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/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  65
  66 struct nfs4_opendata;
  67 static int _nfs4_proc_open(struct nfs4_opendata *data);
  68 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  69 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  70 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  71 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  72
  73 /* Prevent leaks of NFSv4 errors into userland */
  74 static int nfs4_map_errors(int err)
  75 {
  76         if (err < -1000) {
  77                 dprintk("%s could not handle NFSv4 error %d\n",
  78                                 __func__, -err);
  79                 return -EIO;
  80         }
  81         return err;
  82 }
  83
  84 /*
  85  * This is our standard bitmap for GETATTR requests.
  86  */
  87 const u32 nfs4_fattr_bitmap[2] = {
  88         FATTR4_WORD0_TYPE
  89         | FATTR4_WORD0_CHANGE
  90         | FATTR4_WORD0_SIZE
  91         | FATTR4_WORD0_FSID
  92         | FATTR4_WORD0_FILEID,
  93         FATTR4_WORD1_MODE
  94         | FATTR4_WORD1_NUMLINKS
  95         | FATTR4_WORD1_OWNER
  96         | FATTR4_WORD1_OWNER_GROUP
  97         | FATTR4_WORD1_RAWDEV
  98         | FATTR4_WORD1_SPACE_USED
  99         | FATTR4_WORD1_TIME_ACCESS
 100         | FATTR4_WORD1_TIME_METADATA
 101         | FATTR4_WORD1_TIME_MODIFY
 102 };
 103
 104 const u32 nfs4_statfs_bitmap[2] = {
 105         FATTR4_WORD0_FILES_AVAIL
 106         | FATTR4_WORD0_FILES_FREE
 107         | FATTR4_WORD0_FILES_TOTAL,
 108         FATTR4_WORD1_SPACE_AVAIL
 109         | FATTR4_WORD1_SPACE_FREE
 110         | FATTR4_WORD1_SPACE_TOTAL
 111 };
 112
 113 const u32 nfs4_pathconf_bitmap[2] = {
 114         FATTR4_WORD0_MAXLINK
 115         | FATTR4_WORD0_MAXNAME,
 116         0
 117 };
 118
 119 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 120                         | FATTR4_WORD0_MAXREAD
 121                         | FATTR4_WORD0_MAXWRITE
 122                         | FATTR4_WORD0_LEASE_TIME,
 123                         0
 124 };
 125
 126 const u32 nfs4_fs_locations_bitmap[2] = {
 127         FATTR4_WORD0_TYPE
 128         | FATTR4_WORD0_CHANGE
 129         | FATTR4_WORD0_SIZE
 130         | FATTR4_WORD0_FSID
 131         | FATTR4_WORD0_FILEID
 132         | FATTR4_WORD0_FS_LOCATIONS,
 133         FATTR4_WORD1_MODE
 134         | FATTR4_WORD1_NUMLINKS
 135         | FATTR4_WORD1_OWNER
 136         | FATTR4_WORD1_OWNER_GROUP
 137         | FATTR4_WORD1_RAWDEV
 138         | FATTR4_WORD1_SPACE_USED
 139         | FATTR4_WORD1_TIME_ACCESS
 140         | FATTR4_WORD1_TIME_METADATA
 141         | FATTR4_WORD1_TIME_MODIFY
 142         | FATTR4_WORD1_MOUNTED_ON_FILEID
 143 };
 144
 145 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 146                 struct nfs4_readdir_arg *readdir)
 147 {
 148         __be32 *start, *p;
 149
 150         BUG_ON(readdir->count < 80);
 151         if (cookie > 2) {
 152                 readdir->cookie = cookie;
 153                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 154                 return;
 155         }
 156
 157         readdir->cookie = 0;
 158         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 159         if (cookie == 2)
 160                 return;
 161
 162         /*
 163          * NFSv4 servers do not return entries for '.' and '..'
 164          * Therefore, we fake these entries here.  We let '.'
 165          * have cookie 0 and '..' have cookie 1.  Note that
 166          * when talking to the server, we always send cookie 0
 167          * instead of 1 or 2.
 168          */
 169         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 170
 171         if (cookie == 0) {
 172                 *p++ = xdr_one;                                  /* next */
 173                 *p++ = xdr_zero;                   /* cookie, first word */
 174                 *p++ = xdr_one;                   /* cookie, second word */
 175                 *p++ = xdr_one;                             /* entry len */
 176                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 177                 p++;
 178                 *p++ = xdr_one;                         /* bitmap length */
 179                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 180                 *p++ = htonl(8);              /* attribute buffer length */
 181                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 182         }
 183
 184         *p++ = xdr_one;                                  /* next */
 185         *p++ = xdr_zero;                   /* cookie, first word */
 186         *p++ = xdr_two;                   /* cookie, second word */
 187         *p++ = xdr_two;                             /* entry len */
 188         memcpy(p, "..\0\0", 4);                         /* entry */
 189         p++;
 190         *p++ = xdr_one;                         /* bitmap length */
 191         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 192         *p++ = htonl(8);              /* attribute buffer length */
 193         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 194
 195         readdir->pgbase = (char *)p - (char *)start;
 196         readdir->count -= readdir->pgbase;
 197         kunmap_atomic(start, KM_USER0);
 198 }
 199
 200 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 201 {
 202         int res;
 203
 204         might_sleep();
 205
 206         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 207                         nfs_wait_bit_killable, TASK_KILLABLE);
 208         return res;
 209 }
 210
 211 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 212 {
 213         int res = 0;
 214
 215         might_sleep();
 216
 217         if (*timeout <= 0)
 218                 *timeout = NFS4_POLL_RETRY_MIN;
 219         if (*timeout > NFS4_POLL_RETRY_MAX)
 220                 *timeout = NFS4_POLL_RETRY_MAX;
 221         schedule_timeout_killable(*timeout);
 222         if (fatal_signal_pending(current))
 223                 res = -ERESTARTSYS;
 224         *timeout <<= 1;
 225         return res;
 226 }
 227
 228 /* This is the error handling routine for processes that are allowed
 229  * to sleep.
 230  */
 231 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 232 {
 233         struct nfs_client *clp = server->nfs_client;
 234         struct nfs4_state *state = exception->state;
 235         int ret = errorcode;
 236
 237         exception->retry = 0;
 238         switch(errorcode) {
 239                 case 0:
 240                         return 0;
 241                 case -NFS4ERR_ADMIN_REVOKED:
 242                 case -NFS4ERR_BAD_STATEID:
 243                 case -NFS4ERR_OPENMODE:
 244                         if (state == NULL)
 245                                 break;
 246                         nfs4_state_mark_reclaim_nograce(clp, state);
 247                 case -NFS4ERR_STALE_CLIENTID:
 248                 case -NFS4ERR_STALE_STATEID:
 249                 case -NFS4ERR_EXPIRED:
 250                         nfs4_schedule_state_recovery(clp);
 251                         ret = nfs4_wait_clnt_recover(clp);
 252                         if (ret == 0)
 253                                 exception->retry = 1;
 254 #if !defined(CONFIG_NFS_V4_1)
 255                         break;
 256 #else /* !defined(CONFIG_NFS_V4_1) */
 257                         if (!nfs4_has_session(server->nfs_client))
 258                                 break;
 259                         /* FALLTHROUGH */
 260                 case -NFS4ERR_BADSESSION:
 261                 case -NFS4ERR_BADSLOT:
 262                 case -NFS4ERR_BAD_HIGH_SLOT:
 263                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 264                 case -NFS4ERR_DEADSESSION:
 265                 case -NFS4ERR_SEQ_FALSE_RETRY:
 266                 case -NFS4ERR_SEQ_MISORDERED:
 267                         dprintk("%s ERROR: %d Reset session\n", __func__,
 268                                 errorcode);
 269                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
 270                         exception->retry = 1;
 271                         /* FALLTHROUGH */
 272 #endif /* !defined(CONFIG_NFS_V4_1) */
 273                 case -NFS4ERR_FILE_OPEN:
 274                 case -NFS4ERR_GRACE:
 275                 case -NFS4ERR_DELAY:
 276                         ret = nfs4_delay(server->client, &exception->timeout);
 277                         if (ret != 0)
 278                                 break;
 279                 case -NFS4ERR_OLD_STATEID:
 280                         exception->retry = 1;
 281         }
 282         /* We failed to handle the error */
 283         return nfs4_map_errors(ret);
 284 }
 285
 286
 287 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 288 {
 289         struct nfs_client *clp = server->nfs_client;
 290         spin_lock(&clp->cl_lock);
 291         if (time_before(clp->cl_last_renewal,timestamp))
 292                 clp->cl_last_renewal = timestamp;
 293         spin_unlock(&clp->cl_lock);
 294 }
 295
 296 #if defined(CONFIG_NFS_V4_1)
 297
 298 /*
 299  * nfs4_free_slot - free a slot and efficiently update slot table.
 300  *
 301  * freeing a slot is trivially done by clearing its respective bit
 302  * in the bitmap.
 303  * If the freed slotid equals highest_used_slotid we want to update it
 304  * so that the server would be able to size down the slot table if needed,
 305  * otherwise we know that the highest_used_slotid is still in use.
 306  * When updating highest_used_slotid there may be "holes" in the bitmap
 307  * so we need to scan down from highest_used_slotid to 0 looking for the now
 308  * highest slotid in use.
 309  * If none found, highest_used_slotid is set to -1.
 310  */
 311 static void
 312 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 313 {
 314         int slotid = free_slotid;
 315
 316         spin_lock(&tbl->slot_tbl_lock);
 317         /* clear used bit in bitmap */
 318         __clear_bit(slotid, tbl->used_slots);
 319
 320         /* update highest_used_slotid when it is freed */
 321         if (slotid == tbl->highest_used_slotid) {
 322                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 323                 if (slotid >= 0 && slotid < tbl->max_slots)
 324                         tbl->highest_used_slotid = slotid;
 325                 else
 326                         tbl->highest_used_slotid = -1;
 327         }
 328         rpc_wake_up_next(&tbl->slot_tbl_waitq);
 329         spin_unlock(&tbl->slot_tbl_lock);
 330         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 331                 free_slotid, tbl->highest_used_slotid);
 332 }
 333
 334 void nfs41_sequence_free_slot(const struct nfs_client *clp,
 335                               struct nfs4_sequence_res *res)
 336 {
 337         struct nfs4_slot_table *tbl;
 338
 339         if (!nfs4_has_session(clp)) {
 340                 dprintk("%s: No session\n", __func__);
 341                 return;
 342         }
 343         tbl = &clp->cl_session->fc_slot_table;
 344         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 345                 dprintk("%s: No slot\n", __func__);
 346                 /* just wake up the next guy waiting since
 347                  * we may have not consumed a slot after all */
 348                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 349                 return;
 350         }
 351         nfs4_free_slot(tbl, res->sr_slotid);
 352         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 353 }
 354
 355 static void nfs41_sequence_done(struct nfs_client *clp,
 356                                 struct nfs4_sequence_res *res,
 357                                 int rpc_status)
 358 {
 359         unsigned long timestamp;
 360         struct nfs4_slot_table *tbl;
 361         struct nfs4_slot *slot;
 362
 363         /*
 364          * sr_status remains 1 if an RPC level error occurred. The server
 365          * may or may not have processed the sequence operation..
 366          * Proceed as if the server received and processed the sequence
 367          * operation.
 368          */
 369         if (res->sr_status == 1)
 370                 res->sr_status = NFS_OK;
 371
 372         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 373         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 374                 goto out;
 375
 376         tbl = &clp->cl_session->fc_slot_table;
 377         slot = tbl->slots + res->sr_slotid;
 378
 379         if (res->sr_status == 0) {
 380                 /* Update the slot's sequence and clientid lease timer */
 381                 ++slot->seq_nr;
 382                 timestamp = res->sr_renewal_time;
 383                 spin_lock(&clp->cl_lock);
 384                 if (time_before(clp->cl_last_renewal, timestamp))
 385                         clp->cl_last_renewal = timestamp;
 386                 spin_unlock(&clp->cl_lock);
 387                 return;
 388         }
 389 out:
 390         /* The session may be reset by one of the error handlers. */
 391         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 392         nfs41_sequence_free_slot(clp, res);
 393 }
 394
 395 /*
 396  * nfs4_find_slot - efficiently look for a free slot
 397  *
 398  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 399  * If found, we mark the slot as used, update the highest_used_slotid,
 400  * and respectively set up the sequence operation args.
 401  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 402  *
 403  * Note: must be called with under the slot_tbl_lock.
 404  */
 405 static u8
 406 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
 407 {
 408         int slotid;
 409         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 410         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 411
 412         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 413                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 414                 tbl->max_slots);
 415         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 416         if (slotid >= tbl->max_slots)
 417                 goto out;
 418         __set_bit(slotid, tbl->used_slots);
 419         if (slotid > tbl->highest_used_slotid)
 420                 tbl->highest_used_slotid = slotid;
 421         ret_id = slotid;
 422 out:
 423         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 424                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 425         return ret_id;
 426 }
 427
 428 static int nfs4_recover_session(struct nfs4_session *session)
 429 {
 430         struct nfs_client *clp = session->clp;
 431         unsigned int loop;
 432         int ret;
 433
 434         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
 435                 ret = nfs4_wait_clnt_recover(clp);
 436                 if (ret != 0)
 437                         break;
 438                 if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
 439                         break;
 440                 nfs4_schedule_state_manager(clp);
 441                 ret = -EIO;
 442         }
 443         return ret;
 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         int status = 0;
 455         u8 slotid;
 456
 457         dprintk("--> %s\n", __func__);
 458         /* slot already allocated? */
 459         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 460                 return 0;
 461
 462         memset(res, 0, sizeof(*res));
 463         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 464         tbl = &session->fc_slot_table;
 465
 466         spin_lock(&tbl->slot_tbl_lock);
 467         if (test_bit(NFS4CLNT_SESSION_SETUP, &session->clp->cl_state)) {
 468                 if (tbl->highest_used_slotid != -1) {
 469                         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 470                         spin_unlock(&tbl->slot_tbl_lock);
 471                         dprintk("<-- %s: Session reset: draining\n", __func__);
 472                         return -EAGAIN;
 473                 }
 474
 475                 /* The slot table is empty; start the reset thread */
 476                 dprintk("%s Session Reset\n", __func__);
 477                 spin_unlock(&tbl->slot_tbl_lock);
 478                 status = nfs4_recover_session(session);
 479                 if (status)
 480                         return status;
 481                 spin_lock(&tbl->slot_tbl_lock);
 482         }
 483
 484         slotid = nfs4_find_slot(tbl, task);
 485         if (slotid == NFS4_MAX_SLOT_TABLE) {
 486                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 487                 spin_unlock(&tbl->slot_tbl_lock);
 488                 dprintk("<-- %s: no free slots\n", __func__);
 489                 return -EAGAIN;
 490         }
 491         spin_unlock(&tbl->slot_tbl_lock);
 492
 493         slot = tbl->slots + slotid;
 494         args->sa_session = session;
 495         args->sa_slotid = slotid;
 496         args->sa_cache_this = cache_reply;
 497
 498         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 499
 500         res->sr_session = session;
 501         res->sr_slotid = slotid;
 502         res->sr_renewal_time = jiffies;
 503         /*
 504          * sr_status is only set in decode_sequence, and so will remain
 505          * set to 1 if an rpc level failure occurs.
 506          */
 507         res->sr_status = 1;
 508         return 0;
 509 }
 510
 511 int nfs4_setup_sequence(struct nfs_client *clp,
 512                         struct nfs4_sequence_args *args,
 513                         struct nfs4_sequence_res *res,
 514                         int cache_reply,
 515                         struct rpc_task *task)
 516 {
 517         int ret = 0;
 518
 519         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 520                 __func__, clp, clp->cl_session, res->sr_slotid);
 521
 522         if (!nfs4_has_session(clp))
 523                 goto out;
 524         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
 525                                    task);
 526         if (ret != -EAGAIN) {
 527                 /* terminate rpc task */
 528                 task->tk_status = ret;
 529                 task->tk_action = NULL;
 530         }
 531 out:
 532         dprintk("<-- %s status=%d\n", __func__, ret);
 533         return ret;
 534 }
 535
 536 struct nfs41_call_sync_data {
 537         struct nfs_client *clp;
 538         struct nfs4_sequence_args *seq_args;
 539         struct nfs4_sequence_res *seq_res;
 540         int cache_reply;
 541 };
 542
 543 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 544 {
 545         struct nfs41_call_sync_data *data = calldata;
 546
 547         dprintk("--> %s data->clp->cl_session %p\n", __func__,
 548                 data->clp->cl_session);
 549         if (nfs4_setup_sequence(data->clp, data->seq_args,
 550                                 data->seq_res, data->cache_reply, task))
 551                 return;
 552         rpc_call_start(task);
 553 }
 554
 555 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 556 {
 557         struct nfs41_call_sync_data *data = calldata;
 558
 559         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
 560         nfs41_sequence_free_slot(data->clp, data->seq_res);
 561 }
 562
 563 struct rpc_call_ops nfs41_call_sync_ops = {
 564         .rpc_call_prepare = nfs41_call_sync_prepare,
 565         .rpc_call_done = nfs41_call_sync_done,
 566 };
 567
 568 static int nfs4_call_sync_sequence(struct nfs_client *clp,
 569                                    struct rpc_clnt *clnt,
 570                                    struct rpc_message *msg,
 571                                    struct nfs4_sequence_args *args,
 572                                    struct nfs4_sequence_res *res,
 573                                    int cache_reply)
 574 {
 575         int ret;
 576         struct rpc_task *task;
 577         struct nfs41_call_sync_data data = {
 578                 .clp = clp,
 579                 .seq_args = args,
 580                 .seq_res = res,
 581                 .cache_reply = cache_reply,
 582         };
 583         struct rpc_task_setup task_setup = {
 584                 .rpc_client = clnt,
 585                 .rpc_message = msg,
 586                 .callback_ops = &nfs41_call_sync_ops,
 587                 .callback_data = &data
 588         };
 589
 590         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 591         task = rpc_run_task(&task_setup);
 592         if (IS_ERR(task))
 593                 ret = PTR_ERR(task);
 594         else {
 595                 ret = task->tk_status;
 596                 rpc_put_task(task);
 597         }
 598         return ret;
 599 }
 600
 601 int _nfs4_call_sync_session(struct nfs_server *server,
 602                             struct rpc_message *msg,
 603                             struct nfs4_sequence_args *args,
 604                             struct nfs4_sequence_res *res,
 605                             int cache_reply)
 606 {
 607         return nfs4_call_sync_sequence(server->nfs_client, server->client,
 608                                        msg, args, res, cache_reply);
 609 }
 610
 611 #endif /* CONFIG_NFS_V4_1 */
 612
 613 int _nfs4_call_sync(struct nfs_server *server,
 614                     struct rpc_message *msg,
 615                     struct nfs4_sequence_args *args,
 616                     struct nfs4_sequence_res *res,
 617                     int cache_reply)
 618 {
 619         args->sa_session = res->sr_session = NULL;
 620         return rpc_call_sync(server->client, msg, 0);
 621 }
 622
 623 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 624         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 625                         &(res)->seq_res, (cache_reply))
 626
 627 static void nfs4_sequence_done(const struct nfs_server *server,
 628                                struct nfs4_sequence_res *res, int rpc_status)
 629 {
 630 #ifdef CONFIG_NFS_V4_1
 631         if (nfs4_has_session(server->nfs_client))
 632                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
 633 #endif /* CONFIG_NFS_V4_1 */
 634 }
 635
 636 /* no restart, therefore free slot here */
 637 static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
 638                                          struct nfs4_sequence_res *res,
 639                                          int rpc_status)
 640 {
 641         nfs4_sequence_done(server, res, rpc_status);
 642         nfs4_sequence_free_slot(server->nfs_client, res);
 643 }
 644
 645 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 646 {
 647         struct nfs_inode *nfsi = NFS_I(dir);
 648
 649         spin_lock(&dir->i_lock);
 650         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 651         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 652                 nfs_force_lookup_revalidate(dir);
 653         nfsi->change_attr = cinfo->after;
 654         spin_unlock(&dir->i_lock);
 655 }
 656
 657 struct nfs4_opendata {
 658         struct kref kref;
 659         struct nfs_openargs o_arg;
 660         struct nfs_openres o_res;
 661         struct nfs_open_confirmargs c_arg;
 662         struct nfs_open_confirmres c_res;
 663         struct nfs_fattr f_attr;
 664         struct nfs_fattr dir_attr;
 665         struct path path;
 666         struct dentry *dir;
 667         struct nfs4_state_owner *owner;
 668         struct nfs4_state *state;
 669         struct iattr attrs;
 670         unsigned long timestamp;
 671         unsigned int rpc_done : 1;
 672         int rpc_status;
 673         int cancelled;
 674 };
 675
 676
 677 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 678 {
 679         p->o_res.f_attr = &p->f_attr;
 680         p->o_res.dir_attr = &p->dir_attr;
 681         p->o_res.seqid = p->o_arg.seqid;
 682         p->c_res.seqid = p->c_arg.seqid;
 683         p->o_res.server = p->o_arg.server;
 684         nfs_fattr_init(&p->f_attr);
 685         nfs_fattr_init(&p->dir_attr);
 686         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 687 }
 688
 689 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 690                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 691                 const struct iattr *attrs)
 692 {
 693         struct dentry *parent = dget_parent(path->dentry);
 694         struct inode *dir = parent->d_inode;
 695         struct nfs_server *server = NFS_SERVER(dir);
 696         struct nfs4_opendata *p;
 697
 698         p = kzalloc(sizeof(*p), GFP_KERNEL);
 699         if (p == NULL)
 700                 goto err;
 701         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 702         if (p->o_arg.seqid == NULL)
 703                 goto err_free;
 704         p->path.mnt = mntget(path->mnt);
 705         p->path.dentry = dget(path->dentry);
 706         p->dir = parent;
 707         p->owner = sp;
 708         atomic_inc(&sp->so_count);
 709         p->o_arg.fh = NFS_FH(dir);
 710         p->o_arg.open_flags = flags;
 711         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 712         p->o_arg.clientid = server->nfs_client->cl_clientid;
 713         p->o_arg.id = sp->so_owner_id.id;
 714         p->o_arg.name = &p->path.dentry->d_name;
 715         p->o_arg.server = server;
 716         p->o_arg.bitmask = server->attr_bitmask;
 717         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 718         if (flags & O_EXCL) {
 719                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 720                 s[0] = jiffies;
 721                 s[1] = current->pid;
 722         } else if (flags & O_CREAT) {
 723                 p->o_arg.u.attrs = &p->attrs;
 724                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 725         }
 726         p->c_arg.fh = &p->o_res.fh;
 727         p->c_arg.stateid = &p->o_res.stateid;
 728         p->c_arg.seqid = p->o_arg.seqid;
 729         nfs4_init_opendata_res(p);
 730         kref_init(&p->kref);
 731         return p;
 732 err_free:
 733         kfree(p);
 734 err:
 735         dput(parent);
 736         return NULL;
 737 }
 738
 739 static void nfs4_opendata_free(struct kref *kref)
 740 {
 741         struct nfs4_opendata *p = container_of(kref,
 742                         struct nfs4_opendata, kref);
 743
 744         nfs_free_seqid(p->o_arg.seqid);
 745         if (p->state != NULL)
 746                 nfs4_put_open_state(p->state);
 747         nfs4_put_state_owner(p->owner);
 748         dput(p->dir);
 749         path_put(&p->path);
 750         kfree(p);
 751 }
 752
 753 static void nfs4_opendata_put(struct nfs4_opendata *p)
 754 {
 755         if (p != NULL)
 756                 kref_put(&p->kref, nfs4_opendata_free);
 757 }
 758
 759 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 760 {
 761         int ret;
 762
 763         ret = rpc_wait_for_completion_task(task);
 764         return ret;
 765 }
 766
 767 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 768 {
 769         int ret = 0;
 770
 771         if (open_mode & O_EXCL)
 772                 goto out;
 773         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 774                 case FMODE_READ:
 775                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 776                         break;
 777                 case FMODE_WRITE:
 778                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 779                         break;
 780                 case FMODE_READ|FMODE_WRITE:
 781                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 782         }
 783 out:
 784         return ret;
 785 }
 786
 787 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 788 {
 789         if ((delegation->type & fmode) != fmode)
 790                 return 0;
 791         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 792                 return 0;
 793         nfs_mark_delegation_referenced(delegation);
 794         return 1;
 795 }
 796
 797 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 798 {
 799         switch (fmode) {
 800                 case FMODE_WRITE:
 801                         state->n_wronly++;
 802                         break;
 803                 case FMODE_READ:
 804                         state->n_rdonly++;
 805                         break;
 806                 case FMODE_READ|FMODE_WRITE:
 807                         state->n_rdwr++;
 808         }
 809         nfs4_state_set_mode_locked(state, state->state | fmode);
 810 }
 811
 812 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 813 {
 814         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 815                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 816         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 817         switch (fmode) {
 818                 case FMODE_READ:
 819                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 820                         break;
 821                 case FMODE_WRITE:
 822                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 823                         break;
 824                 case FMODE_READ|FMODE_WRITE:
 825                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 826         }
 827 }
 828
 829 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 830 {
 831         write_seqlock(&state->seqlock);
 832         nfs_set_open_stateid_locked(state, stateid, fmode);
 833         write_sequnlock(&state->seqlock);
 834 }
 835
 836 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 837 {
 838         /*
 839          * Protect the call to nfs4_state_set_mode_locked and
 840          * serialise the stateid update
 841          */
 842         write_seqlock(&state->seqlock);
 843         if (deleg_stateid != NULL) {
 844                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 845                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 846         }
 847         if (open_stateid != NULL)
 848                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 849         write_sequnlock(&state->seqlock);
 850         spin_lock(&state->owner->so_lock);
 851         update_open_stateflags(state, fmode);
 852         spin_unlock(&state->owner->so_lock);
 853 }
 854
 855 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 856 {
 857         struct nfs_inode *nfsi = NFS_I(state->inode);
 858         struct nfs_delegation *deleg_cur;
 859         int ret = 0;
 860
 861         fmode &= (FMODE_READ|FMODE_WRITE);
 862
 863         rcu_read_lock();
 864         deleg_cur = rcu_dereference(nfsi->delegation);
 865         if (deleg_cur == NULL)
 866                 goto no_delegation;
 867
 868         spin_lock(&deleg_cur->lock);
 869         if (nfsi->delegation != deleg_cur ||
 870             (deleg_cur->type & fmode) != fmode)
 871                 goto no_delegation_unlock;
 872
 873         if (delegation == NULL)
 874                 delegation = &deleg_cur->stateid;
 875         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 876                 goto no_delegation_unlock;
 877
 878         nfs_mark_delegation_referenced(deleg_cur);
 879         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 880         ret = 1;
 881 no_delegation_unlock:
 882         spin_unlock(&deleg_cur->lock);
 883 no_delegation:
 884         rcu_read_unlock();
 885
 886         if (!ret && open_stateid != NULL) {
 887                 __update_open_stateid(state, open_stateid, NULL, fmode);
 888                 ret = 1;
 889         }
 890
 891         return ret;
 892 }
 893
 894
 895 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 896 {
 897         struct nfs_delegation *delegation;
 898
 899         rcu_read_lock();
 900         delegation = rcu_dereference(NFS_I(inode)->delegation);
 901         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 902                 rcu_read_unlock();
 903                 return;
 904         }
 905         rcu_read_unlock();
 906         nfs_inode_return_delegation(inode);
 907 }
 908
 909 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 910 {
 911         struct nfs4_state *state = opendata->state;
 912         struct nfs_inode *nfsi = NFS_I(state->inode);
 913         struct nfs_delegation *delegation;
 914         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 915         fmode_t fmode = opendata->o_arg.fmode;
 916         nfs4_stateid stateid;
 917         int ret = -EAGAIN;
 918
 919         for (;;) {
 920                 if (can_open_cached(state, fmode, open_mode)) {
 921                         spin_lock(&state->owner->so_lock);
 922                         if (can_open_cached(state, fmode, open_mode)) {
 923                                 update_open_stateflags(state, fmode);
 924                                 spin_unlock(&state->owner->so_lock);
 925                                 goto out_return_state;
 926                         }
 927                         spin_unlock(&state->owner->so_lock);
 928                 }
 929                 rcu_read_lock();
 930                 delegation = rcu_dereference(nfsi->delegation);
 931                 if (delegation == NULL ||
 932                     !can_open_delegated(delegation, fmode)) {
 933                         rcu_read_unlock();
 934                         break;
 935                 }
 936                 /* Save the delegation */
 937                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 938                 rcu_read_unlock();
 939                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 940                 if (ret != 0)
 941                         goto out;
 942                 ret = -EAGAIN;
 943
 944                 /* Try to update the stateid using the delegation */
 945                 if (update_open_stateid(state, NULL, &stateid, fmode))
 946                         goto out_return_state;
 947         }
 948 out:
 949         return ERR_PTR(ret);
 950 out_return_state:
 951         atomic_inc(&state->count);
 952         return state;
 953 }
 954
 955 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 956 {
 957         struct inode *inode;
 958         struct nfs4_state *state = NULL;
 959         struct nfs_delegation *delegation;
 960         int ret;
 961
 962         if (!data->rpc_done) {
 963                 state = nfs4_try_open_cached(data);
 964                 goto out;
 965         }
 966
 967         ret = -EAGAIN;
 968         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 969                 goto err;
 970         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 971         ret = PTR_ERR(inode);
 972         if (IS_ERR(inode))
 973                 goto err;
 974         ret = -ENOMEM;
 975         state = nfs4_get_open_state(inode, data->owner);
 976         if (state == NULL)
 977                 goto err_put_inode;
 978         if (data->o_res.delegation_type != 0) {
 979                 int delegation_flags = 0;
 980
 981                 rcu_read_lock();
 982                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 983                 if (delegation)
 984                         delegation_flags = delegation->flags;
 985                 rcu_read_unlock();
 986                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 987                         nfs_inode_set_delegation(state->inode,
 988                                         data->owner->so_cred,
 989                                         &data->o_res);
 990                 else
 991                         nfs_inode_reclaim_delegation(state->inode,
 992                                         data->owner->so_cred,
 993                                         &data->o_res);
 994         }
 995
 996         update_open_stateid(state, &data->o_res.stateid, NULL,
 997                         data->o_arg.fmode);
 998         iput(inode);
 999 out:
1000         return state;
1001 err_put_inode:
1002         iput(inode);
1003 err:
1004         return ERR_PTR(ret);
1005 }
1006
1007 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1008 {
1009         struct nfs_inode *nfsi = NFS_I(state->inode);
1010         struct nfs_open_context *ctx;
1011
1012         spin_lock(&state->inode->i_lock);
1013         list_for_each_entry(ctx, &nfsi->open_files, list) {
1014                 if (ctx->state != state)
1015                         continue;
1016                 get_nfs_open_context(ctx);
1017                 spin_unlock(&state->inode->i_lock);
1018                 return ctx;
1019         }
1020         spin_unlock(&state->inode->i_lock);
1021         return ERR_PTR(-ENOENT);
1022 }
1023
1024 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1025 {
1026         struct nfs4_opendata *opendata;
1027
1028         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1029         if (opendata == NULL)
1030                 return ERR_PTR(-ENOMEM);
1031         opendata->state = state;
1032         atomic_inc(&state->count);
1033         return opendata;
1034 }
1035
1036 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1037 {
1038         struct nfs4_state *newstate;
1039         int ret;
1040
1041         opendata->o_arg.open_flags = 0;
1042         opendata->o_arg.fmode = fmode;
1043         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1044         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1045         nfs4_init_opendata_res(opendata);
1046         ret = _nfs4_proc_open(opendata);
1047         if (ret != 0)
1048                 return ret;
1049         newstate = nfs4_opendata_to_nfs4_state(opendata);
1050         if (IS_ERR(newstate))
1051                 return PTR_ERR(newstate);
1052         nfs4_close_state(&opendata->path, newstate, fmode);
1053         *res = newstate;
1054         return 0;
1055 }
1056
1057 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1058 {
1059         struct nfs4_state *newstate;
1060         int ret;
1061
1062         /* memory barrier prior to reading state->n_* */
1063         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1064         smp_rmb();
1065         if (state->n_rdwr != 0) {
1066                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1067                 if (ret != 0)
1068                         return ret;
1069                 if (newstate != state)
1070                         return -ESTALE;
1071         }
1072         if (state->n_wronly != 0) {
1073                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1074                 if (ret != 0)
1075                         return ret;
1076                 if (newstate != state)
1077                         return -ESTALE;
1078         }
1079         if (state->n_rdonly != 0) {
1080                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1081                 if (ret != 0)
1082                         return ret;
1083                 if (newstate != state)
1084                         return -ESTALE;
1085         }
1086         /*
1087          * We may have performed cached opens for all three recoveries.
1088          * Check if we need to update the current stateid.
1089          */
1090         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1091             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1092                 write_seqlock(&state->seqlock);
1093                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1094                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1095                 write_sequnlock(&state->seqlock);
1096         }
1097         return 0;
1098 }
1099
1100 /*
1101  * OPEN_RECLAIM:
1102  *      reclaim state on the server after a reboot.
1103  */
1104 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1105 {
1106         struct nfs_delegation *delegation;
1107         struct nfs4_opendata *opendata;
1108         fmode_t delegation_type = 0;
1109         int status;
1110
1111         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1112         if (IS_ERR(opendata))
1113                 return PTR_ERR(opendata);
1114         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1115         opendata->o_arg.fh = NFS_FH(state->inode);
1116         rcu_read_lock();
1117         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1118         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1119                 delegation_type = delegation->type;
1120         rcu_read_unlock();
1121         opendata->o_arg.u.delegation_type = delegation_type;
1122         status = nfs4_open_recover(opendata, state);
1123         nfs4_opendata_put(opendata);
1124         return status;
1125 }
1126
1127 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1128 {
1129         struct nfs_server *server = NFS_SERVER(state->inode);
1130         struct nfs4_exception exception = { };
1131         int err;
1132         do {
1133                 err = _nfs4_do_open_reclaim(ctx, state);
1134                 if (err != -NFS4ERR_DELAY)
1135                         break;
1136                 nfs4_handle_exception(server, err, &exception);
1137         } while (exception.retry);
1138         return err;
1139 }
1140
1141 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1142 {
1143         struct nfs_open_context *ctx;
1144         int ret;
1145
1146         ctx = nfs4_state_find_open_context(state);
1147         if (IS_ERR(ctx))
1148                 return PTR_ERR(ctx);
1149         ret = nfs4_do_open_reclaim(ctx, state);
1150         put_nfs_open_context(ctx);
1151         return ret;
1152 }
1153
1154 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1155 {
1156         struct nfs4_opendata *opendata;
1157         int ret;
1158
1159         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1160         if (IS_ERR(opendata))
1161                 return PTR_ERR(opendata);
1162         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1163         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1164                         sizeof(opendata->o_arg.u.delegation.data));
1165         ret = nfs4_open_recover(opendata, state);
1166         nfs4_opendata_put(opendata);
1167         return ret;
1168 }
1169
1170 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1171 {
1172         struct nfs4_exception exception = { };
1173         struct nfs_server *server = NFS_SERVER(state->inode);
1174         int err;
1175         do {
1176                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1177                 switch (err) {
1178                         case 0:
1179                         case -ENOENT:
1180                         case -ESTALE:
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_free_slot(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 inline 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                 if (err != -NFS4ERR_DELAY)
1496                         break;
1497                 nfs4_handle_exception(server, err, &exception);
1498         } while (exception.retry);
1499         return err;
1500 }
1501
1502 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1503 {
1504         struct nfs_open_context *ctx;
1505         int ret;
1506
1507         ctx = nfs4_state_find_open_context(state);
1508         if (IS_ERR(ctx))
1509                 return PTR_ERR(ctx);
1510         ret = nfs4_do_open_expired(ctx, state);
1511         put_nfs_open_context(ctx);
1512         return ret;
1513 }
1514
1515 /*
1516  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1517  * fields corresponding to attributes that were used to store the verifier.
1518  * Make sure we clobber those fields in the later setattr call
1519  */
1520 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1521 {
1522         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1523             !(sattr->ia_valid & ATTR_ATIME_SET))
1524                 sattr->ia_valid |= ATTR_ATIME;
1525
1526         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1527             !(sattr->ia_valid & ATTR_MTIME_SET))
1528                 sattr->ia_valid |= ATTR_MTIME;
1529 }
1530
1531 /*
1532  * Returns a referenced nfs4_state
1533  */
1534 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)
1535 {
1536         struct nfs4_state_owner  *sp;
1537         struct nfs4_state     *state = NULL;
1538         struct nfs_server       *server = NFS_SERVER(dir);
1539         struct nfs4_opendata *opendata;
1540         int status;
1541
1542         /* Protect against reboot recovery conflicts */
1543         status = -ENOMEM;
1544         if (!(sp = nfs4_get_state_owner(server, cred))) {
1545                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1546                 goto out_err;
1547         }
1548         status = nfs4_recover_expired_lease(server);
1549         if (status != 0)
1550                 goto err_put_state_owner;
1551         if (path->dentry->d_inode != NULL)
1552                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1553         status = -ENOMEM;
1554         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1555         if (opendata == NULL)
1556                 goto err_put_state_owner;
1557
1558         if (path->dentry->d_inode != NULL)
1559                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1560
1561         status = _nfs4_proc_open(opendata);
1562         if (status != 0)
1563                 goto err_opendata_put;
1564
1565         if (opendata->o_arg.open_flags & O_EXCL)
1566                 nfs4_exclusive_attrset(opendata, sattr);
1567
1568         state = nfs4_opendata_to_nfs4_state(opendata);
1569         status = PTR_ERR(state);
1570         if (IS_ERR(state))
1571                 goto err_opendata_put;
1572         nfs4_opendata_put(opendata);
1573         nfs4_put_state_owner(sp);
1574         *res = state;
1575         return 0;
1576 err_opendata_put:
1577         nfs4_opendata_put(opendata);
1578 err_put_state_owner:
1579         nfs4_put_state_owner(sp);
1580 out_err:
1581         *res = NULL;
1582         return status;
1583 }
1584
1585
1586 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)
1587 {
1588         struct nfs4_exception exception = { };
1589         struct nfs4_state *res;
1590         int status;
1591
1592         do {
1593                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1594                 if (status == 0)
1595                         break;
1596                 /* NOTE: BAD_SEQID means the server and client disagree about the
1597                  * book-keeping w.r.t. state-changing operations
1598                  * (OPEN/CLOSE/LOCK/LOCKU...)
1599                  * It is actually a sign of a bug on the client or on the server.
1600                  *
1601                  * If we receive a BAD_SEQID error in the particular case of
1602                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1603                  * have unhashed the old state_owner for us, and that we can
1604                  * therefore safely retry using a new one. We should still warn
1605                  * the user though...
1606                  */
1607                 if (status == -NFS4ERR_BAD_SEQID) {
1608                         printk(KERN_WARNING "NFS: v4 server %s "
1609                                         " returned a bad sequence-id error!\n",
1610                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1611                         exception.retry = 1;
1612                         continue;
1613                 }
1614                 /*
1615                  * BAD_STATEID on OPEN means that the server cancelled our
1616                  * state before it received the OPEN_CONFIRM.
1617                  * Recover by retrying the request as per the discussion
1618                  * on Page 181 of RFC3530.
1619                  */
1620                 if (status == -NFS4ERR_BAD_STATEID) {
1621                         exception.retry = 1;
1622                         continue;
1623                 }
1624                 if (status == -EAGAIN) {
1625                         /* We must have found a delegation */
1626                         exception.retry = 1;
1627                         continue;
1628                 }
1629                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1630                                         status, &exception));
1631         } while (exception.retry);
1632         return res;
1633 }
1634
1635 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1636                             struct nfs_fattr *fattr, struct iattr *sattr,
1637                             struct nfs4_state *state)
1638 {
1639         struct nfs_server *server = NFS_SERVER(inode);
1640         struct nfs_setattrargs  arg = {
1641                 .fh             = NFS_FH(inode),
1642                 .iap            = sattr,
1643                 .server         = server,
1644                 .bitmask = server->attr_bitmask,
1645         };
1646         struct nfs_setattrres  res = {
1647                 .fattr          = fattr,
1648                 .server         = server,
1649         };
1650         struct rpc_message msg = {
1651                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1652                 .rpc_argp       = &arg,
1653                 .rpc_resp       = &res,
1654                 .rpc_cred       = cred,
1655         };
1656         unsigned long timestamp = jiffies;
1657         int status;
1658
1659         nfs_fattr_init(fattr);
1660
1661         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1662                 /* Use that stateid */
1663         } else if (state != NULL) {
1664                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1665         } else
1666                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1667
1668         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1669         if (status == 0 && state != NULL)
1670                 renew_lease(server, timestamp);
1671         return status;
1672 }
1673
1674 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1675                            struct nfs_fattr *fattr, struct iattr *sattr,
1676                            struct nfs4_state *state)
1677 {
1678         struct nfs_server *server = NFS_SERVER(inode);
1679         struct nfs4_exception exception = { };
1680         int err;
1681         do {
1682                 err = nfs4_handle_exception(server,
1683                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1684                                 &exception);
1685         } while (exception.retry);
1686         return err;
1687 }
1688
1689 struct nfs4_closedata {
1690         struct path path;
1691         struct inode *inode;
1692         struct nfs4_state *state;
1693         struct nfs_closeargs arg;
1694         struct nfs_closeres res;
1695         struct nfs_fattr fattr;
1696         unsigned long timestamp;
1697 };
1698
1699 static void nfs4_free_closedata(void *data)
1700 {
1701         struct nfs4_closedata *calldata = data;
1702         struct nfs4_state_owner *sp = calldata->state->owner;
1703
1704         nfs4_put_open_state(calldata->state);
1705         nfs_free_seqid(calldata->arg.seqid);
1706         nfs4_put_state_owner(sp);
1707         path_put(&calldata->path);
1708         kfree(calldata);
1709 }
1710
1711 static void nfs4_close_done(struct rpc_task *task, void *data)
1712 {
1713         struct nfs4_closedata *calldata = data;
1714         struct nfs4_state *state = calldata->state;
1715         struct nfs_server *server = NFS_SERVER(calldata->inode);
1716
1717         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1718         if (RPC_ASSASSINATED(task))
1719                 return;
1720         /* hmm. we are done with the inode, and in the process of freeing
1721          * the state_owner. we keep this around to process errors
1722          */
1723         switch (task->tk_status) {
1724                 case 0:
1725                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1726                         renew_lease(server, calldata->timestamp);
1727                         break;
1728                 case -NFS4ERR_STALE_STATEID:
1729                 case -NFS4ERR_OLD_STATEID:
1730                 case -NFS4ERR_BAD_STATEID:
1731                 case -NFS4ERR_EXPIRED:
1732                         if (calldata->arg.fmode == 0)
1733                                 break;
1734                 default:
1735                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1736                                 nfs4_restart_rpc(task, server->nfs_client);
1737                                 return;
1738                         }
1739         }
1740         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1741         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1742 }
1743
1744 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1745 {
1746         struct nfs4_closedata *calldata = data;
1747         struct nfs4_state *state = calldata->state;
1748         int clear_rd, clear_wr, clear_rdwr;
1749
1750         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1751                 return;
1752
1753         clear_rd = clear_wr = clear_rdwr = 0;
1754         spin_lock(&state->owner->so_lock);
1755         /* Calculate the change in open mode */
1756         if (state->n_rdwr == 0) {
1757                 if (state->n_rdonly == 0) {
1758                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1759                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1760                 }
1761                 if (state->n_wronly == 0) {
1762                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1763                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1764                 }
1765         }
1766         spin_unlock(&state->owner->so_lock);
1767         if (!clear_rd && !clear_wr && !clear_rdwr) {
1768                 /* Note: exit _without_ calling nfs4_close_done */
1769                 task->tk_action = NULL;
1770                 return;
1771         }
1772         nfs_fattr_init(calldata->res.fattr);
1773         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1774                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1775                 calldata->arg.fmode = FMODE_READ;
1776         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1777                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1778                 calldata->arg.fmode = FMODE_WRITE;
1779         }
1780         calldata->timestamp = jiffies;
1781         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1782                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1783                                 1, task))
1784                 return;
1785         rpc_call_start(task);
1786 }
1787
1788 static const struct rpc_call_ops nfs4_close_ops = {
1789         .rpc_call_prepare = nfs4_close_prepare,
1790         .rpc_call_done = nfs4_close_done,
1791         .rpc_release = nfs4_free_closedata,
1792 };
1793
1794 /*
1795  * It is possible for data to be read/written from a mem-mapped file
1796  * after the sys_close call (which hits the vfs layer as a flush).
1797  * This means that we can't safely call nfsv4 close on a file until
1798  * the inode is cleared. This in turn means that we are not good
1799  * NFSv4 citizens - we do not indicate to the server to update the file's
1800  * share state even when we are done with one of the three share
1801  * stateid's in the inode.
1802  *
1803  * NOTE: Caller must be holding the sp->so_owner semaphore!
1804  */
1805 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1806 {
1807         struct nfs_server *server = NFS_SERVER(state->inode);
1808         struct nfs4_closedata *calldata;
1809         struct nfs4_state_owner *sp = state->owner;
1810         struct rpc_task *task;
1811         struct rpc_message msg = {
1812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1813                 .rpc_cred = state->owner->so_cred,
1814         };
1815         struct rpc_task_setup task_setup_data = {
1816                 .rpc_client = server->client,
1817                 .rpc_message = &msg,
1818                 .callback_ops = &nfs4_close_ops,
1819                 .workqueue = nfsiod_workqueue,
1820                 .flags = RPC_TASK_ASYNC,
1821         };
1822         int status = -ENOMEM;
1823
1824         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1825         if (calldata == NULL)
1826                 goto out;
1827         calldata->inode = state->inode;
1828         calldata->state = state;
1829         calldata->arg.fh = NFS_FH(state->inode);
1830         calldata->arg.stateid = &state->open_stateid;
1831         if (nfs4_has_session(server->nfs_client))
1832                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1833         /* Serialization for the sequence id */
1834         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1835         if (calldata->arg.seqid == NULL)
1836                 goto out_free_calldata;
1837         calldata->arg.fmode = 0;
1838         calldata->arg.bitmask = server->cache_consistency_bitmask;
1839         calldata->res.fattr = &calldata->fattr;
1840         calldata->res.seqid = calldata->arg.seqid;
1841         calldata->res.server = server;
1842         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1843         calldata->path.mnt = mntget(path->mnt);
1844         calldata->path.dentry = dget(path->dentry);
1845
1846         msg.rpc_argp = &calldata->arg,
1847         msg.rpc_resp = &calldata->res,
1848         task_setup_data.callback_data = calldata;
1849         task = rpc_run_task(&task_setup_data);
1850         if (IS_ERR(task))
1851                 return PTR_ERR(task);
1852         status = 0;
1853         if (wait)
1854                 status = rpc_wait_for_completion_task(task);
1855         rpc_put_task(task);
1856         return status;
1857 out_free_calldata:
1858         kfree(calldata);
1859 out:
1860         nfs4_put_open_state(state);
1861         nfs4_put_state_owner(sp);
1862         return status;
1863 }
1864
1865 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1866 {
1867         struct file *filp;
1868         int ret;
1869
1870         /* If the open_intent is for execute, we have an extra check to make */
1871         if (fmode & FMODE_EXEC) {
1872                 ret = nfs_may_open(state->inode,
1873                                 state->owner->so_cred,
1874                                 nd->intent.open.flags);
1875                 if (ret < 0)
1876                         goto out_close;
1877         }
1878         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1879         if (!IS_ERR(filp)) {
1880                 struct nfs_open_context *ctx;
1881                 ctx = nfs_file_open_context(filp);
1882                 ctx->state = state;
1883                 return 0;
1884         }
1885         ret = PTR_ERR(filp);
1886 out_close:
1887         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1888         return ret;
1889 }
1890
1891 struct dentry *
1892 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1893 {
1894         struct path path = {
1895                 .mnt = nd->path.mnt,
1896                 .dentry = dentry,
1897         };
1898         struct dentry *parent;
1899         struct iattr attr;
1900         struct rpc_cred *cred;
1901         struct nfs4_state *state;
1902         struct dentry *res;
1903         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1904
1905         if (nd->flags & LOOKUP_CREATE) {
1906                 attr.ia_mode = nd->intent.open.create_mode;
1907                 attr.ia_valid = ATTR_MODE;
1908                 if (!IS_POSIXACL(dir))
1909                         attr.ia_mode &= ~current_umask();
1910         } else {
1911                 attr.ia_valid = 0;
1912                 BUG_ON(nd->intent.open.flags & O_CREAT);
1913         }
1914
1915         cred = rpc_lookup_cred();
1916         if (IS_ERR(cred))
1917                 return (struct dentry *)cred;
1918         parent = dentry->d_parent;
1919         /* Protect against concurrent sillydeletes */
1920         nfs_block_sillyrename(parent);
1921         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1922         put_rpccred(cred);
1923         if (IS_ERR(state)) {
1924                 if (PTR_ERR(state) == -ENOENT) {
1925                         d_add(dentry, NULL);
1926                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1927                 }
1928                 nfs_unblock_sillyrename(parent);
1929                 return (struct dentry *)state;
1930         }
1931         res = d_add_unique(dentry, igrab(state->inode));
1932         if (res != NULL)
1933                 path.dentry = res;
1934         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1935         nfs_unblock_sillyrename(parent);
1936         nfs4_intent_set_file(nd, &path, state, fmode);
1937         return res;
1938 }
1939
1940 int
1941 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1942 {
1943         struct path path = {
1944                 .mnt = nd->path.mnt,
1945                 .dentry = dentry,
1946         };
1947         struct rpc_cred *cred;
1948         struct nfs4_state *state;
1949         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1950
1951         cred = rpc_lookup_cred();
1952         if (IS_ERR(cred))
1953                 return PTR_ERR(cred);
1954         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1955         put_rpccred(cred);
1956         if (IS_ERR(state)) {
1957                 switch (PTR_ERR(state)) {
1958                         case -EPERM:
1959                         case -EACCES:
1960                         case -EDQUOT:
1961                         case -ENOSPC:
1962                         case -EROFS:
1963                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1964                                 return 1;
1965                         default:
1966                                 goto out_drop;
1967                 }
1968         }
1969         if (state->inode == dentry->d_inode) {
1970                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1971                 nfs4_intent_set_file(nd, &path, state, fmode);
1972                 return 1;
1973         }
1974         nfs4_close_sync(&path, state, fmode);
1975 out_drop:
1976         d_drop(dentry);
1977         return 0;
1978 }
1979
1980 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1981 {
1982         if (ctx->state == NULL)
1983                 return;
1984         if (is_sync)
1985                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1986         else
1987                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1988 }
1989
1990 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1991 {
1992         struct nfs4_server_caps_arg args = {
1993                 .fhandle = fhandle,
1994         };
1995         struct nfs4_server_caps_res res = {};
1996         struct rpc_message msg = {
1997                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1998                 .rpc_argp = &args,
1999                 .rpc_resp = &res,
2000         };
2001         int status;
2002
2003         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2004         if (status == 0) {
2005                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2006                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2007                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2008                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2009                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2010                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2011                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2012                         server->caps |= NFS_CAP_ACLS;
2013                 if (res.has_links != 0)
2014                         server->caps |= NFS_CAP_HARDLINKS;
2015                 if (res.has_symlinks != 0)
2016                         server->caps |= NFS_CAP_SYMLINKS;
2017                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2018                         server->caps |= NFS_CAP_FILEID;
2019                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2020                         server->caps |= NFS_CAP_MODE;
2021                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2022                         server->caps |= NFS_CAP_NLINK;
2023                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2024                         server->caps |= NFS_CAP_OWNER;
2025                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2026                         server->caps |= NFS_CAP_OWNER_GROUP;
2027                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2028                         server->caps |= NFS_CAP_ATIME;
2029                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2030                         server->caps |= NFS_CAP_CTIME;
2031                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2032                         server->caps |= NFS_CAP_MTIME;
2033
2034                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2035                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2036                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2037                 server->acl_bitmask = res.acl_bitmask;
2038         }
2039
2040         return status;
2041 }
2042
2043 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2044 {
2045         struct nfs4_exception exception = { };
2046         int err;
2047         do {
2048                 err = nfs4_handle_exception(server,
2049                                 _nfs4_server_capabilities(server, fhandle),
2050                                 &exception);
2051         } while (exception.retry);
2052         return err;
2053 }
2054
2055 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2056                 struct nfs_fsinfo *info)
2057 {
2058         struct nfs4_lookup_root_arg args = {
2059                 .bitmask = nfs4_fattr_bitmap,
2060         };
2061         struct nfs4_lookup_res res = {
2062                 .server = server,
2063                 .fattr = info->fattr,
2064                 .fh = fhandle,
2065         };
2066         struct rpc_message msg = {
2067                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2068                 .rpc_argp = &args,
2069                 .rpc_resp = &res,
2070         };
2071
2072         nfs_fattr_init(info->fattr);
2073         return nfs4_call_sync(server, &msg, &args, &res, 0);
2074 }
2075
2076 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2077                 struct nfs_fsinfo *info)
2078 {
2079         struct nfs4_exception exception = { };
2080         int err;
2081         do {
2082                 err = nfs4_handle_exception(server,
2083                                 _nfs4_lookup_root(server, fhandle, info),
2084                                 &exception);
2085         } while (exception.retry);
2086         return err;
2087 }
2088
2089 /*
2090  * get the file handle for the "/" directory on the server
2091  */
2092 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2093                               struct nfs_fsinfo *info)
2094 {
2095         int status;
2096
2097         status = nfs4_lookup_root(server, fhandle, info);
2098         if (status == 0)
2099                 status = nfs4_server_capabilities(server, fhandle);
2100         if (status == 0)
2101                 status = nfs4_do_fsinfo(server, fhandle, info);
2102         return nfs4_map_errors(status);
2103 }
2104
2105 /*
2106  * Get locations and (maybe) other attributes of a referral.
2107  * Note that we'll actually follow the referral later when
2108  * we detect fsid mismatch in inode revalidation
2109  */
2110 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2111 {
2112         int status = -ENOMEM;
2113         struct page *page = NULL;
2114         struct nfs4_fs_locations *locations = NULL;
2115
2116         page = alloc_page(GFP_KERNEL);
2117         if (page == NULL)
2118                 goto out;
2119         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2120         if (locations == NULL)
2121                 goto out;
2122
2123         status = nfs4_proc_fs_locations(dir, name, locations, page);
2124         if (status != 0)
2125                 goto out;
2126         /* Make sure server returned a different fsid for the referral */
2127         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2128                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2129                 status = -EIO;
2130                 goto out;
2131         }
2132
2133         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2134         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2135         if (!fattr->mode)
2136                 fattr->mode = S_IFDIR;
2137         memset(fhandle, 0, sizeof(struct nfs_fh));
2138 out:
2139         if (page)
2140                 __free_page(page);
2141         if (locations)
2142                 kfree(locations);
2143         return status;
2144 }
2145
2146 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2147 {
2148         struct nfs4_getattr_arg args = {
2149                 .fh = fhandle,
2150                 .bitmask = server->attr_bitmask,
2151         };
2152         struct nfs4_getattr_res res = {
2153                 .fattr = fattr,
2154                 .server = server,
2155         };
2156         struct rpc_message msg = {
2157                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2158                 .rpc_argp = &args,
2159                 .rpc_resp = &res,
2160         };
2161
2162         nfs_fattr_init(fattr);
2163         return nfs4_call_sync(server, &msg, &args, &res, 0);
2164 }
2165
2166 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2167 {
2168         struct nfs4_exception exception = { };
2169         int err;
2170         do {
2171                 err = nfs4_handle_exception(server,
2172                                 _nfs4_proc_getattr(server, fhandle, fattr),
2173                                 &exception);
2174         } while (exception.retry);
2175         return err;
2176 }
2177
2178 /*
2179  * The file is not closed if it is opened due to the a request to change
2180  * the size of the file. The open call will not be needed once the
2181  * VFS layer lookup-intents are implemented.
2182  *
2183  * Close is called when the inode is destroyed.
2184  * If we haven't opened the file for O_WRONLY, we
2185  * need to in the size_change case to obtain a stateid.
2186  *
2187  * Got race?
2188  * Because OPEN is always done by name in nfsv4, it is
2189  * possible that we opened a different file by the same
2190  * name.  We can recognize this race condition, but we
2191  * can't do anything about it besides returning an error.
2192  *
2193  * This will be fixed with VFS changes (lookup-intent).
2194  */
2195 static int
2196 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2197                   struct iattr *sattr)
2198 {
2199         struct inode *inode = dentry->d_inode;
2200         struct rpc_cred *cred = NULL;
2201         struct nfs4_state *state = NULL;
2202         int status;
2203
2204         nfs_fattr_init(fattr);
2205
2206         /* Search for an existing open(O_WRITE) file */
2207         if (sattr->ia_valid & ATTR_FILE) {
2208                 struct nfs_open_context *ctx;
2209
2210                 ctx = nfs_file_open_context(sattr->ia_file);
2211                 if (ctx) {
2212                         cred = ctx->cred;
2213                         state = ctx->state;
2214                 }
2215         }
2216
2217         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2218         if (status == 0)
2219                 nfs_setattr_update_inode(inode, sattr);
2220         return status;
2221 }
2222
2223 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2224                 const struct qstr *name, struct nfs_fh *fhandle,
2225                 struct nfs_fattr *fattr)
2226 {
2227         int                    status;
2228         struct nfs4_lookup_arg args = {
2229                 .bitmask = server->attr_bitmask,
2230                 .dir_fh = dirfh,
2231                 .name = name,
2232         };
2233         struct nfs4_lookup_res res = {
2234                 .server = server,
2235                 .fattr = fattr,
2236                 .fh = fhandle,
2237         };
2238         struct rpc_message msg = {
2239                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2240                 .rpc_argp = &args,
2241                 .rpc_resp = &res,
2242         };
2243
2244         nfs_fattr_init(fattr);
2245
2246         dprintk("NFS call  lookupfh %s\n", name->name);
2247         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2248         dprintk("NFS reply lookupfh: %d\n", status);
2249         return status;
2250 }
2251
2252 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2253                               struct qstr *name, struct nfs_fh *fhandle,
2254                               struct nfs_fattr *fattr)
2255 {
2256         struct nfs4_exception exception = { };
2257         int err;
2258         do {
2259                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2260                 /* FIXME: !!!! */
2261                 if (err == -NFS4ERR_MOVED) {
2262                         err = -EREMOTE;
2263                         break;
2264                 }
2265                 err = nfs4_handle_exception(server, err, &exception);
2266         } while (exception.retry);
2267         return err;
2268 }
2269
2270 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2271                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2272 {
2273         int status;
2274
2275         dprintk("NFS call  lookup %s\n", name->name);
2276         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2277         if (status == -NFS4ERR_MOVED)
2278                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2279         dprintk("NFS reply lookup: %d\n", status);
2280         return status;
2281 }
2282
2283 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2284 {
2285         struct nfs4_exception exception = { };
2286         int err;
2287         do {
2288                 err = nfs4_handle_exception(NFS_SERVER(dir),
2289                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2290                                 &exception);
2291         } while (exception.retry);
2292         return err;
2293 }
2294
2295 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2296 {
2297         struct nfs_server *server = NFS_SERVER(inode);
2298         struct nfs_fattr fattr;
2299         struct nfs4_accessargs args = {
2300                 .fh = NFS_FH(inode),
2301                 .bitmask = server->attr_bitmask,
2302         };
2303         struct nfs4_accessres res = {
2304                 .server = server,
2305                 .fattr = &fattr,
2306         };
2307         struct rpc_message msg = {
2308                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2309                 .rpc_argp = &args,
2310                 .rpc_resp = &res,
2311                 .rpc_cred = entry->cred,
2312         };
2313         int mode = entry->mask;
2314         int status;
2315
2316         /*
2317          * Determine which access bits we want to ask for...
2318          */
2319         if (mode & MAY_READ)
2320                 args.access |= NFS4_ACCESS_READ;
2321         if (S_ISDIR(inode->i_mode)) {
2322                 if (mode & MAY_WRITE)
2323                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2324                 if (mode & MAY_EXEC)
2325                         args.access |= NFS4_ACCESS_LOOKUP;
2326         } else {
2327                 if (mode & MAY_WRITE)
2328                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2329                 if (mode & MAY_EXEC)
2330                         args.access |= NFS4_ACCESS_EXECUTE;
2331         }
2332         nfs_fattr_init(&fattr);
2333         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2334         if (!status) {
2335                 entry->mask = 0;
2336                 if (res.access & NFS4_ACCESS_READ)
2337                         entry->mask |= MAY_READ;
2338                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2339                         entry->mask |= MAY_WRITE;
2340                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2341                         entry->mask |= MAY_EXEC;
2342                 nfs_refresh_inode(inode, &fattr);
2343         }
2344         return status;
2345 }
2346
2347 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2348 {
2349         struct nfs4_exception exception = { };
2350         int err;
2351         do {
2352                 err = nfs4_handle_exception(NFS_SERVER(inode),
2353                                 _nfs4_proc_access(inode, entry),
2354                                 &exception);
2355         } while (exception.retry);
2356         return err;
2357 }
2358
2359 /*
2360  * TODO: For the time being, we don't try to get any attributes
2361  * along with any of the zero-copy operations READ, READDIR,
2362  * READLINK, WRITE.
2363  *
2364  * In the case of the first three, we want to put the GETATTR
2365  * after the read-type operation -- this is because it is hard
2366  * to predict the length of a GETATTR response in v4, and thus
2367  * align the READ data correctly.  This means that the GETATTR
2368  * may end up partially falling into the page cache, and we should
2369  * shift it into the 'tail' of the xdr_buf before processing.
2370  * To do this efficiently, we need to know the total length
2371  * of data received, which doesn't seem to be available outside
2372  * of the RPC layer.
2373  *
2374  * In the case of WRITE, we also want to put the GETATTR after
2375  * the operation -- in this case because we want to make sure
2376  * we get the post-operation mtime and size.  This means that
2377  * we can't use xdr_encode_pages() as written: we need a variant
2378  * of it which would leave room in the 'tail' iovec.
2379  *
2380  * Both of these changes to the XDR layer would in fact be quite
2381  * minor, but I decided to leave them for a subsequent patch.
2382  */
2383 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2384                 unsigned int pgbase, unsigned int pglen)
2385 {
2386         struct nfs4_readlink args = {
2387                 .fh       = NFS_FH(inode),
2388                 .pgbase   = pgbase,
2389                 .pglen    = pglen,
2390                 .pages    = &page,
2391         };
2392         struct nfs4_readlink_res res;
2393         struct rpc_message msg = {
2394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2395                 .rpc_argp = &args,
2396                 .rpc_resp = &res,
2397         };
2398
2399         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2400 }
2401
2402 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2403                 unsigned int pgbase, unsigned int pglen)
2404 {
2405         struct nfs4_exception exception = { };
2406         int err;
2407         do {
2408                 err = nfs4_handle_exception(NFS_SERVER(inode),
2409                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2410                                 &exception);
2411         } while (exception.retry);
2412         return err;
2413 }
2414
2415 /*
2416  * Got race?
2417  * We will need to arrange for the VFS layer to provide an atomic open.
2418  * Until then, this create/open method is prone to inefficiency and race
2419  * conditions due to the lookup, create, and open VFS calls from sys_open()
2420  * placed on the wire.
2421  *
2422  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2423  * The file will be opened again in the subsequent VFS open call
2424  * (nfs4_proc_file_open).
2425  *
2426  * The open for read will just hang around to be used by any process that
2427  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2428  */
2429
2430 static int
2431 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2432                  int flags, struct nameidata *nd)
2433 {
2434         struct path path = {
2435                 .mnt = nd->path.mnt,
2436                 .dentry = dentry,
2437         };
2438         struct nfs4_state *state;
2439         struct rpc_cred *cred;
2440         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2441         int status = 0;
2442
2443         cred = rpc_lookup_cred();
2444         if (IS_ERR(cred)) {
2445                 status = PTR_ERR(cred);
2446                 goto out;
2447         }
2448         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2449         d_drop(dentry);
2450         if (IS_ERR(state)) {
2451                 status = PTR_ERR(state);
2452                 goto out_putcred;
2453         }
2454         d_add(dentry, igrab(state->inode));
2455         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2456         if (flags & O_EXCL) {
2457                 struct nfs_fattr fattr;
2458                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2459                 if (status == 0)
2460                         nfs_setattr_update_inode(state->inode, sattr);
2461                 nfs_post_op_update_inode(state->inode, &fattr);
2462         }
2463         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2464                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2465         else
2466                 nfs4_close_sync(&path, state, fmode);
2467 out_putcred:
2468         put_rpccred(cred);
2469 out:
2470         return status;
2471 }
2472
2473 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2474 {
2475         struct nfs_server *server = NFS_SERVER(dir);
2476         struct nfs_removeargs args = {
2477                 .fh = NFS_FH(dir),
2478                 .name.len = name->len,
2479                 .name.name = name->name,
2480                 .bitmask = server->attr_bitmask,
2481         };
2482         struct nfs_removeres res = {
2483                 .server = server,
2484         };
2485         struct rpc_message msg = {
2486                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2487                 .rpc_argp = &args,
2488                 .rpc_resp = &res,
2489         };
2490         int                     status;
2491
2492         nfs_fattr_init(&res.dir_attr);
2493         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2494         if (status == 0) {
2495                 update_changeattr(dir, &res.cinfo);
2496                 nfs_post_op_update_inode(dir, &res.dir_attr);
2497         }
2498         return status;
2499 }
2500
2501 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2502 {
2503         struct nfs4_exception exception = { };
2504         int err;
2505         do {
2506                 err = nfs4_handle_exception(NFS_SERVER(dir),
2507                                 _nfs4_proc_remove(dir, name),
2508                                 &exception);
2509         } while (exception.retry);
2510         return err;
2511 }
2512
2513 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2514 {
2515         struct nfs_server *server = NFS_SERVER(dir);
2516         struct nfs_removeargs *args = msg->rpc_argp;
2517         struct nfs_removeres *res = msg->rpc_resp;
2518
2519         args->bitmask = server->cache_consistency_bitmask;
2520         res->server = server;
2521         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2522 }
2523
2524 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2525 {
2526         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2527
2528         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2529         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2530                 return 0;
2531         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2532         update_changeattr(dir, &res->cinfo);
2533         nfs_post_op_update_inode(dir, &res->dir_attr);
2534         return 1;
2535 }
2536
2537 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2538                 struct inode *new_dir, struct qstr *new_name)
2539 {
2540         struct nfs_server *server = NFS_SERVER(old_dir);
2541         struct nfs4_rename_arg arg = {
2542                 .old_dir = NFS_FH(old_dir),
2543                 .new_dir = NFS_FH(new_dir),
2544                 .old_name = old_name,
2545                 .new_name = new_name,
2546                 .bitmask = server->attr_bitmask,
2547         };
2548         struct nfs_fattr old_fattr, new_fattr;
2549         struct nfs4_rename_res res = {
2550                 .server = server,
2551                 .old_fattr = &old_fattr,
2552                 .new_fattr = &new_fattr,
2553         };
2554         struct rpc_message msg = {
2555                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2556                 .rpc_argp = &arg,
2557                 .rpc_resp = &res,
2558         };
2559         int                     status;
2560
2561         nfs_fattr_init(res.old_fattr);
2562         nfs_fattr_init(res.new_fattr);
2563         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2564
2565         if (!status) {
2566                 update_changeattr(old_dir, &res.old_cinfo);
2567                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2568                 update_changeattr(new_dir, &res.new_cinfo);
2569                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2570         }
2571         return status;
2572 }
2573
2574 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2575                 struct inode *new_dir, struct qstr *new_name)
2576 {
2577         struct nfs4_exception exception = { };
2578         int err;
2579         do {
2580                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2581                                 _nfs4_proc_rename(old_dir, old_name,
2582                                         new_dir, new_name),
2583                                 &exception);
2584         } while (exception.retry);
2585         return err;
2586 }
2587
2588 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2589 {
2590         struct nfs_server *server = NFS_SERVER(inode);
2591         struct nfs4_link_arg arg = {
2592                 .fh     = NFS_FH(inode),
2593                 .dir_fh = NFS_FH(dir),
2594                 .name   = name,
2595                 .bitmask = server->attr_bitmask,
2596         };
2597         struct nfs_fattr fattr, dir_attr;
2598         struct nfs4_link_res res = {
2599                 .server = server,
2600                 .fattr = &fattr,
2601                 .dir_attr = &dir_attr,
2602         };
2603         struct rpc_message msg = {
2604                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2605                 .rpc_argp = &arg,
2606                 .rpc_resp = &res,
2607         };
2608         int                     status;
2609
2610         nfs_fattr_init(res.fattr);
2611         nfs_fattr_init(res.dir_attr);
2612         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2613         if (!status) {
2614                 update_changeattr(dir, &res.cinfo);
2615                 nfs_post_op_update_inode(dir, res.dir_attr);
2616                 nfs_post_op_update_inode(inode, res.fattr);
2617         }
2618
2619         return status;
2620 }
2621
2622 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2623 {
2624         struct nfs4_exception exception = { };
2625         int err;
2626         do {
2627                 err = nfs4_handle_exception(NFS_SERVER(inode),
2628                                 _nfs4_proc_link(inode, dir, name),
2629                                 &exception);
2630         } while (exception.retry);
2631         return err;
2632 }
2633
2634 struct nfs4_createdata {
2635         struct rpc_message msg;
2636         struct nfs4_create_arg arg;
2637         struct nfs4_create_res res;
2638         struct nfs_fh fh;
2639         struct nfs_fattr fattr;
2640         struct nfs_fattr dir_fattr;
2641 };
2642
2643 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2644                 struct qstr *name, struct iattr *sattr, u32 ftype)
2645 {
2646         struct nfs4_createdata *data;
2647
2648         data = kzalloc(sizeof(*data), GFP_KERNEL);
2649         if (data != NULL) {
2650                 struct nfs_server *server = NFS_SERVER(dir);
2651
2652                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2653                 data->msg.rpc_argp = &data->arg;
2654                 data->msg.rpc_resp = &data->res;
2655                 data->arg.dir_fh = NFS_FH(dir);
2656                 data->arg.server = server;
2657                 data->arg.name = name;
2658                 data->arg.attrs = sattr;
2659                 data->arg.ftype = ftype;
2660                 data->arg.bitmask = server->attr_bitmask;
2661                 data->res.server = server;
2662                 data->res.fh = &data->fh;
2663                 data->res.fattr = &data->fattr;
2664                 data->res.dir_fattr = &data->dir_fattr;
2665                 nfs_fattr_init(data->res.fattr);
2666                 nfs_fattr_init(data->res.dir_fattr);
2667         }
2668         return data;
2669 }
2670
2671 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2672 {
2673         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2674                                     &data->arg, &data->res, 1);
2675         if (status == 0) {
2676                 update_changeattr(dir, &data->res.dir_cinfo);
2677                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2678                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2679         }
2680         return status;
2681 }
2682
2683 static void nfs4_free_createdata(struct nfs4_createdata *data)
2684 {
2685         kfree(data);
2686 }
2687
2688 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2689                 struct page *page, unsigned int len, struct iattr *sattr)
2690 {
2691         struct nfs4_createdata *data;
2692         int status = -ENAMETOOLONG;
2693
2694         if (len > NFS4_MAXPATHLEN)
2695                 goto out;
2696
2697         status = -ENOMEM;
2698         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2699         if (data == NULL)
2700                 goto out;
2701
2702         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2703         data->arg.u.symlink.pages = &page;
2704         data->arg.u.symlink.len = len;
2705
2706         status = nfs4_do_create(dir, dentry, data);
2707
2708         nfs4_free_createdata(data);
2709 out:
2710         return status;
2711 }
2712
2713 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2714                 struct page *page, unsigned int len, struct iattr *sattr)
2715 {
2716         struct nfs4_exception exception = { };
2717         int err;
2718         do {
2719                 err = nfs4_handle_exception(NFS_SERVER(dir),
2720                                 _nfs4_proc_symlink(dir, dentry, page,
2721                                                         len, sattr),
2722                                 &exception);
2723         } while (exception.retry);
2724         return err;
2725 }
2726
2727 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2728                 struct iattr *sattr)
2729 {
2730         struct nfs4_createdata *data;
2731         int status = -ENOMEM;
2732
2733         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2734         if (data == NULL)
2735                 goto out;
2736
2737         status = nfs4_do_create(dir, dentry, data);
2738
2739         nfs4_free_createdata(data);
2740 out:
2741         return status;
2742 }
2743
2744 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2745                 struct iattr *sattr)
2746 {
2747         struct nfs4_exception exception = { };
2748         int err;
2749         do {
2750                 err = nfs4_handle_exception(NFS_SERVER(dir),
2751                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2752                                 &exception);
2753         } while (exception.retry);
2754         return err;
2755 }
2756
2757 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2758                   u64 cookie, struct page *page, unsigned int count, int plus)
2759 {
2760         struct inode            *dir = dentry->d_inode;
2761         struct nfs4_readdir_arg args = {
2762                 .fh = NFS_FH(dir),
2763                 .pages = &page,
2764                 .pgbase = 0,
2765                 .count = count,
2766                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2767         };
2768         struct nfs4_readdir_res res;
2769         struct rpc_message msg = {
2770                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2771                 .rpc_argp = &args,
2772                 .rpc_resp = &res,
2773                 .rpc_cred = cred,
2774         };
2775         int                     status;
2776
2777         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2778                         dentry->d_parent->d_name.name,
2779                         dentry->d_name.name,
2780                         (unsigned long long)cookie);
2781         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2782         res.pgbase = args.pgbase;
2783         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2784         if (status == 0)
2785                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2786
2787         nfs_invalidate_atime(dir);
2788
2789         dprintk("%s: returns %d\n", __func__, status);
2790         return status;
2791 }
2792
2793 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2794                   u64 cookie, struct page *page, unsigned int count, int plus)
2795 {
2796         struct nfs4_exception exception = { };
2797         int err;
2798         do {
2799                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2800                                 _nfs4_proc_readdir(dentry, cred, cookie,
2801                                         page, count, plus),
2802                                 &exception);
2803         } while (exception.retry);
2804         return err;
2805 }
2806
2807 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2808                 struct iattr *sattr, dev_t rdev)
2809 {
2810         struct nfs4_createdata *data;
2811         int mode = sattr->ia_mode;
2812         int status = -ENOMEM;
2813
2814         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2815         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2816
2817         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2818         if (data == NULL)
2819                 goto out;
2820
2821         if (S_ISFIFO(mode))
2822                 data->arg.ftype = NF4FIFO;
2823         else if (S_ISBLK(mode)) {
2824                 data->arg.ftype = NF4BLK;
2825                 data->arg.u.device.specdata1 = MAJOR(rdev);
2826                 data->arg.u.device.specdata2 = MINOR(rdev);
2827         }
2828         else if (S_ISCHR(mode)) {
2829                 data->arg.ftype = NF4CHR;
2830                 data->arg.u.device.specdata1 = MAJOR(rdev);
2831                 data->arg.u.device.specdata2 = MINOR(rdev);
2832         }
2833
2834         status = nfs4_do_create(dir, dentry, data);
2835
2836         nfs4_free_createdata(data);
2837 out:
2838         return status;
2839 }
2840
2841 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2842                 struct iattr *sattr, dev_t rdev)
2843 {
2844         struct nfs4_exception exception = { };
2845         int err;
2846         do {
2847                 err = nfs4_handle_exception(NFS_SERVER(dir),
2848                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2849                                 &exception);
2850         } while (exception.retry);
2851         return err;
2852 }
2853
2854 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2855                  struct nfs_fsstat *fsstat)
2856 {
2857         struct nfs4_statfs_arg args = {
2858                 .fh = fhandle,
2859                 .bitmask = server->attr_bitmask,
2860         };
2861         struct nfs4_statfs_res res = {
2862                 .fsstat = fsstat,
2863         };
2864         struct rpc_message msg = {
2865                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2866                 .rpc_argp = &args,
2867                 .rpc_resp = &res,
2868         };
2869
2870         nfs_fattr_init(fsstat->fattr);
2871         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2872 }
2873
2874 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2875 {
2876         struct nfs4_exception exception = { };
2877         int err;
2878         do {
2879                 err = nfs4_handle_exception(server,
2880                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2881                                 &exception);
2882         } while (exception.retry);
2883         return err;
2884 }
2885
2886 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2887                 struct nfs_fsinfo *fsinfo)
2888 {
2889         struct nfs4_fsinfo_arg args = {
2890                 .fh = fhandle,
2891                 .bitmask = server->attr_bitmask,
2892         };
2893         struct nfs4_fsinfo_res res = {
2894                 .fsinfo = fsinfo,
2895         };
2896         struct rpc_message msg = {
2897                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2898                 .rpc_argp = &args,
2899                 .rpc_resp = &res,
2900         };
2901
2902         return nfs4_call_sync(server, &msg, &args, &res, 0);
2903 }
2904
2905 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2906 {
2907         struct nfs4_exception exception = { };
2908         int err;
2909
2910         do {
2911                 err = nfs4_handle_exception(server,
2912                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2913                                 &exception);
2914         } while (exception.retry);
2915         return err;
2916 }
2917
2918 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2919 {
2920         nfs_fattr_init(fsinfo->fattr);
2921         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2922 }
2923
2924 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2925                 struct nfs_pathconf *pathconf)
2926 {
2927         struct nfs4_pathconf_arg args = {
2928                 .fh = fhandle,
2929                 .bitmask = server->attr_bitmask,
2930         };
2931         struct nfs4_pathconf_res res = {
2932                 .pathconf = pathconf,
2933         };
2934         struct rpc_message msg = {
2935                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2936                 .rpc_argp = &args,
2937                 .rpc_resp = &res,
2938         };
2939
2940         /* None of the pathconf attributes are mandatory to implement */
2941         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2942                 memset(pathconf, 0, sizeof(*pathconf));
2943                 return 0;
2944         }
2945
2946         nfs_fattr_init(pathconf->fattr);
2947         return nfs4_call_sync(server, &msg, &args, &res, 0);
2948 }
2949
2950 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2951                 struct nfs_pathconf *pathconf)
2952 {
2953         struct nfs4_exception exception = { };
2954         int err;
2955
2956         do {
2957                 err = nfs4_handle_exception(server,
2958                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2959                                 &exception);
2960         } while (exception.retry);
2961         return err;
2962 }
2963
2964 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2965 {
2966         struct nfs_server *server = NFS_SERVER(data->inode);
2967
2968         dprintk("--> %s\n", __func__);
2969
2970         /* nfs4_sequence_free_slot called in the read rpc_call_done */
2971         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2972
2973         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2974                 nfs4_restart_rpc(task, server->nfs_client);
2975                 return -EAGAIN;
2976         }
2977
2978         nfs_invalidate_atime(data->inode);
2979         if (task->tk_status > 0)
2980                 renew_lease(server, data->timestamp);
2981         return 0;
2982 }
2983
2984 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2985 {
2986         data->timestamp   = jiffies;
2987         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2988 }
2989
2990 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2991 {
2992         struct inode *inode = data->inode;
2993
2994         /* slot is freed in nfs_writeback_done */
2995         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2996                            task->tk_status);
2997
2998         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2999                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3000                 return -EAGAIN;
3001         }
3002         if (task->tk_status >= 0) {
3003                 renew_lease(NFS_SERVER(inode), data->timestamp);
3004                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3005         }
3006         return 0;
3007 }
3008
3009 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3010 {
3011         struct nfs_server *server = NFS_SERVER(data->inode);
3012
3013         data->args.bitmask = server->cache_consistency_bitmask;
3014         data->res.server = server;
3015         data->timestamp   = jiffies;
3016
3017         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3018 }
3019
3020 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3021 {
3022         struct inode *inode = data->inode;
3023
3024         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3025                            task->tk_status);
3026         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3027                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3028                 return -EAGAIN;
3029         }
3030         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
3031                                 &data->res.seq_res);
3032         nfs_refresh_inode(inode, data->res.fattr);
3033         return 0;
3034 }
3035
3036 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3037 {
3038         struct nfs_server *server = NFS_SERVER(data->inode);
3039
3040         data->args.bitmask = server->cache_consistency_bitmask;
3041         data->res.server = server;
3042         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3043 }
3044
3045 /*
3046  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3047  * standalone procedure for queueing an asynchronous RENEW.
3048  */
3049 static void nfs4_renew_done(struct rpc_task *task, void *data)
3050 {
3051         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3052         unsigned long timestamp = (unsigned long)data;
3053
3054         if (task->tk_status < 0) {
3055                 /* Unless we're shutting down, schedule state recovery! */
3056                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3057                         nfs4_schedule_state_recovery(clp);
3058                 return;
3059         }
3060         spin_lock(&clp->cl_lock);
3061         if (time_before(clp->cl_last_renewal,timestamp))
3062                 clp->cl_last_renewal = timestamp;
3063         spin_unlock(&clp->cl_lock);
3064         dprintk("%s calling put_rpccred on rpc_cred %p\n", __func__,
3065                                 task->tk_msg.rpc_cred);
3066         put_rpccred(task->tk_msg.rpc_cred);
3067 }
3068
3069 static const struct rpc_call_ops nfs4_renew_ops = {
3070         .rpc_call_done = nfs4_renew_done,
3071 };
3072
3073 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3074 {
3075         struct rpc_message msg = {
3076                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3077                 .rpc_argp       = clp,
3078                 .rpc_cred       = cred,
3079         };
3080
3081         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3082                         &nfs4_renew_ops, (void *)jiffies);
3083 }
3084
3085 int nfs4_proc_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         unsigned long now = jiffies;
3093         int status;
3094
3095         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3096         if (status < 0)
3097                 return status;
3098         spin_lock(&clp->cl_lock);
3099         if (time_before(clp->cl_last_renewal,now))
3100                 clp->cl_last_renewal = now;
3101         spin_unlock(&clp->cl_lock);
3102         return 0;
3103 }
3104
3105 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3106 {
3107         return (server->caps & NFS_CAP_ACLS)
3108                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3109                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3110 }
3111
3112 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3113  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3114  * the stack.
3115  */
3116 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3117
3118 static void buf_to_pages(const void *buf, size_t buflen,
3119                 struct page **pages, unsigned int *pgbase)
3120 {
3121         const void *p = buf;
3122
3123         *pgbase = offset_in_page(buf);
3124         p -= *pgbase;
3125         while (p < buf + buflen) {
3126                 *(pages++) = virt_to_page(p);
3127                 p += PAGE_CACHE_SIZE;
3128         }
3129 }
3130
3131 struct nfs4_cached_acl {
3132         int cached;
3133         size_t len;
3134         char data[0];
3135 };
3136
3137 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3138 {
3139         struct nfs_inode *nfsi = NFS_I(inode);
3140
3141         spin_lock(&inode->i_lock);
3142         kfree(nfsi->nfs4_acl);
3143         nfsi->nfs4_acl = acl;
3144         spin_unlock(&inode->i_lock);
3145 }
3146
3147 static void nfs4_zap_acl_attr(struct inode *inode)
3148 {
3149         nfs4_set_cached_acl(inode, NULL);
3150 }
3151
3152 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3153 {
3154         struct nfs_inode *nfsi = NFS_I(inode);
3155         struct nfs4_cached_acl *acl;
3156         int ret = -ENOENT;
3157
3158         spin_lock(&inode->i_lock);
3159         acl = nfsi->nfs4_acl;
3160         if (acl == NULL)
3161                 goto out;
3162         if (buf == NULL) /* user is just asking for length */
3163                 goto out_len;
3164         if (acl->cached == 0)
3165                 goto out;
3166         ret = -ERANGE; /* see getxattr(2) man page */
3167         if (acl->len > buflen)
3168                 goto out;
3169         memcpy(buf, acl->data, acl->len);
3170 out_len:
3171         ret = acl->len;
3172 out:
3173         spin_unlock(&inode->i_lock);
3174         return ret;
3175 }
3176
3177 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3178 {
3179         struct nfs4_cached_acl *acl;
3180
3181         if (buf && acl_len <= PAGE_SIZE) {
3182                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3183                 if (acl == NULL)
3184                         goto out;
3185                 acl->cached = 1;
3186                 memcpy(acl->data, buf, acl_len);
3187         } else {
3188                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3189                 if (acl == NULL)
3190                         goto out;
3191                 acl->cached = 0;
3192         }
3193         acl->len = acl_len;
3194 out:
3195         nfs4_set_cached_acl(inode, acl);
3196 }
3197
3198 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3199 {
3200         struct page *pages[NFS4ACL_MAXPAGES];
3201         struct nfs_getaclargs args = {
3202                 .fh = NFS_FH(inode),
3203                 .acl_pages = pages,
3204                 .acl_len = buflen,
3205         };
3206         struct nfs_getaclres res = {
3207                 .acl_len = buflen,
3208         };
3209         void *resp_buf;
3210         struct rpc_message msg = {
3211                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3212                 .rpc_argp = &args,
3213                 .rpc_resp = &res,
3214         };
3215         struct page *localpage = NULL;
3216         int ret;
3217
3218         if (buflen < PAGE_SIZE) {
3219                 /* As long as we're doing a round trip to the server anyway,
3220                  * let's be prepared for a page of acl data. */
3221                 localpage = alloc_page(GFP_KERNEL);
3222                 resp_buf = page_address(localpage);
3223                 if (localpage == NULL)
3224                         return -ENOMEM;
3225                 args.acl_pages[0] = localpage;
3226                 args.acl_pgbase = 0;
3227                 args.acl_len = PAGE_SIZE;
3228         } else {
3229                 resp_buf = buf;
3230                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3231         }
3232         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3233         if (ret)
3234                 goto out_free;
3235         if (res.acl_len > args.acl_len)
3236                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3237         else
3238                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3239         if (buf) {
3240                 ret = -ERANGE;
3241                 if (res.acl_len > buflen)
3242                         goto out_free;
3243                 if (localpage)
3244                         memcpy(buf, resp_buf, res.acl_len);
3245         }
3246         ret = res.acl_len;
3247 out_free:
3248         if (localpage)
3249                 __free_page(localpage);
3250         return ret;
3251 }
3252
3253 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3254 {
3255         struct nfs4_exception exception = { };
3256         ssize_t ret;
3257         do {
3258                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3259                 if (ret >= 0)
3260                         break;
3261                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3262         } while (exception.retry);
3263         return ret;
3264 }
3265
3266 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3267 {
3268         struct nfs_server *server = NFS_SERVER(inode);
3269         int ret;
3270
3271         if (!nfs4_server_supports_acls(server))
3272                 return -EOPNOTSUPP;
3273         ret = nfs_revalidate_inode(server, inode);
3274         if (ret < 0)
3275                 return ret;
3276         ret = nfs4_read_cached_acl(inode, buf, buflen);
3277         if (ret != -ENOENT)
3278                 return ret;
3279         return nfs4_get_acl_uncached(inode, buf, buflen);
3280 }
3281
3282 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3283 {
3284         struct nfs_server *server = NFS_SERVER(inode);
3285         struct page *pages[NFS4ACL_MAXPAGES];
3286         struct nfs_setaclargs arg = {
3287                 .fh             = NFS_FH(inode),
3288                 .acl_pages      = pages,
3289                 .acl_len        = buflen,
3290         };
3291         struct nfs_setaclres res;
3292         struct rpc_message msg = {
3293                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3294                 .rpc_argp       = &arg,
3295                 .rpc_resp       = &res,
3296         };
3297         int ret;
3298
3299         if (!nfs4_server_supports_acls(server))
3300                 return -EOPNOTSUPP;
3301         nfs_inode_return_delegation(inode);
3302         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3303         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3304         nfs_access_zap_cache(inode);
3305         nfs_zap_acl_cache(inode);
3306         return ret;
3307 }
3308
3309 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3310 {
3311         struct nfs4_exception exception = { };
3312         int err;
3313         do {
3314                 err = nfs4_handle_exception(NFS_SERVER(inode),
3315                                 __nfs4_proc_set_acl(inode, buf, buflen),
3316                                 &exception);
3317         } while (exception.retry);
3318         return err;
3319 }
3320
3321 static int
3322 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3323 {
3324         if (!clp || task->tk_status >= 0)
3325                 return 0;
3326         switch(task->tk_status) {
3327                 case -NFS4ERR_ADMIN_REVOKED:
3328                 case -NFS4ERR_BAD_STATEID:
3329                 case -NFS4ERR_OPENMODE:
3330                         if (state == NULL)
3331                                 break;
3332                         nfs4_state_mark_reclaim_nograce(clp, state);
3333                 case -NFS4ERR_STALE_CLIENTID:
3334                 case -NFS4ERR_STALE_STATEID:
3335                 case -NFS4ERR_EXPIRED:
3336                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3337                         nfs4_schedule_state_recovery(clp);
3338                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3339                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3340                         task->tk_status = 0;
3341                         return -EAGAIN;
3342 #if defined(CONFIG_NFS_V4_1)
3343                 case -NFS4ERR_BADSESSION:
3344                 case -NFS4ERR_BADSLOT:
3345                 case -NFS4ERR_BAD_HIGH_SLOT:
3346                 case -NFS4ERR_DEADSESSION:
3347                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3348                 case -NFS4ERR_SEQ_FALSE_RETRY:
3349                 case -NFS4ERR_SEQ_MISORDERED:
3350                         dprintk("%s ERROR %d, Reset session\n", __func__,
3351                                 task->tk_status);
3352                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
3353                         task->tk_status = 0;
3354                         return -EAGAIN;
3355 #endif /* CONFIG_NFS_V4_1 */
3356                 case -NFS4ERR_DELAY:
3357                         if (server)
3358                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3359                 case -NFS4ERR_GRACE:
3360                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3361                         task->tk_status = 0;
3362                         return -EAGAIN;
3363                 case -NFS4ERR_OLD_STATEID:
3364                         task->tk_status = 0;
3365                         return -EAGAIN;
3366         }
3367         task->tk_status = nfs4_map_errors(task->tk_status);
3368         return 0;
3369 }
3370
3371 static int
3372 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3373 {
3374         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3375 }
3376
3377 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3378 {
3379         nfs4_verifier sc_verifier;
3380         struct nfs4_setclientid setclientid = {
3381                 .sc_verifier = &sc_verifier,
3382                 .sc_prog = program,
3383         };
3384         struct rpc_message msg = {
3385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3386                 .rpc_argp = &setclientid,
3387                 .rpc_resp = clp,
3388                 .rpc_cred = cred,
3389         };
3390         __be32 *p;
3391         int loop = 0;
3392         int status;
3393
3394         p = (__be32*)sc_verifier.data;
3395         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3396         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3397
3398         for(;;) {
3399                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3400                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3401                                 clp->cl_ipaddr,
3402                                 rpc_peeraddr2str(clp->cl_rpcclient,
3403                                                         RPC_DISPLAY_ADDR),
3404                                 rpc_peeraddr2str(clp->cl_rpcclient,
3405                                                         RPC_DISPLAY_PROTO),
3406                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3407                                 clp->cl_id_uniquifier);
3408                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3409                                 sizeof(setclientid.sc_netid),
3410                                 rpc_peeraddr2str(clp->cl_rpcclient,
3411                                                         RPC_DISPLAY_NETID));
3412                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3413                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3414                                 clp->cl_ipaddr, port >> 8, port & 255);
3415
3416                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3417                 if (status != -NFS4ERR_CLID_INUSE)
3418                         break;
3419                 if (signalled())
3420                         break;
3421                 if (loop++ & 1)
3422                         ssleep(clp->cl_lease_time + 1);
3423                 else
3424                         if (++clp->cl_id_uniquifier == 0)
3425                                 break;
3426         }
3427         return status;
3428 }
3429
3430 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3431 {
3432         struct nfs_fsinfo fsinfo;
3433         struct rpc_message msg = {
3434                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3435                 .rpc_argp = clp,
3436                 .rpc_resp = &fsinfo,
3437                 .rpc_cred = cred,
3438         };
3439         unsigned long now;
3440         int status;
3441
3442         now = jiffies;
3443         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3444         if (status == 0) {
3445                 spin_lock(&clp->cl_lock);
3446                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3447                 clp->cl_last_renewal = now;
3448                 spin_unlock(&clp->cl_lock);
3449         }
3450         return status;
3451 }
3452
3453 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3454 {
3455         long timeout = 0;
3456         int err;
3457         do {
3458                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3459                 switch (err) {
3460                         case 0:
3461                                 return err;
3462                         case -NFS4ERR_RESOURCE:
3463                                 /* The IBM lawyers misread another document! */
3464                         case -NFS4ERR_DELAY:
3465                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3466                 }
3467         } while (err == 0);
3468         return err;
3469 }
3470
3471 struct nfs4_delegreturndata {
3472         struct nfs4_delegreturnargs args;
3473         struct nfs4_delegreturnres res;
3474         struct nfs_fh fh;
3475         nfs4_stateid stateid;
3476         unsigned long timestamp;
3477         struct nfs_fattr fattr;
3478         int rpc_status;
3479 };
3480
3481 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3482 {
3483         struct nfs4_delegreturndata *data = calldata;
3484
3485         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3486                                      task->tk_status);
3487
3488         data->rpc_status = task->tk_status;
3489         if (data->rpc_status == 0)
3490                 renew_lease(data->res.server, data->timestamp);
3491 }
3492
3493 static void nfs4_delegreturn_release(void *calldata)
3494 {
3495         kfree(calldata);
3496 }
3497
3498 #if defined(CONFIG_NFS_V4_1)
3499 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3500 {
3501         struct nfs4_delegreturndata *d_data;
3502
3503         d_data = (struct nfs4_delegreturndata *)data;
3504
3505         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3506                                 &d_data->args.seq_args,
3507                                 &d_data->res.seq_res, 1, task))
3508                 return;
3509         rpc_call_start(task);
3510 }
3511 #endif /* CONFIG_NFS_V4_1 */
3512
3513 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3514 #if defined(CONFIG_NFS_V4_1)
3515         .rpc_call_prepare = nfs4_delegreturn_prepare,
3516 #endif /* CONFIG_NFS_V4_1 */
3517         .rpc_call_done = nfs4_delegreturn_done,
3518         .rpc_release = nfs4_delegreturn_release,
3519 };
3520
3521 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3522 {
3523         struct nfs4_delegreturndata *data;
3524         struct nfs_server *server = NFS_SERVER(inode);
3525         struct rpc_task *task;
3526         struct rpc_message msg = {
3527                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3528                 .rpc_cred = cred,
3529         };
3530         struct rpc_task_setup task_setup_data = {
3531                 .rpc_client = server->client,
3532                 .rpc_message = &msg,
3533                 .callback_ops = &nfs4_delegreturn_ops,
3534                 .flags = RPC_TASK_ASYNC,
3535         };
3536         int status = 0;
3537
3538         data = kzalloc(sizeof(*data), GFP_KERNEL);
3539         if (data == NULL)
3540                 return -ENOMEM;
3541         data->args.fhandle = &data->fh;
3542         data->args.stateid = &data->stateid;
3543         data->args.bitmask = server->attr_bitmask;
3544         nfs_copy_fh(&data->fh, NFS_FH(inode));
3545         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3546         data->res.fattr = &data->fattr;
3547         data->res.server = server;
3548         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3549         nfs_fattr_init(data->res.fattr);
3550         data->timestamp = jiffies;
3551         data->rpc_status = 0;
3552
3553         task_setup_data.callback_data = data;
3554         msg.rpc_argp = &data->args,
3555         msg.rpc_resp = &data->res,
3556         task = rpc_run_task(&task_setup_data);
3557         if (IS_ERR(task))
3558                 return PTR_ERR(task);
3559         if (!issync)
3560                 goto out;
3561         status = nfs4_wait_for_completion_rpc_task(task);
3562         if (status != 0)
3563                 goto out;
3564         status = data->rpc_status;
3565         if (status != 0)
3566                 goto out;
3567         nfs_refresh_inode(inode, &data->fattr);
3568 out:
3569         rpc_put_task(task);
3570         return status;
3571 }
3572
3573 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3574 {
3575         struct nfs_server *server = NFS_SERVER(inode);
3576         struct nfs4_exception exception = { };
3577         int err;
3578         do {
3579                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3580                 switch (err) {
3581                         case -NFS4ERR_STALE_STATEID:
3582                         case -NFS4ERR_EXPIRED:
3583                         case 0:
3584                                 return 0;
3585                 }
3586                 err = nfs4_handle_exception(server, err, &exception);
3587         } while (exception.retry);
3588         return err;
3589 }
3590
3591 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3592 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3593
3594 /*
3595  * sleep, with exponential backoff, and retry the LOCK operation.
3596  */
3597 static unsigned long
3598 nfs4_set_lock_task_retry(unsigned long timeout)
3599 {
3600         schedule_timeout_killable(timeout);
3601         timeout <<= 1;
3602         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3603                 return NFS4_LOCK_MAXTIMEOUT;
3604         return timeout;
3605 }
3606
3607 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3608 {
3609         struct inode *inode = state->inode;
3610         struct nfs_server *server = NFS_SERVER(inode);
3611         struct nfs_client *clp = server->nfs_client;
3612         struct nfs_lockt_args arg = {
3613                 .fh = NFS_FH(inode),
3614                 .fl = request,
3615         };
3616         struct nfs_lockt_res res = {
3617                 .denied = request,
3618         };
3619         struct rpc_message msg = {
3620                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3621                 .rpc_argp       = &arg,
3622                 .rpc_resp       = &res,
3623                 .rpc_cred       = state->owner->so_cred,
3624         };
3625         struct nfs4_lock_state *lsp;
3626         int status;
3627
3628         arg.lock_owner.clientid = clp->cl_clientid;
3629         status = nfs4_set_lock_state(state, request);
3630         if (status != 0)
3631                 goto out;
3632         lsp = request->fl_u.nfs4_fl.owner;
3633         arg.lock_owner.id = lsp->ls_id.id;
3634         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3635         switch (status) {
3636                 case 0:
3637                         request->fl_type = F_UNLCK;
3638                         break;
3639                 case -NFS4ERR_DENIED:
3640                         status = 0;
3641         }
3642         request->fl_ops->fl_release_private(request);
3643 out:
3644         return status;
3645 }
3646
3647 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3648 {
3649         struct nfs4_exception exception = { };
3650         int err;
3651
3652         do {
3653                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3654                                 _nfs4_proc_getlk(state, cmd, request),
3655                                 &exception);
3656         } while (exception.retry);
3657         return err;
3658 }
3659
3660 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3661 {
3662         int res = 0;
3663         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3664                 case FL_POSIX:
3665                         res = posix_lock_file_wait(file, fl);
3666                         break;
3667                 case FL_FLOCK:
3668                         res = flock_lock_file_wait(file, fl);
3669                         break;
3670                 default:
3671                         BUG();
3672         }
3673         return res;
3674 }
3675
3676 struct nfs4_unlockdata {
3677         struct nfs_locku_args arg;
3678         struct nfs_locku_res res;
3679         struct nfs4_lock_state *lsp;
3680         struct nfs_open_context *ctx;
3681         struct file_lock fl;
3682         const struct nfs_server *server;
3683         unsigned long timestamp;
3684 };
3685
3686 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3687                 struct nfs_open_context *ctx,
3688                 struct nfs4_lock_state *lsp,
3689                 struct nfs_seqid *seqid)
3690 {
3691         struct nfs4_unlockdata *p;
3692         struct inode *inode = lsp->ls_state->inode;
3693
3694         p = kzalloc(sizeof(*p), GFP_KERNEL);
3695         if (p == NULL)
3696                 return NULL;
3697         p->arg.fh = NFS_FH(inode);
3698         p->arg.fl = &p->fl;
3699         p->arg.seqid = seqid;
3700         p->res.seqid = seqid;
3701         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3702         p->arg.stateid = &lsp->ls_stateid;
3703         p->lsp = lsp;
3704         atomic_inc(&lsp->ls_count);
3705         /* Ensure we don't close file until we're done freeing locks! */
3706         p->ctx = get_nfs_open_context(ctx);
3707         memcpy(&p->fl, fl, sizeof(p->fl));
3708         p->server = NFS_SERVER(inode);
3709         return p;
3710 }
3711
3712 static void nfs4_locku_release_calldata(void *data)
3713 {
3714         struct nfs4_unlockdata *calldata = data;
3715         nfs_free_seqid(calldata->arg.seqid);
3716         nfs4_put_lock_state(calldata->lsp);
3717         put_nfs_open_context(calldata->ctx);
3718         kfree(calldata);
3719 }
3720
3721 static void nfs4_locku_done(struct rpc_task *task, void *data)
3722 {
3723         struct nfs4_unlockdata *calldata = data;
3724
3725         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3726                            task->tk_status);
3727         if (RPC_ASSASSINATED(task))
3728                 return;
3729         switch (task->tk_status) {
3730                 case 0:
3731                         memcpy(calldata->lsp->ls_stateid.data,
3732                                         calldata->res.stateid.data,
3733                                         sizeof(calldata->lsp->ls_stateid.data));
3734                         renew_lease(calldata->server, calldata->timestamp);
3735                         break;
3736                 case -NFS4ERR_BAD_STATEID:
3737                 case -NFS4ERR_OLD_STATEID:
3738                 case -NFS4ERR_STALE_STATEID:
3739                 case -NFS4ERR_EXPIRED:
3740                         break;
3741                 default:
3742                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3743                                 nfs4_restart_rpc(task,
3744                                                 calldata->server->nfs_client);
3745         }
3746         nfs4_sequence_free_slot(calldata->server->nfs_client,
3747                                 &calldata->res.seq_res);
3748 }
3749
3750 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3751 {
3752         struct nfs4_unlockdata *calldata = data;
3753
3754         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3755                 return;
3756         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3757                 /* Note: exit _without_ running nfs4_locku_done */
3758                 task->tk_action = NULL;
3759                 return;
3760         }
3761         calldata->timestamp = jiffies;
3762         if (nfs4_setup_sequence(calldata->server->nfs_client,
3763                                 &calldata->arg.seq_args,
3764                                 &calldata->res.seq_res, 1, task))
3765                 return;
3766         rpc_call_start(task);
3767 }
3768
3769 static const struct rpc_call_ops nfs4_locku_ops = {
3770         .rpc_call_prepare = nfs4_locku_prepare,
3771         .rpc_call_done = nfs4_locku_done,
3772         .rpc_release = nfs4_locku_release_calldata,
3773 };
3774
3775 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3776                 struct nfs_open_context *ctx,
3777                 struct nfs4_lock_state *lsp,
3778                 struct nfs_seqid *seqid)
3779 {
3780         struct nfs4_unlockdata *data;
3781         struct rpc_message msg = {
3782                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3783                 .rpc_cred = ctx->cred,
3784         };
3785         struct rpc_task_setup task_setup_data = {
3786                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3787                 .rpc_message = &msg,
3788                 .callback_ops = &nfs4_locku_ops,
3789                 .workqueue = nfsiod_workqueue,
3790                 .flags = RPC_TASK_ASYNC,
3791         };
3792
3793         /* Ensure this is an unlock - when canceling a lock, the
3794          * canceled lock is passed in, and it won't be an unlock.
3795          */
3796         fl->fl_type = F_UNLCK;
3797
3798         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3799         if (data == NULL) {
3800                 nfs_free_seqid(seqid);
3801                 return ERR_PTR(-ENOMEM);
3802         }
3803
3804         msg.rpc_argp = &data->arg,
3805         msg.rpc_resp = &data->res,
3806         task_setup_data.callback_data = data;
3807         return rpc_run_task(&task_setup_data);
3808 }
3809
3810 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3811 {
3812         struct nfs_inode *nfsi = NFS_I(state->inode);
3813         struct nfs_seqid *seqid;
3814         struct nfs4_lock_state *lsp;
3815         struct rpc_task *task;
3816         int status = 0;
3817         unsigned char fl_flags = request->fl_flags;
3818
3819         status = nfs4_set_lock_state(state, request);
3820         /* Unlock _before_ we do the RPC call */
3821         request->fl_flags |= FL_EXISTS;
3822         down_read(&nfsi->rwsem);
3823         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3824                 up_read(&nfsi->rwsem);
3825                 goto out;
3826         }
3827         up_read(&nfsi->rwsem);
3828         if (status != 0)
3829                 goto out;
3830         /* Is this a delegated lock? */
3831         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3832                 goto out;
3833         lsp = request->fl_u.nfs4_fl.owner;
3834         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3835         status = -ENOMEM;
3836         if (seqid == NULL)
3837                 goto out;
3838         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3839         status = PTR_ERR(task);
3840         if (IS_ERR(task))
3841                 goto out;
3842         status = nfs4_wait_for_completion_rpc_task(task);
3843         rpc_put_task(task);
3844 out:
3845         request->fl_flags = fl_flags;
3846         return status;
3847 }
3848
3849 struct nfs4_lockdata {
3850         struct nfs_lock_args arg;
3851         struct nfs_lock_res res;
3852         struct nfs4_lock_state *lsp;
3853         struct nfs_open_context *ctx;
3854         struct file_lock fl;
3855         unsigned long timestamp;
3856         int rpc_status;
3857         int cancelled;
3858         struct nfs_server *server;
3859 };
3860
3861 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3862                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3863 {
3864         struct nfs4_lockdata *p;
3865         struct inode *inode = lsp->ls_state->inode;
3866         struct nfs_server *server = NFS_SERVER(inode);
3867
3868         p = kzalloc(sizeof(*p), GFP_KERNEL);
3869         if (p == NULL)
3870                 return NULL;
3871
3872         p->arg.fh = NFS_FH(inode);
3873         p->arg.fl = &p->fl;
3874         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3875         if (p->arg.open_seqid == NULL)
3876                 goto out_free;
3877         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3878         if (p->arg.lock_seqid == NULL)
3879                 goto out_free_seqid;
3880         p->arg.lock_stateid = &lsp->ls_stateid;
3881         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3882         p->arg.lock_owner.id = lsp->ls_id.id;
3883         p->res.lock_seqid = p->arg.lock_seqid;
3884         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3885         p->lsp = lsp;
3886         p->server = server;
3887         atomic_inc(&lsp->ls_count);
3888         p->ctx = get_nfs_open_context(ctx);
3889         memcpy(&p->fl, fl, sizeof(p->fl));
3890         return p;
3891 out_free_seqid:
3892         nfs_free_seqid(p->arg.open_seqid);
3893 out_free:
3894         kfree(p);
3895         return NULL;
3896 }
3897
3898 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3899 {
3900         struct nfs4_lockdata *data = calldata;
3901         struct nfs4_state *state = data->lsp->ls_state;
3902
3903         dprintk("%s: begin!\n", __func__);
3904         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3905                 return;
3906         /* Do we need to do an open_to_lock_owner? */
3907         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3908                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3909                         return;
3910                 data->arg.open_stateid = &state->stateid;
3911                 data->arg.new_lock_owner = 1;
3912                 data->res.open_seqid = data->arg.open_seqid;
3913         } else
3914                 data->arg.new_lock_owner = 0;
3915         data->timestamp = jiffies;
3916         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3917                                 &data->res.seq_res, 1, task))
3918                 return;
3919         rpc_call_start(task);
3920         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3921 }
3922
3923 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3924 {
3925         struct nfs4_lockdata *data = calldata;
3926
3927         dprintk("%s: begin!\n", __func__);
3928
3929         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3930                                      task->tk_status);
3931
3932         data->rpc_status = task->tk_status;
3933         if (RPC_ASSASSINATED(task))
3934                 goto out;
3935         if (data->arg.new_lock_owner != 0) {
3936                 if (data->rpc_status == 0)
3937                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3938                 else
3939                         goto out;
3940         }
3941         if (data->rpc_status == 0) {
3942                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3943                                         sizeof(data->lsp->ls_stateid.data));
3944                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3945                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3946         }
3947 out:
3948         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3949 }
3950
3951 static void nfs4_lock_release(void *calldata)
3952 {
3953         struct nfs4_lockdata *data = calldata;
3954
3955         dprintk("%s: begin!\n", __func__);
3956         nfs_free_seqid(data->arg.open_seqid);
3957         if (data->cancelled != 0) {
3958                 struct rpc_task *task;
3959                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3960                                 data->arg.lock_seqid);
3961                 if (!IS_ERR(task))
3962                         rpc_put_task(task);
3963                 dprintk("%s: cancelling lock!\n", __func__);
3964         } else
3965                 nfs_free_seqid(data->arg.lock_seqid);
3966         nfs4_put_lock_state(data->lsp);
3967         put_nfs_open_context(data->ctx);
3968         kfree(data);
3969         dprintk("%s: done!\n", __func__);
3970 }
3971
3972 static const struct rpc_call_ops nfs4_lock_ops = {
3973         .rpc_call_prepare = nfs4_lock_prepare,
3974         .rpc_call_done = nfs4_lock_done,
3975         .rpc_release = nfs4_lock_release,
3976 };
3977
3978 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3979 {
3980         struct nfs4_lockdata *data;
3981         struct rpc_task *task;
3982         struct rpc_message msg = {
3983                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3984                 .rpc_cred = state->owner->so_cred,
3985         };
3986         struct rpc_task_setup task_setup_data = {
3987                 .rpc_client = NFS_CLIENT(state->inode),
3988                 .rpc_message = &msg,
3989                 .callback_ops = &nfs4_lock_ops,
3990                 .workqueue = nfsiod_workqueue,
3991                 .flags = RPC_TASK_ASYNC,
3992         };
3993         int ret;
3994
3995         dprintk("%s: begin!\n", __func__);
3996         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3997                         fl->fl_u.nfs4_fl.owner);
3998         if (data == NULL)
3999                 return -ENOMEM;
4000         if (IS_SETLKW(cmd))
4001                 data->arg.block = 1;
4002         if (reclaim != 0)
4003                 data->arg.reclaim = 1;
4004         msg.rpc_argp = &data->arg,
4005         msg.rpc_resp = &data->res,
4006         task_setup_data.callback_data = data;
4007         task = rpc_run_task(&task_setup_data);
4008         if (IS_ERR(task))
4009                 return PTR_ERR(task);
4010         ret = nfs4_wait_for_completion_rpc_task(task);
4011         if (ret == 0) {
4012                 ret = data->rpc_status;
4013         } else
4014                 data->cancelled = 1;
4015         rpc_put_task(task);
4016         dprintk("%s: done, ret = %d!\n", __func__, ret);
4017         return ret;
4018 }
4019
4020 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4021 {
4022         struct nfs_server *server = NFS_SERVER(state->inode);
4023         struct nfs4_exception exception = { };
4024         int err;
4025
4026         do {
4027                 /* Cache the lock if possible... */
4028                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4029                         return 0;
4030                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4031                 if (err != -NFS4ERR_DELAY)
4032                         break;
4033                 nfs4_handle_exception(server, err, &exception);
4034         } while (exception.retry);
4035         return err;
4036 }
4037
4038 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4039 {
4040         struct nfs_server *server = NFS_SERVER(state->inode);
4041         struct nfs4_exception exception = { };
4042         int err;
4043
4044         err = nfs4_set_lock_state(state, request);
4045         if (err != 0)
4046                 return err;
4047         do {
4048                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4049                         return 0;
4050                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4051                 if (err != -NFS4ERR_DELAY)
4052                         break;
4053                 nfs4_handle_exception(server, err, &exception);
4054         } while (exception.retry);
4055         return err;
4056 }
4057
4058 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4059 {
4060         struct nfs_inode *nfsi = NFS_I(state->inode);
4061         unsigned char fl_flags = request->fl_flags;
4062         int status;
4063
4064         /* Is this a delegated open? */
4065         status = nfs4_set_lock_state(state, request);
4066         if (status != 0)
4067                 goto out;
4068         request->fl_flags |= FL_ACCESS;
4069         status = do_vfs_lock(request->fl_file, request);
4070         if (status < 0)
4071                 goto out;
4072         down_read(&nfsi->rwsem);
4073         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4074                 /* Yes: cache locks! */
4075                 /* ...but avoid races with delegation recall... */
4076                 request->fl_flags = fl_flags & ~FL_SLEEP;
4077                 status = do_vfs_lock(request->fl_file, request);
4078                 goto out_unlock;
4079         }
4080         status = _nfs4_do_setlk(state, cmd, request, 0);
4081         if (status != 0)
4082                 goto out_unlock;
4083         /* Note: we always want to sleep here! */
4084         request->fl_flags = fl_flags | FL_SLEEP;
4085         if (do_vfs_lock(request->fl_file, request) < 0)
4086                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4087 out_unlock:
4088         up_read(&nfsi->rwsem);
4089 out:
4090         request->fl_flags = fl_flags;
4091         return status;
4092 }
4093
4094 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4095 {
4096         struct nfs4_exception exception = { };
4097         int err;
4098
4099         do {
4100                 err = _nfs4_proc_setlk(state, cmd, request);
4101                 if (err == -NFS4ERR_DENIED)
4102                         err = -EAGAIN;
4103                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4104                                 err, &exception);
4105         } while (exception.retry);
4106         return err;
4107 }
4108
4109 static int
4110 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4111 {
4112         struct nfs_open_context *ctx;
4113         struct nfs4_state *state;
4114         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4115         int status;
4116
4117         /* verify open state */
4118         ctx = nfs_file_open_context(filp);
4119         state = ctx->state;
4120
4121         if (request->fl_start < 0 || request->fl_end < 0)
4122                 return -EINVAL;
4123
4124         if (IS_GETLK(cmd)) {
4125                 if (state != NULL)
4126                         return nfs4_proc_getlk(state, F_GETLK, request);
4127                 return 0;
4128         }
4129
4130         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4131                 return -EINVAL;
4132
4133         if (request->fl_type == F_UNLCK) {
4134                 if (state != NULL)
4135                         return nfs4_proc_unlck(state, cmd, request);
4136                 return 0;
4137         }
4138
4139         if (state == NULL)
4140                 return -ENOLCK;
4141         do {
4142                 status = nfs4_proc_setlk(state, cmd, request);
4143                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4144                         break;
4145                 timeout = nfs4_set_lock_task_retry(timeout);
4146                 status = -ERESTARTSYS;
4147                 if (signalled())
4148                         break;
4149         } while(status < 0);
4150         return status;
4151 }
4152
4153 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4154 {
4155         struct nfs_server *server = NFS_SERVER(state->inode);
4156         struct nfs4_exception exception = { };
4157         int err;
4158
4159         err = nfs4_set_lock_state(state, fl);
4160         if (err != 0)
4161                 goto out;
4162         do {
4163                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4164                 switch (err) {
4165                         default:
4166                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4167                                                 __func__, err);
4168                         case 0:
4169                         case -ESTALE:
4170                                 goto out;
4171                         case -NFS4ERR_EXPIRED:
4172                         case -NFS4ERR_STALE_CLIENTID:
4173                         case -NFS4ERR_STALE_STATEID:
4174                                 nfs4_schedule_state_recovery(server->nfs_client);
4175                                 goto out;
4176                         case -ERESTARTSYS:
4177                                 /*
4178                                  * The show must go on: exit, but mark the
4179                                  * stateid as needing recovery.
4180                                  */
4181                         case -NFS4ERR_ADMIN_REVOKED:
4182                         case -NFS4ERR_BAD_STATEID:
4183                         case -NFS4ERR_OPENMODE:
4184                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4185                                 err = 0;
4186                                 goto out;
4187                         case -ENOMEM:
4188                         case -NFS4ERR_DENIED:
4189                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4190                                 err = 0;
4191                                 goto out;
4192                         case -NFS4ERR_DELAY:
4193                                 break;
4194                 }
4195                 err = nfs4_handle_exception(server, err, &exception);
4196         } while (exception.retry);
4197 out:
4198         return err;
4199 }
4200
4201 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4202
4203 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4204                 size_t buflen, int flags)
4205 {
4206         struct inode *inode = dentry->d_inode;
4207
4208         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4209                 return -EOPNOTSUPP;
4210
4211         return nfs4_proc_set_acl(inode, buf, buflen);
4212 }
4213
4214 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4215  * and that's what we'll do for e.g. user attributes that haven't been set.
4216  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4217  * attributes in kernel-managed attribute namespaces. */
4218 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4219                 size_t buflen)
4220 {
4221         struct inode *inode = dentry->d_inode;
4222
4223         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4224                 return -EOPNOTSUPP;
4225
4226         return nfs4_proc_get_acl(inode, buf, buflen);
4227 }
4228
4229 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4230 {
4231         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4232
4233         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4234                 return 0;
4235         if (buf && buflen < len)
4236                 return -ERANGE;
4237         if (buf)
4238                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4239         return len;
4240 }
4241
4242 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4243 {
4244         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4245                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4246                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4247                 return;
4248
4249         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4250                 NFS_ATTR_FATTR_NLINK;
4251         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4252         fattr->nlink = 2;
4253 }
4254
4255 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4256                 struct nfs4_fs_locations *fs_locations, struct page *page)
4257 {
4258         struct nfs_server *server = NFS_SERVER(dir);
4259         u32 bitmask[2] = {
4260                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4261                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4262         };
4263         struct nfs4_fs_locations_arg args = {
4264                 .dir_fh = NFS_FH(dir),
4265                 .name = name,
4266                 .page = page,
4267                 .bitmask = bitmask,
4268         };
4269         struct nfs4_fs_locations_res res = {
4270                 .fs_locations = fs_locations,
4271         };
4272         struct rpc_message msg = {
4273                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4274                 .rpc_argp = &args,
4275                 .rpc_resp = &res,
4276         };
4277         int status;
4278
4279         dprintk("%s: start\n", __func__);
4280         nfs_fattr_init(&fs_locations->fattr);
4281         fs_locations->server = server;
4282         fs_locations->nlocations = 0;
4283         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4284         nfs_fixup_referral_attributes(&fs_locations->fattr);
4285         dprintk("%s: returned status = %d\n", __func__, status);
4286         return status;
4287 }
4288
4289 #ifdef CONFIG_NFS_V4_1
4290 /*
4291  * nfs4_proc_exchange_id()
4292  *
4293  * Since the clientid has expired, all compounds using sessions
4294  * associated with the stale clientid will be returning
4295  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4296  * be in some phase of session reset.
4297  */
4298 static int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4299 {
4300         nfs4_verifier verifier;
4301         struct nfs41_exchange_id_args args = {
4302                 .client = clp,
4303                 .flags = clp->cl_exchange_flags,
4304         };
4305         struct nfs41_exchange_id_res res = {
4306                 .client = clp,
4307         };
4308         int status;
4309         struct rpc_message msg = {
4310                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4311                 .rpc_argp = &args,
4312                 .rpc_resp = &res,
4313                 .rpc_cred = cred,
4314         };
4315         __be32 *p;
4316
4317         dprintk("--> %s\n", __func__);
4318         BUG_ON(clp == NULL);
4319
4320         p = (u32 *)verifier.data;
4321         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4322         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4323         args.verifier = &verifier;
4324
4325         while (1) {
4326                 args.id_len = scnprintf(args.id, sizeof(args.id),
4327                                         "%s/%s %u",
4328                                         clp->cl_ipaddr,
4329                                         rpc_peeraddr2str(clp->cl_rpcclient,
4330                                                          RPC_DISPLAY_ADDR),
4331                                         clp->cl_id_uniquifier);
4332
4333                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4334
4335                 if (status != NFS4ERR_CLID_INUSE)
4336                         break;
4337
4338                 if (signalled())
4339                         break;
4340
4341                 if (++clp->cl_id_uniquifier == 0)
4342                         break;
4343         }
4344
4345         dprintk("<-- %s status= %d\n", __func__, status);
4346         return status;
4347 }
4348
4349 struct nfs4_get_lease_time_data {
4350         struct nfs4_get_lease_time_args *args;
4351         struct nfs4_get_lease_time_res *res;
4352         struct nfs_client *clp;
4353 };
4354
4355 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4356                                         void *calldata)
4357 {
4358         int ret;
4359         struct nfs4_get_lease_time_data *data =
4360                         (struct nfs4_get_lease_time_data *)calldata;
4361
4362         dprintk("--> %s\n", __func__);
4363         /* just setup sequence, do not trigger session recovery
4364            since we're invoked within one */
4365         ret = nfs41_setup_sequence(data->clp->cl_session,
4366                                         &data->args->la_seq_args,
4367                                         &data->res->lr_seq_res, 0, task);
4368
4369         BUG_ON(ret == -EAGAIN);
4370         rpc_call_start(task);
4371         dprintk("<-- %s\n", __func__);
4372 }
4373
4374 /*
4375  * Called from nfs4_state_manager thread for session setup, so don't recover
4376  * from sequence operation or clientid errors.
4377  */
4378 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4379 {
4380         struct nfs4_get_lease_time_data *data =
4381                         (struct nfs4_get_lease_time_data *)calldata;
4382
4383         dprintk("--> %s\n", __func__);
4384         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4385         switch (task->tk_status) {
4386         case -NFS4ERR_DELAY:
4387         case -NFS4ERR_GRACE:
4388                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4389                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4390                 task->tk_status = 0;
4391                 nfs4_restart_rpc(task, data->clp);
4392                 return;
4393         }
4394         nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
4395         dprintk("<-- %s\n", __func__);
4396 }
4397
4398 struct rpc_call_ops nfs4_get_lease_time_ops = {
4399         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4400         .rpc_call_done = nfs4_get_lease_time_done,
4401 };
4402
4403 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4404 {
4405         struct rpc_task *task;
4406         struct nfs4_get_lease_time_args args;
4407         struct nfs4_get_lease_time_res res = {
4408                 .lr_fsinfo = fsinfo,
4409         };
4410         struct nfs4_get_lease_time_data data = {
4411                 .args = &args,
4412                 .res = &res,
4413                 .clp = clp,
4414         };
4415         struct rpc_message msg = {
4416                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4417                 .rpc_argp = &args,
4418                 .rpc_resp = &res,
4419         };
4420         struct rpc_task_setup task_setup = {
4421                 .rpc_client = clp->cl_rpcclient,
4422                 .rpc_message = &msg,
4423                 .callback_ops = &nfs4_get_lease_time_ops,
4424                 .callback_data = &data
4425         };
4426         int status;
4427
4428         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4429         dprintk("--> %s\n", __func__);
4430         task = rpc_run_task(&task_setup);
4431
4432         if (IS_ERR(task))
4433                 status = PTR_ERR(task);
4434         else {
4435                 status = task->tk_status;
4436                 rpc_put_task(task);
4437         }
4438         dprintk("<-- %s return %d\n", __func__, status);
4439
4440         return status;
4441 }
4442
4443 /*
4444  * Reset a slot table
4445  */
4446 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4447                 int old_max_slots, int ivalue)
4448 {
4449         int i;
4450         int ret = 0;
4451
4452         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4453
4454         /*
4455          * Until we have dynamic slot table adjustment, insist
4456          * upon the same slot table size
4457          */
4458         if (max_slots != old_max_slots) {
4459                 dprintk("%s reset slot table does't match old\n",
4460                         __func__);
4461                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4462                 goto out;
4463         }
4464         spin_lock(&tbl->slot_tbl_lock);
4465         for (i = 0; i < max_slots; ++i)
4466                 tbl->slots[i].seq_nr = ivalue;
4467         tbl->highest_used_slotid = -1;
4468         spin_unlock(&tbl->slot_tbl_lock);
4469         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4470                 tbl, tbl->slots, tbl->max_slots);
4471 out:
4472         dprintk("<-- %s: return %d\n", __func__, ret);
4473         return ret;
4474 }
4475
4476 /*
4477  * Reset the forechannel and backchannel slot tables
4478  */
4479 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4480 {
4481         int status;
4482
4483         status = nfs4_reset_slot_table(&session->fc_slot_table,
4484                         session->fc_attrs.max_reqs,
4485                         session->fc_slot_table.max_slots,
4486                         1);
4487         if (status)
4488                 return status;
4489
4490         status = nfs4_reset_slot_table(&session->bc_slot_table,
4491                         session->bc_attrs.max_reqs,
4492                         session->bc_slot_table.max_slots,
4493                         0);
4494         return status;
4495 }
4496
4497 /* Destroy the slot table */
4498 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4499 {
4500         if (session->fc_slot_table.slots != NULL) {
4501                 kfree(session->fc_slot_table.slots);
4502                 session->fc_slot_table.slots = NULL;
4503         }
4504         if (session->bc_slot_table.slots != NULL) {
4505                 kfree(session->bc_slot_table.slots);
4506                 session->bc_slot_table.slots = NULL;
4507         }
4508         return;
4509 }
4510
4511 /*
4512  * Initialize slot table
4513  */
4514 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4515                 int max_slots, int ivalue)
4516 {
4517         int i;
4518         struct nfs4_slot *slot;
4519         int ret = -ENOMEM;
4520
4521         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4522
4523         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4524
4525         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4526         if (!slot)
4527                 goto out;
4528         for (i = 0; i < max_slots; ++i)
4529                 slot[i].seq_nr = ivalue;
4530         ret = 0;
4531
4532         spin_lock(&tbl->slot_tbl_lock);
4533         if (tbl->slots != NULL) {
4534                 spin_unlock(&tbl->slot_tbl_lock);
4535                 dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
4536                         __func__, tbl, tbl->slots);
4537                 WARN_ON(1);
4538                 goto out_free;
4539         }
4540         tbl->max_slots = max_slots;
4541         tbl->slots = slot;
4542         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4543         spin_unlock(&tbl->slot_tbl_lock);
4544         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4545                 tbl, tbl->slots, tbl->max_slots);
4546 out:
4547         dprintk("<-- %s: return %d\n", __func__, ret);
4548         return ret;
4549
4550 out_free:
4551         kfree(slot);
4552         goto out;
4553 }
4554
4555 /*
4556  * Initialize the forechannel and backchannel tables
4557  */
4558 static int nfs4_init_slot_tables(struct nfs4_session *session)
4559 {
4560         int status;
4561
4562         status = nfs4_init_slot_table(&session->fc_slot_table,
4563                         session->fc_attrs.max_reqs, 1);
4564         if (status)
4565                 return status;
4566
4567         status = nfs4_init_slot_table(&session->bc_slot_table,
4568                         session->bc_attrs.max_reqs, 0);
4569         if (status)
4570                 nfs4_destroy_slot_tables(session);
4571
4572         return status;
4573 }
4574
4575 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4576 {
4577         struct nfs4_session *session;
4578         struct nfs4_slot_table *tbl;
4579
4580         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4581         if (!session)
4582                 return NULL;
4583
4584         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
4585         /*
4586          * The create session reply races with the server back
4587          * channel probe. Mark the client NFS_CS_SESSION_INITING
4588          * so that the client back channel can find the
4589          * nfs_client struct
4590          */
4591         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4592
4593         tbl = &session->fc_slot_table;
4594         spin_lock_init(&tbl->slot_tbl_lock);
4595         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4596
4597         tbl = &session->bc_slot_table;
4598         spin_lock_init(&tbl->slot_tbl_lock);
4599         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4600
4601         session->clp = clp;
4602         return session;
4603 }
4604
4605 void nfs4_destroy_session(struct nfs4_session *session)
4606 {
4607         nfs4_proc_destroy_session(session);
4608         dprintk("%s Destroy backchannel for xprt %p\n",
4609                 __func__, session->clp->cl_rpcclient->cl_xprt);
4610         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4611                                 NFS41_BC_MIN_CALLBACKS);
4612         nfs4_destroy_slot_tables(session);
4613         kfree(session);
4614 }
4615
4616 /*
4617  * Initialize the values to be used by the client in CREATE_SESSION
4618  * If nfs4_init_session set the fore channel request and response sizes,
4619  * use them.
4620  *
4621  * Set the back channel max_resp_sz_cached to zero to force the client to
4622  * always set csa_cachethis to FALSE because the current implementation
4623  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4624  */
4625 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4626 {
4627         struct nfs4_session *session = args->client->cl_session;
4628         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4629                      mxresp_sz = session->fc_attrs.max_resp_sz;
4630
4631         if (mxrqst_sz == 0)
4632                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4633         if (mxresp_sz == 0)
4634                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4635         /* Fore channel attributes */
4636         args->fc_attrs.headerpadsz = 0;
4637         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4638         args->fc_attrs.max_resp_sz = mxresp_sz;
4639         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4640         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4641         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4642
4643         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4644                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4645                 __func__,
4646                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4647                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4648                 args->fc_attrs.max_reqs);
4649
4650         /* Back channel attributes */
4651         args->bc_attrs.headerpadsz = 0;
4652         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4653         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4654         args->bc_attrs.max_resp_sz_cached = 0;
4655         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4656         args->bc_attrs.max_reqs = 1;
4657
4658         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4659                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4660                 __func__,
4661                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4662                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4663                 args->bc_attrs.max_reqs);
4664 }
4665
4666 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4667 {
4668         if (rcvd <= sent)
4669                 return 0;
4670         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4671                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4672         return -EINVAL;
4673 }
4674
4675 #define _verify_fore_channel_attr(_name_) \
4676         _verify_channel_attr("fore", #_name_, \
4677                              args->fc_attrs._name_, \
4678                              session->fc_attrs._name_)
4679
4680 #define _verify_back_channel_attr(_name_) \
4681         _verify_channel_attr("back", #_name_, \
4682                              args->bc_attrs._name_, \
4683                              session->bc_attrs._name_)
4684
4685 /*
4686  * The server is not allowed to increase the fore channel header pad size,
4687  * maximum response size, or maximum number of operations.
4688  *
4689  * The back channel attributes are only negotiatied down: We send what the
4690  * (back channel) server insists upon.
4691  */
4692 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4693                                      struct nfs4_session *session)
4694 {
4695         int ret = 0;
4696
4697         ret |= _verify_fore_channel_attr(headerpadsz);
4698         ret |= _verify_fore_channel_attr(max_resp_sz);
4699         ret |= _verify_fore_channel_attr(max_ops);
4700
4701         ret |= _verify_back_channel_attr(headerpadsz);
4702         ret |= _verify_back_channel_attr(max_rqst_sz);
4703         ret |= _verify_back_channel_attr(max_resp_sz);
4704         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4705         ret |= _verify_back_channel_attr(max_ops);
4706         ret |= _verify_back_channel_attr(max_reqs);
4707
4708         return ret;
4709 }
4710
4711 static int _nfs4_proc_create_session(struct nfs_client *clp)
4712 {
4713         struct nfs4_session *session = clp->cl_session;
4714         struct nfs41_create_session_args args = {
4715                 .client = clp,
4716                 .cb_program = NFS4_CALLBACK,
4717         };
4718         struct nfs41_create_session_res res = {
4719                 .client = clp,
4720         };
4721         struct rpc_message msg = {
4722                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4723                 .rpc_argp = &args,
4724                 .rpc_resp = &res,
4725         };
4726         int status;
4727
4728         nfs4_init_channel_attrs(&args);
4729         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4730
4731         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4732
4733         if (!status)
4734                 /* Verify the session's negotiated channel_attrs values */
4735                 status = nfs4_verify_channel_attrs(&args, session);
4736         if (!status) {
4737                 /* Increment the clientid slot sequence id */
4738                 clp->cl_seqid++;
4739         }
4740
4741         return status;
4742 }
4743
4744 /*
4745  * Issues a CREATE_SESSION operation to the server.
4746  * It is the responsibility of the caller to verify the session is
4747  * expired before calling this routine.
4748  */
4749 int nfs4_proc_create_session(struct nfs_client *clp, int reset)
4750 {
4751         int status;
4752         unsigned *ptr;
4753         struct nfs_fsinfo fsinfo;
4754         struct nfs4_session *session = clp->cl_session;
4755
4756         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4757
4758         status = _nfs4_proc_create_session(clp);
4759         if (status)
4760                 goto out;
4761
4762         /* Init or reset the fore channel */
4763         if (reset)
4764                 status = nfs4_reset_slot_tables(session);
4765         else
4766                 status = nfs4_init_slot_tables(session);
4767         dprintk("fore channel slot table initialization returned %d\n", status);
4768         if (status)
4769                 goto out;
4770
4771         ptr = (unsigned *)&session->sess_id.data[0];
4772         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4773                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4774
4775         if (reset)
4776                 /* Lease time is aleady set */
4777                 goto out;
4778
4779         /* Get the lease time */
4780         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4781         if (status == 0) {
4782                 /* Update lease time and schedule renewal */
4783                 spin_lock(&clp->cl_lock);
4784                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4785                 clp->cl_last_renewal = jiffies;
4786                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
4787                 spin_unlock(&clp->cl_lock);
4788
4789                 nfs4_schedule_state_renewal(clp);
4790         }
4791 out:
4792         dprintk("<-- %s\n", __func__);
4793         return status;
4794 }
4795
4796 /*
4797  * Issue the over-the-wire RPC DESTROY_SESSION.
4798  * The caller must serialize access to this routine.
4799  */
4800 int nfs4_proc_destroy_session(struct nfs4_session *session)
4801 {
4802         int status = 0;
4803         struct rpc_message msg;
4804
4805         dprintk("--> nfs4_proc_destroy_session\n");
4806
4807         /* session is still being setup */
4808         if (session->clp->cl_cons_state != NFS_CS_READY)
4809                 return status;
4810
4811         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4812         msg.rpc_argp = session;
4813         msg.rpc_resp = NULL;
4814         msg.rpc_cred = NULL;
4815         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4816
4817         if (status)
4818                 printk(KERN_WARNING
4819                         "Got error %d from the server on DESTROY_SESSION. "
4820                         "Session has been destroyed regardless...\n", status);
4821
4822         dprintk("<-- nfs4_proc_destroy_session\n");
4823         return status;
4824 }
4825
4826 int nfs4_init_session(struct nfs_server *server)
4827 {
4828         struct nfs_client *clp = server->nfs_client;
4829         int ret;
4830
4831         if (!nfs4_has_session(clp))
4832                 return 0;
4833
4834         clp->cl_session->fc_attrs.max_rqst_sz = server->wsize;
4835         clp->cl_session->fc_attrs.max_resp_sz = server->rsize;
4836         ret = nfs4_recover_expired_lease(server);
4837         if (!ret)
4838                 ret = nfs4_check_client_ready(clp);
4839         return ret;
4840 }
4841
4842 /*
4843  * Renew the cl_session lease.
4844  */
4845 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4846 {
4847         struct nfs4_sequence_args args;
4848         struct nfs4_sequence_res res;
4849
4850         struct rpc_message msg = {
4851                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4852                 .rpc_argp = &args,
4853                 .rpc_resp = &res,
4854                 .rpc_cred = cred,
4855         };
4856
4857         args.sa_cache_this = 0;
4858
4859         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4860                                        &res, 0);
4861 }
4862
4863 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4864 {
4865         struct nfs_client *clp = (struct nfs_client *)data;
4866
4867         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4868
4869         if (task->tk_status < 0) {
4870                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4871
4872                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4873                                                                 == -EAGAIN) {
4874                         nfs4_restart_rpc(task, clp);
4875                         return;
4876                 }
4877         }
4878         nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
4879         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4880
4881         put_rpccred(task->tk_msg.rpc_cred);
4882         kfree(task->tk_msg.rpc_argp);
4883         kfree(task->tk_msg.rpc_resp);
4884
4885         dprintk("<-- %s\n", __func__);
4886 }
4887
4888 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4889 {
4890         struct nfs_client *clp;
4891         struct nfs4_sequence_args *args;
4892         struct nfs4_sequence_res *res;
4893
4894         clp = (struct nfs_client *)data;
4895         args = task->tk_msg.rpc_argp;
4896         res = task->tk_msg.rpc_resp;
4897
4898         if (nfs4_setup_sequence(clp, args, res, 0, task))
4899                 return;
4900         rpc_call_start(task);
4901 }
4902
4903 static const struct rpc_call_ops nfs41_sequence_ops = {
4904         .rpc_call_done = nfs41_sequence_call_done,
4905         .rpc_call_prepare = nfs41_sequence_prepare,
4906 };
4907
4908 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4909                                      struct rpc_cred *cred)
4910 {
4911         struct nfs4_sequence_args *args;
4912         struct nfs4_sequence_res *res;
4913         struct rpc_message msg = {
4914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4915                 .rpc_cred = cred,
4916         };
4917
4918         args = kzalloc(sizeof(*args), GFP_KERNEL);
4919         if (!args)
4920                 return -ENOMEM;
4921         res = kzalloc(sizeof(*res), GFP_KERNEL);
4922         if (!res) {
4923                 kfree(args);
4924                 return -ENOMEM;
4925         }
4926         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4927         msg.rpc_argp = args;
4928         msg.rpc_resp = res;
4929
4930         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4931                               &nfs41_sequence_ops, (void *)clp);
4932 }
4933
4934 #endif /* CONFIG_NFS_V4_1 */
4935
4936 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
4937         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4938         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4939         .recover_open   = nfs4_open_reclaim,
4940         .recover_lock   = nfs4_lock_reclaim,
4941         .establish_clid = nfs4_init_clientid,
4942         .get_clid_cred  = nfs4_get_setclientid_cred,
4943 };
4944
4945 #if defined(CONFIG_NFS_V4_1)
4946 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
4947         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4948         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4949         .recover_open   = nfs4_open_reclaim,
4950         .recover_lock   = nfs4_lock_reclaim,
4951         .establish_clid = nfs4_proc_exchange_id,
4952         .get_clid_cred  = nfs4_get_exchange_id_cred,
4953 };
4954 #endif /* CONFIG_NFS_V4_1 */
4955
4956 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
4957         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4958         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4959         .recover_open   = nfs4_open_expired,
4960         .recover_lock   = nfs4_lock_expired,
4961         .establish_clid = nfs4_init_clientid,
4962         .get_clid_cred  = nfs4_get_setclientid_cred,
4963 };
4964
4965 #if defined(CONFIG_NFS_V4_1)
4966 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
4967         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4968         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4969         .recover_open   = nfs4_open_expired,
4970         .recover_lock   = nfs4_lock_expired,
4971         .establish_clid = nfs4_proc_exchange_id,
4972         .get_clid_cred  = nfs4_get_exchange_id_cred,
4973 };
4974 #endif /* CONFIG_NFS_V4_1 */
4975
4976 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
4977         .sched_state_renewal = nfs4_proc_async_renew,
4978         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
4979         .renew_lease = nfs4_proc_renew,
4980 };
4981
4982 #if defined(CONFIG_NFS_V4_1)
4983 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
4984         .sched_state_renewal = nfs41_proc_async_sequence,
4985         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
4986         .renew_lease = nfs4_proc_sequence,
4987 };
4988 #endif
4989
4990 /*
4991  * Per minor version reboot and network partition recovery ops
4992  */
4993
4994 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
4995         &nfs40_reboot_recovery_ops,
4996 #if defined(CONFIG_NFS_V4_1)
4997         &nfs41_reboot_recovery_ops,
4998 #endif
4999 };
5000
5001 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5002         &nfs40_nograce_recovery_ops,
5003 #if defined(CONFIG_NFS_V4_1)
5004         &nfs41_nograce_recovery_ops,
5005 #endif
5006 };
5007
5008 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5009         &nfs40_state_renewal_ops,
5010 #if defined(CONFIG_NFS_V4_1)
5011         &nfs41_state_renewal_ops,
5012 #endif
5013 };
5014
5015 static const struct inode_operations nfs4_file_inode_operations = {
5016         .permission     = nfs_permission,
5017         .getattr        = nfs_getattr,
5018         .setattr        = nfs_setattr,
5019         .getxattr       = nfs4_getxattr,
5020         .setxattr       = nfs4_setxattr,
5021         .listxattr      = nfs4_listxattr,
5022 };
5023
5024 const struct nfs_rpc_ops nfs_v4_clientops = {
5025         .version        = 4,                    /* protocol version */
5026         .dentry_ops     = &nfs4_dentry_operations,
5027         .dir_inode_ops  = &nfs4_dir_inode_operations,
5028         .file_inode_ops = &nfs4_file_inode_operations,
5029         .getroot        = nfs4_proc_get_root,
5030         .getattr        = nfs4_proc_getattr,
5031         .setattr        = nfs4_proc_setattr,
5032         .lookupfh       = nfs4_proc_lookupfh,
5033         .lookup         = nfs4_proc_lookup,
5034         .access         = nfs4_proc_access,
5035         .readlink       = nfs4_proc_readlink,
5036         .create         = nfs4_proc_create,
5037         .remove         = nfs4_proc_remove,
5038         .unlink_setup   = nfs4_proc_unlink_setup,
5039         .unlink_done    = nfs4_proc_unlink_done,
5040         .rename         = nfs4_proc_rename,
5041         .link           = nfs4_proc_link,
5042         .symlink        = nfs4_proc_symlink,
5043         .mkdir          = nfs4_proc_mkdir,
5044         .rmdir          = nfs4_proc_remove,
5045         .readdir        = nfs4_proc_readdir,
5046         .mknod          = nfs4_proc_mknod,
5047         .statfs         = nfs4_proc_statfs,
5048         .fsinfo         = nfs4_proc_fsinfo,
5049         .pathconf       = nfs4_proc_pathconf,
5050         .set_capabilities = nfs4_server_capabilities,
5051         .decode_dirent  = nfs4_decode_dirent,
5052         .read_setup     = nfs4_proc_read_setup,
5053         .read_done      = nfs4_read_done,
5054         .write_setup    = nfs4_proc_write_setup,
5055         .write_done     = nfs4_write_done,
5056         .commit_setup   = nfs4_proc_commit_setup,
5057         .commit_done    = nfs4_commit_done,
5058         .lock           = nfs4_proc_lock,
5059         .clear_acl_cache = nfs4_zap_acl_attr,
5060         .close_context  = nfs4_close_context,
5061 };
5062
5063 /*
5064  * Local variables:
5065  *  c-basic-offset: 8
5066  * End:
5067  */