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/sunrpc/clnt.h>
  43 #include <linux/nfs.h>
  44 #include <linux/nfs4.h>
  45 #include <linux/nfs_fs.h>
  46 #include <linux/nfs_page.h>
  47 #include <linux/namei.h>
  48 #include <linux/mount.h>
  49 #include <linux/module.h>
  50 #include <linux/sunrpc/bc_xprt.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56 #include "callback.h"
  57
  58 #define NFSDBG_FACILITY         NFSDBG_PROC
  59
  60 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  61 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  62
  63 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  64
  65 struct nfs4_opendata;
  66 static int _nfs4_proc_open(struct nfs4_opendata *data);
  67 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  68 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  69 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  71
  72 /* Prevent leaks of NFSv4 errors into userland */
  73 static int nfs4_map_errors(int err)
  74 {
  75         if (err >= -1000)
  76                 return err;
  77         switch (err) {
  78         case -NFS4ERR_RESOURCE:
  79                 return -EREMOTEIO;
  80         default:
  81                 dprintk("%s could not handle NFSv4 error %d\n",
  82                                 __func__, -err);
  83                 break;
  84         }
  85         return -EIO;
  86 }
  87
  88 /*
  89  * This is our standard bitmap for GETATTR requests.
  90  */
  91 const u32 nfs4_fattr_bitmap[2] = {
  92         FATTR4_WORD0_TYPE
  93         | FATTR4_WORD0_CHANGE
  94         | FATTR4_WORD0_SIZE
  95         | FATTR4_WORD0_FSID
  96         | FATTR4_WORD0_FILEID,
  97         FATTR4_WORD1_MODE
  98         | FATTR4_WORD1_NUMLINKS
  99         | FATTR4_WORD1_OWNER
 100         | FATTR4_WORD1_OWNER_GROUP
 101         | FATTR4_WORD1_RAWDEV
 102         | FATTR4_WORD1_SPACE_USED
 103         | FATTR4_WORD1_TIME_ACCESS
 104         | FATTR4_WORD1_TIME_METADATA
 105         | FATTR4_WORD1_TIME_MODIFY
 106 };
 107
 108 const u32 nfs4_statfs_bitmap[2] = {
 109         FATTR4_WORD0_FILES_AVAIL
 110         | FATTR4_WORD0_FILES_FREE
 111         | FATTR4_WORD0_FILES_TOTAL,
 112         FATTR4_WORD1_SPACE_AVAIL
 113         | FATTR4_WORD1_SPACE_FREE
 114         | FATTR4_WORD1_SPACE_TOTAL
 115 };
 116
 117 const u32 nfs4_pathconf_bitmap[2] = {
 118         FATTR4_WORD0_MAXLINK
 119         | FATTR4_WORD0_MAXNAME,
 120         0
 121 };
 122
 123 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 124                         | FATTR4_WORD0_MAXREAD
 125                         | FATTR4_WORD0_MAXWRITE
 126                         | FATTR4_WORD0_LEASE_TIME,
 127                         0
 128 };
 129
 130 const u32 nfs4_fs_locations_bitmap[2] = {
 131         FATTR4_WORD0_TYPE
 132         | FATTR4_WORD0_CHANGE
 133         | FATTR4_WORD0_SIZE
 134         | FATTR4_WORD0_FSID
 135         | FATTR4_WORD0_FILEID
 136         | FATTR4_WORD0_FS_LOCATIONS,
 137         FATTR4_WORD1_MODE
 138         | FATTR4_WORD1_NUMLINKS
 139         | FATTR4_WORD1_OWNER
 140         | FATTR4_WORD1_OWNER_GROUP
 141         | FATTR4_WORD1_RAWDEV
 142         | FATTR4_WORD1_SPACE_USED
 143         | FATTR4_WORD1_TIME_ACCESS
 144         | FATTR4_WORD1_TIME_METADATA
 145         | FATTR4_WORD1_TIME_MODIFY
 146         | FATTR4_WORD1_MOUNTED_ON_FILEID
 147 };
 148
 149 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 150                 struct nfs4_readdir_arg *readdir)
 151 {
 152         __be32 *start, *p;
 153
 154         BUG_ON(readdir->count < 80);
 155         if (cookie > 2) {
 156                 readdir->cookie = cookie;
 157                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 158                 return;
 159         }
 160
 161         readdir->cookie = 0;
 162         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 163         if (cookie == 2)
 164                 return;
 165
 166         /*
 167          * NFSv4 servers do not return entries for '.' and '..'
 168          * Therefore, we fake these entries here.  We let '.'
 169          * have cookie 0 and '..' have cookie 1.  Note that
 170          * when talking to the server, we always send cookie 0
 171          * instead of 1 or 2.
 172          */
 173         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 174
 175         if (cookie == 0) {
 176                 *p++ = xdr_one;                                  /* next */
 177                 *p++ = xdr_zero;                   /* cookie, first word */
 178                 *p++ = xdr_one;                   /* cookie, second word */
 179                 *p++ = xdr_one;                             /* entry len */
 180                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 181                 p++;
 182                 *p++ = xdr_one;                         /* bitmap length */
 183                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 184                 *p++ = htonl(8);              /* attribute buffer length */
 185                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 186         }
 187
 188         *p++ = xdr_one;                                  /* next */
 189         *p++ = xdr_zero;                   /* cookie, first word */
 190         *p++ = xdr_two;                   /* cookie, second word */
 191         *p++ = xdr_two;                             /* entry len */
 192         memcpy(p, "..\0\0", 4);                         /* entry */
 193         p++;
 194         *p++ = xdr_one;                         /* bitmap length */
 195         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 196         *p++ = htonl(8);              /* attribute buffer length */
 197         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 198
 199         readdir->pgbase = (char *)p - (char *)start;
 200         readdir->count -= readdir->pgbase;
 201         kunmap_atomic(start, KM_USER0);
 202 }
 203
 204 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 205 {
 206         int res;
 207
 208         might_sleep();
 209
 210         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 211                         nfs_wait_bit_killable, TASK_KILLABLE);
 212         return res;
 213 }
 214
 215 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 216 {
 217         int res = 0;
 218
 219         might_sleep();
 220
 221         if (*timeout <= 0)
 222                 *timeout = NFS4_POLL_RETRY_MIN;
 223         if (*timeout > NFS4_POLL_RETRY_MAX)
 224                 *timeout = NFS4_POLL_RETRY_MAX;
 225         schedule_timeout_killable(*timeout);
 226         if (fatal_signal_pending(current))
 227                 res = -ERESTARTSYS;
 228         *timeout <<= 1;
 229         return res;
 230 }
 231
 232 /* This is the error handling routine for processes that are allowed
 233  * to sleep.
 234  */
 235 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 236 {
 237         struct nfs_client *clp = server->nfs_client;
 238         struct nfs4_state *state = exception->state;
 239         int ret = errorcode;
 240
 241         exception->retry = 0;
 242         switch(errorcode) {
 243                 case 0:
 244                         return 0;
 245                 case -NFS4ERR_ADMIN_REVOKED:
 246                 case -NFS4ERR_BAD_STATEID:
 247                 case -NFS4ERR_OPENMODE:
 248                         if (state == NULL)
 249                                 break;
 250                         nfs4_state_mark_reclaim_nograce(clp, state);
 251                 case -NFS4ERR_STALE_CLIENTID:
 252                 case -NFS4ERR_STALE_STATEID:
 253                 case -NFS4ERR_EXPIRED:
 254                         nfs4_schedule_state_recovery(clp);
 255                         ret = nfs4_wait_clnt_recover(clp);
 256                         if (ret == 0)
 257                                 exception->retry = 1;
 258 #if !defined(CONFIG_NFS_V4_1)
 259                         break;
 260 #else /* !defined(CONFIG_NFS_V4_1) */
 261                         if (!nfs4_has_session(server->nfs_client))
 262                                 break;
 263                         /* FALLTHROUGH */
 264                 case -NFS4ERR_BADSESSION:
 265                 case -NFS4ERR_BADSLOT:
 266                 case -NFS4ERR_BAD_HIGH_SLOT:
 267                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 268                 case -NFS4ERR_DEADSESSION:
 269                 case -NFS4ERR_SEQ_FALSE_RETRY:
 270                 case -NFS4ERR_SEQ_MISORDERED:
 271                         dprintk("%s ERROR: %d Reset session\n", __func__,
 272                                 errorcode);
 273                         nfs4_schedule_state_recovery(clp);
 274                         exception->retry = 1;
 275                         break;
 276 #endif /* !defined(CONFIG_NFS_V4_1) */
 277                 case -NFS4ERR_FILE_OPEN:
 278                         if (exception->timeout > HZ) {
 279                                 /* We have retried a decent amount, time to
 280                                  * fail
 281                                  */
 282                                 ret = -EBUSY;
 283                                 break;
 284                         }
 285                 case -NFS4ERR_GRACE:
 286                 case -NFS4ERR_DELAY:
 287                         ret = nfs4_delay(server->client, &exception->timeout);
 288                         if (ret != 0)
 289                                 break;
 290                 case -NFS4ERR_OLD_STATEID:
 291                         exception->retry = 1;
 292         }
 293         /* We failed to handle the error */
 294         return nfs4_map_errors(ret);
 295 }
 296
 297
 298 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 299 {
 300         struct nfs_client *clp = server->nfs_client;
 301         spin_lock(&clp->cl_lock);
 302         if (time_before(clp->cl_last_renewal,timestamp))
 303                 clp->cl_last_renewal = timestamp;
 304         spin_unlock(&clp->cl_lock);
 305 }
 306
 307 #if defined(CONFIG_NFS_V4_1)
 308
 309 /*
 310  * nfs4_free_slot - free a slot and efficiently update slot table.
 311  *
 312  * freeing a slot is trivially done by clearing its respective bit
 313  * in the bitmap.
 314  * If the freed slotid equals highest_used_slotid we want to update it
 315  * so that the server would be able to size down the slot table if needed,
 316  * otherwise we know that the highest_used_slotid is still in use.
 317  * When updating highest_used_slotid there may be "holes" in the bitmap
 318  * so we need to scan down from highest_used_slotid to 0 looking for the now
 319  * highest slotid in use.
 320  * If none found, highest_used_slotid is set to -1.
 321  *
 322  * Must be called while holding tbl->slot_tbl_lock
 323  */
 324 static void
 325 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 326 {
 327         int slotid = free_slotid;
 328
 329         /* clear used bit in bitmap */
 330         __clear_bit(slotid, tbl->used_slots);
 331
 332         /* update highest_used_slotid when it is freed */
 333         if (slotid == tbl->highest_used_slotid) {
 334                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 335                 if (slotid < tbl->max_slots)
 336                         tbl->highest_used_slotid = slotid;
 337                 else
 338                         tbl->highest_used_slotid = -1;
 339         }
 340         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 341                 free_slotid, tbl->highest_used_slotid);
 342 }
 343
 344 static void nfs41_sequence_free_slot(const struct nfs_client *clp,
 345                               struct nfs4_sequence_res *res)
 346 {
 347         struct nfs4_slot_table *tbl;
 348
 349         tbl = &clp->cl_session->fc_slot_table;
 350         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 351                 /* just wake up the next guy waiting since
 352                  * we may have not consumed a slot after all */
 353                 dprintk("%s: No slot\n", __func__);
 354                 return;
 355         }
 356
 357         spin_lock(&tbl->slot_tbl_lock);
 358         nfs4_free_slot(tbl, res->sr_slotid);
 359
 360         /* Signal state manager thread if session is drained */
 361         if (test_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
 362                 if (tbl->highest_used_slotid == -1) {
 363                         dprintk("%s COMPLETE: Session Drained\n", __func__);
 364                         complete(&clp->cl_session->complete);
 365                 }
 366         } else
 367                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 368         spin_unlock(&tbl->slot_tbl_lock);
 369         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 370 }
 371
 372 static void nfs41_sequence_done(struct nfs_client *clp,
 373                                 struct nfs4_sequence_res *res,
 374                                 int rpc_status)
 375 {
 376         unsigned long timestamp;
 377         struct nfs4_slot_table *tbl;
 378         struct nfs4_slot *slot;
 379
 380         /*
 381          * sr_status remains 1 if an RPC level error occurred. The server
 382          * may or may not have processed the sequence operation..
 383          * Proceed as if the server received and processed the sequence
 384          * operation.
 385          */
 386         if (res->sr_status == 1)
 387                 res->sr_status = NFS_OK;
 388
 389         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 390         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 391                 goto out;
 392
 393         /* Check the SEQUENCE operation status */
 394         if (res->sr_status == 0) {
 395                 tbl = &clp->cl_session->fc_slot_table;
 396                 slot = tbl->slots + res->sr_slotid;
 397                 /* Update the slot's sequence and clientid lease timer */
 398                 ++slot->seq_nr;
 399                 timestamp = res->sr_renewal_time;
 400                 spin_lock(&clp->cl_lock);
 401                 if (time_before(clp->cl_last_renewal, timestamp))
 402                         clp->cl_last_renewal = timestamp;
 403                 spin_unlock(&clp->cl_lock);
 404                 /* Check sequence flags */
 405                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 406         }
 407 out:
 408         /* The session may be reset by one of the error handlers. */
 409         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 410         nfs41_sequence_free_slot(clp, res);
 411 }
 412
 413 /*
 414  * nfs4_find_slot - efficiently look for a free slot
 415  *
 416  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 417  * If found, we mark the slot as used, update the highest_used_slotid,
 418  * and respectively set up the sequence operation args.
 419  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 420  *
 421  * Note: must be called with under the slot_tbl_lock.
 422  */
 423 static u8
 424 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
 425 {
 426         int slotid;
 427         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 428         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 429
 430         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 431                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 432                 tbl->max_slots);
 433         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 434         if (slotid >= tbl->max_slots)
 435                 goto out;
 436         __set_bit(slotid, tbl->used_slots);
 437         if (slotid > tbl->highest_used_slotid)
 438                 tbl->highest_used_slotid = slotid;
 439         ret_id = slotid;
 440 out:
 441         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 442                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 443         return ret_id;
 444 }
 445
 446 static int nfs41_setup_sequence(struct nfs4_session *session,
 447                                 struct nfs4_sequence_args *args,
 448                                 struct nfs4_sequence_res *res,
 449                                 int cache_reply,
 450                                 struct rpc_task *task)
 451 {
 452         struct nfs4_slot *slot;
 453         struct nfs4_slot_table *tbl;
 454         u8 slotid;
 455
 456         dprintk("--> %s\n", __func__);
 457         /* slot already allocated? */
 458         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 459                 return 0;
 460
 461         memset(res, 0, sizeof(*res));
 462         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 463         tbl = &session->fc_slot_table;
 464
 465         spin_lock(&tbl->slot_tbl_lock);
 466         if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state)) {
 467                 /*
 468                  * The state manager will wait until the slot table is empty.
 469                  * Schedule the reset thread
 470                  */
 471                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 472                 spin_unlock(&tbl->slot_tbl_lock);
 473                 dprintk("%s Schedule Session Reset\n", __func__);
 474                 return -EAGAIN;
 475         }
 476
 477         slotid = nfs4_find_slot(tbl, task);
 478         if (slotid == NFS4_MAX_SLOT_TABLE) {
 479                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 480                 spin_unlock(&tbl->slot_tbl_lock);
 481                 dprintk("<-- %s: no free slots\n", __func__);
 482                 return -EAGAIN;
 483         }
 484         spin_unlock(&tbl->slot_tbl_lock);
 485
 486         slot = tbl->slots + slotid;
 487         args->sa_session = session;
 488         args->sa_slotid = slotid;
 489         args->sa_cache_this = cache_reply;
 490
 491         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 492
 493         res->sr_session = session;
 494         res->sr_slotid = slotid;
 495         res->sr_renewal_time = jiffies;
 496         /*
 497          * sr_status is only set in decode_sequence, and so will remain
 498          * set to 1 if an rpc level failure occurs.
 499          */
 500         res->sr_status = 1;
 501         return 0;
 502 }
 503
 504 int nfs4_setup_sequence(struct nfs_client *clp,
 505                         struct nfs4_sequence_args *args,
 506                         struct nfs4_sequence_res *res,
 507                         int cache_reply,
 508                         struct rpc_task *task)
 509 {
 510         int ret = 0;
 511
 512         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 513                 __func__, clp, clp->cl_session, res->sr_slotid);
 514
 515         if (!nfs4_has_session(clp))
 516                 goto out;
 517         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
 518                                    task);
 519         if (ret && ret != -EAGAIN) {
 520                 /* terminate rpc task */
 521                 task->tk_status = ret;
 522                 task->tk_action = NULL;
 523         }
 524 out:
 525         dprintk("<-- %s status=%d\n", __func__, ret);
 526         return ret;
 527 }
 528
 529 struct nfs41_call_sync_data {
 530         struct nfs_client *clp;
 531         struct nfs4_sequence_args *seq_args;
 532         struct nfs4_sequence_res *seq_res;
 533         int cache_reply;
 534 };
 535
 536 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 537 {
 538         struct nfs41_call_sync_data *data = calldata;
 539
 540         dprintk("--> %s data->clp->cl_session %p\n", __func__,
 541                 data->clp->cl_session);
 542         if (nfs4_setup_sequence(data->clp, data->seq_args,
 543                                 data->seq_res, data->cache_reply, task))
 544                 return;
 545         rpc_call_start(task);
 546 }
 547
 548 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 549 {
 550         struct nfs41_call_sync_data *data = calldata;
 551
 552         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
 553 }
 554
 555 struct rpc_call_ops nfs41_call_sync_ops = {
 556         .rpc_call_prepare = nfs41_call_sync_prepare,
 557         .rpc_call_done = nfs41_call_sync_done,
 558 };
 559
 560 static int nfs4_call_sync_sequence(struct nfs_client *clp,
 561                                    struct rpc_clnt *clnt,
 562                                    struct rpc_message *msg,
 563                                    struct nfs4_sequence_args *args,
 564                                    struct nfs4_sequence_res *res,
 565                                    int cache_reply)
 566 {
 567         int ret;
 568         struct rpc_task *task;
 569         struct nfs41_call_sync_data data = {
 570                 .clp = clp,
 571                 .seq_args = args,
 572                 .seq_res = res,
 573                 .cache_reply = cache_reply,
 574         };
 575         struct rpc_task_setup task_setup = {
 576                 .rpc_client = clnt,
 577                 .rpc_message = msg,
 578                 .callback_ops = &nfs41_call_sync_ops,
 579                 .callback_data = &data
 580         };
 581
 582         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 583         task = rpc_run_task(&task_setup);
 584         if (IS_ERR(task))
 585                 ret = PTR_ERR(task);
 586         else {
 587                 ret = task->tk_status;
 588                 rpc_put_task(task);
 589         }
 590         return ret;
 591 }
 592
 593 int _nfs4_call_sync_session(struct nfs_server *server,
 594                             struct rpc_message *msg,
 595                             struct nfs4_sequence_args *args,
 596                             struct nfs4_sequence_res *res,
 597                             int cache_reply)
 598 {
 599         return nfs4_call_sync_sequence(server->nfs_client, server->client,
 600                                        msg, args, res, cache_reply);
 601 }
 602
 603 #endif /* CONFIG_NFS_V4_1 */
 604
 605 int _nfs4_call_sync(struct nfs_server *server,
 606                     struct rpc_message *msg,
 607                     struct nfs4_sequence_args *args,
 608                     struct nfs4_sequence_res *res,
 609                     int cache_reply)
 610 {
 611         args->sa_session = res->sr_session = NULL;
 612         return rpc_call_sync(server->client, msg, 0);
 613 }
 614
 615 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 616         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 617                         &(res)->seq_res, (cache_reply))
 618
 619 static void nfs4_sequence_done(const struct nfs_server *server,
 620                                struct nfs4_sequence_res *res, int rpc_status)
 621 {
 622 #ifdef CONFIG_NFS_V4_1
 623         if (nfs4_has_session(server->nfs_client))
 624                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
 625 #endif /* CONFIG_NFS_V4_1 */
 626 }
 627
 628 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 629 {
 630         struct nfs_inode *nfsi = NFS_I(dir);
 631
 632         spin_lock(&dir->i_lock);
 633         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 634         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 635                 nfs_force_lookup_revalidate(dir);
 636         nfsi->change_attr = cinfo->after;
 637         spin_unlock(&dir->i_lock);
 638 }
 639
 640 struct nfs4_opendata {
 641         struct kref kref;
 642         struct nfs_openargs o_arg;
 643         struct nfs_openres o_res;
 644         struct nfs_open_confirmargs c_arg;
 645         struct nfs_open_confirmres c_res;
 646         struct nfs_fattr f_attr;
 647         struct nfs_fattr dir_attr;
 648         struct path path;
 649         struct dentry *dir;
 650         struct nfs4_state_owner *owner;
 651         struct nfs4_state *state;
 652         struct iattr attrs;
 653         unsigned long timestamp;
 654         unsigned int rpc_done : 1;
 655         int rpc_status;
 656         int cancelled;
 657 };
 658
 659
 660 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 661 {
 662         p->o_res.f_attr = &p->f_attr;
 663         p->o_res.dir_attr = &p->dir_attr;
 664         p->o_res.seqid = p->o_arg.seqid;
 665         p->c_res.seqid = p->c_arg.seqid;
 666         p->o_res.server = p->o_arg.server;
 667         nfs_fattr_init(&p->f_attr);
 668         nfs_fattr_init(&p->dir_attr);
 669         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 670 }
 671
 672 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 673                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 674                 const struct iattr *attrs)
 675 {
 676         struct dentry *parent = dget_parent(path->dentry);
 677         struct inode *dir = parent->d_inode;
 678         struct nfs_server *server = NFS_SERVER(dir);
 679         struct nfs4_opendata *p;
 680
 681         p = kzalloc(sizeof(*p), GFP_KERNEL);
 682         if (p == NULL)
 683                 goto err;
 684         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 685         if (p->o_arg.seqid == NULL)
 686                 goto err_free;
 687         p->path.mnt = mntget(path->mnt);
 688         p->path.dentry = dget(path->dentry);
 689         p->dir = parent;
 690         p->owner = sp;
 691         atomic_inc(&sp->so_count);
 692         p->o_arg.fh = NFS_FH(dir);
 693         p->o_arg.open_flags = flags;
 694         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 695         p->o_arg.clientid = server->nfs_client->cl_clientid;
 696         p->o_arg.id = sp->so_owner_id.id;
 697         p->o_arg.name = &p->path.dentry->d_name;
 698         p->o_arg.server = server;
 699         p->o_arg.bitmask = server->attr_bitmask;
 700         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 701         if (flags & O_EXCL) {
 702                 if (nfs4_has_persistent_session(server->nfs_client)) {
 703                         /* GUARDED */
 704                         p->o_arg.u.attrs = &p->attrs;
 705                         memcpy(&p->attrs, attrs, sizeof(p->attrs));
 706                 } else { /* EXCLUSIVE4_1 */
 707                         u32 *s = (u32 *) p->o_arg.u.verifier.data;
 708                         s[0] = jiffies;
 709                         s[1] = current->pid;
 710                 }
 711         } else if (flags & O_CREAT) {
 712                 p->o_arg.u.attrs = &p->attrs;
 713                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 714         }
 715         p->c_arg.fh = &p->o_res.fh;
 716         p->c_arg.stateid = &p->o_res.stateid;
 717         p->c_arg.seqid = p->o_arg.seqid;
 718         nfs4_init_opendata_res(p);
 719         kref_init(&p->kref);
 720         return p;
 721 err_free:
 722         kfree(p);
 723 err:
 724         dput(parent);
 725         return NULL;
 726 }
 727
 728 static void nfs4_opendata_free(struct kref *kref)
 729 {
 730         struct nfs4_opendata *p = container_of(kref,
 731                         struct nfs4_opendata, kref);
 732
 733         nfs_free_seqid(p->o_arg.seqid);
 734         if (p->state != NULL)
 735                 nfs4_put_open_state(p->state);
 736         nfs4_put_state_owner(p->owner);
 737         dput(p->dir);
 738         path_put(&p->path);
 739         kfree(p);
 740 }
 741
 742 static void nfs4_opendata_put(struct nfs4_opendata *p)
 743 {
 744         if (p != NULL)
 745                 kref_put(&p->kref, nfs4_opendata_free);
 746 }
 747
 748 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 749 {
 750         int ret;
 751
 752         ret = rpc_wait_for_completion_task(task);
 753         return ret;
 754 }
 755
 756 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 757 {
 758         int ret = 0;
 759
 760         if (open_mode & O_EXCL)
 761                 goto out;
 762         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 763                 case FMODE_READ:
 764                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 765                                 && state->n_rdonly != 0;
 766                         break;
 767                 case FMODE_WRITE:
 768                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 769                                 && state->n_wronly != 0;
 770                         break;
 771                 case FMODE_READ|FMODE_WRITE:
 772                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 773                                 && state->n_rdwr != 0;
 774         }
 775 out:
 776         return ret;
 777 }
 778
 779 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 780 {
 781         if ((delegation->type & fmode) != fmode)
 782                 return 0;
 783         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 784                 return 0;
 785         nfs_mark_delegation_referenced(delegation);
 786         return 1;
 787 }
 788
 789 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 790 {
 791         switch (fmode) {
 792                 case FMODE_WRITE:
 793                         state->n_wronly++;
 794                         break;
 795                 case FMODE_READ:
 796                         state->n_rdonly++;
 797                         break;
 798                 case FMODE_READ|FMODE_WRITE:
 799                         state->n_rdwr++;
 800         }
 801         nfs4_state_set_mode_locked(state, state->state | fmode);
 802 }
 803
 804 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 805 {
 806         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 807                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 808         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 809         switch (fmode) {
 810                 case FMODE_READ:
 811                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 812                         break;
 813                 case FMODE_WRITE:
 814                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 815                         break;
 816                 case FMODE_READ|FMODE_WRITE:
 817                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 818         }
 819 }
 820
 821 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 822 {
 823         write_seqlock(&state->seqlock);
 824         nfs_set_open_stateid_locked(state, stateid, fmode);
 825         write_sequnlock(&state->seqlock);
 826 }
 827
 828 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 829 {
 830         /*
 831          * Protect the call to nfs4_state_set_mode_locked and
 832          * serialise the stateid update
 833          */
 834         write_seqlock(&state->seqlock);
 835         if (deleg_stateid != NULL) {
 836                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 837                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 838         }
 839         if (open_stateid != NULL)
 840                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 841         write_sequnlock(&state->seqlock);
 842         spin_lock(&state->owner->so_lock);
 843         update_open_stateflags(state, fmode);
 844         spin_unlock(&state->owner->so_lock);
 845 }
 846
 847 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 848 {
 849         struct nfs_inode *nfsi = NFS_I(state->inode);
 850         struct nfs_delegation *deleg_cur;
 851         int ret = 0;
 852
 853         fmode &= (FMODE_READ|FMODE_WRITE);
 854
 855         rcu_read_lock();
 856         deleg_cur = rcu_dereference(nfsi->delegation);
 857         if (deleg_cur == NULL)
 858                 goto no_delegation;
 859
 860         spin_lock(&deleg_cur->lock);
 861         if (nfsi->delegation != deleg_cur ||
 862             (deleg_cur->type & fmode) != fmode)
 863                 goto no_delegation_unlock;
 864
 865         if (delegation == NULL)
 866                 delegation = &deleg_cur->stateid;
 867         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 868                 goto no_delegation_unlock;
 869
 870         nfs_mark_delegation_referenced(deleg_cur);
 871         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 872         ret = 1;
 873 no_delegation_unlock:
 874         spin_unlock(&deleg_cur->lock);
 875 no_delegation:
 876         rcu_read_unlock();
 877
 878         if (!ret && open_stateid != NULL) {
 879                 __update_open_stateid(state, open_stateid, NULL, fmode);
 880                 ret = 1;
 881         }
 882
 883         return ret;
 884 }
 885
 886
 887 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 888 {
 889         struct nfs_delegation *delegation;
 890
 891         rcu_read_lock();
 892         delegation = rcu_dereference(NFS_I(inode)->delegation);
 893         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 894                 rcu_read_unlock();
 895                 return;
 896         }
 897         rcu_read_unlock();
 898         nfs_inode_return_delegation(inode);
 899 }
 900
 901 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 902 {
 903         struct nfs4_state *state = opendata->state;
 904         struct nfs_inode *nfsi = NFS_I(state->inode);
 905         struct nfs_delegation *delegation;
 906         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 907         fmode_t fmode = opendata->o_arg.fmode;
 908         nfs4_stateid stateid;
 909         int ret = -EAGAIN;
 910
 911         for (;;) {
 912                 if (can_open_cached(state, fmode, open_mode)) {
 913                         spin_lock(&state->owner->so_lock);
 914                         if (can_open_cached(state, fmode, open_mode)) {
 915                                 update_open_stateflags(state, fmode);
 916                                 spin_unlock(&state->owner->so_lock);
 917                                 goto out_return_state;
 918                         }
 919                         spin_unlock(&state->owner->so_lock);
 920                 }
 921                 rcu_read_lock();
 922                 delegation = rcu_dereference(nfsi->delegation);
 923                 if (delegation == NULL ||
 924                     !can_open_delegated(delegation, fmode)) {
 925                         rcu_read_unlock();
 926                         break;
 927                 }
 928                 /* Save the delegation */
 929                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 930                 rcu_read_unlock();
 931                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 932                 if (ret != 0)
 933                         goto out;
 934                 ret = -EAGAIN;
 935
 936                 /* Try to update the stateid using the delegation */
 937                 if (update_open_stateid(state, NULL, &stateid, fmode))
 938                         goto out_return_state;
 939         }
 940 out:
 941         return ERR_PTR(ret);
 942 out_return_state:
 943         atomic_inc(&state->count);
 944         return state;
 945 }
 946
 947 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 948 {
 949         struct inode *inode;
 950         struct nfs4_state *state = NULL;
 951         struct nfs_delegation *delegation;
 952         int ret;
 953
 954         if (!data->rpc_done) {
 955                 state = nfs4_try_open_cached(data);
 956                 goto out;
 957         }
 958
 959         ret = -EAGAIN;
 960         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 961                 goto err;
 962         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 963         ret = PTR_ERR(inode);
 964         if (IS_ERR(inode))
 965                 goto err;
 966         ret = -ENOMEM;
 967         state = nfs4_get_open_state(inode, data->owner);
 968         if (state == NULL)
 969                 goto err_put_inode;
 970         if (data->o_res.delegation_type != 0) {
 971                 int delegation_flags = 0;
 972
 973                 rcu_read_lock();
 974                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 975                 if (delegation)
 976                         delegation_flags = delegation->flags;
 977                 rcu_read_unlock();
 978                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 979                         nfs_inode_set_delegation(state->inode,
 980                                         data->owner->so_cred,
 981                                         &data->o_res);
 982                 else
 983                         nfs_inode_reclaim_delegation(state->inode,
 984                                         data->owner->so_cred,
 985                                         &data->o_res);
 986         }
 987
 988         update_open_stateid(state, &data->o_res.stateid, NULL,
 989                         data->o_arg.fmode);
 990         iput(inode);
 991 out:
 992         return state;
 993 err_put_inode:
 994         iput(inode);
 995 err:
 996         return ERR_PTR(ret);
 997 }
 998
 999 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1000 {
1001         struct nfs_inode *nfsi = NFS_I(state->inode);
1002         struct nfs_open_context *ctx;
1003
1004         spin_lock(&state->inode->i_lock);
1005         list_for_each_entry(ctx, &nfsi->open_files, list) {
1006                 if (ctx->state != state)
1007                         continue;
1008                 get_nfs_open_context(ctx);
1009                 spin_unlock(&state->inode->i_lock);
1010                 return ctx;
1011         }
1012         spin_unlock(&state->inode->i_lock);
1013         return ERR_PTR(-ENOENT);
1014 }
1015
1016 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1017 {
1018         struct nfs4_opendata *opendata;
1019
1020         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1021         if (opendata == NULL)
1022                 return ERR_PTR(-ENOMEM);
1023         opendata->state = state;
1024         atomic_inc(&state->count);
1025         return opendata;
1026 }
1027
1028 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1029 {
1030         struct nfs4_state *newstate;
1031         int ret;
1032
1033         opendata->o_arg.open_flags = 0;
1034         opendata->o_arg.fmode = fmode;
1035         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1036         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1037         nfs4_init_opendata_res(opendata);
1038         ret = _nfs4_proc_open(opendata);
1039         if (ret != 0)
1040                 return ret;
1041         newstate = nfs4_opendata_to_nfs4_state(opendata);
1042         if (IS_ERR(newstate))
1043                 return PTR_ERR(newstate);
1044         nfs4_close_state(&opendata->path, newstate, fmode);
1045         *res = newstate;
1046         return 0;
1047 }
1048
1049 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1050 {
1051         struct nfs4_state *newstate;
1052         int ret;
1053
1054         /* memory barrier prior to reading state->n_* */
1055         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1056         smp_rmb();
1057         if (state->n_rdwr != 0) {
1058                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1059                 if (ret != 0)
1060                         return ret;
1061                 if (newstate != state)
1062                         return -ESTALE;
1063         }
1064         if (state->n_wronly != 0) {
1065                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1066                 if (ret != 0)
1067                         return ret;
1068                 if (newstate != state)
1069                         return -ESTALE;
1070         }
1071         if (state->n_rdonly != 0) {
1072                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1073                 if (ret != 0)
1074                         return ret;
1075                 if (newstate != state)
1076                         return -ESTALE;
1077         }
1078         /*
1079          * We may have performed cached opens for all three recoveries.
1080          * Check if we need to update the current stateid.
1081          */
1082         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1083             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1084                 write_seqlock(&state->seqlock);
1085                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1086                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1087                 write_sequnlock(&state->seqlock);
1088         }
1089         return 0;
1090 }
1091
1092 /*
1093  * OPEN_RECLAIM:
1094  *      reclaim state on the server after a reboot.
1095  */
1096 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1097 {
1098         struct nfs_delegation *delegation;
1099         struct nfs4_opendata *opendata;
1100         fmode_t delegation_type = 0;
1101         int status;
1102
1103         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1104         if (IS_ERR(opendata))
1105                 return PTR_ERR(opendata);
1106         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1107         opendata->o_arg.fh = NFS_FH(state->inode);
1108         rcu_read_lock();
1109         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1110         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1111                 delegation_type = delegation->type;
1112         rcu_read_unlock();
1113         opendata->o_arg.u.delegation_type = delegation_type;
1114         status = nfs4_open_recover(opendata, state);
1115         nfs4_opendata_put(opendata);
1116         return status;
1117 }
1118
1119 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1120 {
1121         struct nfs_server *server = NFS_SERVER(state->inode);
1122         struct nfs4_exception exception = { };
1123         int err;
1124         do {
1125                 err = _nfs4_do_open_reclaim(ctx, state);
1126                 if (err != -NFS4ERR_DELAY)
1127                         break;
1128                 nfs4_handle_exception(server, err, &exception);
1129         } while (exception.retry);
1130         return err;
1131 }
1132
1133 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1134 {
1135         struct nfs_open_context *ctx;
1136         int ret;
1137
1138         ctx = nfs4_state_find_open_context(state);
1139         if (IS_ERR(ctx))
1140                 return PTR_ERR(ctx);
1141         ret = nfs4_do_open_reclaim(ctx, state);
1142         put_nfs_open_context(ctx);
1143         return ret;
1144 }
1145
1146 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1147 {
1148         struct nfs4_opendata *opendata;
1149         int ret;
1150
1151         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1152         if (IS_ERR(opendata))
1153                 return PTR_ERR(opendata);
1154         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1155         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1156                         sizeof(opendata->o_arg.u.delegation.data));
1157         ret = nfs4_open_recover(opendata, state);
1158         nfs4_opendata_put(opendata);
1159         return ret;
1160 }
1161
1162 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1163 {
1164         struct nfs4_exception exception = { };
1165         struct nfs_server *server = NFS_SERVER(state->inode);
1166         int err;
1167         do {
1168                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1169                 switch (err) {
1170                         case 0:
1171                         case -ENOENT:
1172                         case -ESTALE:
1173                                 goto out;
1174                         case -NFS4ERR_BADSESSION:
1175                         case -NFS4ERR_BADSLOT:
1176                         case -NFS4ERR_BAD_HIGH_SLOT:
1177                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1178                         case -NFS4ERR_DEADSESSION:
1179                                 nfs4_schedule_state_recovery(
1180                                         server->nfs_client);
1181                                 goto out;
1182                         case -NFS4ERR_STALE_CLIENTID:
1183                         case -NFS4ERR_STALE_STATEID:
1184                         case -NFS4ERR_EXPIRED:
1185                                 /* Don't recall a delegation if it was lost */
1186                                 nfs4_schedule_state_recovery(server->nfs_client);
1187                                 goto out;
1188                         case -ERESTARTSYS:
1189                                 /*
1190                                  * The show must go on: exit, but mark the
1191                                  * stateid as needing recovery.
1192                                  */
1193                         case -NFS4ERR_ADMIN_REVOKED:
1194                         case -NFS4ERR_BAD_STATEID:
1195                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1196                         case -ENOMEM:
1197                                 err = 0;
1198                                 goto out;
1199                 }
1200                 err = nfs4_handle_exception(server, err, &exception);
1201         } while (exception.retry);
1202 out:
1203         return err;
1204 }
1205
1206 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1207 {
1208         struct nfs4_opendata *data = calldata;
1209
1210         data->rpc_status = task->tk_status;
1211         if (RPC_ASSASSINATED(task))
1212                 return;
1213         if (data->rpc_status == 0) {
1214                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1215                                 sizeof(data->o_res.stateid.data));
1216                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1217                 renew_lease(data->o_res.server, data->timestamp);
1218                 data->rpc_done = 1;
1219         }
1220 }
1221
1222 static void nfs4_open_confirm_release(void *calldata)
1223 {
1224         struct nfs4_opendata *data = calldata;
1225         struct nfs4_state *state = NULL;
1226
1227         /* If this request hasn't been cancelled, do nothing */
1228         if (data->cancelled == 0)
1229                 goto out_free;
1230         /* In case of error, no cleanup! */
1231         if (!data->rpc_done)
1232                 goto out_free;
1233         state = nfs4_opendata_to_nfs4_state(data);
1234         if (!IS_ERR(state))
1235                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1236 out_free:
1237         nfs4_opendata_put(data);
1238 }
1239
1240 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1241         .rpc_call_done = nfs4_open_confirm_done,
1242         .rpc_release = nfs4_open_confirm_release,
1243 };
1244
1245 /*
1246  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1247  */
1248 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1249 {
1250         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1251         struct rpc_task *task;
1252         struct  rpc_message msg = {
1253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1254                 .rpc_argp = &data->c_arg,
1255                 .rpc_resp = &data->c_res,
1256                 .rpc_cred = data->owner->so_cred,
1257         };
1258         struct rpc_task_setup task_setup_data = {
1259                 .rpc_client = server->client,
1260                 .rpc_message = &msg,
1261                 .callback_ops = &nfs4_open_confirm_ops,
1262                 .callback_data = data,
1263                 .workqueue = nfsiod_workqueue,
1264                 .flags = RPC_TASK_ASYNC,
1265         };
1266         int status;
1267
1268         kref_get(&data->kref);
1269         data->rpc_done = 0;
1270         data->rpc_status = 0;
1271         data->timestamp = jiffies;
1272         task = rpc_run_task(&task_setup_data);
1273         if (IS_ERR(task))
1274                 return PTR_ERR(task);
1275         status = nfs4_wait_for_completion_rpc_task(task);
1276         if (status != 0) {
1277                 data->cancelled = 1;
1278                 smp_wmb();
1279         } else
1280                 status = data->rpc_status;
1281         rpc_put_task(task);
1282         return status;
1283 }
1284
1285 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1286 {
1287         struct nfs4_opendata *data = calldata;
1288         struct nfs4_state_owner *sp = data->owner;
1289
1290         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1291                 return;
1292         /*
1293          * Check if we still need to send an OPEN call, or if we can use
1294          * a delegation instead.
1295          */
1296         if (data->state != NULL) {
1297                 struct nfs_delegation *delegation;
1298
1299                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1300                         goto out_no_action;
1301                 rcu_read_lock();
1302                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1303                 if (delegation != NULL &&
1304                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1305                         rcu_read_unlock();
1306                         goto out_no_action;
1307                 }
1308                 rcu_read_unlock();
1309         }
1310         /* Update sequence id. */
1311         data->o_arg.id = sp->so_owner_id.id;
1312         data->o_arg.clientid = sp->so_client->cl_clientid;
1313         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1314                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1315                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1316         }
1317         data->timestamp = jiffies;
1318         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1319                                 &data->o_arg.seq_args,
1320                                 &data->o_res.seq_res, 1, task))
1321                 return;
1322         rpc_call_start(task);
1323         return;
1324 out_no_action:
1325         task->tk_action = NULL;
1326
1327 }
1328
1329 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1330 {
1331         struct nfs4_opendata *data = calldata;
1332
1333         data->rpc_status = task->tk_status;
1334
1335         nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
1336                         task->tk_status);
1337
1338         if (RPC_ASSASSINATED(task))
1339                 return;
1340         if (task->tk_status == 0) {
1341                 switch (data->o_res.f_attr->mode & S_IFMT) {
1342                         case S_IFREG:
1343                                 break;
1344                         case S_IFLNK:
1345                                 data->rpc_status = -ELOOP;
1346                                 break;
1347                         case S_IFDIR:
1348                                 data->rpc_status = -EISDIR;
1349                                 break;
1350                         default:
1351                                 data->rpc_status = -ENOTDIR;
1352                 }
1353                 renew_lease(data->o_res.server, data->timestamp);
1354                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1355                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1356         }
1357         data->rpc_done = 1;
1358 }
1359
1360 static void nfs4_open_release(void *calldata)
1361 {
1362         struct nfs4_opendata *data = calldata;
1363         struct nfs4_state *state = NULL;
1364
1365         /* If this request hasn't been cancelled, do nothing */
1366         if (data->cancelled == 0)
1367                 goto out_free;
1368         /* In case of error, no cleanup! */
1369         if (data->rpc_status != 0 || !data->rpc_done)
1370                 goto out_free;
1371         /* In case we need an open_confirm, no cleanup! */
1372         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1373                 goto out_free;
1374         state = nfs4_opendata_to_nfs4_state(data);
1375         if (!IS_ERR(state))
1376                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1377 out_free:
1378         nfs4_opendata_put(data);
1379 }
1380
1381 static const struct rpc_call_ops nfs4_open_ops = {
1382         .rpc_call_prepare = nfs4_open_prepare,
1383         .rpc_call_done = nfs4_open_done,
1384         .rpc_release = nfs4_open_release,
1385 };
1386
1387 /*
1388  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1389  */
1390 static int _nfs4_proc_open(struct nfs4_opendata *data)
1391 {
1392         struct inode *dir = data->dir->d_inode;
1393         struct nfs_server *server = NFS_SERVER(dir);
1394         struct nfs_openargs *o_arg = &data->o_arg;
1395         struct nfs_openres *o_res = &data->o_res;
1396         struct rpc_task *task;
1397         struct rpc_message msg = {
1398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1399                 .rpc_argp = o_arg,
1400                 .rpc_resp = o_res,
1401                 .rpc_cred = data->owner->so_cred,
1402         };
1403         struct rpc_task_setup task_setup_data = {
1404                 .rpc_client = server->client,
1405                 .rpc_message = &msg,
1406                 .callback_ops = &nfs4_open_ops,
1407                 .callback_data = data,
1408                 .workqueue = nfsiod_workqueue,
1409                 .flags = RPC_TASK_ASYNC,
1410         };
1411         int status;
1412
1413         kref_get(&data->kref);
1414         data->rpc_done = 0;
1415         data->rpc_status = 0;
1416         data->cancelled = 0;
1417         task = rpc_run_task(&task_setup_data);
1418         if (IS_ERR(task))
1419                 return PTR_ERR(task);
1420         status = nfs4_wait_for_completion_rpc_task(task);
1421         if (status != 0) {
1422                 data->cancelled = 1;
1423                 smp_wmb();
1424         } else
1425                 status = data->rpc_status;
1426         rpc_put_task(task);
1427         if (status != 0 || !data->rpc_done)
1428                 return status;
1429
1430         if (o_res->fh.size == 0)
1431                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1432
1433         if (o_arg->open_flags & O_CREAT) {
1434                 update_changeattr(dir, &o_res->cinfo);
1435                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1436         } else
1437                 nfs_refresh_inode(dir, o_res->dir_attr);
1438         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1439                 status = _nfs4_proc_open_confirm(data);
1440                 if (status != 0)
1441                         return status;
1442         }
1443         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1444                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1445         return 0;
1446 }
1447
1448 static int nfs4_recover_expired_lease(struct nfs_server *server)
1449 {
1450         struct nfs_client *clp = server->nfs_client;
1451         unsigned int loop;
1452         int ret;
1453
1454         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1455                 ret = nfs4_wait_clnt_recover(clp);
1456                 if (ret != 0)
1457                         break;
1458                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1459                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1460                         break;
1461                 nfs4_schedule_state_recovery(clp);
1462                 ret = -EIO;
1463         }
1464         return ret;
1465 }
1466
1467 /*
1468  * OPEN_EXPIRED:
1469  *      reclaim state on the server after a network partition.
1470  *      Assumes caller holds the appropriate lock
1471  */
1472 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1473 {
1474         struct nfs4_opendata *opendata;
1475         int ret;
1476
1477         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1478         if (IS_ERR(opendata))
1479                 return PTR_ERR(opendata);
1480         ret = nfs4_open_recover(opendata, state);
1481         if (ret == -ESTALE)
1482                 d_drop(ctx->path.dentry);
1483         nfs4_opendata_put(opendata);
1484         return ret;
1485 }
1486
1487 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1488 {
1489         struct nfs_server *server = NFS_SERVER(state->inode);
1490         struct nfs4_exception exception = { };
1491         int err;
1492
1493         do {
1494                 err = _nfs4_open_expired(ctx, state);
1495                 switch (err) {
1496                 default:
1497                         goto out;
1498                 case -NFS4ERR_GRACE:
1499                 case -NFS4ERR_DELAY:
1500                         nfs4_handle_exception(server, err, &exception);
1501                         err = 0;
1502                 }
1503         } while (exception.retry);
1504 out:
1505         return err;
1506 }
1507
1508 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1509 {
1510         struct nfs_open_context *ctx;
1511         int ret;
1512
1513         ctx = nfs4_state_find_open_context(state);
1514         if (IS_ERR(ctx))
1515                 return PTR_ERR(ctx);
1516         ret = nfs4_do_open_expired(ctx, state);
1517         put_nfs_open_context(ctx);
1518         return ret;
1519 }
1520
1521 /*
1522  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1523  * fields corresponding to attributes that were used to store the verifier.
1524  * Make sure we clobber those fields in the later setattr call
1525  */
1526 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1527 {
1528         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1529             !(sattr->ia_valid & ATTR_ATIME_SET))
1530                 sattr->ia_valid |= ATTR_ATIME;
1531
1532         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1533             !(sattr->ia_valid & ATTR_MTIME_SET))
1534                 sattr->ia_valid |= ATTR_MTIME;
1535 }
1536
1537 /*
1538  * Returns a referenced nfs4_state
1539  */
1540 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)
1541 {
1542         struct nfs4_state_owner  *sp;
1543         struct nfs4_state     *state = NULL;
1544         struct nfs_server       *server = NFS_SERVER(dir);
1545         struct nfs4_opendata *opendata;
1546         int status;
1547
1548         /* Protect against reboot recovery conflicts */
1549         status = -ENOMEM;
1550         if (!(sp = nfs4_get_state_owner(server, cred))) {
1551                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1552                 goto out_err;
1553         }
1554         status = nfs4_recover_expired_lease(server);
1555         if (status != 0)
1556                 goto err_put_state_owner;
1557         if (path->dentry->d_inode != NULL)
1558                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1559         status = -ENOMEM;
1560         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1561         if (opendata == NULL)
1562                 goto err_put_state_owner;
1563
1564         if (path->dentry->d_inode != NULL)
1565                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1566
1567         status = _nfs4_proc_open(opendata);
1568         if (status != 0)
1569                 goto err_opendata_put;
1570
1571         if (opendata->o_arg.open_flags & O_EXCL)
1572                 nfs4_exclusive_attrset(opendata, sattr);
1573
1574         state = nfs4_opendata_to_nfs4_state(opendata);
1575         status = PTR_ERR(state);
1576         if (IS_ERR(state))
1577                 goto err_opendata_put;
1578         nfs4_opendata_put(opendata);
1579         nfs4_put_state_owner(sp);
1580         *res = state;
1581         return 0;
1582 err_opendata_put:
1583         nfs4_opendata_put(opendata);
1584 err_put_state_owner:
1585         nfs4_put_state_owner(sp);
1586 out_err:
1587         *res = NULL;
1588         return status;
1589 }
1590
1591
1592 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)
1593 {
1594         struct nfs4_exception exception = { };
1595         struct nfs4_state *res;
1596         int status;
1597
1598         do {
1599                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1600                 if (status == 0)
1601                         break;
1602                 /* NOTE: BAD_SEQID means the server and client disagree about the
1603                  * book-keeping w.r.t. state-changing operations
1604                  * (OPEN/CLOSE/LOCK/LOCKU...)
1605                  * It is actually a sign of a bug on the client or on the server.
1606                  *
1607                  * If we receive a BAD_SEQID error in the particular case of
1608                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1609                  * have unhashed the old state_owner for us, and that we can
1610                  * therefore safely retry using a new one. We should still warn
1611                  * the user though...
1612                  */
1613                 if (status == -NFS4ERR_BAD_SEQID) {
1614                         printk(KERN_WARNING "NFS: v4 server %s "
1615                                         " returned a bad sequence-id error!\n",
1616                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1617                         exception.retry = 1;
1618                         continue;
1619                 }
1620                 /*
1621                  * BAD_STATEID on OPEN means that the server cancelled our
1622                  * state before it received the OPEN_CONFIRM.
1623                  * Recover by retrying the request as per the discussion
1624                  * on Page 181 of RFC3530.
1625                  */
1626                 if (status == -NFS4ERR_BAD_STATEID) {
1627                         exception.retry = 1;
1628                         continue;
1629                 }
1630                 if (status == -EAGAIN) {
1631                         /* We must have found a delegation */
1632                         exception.retry = 1;
1633                         continue;
1634                 }
1635                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1636                                         status, &exception));
1637         } while (exception.retry);
1638         return res;
1639 }
1640
1641 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1642                             struct nfs_fattr *fattr, struct iattr *sattr,
1643                             struct nfs4_state *state)
1644 {
1645         struct nfs_server *server = NFS_SERVER(inode);
1646         struct nfs_setattrargs  arg = {
1647                 .fh             = NFS_FH(inode),
1648                 .iap            = sattr,
1649                 .server         = server,
1650                 .bitmask = server->attr_bitmask,
1651         };
1652         struct nfs_setattrres  res = {
1653                 .fattr          = fattr,
1654                 .server         = server,
1655         };
1656         struct rpc_message msg = {
1657                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1658                 .rpc_argp       = &arg,
1659                 .rpc_resp       = &res,
1660                 .rpc_cred       = cred,
1661         };
1662         unsigned long timestamp = jiffies;
1663         int status;
1664
1665         nfs_fattr_init(fattr);
1666
1667         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1668                 /* Use that stateid */
1669         } else if (state != NULL) {
1670                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1671         } else
1672                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1673
1674         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1675         if (status == 0 && state != NULL)
1676                 renew_lease(server, timestamp);
1677         return status;
1678 }
1679
1680 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1681                            struct nfs_fattr *fattr, struct iattr *sattr,
1682                            struct nfs4_state *state)
1683 {
1684         struct nfs_server *server = NFS_SERVER(inode);
1685         struct nfs4_exception exception = { };
1686         int err;
1687         do {
1688                 err = nfs4_handle_exception(server,
1689                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1690                                 &exception);
1691         } while (exception.retry);
1692         return err;
1693 }
1694
1695 struct nfs4_closedata {
1696         struct path path;
1697         struct inode *inode;
1698         struct nfs4_state *state;
1699         struct nfs_closeargs arg;
1700         struct nfs_closeres res;
1701         struct nfs_fattr fattr;
1702         unsigned long timestamp;
1703 };
1704
1705 static void nfs4_free_closedata(void *data)
1706 {
1707         struct nfs4_closedata *calldata = data;
1708         struct nfs4_state_owner *sp = calldata->state->owner;
1709
1710         nfs4_put_open_state(calldata->state);
1711         nfs_free_seqid(calldata->arg.seqid);
1712         nfs4_put_state_owner(sp);
1713         path_put(&calldata->path);
1714         kfree(calldata);
1715 }
1716
1717 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1718                 fmode_t fmode)
1719 {
1720         spin_lock(&state->owner->so_lock);
1721         if (!(fmode & FMODE_READ))
1722                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1723         if (!(fmode & FMODE_WRITE))
1724                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1725         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1726         spin_unlock(&state->owner->so_lock);
1727 }
1728
1729 static void nfs4_close_done(struct rpc_task *task, void *data)
1730 {
1731         struct nfs4_closedata *calldata = data;
1732         struct nfs4_state *state = calldata->state;
1733         struct nfs_server *server = NFS_SERVER(calldata->inode);
1734
1735         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1736         if (RPC_ASSASSINATED(task))
1737                 return;
1738         /* hmm. we are done with the inode, and in the process of freeing
1739          * the state_owner. we keep this around to process errors
1740          */
1741         switch (task->tk_status) {
1742                 case 0:
1743                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1744                         renew_lease(server, calldata->timestamp);
1745                         nfs4_close_clear_stateid_flags(state,
1746                                         calldata->arg.fmode);
1747                         break;
1748                 case -NFS4ERR_STALE_STATEID:
1749                 case -NFS4ERR_OLD_STATEID:
1750                 case -NFS4ERR_BAD_STATEID:
1751                 case -NFS4ERR_EXPIRED:
1752                         if (calldata->arg.fmode == 0)
1753                                 break;
1754                 default:
1755                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1756                                 nfs_restart_rpc(task, server->nfs_client);
1757                                 return;
1758                         }
1759         }
1760         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1761 }
1762
1763 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1764 {
1765         struct nfs4_closedata *calldata = data;
1766         struct nfs4_state *state = calldata->state;
1767         int call_close = 0;
1768
1769         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1770                 return;
1771
1772         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1773         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1774         spin_lock(&state->owner->so_lock);
1775         /* Calculate the change in open mode */
1776         if (state->n_rdwr == 0) {
1777                 if (state->n_rdonly == 0) {
1778                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1779                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1780                         calldata->arg.fmode &= ~FMODE_READ;
1781                 }
1782                 if (state->n_wronly == 0) {
1783                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1784                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1785                         calldata->arg.fmode &= ~FMODE_WRITE;
1786                 }
1787         }
1788         spin_unlock(&state->owner->so_lock);
1789
1790         if (!call_close) {
1791                 /* Note: exit _without_ calling nfs4_close_done */
1792                 task->tk_action = NULL;
1793                 return;
1794         }
1795
1796         if (calldata->arg.fmode == 0)
1797                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1798
1799         nfs_fattr_init(calldata->res.fattr);
1800         calldata->timestamp = jiffies;
1801         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1802                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1803                                 1, task))
1804                 return;
1805         rpc_call_start(task);
1806 }
1807
1808 static const struct rpc_call_ops nfs4_close_ops = {
1809         .rpc_call_prepare = nfs4_close_prepare,
1810         .rpc_call_done = nfs4_close_done,
1811         .rpc_release = nfs4_free_closedata,
1812 };
1813
1814 /*
1815  * It is possible for data to be read/written from a mem-mapped file
1816  * after the sys_close call (which hits the vfs layer as a flush).
1817  * This means that we can't safely call nfsv4 close on a file until
1818  * the inode is cleared. This in turn means that we are not good
1819  * NFSv4 citizens - we do not indicate to the server to update the file's
1820  * share state even when we are done with one of the three share
1821  * stateid's in the inode.
1822  *
1823  * NOTE: Caller must be holding the sp->so_owner semaphore!
1824  */
1825 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1826 {
1827         struct nfs_server *server = NFS_SERVER(state->inode);
1828         struct nfs4_closedata *calldata;
1829         struct nfs4_state_owner *sp = state->owner;
1830         struct rpc_task *task;
1831         struct rpc_message msg = {
1832                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1833                 .rpc_cred = state->owner->so_cred,
1834         };
1835         struct rpc_task_setup task_setup_data = {
1836                 .rpc_client = server->client,
1837                 .rpc_message = &msg,
1838                 .callback_ops = &nfs4_close_ops,
1839                 .workqueue = nfsiod_workqueue,
1840                 .flags = RPC_TASK_ASYNC,
1841         };
1842         int status = -ENOMEM;
1843
1844         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1845         if (calldata == NULL)
1846                 goto out;
1847         calldata->inode = state->inode;
1848         calldata->state = state;
1849         calldata->arg.fh = NFS_FH(state->inode);
1850         calldata->arg.stateid = &state->open_stateid;
1851         if (nfs4_has_session(server->nfs_client))
1852                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1853         /* Serialization for the sequence id */
1854         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1855         if (calldata->arg.seqid == NULL)
1856                 goto out_free_calldata;
1857         calldata->arg.fmode = 0;
1858         calldata->arg.bitmask = server->cache_consistency_bitmask;
1859         calldata->res.fattr = &calldata->fattr;
1860         calldata->res.seqid = calldata->arg.seqid;
1861         calldata->res.server = server;
1862         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1863         calldata->path.mnt = mntget(path->mnt);
1864         calldata->path.dentry = dget(path->dentry);
1865
1866         msg.rpc_argp = &calldata->arg,
1867         msg.rpc_resp = &calldata->res,
1868         task_setup_data.callback_data = calldata;
1869         task = rpc_run_task(&task_setup_data);
1870         if (IS_ERR(task))
1871                 return PTR_ERR(task);
1872         status = 0;
1873         if (wait)
1874                 status = rpc_wait_for_completion_task(task);
1875         rpc_put_task(task);
1876         return status;
1877 out_free_calldata:
1878         kfree(calldata);
1879 out:
1880         nfs4_put_open_state(state);
1881         nfs4_put_state_owner(sp);
1882         return status;
1883 }
1884
1885 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1886 {
1887         struct file *filp;
1888         int ret;
1889
1890         /* If the open_intent is for execute, we have an extra check to make */
1891         if (fmode & FMODE_EXEC) {
1892                 ret = nfs_may_open(state->inode,
1893                                 state->owner->so_cred,
1894                                 nd->intent.open.flags);
1895                 if (ret < 0)
1896                         goto out_close;
1897         }
1898         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1899         if (!IS_ERR(filp)) {
1900                 struct nfs_open_context *ctx;
1901                 ctx = nfs_file_open_context(filp);
1902                 ctx->state = state;
1903                 return 0;
1904         }
1905         ret = PTR_ERR(filp);
1906 out_close:
1907         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1908         return ret;
1909 }
1910
1911 struct dentry *
1912 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1913 {
1914         struct path path = {
1915                 .mnt = nd->path.mnt,
1916                 .dentry = dentry,
1917         };
1918         struct dentry *parent;
1919         struct iattr attr;
1920         struct rpc_cred *cred;
1921         struct nfs4_state *state;
1922         struct dentry *res;
1923         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1924
1925         if (nd->flags & LOOKUP_CREATE) {
1926                 attr.ia_mode = nd->intent.open.create_mode;
1927                 attr.ia_valid = ATTR_MODE;
1928                 if (!IS_POSIXACL(dir))
1929                         attr.ia_mode &= ~current_umask();
1930         } else {
1931                 attr.ia_valid = 0;
1932                 BUG_ON(nd->intent.open.flags & O_CREAT);
1933         }
1934
1935         cred = rpc_lookup_cred();
1936         if (IS_ERR(cred))
1937                 return (struct dentry *)cred;
1938         parent = dentry->d_parent;
1939         /* Protect against concurrent sillydeletes */
1940         nfs_block_sillyrename(parent);
1941         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1942         put_rpccred(cred);
1943         if (IS_ERR(state)) {
1944                 if (PTR_ERR(state) == -ENOENT) {
1945                         d_add(dentry, NULL);
1946                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1947                 }
1948                 nfs_unblock_sillyrename(parent);
1949                 return (struct dentry *)state;
1950         }
1951         res = d_add_unique(dentry, igrab(state->inode));
1952         if (res != NULL)
1953                 path.dentry = res;
1954         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1955         nfs_unblock_sillyrename(parent);
1956         nfs4_intent_set_file(nd, &path, state, fmode);
1957         return res;
1958 }
1959
1960 int
1961 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1962 {
1963         struct path path = {
1964                 .mnt = nd->path.mnt,
1965                 .dentry = dentry,
1966         };
1967         struct rpc_cred *cred;
1968         struct nfs4_state *state;
1969         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1970
1971         cred = rpc_lookup_cred();
1972         if (IS_ERR(cred))
1973                 return PTR_ERR(cred);
1974         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1975         put_rpccred(cred);
1976         if (IS_ERR(state)) {
1977                 switch (PTR_ERR(state)) {
1978                         case -EPERM:
1979                         case -EACCES:
1980                         case -EDQUOT:
1981                         case -ENOSPC:
1982                         case -EROFS:
1983                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1984                                 return 1;
1985                         default:
1986                                 goto out_drop;
1987                 }
1988         }
1989         if (state->inode == dentry->d_inode) {
1990                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1991                 nfs4_intent_set_file(nd, &path, state, fmode);
1992                 return 1;
1993         }
1994         nfs4_close_sync(&path, state, fmode);
1995 out_drop:
1996         d_drop(dentry);
1997         return 0;
1998 }
1999
2000 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2001 {
2002         if (ctx->state == NULL)
2003                 return;
2004         if (is_sync)
2005                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2006         else
2007                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2008 }
2009
2010 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2011 {
2012         struct nfs4_server_caps_arg args = {
2013                 .fhandle = fhandle,
2014         };
2015         struct nfs4_server_caps_res res = {};
2016         struct rpc_message msg = {
2017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2018                 .rpc_argp = &args,
2019                 .rpc_resp = &res,
2020         };
2021         int status;
2022
2023         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2024         if (status == 0) {
2025                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2026                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2027                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2028                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2029                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2030                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2031                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2032                         server->caps |= NFS_CAP_ACLS;
2033                 if (res.has_links != 0)
2034                         server->caps |= NFS_CAP_HARDLINKS;
2035                 if (res.has_symlinks != 0)
2036                         server->caps |= NFS_CAP_SYMLINKS;
2037                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2038                         server->caps |= NFS_CAP_FILEID;
2039                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2040                         server->caps |= NFS_CAP_MODE;
2041                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2042                         server->caps |= NFS_CAP_NLINK;
2043                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2044                         server->caps |= NFS_CAP_OWNER;
2045                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2046                         server->caps |= NFS_CAP_OWNER_GROUP;
2047                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2048                         server->caps |= NFS_CAP_ATIME;
2049                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2050                         server->caps |= NFS_CAP_CTIME;
2051                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2052                         server->caps |= NFS_CAP_MTIME;
2053
2054                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2055                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2056                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2057                 server->acl_bitmask = res.acl_bitmask;
2058         }
2059
2060         return status;
2061 }
2062
2063 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2064 {
2065         struct nfs4_exception exception = { };
2066         int err;
2067         do {
2068                 err = nfs4_handle_exception(server,
2069                                 _nfs4_server_capabilities(server, fhandle),
2070                                 &exception);
2071         } while (exception.retry);
2072         return err;
2073 }
2074
2075 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2076                 struct nfs_fsinfo *info)
2077 {
2078         struct nfs4_lookup_root_arg args = {
2079                 .bitmask = nfs4_fattr_bitmap,
2080         };
2081         struct nfs4_lookup_res res = {
2082                 .server = server,
2083                 .fattr = info->fattr,
2084                 .fh = fhandle,
2085         };
2086         struct rpc_message msg = {
2087                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2088                 .rpc_argp = &args,
2089                 .rpc_resp = &res,
2090         };
2091
2092         nfs_fattr_init(info->fattr);
2093         return nfs4_call_sync(server, &msg, &args, &res, 0);
2094 }
2095
2096 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2097                 struct nfs_fsinfo *info)
2098 {
2099         struct nfs4_exception exception = { };
2100         int err;
2101         do {
2102                 err = nfs4_handle_exception(server,
2103                                 _nfs4_lookup_root(server, fhandle, info),
2104                                 &exception);
2105         } while (exception.retry);
2106         return err;
2107 }
2108
2109 /*
2110  * get the file handle for the "/" directory on the server
2111  */
2112 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2113                               struct nfs_fsinfo *info)
2114 {
2115         int status;
2116
2117         status = nfs4_lookup_root(server, fhandle, info);
2118         if (status == 0)
2119                 status = nfs4_server_capabilities(server, fhandle);
2120         if (status == 0)
2121                 status = nfs4_do_fsinfo(server, fhandle, info);
2122         return nfs4_map_errors(status);
2123 }
2124
2125 /*
2126  * Get locations and (maybe) other attributes of a referral.
2127  * Note that we'll actually follow the referral later when
2128  * we detect fsid mismatch in inode revalidation
2129  */
2130 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2131 {
2132         int status = -ENOMEM;
2133         struct page *page = NULL;
2134         struct nfs4_fs_locations *locations = NULL;
2135
2136         page = alloc_page(GFP_KERNEL);
2137         if (page == NULL)
2138                 goto out;
2139         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2140         if (locations == NULL)
2141                 goto out;
2142
2143         status = nfs4_proc_fs_locations(dir, name, locations, page);
2144         if (status != 0)
2145                 goto out;
2146         /* Make sure server returned a different fsid for the referral */
2147         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2148                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2149                 status = -EIO;
2150                 goto out;
2151         }
2152
2153         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2154         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2155         if (!fattr->mode)
2156                 fattr->mode = S_IFDIR;
2157         memset(fhandle, 0, sizeof(struct nfs_fh));
2158 out:
2159         if (page)
2160                 __free_page(page);
2161         if (locations)
2162                 kfree(locations);
2163         return status;
2164 }
2165
2166 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2167 {
2168         struct nfs4_getattr_arg args = {
2169                 .fh = fhandle,
2170                 .bitmask = server->attr_bitmask,
2171         };
2172         struct nfs4_getattr_res res = {
2173                 .fattr = fattr,
2174                 .server = server,
2175         };
2176         struct rpc_message msg = {
2177                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2178                 .rpc_argp = &args,
2179                 .rpc_resp = &res,
2180         };
2181
2182         nfs_fattr_init(fattr);
2183         return nfs4_call_sync(server, &msg, &args, &res, 0);
2184 }
2185
2186 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2187 {
2188         struct nfs4_exception exception = { };
2189         int err;
2190         do {
2191                 err = nfs4_handle_exception(server,
2192                                 _nfs4_proc_getattr(server, fhandle, fattr),
2193                                 &exception);
2194         } while (exception.retry);
2195         return err;
2196 }
2197
2198 /*
2199  * The file is not closed if it is opened due to the a request to change
2200  * the size of the file. The open call will not be needed once the
2201  * VFS layer lookup-intents are implemented.
2202  *
2203  * Close is called when the inode is destroyed.
2204  * If we haven't opened the file for O_WRONLY, we
2205  * need to in the size_change case to obtain a stateid.
2206  *
2207  * Got race?
2208  * Because OPEN is always done by name in nfsv4, it is
2209  * possible that we opened a different file by the same
2210  * name.  We can recognize this race condition, but we
2211  * can't do anything about it besides returning an error.
2212  *
2213  * This will be fixed with VFS changes (lookup-intent).
2214  */
2215 static int
2216 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2217                   struct iattr *sattr)
2218 {
2219         struct inode *inode = dentry->d_inode;
2220         struct rpc_cred *cred = NULL;
2221         struct nfs4_state *state = NULL;
2222         int status;
2223
2224         nfs_fattr_init(fattr);
2225
2226         /* Search for an existing open(O_WRITE) file */
2227         if (sattr->ia_valid & ATTR_FILE) {
2228                 struct nfs_open_context *ctx;
2229
2230                 ctx = nfs_file_open_context(sattr->ia_file);
2231                 if (ctx) {
2232                         cred = ctx->cred;
2233                         state = ctx->state;
2234                 }
2235         }
2236
2237         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2238         if (status == 0)
2239                 nfs_setattr_update_inode(inode, sattr);
2240         return status;
2241 }
2242
2243 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2244                 const struct qstr *name, struct nfs_fh *fhandle,
2245                 struct nfs_fattr *fattr)
2246 {
2247         int                    status;
2248         struct nfs4_lookup_arg args = {
2249                 .bitmask = server->attr_bitmask,
2250                 .dir_fh = dirfh,
2251                 .name = name,
2252         };
2253         struct nfs4_lookup_res res = {
2254                 .server = server,
2255                 .fattr = fattr,
2256                 .fh = fhandle,
2257         };
2258         struct rpc_message msg = {
2259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2260                 .rpc_argp = &args,
2261                 .rpc_resp = &res,
2262         };
2263
2264         nfs_fattr_init(fattr);
2265
2266         dprintk("NFS call  lookupfh %s\n", name->name);
2267         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2268         dprintk("NFS reply lookupfh: %d\n", status);
2269         return status;
2270 }
2271
2272 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2273                               struct qstr *name, struct nfs_fh *fhandle,
2274                               struct nfs_fattr *fattr)
2275 {
2276         struct nfs4_exception exception = { };
2277         int err;
2278         do {
2279                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2280                 /* FIXME: !!!! */
2281                 if (err == -NFS4ERR_MOVED) {
2282                         err = -EREMOTE;
2283                         break;
2284                 }
2285                 err = nfs4_handle_exception(server, err, &exception);
2286         } while (exception.retry);
2287         return err;
2288 }
2289
2290 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2291                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2292 {
2293         int status;
2294
2295         dprintk("NFS call  lookup %s\n", name->name);
2296         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2297         if (status == -NFS4ERR_MOVED)
2298                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2299         dprintk("NFS reply lookup: %d\n", status);
2300         return status;
2301 }
2302
2303 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2304 {
2305         struct nfs4_exception exception = { };
2306         int err;
2307         do {
2308                 err = nfs4_handle_exception(NFS_SERVER(dir),
2309                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2310                                 &exception);
2311         } while (exception.retry);
2312         return err;
2313 }
2314
2315 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2316 {
2317         struct nfs_server *server = NFS_SERVER(inode);
2318         struct nfs_fattr fattr;
2319         struct nfs4_accessargs args = {
2320                 .fh = NFS_FH(inode),
2321                 .bitmask = server->attr_bitmask,
2322         };
2323         struct nfs4_accessres res = {
2324                 .server = server,
2325                 .fattr = &fattr,
2326         };
2327         struct rpc_message msg = {
2328                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2329                 .rpc_argp = &args,
2330                 .rpc_resp = &res,
2331                 .rpc_cred = entry->cred,
2332         };
2333         int mode = entry->mask;
2334         int status;
2335
2336         /*
2337          * Determine which access bits we want to ask for...
2338          */
2339         if (mode & MAY_READ)
2340                 args.access |= NFS4_ACCESS_READ;
2341         if (S_ISDIR(inode->i_mode)) {
2342                 if (mode & MAY_WRITE)
2343                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2344                 if (mode & MAY_EXEC)
2345                         args.access |= NFS4_ACCESS_LOOKUP;
2346         } else {
2347                 if (mode & MAY_WRITE)
2348                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2349                 if (mode & MAY_EXEC)
2350                         args.access |= NFS4_ACCESS_EXECUTE;
2351         }
2352         nfs_fattr_init(&fattr);
2353         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2354         if (!status) {
2355                 entry->mask = 0;
2356                 if (res.access & NFS4_ACCESS_READ)
2357                         entry->mask |= MAY_READ;
2358                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2359                         entry->mask |= MAY_WRITE;
2360                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2361                         entry->mask |= MAY_EXEC;
2362                 nfs_refresh_inode(inode, &fattr);
2363         }
2364         return status;
2365 }
2366
2367 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2368 {
2369         struct nfs4_exception exception = { };
2370         int err;
2371         do {
2372                 err = nfs4_handle_exception(NFS_SERVER(inode),
2373                                 _nfs4_proc_access(inode, entry),
2374                                 &exception);
2375         } while (exception.retry);
2376         return err;
2377 }
2378
2379 /*
2380  * TODO: For the time being, we don't try to get any attributes
2381  * along with any of the zero-copy operations READ, READDIR,
2382  * READLINK, WRITE.
2383  *
2384  * In the case of the first three, we want to put the GETATTR
2385  * after the read-type operation -- this is because it is hard
2386  * to predict the length of a GETATTR response in v4, and thus
2387  * align the READ data correctly.  This means that the GETATTR
2388  * may end up partially falling into the page cache, and we should
2389  * shift it into the 'tail' of the xdr_buf before processing.
2390  * To do this efficiently, we need to know the total length
2391  * of data received, which doesn't seem to be available outside
2392  * of the RPC layer.
2393  *
2394  * In the case of WRITE, we also want to put the GETATTR after
2395  * the operation -- in this case because we want to make sure
2396  * we get the post-operation mtime and size.  This means that
2397  * we can't use xdr_encode_pages() as written: we need a variant
2398  * of it which would leave room in the 'tail' iovec.
2399  *
2400  * Both of these changes to the XDR layer would in fact be quite
2401  * minor, but I decided to leave them for a subsequent patch.
2402  */
2403 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2404                 unsigned int pgbase, unsigned int pglen)
2405 {
2406         struct nfs4_readlink args = {
2407                 .fh       = NFS_FH(inode),
2408                 .pgbase   = pgbase,
2409                 .pglen    = pglen,
2410                 .pages    = &page,
2411         };
2412         struct nfs4_readlink_res res;
2413         struct rpc_message msg = {
2414                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2415                 .rpc_argp = &args,
2416                 .rpc_resp = &res,
2417         };
2418
2419         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2420 }
2421
2422 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2423                 unsigned int pgbase, unsigned int pglen)
2424 {
2425         struct nfs4_exception exception = { };
2426         int err;
2427         do {
2428                 err = nfs4_handle_exception(NFS_SERVER(inode),
2429                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2430                                 &exception);
2431         } while (exception.retry);
2432         return err;
2433 }
2434
2435 /*
2436  * Got race?
2437  * We will need to arrange for the VFS layer to provide an atomic open.
2438  * Until then, this create/open method is prone to inefficiency and race
2439  * conditions due to the lookup, create, and open VFS calls from sys_open()
2440  * placed on the wire.
2441  *
2442  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2443  * The file will be opened again in the subsequent VFS open call
2444  * (nfs4_proc_file_open).
2445  *
2446  * The open for read will just hang around to be used by any process that
2447  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2448  */
2449
2450 static int
2451 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2452                  int flags, struct nameidata *nd)
2453 {
2454         struct path path = {
2455                 .mnt = nd->path.mnt,
2456                 .dentry = dentry,
2457         };
2458         struct nfs4_state *state;
2459         struct rpc_cred *cred;
2460         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2461         int status = 0;
2462
2463         cred = rpc_lookup_cred();
2464         if (IS_ERR(cred)) {
2465                 status = PTR_ERR(cred);
2466                 goto out;
2467         }
2468         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2469         d_drop(dentry);
2470         if (IS_ERR(state)) {
2471                 status = PTR_ERR(state);
2472                 goto out_putcred;
2473         }
2474         d_add(dentry, igrab(state->inode));
2475         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2476         if (flags & O_EXCL) {
2477                 struct nfs_fattr fattr;
2478                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2479                 if (status == 0)
2480                         nfs_setattr_update_inode(state->inode, sattr);
2481                 nfs_post_op_update_inode(state->inode, &fattr);
2482         }
2483         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2484                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2485         else
2486                 nfs4_close_sync(&path, state, fmode);
2487 out_putcred:
2488         put_rpccred(cred);
2489 out:
2490         return status;
2491 }
2492
2493 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2494 {
2495         struct nfs_server *server = NFS_SERVER(dir);
2496         struct nfs_removeargs args = {
2497                 .fh = NFS_FH(dir),
2498                 .name.len = name->len,
2499                 .name.name = name->name,
2500                 .bitmask = server->attr_bitmask,
2501         };
2502         struct nfs_removeres res = {
2503                 .server = server,
2504         };
2505         struct rpc_message msg = {
2506                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2507                 .rpc_argp = &args,
2508                 .rpc_resp = &res,
2509         };
2510         int                     status;
2511
2512         nfs_fattr_init(&res.dir_attr);
2513         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2514         if (status == 0) {
2515                 update_changeattr(dir, &res.cinfo);
2516                 nfs_post_op_update_inode(dir, &res.dir_attr);
2517         }
2518         return status;
2519 }
2520
2521 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2522 {
2523         struct nfs4_exception exception = { };
2524         int err;
2525         do {
2526                 err = nfs4_handle_exception(NFS_SERVER(dir),
2527                                 _nfs4_proc_remove(dir, name),
2528                                 &exception);
2529         } while (exception.retry);
2530         return err;
2531 }
2532
2533 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2534 {
2535         struct nfs_server *server = NFS_SERVER(dir);
2536         struct nfs_removeargs *args = msg->rpc_argp;
2537         struct nfs_removeres *res = msg->rpc_resp;
2538
2539         args->bitmask = server->cache_consistency_bitmask;
2540         res->server = server;
2541         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2542 }
2543
2544 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2545 {
2546         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2547
2548         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2549         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2550                 return 0;
2551         update_changeattr(dir, &res->cinfo);
2552         nfs_post_op_update_inode(dir, &res->dir_attr);
2553         return 1;
2554 }
2555
2556 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2557                 struct inode *new_dir, struct qstr *new_name)
2558 {
2559         struct nfs_server *server = NFS_SERVER(old_dir);
2560         struct nfs4_rename_arg arg = {
2561                 .old_dir = NFS_FH(old_dir),
2562                 .new_dir = NFS_FH(new_dir),
2563                 .old_name = old_name,
2564                 .new_name = new_name,
2565                 .bitmask = server->attr_bitmask,
2566         };
2567         struct nfs_fattr old_fattr, new_fattr;
2568         struct nfs4_rename_res res = {
2569                 .server = server,
2570                 .old_fattr = &old_fattr,
2571                 .new_fattr = &new_fattr,
2572         };
2573         struct rpc_message msg = {
2574                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2575                 .rpc_argp = &arg,
2576                 .rpc_resp = &res,
2577         };
2578         int                     status;
2579
2580         nfs_fattr_init(res.old_fattr);
2581         nfs_fattr_init(res.new_fattr);
2582         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2583
2584         if (!status) {
2585                 update_changeattr(old_dir, &res.old_cinfo);
2586                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2587                 update_changeattr(new_dir, &res.new_cinfo);
2588                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2589         }
2590         return status;
2591 }
2592
2593 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2594                 struct inode *new_dir, struct qstr *new_name)
2595 {
2596         struct nfs4_exception exception = { };
2597         int err;
2598         do {
2599                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2600                                 _nfs4_proc_rename(old_dir, old_name,
2601                                         new_dir, new_name),
2602                                 &exception);
2603         } while (exception.retry);
2604         return err;
2605 }
2606
2607 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2608 {
2609         struct nfs_server *server = NFS_SERVER(inode);
2610         struct nfs4_link_arg arg = {
2611                 .fh     = NFS_FH(inode),
2612                 .dir_fh = NFS_FH(dir),
2613                 .name   = name,
2614                 .bitmask = server->attr_bitmask,
2615         };
2616         struct nfs_fattr fattr, dir_attr;
2617         struct nfs4_link_res res = {
2618                 .server = server,
2619                 .fattr = &fattr,
2620                 .dir_attr = &dir_attr,
2621         };
2622         struct rpc_message msg = {
2623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2624                 .rpc_argp = &arg,
2625                 .rpc_resp = &res,
2626         };
2627         int                     status;
2628
2629         nfs_fattr_init(res.fattr);
2630         nfs_fattr_init(res.dir_attr);
2631         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2632         if (!status) {
2633                 update_changeattr(dir, &res.cinfo);
2634                 nfs_post_op_update_inode(dir, res.dir_attr);
2635                 nfs_post_op_update_inode(inode, res.fattr);
2636         }
2637
2638         return status;
2639 }
2640
2641 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2642 {
2643         struct nfs4_exception exception = { };
2644         int err;
2645         do {
2646                 err = nfs4_handle_exception(NFS_SERVER(inode),
2647                                 _nfs4_proc_link(inode, dir, name),
2648                                 &exception);
2649         } while (exception.retry);
2650         return err;
2651 }
2652
2653 struct nfs4_createdata {
2654         struct rpc_message msg;
2655         struct nfs4_create_arg arg;
2656         struct nfs4_create_res res;
2657         struct nfs_fh fh;
2658         struct nfs_fattr fattr;
2659         struct nfs_fattr dir_fattr;
2660 };
2661
2662 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2663                 struct qstr *name, struct iattr *sattr, u32 ftype)
2664 {
2665         struct nfs4_createdata *data;
2666
2667         data = kzalloc(sizeof(*data), GFP_KERNEL);
2668         if (data != NULL) {
2669                 struct nfs_server *server = NFS_SERVER(dir);
2670
2671                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2672                 data->msg.rpc_argp = &data->arg;
2673                 data->msg.rpc_resp = &data->res;
2674                 data->arg.dir_fh = NFS_FH(dir);
2675                 data->arg.server = server;
2676                 data->arg.name = name;
2677                 data->arg.attrs = sattr;
2678                 data->arg.ftype = ftype;
2679                 data->arg.bitmask = server->attr_bitmask;
2680                 data->res.server = server;
2681                 data->res.fh = &data->fh;
2682                 data->res.fattr = &data->fattr;
2683                 data->res.dir_fattr = &data->dir_fattr;
2684                 nfs_fattr_init(data->res.fattr);
2685                 nfs_fattr_init(data->res.dir_fattr);
2686         }
2687         return data;
2688 }
2689
2690 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2691 {
2692         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2693                                     &data->arg, &data->res, 1);
2694         if (status == 0) {
2695                 update_changeattr(dir, &data->res.dir_cinfo);
2696                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2697                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2698         }
2699         return status;
2700 }
2701
2702 static void nfs4_free_createdata(struct nfs4_createdata *data)
2703 {
2704         kfree(data);
2705 }
2706
2707 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2708                 struct page *page, unsigned int len, struct iattr *sattr)
2709 {
2710         struct nfs4_createdata *data;
2711         int status = -ENAMETOOLONG;
2712
2713         if (len > NFS4_MAXPATHLEN)
2714                 goto out;
2715
2716         status = -ENOMEM;
2717         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2718         if (data == NULL)
2719                 goto out;
2720
2721         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2722         data->arg.u.symlink.pages = &page;
2723         data->arg.u.symlink.len = len;
2724
2725         status = nfs4_do_create(dir, dentry, data);
2726
2727         nfs4_free_createdata(data);
2728 out:
2729         return status;
2730 }
2731
2732 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2733                 struct page *page, unsigned int len, struct iattr *sattr)
2734 {
2735         struct nfs4_exception exception = { };
2736         int err;
2737         do {
2738                 err = nfs4_handle_exception(NFS_SERVER(dir),
2739                                 _nfs4_proc_symlink(dir, dentry, page,
2740                                                         len, sattr),
2741                                 &exception);
2742         } while (exception.retry);
2743         return err;
2744 }
2745
2746 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2747                 struct iattr *sattr)
2748 {
2749         struct nfs4_createdata *data;
2750         int status = -ENOMEM;
2751
2752         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2753         if (data == NULL)
2754                 goto out;
2755
2756         status = nfs4_do_create(dir, dentry, data);
2757
2758         nfs4_free_createdata(data);
2759 out:
2760         return status;
2761 }
2762
2763 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2764                 struct iattr *sattr)
2765 {
2766         struct nfs4_exception exception = { };
2767         int err;
2768         do {
2769                 err = nfs4_handle_exception(NFS_SERVER(dir),
2770                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2771                                 &exception);
2772         } while (exception.retry);
2773         return err;
2774 }
2775
2776 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2777                   u64 cookie, struct page *page, unsigned int count, int plus)
2778 {
2779         struct inode            *dir = dentry->d_inode;
2780         struct nfs4_readdir_arg args = {
2781                 .fh = NFS_FH(dir),
2782                 .pages = &page,
2783                 .pgbase = 0,
2784                 .count = count,
2785                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2786         };
2787         struct nfs4_readdir_res res;
2788         struct rpc_message msg = {
2789                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2790                 .rpc_argp = &args,
2791                 .rpc_resp = &res,
2792                 .rpc_cred = cred,
2793         };
2794         int                     status;
2795
2796         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2797                         dentry->d_parent->d_name.name,
2798                         dentry->d_name.name,
2799                         (unsigned long long)cookie);
2800         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2801         res.pgbase = args.pgbase;
2802         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2803         if (status == 0)
2804                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2805
2806         nfs_invalidate_atime(dir);
2807
2808         dprintk("%s: returns %d\n", __func__, status);
2809         return status;
2810 }
2811
2812 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2813                   u64 cookie, struct page *page, unsigned int count, int plus)
2814 {
2815         struct nfs4_exception exception = { };
2816         int err;
2817         do {
2818                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2819                                 _nfs4_proc_readdir(dentry, cred, cookie,
2820                                         page, count, plus),
2821                                 &exception);
2822         } while (exception.retry);
2823         return err;
2824 }
2825
2826 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2827                 struct iattr *sattr, dev_t rdev)
2828 {
2829         struct nfs4_createdata *data;
2830         int mode = sattr->ia_mode;
2831         int status = -ENOMEM;
2832
2833         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2834         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2835
2836         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2837         if (data == NULL)
2838                 goto out;
2839
2840         if (S_ISFIFO(mode))
2841                 data->arg.ftype = NF4FIFO;
2842         else if (S_ISBLK(mode)) {
2843                 data->arg.ftype = NF4BLK;
2844                 data->arg.u.device.specdata1 = MAJOR(rdev);
2845                 data->arg.u.device.specdata2 = MINOR(rdev);
2846         }
2847         else if (S_ISCHR(mode)) {
2848                 data->arg.ftype = NF4CHR;
2849                 data->arg.u.device.specdata1 = MAJOR(rdev);
2850                 data->arg.u.device.specdata2 = MINOR(rdev);
2851         }
2852
2853         status = nfs4_do_create(dir, dentry, data);
2854
2855         nfs4_free_createdata(data);
2856 out:
2857         return status;
2858 }
2859
2860 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2861                 struct iattr *sattr, dev_t rdev)
2862 {
2863         struct nfs4_exception exception = { };
2864         int err;
2865         do {
2866                 err = nfs4_handle_exception(NFS_SERVER(dir),
2867                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2868                                 &exception);
2869         } while (exception.retry);
2870         return err;
2871 }
2872
2873 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2874                  struct nfs_fsstat *fsstat)
2875 {
2876         struct nfs4_statfs_arg args = {
2877                 .fh = fhandle,
2878                 .bitmask = server->attr_bitmask,
2879         };
2880         struct nfs4_statfs_res res = {
2881                 .fsstat = fsstat,
2882         };
2883         struct rpc_message msg = {
2884                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2885                 .rpc_argp = &args,
2886                 .rpc_resp = &res,
2887         };
2888
2889         nfs_fattr_init(fsstat->fattr);
2890         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2891 }
2892
2893 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2894 {
2895         struct nfs4_exception exception = { };
2896         int err;
2897         do {
2898                 err = nfs4_handle_exception(server,
2899                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2900                                 &exception);
2901         } while (exception.retry);
2902         return err;
2903 }
2904
2905 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2906                 struct nfs_fsinfo *fsinfo)
2907 {
2908         struct nfs4_fsinfo_arg args = {
2909                 .fh = fhandle,
2910                 .bitmask = server->attr_bitmask,
2911         };
2912         struct nfs4_fsinfo_res res = {
2913                 .fsinfo = fsinfo,
2914         };
2915         struct rpc_message msg = {
2916                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2917                 .rpc_argp = &args,
2918                 .rpc_resp = &res,
2919         };
2920
2921         return nfs4_call_sync(server, &msg, &args, &res, 0);
2922 }
2923
2924 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2925 {
2926         struct nfs4_exception exception = { };
2927         int err;
2928
2929         do {
2930                 err = nfs4_handle_exception(server,
2931                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2932                                 &exception);
2933         } while (exception.retry);
2934         return err;
2935 }
2936
2937 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2938 {
2939         nfs_fattr_init(fsinfo->fattr);
2940         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2941 }
2942
2943 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2944                 struct nfs_pathconf *pathconf)
2945 {
2946         struct nfs4_pathconf_arg args = {
2947                 .fh = fhandle,
2948                 .bitmask = server->attr_bitmask,
2949         };
2950         struct nfs4_pathconf_res res = {
2951                 .pathconf = pathconf,
2952         };
2953         struct rpc_message msg = {
2954                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2955                 .rpc_argp = &args,
2956                 .rpc_resp = &res,
2957         };
2958
2959         /* None of the pathconf attributes are mandatory to implement */
2960         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2961                 memset(pathconf, 0, sizeof(*pathconf));
2962                 return 0;
2963         }
2964
2965         nfs_fattr_init(pathconf->fattr);
2966         return nfs4_call_sync(server, &msg, &args, &res, 0);
2967 }
2968
2969 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2970                 struct nfs_pathconf *pathconf)
2971 {
2972         struct nfs4_exception exception = { };
2973         int err;
2974
2975         do {
2976                 err = nfs4_handle_exception(server,
2977                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2978                                 &exception);
2979         } while (exception.retry);
2980         return err;
2981 }
2982
2983 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2984 {
2985         struct nfs_server *server = NFS_SERVER(data->inode);
2986
2987         dprintk("--> %s\n", __func__);
2988
2989         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2990
2991         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2992                 nfs_restart_rpc(task, server->nfs_client);
2993                 return -EAGAIN;
2994         }
2995
2996         nfs_invalidate_atime(data->inode);
2997         if (task->tk_status > 0)
2998                 renew_lease(server, data->timestamp);
2999         return 0;
3000 }
3001
3002 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3003 {
3004         data->timestamp   = jiffies;
3005         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3006 }
3007
3008 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3009 {
3010         struct inode *inode = data->inode;
3011
3012         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3013                            task->tk_status);
3014
3015         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3016                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3017                 return -EAGAIN;
3018         }
3019         if (task->tk_status >= 0) {
3020                 renew_lease(NFS_SERVER(inode), data->timestamp);
3021                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3022         }
3023         return 0;
3024 }
3025
3026 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3027 {
3028         struct nfs_server *server = NFS_SERVER(data->inode);
3029
3030         data->args.bitmask = server->cache_consistency_bitmask;
3031         data->res.server = server;
3032         data->timestamp   = jiffies;
3033
3034         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3035 }
3036
3037 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3038 {
3039         struct inode *inode = data->inode;
3040
3041         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3042                            task->tk_status);
3043         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3044                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3045                 return -EAGAIN;
3046         }
3047         nfs_refresh_inode(inode, data->res.fattr);
3048         return 0;
3049 }
3050
3051 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3052 {
3053         struct nfs_server *server = NFS_SERVER(data->inode);
3054
3055         data->args.bitmask = server->cache_consistency_bitmask;
3056         data->res.server = server;
3057         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3058 }
3059
3060 /*
3061  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3062  * standalone procedure for queueing an asynchronous RENEW.
3063  */
3064 static void nfs4_renew_done(struct rpc_task *task, void *data)
3065 {
3066         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3067         unsigned long timestamp = (unsigned long)data;
3068
3069         if (task->tk_status < 0) {
3070                 /* Unless we're shutting down, schedule state recovery! */
3071                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3072                         nfs4_schedule_state_recovery(clp);
3073                 return;
3074         }
3075         spin_lock(&clp->cl_lock);
3076         if (time_before(clp->cl_last_renewal,timestamp))
3077                 clp->cl_last_renewal = timestamp;
3078         spin_unlock(&clp->cl_lock);
3079 }
3080
3081 static const struct rpc_call_ops nfs4_renew_ops = {
3082         .rpc_call_done = nfs4_renew_done,
3083 };
3084
3085 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3086 {
3087         struct rpc_message msg = {
3088                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3089                 .rpc_argp       = clp,
3090                 .rpc_cred       = cred,
3091         };
3092
3093         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3094                         &nfs4_renew_ops, (void *)jiffies);
3095 }
3096
3097 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3098 {
3099         struct rpc_message msg = {
3100                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3101                 .rpc_argp       = clp,
3102                 .rpc_cred       = cred,
3103         };
3104         unsigned long now = jiffies;
3105         int status;
3106
3107         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3108         if (status < 0)
3109                 return status;
3110         spin_lock(&clp->cl_lock);
3111         if (time_before(clp->cl_last_renewal,now))
3112                 clp->cl_last_renewal = now;
3113         spin_unlock(&clp->cl_lock);
3114         return 0;
3115 }
3116
3117 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3118 {
3119         return (server->caps & NFS_CAP_ACLS)
3120                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3121                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3122 }
3123
3124 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3125  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3126  * the stack.
3127  */
3128 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3129
3130 static void buf_to_pages(const void *buf, size_t buflen,
3131                 struct page **pages, unsigned int *pgbase)
3132 {
3133         const void *p = buf;
3134
3135         *pgbase = offset_in_page(buf);
3136         p -= *pgbase;
3137         while (p < buf + buflen) {
3138                 *(pages++) = virt_to_page(p);
3139                 p += PAGE_CACHE_SIZE;
3140         }
3141 }
3142
3143 struct nfs4_cached_acl {
3144         int cached;
3145         size_t len;
3146         char data[0];
3147 };
3148
3149 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3150 {
3151         struct nfs_inode *nfsi = NFS_I(inode);
3152
3153         spin_lock(&inode->i_lock);
3154         kfree(nfsi->nfs4_acl);
3155         nfsi->nfs4_acl = acl;
3156         spin_unlock(&inode->i_lock);
3157 }
3158
3159 static void nfs4_zap_acl_attr(struct inode *inode)
3160 {
3161         nfs4_set_cached_acl(inode, NULL);
3162 }
3163
3164 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3165 {
3166         struct nfs_inode *nfsi = NFS_I(inode);
3167         struct nfs4_cached_acl *acl;
3168         int ret = -ENOENT;
3169
3170         spin_lock(&inode->i_lock);
3171         acl = nfsi->nfs4_acl;
3172         if (acl == NULL)
3173                 goto out;
3174         if (buf == NULL) /* user is just asking for length */
3175                 goto out_len;
3176         if (acl->cached == 0)
3177                 goto out;
3178         ret = -ERANGE; /* see getxattr(2) man page */
3179         if (acl->len > buflen)
3180                 goto out;
3181         memcpy(buf, acl->data, acl->len);
3182 out_len:
3183         ret = acl->len;
3184 out:
3185         spin_unlock(&inode->i_lock);
3186         return ret;
3187 }
3188
3189 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3190 {
3191         struct nfs4_cached_acl *acl;
3192
3193         if (buf && acl_len <= PAGE_SIZE) {
3194                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3195                 if (acl == NULL)
3196                         goto out;
3197                 acl->cached = 1;
3198                 memcpy(acl->data, buf, acl_len);
3199         } else {
3200                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3201                 if (acl == NULL)
3202                         goto out;
3203                 acl->cached = 0;
3204         }
3205         acl->len = acl_len;
3206 out:
3207         nfs4_set_cached_acl(inode, acl);
3208 }
3209
3210 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3211 {
3212         struct page *pages[NFS4ACL_MAXPAGES];
3213         struct nfs_getaclargs args = {
3214                 .fh = NFS_FH(inode),
3215                 .acl_pages = pages,
3216                 .acl_len = buflen,
3217         };
3218         struct nfs_getaclres res = {
3219                 .acl_len = buflen,
3220         };
3221         void *resp_buf;
3222         struct rpc_message msg = {
3223                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3224                 .rpc_argp = &args,
3225                 .rpc_resp = &res,
3226         };
3227         struct page *localpage = NULL;
3228         int ret;
3229
3230         if (buflen < PAGE_SIZE) {
3231                 /* As long as we're doing a round trip to the server anyway,
3232                  * let's be prepared for a page of acl data. */
3233                 localpage = alloc_page(GFP_KERNEL);
3234                 resp_buf = page_address(localpage);
3235                 if (localpage == NULL)
3236                         return -ENOMEM;
3237                 args.acl_pages[0] = localpage;
3238                 args.acl_pgbase = 0;
3239                 args.acl_len = PAGE_SIZE;
3240         } else {
3241                 resp_buf = buf;
3242                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3243         }
3244         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3245         if (ret)
3246                 goto out_free;
3247         if (res.acl_len > args.acl_len)
3248                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3249         else
3250                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3251         if (buf) {
3252                 ret = -ERANGE;
3253                 if (res.acl_len > buflen)
3254                         goto out_free;
3255                 if (localpage)
3256                         memcpy(buf, resp_buf, res.acl_len);
3257         }
3258         ret = res.acl_len;
3259 out_free:
3260         if (localpage)
3261                 __free_page(localpage);
3262         return ret;
3263 }
3264
3265 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3266 {
3267         struct nfs4_exception exception = { };
3268         ssize_t ret;
3269         do {
3270                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3271                 if (ret >= 0)
3272                         break;
3273                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3274         } while (exception.retry);
3275         return ret;
3276 }
3277
3278 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3279 {
3280         struct nfs_server *server = NFS_SERVER(inode);
3281         int ret;
3282
3283         if (!nfs4_server_supports_acls(server))
3284                 return -EOPNOTSUPP;
3285         ret = nfs_revalidate_inode(server, inode);
3286         if (ret < 0)
3287                 return ret;
3288         ret = nfs4_read_cached_acl(inode, buf, buflen);
3289         if (ret != -ENOENT)
3290                 return ret;
3291         return nfs4_get_acl_uncached(inode, buf, buflen);
3292 }
3293
3294 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3295 {
3296         struct nfs_server *server = NFS_SERVER(inode);
3297         struct page *pages[NFS4ACL_MAXPAGES];
3298         struct nfs_setaclargs arg = {
3299                 .fh             = NFS_FH(inode),
3300                 .acl_pages      = pages,
3301                 .acl_len        = buflen,
3302         };
3303         struct nfs_setaclres res;
3304         struct rpc_message msg = {
3305                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3306                 .rpc_argp       = &arg,
3307                 .rpc_resp       = &res,
3308         };
3309         int ret;
3310
3311         if (!nfs4_server_supports_acls(server))
3312                 return -EOPNOTSUPP;
3313         nfs_inode_return_delegation(inode);
3314         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3315         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3316         nfs_access_zap_cache(inode);
3317         nfs_zap_acl_cache(inode);
3318         return ret;
3319 }
3320
3321 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3322 {
3323         struct nfs4_exception exception = { };
3324         int err;
3325         do {
3326                 err = nfs4_handle_exception(NFS_SERVER(inode),
3327                                 __nfs4_proc_set_acl(inode, buf, buflen),
3328                                 &exception);
3329         } while (exception.retry);
3330         return err;
3331 }
3332
3333 static int
3334 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3335 {
3336         if (!clp || task->tk_status >= 0)
3337                 return 0;
3338         switch(task->tk_status) {
3339                 case -NFS4ERR_ADMIN_REVOKED:
3340                 case -NFS4ERR_BAD_STATEID:
3341                 case -NFS4ERR_OPENMODE:
3342                         if (state == NULL)
3343                                 break;
3344                         nfs4_state_mark_reclaim_nograce(clp, state);
3345                 case -NFS4ERR_STALE_CLIENTID:
3346                 case -NFS4ERR_STALE_STATEID:
3347                 case -NFS4ERR_EXPIRED:
3348                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3349                         nfs4_schedule_state_recovery(clp);
3350                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3351                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3352                         task->tk_status = 0;
3353                         return -EAGAIN;
3354 #if defined(CONFIG_NFS_V4_1)
3355                 case -NFS4ERR_BADSESSION:
3356                 case -NFS4ERR_BADSLOT:
3357                 case -NFS4ERR_BAD_HIGH_SLOT:
3358                 case -NFS4ERR_DEADSESSION:
3359                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3360                 case -NFS4ERR_SEQ_FALSE_RETRY:
3361                 case -NFS4ERR_SEQ_MISORDERED:
3362                         dprintk("%s ERROR %d, Reset session\n", __func__,
3363                                 task->tk_status);
3364                         nfs4_schedule_state_recovery(clp);
3365                         task->tk_status = 0;
3366                         return -EAGAIN;
3367 #endif /* CONFIG_NFS_V4_1 */
3368                 case -NFS4ERR_DELAY:
3369                         if (server)
3370                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3371                 case -NFS4ERR_GRACE:
3372                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3373                         task->tk_status = 0;
3374                         return -EAGAIN;
3375                 case -NFS4ERR_OLD_STATEID:
3376                         task->tk_status = 0;
3377                         return -EAGAIN;
3378         }
3379         task->tk_status = nfs4_map_errors(task->tk_status);
3380         return 0;
3381 }
3382
3383 static int
3384 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3385 {
3386         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3387 }
3388
3389 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3390 {
3391         nfs4_verifier sc_verifier;
3392         struct nfs4_setclientid setclientid = {
3393                 .sc_verifier = &sc_verifier,
3394                 .sc_prog = program,
3395         };
3396         struct rpc_message msg = {
3397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3398                 .rpc_argp = &setclientid,
3399                 .rpc_resp = clp,
3400                 .rpc_cred = cred,
3401         };
3402         __be32 *p;
3403         int loop = 0;
3404         int status;
3405
3406         p = (__be32*)sc_verifier.data;
3407         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3408         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3409
3410         for(;;) {
3411                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3412                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3413                                 clp->cl_ipaddr,
3414                                 rpc_peeraddr2str(clp->cl_rpcclient,
3415                                                         RPC_DISPLAY_ADDR),
3416                                 rpc_peeraddr2str(clp->cl_rpcclient,
3417                                                         RPC_DISPLAY_PROTO),
3418                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3419                                 clp->cl_id_uniquifier);
3420                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3421                                 sizeof(setclientid.sc_netid),
3422                                 rpc_peeraddr2str(clp->cl_rpcclient,
3423                                                         RPC_DISPLAY_NETID));
3424                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3425                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3426                                 clp->cl_ipaddr, port >> 8, port & 255);
3427
3428                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3429                 if (status != -NFS4ERR_CLID_INUSE)
3430                         break;
3431                 if (signalled())
3432                         break;
3433                 if (loop++ & 1)
3434                         ssleep(clp->cl_lease_time + 1);
3435                 else
3436                         if (++clp->cl_id_uniquifier == 0)
3437                                 break;
3438         }
3439         return status;
3440 }
3441
3442 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3443 {
3444         struct nfs_fsinfo fsinfo;
3445         struct rpc_message msg = {
3446                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3447                 .rpc_argp = clp,
3448                 .rpc_resp = &fsinfo,
3449                 .rpc_cred = cred,
3450         };
3451         unsigned long now;
3452         int status;
3453
3454         now = jiffies;
3455         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3456         if (status == 0) {
3457                 spin_lock(&clp->cl_lock);
3458                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3459                 clp->cl_last_renewal = now;
3460                 spin_unlock(&clp->cl_lock);
3461         }
3462         return status;
3463 }
3464
3465 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3466 {
3467         long timeout = 0;
3468         int err;
3469         do {
3470                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3471                 switch (err) {
3472                         case 0:
3473                                 return err;
3474                         case -NFS4ERR_RESOURCE:
3475                                 /* The IBM lawyers misread another document! */
3476                         case -NFS4ERR_DELAY:
3477                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3478                 }
3479         } while (err == 0);
3480         return err;
3481 }
3482
3483 struct nfs4_delegreturndata {
3484         struct nfs4_delegreturnargs args;
3485         struct nfs4_delegreturnres res;
3486         struct nfs_fh fh;
3487         nfs4_stateid stateid;
3488         unsigned long timestamp;
3489         struct nfs_fattr fattr;
3490         int rpc_status;
3491 };
3492
3493 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3494 {
3495         struct nfs4_delegreturndata *data = calldata;
3496
3497         nfs4_sequence_done(data->res.server, &data->res.seq_res,
3498                         task->tk_status);
3499
3500         switch (task->tk_status) {
3501         case -NFS4ERR_STALE_STATEID:
3502         case -NFS4ERR_EXPIRED:
3503         case 0:
3504                 renew_lease(data->res.server, data->timestamp);
3505                 break;
3506         default:
3507                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3508                                 -EAGAIN) {
3509                         nfs_restart_rpc(task, data->res.server->nfs_client);
3510                         return;
3511                 }
3512         }
3513         data->rpc_status = task->tk_status;
3514 }
3515
3516 static void nfs4_delegreturn_release(void *calldata)
3517 {
3518         kfree(calldata);
3519 }
3520
3521 #if defined(CONFIG_NFS_V4_1)
3522 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3523 {
3524         struct nfs4_delegreturndata *d_data;
3525
3526         d_data = (struct nfs4_delegreturndata *)data;
3527
3528         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3529                                 &d_data->args.seq_args,
3530                                 &d_data->res.seq_res, 1, task))
3531                 return;
3532         rpc_call_start(task);
3533 }
3534 #endif /* CONFIG_NFS_V4_1 */
3535
3536 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3537 #if defined(CONFIG_NFS_V4_1)
3538         .rpc_call_prepare = nfs4_delegreturn_prepare,
3539 #endif /* CONFIG_NFS_V4_1 */
3540         .rpc_call_done = nfs4_delegreturn_done,
3541         .rpc_release = nfs4_delegreturn_release,
3542 };
3543
3544 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3545 {
3546         struct nfs4_delegreturndata *data;
3547         struct nfs_server *server = NFS_SERVER(inode);
3548         struct rpc_task *task;
3549         struct rpc_message msg = {
3550                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3551                 .rpc_cred = cred,
3552         };
3553         struct rpc_task_setup task_setup_data = {
3554                 .rpc_client = server->client,
3555                 .rpc_message = &msg,
3556                 .callback_ops = &nfs4_delegreturn_ops,
3557                 .flags = RPC_TASK_ASYNC,
3558         };
3559         int status = 0;
3560
3561         data = kzalloc(sizeof(*data), GFP_KERNEL);
3562         if (data == NULL)
3563                 return -ENOMEM;
3564         data->args.fhandle = &data->fh;
3565         data->args.stateid = &data->stateid;
3566         data->args.bitmask = server->attr_bitmask;
3567         nfs_copy_fh(&data->fh, NFS_FH(inode));
3568         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3569         data->res.fattr = &data->fattr;
3570         data->res.server = server;
3571         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3572         nfs_fattr_init(data->res.fattr);
3573         data->timestamp = jiffies;
3574         data->rpc_status = 0;
3575
3576         task_setup_data.callback_data = data;
3577         msg.rpc_argp = &data->args,
3578         msg.rpc_resp = &data->res,
3579         task = rpc_run_task(&task_setup_data);
3580         if (IS_ERR(task))
3581                 return PTR_ERR(task);
3582         if (!issync)
3583                 goto out;
3584         status = nfs4_wait_for_completion_rpc_task(task);
3585         if (status != 0)
3586                 goto out;
3587         status = data->rpc_status;
3588         if (status != 0)
3589                 goto out;
3590         nfs_refresh_inode(inode, &data->fattr);
3591 out:
3592         rpc_put_task(task);
3593         return status;
3594 }
3595
3596 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3597 {
3598         struct nfs_server *server = NFS_SERVER(inode);
3599         struct nfs4_exception exception = { };
3600         int err;
3601         do {
3602                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3603                 switch (err) {
3604                         case -NFS4ERR_STALE_STATEID:
3605                         case -NFS4ERR_EXPIRED:
3606                         case 0:
3607                                 return 0;
3608                 }
3609                 err = nfs4_handle_exception(server, err, &exception);
3610         } while (exception.retry);
3611         return err;
3612 }
3613
3614 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3615 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3616
3617 /*
3618  * sleep, with exponential backoff, and retry the LOCK operation.
3619  */
3620 static unsigned long
3621 nfs4_set_lock_task_retry(unsigned long timeout)
3622 {
3623         schedule_timeout_killable(timeout);
3624         timeout <<= 1;
3625         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3626                 return NFS4_LOCK_MAXTIMEOUT;
3627         return timeout;
3628 }
3629
3630 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3631 {
3632         struct inode *inode = state->inode;
3633         struct nfs_server *server = NFS_SERVER(inode);
3634         struct nfs_client *clp = server->nfs_client;
3635         struct nfs_lockt_args arg = {
3636                 .fh = NFS_FH(inode),
3637                 .fl = request,
3638         };
3639         struct nfs_lockt_res res = {
3640                 .denied = request,
3641         };
3642         struct rpc_message msg = {
3643                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3644                 .rpc_argp       = &arg,
3645                 .rpc_resp       = &res,
3646                 .rpc_cred       = state->owner->so_cred,
3647         };
3648         struct nfs4_lock_state *lsp;
3649         int status;
3650
3651         arg.lock_owner.clientid = clp->cl_clientid;
3652         status = nfs4_set_lock_state(state, request);
3653         if (status != 0)
3654                 goto out;
3655         lsp = request->fl_u.nfs4_fl.owner;
3656         arg.lock_owner.id = lsp->ls_id.id;
3657         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3658         switch (status) {
3659                 case 0:
3660                         request->fl_type = F_UNLCK;
3661                         break;
3662                 case -NFS4ERR_DENIED:
3663                         status = 0;
3664         }
3665         request->fl_ops->fl_release_private(request);
3666 out:
3667         return status;
3668 }
3669
3670 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3671 {
3672         struct nfs4_exception exception = { };
3673         int err;
3674
3675         do {
3676                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3677                                 _nfs4_proc_getlk(state, cmd, request),
3678                                 &exception);
3679         } while (exception.retry);
3680         return err;
3681 }
3682
3683 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3684 {
3685         int res = 0;
3686         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3687                 case FL_POSIX:
3688                         res = posix_lock_file_wait(file, fl);
3689                         break;
3690                 case FL_FLOCK:
3691                         res = flock_lock_file_wait(file, fl);
3692                         break;
3693                 default:
3694                         BUG();
3695         }
3696         return res;
3697 }
3698
3699 struct nfs4_unlockdata {
3700         struct nfs_locku_args arg;
3701         struct nfs_locku_res res;
3702         struct nfs4_lock_state *lsp;
3703         struct nfs_open_context *ctx;
3704         struct file_lock fl;
3705         const struct nfs_server *server;
3706         unsigned long timestamp;
3707 };
3708
3709 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3710                 struct nfs_open_context *ctx,
3711                 struct nfs4_lock_state *lsp,
3712                 struct nfs_seqid *seqid)
3713 {
3714         struct nfs4_unlockdata *p;
3715         struct inode *inode = lsp->ls_state->inode;
3716
3717         p = kzalloc(sizeof(*p), GFP_KERNEL);
3718         if (p == NULL)
3719                 return NULL;
3720         p->arg.fh = NFS_FH(inode);
3721         p->arg.fl = &p->fl;
3722         p->arg.seqid = seqid;
3723         p->res.seqid = seqid;
3724         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3725         p->arg.stateid = &lsp->ls_stateid;
3726         p->lsp = lsp;
3727         atomic_inc(&lsp->ls_count);
3728         /* Ensure we don't close file until we're done freeing locks! */
3729         p->ctx = get_nfs_open_context(ctx);
3730         memcpy(&p->fl, fl, sizeof(p->fl));
3731         p->server = NFS_SERVER(inode);
3732         return p;
3733 }
3734
3735 static void nfs4_locku_release_calldata(void *data)
3736 {
3737         struct nfs4_unlockdata *calldata = data;
3738         nfs_free_seqid(calldata->arg.seqid);
3739         nfs4_put_lock_state(calldata->lsp);
3740         put_nfs_open_context(calldata->ctx);
3741         kfree(calldata);
3742 }
3743
3744 static void nfs4_locku_done(struct rpc_task *task, void *data)
3745 {
3746         struct nfs4_unlockdata *calldata = data;
3747
3748         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3749                            task->tk_status);
3750         if (RPC_ASSASSINATED(task))
3751                 return;
3752         switch (task->tk_status) {
3753                 case 0:
3754                         memcpy(calldata->lsp->ls_stateid.data,
3755                                         calldata->res.stateid.data,
3756                                         sizeof(calldata->lsp->ls_stateid.data));
3757                         renew_lease(calldata->server, calldata->timestamp);
3758                         break;
3759                 case -NFS4ERR_BAD_STATEID:
3760                 case -NFS4ERR_OLD_STATEID:
3761                 case -NFS4ERR_STALE_STATEID:
3762                 case -NFS4ERR_EXPIRED:
3763                         break;
3764                 default:
3765                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3766                                 nfs_restart_rpc(task,
3767                                                  calldata->server->nfs_client);
3768         }
3769 }
3770
3771 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3772 {
3773         struct nfs4_unlockdata *calldata = data;
3774
3775         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3776                 return;
3777         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3778                 /* Note: exit _without_ running nfs4_locku_done */
3779                 task->tk_action = NULL;
3780                 return;
3781         }
3782         calldata->timestamp = jiffies;
3783         if (nfs4_setup_sequence(calldata->server->nfs_client,
3784                                 &calldata->arg.seq_args,
3785                                 &calldata->res.seq_res, 1, task))
3786                 return;
3787         rpc_call_start(task);
3788 }
3789
3790 static const struct rpc_call_ops nfs4_locku_ops = {
3791         .rpc_call_prepare = nfs4_locku_prepare,
3792         .rpc_call_done = nfs4_locku_done,
3793         .rpc_release = nfs4_locku_release_calldata,
3794 };
3795
3796 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3797                 struct nfs_open_context *ctx,
3798                 struct nfs4_lock_state *lsp,
3799                 struct nfs_seqid *seqid)
3800 {
3801         struct nfs4_unlockdata *data;
3802         struct rpc_message msg = {
3803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3804                 .rpc_cred = ctx->cred,
3805         };
3806         struct rpc_task_setup task_setup_data = {
3807                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3808                 .rpc_message = &msg,
3809                 .callback_ops = &nfs4_locku_ops,
3810                 .workqueue = nfsiod_workqueue,
3811                 .flags = RPC_TASK_ASYNC,
3812         };
3813
3814         /* Ensure this is an unlock - when canceling a lock, the
3815          * canceled lock is passed in, and it won't be an unlock.
3816          */
3817         fl->fl_type = F_UNLCK;
3818
3819         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3820         if (data == NULL) {
3821                 nfs_free_seqid(seqid);
3822                 return ERR_PTR(-ENOMEM);
3823         }
3824
3825         msg.rpc_argp = &data->arg,
3826         msg.rpc_resp = &data->res,
3827         task_setup_data.callback_data = data;
3828         return rpc_run_task(&task_setup_data);
3829 }
3830
3831 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3832 {
3833         struct nfs_inode *nfsi = NFS_I(state->inode);
3834         struct nfs_seqid *seqid;
3835         struct nfs4_lock_state *lsp;
3836         struct rpc_task *task;
3837         int status = 0;
3838         unsigned char fl_flags = request->fl_flags;
3839
3840         status = nfs4_set_lock_state(state, request);
3841         /* Unlock _before_ we do the RPC call */
3842         request->fl_flags |= FL_EXISTS;
3843         down_read(&nfsi->rwsem);
3844         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3845                 up_read(&nfsi->rwsem);
3846                 goto out;
3847         }
3848         up_read(&nfsi->rwsem);
3849         if (status != 0)
3850                 goto out;
3851         /* Is this a delegated lock? */
3852         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3853                 goto out;
3854         lsp = request->fl_u.nfs4_fl.owner;
3855         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3856         status = -ENOMEM;
3857         if (seqid == NULL)
3858                 goto out;
3859         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3860         status = PTR_ERR(task);
3861         if (IS_ERR(task))
3862                 goto out;
3863         status = nfs4_wait_for_completion_rpc_task(task);
3864         rpc_put_task(task);
3865 out:
3866         request->fl_flags = fl_flags;
3867         return status;
3868 }
3869
3870 struct nfs4_lockdata {
3871         struct nfs_lock_args arg;
3872         struct nfs_lock_res res;
3873         struct nfs4_lock_state *lsp;
3874         struct nfs_open_context *ctx;
3875         struct file_lock fl;
3876         unsigned long timestamp;
3877         int rpc_status;
3878         int cancelled;
3879         struct nfs_server *server;
3880 };
3881
3882 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3883                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3884 {
3885         struct nfs4_lockdata *p;
3886         struct inode *inode = lsp->ls_state->inode;
3887         struct nfs_server *server = NFS_SERVER(inode);
3888
3889         p = kzalloc(sizeof(*p), GFP_KERNEL);
3890         if (p == NULL)
3891                 return NULL;
3892
3893         p->arg.fh = NFS_FH(inode);
3894         p->arg.fl = &p->fl;
3895         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3896         if (p->arg.open_seqid == NULL)
3897                 goto out_free;
3898         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3899         if (p->arg.lock_seqid == NULL)
3900                 goto out_free_seqid;
3901         p->arg.lock_stateid = &lsp->ls_stateid;
3902         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3903         p->arg.lock_owner.id = lsp->ls_id.id;
3904         p->res.lock_seqid = p->arg.lock_seqid;
3905         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3906         p->lsp = lsp;
3907         p->server = server;
3908         atomic_inc(&lsp->ls_count);
3909         p->ctx = get_nfs_open_context(ctx);
3910         memcpy(&p->fl, fl, sizeof(p->fl));
3911         return p;
3912 out_free_seqid:
3913         nfs_free_seqid(p->arg.open_seqid);
3914 out_free:
3915         kfree(p);
3916         return NULL;
3917 }
3918
3919 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3920 {
3921         struct nfs4_lockdata *data = calldata;
3922         struct nfs4_state *state = data->lsp->ls_state;
3923
3924         dprintk("%s: begin!\n", __func__);
3925         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3926                 return;
3927         /* Do we need to do an open_to_lock_owner? */
3928         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3929                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3930                         return;
3931                 data->arg.open_stateid = &state->stateid;
3932                 data->arg.new_lock_owner = 1;
3933                 data->res.open_seqid = data->arg.open_seqid;
3934         } else
3935                 data->arg.new_lock_owner = 0;
3936         data->timestamp = jiffies;
3937         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3938                                 &data->res.seq_res, 1, task))
3939                 return;
3940         rpc_call_start(task);
3941         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3942 }
3943
3944 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3945 {
3946         struct nfs4_lockdata *data = calldata;
3947
3948         dprintk("%s: begin!\n", __func__);
3949
3950         nfs4_sequence_done(data->server, &data->res.seq_res,
3951                         task->tk_status);
3952
3953         data->rpc_status = task->tk_status;
3954         if (RPC_ASSASSINATED(task))
3955                 goto out;
3956         if (data->arg.new_lock_owner != 0) {
3957                 if (data->rpc_status == 0)
3958                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3959                 else
3960                         goto out;
3961         }
3962         if (data->rpc_status == 0) {
3963                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3964                                         sizeof(data->lsp->ls_stateid.data));
3965                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3966                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3967         }
3968 out:
3969         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3970 }
3971
3972 static void nfs4_lock_release(void *calldata)
3973 {
3974         struct nfs4_lockdata *data = calldata;
3975
3976         dprintk("%s: begin!\n", __func__);
3977         nfs_free_seqid(data->arg.open_seqid);
3978         if (data->cancelled != 0) {
3979                 struct rpc_task *task;
3980                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3981                                 data->arg.lock_seqid);
3982                 if (!IS_ERR(task))
3983                         rpc_put_task(task);
3984                 dprintk("%s: cancelling lock!\n", __func__);
3985         } else
3986                 nfs_free_seqid(data->arg.lock_seqid);
3987         nfs4_put_lock_state(data->lsp);
3988         put_nfs_open_context(data->ctx);
3989         kfree(data);
3990         dprintk("%s: done!\n", __func__);
3991 }
3992
3993 static const struct rpc_call_ops nfs4_lock_ops = {
3994         .rpc_call_prepare = nfs4_lock_prepare,
3995         .rpc_call_done = nfs4_lock_done,
3996         .rpc_release = nfs4_lock_release,
3997 };
3998
3999 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
4000 {
4001         struct nfs4_lockdata *data;
4002         struct rpc_task *task;
4003         struct rpc_message msg = {
4004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4005                 .rpc_cred = state->owner->so_cred,
4006         };
4007         struct rpc_task_setup task_setup_data = {
4008                 .rpc_client = NFS_CLIENT(state->inode),
4009                 .rpc_message = &msg,
4010                 .callback_ops = &nfs4_lock_ops,
4011                 .workqueue = nfsiod_workqueue,
4012                 .flags = RPC_TASK_ASYNC,
4013         };
4014         int ret;
4015
4016         dprintk("%s: begin!\n", __func__);
4017         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4018                         fl->fl_u.nfs4_fl.owner);
4019         if (data == NULL)
4020                 return -ENOMEM;
4021         if (IS_SETLKW(cmd))
4022                 data->arg.block = 1;
4023         if (reclaim != 0)
4024                 data->arg.reclaim = 1;
4025         msg.rpc_argp = &data->arg,
4026         msg.rpc_resp = &data->res,
4027         task_setup_data.callback_data = data;
4028         task = rpc_run_task(&task_setup_data);
4029         if (IS_ERR(task))
4030                 return PTR_ERR(task);
4031         ret = nfs4_wait_for_completion_rpc_task(task);
4032         if (ret == 0) {
4033                 ret = data->rpc_status;
4034         } else
4035                 data->cancelled = 1;
4036         rpc_put_task(task);
4037         dprintk("%s: done, ret = %d!\n", __func__, ret);
4038         return ret;
4039 }
4040
4041 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4042 {
4043         struct nfs_server *server = NFS_SERVER(state->inode);
4044         struct nfs4_exception exception = { };
4045         int err;
4046
4047         do {
4048                 /* Cache the lock if possible... */
4049                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4050                         return 0;
4051                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4052                 if (err != -NFS4ERR_DELAY)
4053                         break;
4054                 nfs4_handle_exception(server, err, &exception);
4055         } while (exception.retry);
4056         return err;
4057 }
4058
4059 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4060 {
4061         struct nfs_server *server = NFS_SERVER(state->inode);
4062         struct nfs4_exception exception = { };
4063         int err;
4064
4065         err = nfs4_set_lock_state(state, request);
4066         if (err != 0)
4067                 return err;
4068         do {
4069                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4070                         return 0;
4071                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4072                 switch (err) {
4073                 default:
4074                         goto out;
4075                 case -NFS4ERR_GRACE:
4076                 case -NFS4ERR_DELAY:
4077                         nfs4_handle_exception(server, err, &exception);
4078                         err = 0;
4079                 }
4080         } while (exception.retry);
4081 out:
4082         return err;
4083 }
4084
4085 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4086 {
4087         struct nfs_inode *nfsi = NFS_I(state->inode);
4088         unsigned char fl_flags = request->fl_flags;
4089         int status;
4090
4091         /* Is this a delegated open? */
4092         status = nfs4_set_lock_state(state, request);
4093         if (status != 0)
4094                 goto out;
4095         request->fl_flags |= FL_ACCESS;
4096         status = do_vfs_lock(request->fl_file, request);
4097         if (status < 0)
4098                 goto out;
4099         down_read(&nfsi->rwsem);
4100         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4101                 /* Yes: cache locks! */
4102                 /* ...but avoid races with delegation recall... */
4103                 request->fl_flags = fl_flags & ~FL_SLEEP;
4104                 status = do_vfs_lock(request->fl_file, request);
4105                 goto out_unlock;
4106         }
4107         status = _nfs4_do_setlk(state, cmd, request, 0);
4108         if (status != 0)
4109                 goto out_unlock;
4110         /* Note: we always want to sleep here! */
4111         request->fl_flags = fl_flags | FL_SLEEP;
4112         if (do_vfs_lock(request->fl_file, request) < 0)
4113                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4114 out_unlock:
4115         up_read(&nfsi->rwsem);
4116 out:
4117         request->fl_flags = fl_flags;
4118         return status;
4119 }
4120
4121 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4122 {
4123         struct nfs4_exception exception = { };
4124         int err;
4125
4126         do {
4127                 err = _nfs4_proc_setlk(state, cmd, request);
4128                 if (err == -NFS4ERR_DENIED)
4129                         err = -EAGAIN;
4130                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4131                                 err, &exception);
4132         } while (exception.retry);
4133         return err;
4134 }
4135
4136 static int
4137 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4138 {
4139         struct nfs_open_context *ctx;
4140         struct nfs4_state *state;
4141         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4142         int status;
4143
4144         /* verify open state */
4145         ctx = nfs_file_open_context(filp);
4146         state = ctx->state;
4147
4148         if (request->fl_start < 0 || request->fl_end < 0)
4149                 return -EINVAL;
4150
4151         if (IS_GETLK(cmd)) {
4152                 if (state != NULL)
4153                         return nfs4_proc_getlk(state, F_GETLK, request);
4154                 return 0;
4155         }
4156
4157         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4158                 return -EINVAL;
4159
4160         if (request->fl_type == F_UNLCK) {
4161                 if (state != NULL)
4162                         return nfs4_proc_unlck(state, cmd, request);
4163                 return 0;
4164         }
4165
4166         if (state == NULL)
4167                 return -ENOLCK;
4168         do {
4169                 status = nfs4_proc_setlk(state, cmd, request);
4170                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4171                         break;
4172                 timeout = nfs4_set_lock_task_retry(timeout);
4173                 status = -ERESTARTSYS;
4174                 if (signalled())
4175                         break;
4176         } while(status < 0);
4177         return status;
4178 }
4179
4180 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4181 {
4182         struct nfs_server *server = NFS_SERVER(state->inode);
4183         struct nfs4_exception exception = { };
4184         int err;
4185
4186         err = nfs4_set_lock_state(state, fl);
4187         if (err != 0)
4188                 goto out;
4189         do {
4190                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4191                 switch (err) {
4192                         default:
4193                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4194                                                 __func__, err);
4195                         case 0:
4196                         case -ESTALE:
4197                                 goto out;
4198                         case -NFS4ERR_EXPIRED:
4199                         case -NFS4ERR_STALE_CLIENTID:
4200                         case -NFS4ERR_STALE_STATEID:
4201                         case -NFS4ERR_BADSESSION:
4202                         case -NFS4ERR_BADSLOT:
4203                         case -NFS4ERR_BAD_HIGH_SLOT:
4204                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4205                         case -NFS4ERR_DEADSESSION:
4206                                 nfs4_schedule_state_recovery(server->nfs_client);
4207                                 goto out;
4208                         case -ERESTARTSYS:
4209                                 /*
4210                                  * The show must go on: exit, but mark the
4211                                  * stateid as needing recovery.
4212                                  */
4213                         case -NFS4ERR_ADMIN_REVOKED:
4214                         case -NFS4ERR_BAD_STATEID:
4215                         case -NFS4ERR_OPENMODE:
4216                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4217                                 err = 0;
4218                                 goto out;
4219                         case -ENOMEM:
4220                         case -NFS4ERR_DENIED:
4221                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4222                                 err = 0;
4223                                 goto out;
4224                         case -NFS4ERR_DELAY:
4225                                 break;
4226                 }
4227                 err = nfs4_handle_exception(server, err, &exception);
4228         } while (exception.retry);
4229 out:
4230         return err;
4231 }
4232
4233 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4234
4235 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4236                 size_t buflen, int flags)
4237 {
4238         struct inode *inode = dentry->d_inode;
4239
4240         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4241                 return -EOPNOTSUPP;
4242
4243         return nfs4_proc_set_acl(inode, buf, buflen);
4244 }
4245
4246 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4247  * and that's what we'll do for e.g. user attributes that haven't been set.
4248  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4249  * attributes in kernel-managed attribute namespaces. */
4250 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4251                 size_t buflen)
4252 {
4253         struct inode *inode = dentry->d_inode;
4254
4255         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4256                 return -EOPNOTSUPP;
4257
4258         return nfs4_proc_get_acl(inode, buf, buflen);
4259 }
4260
4261 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4262 {
4263         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4264
4265         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4266                 return 0;
4267         if (buf && buflen < len)
4268                 return -ERANGE;
4269         if (buf)
4270                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4271         return len;
4272 }
4273
4274 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4275 {
4276         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4277                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4278                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4279                 return;
4280
4281         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4282                 NFS_ATTR_FATTR_NLINK;
4283         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4284         fattr->nlink = 2;
4285 }
4286
4287 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4288                 struct nfs4_fs_locations *fs_locations, struct page *page)
4289 {
4290         struct nfs_server *server = NFS_SERVER(dir);
4291         u32 bitmask[2] = {
4292                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4293                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4294         };
4295         struct nfs4_fs_locations_arg args = {
4296                 .dir_fh = NFS_FH(dir),
4297                 .name = name,
4298                 .page = page,
4299                 .bitmask = bitmask,
4300         };
4301         struct nfs4_fs_locations_res res = {
4302                 .fs_locations = fs_locations,
4303         };
4304         struct rpc_message msg = {
4305                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4306                 .rpc_argp = &args,
4307                 .rpc_resp = &res,
4308         };
4309         int status;
4310
4311         dprintk("%s: start\n", __func__);
4312         nfs_fattr_init(&fs_locations->fattr);
4313         fs_locations->server = server;
4314         fs_locations->nlocations = 0;
4315         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4316         nfs_fixup_referral_attributes(&fs_locations->fattr);
4317         dprintk("%s: returned status = %d\n", __func__, status);
4318         return status;
4319 }
4320
4321 #ifdef CONFIG_NFS_V4_1
4322 /*
4323  * nfs4_proc_exchange_id()
4324  *
4325  * Since the clientid has expired, all compounds using sessions
4326  * associated with the stale clientid will be returning
4327  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4328  * be in some phase of session reset.
4329  */
4330 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4331 {
4332         nfs4_verifier verifier;
4333         struct nfs41_exchange_id_args args = {
4334                 .client = clp,
4335                 .flags = clp->cl_exchange_flags,
4336         };
4337         struct nfs41_exchange_id_res res = {
4338                 .client = clp,
4339         };
4340         int status;
4341         struct rpc_message msg = {
4342                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4343                 .rpc_argp = &args,
4344                 .rpc_resp = &res,
4345                 .rpc_cred = cred,
4346         };
4347         __be32 *p;
4348
4349         dprintk("--> %s\n", __func__);
4350         BUG_ON(clp == NULL);
4351
4352         /* Remove server-only flags */
4353         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4354
4355         p = (u32 *)verifier.data;
4356         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4357         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4358         args.verifier = &verifier;
4359
4360         while (1) {
4361                 args.id_len = scnprintf(args.id, sizeof(args.id),
4362                                         "%s/%s %u",
4363                                         clp->cl_ipaddr,
4364                                         rpc_peeraddr2str(clp->cl_rpcclient,
4365                                                          RPC_DISPLAY_ADDR),
4366                                         clp->cl_id_uniquifier);
4367
4368                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4369
4370                 if (status != NFS4ERR_CLID_INUSE)
4371                         break;
4372
4373                 if (signalled())
4374                         break;
4375
4376                 if (++clp->cl_id_uniquifier == 0)
4377                         break;
4378         }
4379
4380         dprintk("<-- %s status= %d\n", __func__, status);
4381         return status;
4382 }
4383
4384 struct nfs4_get_lease_time_data {
4385         struct nfs4_get_lease_time_args *args;
4386         struct nfs4_get_lease_time_res *res;
4387         struct nfs_client *clp;
4388 };
4389
4390 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4391                                         void *calldata)
4392 {
4393         int ret;
4394         struct nfs4_get_lease_time_data *data =
4395                         (struct nfs4_get_lease_time_data *)calldata;
4396
4397         dprintk("--> %s\n", __func__);
4398         /* just setup sequence, do not trigger session recovery
4399            since we're invoked within one */
4400         ret = nfs41_setup_sequence(data->clp->cl_session,
4401                                         &data->args->la_seq_args,
4402                                         &data->res->lr_seq_res, 0, task);
4403
4404         BUG_ON(ret == -EAGAIN);
4405         rpc_call_start(task);
4406         dprintk("<-- %s\n", __func__);
4407 }
4408
4409 /*
4410  * Called from nfs4_state_manager thread for session setup, so don't recover
4411  * from sequence operation or clientid errors.
4412  */
4413 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4414 {
4415         struct nfs4_get_lease_time_data *data =
4416                         (struct nfs4_get_lease_time_data *)calldata;
4417
4418         dprintk("--> %s\n", __func__);
4419         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4420         switch (task->tk_status) {
4421         case -NFS4ERR_DELAY:
4422         case -NFS4ERR_GRACE:
4423                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4424                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4425                 task->tk_status = 0;
4426                 nfs_restart_rpc(task, data->clp);
4427                 return;
4428         }
4429         dprintk("<-- %s\n", __func__);
4430 }
4431
4432 struct rpc_call_ops nfs4_get_lease_time_ops = {
4433         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4434         .rpc_call_done = nfs4_get_lease_time_done,
4435 };
4436
4437 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4438 {
4439         struct rpc_task *task;
4440         struct nfs4_get_lease_time_args args;
4441         struct nfs4_get_lease_time_res res = {
4442                 .lr_fsinfo = fsinfo,
4443         };
4444         struct nfs4_get_lease_time_data data = {
4445                 .args = &args,
4446                 .res = &res,
4447                 .clp = clp,
4448         };
4449         struct rpc_message msg = {
4450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4451                 .rpc_argp = &args,
4452                 .rpc_resp = &res,
4453         };
4454         struct rpc_task_setup task_setup = {
4455                 .rpc_client = clp->cl_rpcclient,
4456                 .rpc_message = &msg,
4457                 .callback_ops = &nfs4_get_lease_time_ops,
4458                 .callback_data = &data
4459         };
4460         int status;
4461
4462         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4463         dprintk("--> %s\n", __func__);
4464         task = rpc_run_task(&task_setup);
4465
4466         if (IS_ERR(task))
4467                 status = PTR_ERR(task);
4468         else {
4469                 status = task->tk_status;
4470                 rpc_put_task(task);
4471         }
4472         dprintk("<-- %s return %d\n", __func__, status);
4473
4474         return status;
4475 }
4476
4477 /*
4478  * Reset a slot table
4479  */
4480 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4481                 int old_max_slots, int ivalue)
4482 {
4483         int i;
4484         int ret = 0;
4485
4486         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4487
4488         /*
4489          * Until we have dynamic slot table adjustment, insist
4490          * upon the same slot table size
4491          */
4492         if (max_slots != old_max_slots) {
4493                 dprintk("%s reset slot table does't match old\n",
4494                         __func__);
4495                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4496                 goto out;
4497         }
4498         spin_lock(&tbl->slot_tbl_lock);
4499         for (i = 0; i < max_slots; ++i)
4500                 tbl->slots[i].seq_nr = ivalue;
4501         spin_unlock(&tbl->slot_tbl_lock);
4502         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4503                 tbl, tbl->slots, tbl->max_slots);
4504 out:
4505         dprintk("<-- %s: return %d\n", __func__, ret);
4506         return ret;
4507 }
4508
4509 /*
4510  * Reset the forechannel and backchannel slot tables
4511  */
4512 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4513 {
4514         int status;
4515
4516         status = nfs4_reset_slot_table(&session->fc_slot_table,
4517                         session->fc_attrs.max_reqs,
4518                         session->fc_slot_table.max_slots,
4519                         1);
4520         if (status)
4521                 return status;
4522
4523         status = nfs4_reset_slot_table(&session->bc_slot_table,
4524                         session->bc_attrs.max_reqs,
4525                         session->bc_slot_table.max_slots,
4526                         0);
4527         return status;
4528 }
4529
4530 /* Destroy the slot table */
4531 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4532 {
4533         if (session->fc_slot_table.slots != NULL) {
4534                 kfree(session->fc_slot_table.slots);
4535                 session->fc_slot_table.slots = NULL;
4536         }
4537         if (session->bc_slot_table.slots != NULL) {
4538                 kfree(session->bc_slot_table.slots);
4539                 session->bc_slot_table.slots = NULL;
4540         }
4541         return;
4542 }
4543
4544 /*
4545  * Initialize slot table
4546  */
4547 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4548                 int max_slots, int ivalue)
4549 {
4550         struct nfs4_slot *slot;
4551         int ret = -ENOMEM;
4552
4553         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4554
4555         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4556
4557         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4558         if (!slot)
4559                 goto out;
4560         ret = 0;
4561
4562         spin_lock(&tbl->slot_tbl_lock);
4563         tbl->max_slots = max_slots;
4564         tbl->slots = slot;
4565         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4566         spin_unlock(&tbl->slot_tbl_lock);
4567         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4568                 tbl, tbl->slots, tbl->max_slots);
4569 out:
4570         dprintk("<-- %s: return %d\n", __func__, ret);
4571         return ret;
4572 }
4573
4574 /*
4575  * Initialize the forechannel and backchannel tables
4576  */
4577 static int nfs4_init_slot_tables(struct nfs4_session *session)
4578 {
4579         struct nfs4_slot_table *tbl;
4580         int status = 0;
4581
4582         tbl = &session->fc_slot_table;
4583         if (tbl->slots == NULL) {
4584                 status = nfs4_init_slot_table(tbl,
4585                                 session->fc_attrs.max_reqs, 1);
4586                 if (status)
4587                         return status;
4588         }
4589
4590         tbl = &session->bc_slot_table;
4591         if (tbl->slots == NULL) {
4592                 status = nfs4_init_slot_table(tbl,
4593                                 session->bc_attrs.max_reqs, 0);
4594                 if (status)
4595                         nfs4_destroy_slot_tables(session);
4596         }
4597
4598         return status;
4599 }
4600
4601 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4602 {
4603         struct nfs4_session *session;
4604         struct nfs4_slot_table *tbl;
4605
4606         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4607         if (!session)
4608                 return NULL;
4609
4610         /*
4611          * The create session reply races with the server back
4612          * channel probe. Mark the client NFS_CS_SESSION_INITING
4613          * so that the client back channel can find the
4614          * nfs_client struct
4615          */
4616         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4617         init_completion(&session->complete);
4618
4619         tbl = &session->fc_slot_table;
4620         tbl->highest_used_slotid = -1;
4621         spin_lock_init(&tbl->slot_tbl_lock);
4622         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4623
4624         tbl = &session->bc_slot_table;
4625         tbl->highest_used_slotid = -1;
4626         spin_lock_init(&tbl->slot_tbl_lock);
4627         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4628
4629         session->clp = clp;
4630         return session;
4631 }
4632
4633 void nfs4_destroy_session(struct nfs4_session *session)
4634 {
4635         nfs4_proc_destroy_session(session);
4636         dprintk("%s Destroy backchannel for xprt %p\n",
4637                 __func__, session->clp->cl_rpcclient->cl_xprt);
4638         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4639                                 NFS41_BC_MIN_CALLBACKS);
4640         nfs4_destroy_slot_tables(session);
4641         kfree(session);
4642 }
4643
4644 /*
4645  * Initialize the values to be used by the client in CREATE_SESSION
4646  * If nfs4_init_session set the fore channel request and response sizes,
4647  * use them.
4648  *
4649  * Set the back channel max_resp_sz_cached to zero to force the client to
4650  * always set csa_cachethis to FALSE because the current implementation
4651  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4652  */
4653 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4654 {
4655         struct nfs4_session *session = args->client->cl_session;
4656         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4657                      mxresp_sz = session->fc_attrs.max_resp_sz;
4658
4659         if (mxrqst_sz == 0)
4660                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4661         if (mxresp_sz == 0)
4662                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4663         /* Fore channel attributes */
4664         args->fc_attrs.headerpadsz = 0;
4665         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4666         args->fc_attrs.max_resp_sz = mxresp_sz;
4667         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4668         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4669         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4670
4671         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4672                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4673                 __func__,
4674                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4675                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4676                 args->fc_attrs.max_reqs);
4677
4678         /* Back channel attributes */
4679         args->bc_attrs.headerpadsz = 0;
4680         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4681         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4682         args->bc_attrs.max_resp_sz_cached = 0;
4683         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4684         args->bc_attrs.max_reqs = 1;
4685
4686         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4687                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4688                 __func__,
4689                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4690                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4691                 args->bc_attrs.max_reqs);
4692 }
4693
4694 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4695 {
4696         if (rcvd <= sent)
4697                 return 0;
4698         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4699                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4700         return -EINVAL;
4701 }
4702
4703 #define _verify_fore_channel_attr(_name_) \
4704         _verify_channel_attr("fore", #_name_, \
4705                              args->fc_attrs._name_, \
4706                              session->fc_attrs._name_)
4707
4708 #define _verify_back_channel_attr(_name_) \
4709         _verify_channel_attr("back", #_name_, \
4710                              args->bc_attrs._name_, \
4711                              session->bc_attrs._name_)
4712
4713 /*
4714  * The server is not allowed to increase the fore channel header pad size,
4715  * maximum response size, or maximum number of operations.
4716  *
4717  * The back channel attributes are only negotiatied down: We send what the
4718  * (back channel) server insists upon.
4719  */
4720 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4721                                      struct nfs4_session *session)
4722 {
4723         int ret = 0;
4724
4725         ret |= _verify_fore_channel_attr(headerpadsz);
4726         ret |= _verify_fore_channel_attr(max_resp_sz);
4727         ret |= _verify_fore_channel_attr(max_ops);
4728
4729         ret |= _verify_back_channel_attr(headerpadsz);
4730         ret |= _verify_back_channel_attr(max_rqst_sz);
4731         ret |= _verify_back_channel_attr(max_resp_sz);
4732         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4733         ret |= _verify_back_channel_attr(max_ops);
4734         ret |= _verify_back_channel_attr(max_reqs);
4735
4736         return ret;
4737 }
4738
4739 static int _nfs4_proc_create_session(struct nfs_client *clp)
4740 {
4741         struct nfs4_session *session = clp->cl_session;
4742         struct nfs41_create_session_args args = {
4743                 .client = clp,
4744                 .cb_program = NFS4_CALLBACK,
4745         };
4746         struct nfs41_create_session_res res = {
4747                 .client = clp,
4748         };
4749         struct rpc_message msg = {
4750                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4751                 .rpc_argp = &args,
4752                 .rpc_resp = &res,
4753         };
4754         int status;
4755
4756         nfs4_init_channel_attrs(&args);
4757         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4758
4759         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4760
4761         if (!status)
4762                 /* Verify the session's negotiated channel_attrs values */
4763                 status = nfs4_verify_channel_attrs(&args, session);
4764         if (!status) {
4765                 /* Increment the clientid slot sequence id */
4766                 clp->cl_seqid++;
4767         }
4768
4769         return status;
4770 }
4771
4772 /*
4773  * Issues a CREATE_SESSION operation to the server.
4774  * It is the responsibility of the caller to verify the session is
4775  * expired before calling this routine.
4776  */
4777 int nfs4_proc_create_session(struct nfs_client *clp)
4778 {
4779         int status;
4780         unsigned *ptr;
4781         struct nfs4_session *session = clp->cl_session;
4782
4783         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4784
4785         status = _nfs4_proc_create_session(clp);
4786         if (status)
4787                 goto out;
4788
4789         /* Init and reset the fore channel */
4790         status = nfs4_init_slot_tables(session);
4791         dprintk("slot table initialization returned %d\n", status);
4792         if (status)
4793                 goto out;
4794         status = nfs4_reset_slot_tables(session);
4795         dprintk("slot table reset returned %d\n", status);
4796         if (status)
4797                 goto out;
4798
4799         ptr = (unsigned *)&session->sess_id.data[0];
4800         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4801                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4802 out:
4803         dprintk("<-- %s\n", __func__);
4804         return status;
4805 }
4806
4807 /*
4808  * Issue the over-the-wire RPC DESTROY_SESSION.
4809  * The caller must serialize access to this routine.
4810  */
4811 int nfs4_proc_destroy_session(struct nfs4_session *session)
4812 {
4813         int status = 0;
4814         struct rpc_message msg;
4815
4816         dprintk("--> nfs4_proc_destroy_session\n");
4817
4818         /* session is still being setup */
4819         if (session->clp->cl_cons_state != NFS_CS_READY)
4820                 return status;
4821
4822         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4823         msg.rpc_argp = session;
4824         msg.rpc_resp = NULL;
4825         msg.rpc_cred = NULL;
4826         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4827
4828         if (status)
4829                 printk(KERN_WARNING
4830                         "Got error %d from the server on DESTROY_SESSION. "
4831                         "Session has been destroyed regardless...\n", status);
4832
4833         dprintk("<-- nfs4_proc_destroy_session\n");
4834         return status;
4835 }
4836
4837 int nfs4_init_session(struct nfs_server *server)
4838 {
4839         struct nfs_client *clp = server->nfs_client;
4840         struct nfs4_session *session;
4841         int ret;
4842
4843         if (!nfs4_has_session(clp))
4844                 return 0;
4845
4846         session = clp->cl_session;
4847         session->fc_attrs.max_rqst_sz = server->wsize + nfs41_maxwrite_overhead;
4848         session->fc_attrs.max_resp_sz = server->rsize + nfs41_maxread_overhead;
4849
4850         ret = nfs4_recover_expired_lease(server);
4851         if (!ret)
4852                 ret = nfs4_check_client_ready(clp);
4853         return ret;
4854 }
4855
4856 /*
4857  * Renew the cl_session lease.
4858  */
4859 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4860 {
4861         struct nfs4_sequence_args args;
4862         struct nfs4_sequence_res res;
4863
4864         struct rpc_message msg = {
4865                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4866                 .rpc_argp = &args,
4867                 .rpc_resp = &res,
4868                 .rpc_cred = cred,
4869         };
4870
4871         args.sa_cache_this = 0;
4872
4873         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4874                                        &res, 0);
4875 }
4876
4877 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4878 {
4879         struct nfs_client *clp = (struct nfs_client *)data;
4880
4881         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4882
4883         if (task->tk_status < 0) {
4884                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4885
4886                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4887                                                                 == -EAGAIN) {
4888                         nfs_restart_rpc(task, clp);
4889                         return;
4890                 }
4891         }
4892         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4893
4894         kfree(task->tk_msg.rpc_argp);
4895         kfree(task->tk_msg.rpc_resp);
4896
4897         dprintk("<-- %s\n", __func__);
4898 }
4899
4900 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4901 {
4902         struct nfs_client *clp;
4903         struct nfs4_sequence_args *args;
4904         struct nfs4_sequence_res *res;
4905
4906         clp = (struct nfs_client *)data;
4907         args = task->tk_msg.rpc_argp;
4908         res = task->tk_msg.rpc_resp;
4909
4910         if (nfs4_setup_sequence(clp, args, res, 0, task))
4911                 return;
4912         rpc_call_start(task);
4913 }
4914
4915 static const struct rpc_call_ops nfs41_sequence_ops = {
4916         .rpc_call_done = nfs41_sequence_call_done,
4917         .rpc_call_prepare = nfs41_sequence_prepare,
4918 };
4919
4920 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4921                                      struct rpc_cred *cred)
4922 {
4923         struct nfs4_sequence_args *args;
4924         struct nfs4_sequence_res *res;
4925         struct rpc_message msg = {
4926                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4927                 .rpc_cred = cred,
4928         };
4929
4930         args = kzalloc(sizeof(*args), GFP_KERNEL);
4931         if (!args)
4932                 return -ENOMEM;
4933         res = kzalloc(sizeof(*res), GFP_KERNEL);
4934         if (!res) {
4935                 kfree(args);
4936                 return -ENOMEM;
4937         }
4938         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4939         msg.rpc_argp = args;
4940         msg.rpc_resp = res;
4941
4942         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4943                               &nfs41_sequence_ops, (void *)clp);
4944 }
4945
4946 struct nfs4_reclaim_complete_data {
4947         struct nfs_client *clp;
4948         struct nfs41_reclaim_complete_args arg;
4949         struct nfs41_reclaim_complete_res res;
4950 };
4951
4952 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
4953 {
4954         struct nfs4_reclaim_complete_data *calldata = data;
4955
4956         if (nfs4_setup_sequence(calldata->clp, &calldata->arg.seq_args,
4957                                 &calldata->res.seq_res, 0, task))
4958                 return;
4959
4960         rpc_call_start(task);
4961 }
4962
4963 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
4964 {
4965         struct nfs4_reclaim_complete_data *calldata = data;
4966         struct nfs_client *clp = calldata->clp;
4967         struct nfs4_sequence_res *res = &calldata->res.seq_res;
4968
4969         dprintk("--> %s\n", __func__);
4970         nfs41_sequence_done(clp, res, task->tk_status);
4971         switch (task->tk_status) {
4972         case 0:
4973         case -NFS4ERR_COMPLETE_ALREADY:
4974                 break;
4975         case -NFS4ERR_BADSESSION:
4976         case -NFS4ERR_DEADSESSION:
4977                 /*
4978                  * Handle the session error, but do not retry the operation, as
4979                  * we have no way of telling whether the clientid had to be
4980                  * reset before we got our reply.  If reset, a new wave of
4981                  * reclaim operations will follow, containing their own reclaim
4982                  * complete.  We don't want our retry to get on the way of
4983                  * recovery by incorrectly indicating to the server that we're
4984                  * done reclaiming state since the process had to be restarted.
4985                  */
4986                 _nfs4_async_handle_error(task, NULL, clp, NULL);
4987                 break;
4988         default:
4989                 if (_nfs4_async_handle_error(
4990                                 task, NULL, clp, NULL) == -EAGAIN) {
4991                         rpc_restart_call_prepare(task);
4992                         return;
4993                 }
4994         }
4995
4996         dprintk("<-- %s\n", __func__);
4997 }
4998
4999 static void nfs4_free_reclaim_complete_data(void *data)
5000 {
5001         struct nfs4_reclaim_complete_data *calldata = data;
5002
5003         kfree(calldata);
5004 }
5005
5006 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5007         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5008         .rpc_call_done = nfs4_reclaim_complete_done,
5009         .rpc_release = nfs4_free_reclaim_complete_data,
5010 };
5011
5012 /*
5013  * Issue a global reclaim complete.
5014  */
5015 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5016 {
5017         struct nfs4_reclaim_complete_data *calldata;
5018         struct rpc_task *task;
5019         struct rpc_message msg = {
5020                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5021         };
5022         struct rpc_task_setup task_setup_data = {
5023                 .rpc_client = clp->cl_rpcclient,
5024                 .rpc_message = &msg,
5025                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5026                 .flags = RPC_TASK_ASYNC,
5027         };
5028         int status = -ENOMEM;
5029
5030         dprintk("--> %s\n", __func__);
5031         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
5032         if (calldata == NULL)
5033                 goto out;
5034         calldata->clp = clp;
5035         calldata->arg.one_fs = 0;
5036         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5037
5038         msg.rpc_argp = &calldata->arg;
5039         msg.rpc_resp = &calldata->res;
5040         task_setup_data.callback_data = calldata;
5041         task = rpc_run_task(&task_setup_data);
5042         if (IS_ERR(task))
5043                 status = PTR_ERR(task);
5044         rpc_put_task(task);
5045 out:
5046         dprintk("<-- %s status=%d\n", __func__, status);
5047         return status;
5048 }
5049 #endif /* CONFIG_NFS_V4_1 */
5050
5051 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5052         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5053         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5054         .recover_open   = nfs4_open_reclaim,
5055         .recover_lock   = nfs4_lock_reclaim,
5056         .establish_clid = nfs4_init_clientid,
5057         .get_clid_cred  = nfs4_get_setclientid_cred,
5058 };
5059
5060 #if defined(CONFIG_NFS_V4_1)
5061 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5062         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5063         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5064         .recover_open   = nfs4_open_reclaim,
5065         .recover_lock   = nfs4_lock_reclaim,
5066         .establish_clid = nfs41_init_clientid,
5067         .get_clid_cred  = nfs4_get_exchange_id_cred,
5068         .reclaim_complete = nfs41_proc_reclaim_complete,
5069 };
5070 #endif /* CONFIG_NFS_V4_1 */
5071
5072 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5073         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5074         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5075         .recover_open   = nfs4_open_expired,
5076         .recover_lock   = nfs4_lock_expired,
5077         .establish_clid = nfs4_init_clientid,
5078         .get_clid_cred  = nfs4_get_setclientid_cred,
5079 };
5080
5081 #if defined(CONFIG_NFS_V4_1)
5082 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5083         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5084         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5085         .recover_open   = nfs4_open_expired,
5086         .recover_lock   = nfs4_lock_expired,
5087         .establish_clid = nfs41_init_clientid,
5088         .get_clid_cred  = nfs4_get_exchange_id_cred,
5089 };
5090 #endif /* CONFIG_NFS_V4_1 */
5091
5092 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5093         .sched_state_renewal = nfs4_proc_async_renew,
5094         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5095         .renew_lease = nfs4_proc_renew,
5096 };
5097
5098 #if defined(CONFIG_NFS_V4_1)
5099 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5100         .sched_state_renewal = nfs41_proc_async_sequence,
5101         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5102         .renew_lease = nfs4_proc_sequence,
5103 };
5104 #endif
5105
5106 /*
5107  * Per minor version reboot and network partition recovery ops
5108  */
5109
5110 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5111         &nfs40_reboot_recovery_ops,
5112 #if defined(CONFIG_NFS_V4_1)
5113         &nfs41_reboot_recovery_ops,
5114 #endif
5115 };
5116
5117 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5118         &nfs40_nograce_recovery_ops,
5119 #if defined(CONFIG_NFS_V4_1)
5120         &nfs41_nograce_recovery_ops,
5121 #endif
5122 };
5123
5124 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5125         &nfs40_state_renewal_ops,
5126 #if defined(CONFIG_NFS_V4_1)
5127         &nfs41_state_renewal_ops,
5128 #endif
5129 };
5130
5131 static const struct inode_operations nfs4_file_inode_operations = {
5132         .permission     = nfs_permission,
5133         .getattr        = nfs_getattr,
5134         .setattr        = nfs_setattr,
5135         .getxattr       = nfs4_getxattr,
5136         .setxattr       = nfs4_setxattr,
5137         .listxattr      = nfs4_listxattr,
5138 };
5139
5140 const struct nfs_rpc_ops nfs_v4_clientops = {
5141         .version        = 4,                    /* protocol version */
5142         .dentry_ops     = &nfs4_dentry_operations,
5143         .dir_inode_ops  = &nfs4_dir_inode_operations,
5144         .file_inode_ops = &nfs4_file_inode_operations,
5145         .getroot        = nfs4_proc_get_root,
5146         .getattr        = nfs4_proc_getattr,
5147         .setattr        = nfs4_proc_setattr,
5148         .lookupfh       = nfs4_proc_lookupfh,
5149         .lookup         = nfs4_proc_lookup,
5150         .access         = nfs4_proc_access,
5151         .readlink       = nfs4_proc_readlink,
5152         .create         = nfs4_proc_create,
5153         .remove         = nfs4_proc_remove,
5154         .unlink_setup   = nfs4_proc_unlink_setup,
5155         .unlink_done    = nfs4_proc_unlink_done,
5156         .rename         = nfs4_proc_rename,
5157         .link           = nfs4_proc_link,
5158         .symlink        = nfs4_proc_symlink,
5159         .mkdir          = nfs4_proc_mkdir,
5160         .rmdir          = nfs4_proc_remove,
5161         .readdir        = nfs4_proc_readdir,
5162         .mknod          = nfs4_proc_mknod,
5163         .statfs         = nfs4_proc_statfs,
5164         .fsinfo         = nfs4_proc_fsinfo,
5165         .pathconf       = nfs4_proc_pathconf,
5166         .set_capabilities = nfs4_server_capabilities,
5167         .decode_dirent  = nfs4_decode_dirent,
5168         .read_setup     = nfs4_proc_read_setup,
5169         .read_done      = nfs4_read_done,
5170         .write_setup    = nfs4_proc_write_setup,
5171         .write_done     = nfs4_write_done,
5172         .commit_setup   = nfs4_proc_commit_setup,
5173         .commit_done    = nfs4_commit_done,
5174         .lock           = nfs4_proc_lock,
5175         .clear_acl_cache = nfs4_zap_acl_attr,
5176         .close_context  = nfs4_close_context,
5177 };
5178
5179 /*
5180  * Local variables:
5181  *  c-basic-offset: 8
5182  * End:
5183  */