pglen,
2444                 .pages    = &page,
2445         };
2446         struct nfs4_readlink_res res;
2447         struct rpc_message msg = {
2448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2449                 .rpc_argp = &args,
2450                 .rpc_resp = &res,
2451         };
2452
2453         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2454 }
2455
2456 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2457                 unsigned int pgbase, unsigned int pglen)
2458 {
2459         struct nfs4_exception exception = { };
2460         int err;
2461         do {
2462                 err = nfs4_handle_exception(NFS_SERVER(inode),
2463                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2464                                 &exception);
2465         } while (exception.retry);
2466         return err;
2467 }
2468
2469 /*
2470  * Got race?
2471  * We will need to arrange for the VFS layer to provide an atomic open.
2472  * Until then, this create/open method is prone to inefficiency and race
2473  * conditions due to the lookup, create, and open VFS calls from sys_open()
2474  * placed on the wire.
2475  *
2476  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2477  * The file will be opened again in the subsequent VFS open call
2478  * (nfs4_proc_file_open).
2479  *
2480  * The open for read will just hang around to be used by any process that
2481  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2482  */
2483
2484 static int
2485 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2486                  int flags, struct nfs_open_context *ctx)
2487 {
2488         struct path my_path = {
2489                 .dentry = dentry,
2490         };
2491         struct path *path = &my_path;
2492         struct nfs4_state *state;
2493         struct rpc_cred *cred = NULL;
2494         fmode_t fmode = 0;
2495         int status = 0;
2496
2497         if (ctx != NULL) {
2498                 cred = ctx->cred;
2499                 path = &ctx->path;
2500                 fmode = ctx->mode;
2501         }
2502         sattr->ia_mode &= ~current_umask();
2503         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2504         d_drop(dentry);
2505         if (IS_ERR(state)) {
2506                 status = PTR_ERR(state);
2507                 goto out;
2508         }
2509         d_add(dentry, igrab(state->inode));
2510         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2511         if (ctx != NULL)
2512                 ctx->state = state;
2513         else
2514                 nfs4_close_sync(path, state, fmode);
2515 out:
2516         return status;
2517 }
2518
2519 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2520 {
2521         struct nfs_server *server = NFS_SERVER(dir);
2522         struct nfs_removeargs args = {
2523                 .fh = NFS_FH(dir),
2524                 .name.len = name->len,
2525                 .name.name = name->name,
2526                 .bitmask = server->attr_bitmask,
2527         };
2528         struct nfs_removeres res = {
2529                 .server = server,
2530         };
2531         struct rpc_message msg = {
2532                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2533                 .rpc_argp = &args,
2534                 .rpc_resp = &res,
2535         };
2536         int status = -ENOMEM;
2537
2538         res.dir_attr = nfs_alloc_fattr();
2539         if (res.dir_attr == NULL)
2540                 goto out;
2541
2542         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2543         if (status == 0) {
2544                 update_changeattr(dir, &res.cinfo);
2545                 nfs_post_op_update_inode(dir, res.dir_attr);
2546         }
2547         nfs_free_fattr(res.dir_attr);
2548 out:
2549         return status;
2550 }
2551
2552 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2553 {
2554         struct nfs4_exception exception = { };
2555         int err;
2556         do {
2557                 err = nfs4_handle_exception(NFS_SERVER(dir),
2558                                 _nfs4_proc_remove(dir, name),
2559                                 &exception);
2560         } while (exception.retry);
2561         return err;
2562 }
2563
2564 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2565 {
2566         struct nfs_server *server = NFS_SERVER(dir);
2567         struct nfs_removeargs *args = msg->rpc_argp;
2568         struct nfs_removeres *res = msg->rpc_resp;
2569
2570         args->bitmask = server->cache_consistency_bitmask;
2571         res->server = server;
2572         res->seq_res.sr_slot = NULL;
2573         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2574 }
2575
2576 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2577 {
2578         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2579
2580         if (!nfs4_sequence_done(task, &res->seq_res))
2581                 return 0;
2582         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2583                 return 0;
2584         update_changeattr(dir, &res->cinfo);
2585         nfs_post_op_update_inode(dir, res->dir_attr);
2586         return 1;
2587 }
2588
2589 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2590 {
2591         struct nfs_server *server = NFS_SERVER(dir);
2592         struct nfs_renameargs *arg = msg->rpc_argp;
2593         struct nfs_renameres *res = msg->rpc_resp;
2594
2595         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2596         arg->bitmask = server->attr_bitmask;
2597         res->server = server;
2598 }
2599
2600 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2601                                  struct inode *new_dir)
2602 {
2603         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2604
2605         if (!nfs4_sequence_done(task, &res->seq_res))
2606                 return 0;
2607         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2608                 return 0;
2609
2610         update_changeattr(old_dir, &res->old_cinfo);
2611         nfs_post_op_update_inode(old_dir, res->old_fattr);
2612         update_changeattr(new_dir, &res->new_cinfo);
2613         nfs_post_op_update_inode(new_dir, res->new_fattr);
2614         return 1;
2615 }
2616
2617 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2618                 struct inode *new_dir, struct qstr *new_name)
2619 {
2620         struct nfs_server *server = NFS_SERVER(old_dir);
2621         struct nfs_renameargs arg = {
2622                 .old_dir = NFS_FH(old_dir),
2623                 .new_dir = NFS_FH(new_dir),
2624                 .old_name = old_name,
2625                 .new_name = new_name,
2626                 .bitmask = server->attr_bitmask,
2627         };
2628         struct nfs_renameres res = {
2629                 .server = server,
2630         };
2631         struct rpc_message msg = {
2632                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2633                 .rpc_argp = &arg,
2634                 .rpc_resp = &res,
2635         };
2636         int status = -ENOMEM;
2637
2638         res.old_fattr = nfs_alloc_fattr();
2639         res.new_fattr = nfs_alloc_fattr();
2640         if (res.old_fattr == NULL || res.new_fattr == NULL)
2641                 goto out;
2642
2643         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2644         if (!status) {
2645                 update_changeattr(old_dir, &res.old_cinfo);
2646                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2647                 update_changeattr(new_dir, &res.new_cinfo);
2648                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2649         }
2650 out:
2651         nfs_free_fattr(res.new_fattr);
2652         nfs_free_fattr(res.old_fattr);
2653         return status;
2654 }
2655
2656 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2657                 struct inode *new_dir, struct qstr *new_name)
2658 {
2659         struct nfs4_exception exception = { };
2660         int err;
2661         do {
2662                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2663                                 _nfs4_proc_rename(old_dir, old_name,
2664                                         new_dir, new_name),
2665                                 &exception);
2666         } while (exception.retry);
2667         return err;
2668 }
2669
2670 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2671 {
2672         struct nfs_server *server = NFS_SERVER(inode);
2673         struct nfs4_link_arg arg = {
2674                 .fh     = NFS_FH(inode),
2675                 .dir_fh = NFS_FH(dir),
2676                 .name   = name,
2677                 .bitmask = server->attr_bitmask,
2678         };
2679         struct nfs4_link_res res = {
2680                 .server = server,
2681         };
2682         struct rpc_message msg = {
2683                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2684                 .rpc_argp = &arg,
2685                 .rpc_resp = &res,
2686         };
2687         int status = -ENOMEM;
2688
2689         res.fattr = nfs_alloc_fattr();
2690         res.dir_attr = nfs_alloc_fattr();
2691         if (res.fattr == NULL || res.dir_attr == NULL)
2692                 goto out;
2693
2694         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2695         if (!status) {
2696                 update_changeattr(dir, &res.cinfo);
2697                 nfs_post_op_update_inode(dir, res.dir_attr);
2698                 nfs_post_op_update_inode(inode, res.fattr);
2699         }
2700 out:
2701         nfs_free_fattr(res.dir_attr);
2702         nfs_free_fattr(res.fattr);
2703         return status;
2704 }
2705
2706 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2707 {
2708         struct nfs4_exception exception = { };
2709         int err;
2710         do {
2711                 err = nfs4_handle_exception(NFS_SERVER(inode),
2712                                 _nfs4_proc_link(inode, dir, name),
2713                                 &exception);
2714         } while (exception.retry);
2715         return err;
2716 }
2717
2718 struct nfs4_createdata {
2719         struct rpc_message msg;
2720         struct nfs4_create_arg arg;
2721         struct nfs4_create_res res;
2722         struct nfs_fh fh;
2723         struct nfs_fattr fattr;
2724         struct nfs_fattr dir_fattr;
2725 };
2726
2727 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2728                 struct qstr *name, struct iattr *sattr, u32 ftype)
2729 {
2730         struct nfs4_createdata *data;
2731
2732         data = kzalloc(sizeof(*data), GFP_KERNEL);
2733         if (data != NULL) {
2734                 struct nfs_server *server = NFS_SERVER(dir);
2735
2736                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2737                 data->msg.rpc_argp = &data->arg;
2738                 data->msg.rpc_resp = &data->res;
2739                 data->arg.dir_fh = NFS_FH(dir);
2740                 data->arg.server = server;
2741                 data->arg.name = name;
2742                 data->arg.attrs = sattr;
2743                 data->arg.ftype = ftype;
2744                 data->arg.bitmask = server->attr_bitmask;
2745                 data->res.server = server;
2746                 data->res.fh = &data->fh;
2747                 data->res.fattr = &data->fattr;
2748                 data->res.dir_fattr = &data->dir_fattr;
2749                 nfs_fattr_init(data->res.fattr);
2750                 nfs_fattr_init(data->res.dir_fattr);
2751         }
2752         return data;
2753 }
2754
2755 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2756 {
2757         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2758                                     &data->arg, &data->res, 1);
2759         if (status == 0) {
2760                 update_changeattr(dir, &data->res.dir_cinfo);
2761                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2762                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2763         }
2764         return status;
2765 }
2766
2767 static void nfs4_free_createdata(struct nfs4_createdata *data)
2768 {
2769         kfree(data);
2770 }
2771
2772 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2773                 struct page *page, unsigned int len, struct iattr *sattr)
2774 {
2775         struct nfs4_createdata *data;
2776         int status = -ENAMETOOLONG;
2777
2778         if (len > NFS4_MAXPATHLEN)
2779                 goto out;
2780
2781         status = -ENOMEM;
2782         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2783         if (data == NULL)
2784                 goto out;
2785
2786         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2787         data->arg.u.symlink.pages = &page;
2788         data->arg.u.symlink.len = len;
2789
2790         status = nfs4_do_create(dir, dentry, data);
2791
2792         nfs4_free_createdata(data);
2793 out:
2794         return status;
2795 }
2796
2797 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2798                 struct page *page, unsigned int len, struct iattr *sattr)
2799 {
2800         struct nfs4_exception exception = { };
2801         int err;
2802         do {
2803                 err = nfs4_handle_exception(NFS_SERVER(dir),
2804                                 _nfs4_proc_symlink(dir, dentry, page,
2805                                                         len, sattr),
2806                                 &exception);
2807         } while (exception.retry);
2808         return err;
2809 }
2810
2811 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2812                 struct iattr *sattr)
2813 {
2814         struct nfs4_createdata *data;
2815         int status = -ENOMEM;
2816
2817         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2818         if (data == NULL)
2819                 goto out;
2820
2821         status = nfs4_do_create(dir, dentry, data);
2822
2823         nfs4_free_createdata(data);
2824 out:
2825         return status;
2826 }
2827
2828 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2829                 struct iattr *sattr)
2830 {
2831         struct nfs4_exception exception = { };
2832         int err;
2833
2834         sattr->ia_mode &= ~current_umask();
2835         do {
2836                 err = nfs4_handle_exception(NFS_SERVER(dir),
2837                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2838                                 &exception);
2839         } while (exception.retry);
2840         return err;
2841 }
2842
2843 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2844                 u64 cookie, struct page **pages, unsigned int count, int plus)
2845 {
2846         struct inode            *dir = dentry->d_inode;
2847         struct nfs4_readdir_arg args = {
2848                 .fh = NFS_FH(dir),
2849                 .pages = pages,
2850                 .pgbase = 0,
2851                 .count = count,
2852                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2853                 .plus = plus,
2854         };
2855         struct nfs4_readdir_res res;
2856         struct rpc_message msg = {
2857                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2858                 .rpc_argp = &args,
2859                 .rpc_resp = &res,
2860                 .rpc_cred = cred,
2861         };
2862         int                     status;
2863
2864         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2865                         dentry->d_parent->d_name.name,
2866                         dentry->d_name.name,
2867                         (unsigned long long)cookie);
2868         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2869         res.pgbase = args.pgbase;
2870         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2871         if (status >= 0) {
2872                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2873                 status += args.pgbase;
2874         }
2875
2876         nfs_invalidate_atime(dir);
2877
2878         dprintk("%s: returns %d\n", __func__, status);
2879         return status;
2880 }
2881
2882 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2883                 u64 cookie, struct page **pages, unsigned int count, int plus)
2884 {
2885         struct nfs4_exception exception = { };
2886         int err;
2887         do {
2888                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2889                                 _nfs4_proc_readdir(dentry, cred, cookie,
2890                                         pages, count, plus),
2891                                 &exception);
2892         } while (exception.retry);
2893         return err;
2894 }
2895
2896 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2897                 struct iattr *sattr, dev_t rdev)
2898 {
2899         struct nfs4_createdata *data;
2900         int mode = sattr->ia_mode;
2901         int status = -ENOMEM;
2902
2903         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2904         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2905
2906         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2907         if (data == NULL)
2908                 goto out;
2909
2910         if (S_ISFIFO(mode))
2911                 data->arg.ftype = NF4FIFO;
2912         else if (S_ISBLK(mode)) {
2913                 data->arg.ftype = NF4BLK;
2914                 data->arg.u.device.specdata1 = MAJOR(rdev);
2915                 data->arg.u.device.specdata2 = MINOR(rdev);
2916         }
2917         else if (S_ISCHR(mode)) {
2918                 data->arg.ftype = NF4CHR;
2919                 data->arg.u.device.specdata1 = MAJOR(rdev);
2920                 data->arg.u.device.specdata2 = MINOR(rdev);
2921         }
2922
2923         status = nfs4_do_create(dir, dentry, data);
2924
2925         nfs4_free_createdata(data);
2926 out:
2927         return status;
2928 }
2929
2930 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2931                 struct iattr *sattr, dev_t rdev)
2932 {
2933         struct nfs4_exception exception = { };
2934         int err;
2935
2936         sattr->ia_mode &= ~current_umask();
2937         do {
2938                 err = nfs4_handle_exception(NFS_SERVER(dir),
2939                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2940                                 &exception);
2941         } while (exception.retry);
2942         return err;
2943 }
2944
2945 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2946                  struct nfs_fsstat *fsstat)
2947 {
2948         struct nfs4_statfs_arg args = {
2949                 .fh = fhandle,
2950                 .bitmask = server->attr_bitmask,
2951         };
2952         struct nfs4_statfs_res res = {
2953                 .fsstat = fsstat,
2954         };
2955         struct rpc_message msg = {
2956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2957                 .rpc_argp = &args,
2958                 .rpc_resp = &res,
2959         };
2960
2961         nfs_fattr_init(fsstat->fattr);
2962         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2963 }
2964
2965 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2966 {
2967         struct nfs4_exception exception = { };
2968         int err;
2969         do {
2970                 err = nfs4_handle_exception(server,
2971                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2972                                 &exception);
2973         } while (exception.retry);
2974         return err;
2975 }
2976
2977 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2978                 struct nfs_fsinfo *fsinfo)
2979 {
2980         struct nfs4_fsinfo_arg args = {
2981                 .fh = fhandle,
2982                 .bitmask = server->attr_bitmask,
2983         };
2984         struct nfs4_fsinfo_res res = {
2985                 .fsinfo = fsinfo,
2986         };
2987         struct rpc_message msg = {
2988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2989                 .rpc_argp = &args,
2990                 .rpc_resp = &res,
2991         };
2992
2993         return nfs4_call_sync(server, &msg, &args, &res, 0);
2994 }
2995
2996 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2997 {
2998         struct nfs4_exception exception = { };
2999         int err;
3000
3001         do {
3002                 err = nfs4_handle_exception(server,
3003                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3004                                 &exception);
3005         } while (exception.retry);
3006         return err;
3007 }
3008
3009 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3010 {
3011         nfs_fattr_init(fsinfo->fattr);
3012         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3013 }
3014
3015 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3016                 struct nfs_pathconf *pathconf)
3017 {
3018         struct nfs4_pathconf_arg args = {
3019                 .fh = fhandle,
3020                 .bitmask = server->attr_bitmask,
3021         };
3022         struct nfs4_pathconf_res res = {
3023                 .pathconf = pathconf,
3024         };
3025         struct rpc_message msg = {
3026                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3027                 .rpc_argp = &args,
3028                 .rpc_resp = &res,
3029         };
3030
3031         /* None of the pathconf attributes are mandatory to implement */
3032         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3033                 memset(pathconf, 0, sizeof(*pathconf));
3034                 return 0;
3035         }
3036
3037         nfs_fattr_init(pathconf->fattr);
3038         return nfs4_call_sync(server, &msg, &args, &res, 0);
3039 }
3040
3041 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3042                 struct nfs_pathconf *pathconf)
3043 {
3044         struct nfs4_exception exception = { };
3045         int err;
3046
3047         do {
3048                 err = nfs4_handle_exception(server,
3049                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3050                                 &exception);
3051         } while (exception.retry);
3052         return err;
3053 }
3054
3055 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3056 {
3057         struct nfs_server *server = NFS_SERVER(data->inode);
3058
3059         dprintk("--> %s\n", __func__);
3060
3061         if (!nfs4_sequence_done(task, &data->res.seq_res))
3062                 return -EAGAIN;
3063
3064         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3065                 nfs_restart_rpc(task, server->nfs_client);
3066                 return -EAGAIN;
3067         }
3068
3069         nfs_invalidate_atime(data->inode);
3070         if (task->tk_status > 0)
3071                 renew_lease(server, data->timestamp);
3072         return 0;
3073 }
3074
3075 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3076 {
3077         data->timestamp   = jiffies;
3078         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3079 }
3080
3081 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3082 {
3083         struct inode *inode = data->inode;
3084
3085         if (!nfs4_sequence_done(task, &data->res.seq_res))
3086                 return -EAGAIN;
3087
3088         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3089                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3090                 return -EAGAIN;
3091         }
3092         if (task->tk_status >= 0) {
3093                 renew_lease(NFS_SERVER(inode), data->timestamp);
3094                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3095         }
3096         return 0;
3097 }
3098
3099 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3100 {
3101         struct nfs_server *server = NFS_SERVER(data->inode);
3102
3103         data->args.bitmask = server->cache_consistency_bitmask;
3104         data->res.server = server;
3105         data->timestamp   = jiffies;
3106
3107         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3108 }
3109
3110 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3111 {
3112         struct inode *inode = data->inode;
3113
3114         if (!nfs4_sequence_done(task, &data->res.seq_res))
3115                 return -EAGAIN;
3116
3117         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3118                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3119                 return -EAGAIN;
3120         }
3121         nfs_refresh_inode(inode, data->res.fattr);
3122         return 0;
3123 }
3124
3125 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3126 {
3127         struct nfs_server *server = NFS_SERVER(data->inode);
3128
3129         data->args.bitmask = server->cache_consistency_bitmask;
3130         data->res.server = server;
3131         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3132 }
3133
3134 struct nfs4_renewdata {
3135         struct nfs_client       *client;
3136         unsigned long           timestamp;
3137 };
3138
3139 /*
3140  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3141  * standalone procedure for queueing an asynchronous RENEW.
3142  */
3143 static void nfs4_renew_release(void *calldata)
3144 {
3145         struct nfs4_renewdata *data = calldata;
3146         struct nfs_client *clp = data->client;
3147
3148         if (atomic_read(&clp->cl_count) > 1)
3149                 nfs4_schedule_state_renewal(clp);
3150         nfs_put_client(clp);
3151         kfree(data);
3152 }
3153
3154 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3155 {
3156         struct nfs4_renewdata *data = calldata;
3157         struct nfs_client *clp = data->client;
3158         unsigned long timestamp = data->timestamp;
3159
3160         if (task->tk_status < 0) {
3161                 /* Unless we're shutting down, schedule state recovery! */
3162                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3163                         nfs4_schedule_state_recovery(clp);
3164                 return;
3165         }
3166         do_renew_lease(clp, timestamp);
3167 }
3168
3169 static const struct rpc_call_ops nfs4_renew_ops = {
3170         .rpc_call_done = nfs4_renew_done,
3171         .rpc_release = nfs4_renew_release,
3172 };
3173
3174 int nfs4_proc_async_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         struct nfs4_renewdata *data;
3182
3183         if (!atomic_inc_not_zero(&clp->cl_count))
3184                 return -EIO;
3185         data = kmalloc(sizeof(*data), GFP_KERNEL);
3186         if (data == NULL)
3187                 return -ENOMEM;
3188         data->client = clp;
3189         data->timestamp = jiffies;
3190         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3191                         &nfs4_renew_ops, data);
3192 }
3193
3194 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3195 {
3196         struct rpc_message msg = {
3197                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3198                 .rpc_argp       = clp,
3199                 .rpc_cred       = cred,
3200         };
3201         unsigned long now = jiffies;
3202         int status;
3203
3204         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3205         if (status < 0)
3206                 return status;
3207         do_renew_lease(clp, now);
3208         return 0;
3209 }
3210
3211 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3212 {
3213         return (server->caps & NFS_CAP_ACLS)
3214                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3215                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3216 }
3217
3218 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3219  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3220  * the stack.
3221  */
3222 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3223
3224 static void buf_to_pages(const void *buf, size_t buflen,
3225                 struct page **pages, unsigned int *pgbase)
3226 {
3227         const void *p = buf;
3228
3229         *pgbase = offset_in_page(buf);
3230         p -= *pgbase;
3231         while (p < buf + buflen) {
3232                 *(pages++) = virt_to_page(p);
3233                 p += PAGE_CACHE_SIZE;
3234         }
3235 }
3236
3237 struct nfs4_cached_acl {
3238         int cached;
3239         size_t len;
3240         char data[0];
3241 };
3242
3243 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3244 {
3245         struct nfs_inode *nfsi = NFS_I(inode);
3246
3247         spin_lock(&inode->i_lock);
3248         kfree(nfsi->nfs4_acl);
3249         nfsi->nfs4_acl = acl;
3250         spin_unlock(&inode->i_lock);
3251 }
3252
3253 static void nfs4_zap_acl_attr(struct inode *inode)
3254 {
3255         nfs4_set_cached_acl(inode, NULL);
3256 }
3257
3258 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3259 {
3260         struct nfs_inode *nfsi = NFS_I(inode);
3261         struct nfs4_cached_acl *acl;
3262         int ret = -ENOENT;
3263
3264         spin_lock(&inode->i_lock);
3265         acl = nfsi->nfs4_acl;
3266         if (acl == NULL)
3267                 goto out;
3268         if (buf == NULL) /* user is just asking for length */
3269                 goto out_len;
3270         if (acl->cached == 0)
3271                 goto out;
3272         ret = -ERANGE; /* see getxattr(2) man page */
3273         if (acl->len > buflen)
3274                 goto out;
3275         memcpy(buf, acl->data, acl->len);
3276 out_len:
3277         ret = acl->len;
3278 out:
3279         spin_unlock(&inode->i_lock);
3280         return ret;
3281 }
3282
3283 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3284 {
3285         struct nfs4_cached_acl *acl;
3286
3287         if (buf && acl_len <= PAGE_SIZE) {
3288                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3289                 if (acl == NULL)
3290                         goto out;
3291                 acl->cached = 1;
3292                 memcpy(acl->data, buf, acl_len);
3293         } else {
3294                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3295                 if (acl == NULL)
3296                         goto out;
3297                 acl->cached = 0;
3298         }
3299         acl->len = acl_len;
3300 out:
3301         nfs4_set_cached_acl(inode, acl);
3302 }
3303
3304 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3305 {
3306         struct page *pages[NFS4ACL_MAXPAGES];
3307         struct nfs_getaclargs args = {
3308                 .fh = NFS_FH(inode),
3309                 .acl_pages = pages,
3310                 .acl_len = buflen,
3311         };
3312         struct nfs_getaclres res = {
3313                 .acl_len = buflen,
3314         };
3315         void *resp_buf;
3316         struct rpc_message msg = {
3317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3318                 .rpc_argp = &args,
3319                 .rpc_resp = &res,
3320         };
3321         struct page *localpage = NULL;
3322         int ret;
3323
3324         if (buflen < PAGE_SIZE) {
3325                 /* As long as we're doing a round trip to the server anyway,
3326                  * let's be prepared for a page of acl data. */
3327                 localpage = alloc_page(GFP_KERNEL);
3328                 resp_buf = page_address(localpage);
3329                 if (localpage == NULL)
3330                         return -ENOMEM;
3331                 args.acl_pages[0] = localpage;
3332                 args.acl_pgbase = 0;
3333                 args.acl_len = PAGE_SIZE;
3334         } else {
3335                 resp_buf = buf;
3336                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3337         }
3338         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3339         if (ret)
3340                 goto out_free;
3341         if (res.acl_len > args.acl_len)
3342                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3343         else
3344                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3345         if (buf) {
3346                 ret = -ERANGE;
3347                 if (res.acl_len > buflen)
3348                         goto out_free;
3349                 if (localpage)
3350                         memcpy(buf, resp_buf, res.acl_len);
3351         }
3352         ret = res.acl_len;
3353 out_free:
3354         if (localpage)
3355                 __free_page(localpage);
3356         return ret;
3357 }
3358
3359 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3360 {
3361         struct nfs4_exception exception = { };
3362         ssize_t ret;
3363         do {
3364                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3365                 if (ret >= 0)
3366                         break;
3367                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3368         } while (exception.retry);
3369         return ret;
3370 }
3371
3372 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3373 {
3374         struct nfs_server *server = NFS_SERVER(inode);
3375         int ret;
3376
3377         if (!nfs4_server_supports_acls(server))
3378                 return -EOPNOTSUPP;
3379         ret = nfs_revalidate_inode(server, inode);
3380         if (ret < 0)
3381                 return ret;
3382         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3383                 nfs_zap_acl_cache(inode);
3384         ret = nfs4_read_cached_acl(inode, buf, buflen);
3385         if (ret != -ENOENT)
3386                 return ret;
3387         return nfs4_get_acl_uncached(inode, buf, buflen);
3388 }
3389
3390 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3391 {
3392         struct nfs_server *server = NFS_SERVER(inode);
3393         struct page *pages[NFS4ACL_MAXPAGES];
3394         struct nfs_setaclargs arg = {
3395                 .fh             = NFS_FH(inode),
3396                 .acl_pages      = pages,
3397                 .acl_len        = buflen,
3398         };
3399         struct nfs_setaclres res;
3400         struct rpc_message msg = {
3401                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3402                 .rpc_argp       = &arg,
3403                 .rpc_resp       = &res,
3404         };
3405         int ret;
3406
3407         if (!nfs4_server_supports_acls(server))
3408                 return -EOPNOTSUPP;
3409         nfs_inode_return_delegation(inode);
3410         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3411         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3412         /*
3413          * Acl update can result in inode attribute update.
3414          * so mark the attribute cache invalid.
3415          */
3416         spin_lock(&inode->i_lock);
3417         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3418         spin_unlock(&inode->i_lock);
3419         nfs_access_zap_cache(inode);
3420         nfs_zap_acl_cache(inode);
3421         return ret;
3422 }
3423
3424 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3425 {
3426         struct nfs4_exception exception = { };
3427         int err;
3428         do {
3429                 err = nfs4_handle_exception(NFS_SERVER(inode),
3430                                 __nfs4_proc_set_acl(inode, buf, buflen),
3431                                 &exception);
3432         } while (exception.retry);
3433         return err;
3434 }
3435
3436 static int
3437 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3438 {
3439         struct nfs_client *clp = server->nfs_client;
3440
3441         if (task->tk_status >= 0)
3442                 return 0;
3443         switch(task->tk_status) {
3444                 case -NFS4ERR_ADMIN_REVOKED:
3445                 case -NFS4ERR_BAD_STATEID:
3446                 case -NFS4ERR_OPENMODE:
3447                         if (state == NULL)
3448                                 break;
3449                         nfs4_state_mark_reclaim_nograce(clp, state);
3450                         goto do_state_recovery;
3451                 case -NFS4ERR_STALE_STATEID:
3452                 case -NFS4ERR_STALE_CLIENTID:
3453                 case -NFS4ERR_EXPIRED:
3454                         goto do_state_recovery;
3455 #if defined(CONFIG_NFS_V4_1)
3456                 case -NFS4ERR_BADSESSION:
3457                 case -NFS4ERR_BADSLOT:
3458                 case -NFS4ERR_BAD_HIGH_SLOT:
3459                 case -NFS4ERR_DEADSESSION:
3460                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3461                 case -NFS4ERR_SEQ_FALSE_RETRY:
3462                 case -NFS4ERR_SEQ_MISORDERED:
3463                         dprintk("%s ERROR %d, Reset session\n", __func__,
3464                                 task->tk_status);
3465                         nfs4_schedule_state_recovery(clp);
3466                         task->tk_status = 0;
3467                         return -EAGAIN;
3468 #endif /* CONFIG_NFS_V4_1 */
3469                 case -NFS4ERR_DELAY:
3470                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3471                 case -NFS4ERR_GRACE:
3472                 case -EKEYEXPIRED:
3473                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3474                         task->tk_status = 0;
3475                         return -EAGAIN;
3476                 case -NFS4ERR_OLD_STATEID:
3477                         task->tk_status = 0;
3478                         return -EAGAIN;
3479         }
3480         task->tk_status = nfs4_map_errors(task->tk_status);
3481         return 0;
3482 do_state_recovery:
3483         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3484         nfs4_schedule_state_recovery(clp);
3485         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3486                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3487         task->tk_status = 0;
3488         return -EAGAIN;
3489 }
3490
3491 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3492                 unsigned short port, struct rpc_cred *cred,
3493                 struct nfs4_setclientid_res *res)
3494 {
3495         nfs4_verifier sc_verifier;
3496         struct nfs4_setclientid setclientid = {
3497                 .sc_verifier = &sc_verifier,
3498                 .sc_prog = program,
3499                 .sc_cb_ident = clp->cl_cb_ident,
3500         };
3501         struct rpc_message msg = {
3502                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3503                 .rpc_argp = &setclientid,
3504                 .rpc_resp = res,
3505                 .rpc_cred = cred,
3506         };
3507         __be32 *p;
3508         int loop = 0;
3509         int status;
3510
3511         p = (__be32*)sc_verifier.data;
3512         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3513         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3514
3515         for(;;) {
3516                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3517                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3518                                 clp->cl_ipaddr,
3519                                 rpc_peeraddr2str(clp->cl_rpcclient,
3520                                                         RPC_DISPLAY_ADDR),
3521                                 rpc_peeraddr2str(clp->cl_rpcclient,
3522                                                         RPC_DISPLAY_PROTO),
3523                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3524                                 clp->cl_id_uniquifier);
3525                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3526                                 sizeof(setclientid.sc_netid),
3527                                 rpc_peeraddr2str(clp->cl_rpcclient,
3528                                                         RPC_DISPLAY_NETID));
3529                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3530                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3531                                 clp->cl_ipaddr, port >> 8, port & 255);
3532
3533                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3534                 if (status != -NFS4ERR_CLID_INUSE)
3535                         break;
3536                 if (signalled())
3537                         break;
3538                 if (loop++ & 1)
3539                         ssleep(clp->cl_lease_time / HZ + 1);
3540                 else
3541                         if (++clp->cl_id_uniquifier == 0)
3542                                 break;
3543         }
3544         return status;
3545 }
3546
3547 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3548                 struct nfs4_setclientid_res *arg,
3549                 struct rpc_cred *cred)
3550 {
3551         struct nfs_fsinfo fsinfo;
3552         struct rpc_message msg = {
3553                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3554                 .rpc_argp = arg,
3555                 .rpc_resp = &fsinfo,
3556                 .rpc_cred = cred,
3557         };
3558         unsigned long now;
3559         int status;
3560
3561         now = jiffies;
3562         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3563         if (status == 0) {
3564                 spin_lock(&clp->cl_lock);
3565                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3566                 clp->cl_last_renewal = now;
3567                 spin_unlock(&clp->cl_lock);
3568         }
3569         return status;
3570 }
3571
3572 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3573                 struct nfs4_setclientid_res *arg,
3574                 struct rpc_cred *cred)
3575 {
3576         long timeout = 0;
3577         int err;
3578         do {
3579                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3580                 switch (err) {
3581                         case 0:
3582                                 return err;
3583                         case -NFS4ERR_RESOURCE:
3584                                 /* The IBM lawyers misread another document! */
3585                         case -NFS4ERR_DELAY:
3586                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3587                 }
3588         } while (err == 0);
3589         return err;
3590 }
3591
3592 struct nfs4_delegreturndata {
3593         struct nfs4_delegreturnargs args;
3594         struct nfs4_delegreturnres res;
3595         struct nfs_fh fh;
3596         nfs4_stateid stateid;
3597         unsigned long timestamp;
3598         struct nfs_fattr fattr;
3599         int rpc_status;
3600 };
3601
3602 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3603 {
3604         struct nfs4_delegreturndata *data = calldata;
3605
3606         if (!nfs4_sequence_done(task, &data->res.seq_res))
3607                 return;
3608
3609         switch (task->tk_status) {
3610         case -NFS4ERR_STALE_STATEID:
3611         case -NFS4ERR_EXPIRED:
3612         case 0:
3613                 renew_lease(data->res.server, data->timestamp);
3614                 break;
3615         default:
3616                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3617                                 -EAGAIN) {
3618                         nfs_restart_rpc(task, data->res.server->nfs_client);
3619                         return;
3620                 }
3621         }
3622         data->rpc_status = task->tk_status;
3623 }
3624
3625 static void nfs4_delegreturn_release(void *calldata)
3626 {
3627         kfree(calldata);
3628 }
3629
3630 #if defined(CONFIG_NFS_V4_1)
3631 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3632 {
3633         struct nfs4_delegreturndata *d_data;
3634
3635         d_data = (struct nfs4_delegreturndata *)data;
3636
3637         if (nfs4_setup_sequence(d_data->res.server,
3638                                 &d_data->args.seq_args,
3639                                 &d_data->res.seq_res, 1, task))
3640                 return;
3641         rpc_call_start(task);
3642 }
3643 #endif /* CONFIG_NFS_V4_1 */
3644
3645 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3646 #if defined(CONFIG_NFS_V4_1)
3647         .rpc_call_prepare = nfs4_delegreturn_prepare,
3648 #endif /* CONFIG_NFS_V4_1 */
3649         .rpc_call_done = nfs4_delegreturn_done,
3650         .rpc_release = nfs4_delegreturn_release,
3651 };
3652
3653 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3654 {
3655         struct nfs4_delegreturndata *data;
3656         struct nfs_server *server = NFS_SERVER(inode);
3657         struct rpc_task *task;
3658         struct rpc_message msg = {
3659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3660                 .rpc_cred = cred,
3661         };
3662         struct rpc_task_setup task_setup_data = {
3663                 .rpc_client = server->client,
3664                 .rpc_message = &msg,
3665                 .callback_ops = &nfs4_delegreturn_ops,
3666                 .flags = RPC_TASK_ASYNC,
3667         };
3668         int status = 0;
3669
3670         data = kzalloc(sizeof(*data), GFP_NOFS);
3671         if (data == NULL)
3672                 return -ENOMEM;
3673         data->args.fhandle = &data->fh;
3674         data->args.stateid = &data->stateid;
3675         data->args.bitmask = server->attr_bitmask;
3676         nfs_copy_fh(&data->fh, NFS_FH(inode));
3677         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3678         data->res.fattr = &data->fattr;
3679         data->res.server = server;
3680         nfs_fattr_init(data->res.fattr);
3681         data->timestamp = jiffies;
3682         data->rpc_status = 0;
3683
3684         task_setup_data.callback_data = data;
3685         msg.rpc_argp = &data->args;
3686         msg.rpc_resp = &data->res;
3687         task = rpc_run_task(&task_setup_data);
3688         if (IS_ERR(task))
3689                 return PTR_ERR(task);
3690         if (!issync)
3691                 goto out;
3692         status = nfs4_wait_for_completion_rpc_task(task);
3693         if (status != 0)
3694                 goto out;
3695         status = data->rpc_status;
3696         if (status != 0)
3697                 goto out;
3698         nfs_refresh_inode(inode, &data->fattr);
3699 out:
3700         rpc_put_task(task);
3701         return status;
3702 }
3703
3704 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3705 {
3706         struct nfs_server *server = NFS_SERVER(inode);
3707         struct nfs4_exception exception = { };
3708         int err;
3709         do {
3710                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3711                 switch (err) {
3712                         case -NFS4ERR_STALE_STATEID:
3713                         case -NFS4ERR_EXPIRED:
3714                         case 0:
3715                                 return 0;
3716                 }
3717                 err = nfs4_handle_exception(server, err, &exception);
3718         } while (exception.retry);
3719         return err;
3720 }
3721
3722 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3723 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3724
3725 /*
3726  * sleep, with exponential backoff, and retry the LOCK operation.
3727  */
3728 static unsigned long
3729 nfs4_set_lock_task_retry(unsigned long timeout)
3730 {
3731         schedule_timeout_killable(timeout);
3732         timeout <<= 1;
3733         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3734                 return NFS4_LOCK_MAXTIMEOUT;
3735         return timeout;
3736 }
3737
3738 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3739 {
3740         struct inode *inode = state->inode;
3741         struct nfs_server *server = NFS_SERVER(inode);
3742         struct nfs_client *clp = server->nfs_client;
3743         struct nfs_lockt_args arg = {
3744                 .fh = NFS_FH(inode),
3745                 .fl = request,
3746         };
3747         struct nfs_lockt_res res = {
3748                 .denied = request,
3749         };
3750         struct rpc_message msg = {
3751                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3752                 .rpc_argp       = &arg,
3753                 .rpc_resp       = &res,
3754                 .rpc_cred       = state->owner->so_cred,
3755         };
3756         struct nfs4_lock_state *lsp;
3757         int status;
3758
3759         arg.lock_owner.clientid = clp->cl_clientid;
3760         status = nfs4_set_lock_state(state, request);
3761         if (status != 0)
3762                 goto out;
3763         lsp = request->fl_u.nfs4_fl.owner;
3764         arg.lock_owner.id = lsp->ls_id.id;
3765         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3766         switch (status) {
3767                 case 0:
3768                         request->fl_type = F_UNLCK;
3769                         break;
3770                 case -NFS4ERR_DENIED:
3771                         status = 0;
3772         }
3773         request->fl_ops->fl_release_private(request);
3774 out:
3775         return status;
3776 }
3777
3778 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3779 {
3780         struct nfs4_exception exception = { };
3781         int err;
3782
3783         do {
3784                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3785                                 _nfs4_proc_getlk(state, cmd, request),
3786                                 &exception);
3787         } while (exception.retry);
3788         return err;
3789 }
3790
3791 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3792 {
3793         int res = 0;
3794         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3795                 case FL_POSIX:
3796                         res = posix_lock_file_wait(file, fl);
3797                         break;
3798                 case FL_FLOCK:
3799                         res = flock_lock_file_wait(file, fl);
3800                         break;
3801                 default:
3802                         BUG();
3803         }
3804         return res;
3805 }
3806
3807 struct nfs4_unlockdata {
3808         struct nfs_locku_args arg;
3809         struct nfs_locku_res res;
3810         struct nfs4_lock_state *lsp;
3811         struct nfs_open_context *ctx;
3812         struct file_lock fl;
3813         const struct nfs_server *server;
3814         unsigned long timestamp;
3815 };
3816
3817 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3818                 struct nfs_open_context *ctx,
3819                 struct nfs4_lock_state *lsp,
3820                 struct nfs_seqid *seqid)
3821 {
3822         struct nfs4_unlockdata *p;
3823         struct inode *inode = lsp->ls_state->inode;
3824
3825         p = kzalloc(sizeof(*p), GFP_NOFS);
3826         if (p == NULL)
3827                 return NULL;
3828         p->arg.fh = NFS_FH(inode);
3829         p->arg.fl = &p->fl;
3830         p->arg.seqid = seqid;
3831         p->res.seqid = seqid;
3832         p->arg.stateid = &lsp->ls_stateid;
3833         p->lsp = lsp;
3834         atomic_inc(&lsp->ls_count);
3835         /* Ensure we don't close file until we're done freeing locks! */
3836         p->ctx = get_nfs_open_context(ctx);
3837         memcpy(&p->fl, fl, sizeof(p->fl));
3838         p->server = NFS_SERVER(inode);
3839         return p;
3840 }
3841
3842 static void nfs4_locku_release_calldata(void *data)
3843 {
3844         struct nfs4_unlockdata *calldata = data;
3845         nfs_free_seqid(calldata->arg.seqid);
3846         nfs4_put_lock_state(calldata->lsp);
3847         put_nfs_open_context(calldata->ctx);
3848         kfree(calldata);
3849 }
3850
3851 static void nfs4_locku_done(struct rpc_task *task, void *data)
3852 {
3853         struct nfs4_unlockdata *calldata = data;
3854
3855         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3856                 return;
3857         switch (task->tk_status) {
3858                 case 0:
3859                         memcpy(calldata->lsp->ls_stateid.data,
3860                                         calldata->res.stateid.data,
3861                                         sizeof(calldata->lsp->ls_stateid.data));
3862                         renew_lease(calldata->server, calldata->timestamp);
3863                         break;
3864                 case -NFS4ERR_BAD_STATEID:
3865                 case -NFS4ERR_OLD_STATEID:
3866                 case -NFS4ERR_STALE_STATEID:
3867                 case -NFS4ERR_EXPIRED:
3868                         break;
3869                 default:
3870                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3871                                 nfs_restart_rpc(task,
3872                                                  calldata->server->nfs_client);
3873         }
3874 }
3875
3876 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3877 {
3878         struct nfs4_unlockdata *calldata = data;
3879
3880         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3881                 return;
3882         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3883                 /* Note: exit _without_ running nfs4_locku_done */
3884                 task->tk_action = NULL;
3885                 return;
3886         }
3887         calldata->timestamp = jiffies;
3888         if (nfs4_setup_sequence(calldata->server,
3889                                 &calldata->arg.seq_args,
3890                                 &calldata->res.seq_res, 1, task))
3891                 return;
3892         rpc_call_start(task);
3893 }
3894
3895 static const struct rpc_call_ops nfs4_locku_ops = {
3896         .rpc_call_prepare = nfs4_locku_prepare,
3897         .rpc_call_done = nfs4_locku_done,
3898         .rpc_release = nfs4_locku_release_calldata,
3899 };
3900
3901 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3902                 struct nfs_open_context *ctx,
3903                 struct nfs4_lock_state *lsp,
3904                 struct nfs_seqid *seqid)
3905 {
3906         struct nfs4_unlockdata *data;
3907         struct rpc_message msg = {
3908                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3909                 .rpc_cred = ctx->cred,
3910         };
3911         struct rpc_task_setup task_setup_data = {
3912                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3913                 .rpc_message = &msg,
3914                 .callback_ops = &nfs4_locku_ops,
3915                 .workqueue = nfsiod_workqueue,
3916                 .flags = RPC_TASK_ASYNC,
3917         };
3918
3919         /* Ensure this is an unlock - when canceling a lock, the
3920          * canceled lock is passed in, and it won't be an unlock.
3921          */
3922         fl->fl_type = F_UNLCK;
3923
3924         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3925         if (data == NULL) {
3926                 nfs_free_seqid(seqid);
3927                 return ERR_PTR(-ENOMEM);
3928         }
3929
3930         msg.rpc_argp = &data->arg;
3931         msg.rpc_resp = &data->res;
3932         task_setup_data.callback_data = data;
3933         return rpc_run_task(&task_setup_data);
3934 }
3935
3936 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3937 {
3938         struct nfs_inode *nfsi = NFS_I(state->inode);
3939         struct nfs_seqid *seqid;
3940         struct nfs4_lock_state *lsp;
3941         struct rpc_task *task;
3942         int status = 0;
3943         unsigned char fl_flags = request->fl_flags;
3944
3945         status = nfs4_set_lock_state(state, request);
3946         /* Unlock _before_ we do the RPC call */
3947         request->fl_flags |= FL_EXISTS;
3948         down_read(&nfsi->rwsem);
3949         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3950                 up_read(&nfsi->rwsem);
3951                 goto out;
3952         }
3953         up_read(&nfsi->rwsem);
3954         if (status != 0)
3955                 goto out;
3956         /* Is this a delegated lock? */
3957         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3958                 goto out;
3959         lsp = request->fl_u.nfs4_fl.owner;
3960         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3961         status = -ENOMEM;
3962         if (seqid == NULL)
3963                 goto out;
3964         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3965         status = PTR_ERR(task);
3966         if (IS_ERR(task))
3967                 goto out;
3968         status = nfs4_wait_for_completion_rpc_task(task);
3969         rpc_put_task(task);
3970 out:
3971         request->fl_flags = fl_flags;
3972         return status;
3973 }
3974
3975 struct nfs4_lockdata {
3976         struct nfs_lock_args arg;
3977         struct nfs_lock_res res;
3978         struct nfs4_lock_state *lsp;
3979         struct nfs_open_context *ctx;
3980         struct file_lock fl;
3981         unsigned long timestamp;
3982         int rpc_status;
3983         int cancelled;
3984         struct nfs_server *server;
3985 };
3986
3987 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3988                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
3989                 gfp_t gfp_mask)
3990 {
3991         struct nfs4_lockdata *p;
3992         struct inode *inode = lsp->ls_state->inode;
3993         struct nfs_server *server = NFS_SERVER(inode);
3994
3995         p = kzalloc(sizeof(*p), gfp_mask);
3996         if (p == NULL)
3997                 return NULL;
3998
3999         p->arg.fh = NFS_FH(inode);
4000         p->arg.fl = &p->fl;
4001         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4002         if (p->arg.open_seqid == NULL)
4003                 goto out_free;
4004         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4005         if (p->arg.lock_seqid == NULL)
4006                 goto out_free_seqid;
4007         p->arg.lock_stateid = &lsp->ls_stateid;
4008         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4009         p->arg.lock_owner.id = lsp->ls_id.id;
4010         p->res.lock_seqid = p->arg.lock_seqid;
4011         p->lsp = lsp;
4012         p->server = server;
4013         atomic_inc(&lsp->ls_count);
4014         p->ctx = get_nfs_open_context(ctx);
4015         memcpy(&p->fl, fl, sizeof(p->fl));
4016         return p;
4017 out_free_seqid:
4018         nfs_free_seqid(p->arg.open_seqid);
4019 out_free:
4020         kfree(p);
4021         return NULL;
4022 }
4023
4024 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4025 {
4026         struct nfs4_lockdata *data = calldata;
4027         struct nfs4_state *state = data->lsp->ls_state;
4028
4029         dprintk("%s: begin!\n", __func__);
4030         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4031                 return;
4032         /* Do we need to do an open_to_lock_owner? */
4033         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4034                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4035                         return;
4036                 data->arg.open_stateid = &state->stateid;
4037                 data->arg.new_lock_owner = 1;
4038                 data->res.open_seqid = data->arg.open_seqid;
4039         } else
4040                 data->arg.new_lock_owner = 0;
4041         data->timestamp = jiffies;
4042         if (nfs4_setup_sequence(data->server,
4043                                 &data->arg.seq_args,
4044                                 &data->res.seq_res, 1, task))
4045                 return;
4046         rpc_call_start(task);
4047         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4048 }
4049
4050 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4051 {
4052         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4053         nfs4_lock_prepare(task, calldata);
4054 }
4055
4056 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4057 {
4058         struct nfs4_lockdata *data = calldata;
4059
4060         dprintk("%s: begin!\n", __func__);
4061
4062         if (!nfs4_sequence_done(task, &data->res.seq_res))
4063                 return;
4064
4065         data->rpc_status = task->tk_status;
4066         if (data->arg.new_lock_owner != 0) {
4067                 if (data->rpc_status == 0)
4068                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4069                 else
4070                         goto out;
4071         }
4072         if (data->rpc_status == 0) {
4073                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4074                                         sizeof(data->lsp->ls_stateid.data));
4075                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4076                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4077         }
4078 out:
4079         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4080 }
4081
4082 static void nfs4_lock_release(void *calldata)
4083 {
4084         struct nfs4_lockdata *data = calldata;
4085
4086         dprintk("%s: begin!\n", __func__);
4087         nfs_free_seqid(data->arg.open_seqid);
4088         if (data->cancelled != 0) {
4089                 struct rpc_task *task;
4090                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4091                                 data->arg.lock_seqid);
4092                 if (!IS_ERR(task))
4093                         rpc_put_task(task);
4094                 dprintk("%s: cancelling lock!\n", __func__);
4095         } else
4096                 nfs_free_seqid(data->arg.lock_seqid);
4097         nfs4_put_lock_state(data->lsp);
4098         put_nfs_open_context(data->ctx);
4099         kfree(data);
4100         dprintk("%s: done!\n", __func__);
4101 }
4102
4103 static const struct rpc_call_ops nfs4_lock_ops = {
4104         .rpc_call_prepare = nfs4_lock_prepare,
4105         .rpc_call_done = nfs4_lock_done,
4106         .rpc_release = nfs4_lock_release,
4107 };
4108
4109 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4110         .rpc_call_prepare = nfs4_recover_lock_prepare,
4111         .rpc_call_done = nfs4_lock_done,
4112         .rpc_release = nfs4_lock_release,
4113 };
4114
4115 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4116 {
4117         struct nfs_client *clp = server->nfs_client;
4118         struct nfs4_state *state = lsp->ls_state;
4119
4120         switch (error) {
4121         case -NFS4ERR_ADMIN_REVOKED:
4122         case -NFS4ERR_BAD_STATEID:
4123         case -NFS4ERR_EXPIRED:
4124                 if (new_lock_owner != 0 ||
4125                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4126                         nfs4_state_mark_reclaim_nograce(clp, state);
4127                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4128                 break;
4129         case -NFS4ERR_STALE_STATEID:
4130                 if (new_lock_owner != 0 ||
4131                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4132                         nfs4_state_mark_reclaim_reboot(clp, state);
4133                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4134         };
4135 }
4136
4137 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4138 {
4139         struct nfs4_lockdata *data;
4140         struct rpc_task *task;
4141         struct rpc_message msg = {
4142                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4143                 .rpc_cred = state->owner->so_cred,
4144         };
4145         struct rpc_task_setup task_setup_data = {
4146                 .rpc_client = NFS_CLIENT(state->inode),
4147                 .rpc_message = &msg,
4148                 .callback_ops = &nfs4_lock_ops,
4149                 .workqueue = nfsiod_workqueue,
4150                 .flags = RPC_TASK_ASYNC,
4151         };
4152         int ret;
4153
4154         dprintk("%s: begin!\n", __func__);
4155         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4156                         fl->fl_u.nfs4_fl.owner,
4157                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4158         if (data == NULL)
4159                 return -ENOMEM;
4160         if (IS_SETLKW(cmd))
4161                 data->arg.block = 1;
4162         if (recovery_type > NFS_LOCK_NEW) {
4163                 if (recovery_type == NFS_LOCK_RECLAIM)
4164                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4165                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4166         }
4167         msg.rpc_argp = &data->arg;
4168         msg.rpc_resp = &data->res;
4169         task_setup_data.callback_data = data;
4170         task = rpc_run_task(&task_setup_data);
4171         if (IS_ERR(task))
4172                 return PTR_ERR(task);
4173         ret = nfs4_wait_for_completion_rpc_task(task);
4174         if (ret == 0) {
4175                 ret = data->rpc_status;
4176                 if (ret)
4177                         nfs4_handle_setlk_error(data->server, data->lsp,
4178                                         data->arg.new_lock_owner, ret);
4179         } else
4180                 data->cancelled = 1;
4181         rpc_put_task(task);
4182         dprintk("%s: done, ret = %d!\n", __func__, ret);
4183         return ret;
4184 }
4185
4186 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4187 {
4188         struct nfs_server *server = NFS_SERVER(state->inode);
4189         struct nfs4_exception exception = { };
4190         int err;
4191
4192         do {
4193                 /* Cache the lock if possible... */
4194                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4195                         return 0;
4196                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4197                 if (err != -NFS4ERR_DELAY)
4198                         break;
4199                 nfs4_handle_exception(server, err, &exception);
4200         } while (exception.retry);
4201         return err;
4202 }
4203
4204 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4205 {
4206         struct nfs_server *server = NFS_SERVER(state->inode);
4207         struct nfs4_exception exception = { };
4208         int err;
4209
4210         err = nfs4_set_lock_state(state, request);
4211         if (err != 0)
4212                 return err;
4213         do {
4214                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4215                         return 0;
4216                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4217                 switch (err) {
4218                 default:
4219                         goto out;
4220                 case -NFS4ERR_GRACE:
4221                 case -NFS4ERR_DELAY:
4222                         nfs4_handle_exception(server, err, &exception);
4223                         err = 0;
4224                 }
4225         } while (exception.retry);
4226 out:
4227         return err;
4228 }
4229
4230 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4231 {
4232         struct nfs_inode *nfsi = NFS_I(state->inode);
4233         unsigned char fl_flags = request->fl_flags;
4234         int status = -ENOLCK;
4235
4236         if ((fl_flags & FL_POSIX) &&
4237                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4238                 goto out;
4239         /* Is this a delegated open? */
4240         status = nfs4_set_lock_state(state, request);
4241         if (status != 0)
4242                 goto out;
4243         request->fl_flags |= FL_ACCESS;
4244         status = do_vfs_lock(request->fl_file, request);
4245         if (status < 0)
4246                 goto out;
4247         down_read(&nfsi->rwsem);
4248         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4249                 /* Yes: cache locks! */
4250                 /* ...but avoid races with delegation recall... */
4251                 request->fl_flags = fl_flags & ~FL_SLEEP;
4252                 status = do_vfs_lock(request->fl_file, request);
4253                 goto out_unlock;
4254         }
4255         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4256         if (status != 0)
4257                 goto out_unlock;
4258         /* Note: we always want to sleep here! */
4259         request->fl_flags = fl_flags | FL_SLEEP;
4260         if (do_vfs_lock(request->fl_file, request) < 0)
4261                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4262 out_unlock:
4263         up_read(&nfsi->rwsem);
4264 out:
4265         request->fl_flags = fl_flags;
4266         return status;
4267 }
4268
4269 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4270 {
4271         struct nfs4_exception exception = { };
4272         int err;
4273
4274         do {
4275                 err = _nfs4_proc_setlk(state, cmd, request);
4276                 if (err == -NFS4ERR_DENIED)
4277                         err = -EAGAIN;
4278                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4279                                 err, &exception);
4280         } while (exception.retry);
4281         return err;
4282 }
4283
4284 static int
4285 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4286 {
4287         struct nfs_open_context *ctx;
4288         struct nfs4_state *state;
4289         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4290         int status;
4291
4292         /* verify open state */
4293         ctx = nfs_file_open_context(filp);
4294         state = ctx->state;
4295
4296         if (request->fl_start < 0 || request->fl_end < 0)
4297                 return -EINVAL;
4298
4299         if (IS_GETLK(cmd)) {
4300                 if (state != NULL)
4301                         return nfs4_proc_getlk(state, F_GETLK, request);
4302                 return 0;
4303         }
4304
4305         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4306                 return -EINVAL;
4307
4308         if (request->fl_type == F_UNLCK) {
4309                 if (state != NULL)
4310                         return nfs4_proc_unlck(state, cmd, request);
4311                 return 0;
4312         }
4313
4314         if (state == NULL)
4315                 return -ENOLCK;
4316         do {
4317                 status = nfs4_proc_setlk(state, cmd, request);
4318                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4319                         break;
4320                 timeout = nfs4_set_lock_task_retry(timeout);
4321                 status = -ERESTARTSYS;
4322                 if (signalled())
4323                         break;
4324         } while(status < 0);
4325         return status;
4326 }
4327
4328 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4329 {
4330         struct nfs_server *server = NFS_SERVER(state->inode);
4331         struct nfs4_exception exception = { };
4332         int err;
4333
4334         err = nfs4_set_lock_state(state, fl);
4335         if (err != 0)
4336                 goto out;
4337         do {
4338                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4339                 switch (err) {
4340                         default:
4341                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4342                                                 __func__, err);
4343                         case 0:
4344                         case -ESTALE:
4345                                 goto out;
4346                         case -NFS4ERR_EXPIRED:
4347                         case -NFS4ERR_STALE_CLIENTID:
4348                         case -NFS4ERR_STALE_STATEID:
4349                         case -NFS4ERR_BADSESSION:
4350                         case -NFS4ERR_BADSLOT:
4351                         case -NFS4ERR_BAD_HIGH_SLOT:
4352                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4353                         case -NFS4ERR_DEADSESSION:
4354                                 nfs4_schedule_state_recovery(server->nfs_client);
4355                                 goto out;
4356                         case -ERESTARTSYS:
4357                                 /*
4358                                  * The show must go on: exit, but mark the
4359                                  * stateid as needing recovery.
4360                                  */
4361                         case -NFS4ERR_ADMIN_REVOKED:
4362                         case -NFS4ERR_BAD_STATEID:
4363                         case -NFS4ERR_OPENMODE:
4364                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4365                                 err = 0;
4366                                 goto out;
4367                         case -EKEYEXPIRED:
4368                                 /*
4369                                  * User RPCSEC_GSS context has expired.
4370                                  * We cannot recover this stateid now, so
4371                                  * skip it and allow recovery thread to
4372                                  * proceed.
4373                                  */
4374                                 err = 0;
4375                                 goto out;
4376                         case -ENOMEM:
4377                         case -NFS4ERR_DENIED:
4378                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4379                                 err = 0;
4380                                 goto out;
4381                         case -NFS4ERR_DELAY:
4382                                 break;
4383                 }
4384                 err = nfs4_handle_exception(server, err, &exception);
4385         } while (exception.retry);
4386 out:
4387         return err;
4388 }
4389
4390 static void nfs4_release_lockowner_release(void *calldata)
4391 {
4392         kfree(calldata);
4393 }
4394
4395 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4396         .rpc_release = nfs4_release_lockowner_release,
4397 };
4398
4399 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4400 {
4401         struct nfs_server *server = lsp->ls_state->owner->so_server;
4402         struct nfs_release_lockowner_args *args;
4403         struct rpc_message msg = {
4404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4405         };
4406
4407         if (server->nfs_client->cl_mvops->minor_version != 0)
4408                 return;
4409         args = kmalloc(sizeof(*args), GFP_NOFS);
4410         if (!args)
4411                 return;
4412         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4413         args->lock_owner.id = lsp->ls_id.id;
4414         msg.rpc_argp = args;
4415         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4416 }
4417
4418 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4419
4420 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4421                                    const void *buf, size_t buflen,
4422                                    int flags, int type)
4423 {
4424         if (strcmp(key, "") != 0)
4425                 return -EINVAL;
4426
4427         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4428 }
4429
4430 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4431                                    void *buf, size_t buflen, int type)
4432 {
4433         if (strcmp(key, "") != 0)
4434                 return -EINVAL;
4435
4436         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4437 }
4438
4439 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4440                                        size_t list_len, const char *name,
4441                                        size_t name_len, int type)
4442 {
4443         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4444
4445         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4446                 return 0;
4447
4448         if (list && len <= list_len)
4449                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4450         return len;
4451 }
4452
4453 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4454 {
4455         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4456                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4457                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4458                 return;
4459
4460         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4461                 NFS_ATTR_FATTR_NLINK;
4462         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4463         fattr->nlink = 2;
4464 }
4465
4466 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4467                 struct nfs4_fs_locations *fs_locations, struct page *page)
4468 {
4469         struct nfs_server *server = NFS_SERVER(dir);
4470         u32 bitmask[2] = {
4471                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4472                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4473         };
4474         struct nfs4_fs_locations_arg args = {
4475                 .dir_fh = NFS_FH(dir),
4476                 .name = name,
4477                 .page = page,
4478                 .bitmask = bitmask,
4479         };
4480         struct nfs4_fs_locations_res res = {
4481                 .fs_locations = fs_locations,
4482         };
4483         struct rpc_message msg = {
4484                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4485                 .rpc_argp = &args,
4486                 .rpc_resp = &res,
4487         };
4488         int status;
4489
4490         dprintk("%s: start\n", __func__);
4491         nfs_fattr_init(&fs_locations->fattr);
4492         fs_locations->server = server;
4493         fs_locations->nlocations = 0;
4494         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4495         nfs_fixup_referral_attributes(&fs_locations->fattr);
4496         dprintk("%s: returned status = %d\n", __func__, status);
4497         return status;
4498 }
4499
4500 #ifdef CONFIG_NFS_V4_1
4501 /*
4502  * nfs4_proc_exchange_id()
4503  *
4504  * Since the clientid has expired, all compounds using sessions
4505  * associated with the stale clientid will be returning
4506  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4507  * be in some phase of session reset.
4508  */
4509 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4510 {
4511         nfs4_verifier verifier;
4512         struct nfs41_exchange_id_args args = {
4513                 .client = clp,
4514                 .flags = clp->cl_exchange_flags,
4515         };
4516         struct nfs41_exchange_id_res res = {
4517                 .client = clp,
4518         };
4519         int status;
4520         struct rpc_message msg = {
4521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4522                 .rpc_argp = &args,
4523                 .rpc_resp = &res,
4524                 .rpc_cred = cred,
4525         };
4526         __be32 *p;
4527
4528         dprintk("--> %s\n", __func__);
4529         BUG_ON(clp == NULL);
4530
4531         /* Remove server-only flags */
4532         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4533
4534         p = (u32 *)verifier.data;
4535         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4536         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4537         args.verifier = &verifier;
4538
4539         while (1) {
4540                 args.id_len = scnprintf(args.id, sizeof(args.id),
4541                                         "%s/%s %u",
4542                                         clp->cl_ipaddr,
4543                                         rpc_peeraddr2str(clp->cl_rpcclient,
4544                                                          RPC_DISPLAY_ADDR),
4545                                         clp->cl_id_uniquifier);
4546
4547                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4548
4549                 if (status != -NFS4ERR_CLID_INUSE)
4550                         break;
4551
4552                 if (signalled())
4553                         break;
4554
4555                 if (++clp->cl_id_uniquifier == 0)
4556                         break;
4557         }
4558
4559         dprintk("<-- %s status= %d\n", __func__, status);
4560         return status;
4561 }
4562
4563 struct nfs4_get_lease_time_data {
4564         struct nfs4_get_lease_time_args *args;
4565         struct nfs4_get_lease_time_res *res;
4566         struct nfs_client *clp;
4567 };
4568
4569 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4570                                         void *calldata)
4571 {
4572         int ret;
4573         struct nfs4_get_lease_time_data *data =
4574                         (struct nfs4_get_lease_time_data *)calldata;
4575
4576         dprintk("--> %s\n", __func__);
4577         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4578         /* just setup sequence, do not trigger session recovery
4579            since we're invoked within one */
4580         ret = nfs41_setup_sequence(data->clp->cl_session,
4581                                    &data->args->la_seq_args,
4582                                    &data->res->lr_seq_res, 0, task);
4583
4584         BUG_ON(ret == -EAGAIN);
4585         rpc_call_start(task);
4586         dprintk("<-- %s\n", __func__);
4587 }
4588
4589 /*
4590  * Called from nfs4_state_manager thread for session setup, so don't recover
4591  * from sequence operation or clientid errors.
4592  */
4593 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4594 {
4595         struct nfs4_get_lease_time_data *data =
4596                         (struct nfs4_get_lease_time_data *)calldata;
4597
4598         dprintk("--> %s\n", __func__);
4599         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4600                 return;
4601         switch (task->tk_status) {
4602         case -NFS4ERR_DELAY:
4603         case -NFS4ERR_GRACE:
4604                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4605                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4606                 task->tk_status = 0;
4607                 nfs_restart_rpc(task, data->clp);
4608                 return;
4609         }
4610         dprintk("<-- %s\n", __func__);
4611 }
4612
4613 struct rpc_call_ops nfs4_get_lease_time_ops = {
4614         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4615         .rpc_call_done = nfs4_get_lease_time_done,
4616 };
4617
4618 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4619 {
4620         struct rpc_task *task;
4621         struct nfs4_get_lease_time_args args;
4622         struct nfs4_get_lease_time_res res = {
4623                 .lr_fsinfo = fsinfo,
4624         };
4625         struct nfs4_get_lease_time_data data = {
4626                 .args = &args,
4627                 .res = &res,
4628                 .clp = clp,
4629         };
4630         struct rpc_message msg = {
4631                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4632                 .rpc_argp = &args,
4633                 .rpc_resp = &res,
4634         };
4635         struct rpc_task_setup task_setup = {
4636                 .rpc_client = clp->cl_rpcclient,
4637                 .rpc_message = &msg,
4638                 .callback_ops = &nfs4_get_lease_time_ops,
4639                 .callback_data = &data
4640         };
4641         int status;
4642
4643         dprintk("--> %s\n", __func__);
4644         task = rpc_run_task(&task_setup);
4645
4646         if (IS_ERR(task))
4647                 status = PTR_ERR(task);
4648         else {
4649                 status = task->tk_status;
4650                 rpc_put_task(task);
4651         }
4652         dprintk("<-- %s return %d\n", __func__, status);
4653
4654         return status;
4655 }
4656
4657 /*
4658  * Reset a slot table
4659  */
4660 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4661                                  int ivalue)
4662 {
4663         struct nfs4_slot *new = NULL;
4664         int i;
4665         int ret = 0;
4666
4667         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4668                 max_reqs, tbl->max_slots);
4669
4670         /* Does the newly negotiated max_reqs match the existing slot table? */
4671         if (max_reqs != tbl->max_slots) {
4672                 ret = -ENOMEM;
4673                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4674                               GFP_NOFS);
4675                 if (!new)
4676                         goto out;
4677                 ret = 0;
4678                 kfree(tbl->slots);
4679         }
4680         spin_lock(&tbl->slot_tbl_lock);
4681         if (new) {
4682                 tbl->slots = new;
4683                 tbl->max_slots = max_reqs;
4684         }
4685         for (i = 0; i < tbl->max_slots; ++i)
4686                 tbl->slots[i].seq_nr = ivalue;
4687         spin_unlock(&tbl->slot_tbl_lock);
4688         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4689                 tbl, tbl->slots, tbl->max_slots);
4690 out:
4691         dprintk("<-- %s: return %d\n", __func__, ret);
4692         return ret;
4693 }
4694
4695 /*
4696  * Reset the forechannel and backchannel slot tables
4697  */
4698 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4699 {
4700         int status;
4701
4702         status = nfs4_reset_slot_table(&session->fc_slot_table,
4703                         session->fc_attrs.max_reqs, 1);
4704         if (status)
4705                 return status;
4706
4707         status = nfs4_reset_slot_table(&session->bc_slot_table,
4708                         session->bc_attrs.max_reqs, 0);
4709         return status;
4710 }
4711
4712 /* Destroy the slot table */
4713 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4714 {
4715         if (session->fc_slot_table.slots != NULL) {
4716                 kfree(session->fc_slot_table.slots);
4717                 session->fc_slot_table.slots = NULL;
4718         }
4719         if (session->bc_slot_table.slots != NULL) {
4720                 kfree(session->bc_slot_table.slots);
4721                 session->bc_slot_table.slots = NULL;
4722         }
4723         return;
4724 }
4725
4726 /*
4727  * Initialize slot table
4728  */
4729 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4730                 int max_slots, int ivalue)
4731 {
4732         struct nfs4_slot *slot;
4733         int ret = -ENOMEM;
4734
4735         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4736
4737         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4738
4739         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4740         if (!slot)
4741                 goto out;
4742         ret = 0;
4743
4744         spin_lock(&tbl->slot_tbl_lock);
4745         tbl->max_slots = max_slots;
4746         tbl->slots = slot;
4747         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4748         spin_unlock(&tbl->slot_tbl_lock);
4749         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4750                 tbl, tbl->slots, tbl->max_slots);
4751 out:
4752         dprintk("<-- %s: return %d\n", __func__, ret);
4753         return ret;
4754 }
4755
4756 /*
4757  * Initialize the forechannel and backchannel tables
4758  */
4759 static int nfs4_init_slot_tables(struct nfs4_session *session)
4760 {
4761         struct nfs4_slot_table *tbl;
4762         int status = 0;
4763
4764         tbl = &session->fc_slot_table;
4765         if (tbl->slots == NULL) {
4766                 status = nfs4_init_slot_table(tbl,
4767                                 session->fc_attrs.max_reqs, 1);
4768                 if (status)
4769                         return status;
4770         }
4771
4772         tbl = &session->bc_slot_table;
4773         if (tbl->slots == NULL) {
4774                 status = nfs4_init_slot_table(tbl,
4775                                 session->bc_attrs.max_reqs, 0);
4776                 if (status)
4777                         nfs4_destroy_slot_tables(session);
4778         }
4779
4780         return status;
4781 }
4782
4783 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4784 {
4785         struct nfs4_session *session;
4786         struct nfs4_slot_table *tbl;
4787
4788         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4789         if (!session)
4790                 return NULL;
4791
4792         tbl = &session->fc_slot_table;
4793         tbl->highest_used_slotid = -1;
4794         spin_lock_init(&tbl->slot_tbl_lock);
4795         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4796         init_completion(&tbl->complete);
4797
4798         tbl = &session->bc_slot_table;
4799         tbl->highest_used_slotid = -1;
4800         spin_lock_init(&tbl->slot_tbl_lock);
4801         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4802         init_completion(&tbl->complete);
4803
4804         session->session_state = 1<<NFS4_SESSION_INITING;
4805
4806         session->clp = clp;
4807         return session;
4808 }
4809
4810 void nfs4_destroy_session(struct nfs4_session *session)
4811 {
4812         nfs4_proc_destroy_session(session);
4813         dprintk("%s Destroy backchannel for xprt %p\n",
4814                 __func__, session->clp->cl_rpcclient->cl_xprt);
4815         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4816                                 NFS41_BC_MIN_CALLBACKS);
4817         nfs4_destroy_slot_tables(session);
4818         kfree(session);
4819 }
4820
4821 /*
4822  * Initialize the values to be used by the client in CREATE_SESSION
4823  * If nfs4_init_session set the fore channel request and response sizes,
4824  * use them.
4825  *
4826  * Set the back channel max_resp_sz_cached to zero to force the client to
4827  * always set csa_cachethis to FALSE because the current implementation
4828  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4829  */
4830 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4831 {
4832         struct nfs4_session *session = args->client->cl_session;
4833         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4834                      mxresp_sz = session->fc_attrs.max_resp_sz;
4835
4836         if (mxrqst_sz == 0)
4837                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4838         if (mxresp_sz == 0)
4839                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4840         /* Fore channel attributes */
4841         args->fc_attrs.headerpadsz = 0;
4842         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4843         args->fc_attrs.max_resp_sz = mxresp_sz;
4844         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4845         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4846
4847         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4848                 "max_ops=%u max_reqs=%u\n",
4849                 __func__,
4850                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4851                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4852
4853         /* Back channel attributes */
4854         args->bc_attrs.headerpadsz = 0;
4855         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4856         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4857         args->bc_attrs.max_resp_sz_cached = 0;
4858         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4859         args->bc_attrs.max_reqs = 1;
4860
4861         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4862                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4863                 __func__,
4864                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4865                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4866                 args->bc_attrs.max_reqs);
4867 }
4868
4869 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4870 {
4871         struct nfs4_channel_attrs *sent = &args->fc_attrs;
4872         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4873
4874         if (rcvd->headerpadsz > sent->headerpadsz)
4875                 return -EINVAL;
4876         if (rcvd->max_resp_sz > sent->max_resp_sz)
4877                 return -EINVAL;
4878         /*
4879          * Our requested max_ops is the minimum we need; we're not
4880          * prepared to break up compounds into smaller pieces than that.
4881          * So, no point even trying to continue if the server won't
4882          * cooperate:
4883          */
4884         if (rcvd->max_ops < sent->max_ops)
4885                 return -EINVAL;
4886         if (rcvd->max_reqs == 0)
4887                 return -EINVAL;
4888         return 0;
4889 }
4890
4891 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4892 {
4893         struct nfs4_channel_attrs *sent = &args->bc_attrs;
4894         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4895
4896         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4897                 return -EINVAL;
4898         if (rcvd->max_resp_sz < sent->max_resp_sz)
4899                 return -EINVAL;
4900         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4901                 return -EINVAL;
4902         /* These would render the backchannel useless: */
4903         if (rcvd->max_ops  == 0)
4904                 return -EINVAL;
4905         if (rcvd->max_reqs == 0)
4906                 return -EINVAL;
4907         return 0;
4908 }
4909
4910 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4911                                      struct nfs4_session *session)
4912 {
4913         int ret;
4914
4915         ret = nfs4_verify_fore_channel_attrs(args, session);
4916         if (ret)
4917                 return ret;
4918         return nfs4_verify_back_channel_attrs(args, session);
4919 }
4920
4921 static int _nfs4_proc_create_session(struct nfs_client *clp)
4922 {
4923         struct nfs4_session *session = clp->cl_session;
4924         struct nfs41_create_session_args args = {
4925                 .client = clp,
4926                 .cb_program = NFS4_CALLBACK,
4927         };
4928         struct nfs41_create_session_res res = {
4929                 .client = clp,
4930         };
4931         struct rpc_message msg = {
4932                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4933                 .rpc_argp = &args,
4934                 .rpc_resp = &res,
4935         };
4936         int status;
4937
4938         nfs4_init_channel_attrs(&args);
4939         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4940
4941         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4942
4943         if (!status)
4944                 /* Verify the session's negotiated channel_attrs values */
4945                 status = nfs4_verify_channel_attrs(&args, session);
4946         if (!status) {
4947                 /* Increment the clientid slot sequence id */
4948                 clp->cl_seqid++;
4949         }
4950
4951         return status;
4952 }
4953
4954 /*
4955  * Issues a CREATE_SESSION operation to the server.
4956  * It is the responsibility of the caller to verify the session is
4957  * expired before calling this routine.
4958  */
4959 int nfs4_proc_create_session(struct nfs_client *clp)
4960 {
4961         int status;
4962         unsigned *ptr;
4963         struct nfs4_session *session = clp->cl_session;
4964
4965         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4966
4967         status = _nfs4_proc_create_session(clp);
4968         if (status)
4969                 goto out;
4970
4971         /* Init and reset the fore channel */
4972         status = nfs4_init_slot_tables(session);
4973         dprintk("slot table initialization returned %d\n", status);
4974         if (status)
4975                 goto out;
4976         status = nfs4_reset_slot_tables(session);
4977         dprintk("slot table reset returned %d\n", status);
4978         if (status)
4979                 goto out;
4980
4981         ptr = (unsigned *)&session->sess_id.data[0];
4982         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4983                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4984 out:
4985         dprintk("<-- %s\n", __func__);
4986         return status;
4987 }
4988
4989 /*
4990  * Issue the over-the-wire RPC DESTROY_SESSION.
4991  * The caller must serialize access to this routine.
4992  */
4993 int nfs4_proc_destroy_session(struct nfs4_session *session)
4994 {
4995         int status = 0;
4996         struct rpc_message msg;
4997
4998         dprintk("--> nfs4_proc_destroy_session\n");
4999
5000         /* session is still being setup */
5001         if (session->clp->cl_cons_state != NFS_CS_READY)
5002                 return status;
5003
5004         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5005         msg.rpc_argp = session;
5006         msg.rpc_resp = NULL;
5007         msg.rpc_cred = NULL;
5008         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5009
5010         if (status)
5011                 printk(KERN_WARNING
5012                         "Got error %d from the server on DESTROY_SESSION. "
5013                         "Session has been destroyed regardless...\n", status);
5014
5015         dprintk("<-- nfs4_proc_destroy_session\n");
5016         return status;
5017 }
5018
5019 int nfs4_init_session(struct nfs_server *server)
5020 {
5021         struct nfs_client *clp = server->nfs_client;
5022         struct nfs4_session *session;
5023         unsigned int rsize, wsize;
5024         int ret;
5025
5026         if (!nfs4_has_session(clp))
5027                 return 0;
5028
5029         session = clp->cl_session;
5030         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5031                 return 0;
5032
5033         rsize = server->rsize;
5034         if (rsize == 0)
5035                 rsize = NFS_MAX_FILE_IO_SIZE;
5036         wsize = server->wsize;
5037         if (wsize == 0)
5038                 wsize = NFS_MAX_FILE_IO_SIZE;
5039
5040         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5041         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5042
5043         ret = nfs4_recover_expired_lease(server);
5044         if (!ret)
5045                 ret = nfs4_check_client_ready(clp);
5046         return ret;
5047 }
5048
5049 /*
5050  * Renew the cl_session lease.
5051  */
5052 struct nfs4_sequence_data {
5053         struct nfs_client *clp;
5054         struct nfs4_sequence_args args;
5055         struct nfs4_sequence_res res;
5056 };
5057
5058 static void nfs41_sequence_release(void *data)
5059 {
5060         struct nfs4_sequence_data *calldata = data;
5061         struct nfs_client *clp = calldata->clp;
5062
5063         if (atomic_read(&clp->cl_count) > 1)
5064                 nfs4_schedule_state_renewal(clp);
5065         nfs_put_client(clp);
5066         kfree(calldata);
5067 }
5068
5069 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5070 {
5071         switch(task->tk_status) {
5072         case -NFS4ERR_DELAY:
5073                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5074                 return -EAGAIN;
5075         default:
5076                 nfs4_schedule_state_recovery(clp);
5077         }
5078         return 0;
5079 }
5080
5081 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5082 {
5083         struct nfs4_sequence_data *calldata = data;
5084         struct nfs_client *clp = calldata->clp;
5085
5086         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5087                 return;
5088
5089         if (task->tk_status < 0) {
5090                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5091                 if (atomic_read(&clp->cl_count) == 1)
5092                         goto out;
5093
5094                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5095                         rpc_restart_call_prepare(task);
5096                         return;
5097                 }
5098         }
5099         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5100 out:
5101         dprintk("<-- %s\n", __func__);
5102 }
5103
5104 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5105 {
5106         struct nfs4_sequence_data *calldata = data;
5107         struct nfs_client *clp = calldata->clp;
5108         struct nfs4_sequence_args *args;
5109         struct nfs4_sequence_res *res;
5110
5111         args = task->tk_msg.rpc_argp;
5112         res = task->tk_msg.rpc_resp;
5113
5114         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5115                 return;
5116         rpc_call_start(task);
5117 }
5118
5119 static const struct rpc_call_ops nfs41_sequence_ops = {
5120         .rpc_call_done = nfs41_sequence_call_done,
5121         .rpc_call_prepare = nfs41_sequence_prepare,
5122         .rpc_release = nfs41_sequence_release,
5123 };
5124
5125 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5126 {
5127         struct nfs4_sequence_data *calldata;
5128         struct rpc_message msg = {
5129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5130                 .rpc_cred = cred,
5131         };
5132         struct rpc_task_setup task_setup_data = {
5133                 .rpc_client = clp->cl_rpcclient,
5134                 .rpc_message = &msg,
5135                 .callback_ops = &nfs41_sequence_ops,
5136                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5137         };
5138
5139         if (!atomic_inc_not_zero(&clp->cl_count))
5140                 return ERR_PTR(-EIO);
5141         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5142         if (calldata == NULL) {
5143                 nfs_put_client(clp);
5144                 return ERR_PTR(-ENOMEM);
5145         }
5146         msg.rpc_argp = &calldata->args;
5147         msg.rpc_resp = &calldata->res;
5148         calldata->clp = clp;
5149         task_setup_data.callback_data = calldata;
5150
5151         return rpc_run_task(&task_setup_data);
5152 }
5153
5154 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5155 {
5156         struct rpc_task *task;
5157         int ret = 0;
5158
5159         task = _nfs41_proc_sequence(clp, cred);
5160         if (IS_ERR(task))
5161                 ret = PTR_ERR(task);
5162         else
5163                 rpc_put_task(task);
5164         dprintk("<-- %s status=%d\n", __func__, ret);
5165         return ret;
5166 }
5167
5168 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5169 {
5170         struct rpc_task *task;
5171         int ret;
5172
5173         task = _nfs41_proc_sequence(clp, cred);
5174         if (IS_ERR(task)) {
5175                 ret = PTR_ERR(task);
5176                 goto out;
5177         }
5178         ret = rpc_wait_for_completion_task(task);
5179         if (!ret)
5180                 ret = task->tk_status;
5181         rpc_put_task(task);
5182 out:
5183         dprintk("<-- %s status=%d\n", __func__, ret);
5184         return ret;
5185 }
5186
5187 struct nfs4_reclaim_complete_data {
5188         struct nfs_client *clp;
5189         struct nfs41_reclaim_complete_args arg;
5190         struct nfs41_reclaim_complete_res res;
5191 };
5192
5193 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5194 {
5195         struct nfs4_reclaim_complete_data *calldata = data;
5196
5197         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5198         if (nfs41_setup_sequence(calldata->clp->cl_session,
5199                                 &calldata->arg.seq_args,
5200                                 &calldata->res.seq_res, 0, task))
5201                 return;
5202
5203         rpc_call_start(task);
5204 }
5205
5206 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5207 {
5208         switch(task->tk_status) {
5209         case 0:
5210         case -NFS4ERR_COMPLETE_ALREADY:
5211         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5212                 break;
5213         case -NFS4ERR_DELAY:
5214                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5215                 return -EAGAIN;
5216         default:
5217                 nfs4_schedule_state_recovery(clp);
5218         }
5219         return 0;
5220 }
5221
5222 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5223 {
5224         struct nfs4_reclaim_complete_data *calldata = data;
5225         struct nfs_client *clp = calldata->clp;
5226         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5227
5228         dprintk("--> %s\n", __func__);
5229         if (!nfs41_sequence_done(task, res))
5230                 return;
5231
5232         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5233                 rpc_restart_call_prepare(task);
5234                 return;
5235         }
5236         dprintk("<-- %s\n", __func__);
5237 }
5238
5239 static void nfs4_free_reclaim_complete_data(void *data)
5240 {
5241         struct nfs4_reclaim_complete_data *calldata = data;
5242
5243         kfree(calldata);
5244 }
5245
5246 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5247         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5248         .rpc_call_done = nfs4_reclaim_complete_done,
5249         .rpc_release = nfs4_free_reclaim_complete_data,
5250 };
5251
5252 /*
5253  * Issue a global reclaim complete.
5254  */
5255 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5256 {
5257         struct nfs4_reclaim_complete_data *calldata;
5258         struct rpc_task *task;
5259         struct rpc_message msg = {
5260                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5261         };
5262         struct rpc_task_setup task_setup_data = {
5263                 .rpc_client = clp->cl_rpcclient,
5264                 .rpc_message = &msg,
5265                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5266                 .flags = RPC_TASK_ASYNC,
5267         };
5268         int status = -ENOMEM;
5269
5270         dprintk("--> %s\n", __func__);
5271         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5272         if (calldata == NULL)
5273                 goto out;
5274         calldata->clp = clp;
5275         calldata->arg.one_fs = 0;
5276
5277         msg.rpc_argp = &calldata->arg;
5278         msg.rpc_resp = &calldata->res;
5279         task_setup_data.callback_data = calldata;
5280         task = rpc_run_task(&task_setup_data);
5281         if (IS_ERR(task)) {
5282                 status = PTR_ERR(task);
5283                 goto out;
5284         }
5285         rpc_put_task(task);
5286         return 0;
5287 out:
5288         dprintk("<-- %s status=%d\n", __func__, status);
5289         return status;
5290 }
5291
5292 static void
5293 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5294 {
5295         struct nfs4_layoutget *lgp = calldata;
5296         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5297
5298         dprintk("--> %s\n", __func__);
5299         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5300          * right now covering the LAYOUTGET we are about to send.
5301          * However, that is not so catastrophic, and there seems
5302          * to be no way to prevent it completely.
5303          */
5304         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5305                                 &lgp->res.seq_res, 0, task))
5306                 return;
5307         rpc_call_start(task);
5308 }
5309
5310 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5311 {
5312         struct nfs4_layoutget *lgp = calldata;
5313         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5314
5315         dprintk("--> %s\n", __func__);
5316
5317         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5318                 return;
5319
5320         switch (task->tk_status) {
5321         case 0:
5322                 break;
5323         case -NFS4ERR_LAYOUTTRYLATER:
5324         case -NFS4ERR_RECALLCONFLICT:
5325                 task->tk_status = -NFS4ERR_DELAY;
5326                 /* Fall through */
5327         default:
5328                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5329                         rpc_restart_call_prepare(task);
5330                         return;
5331                 }
5332         }
5333         dprintk("<-- %s\n", __func__);
5334 }
5335
5336 static void nfs4_layoutget_release(void *calldata)
5337 {
5338         struct nfs4_layoutget *lgp = calldata;
5339
5340         dprintk("--> %s\n", __func__);
5341         put_layout_hdr(lgp->args.inode);
5342         if (lgp->res.layout.buf != NULL)
5343                 free_page((unsigned long) lgp->res.layout.buf);
5344         put_nfs_open_context(lgp->args.ctx);
5345         kfree(calldata);
5346         dprintk("<-- %s\n", __func__);
5347 }
5348
5349 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5350         .rpc_call_prepare = nfs4_layoutget_prepare,
5351         .rpc_call_done = nfs4_layoutget_done,
5352         .rpc_release = nfs4_layoutget_release,
5353 };
5354
5355 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5356 {
5357         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5358         struct rpc_task *task;
5359         struct rpc_message msg = {
5360                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5361                 .rpc_argp = &lgp->args,
5362                 .rpc_resp = &lgp->res,
5363         };
5364         struct rpc_task_setup task_setup_data = {
5365                 .rpc_client = server->client,
5366                 .rpc_message = &msg,
5367                 .callback_ops = &nfs4_layoutget_call_ops,
5368                 .callback_data = lgp,
5369                 .flags = RPC_TASK_ASYNC,
5370         };
5371         int status = 0;
5372
5373         dprintk("--> %s\n", __func__);
5374
5375         lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5376         if (lgp->res.layout.buf == NULL) {
5377                 nfs4_layoutget_release(lgp);
5378                 return -ENOMEM;
5379         }
5380
5381         lgp->res.seq_res.sr_slot = NULL;
5382         task = rpc_run_task(&task_setup_data);
5383         if (IS_ERR(task))
5384                 return PTR_ERR(task);
5385         status = nfs4_wait_for_completion_rpc_task(task);
5386         if (status == 0)
5387                 status = task->tk_status;
5388         if (status == 0)
5389                 status = pnfs_layout_process(lgp);
5390         rpc_put_task(task);
5391         dprintk("<-- %s status=%d\n", __func__, status);
5392         return status;
5393 }
5394
5395 static int
5396 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5397 {
5398         struct nfs4_getdeviceinfo_args args = {
5399                 .pdev = pdev,
5400         };
5401         struct nfs4_getdeviceinfo_res res = {
5402                 .pdev = pdev,
5403         };
5404         struct rpc_message msg = {
5405                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5406                 .rpc_argp = &args,
5407                 .rpc_resp = &res,
5408         };
5409         int status;
5410
5411         dprintk("--> %s\n", __func__);
5412         status = nfs4_call_sync(server, &msg, &args, &res, 0);
5413         dprintk("<-- %s status=%d\n", __func__, status);
5414
5415         return status;
5416 }
5417
5418 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5419 {
5420         struct nfs4_exception exception = { };
5421         int err;
5422
5423         do {
5424                 err = nfs4_handle_exception(server,
5425                                         _nfs4_proc_getdeviceinfo(server, pdev),
5426                                         &exception);
5427         } while (exception.retry);
5428         return err;
5429 }
5430 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5431
5432 #endif /* CONFIG_NFS_V4_1 */
5433
5434 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5435         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5436         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5437         .recover_open   = nfs4_open_reclaim,
5438         .recover_lock   = nfs4_lock_reclaim,
5439         .establish_clid = nfs4_init_clientid,
5440         .get_clid_cred  = nfs4_get_setclientid_cred,
5441 };
5442
5443 #if defined(CONFIG_NFS_V4_1)
5444 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5445         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5446         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5447         .recover_open   = nfs4_open_reclaim,
5448         .recover_lock   = nfs4_lock_reclaim,
5449         .establish_clid = nfs41_init_clientid,
5450         .get_clid_cred  = nfs4_get_exchange_id_cred,
5451         .reclaim_complete = nfs41_proc_reclaim_complete,
5452 };
5453 #endif /* CONFIG_NFS_V4_1 */
5454
5455 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5456         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5457         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5458         .recover_open   = nfs4_open_expired,
5459         .recover_lock   = nfs4_lock_expired,
5460         .establish_clid = nfs4_init_clientid,
5461         .get_clid_cred  = nfs4_get_setclientid_cred,
5462 };
5463
5464 #if defined(CONFIG_NFS_V4_1)
5465 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5466         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5467         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5468         .recover_open   = nfs4_open_expired,
5469         .recover_lock   = nfs4_lock_expired,
5470         .establish_clid = nfs41_init_clientid,
5471         .get_clid_cred  = nfs4_get_exchange_id_cred,
5472 };
5473 #endif /* CONFIG_NFS_V4_1 */
5474
5475 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5476         .sched_state_renewal = nfs4_proc_async_renew,
5477         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5478         .renew_lease = nfs4_proc_renew,
5479 };
5480
5481 #if defined(CONFIG_NFS_V4_1)
5482 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5483         .sched_state_renewal = nfs41_proc_async_sequence,
5484         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5485         .renew_lease = nfs4_proc_sequence,
5486 };
5487 #endif
5488
5489 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5490         .minor_version = 0,
5491         .call_sync = _nfs4_call_sync,
5492         .validate_stateid = nfs4_validate_delegation_stateid,
5493         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5494         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5495         .state_renewal_ops = &nfs40_state_renewal_ops,
5496 };
5497
5498 #if defined(CONFIG_NFS_V4_1)
5499 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5500         .minor_version = 1,
5501         .call_sync = _nfs4_call_sync_session,
5502         .validate_stateid = nfs41_validate_delegation_stateid,
5503         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5504         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5505         .state_renewal_ops = &nfs41_state_renewal_ops,
5506 };
5507 #endif
5508
5509 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5510         [0] = &nfs_v4_0_minor_ops,
5511 #if defined(CONFIG_NFS_V4_1)
5512         [1] = &nfs_v4_1_minor_ops,
5513 #endif
5514 };
5515
5516 static const struct inode_operations nfs4_file_inode_operations = {
5517         .permission     = nfs_permission,
5518         .getattr        = nfs_getattr,
5519         .setattr        = nfs_setattr,
5520         .getxattr       = generic_getxattr,
5521         .setxattr       = generic_setxattr,
5522         .listxattr      = generic_listxattr,
5523         .removexattr    = generic_removexattr,
5524 };
5525
5526 const struct nfs_rpc_ops nfs_v4_clientops = {
5527         .version        = 4,                    /* protocol version */
5528         .dentry_ops     = &nfs4_dentry_operations,
5529         .dir_inode_ops  = &nfs4_dir_inode_operations,
5530         .file_inode_ops = &nfs4_file_inode_operations,
5531         .getroot        = nfs4_proc_get_root,
5532         .getattr        = nfs4_proc_getattr,
5533         .setattr        = nfs4_proc_setattr,
5534         .lookupfh       = nfs4_proc_lookupfh,
5535         .lookup         = nfs4_proc_lookup,
5536         .access         = nfs4_proc_access,
5537         .readlink       = nfs4_proc_readlink,
5538         .create         = nfs4_proc_create,
5539         .remove         = nfs4_proc_remove,
5540         .unlink_setup   = nfs4_proc_unlink_setup,
5541         .unlink_done    = nfs4_proc_unlink_done,
5542         .rename         = nfs4_proc_rename,
5543         .rename_setup   = nfs4_proc_rename_setup,
5544         .rename_done    = nfs4_proc_rename_done,
5545         .link           = nfs4_proc_link,
5546         .symlink        = nfs4_proc_symlink,
5547         .mkdir          = nfs4_proc_mkdir,
5548         .rmdir          = nfs4_proc_remove,
5549         .readdir        = nfs4_proc_readdir,
5550         .mknod          = nfs4_proc_mknod,
5551         .statfs         = nfs4_proc_statfs,
5552         .fsinfo         = nfs4_proc_fsinfo,
5553         .pathconf       = nfs4_proc_pathconf,
5554         .set_capabilities = nfs4_server_capabilities,
5555         .decode_dirent  = nfs4_decode_dirent,
5556         .read_setup     = nfs4_proc_read_setup,
5557         .read_done      = nfs4_read_done,
5558         .write_setup    = nfs4_proc_write_setup,
5559         .write_done     = nfs4_write_done,
5560         .commit_setup   = nfs4_proc_commit_setup,
5561         .commit_done    = nfs4_commit_done,
5562         .lock           = nfs4_proc_lock,
5563         .clear_acl_cache = nfs4_zap_acl_attr,
5564         .close_context  = nfs4_close_context,
5565         .open_context   = nfs4_atomic_open,
5566 };
5567
5568 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
5569         .prefix = XATTR_NAME_NFSV4_ACL,
5570         .list   = nfs4_xattr_list_nfs4_acl,
5571         .get    = nfs4_xattr_get_nfs4_acl,
5572         .set    = nfs4_xattr_set_nfs4_acl,
5573 };
5574
5575 const struct xattr_handler *nfs4_xattr_handlers[] = {
5576         &nfs4_xattr_nfs4_acl_handler,
5577         NULL
5578 };
5579
5580 /*
5581  * Local variables:
5582  *  c-basic-offset: 8
5583  * End:
5584  */