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/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51 #include <linux/module.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57
  58 #define NFSDBG_FACILITY         NFSDBG_PROC
  59
  60 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  61 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  62
  63 struct nfs4_opendata;
  64 static int _nfs4_proc_open(struct nfs4_opendata *data);
  65 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  66 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 static int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __func__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 198 {
 199         int res;
 200
 201         might_sleep();
 202
 203         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 204                         nfs_wait_bit_killable, TASK_KILLABLE);
 205         return res;
 206 }
 207
 208 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 209 {
 210         int res = 0;
 211
 212         might_sleep();
 213
 214         if (*timeout <= 0)
 215                 *timeout = NFS4_POLL_RETRY_MIN;
 216         if (*timeout > NFS4_POLL_RETRY_MAX)
 217                 *timeout = NFS4_POLL_RETRY_MAX;
 218         schedule_timeout_killable(*timeout);
 219         if (fatal_signal_pending(current))
 220                 res = -ERESTARTSYS;
 221         *timeout <<= 1;
 222         return res;
 223 }
 224
 225 /* This is the error handling routine for processes that are allowed
 226  * to sleep.
 227  */
 228 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 229 {
 230         struct nfs_client *clp = server->nfs_client;
 231         struct nfs4_state *state = exception->state;
 232         int ret = errorcode;
 233
 234         exception->retry = 0;
 235         switch(errorcode) {
 236                 case 0:
 237                         return 0;
 238                 case -NFS4ERR_ADMIN_REVOKED:
 239                 case -NFS4ERR_BAD_STATEID:
 240                 case -NFS4ERR_OPENMODE:
 241                         if (state == NULL)
 242                                 break;
 243                         nfs4_state_mark_reclaim_nograce(clp, state);
 244                 case -NFS4ERR_STALE_CLIENTID:
 245                 case -NFS4ERR_STALE_STATEID:
 246                 case -NFS4ERR_EXPIRED:
 247                         nfs4_schedule_state_recovery(clp);
 248                         ret = nfs4_wait_clnt_recover(clp);
 249                         if (ret == 0)
 250                                 exception->retry = 1;
 251                         break;
 252                 case -NFS4ERR_FILE_OPEN:
 253                 case -NFS4ERR_GRACE:
 254                 case -NFS4ERR_DELAY:
 255                         ret = nfs4_delay(server->client, &exception->timeout);
 256                         if (ret != 0)
 257                                 break;
 258                 case -NFS4ERR_OLD_STATEID:
 259                         exception->retry = 1;
 260         }
 261         /* We failed to handle the error */
 262         return nfs4_map_errors(ret);
 263 }
 264
 265
 266 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 267 {
 268         struct nfs_client *clp = server->nfs_client;
 269         spin_lock(&clp->cl_lock);
 270         if (time_before(clp->cl_last_renewal,timestamp))
 271                 clp->cl_last_renewal = timestamp;
 272         spin_unlock(&clp->cl_lock);
 273 }
 274
 275 #if defined(CONFIG_NFS_V4_1)
 276
 277 /*
 278  * nfs4_free_slot - free a slot and efficiently update slot table.
 279  *
 280  * freeing a slot is trivially done by clearing its respective bit
 281  * in the bitmap.
 282  * If the freed slotid equals highest_used_slotid we want to update it
 283  * so that the server would be able to size down the slot table if needed,
 284  * otherwise we know that the highest_used_slotid is still in use.
 285  * When updating highest_used_slotid there may be "holes" in the bitmap
 286  * so we need to scan down from highest_used_slotid to 0 looking for the now
 287  * highest slotid in use.
 288  * If none found, highest_used_slotid is set to -1.
 289  */
 290 static void
 291 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 292 {
 293         int slotid = free_slotid;
 294
 295         spin_lock(&tbl->slot_tbl_lock);
 296         /* clear used bit in bitmap */
 297         __clear_bit(slotid, tbl->used_slots);
 298
 299         /* update highest_used_slotid when it is freed */
 300         if (slotid == tbl->highest_used_slotid) {
 301                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 302                 if (slotid >= 0 && slotid < tbl->max_slots)
 303                         tbl->highest_used_slotid = slotid;
 304                 else
 305                         tbl->highest_used_slotid = -1;
 306         }
 307         rpc_wake_up_next(&tbl->slot_tbl_waitq);
 308         spin_unlock(&tbl->slot_tbl_lock);
 309         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 310                 free_slotid, tbl->highest_used_slotid);
 311 }
 312
 313 void nfs41_sequence_free_slot(const struct nfs_client *clp,
 314                               struct nfs4_sequence_res *res)
 315 {
 316         struct nfs4_slot_table *tbl;
 317
 318         if (!nfs4_has_session(clp)) {
 319                 dprintk("%s: No session\n", __func__);
 320                 return;
 321         }
 322         tbl = &clp->cl_session->fc_slot_table;
 323         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 324                 dprintk("%s: No slot\n", __func__);
 325                 /* just wake up the next guy waiting since
 326                  * we may have not consumed a slot after all */
 327                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 328                 return;
 329         }
 330         nfs4_free_slot(tbl, res->sr_slotid);
 331         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 332 }
 333
 334 static void nfs41_sequence_done(struct nfs_client *clp,
 335                                 struct nfs4_sequence_res *res,
 336                                 int rpc_status)
 337 {
 338         unsigned long timestamp;
 339         struct nfs4_slot_table *tbl;
 340         struct nfs4_slot *slot;
 341
 342         /*
 343          * sr_status remains 1 if an RPC level error occurred. The server
 344          * may or may not have processed the sequence operation..
 345          * Proceed as if the server received and processed the sequence
 346          * operation.
 347          */
 348         if (res->sr_status == 1)
 349                 res->sr_status = NFS_OK;
 350
 351         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 352         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 353                 goto out;
 354
 355         tbl = &clp->cl_session->fc_slot_table;
 356         slot = tbl->slots + res->sr_slotid;
 357
 358         if (res->sr_status == 0) {
 359                 /* Update the slot's sequence and clientid lease timer */
 360                 ++slot->seq_nr;
 361                 timestamp = res->sr_renewal_time;
 362                 spin_lock(&clp->cl_lock);
 363                 if (time_before(clp->cl_last_renewal, timestamp))
 364                         clp->cl_last_renewal = timestamp;
 365                 spin_unlock(&clp->cl_lock);
 366                 return;
 367         }
 368 out:
 369         /* The session may be reset by one of the error handlers. */
 370         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 371         nfs41_sequence_free_slot(clp, res);
 372 }
 373
 374 /*
 375  * nfs4_find_slot - efficiently look for a free slot
 376  *
 377  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 378  * If found, we mark the slot as used, update the highest_used_slotid,
 379  * and respectively set up the sequence operation args.
 380  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 381  *
 382  * Note: must be called with under the slot_tbl_lock.
 383  */
 384 static u8
 385 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
 386 {
 387         int slotid;
 388         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 389         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 390
 391         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 392                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 393                 tbl->max_slots);
 394         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 395         if (slotid >= tbl->max_slots)
 396                 goto out;
 397         __set_bit(slotid, tbl->used_slots);
 398         if (slotid > tbl->highest_used_slotid)
 399                 tbl->highest_used_slotid = slotid;
 400         ret_id = slotid;
 401 out:
 402         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 403                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 404         return ret_id;
 405 }
 406
 407 static int nfs41_setup_sequence(struct nfs4_session *session,
 408                                 struct nfs4_sequence_args *args,
 409                                 struct nfs4_sequence_res *res,
 410                                 int cache_reply,
 411                                 struct rpc_task *task)
 412 {
 413         struct nfs4_slot *slot;
 414         struct nfs4_slot_table *tbl;
 415         u8 slotid;
 416
 417         dprintk("--> %s\n", __func__);
 418         /* slot already allocated? */
 419         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 420                 return 0;
 421
 422         memset(res, 0, sizeof(*res));
 423         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 424         tbl = &session->fc_slot_table;
 425
 426         spin_lock(&tbl->slot_tbl_lock);
 427         slotid = nfs4_find_slot(tbl, task);
 428         if (slotid == NFS4_MAX_SLOT_TABLE) {
 429                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 430                 spin_unlock(&tbl->slot_tbl_lock);
 431                 dprintk("<-- %s: no free slots\n", __func__);
 432                 return -EAGAIN;
 433         }
 434         spin_unlock(&tbl->slot_tbl_lock);
 435
 436         slot = tbl->slots + slotid;
 437         args->sa_session = session;
 438         args->sa_slotid = slotid;
 439         args->sa_cache_this = cache_reply;
 440
 441         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 442
 443         res->sr_session = session;
 444         res->sr_slotid = slotid;
 445         res->sr_renewal_time = jiffies;
 446         /*
 447          * sr_status is only set in decode_sequence, and so will remain
 448          * set to 1 if an rpc level failure occurs.
 449          */
 450         res->sr_status = 1;
 451         return 0;
 452 }
 453
 454 int nfs4_setup_sequence(struct nfs_client *clp,
 455                         struct nfs4_sequence_args *args,
 456                         struct nfs4_sequence_res *res,
 457                         int cache_reply,
 458                         struct rpc_task *task)
 459 {
 460         int ret = 0;
 461
 462         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 463                 __func__, clp, clp->cl_session, res->sr_slotid);
 464
 465         if (!nfs4_has_session(clp))
 466                 goto out;
 467         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
 468                                    task);
 469         if (ret != -EAGAIN) {
 470                 /* terminate rpc task */
 471                 task->tk_status = ret;
 472                 task->tk_action = NULL;
 473         }
 474 out:
 475         dprintk("<-- %s status=%d\n", __func__, ret);
 476         return ret;
 477 }
 478
 479 struct nfs41_call_sync_data {
 480         struct nfs_client *clp;
 481         struct nfs4_sequence_args *seq_args;
 482         struct nfs4_sequence_res *seq_res;
 483         int cache_reply;
 484 };
 485
 486 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 487 {
 488         struct nfs41_call_sync_data *data = calldata;
 489
 490         dprintk("--> %s data->clp->cl_session %p\n", __func__,
 491                 data->clp->cl_session);
 492         if (nfs4_setup_sequence(data->clp, data->seq_args,
 493                                 data->seq_res, data->cache_reply, task))
 494                 return;
 495         rpc_call_start(task);
 496 }
 497
 498 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 499 {
 500         struct nfs41_call_sync_data *data = calldata;
 501
 502         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
 503         nfs41_sequence_free_slot(data->clp, data->seq_res);
 504 }
 505
 506 struct rpc_call_ops nfs41_call_sync_ops = {
 507         .rpc_call_prepare = nfs41_call_sync_prepare,
 508         .rpc_call_done = nfs41_call_sync_done,
 509 };
 510
 511 static int nfs4_call_sync_sequence(struct nfs_client *clp,
 512                                    struct rpc_clnt *clnt,
 513                                    struct rpc_message *msg,
 514                                    struct nfs4_sequence_args *args,
 515                                    struct nfs4_sequence_res *res,
 516                                    int cache_reply)
 517 {
 518         int ret;
 519         struct rpc_task *task;
 520         struct nfs41_call_sync_data data = {
 521                 .clp = clp,
 522                 .seq_args = args,
 523                 .seq_res = res,
 524                 .cache_reply = cache_reply,
 525         };
 526         struct rpc_task_setup task_setup = {
 527                 .rpc_client = clnt,
 528                 .rpc_message = msg,
 529                 .callback_ops = &nfs41_call_sync_ops,
 530                 .callback_data = &data
 531         };
 532
 533         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 534         task = rpc_run_task(&task_setup);
 535         if (IS_ERR(task))
 536                 ret = PTR_ERR(task);
 537         else {
 538                 ret = task->tk_status;
 539                 rpc_put_task(task);
 540         }
 541         return ret;
 542 }
 543
 544 int _nfs4_call_sync_session(struct nfs_server *server,
 545                             struct rpc_message *msg,
 546                             struct nfs4_sequence_args *args,
 547                             struct nfs4_sequence_res *res,
 548                             int cache_reply)
 549 {
 550         return nfs4_call_sync_sequence(server->nfs_client, server->client,
 551                                        msg, args, res, cache_reply);
 552 }
 553
 554 #endif /* CONFIG_NFS_V4_1 */
 555
 556 int _nfs4_call_sync(struct nfs_server *server,
 557                     struct rpc_message *msg,
 558                     struct nfs4_sequence_args *args,
 559                     struct nfs4_sequence_res *res,
 560                     int cache_reply)
 561 {
 562         args->sa_session = res->sr_session = NULL;
 563         return rpc_call_sync(server->client, msg, 0);
 564 }
 565
 566 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 567         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 568                         &(res)->seq_res, (cache_reply))
 569
 570 static void nfs4_sequence_done(const struct nfs_server *server,
 571                                struct nfs4_sequence_res *res, int rpc_status)
 572 {
 573 #ifdef CONFIG_NFS_V4_1
 574         if (nfs4_has_session(server->nfs_client))
 575                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
 576 #endif /* CONFIG_NFS_V4_1 */
 577 }
 578
 579 /* no restart, therefore free slot here */
 580 static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
 581                                          struct nfs4_sequence_res *res,
 582                                          int rpc_status)
 583 {
 584         nfs4_sequence_done(server, res, rpc_status);
 585         nfs4_sequence_free_slot(server->nfs_client, res);
 586 }
 587
 588 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 589 {
 590         struct nfs_inode *nfsi = NFS_I(dir);
 591
 592         spin_lock(&dir->i_lock);
 593         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 594         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 595                 nfs_force_lookup_revalidate(dir);
 596         nfsi->change_attr = cinfo->after;
 597         spin_unlock(&dir->i_lock);
 598 }
 599
 600 struct nfs4_opendata {
 601         struct kref kref;
 602         struct nfs_openargs o_arg;
 603         struct nfs_openres o_res;
 604         struct nfs_open_confirmargs c_arg;
 605         struct nfs_open_confirmres c_res;
 606         struct nfs_fattr f_attr;
 607         struct nfs_fattr dir_attr;
 608         struct path path;
 609         struct dentry *dir;
 610         struct nfs4_state_owner *owner;
 611         struct nfs4_state *state;
 612         struct iattr attrs;
 613         unsigned long timestamp;
 614         unsigned int rpc_done : 1;
 615         int rpc_status;
 616         int cancelled;
 617 };
 618
 619
 620 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 621 {
 622         p->o_res.f_attr = &p->f_attr;
 623         p->o_res.dir_attr = &p->dir_attr;
 624         p->o_res.seqid = p->o_arg.seqid;
 625         p->c_res.seqid = p->c_arg.seqid;
 626         p->o_res.server = p->o_arg.server;
 627         nfs_fattr_init(&p->f_attr);
 628         nfs_fattr_init(&p->dir_attr);
 629 }
 630
 631 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 632                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 633                 const struct iattr *attrs)
 634 {
 635         struct dentry *parent = dget_parent(path->dentry);
 636         struct inode *dir = parent->d_inode;
 637         struct nfs_server *server = NFS_SERVER(dir);
 638         struct nfs4_opendata *p;
 639
 640         p = kzalloc(sizeof(*p), GFP_KERNEL);
 641         if (p == NULL)
 642                 goto err;
 643         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 644         if (p->o_arg.seqid == NULL)
 645                 goto err_free;
 646         p->path.mnt = mntget(path->mnt);
 647         p->path.dentry = dget(path->dentry);
 648         p->dir = parent;
 649         p->owner = sp;
 650         atomic_inc(&sp->so_count);
 651         p->o_arg.fh = NFS_FH(dir);
 652         p->o_arg.open_flags = flags;
 653         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 654         p->o_arg.clientid = server->nfs_client->cl_clientid;
 655         p->o_arg.id = sp->so_owner_id.id;
 656         p->o_arg.name = &p->path.dentry->d_name;
 657         p->o_arg.server = server;
 658         p->o_arg.bitmask = server->attr_bitmask;
 659         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 660         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 661         if (flags & O_EXCL) {
 662                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 663                 s[0] = jiffies;
 664                 s[1] = current->pid;
 665         } else if (flags & O_CREAT) {
 666                 p->o_arg.u.attrs = &p->attrs;
 667                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 668         }
 669         p->c_arg.fh = &p->o_res.fh;
 670         p->c_arg.stateid = &p->o_res.stateid;
 671         p->c_arg.seqid = p->o_arg.seqid;
 672         nfs4_init_opendata_res(p);
 673         kref_init(&p->kref);
 674         return p;
 675 err_free:
 676         kfree(p);
 677 err:
 678         dput(parent);
 679         return NULL;
 680 }
 681
 682 static void nfs4_opendata_free(struct kref *kref)
 683 {
 684         struct nfs4_opendata *p = container_of(kref,
 685                         struct nfs4_opendata, kref);
 686
 687         nfs_free_seqid(p->o_arg.seqid);
 688         if (p->state != NULL)
 689                 nfs4_put_open_state(p->state);
 690         nfs4_put_state_owner(p->owner);
 691         dput(p->dir);
 692         path_put(&p->path);
 693         kfree(p);
 694 }
 695
 696 static void nfs4_opendata_put(struct nfs4_opendata *p)
 697 {
 698         if (p != NULL)
 699                 kref_put(&p->kref, nfs4_opendata_free);
 700 }
 701
 702 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 703 {
 704         int ret;
 705
 706         ret = rpc_wait_for_completion_task(task);
 707         return ret;
 708 }
 709
 710 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 711 {
 712         int ret = 0;
 713
 714         if (open_mode & O_EXCL)
 715                 goto out;
 716         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 717                 case FMODE_READ:
 718                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 719                         break;
 720                 case FMODE_WRITE:
 721                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 722                         break;
 723                 case FMODE_READ|FMODE_WRITE:
 724                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 725         }
 726 out:
 727         return ret;
 728 }
 729
 730 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 731 {
 732         if ((delegation->type & fmode) != fmode)
 733                 return 0;
 734         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 735                 return 0;
 736         nfs_mark_delegation_referenced(delegation);
 737         return 1;
 738 }
 739
 740 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 741 {
 742         switch (fmode) {
 743                 case FMODE_WRITE:
 744                         state->n_wronly++;
 745                         break;
 746                 case FMODE_READ:
 747                         state->n_rdonly++;
 748                         break;
 749                 case FMODE_READ|FMODE_WRITE:
 750                         state->n_rdwr++;
 751         }
 752         nfs4_state_set_mode_locked(state, state->state | fmode);
 753 }
 754
 755 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 756 {
 757         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 758                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 759         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 760         switch (fmode) {
 761                 case FMODE_READ:
 762                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 763                         break;
 764                 case FMODE_WRITE:
 765                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 766                         break;
 767                 case FMODE_READ|FMODE_WRITE:
 768                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 769         }
 770 }
 771
 772 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 773 {
 774         write_seqlock(&state->seqlock);
 775         nfs_set_open_stateid_locked(state, stateid, fmode);
 776         write_sequnlock(&state->seqlock);
 777 }
 778
 779 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 780 {
 781         /*
 782          * Protect the call to nfs4_state_set_mode_locked and
 783          * serialise the stateid update
 784          */
 785         write_seqlock(&state->seqlock);
 786         if (deleg_stateid != NULL) {
 787                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 788                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 789         }
 790         if (open_stateid != NULL)
 791                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 792         write_sequnlock(&state->seqlock);
 793         spin_lock(&state->owner->so_lock);
 794         update_open_stateflags(state, fmode);
 795         spin_unlock(&state->owner->so_lock);
 796 }
 797
 798 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 799 {
 800         struct nfs_inode *nfsi = NFS_I(state->inode);
 801         struct nfs_delegation *deleg_cur;
 802         int ret = 0;
 803
 804         fmode &= (FMODE_READ|FMODE_WRITE);
 805
 806         rcu_read_lock();
 807         deleg_cur = rcu_dereference(nfsi->delegation);
 808         if (deleg_cur == NULL)
 809                 goto no_delegation;
 810
 811         spin_lock(&deleg_cur->lock);
 812         if (nfsi->delegation != deleg_cur ||
 813             (deleg_cur->type & fmode) != fmode)
 814                 goto no_delegation_unlock;
 815
 816         if (delegation == NULL)
 817                 delegation = &deleg_cur->stateid;
 818         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 819                 goto no_delegation_unlock;
 820
 821         nfs_mark_delegation_referenced(deleg_cur);
 822         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 823         ret = 1;
 824 no_delegation_unlock:
 825         spin_unlock(&deleg_cur->lock);
 826 no_delegation:
 827         rcu_read_unlock();
 828
 829         if (!ret && open_stateid != NULL) {
 830                 __update_open_stateid(state, open_stateid, NULL, fmode);
 831                 ret = 1;
 832         }
 833
 834         return ret;
 835 }
 836
 837
 838 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 839 {
 840         struct nfs_delegation *delegation;
 841
 842         rcu_read_lock();
 843         delegation = rcu_dereference(NFS_I(inode)->delegation);
 844         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 845                 rcu_read_unlock();
 846                 return;
 847         }
 848         rcu_read_unlock();
 849         nfs_inode_return_delegation(inode);
 850 }
 851
 852 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 853 {
 854         struct nfs4_state *state = opendata->state;
 855         struct nfs_inode *nfsi = NFS_I(state->inode);
 856         struct nfs_delegation *delegation;
 857         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 858         fmode_t fmode = opendata->o_arg.fmode;
 859         nfs4_stateid stateid;
 860         int ret = -EAGAIN;
 861
 862         for (;;) {
 863                 if (can_open_cached(state, fmode, open_mode)) {
 864                         spin_lock(&state->owner->so_lock);
 865                         if (can_open_cached(state, fmode, open_mode)) {
 866                                 update_open_stateflags(state, fmode);
 867                                 spin_unlock(&state->owner->so_lock);
 868                                 goto out_return_state;
 869                         }
 870                         spin_unlock(&state->owner->so_lock);
 871                 }
 872                 rcu_read_lock();
 873                 delegation = rcu_dereference(nfsi->delegation);
 874                 if (delegation == NULL ||
 875                     !can_open_delegated(delegation, fmode)) {
 876                         rcu_read_unlock();
 877                         break;
 878                 }
 879                 /* Save the delegation */
 880                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 881                 rcu_read_unlock();
 882                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 883                 if (ret != 0)
 884                         goto out;
 885                 ret = -EAGAIN;
 886
 887                 /* Try to update the stateid using the delegation */
 888                 if (update_open_stateid(state, NULL, &stateid, fmode))
 889                         goto out_return_state;
 890         }
 891 out:
 892         return ERR_PTR(ret);
 893 out_return_state:
 894         atomic_inc(&state->count);
 895         return state;
 896 }
 897
 898 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 899 {
 900         struct inode *inode;
 901         struct nfs4_state *state = NULL;
 902         struct nfs_delegation *delegation;
 903         int ret;
 904
 905         if (!data->rpc_done) {
 906                 state = nfs4_try_open_cached(data);
 907                 goto out;
 908         }
 909
 910         ret = -EAGAIN;
 911         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 912                 goto err;
 913         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 914         ret = PTR_ERR(inode);
 915         if (IS_ERR(inode))
 916                 goto err;
 917         ret = -ENOMEM;
 918         state = nfs4_get_open_state(inode, data->owner);
 919         if (state == NULL)
 920                 goto err_put_inode;
 921         if (data->o_res.delegation_type != 0) {
 922                 int delegation_flags = 0;
 923
 924                 rcu_read_lock();
 925                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 926                 if (delegation)
 927                         delegation_flags = delegation->flags;
 928                 rcu_read_unlock();
 929                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 930                         nfs_inode_set_delegation(state->inode,
 931                                         data->owner->so_cred,
 932                                         &data->o_res);
 933                 else
 934                         nfs_inode_reclaim_delegation(state->inode,
 935                                         data->owner->so_cred,
 936                                         &data->o_res);
 937         }
 938
 939         update_open_stateid(state, &data->o_res.stateid, NULL,
 940                         data->o_arg.fmode);
 941         iput(inode);
 942 out:
 943         return state;
 944 err_put_inode:
 945         iput(inode);
 946 err:
 947         return ERR_PTR(ret);
 948 }
 949
 950 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 951 {
 952         struct nfs_inode *nfsi = NFS_I(state->inode);
 953         struct nfs_open_context *ctx;
 954
 955         spin_lock(&state->inode->i_lock);
 956         list_for_each_entry(ctx, &nfsi->open_files, list) {
 957                 if (ctx->state != state)
 958                         continue;
 959                 get_nfs_open_context(ctx);
 960                 spin_unlock(&state->inode->i_lock);
 961                 return ctx;
 962         }
 963         spin_unlock(&state->inode->i_lock);
 964         return ERR_PTR(-ENOENT);
 965 }
 966
 967 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 968 {
 969         struct nfs4_opendata *opendata;
 970
 971         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
 972         if (opendata == NULL)
 973                 return ERR_PTR(-ENOMEM);
 974         opendata->state = state;
 975         atomic_inc(&state->count);
 976         return opendata;
 977 }
 978
 979 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
 980 {
 981         struct nfs4_state *newstate;
 982         int ret;
 983
 984         opendata->o_arg.open_flags = 0;
 985         opendata->o_arg.fmode = fmode;
 986         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 987         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 988         nfs4_init_opendata_res(opendata);
 989         ret = _nfs4_proc_open(opendata);
 990         if (ret != 0)
 991                 return ret;
 992         newstate = nfs4_opendata_to_nfs4_state(opendata);
 993         if (IS_ERR(newstate))
 994                 return PTR_ERR(newstate);
 995         nfs4_close_state(&opendata->path, newstate, fmode);
 996         *res = newstate;
 997         return 0;
 998 }
 999
1000 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1001 {
1002         struct nfs4_state *newstate;
1003         int ret;
1004
1005         /* memory barrier prior to reading state->n_* */
1006         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1007         smp_rmb();
1008         if (state->n_rdwr != 0) {
1009                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1010                 if (ret != 0)
1011                         return ret;
1012                 if (newstate != state)
1013                         return -ESTALE;
1014         }
1015         if (state->n_wronly != 0) {
1016                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1017                 if (ret != 0)
1018                         return ret;
1019                 if (newstate != state)
1020                         return -ESTALE;
1021         }
1022         if (state->n_rdonly != 0) {
1023                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1024                 if (ret != 0)
1025                         return ret;
1026                 if (newstate != state)
1027                         return -ESTALE;
1028         }
1029         /*
1030          * We may have performed cached opens for all three recoveries.
1031          * Check if we need to update the current stateid.
1032          */
1033         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1034             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1035                 write_seqlock(&state->seqlock);
1036                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1037                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1038                 write_sequnlock(&state->seqlock);
1039         }
1040         return 0;
1041 }
1042
1043 /*
1044  * OPEN_RECLAIM:
1045  *      reclaim state on the server after a reboot.
1046  */
1047 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1048 {
1049         struct nfs_delegation *delegation;
1050         struct nfs4_opendata *opendata;
1051         fmode_t delegation_type = 0;
1052         int status;
1053
1054         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1055         if (IS_ERR(opendata))
1056                 return PTR_ERR(opendata);
1057         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1058         opendata->o_arg.fh = NFS_FH(state->inode);
1059         rcu_read_lock();
1060         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1061         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1062                 delegation_type = delegation->type;
1063         rcu_read_unlock();
1064         opendata->o_arg.u.delegation_type = delegation_type;
1065         status = nfs4_open_recover(opendata, state);
1066         nfs4_opendata_put(opendata);
1067         return status;
1068 }
1069
1070 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1071 {
1072         struct nfs_server *server = NFS_SERVER(state->inode);
1073         struct nfs4_exception exception = { };
1074         int err;
1075         do {
1076                 err = _nfs4_do_open_reclaim(ctx, state);
1077                 if (err != -NFS4ERR_DELAY)
1078                         break;
1079                 nfs4_handle_exception(server, err, &exception);
1080         } while (exception.retry);
1081         return err;
1082 }
1083
1084 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1085 {
1086         struct nfs_open_context *ctx;
1087         int ret;
1088
1089         ctx = nfs4_state_find_open_context(state);
1090         if (IS_ERR(ctx))
1091                 return PTR_ERR(ctx);
1092         ret = nfs4_do_open_reclaim(ctx, state);
1093         put_nfs_open_context(ctx);
1094         return ret;
1095 }
1096
1097 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1098 {
1099         struct nfs4_opendata *opendata;
1100         int ret;
1101
1102         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1103         if (IS_ERR(opendata))
1104                 return PTR_ERR(opendata);
1105         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1106         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1107                         sizeof(opendata->o_arg.u.delegation.data));
1108         ret = nfs4_open_recover(opendata, state);
1109         nfs4_opendata_put(opendata);
1110         return ret;
1111 }
1112
1113 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1114 {
1115         struct nfs4_exception exception = { };
1116         struct nfs_server *server = NFS_SERVER(state->inode);
1117         int err;
1118         do {
1119                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1120                 switch (err) {
1121                         case 0:
1122                                 return err;
1123                         case -NFS4ERR_STALE_CLIENTID:
1124                         case -NFS4ERR_STALE_STATEID:
1125                         case -NFS4ERR_EXPIRED:
1126                                 /* Don't recall a delegation if it was lost */
1127                                 nfs4_schedule_state_recovery(server->nfs_client);
1128                                 return err;
1129                 }
1130                 err = nfs4_handle_exception(server, err, &exception);
1131         } while (exception.retry);
1132         return err;
1133 }
1134
1135 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1136 {
1137         struct nfs4_opendata *data = calldata;
1138
1139         data->rpc_status = task->tk_status;
1140         if (RPC_ASSASSINATED(task))
1141                 return;
1142         if (data->rpc_status == 0) {
1143                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1144                                 sizeof(data->o_res.stateid.data));
1145                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1146                 renew_lease(data->o_res.server, data->timestamp);
1147                 data->rpc_done = 1;
1148         }
1149 }
1150
1151 static void nfs4_open_confirm_release(void *calldata)
1152 {
1153         struct nfs4_opendata *data = calldata;
1154         struct nfs4_state *state = NULL;
1155
1156         /* If this request hasn't been cancelled, do nothing */
1157         if (data->cancelled == 0)
1158                 goto out_free;
1159         /* In case of error, no cleanup! */
1160         if (!data->rpc_done)
1161                 goto out_free;
1162         state = nfs4_opendata_to_nfs4_state(data);
1163         if (!IS_ERR(state))
1164                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1165 out_free:
1166         nfs4_opendata_put(data);
1167 }
1168
1169 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1170         .rpc_call_done = nfs4_open_confirm_done,
1171         .rpc_release = nfs4_open_confirm_release,
1172 };
1173
1174 /*
1175  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1176  */
1177 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1178 {
1179         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1180         struct rpc_task *task;
1181         struct  rpc_message msg = {
1182                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1183                 .rpc_argp = &data->c_arg,
1184                 .rpc_resp = &data->c_res,
1185                 .rpc_cred = data->owner->so_cred,
1186         };
1187         struct rpc_task_setup task_setup_data = {
1188                 .rpc_client = server->client,
1189                 .rpc_message = &msg,
1190                 .callback_ops = &nfs4_open_confirm_ops,
1191                 .callback_data = data,
1192                 .workqueue = nfsiod_workqueue,
1193                 .flags = RPC_TASK_ASYNC,
1194         };
1195         int status;
1196
1197         kref_get(&data->kref);
1198         data->rpc_done = 0;
1199         data->rpc_status = 0;
1200         data->timestamp = jiffies;
1201         task = rpc_run_task(&task_setup_data);
1202         if (IS_ERR(task))
1203                 return PTR_ERR(task);
1204         status = nfs4_wait_for_completion_rpc_task(task);
1205         if (status != 0) {
1206                 data->cancelled = 1;
1207                 smp_wmb();
1208         } else
1209                 status = data->rpc_status;
1210         rpc_put_task(task);
1211         return status;
1212 }
1213
1214 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1215 {
1216         struct nfs4_opendata *data = calldata;
1217         struct nfs4_state_owner *sp = data->owner;
1218
1219         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1220                 return;
1221         /*
1222          * Check if we still need to send an OPEN call, or if we can use
1223          * a delegation instead.
1224          */
1225         if (data->state != NULL) {
1226                 struct nfs_delegation *delegation;
1227
1228                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1229                         goto out_no_action;
1230                 rcu_read_lock();
1231                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1232                 if (delegation != NULL &&
1233                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1234                         rcu_read_unlock();
1235                         goto out_no_action;
1236                 }
1237                 rcu_read_unlock();
1238         }
1239         /* Update sequence id. */
1240         data->o_arg.id = sp->so_owner_id.id;
1241         data->o_arg.clientid = sp->so_client->cl_clientid;
1242         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1243                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1244                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1245         }
1246         data->timestamp = jiffies;
1247         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1248                                 &data->o_arg.seq_args,
1249                                 &data->o_res.seq_res, 1, task))
1250                 return;
1251         rpc_call_start(task);
1252         return;
1253 out_no_action:
1254         task->tk_action = NULL;
1255
1256 }
1257
1258 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1259 {
1260         struct nfs4_opendata *data = calldata;
1261
1262         data->rpc_status = task->tk_status;
1263
1264         nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
1265                                      task->tk_status);
1266
1267         if (RPC_ASSASSINATED(task))
1268                 return;
1269         if (task->tk_status == 0) {
1270                 switch (data->o_res.f_attr->mode & S_IFMT) {
1271                         case S_IFREG:
1272                                 break;
1273                         case S_IFLNK:
1274                                 data->rpc_status = -ELOOP;
1275                                 break;
1276                         case S_IFDIR:
1277                                 data->rpc_status = -EISDIR;
1278                                 break;
1279                         default:
1280                                 data->rpc_status = -ENOTDIR;
1281                 }
1282                 renew_lease(data->o_res.server, data->timestamp);
1283                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1284                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1285         }
1286         data->rpc_done = 1;
1287 }
1288
1289 static void nfs4_open_release(void *calldata)
1290 {
1291         struct nfs4_opendata *data = calldata;
1292         struct nfs4_state *state = NULL;
1293
1294         /* If this request hasn't been cancelled, do nothing */
1295         if (data->cancelled == 0)
1296                 goto out_free;
1297         /* In case of error, no cleanup! */
1298         if (data->rpc_status != 0 || !data->rpc_done)
1299                 goto out_free;
1300         /* In case we need an open_confirm, no cleanup! */
1301         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1302                 goto out_free;
1303         state = nfs4_opendata_to_nfs4_state(data);
1304         if (!IS_ERR(state))
1305                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1306 out_free:
1307         nfs4_opendata_put(data);
1308 }
1309
1310 static const struct rpc_call_ops nfs4_open_ops = {
1311         .rpc_call_prepare = nfs4_open_prepare,
1312         .rpc_call_done = nfs4_open_done,
1313         .rpc_release = nfs4_open_release,
1314 };
1315
1316 /*
1317  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1318  */
1319 static int _nfs4_proc_open(struct nfs4_opendata *data)
1320 {
1321         struct inode *dir = data->dir->d_inode;
1322         struct nfs_server *server = NFS_SERVER(dir);
1323         struct nfs_openargs *o_arg = &data->o_arg;
1324         struct nfs_openres *o_res = &data->o_res;
1325         struct rpc_task *task;
1326         struct rpc_message msg = {
1327                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1328                 .rpc_argp = o_arg,
1329                 .rpc_resp = o_res,
1330                 .rpc_cred = data->owner->so_cred,
1331         };
1332         struct rpc_task_setup task_setup_data = {
1333                 .rpc_client = server->client,
1334                 .rpc_message = &msg,
1335                 .callback_ops = &nfs4_open_ops,
1336                 .callback_data = data,
1337                 .workqueue = nfsiod_workqueue,
1338                 .flags = RPC_TASK_ASYNC,
1339         };
1340         int status;
1341
1342         kref_get(&data->kref);
1343         data->rpc_done = 0;
1344         data->rpc_status = 0;
1345         data->cancelled = 0;
1346         task = rpc_run_task(&task_setup_data);
1347         if (IS_ERR(task))
1348                 return PTR_ERR(task);
1349         status = nfs4_wait_for_completion_rpc_task(task);
1350         if (status != 0) {
1351                 data->cancelled = 1;
1352                 smp_wmb();
1353         } else
1354                 status = data->rpc_status;
1355         rpc_put_task(task);
1356         if (status != 0 || !data->rpc_done)
1357                 return status;
1358
1359         if (o_res->fh.size == 0)
1360                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1361
1362         if (o_arg->open_flags & O_CREAT) {
1363                 update_changeattr(dir, &o_res->cinfo);
1364                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1365         } else
1366                 nfs_refresh_inode(dir, o_res->dir_attr);
1367         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1368                 status = _nfs4_proc_open_confirm(data);
1369                 if (status != 0)
1370                         return status;
1371         }
1372         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1373                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1374         return 0;
1375 }
1376
1377 static int nfs4_recover_expired_lease(struct nfs_server *server)
1378 {
1379         struct nfs_client *clp = server->nfs_client;
1380         int ret;
1381
1382         for (;;) {
1383                 ret = nfs4_wait_clnt_recover(clp);
1384                 if (ret != 0)
1385                         return ret;
1386                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1387                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1388                         break;
1389                 nfs4_schedule_state_recovery(clp);
1390         }
1391         return 0;
1392 }
1393
1394 /*
1395  * OPEN_EXPIRED:
1396  *      reclaim state on the server after a network partition.
1397  *      Assumes caller holds the appropriate lock
1398  */
1399 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1400 {
1401         struct nfs4_opendata *opendata;
1402         int ret;
1403
1404         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1405         if (IS_ERR(opendata))
1406                 return PTR_ERR(opendata);
1407         ret = nfs4_open_recover(opendata, state);
1408         if (ret == -ESTALE)
1409                 d_drop(ctx->path.dentry);
1410         nfs4_opendata_put(opendata);
1411         return ret;
1412 }
1413
1414 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1415 {
1416         struct nfs_server *server = NFS_SERVER(state->inode);
1417         struct nfs4_exception exception = { };
1418         int err;
1419
1420         do {
1421                 err = _nfs4_open_expired(ctx, state);
1422                 if (err != -NFS4ERR_DELAY)
1423                         break;
1424                 nfs4_handle_exception(server, err, &exception);
1425         } while (exception.retry);
1426         return err;
1427 }
1428
1429 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1430 {
1431         struct nfs_open_context *ctx;
1432         int ret;
1433
1434         ctx = nfs4_state_find_open_context(state);
1435         if (IS_ERR(ctx))
1436                 return PTR_ERR(ctx);
1437         ret = nfs4_do_open_expired(ctx, state);
1438         put_nfs_open_context(ctx);
1439         return ret;
1440 }
1441
1442 /*
1443  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1444  * fields corresponding to attributes that were used to store the verifier.
1445  * Make sure we clobber those fields in the later setattr call
1446  */
1447 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1448 {
1449         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1450             !(sattr->ia_valid & ATTR_ATIME_SET))
1451                 sattr->ia_valid |= ATTR_ATIME;
1452
1453         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1454             !(sattr->ia_valid & ATTR_MTIME_SET))
1455                 sattr->ia_valid |= ATTR_MTIME;
1456 }
1457
1458 /*
1459  * Returns a referenced nfs4_state
1460  */
1461 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)
1462 {
1463         struct nfs4_state_owner  *sp;
1464         struct nfs4_state     *state = NULL;
1465         struct nfs_server       *server = NFS_SERVER(dir);
1466         struct nfs4_opendata *opendata;
1467         int status;
1468
1469         /* Protect against reboot recovery conflicts */
1470         status = -ENOMEM;
1471         if (!(sp = nfs4_get_state_owner(server, cred))) {
1472                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1473                 goto out_err;
1474         }
1475         status = nfs4_recover_expired_lease(server);
1476         if (status != 0)
1477                 goto err_put_state_owner;
1478         if (path->dentry->d_inode != NULL)
1479                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1480         status = -ENOMEM;
1481         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1482         if (opendata == NULL)
1483                 goto err_put_state_owner;
1484
1485         if (path->dentry->d_inode != NULL)
1486                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1487
1488         status = _nfs4_proc_open(opendata);
1489         if (status != 0)
1490                 goto err_opendata_put;
1491
1492         if (opendata->o_arg.open_flags & O_EXCL)
1493                 nfs4_exclusive_attrset(opendata, sattr);
1494
1495         state = nfs4_opendata_to_nfs4_state(opendata);
1496         status = PTR_ERR(state);
1497         if (IS_ERR(state))
1498                 goto err_opendata_put;
1499         nfs4_opendata_put(opendata);
1500         nfs4_put_state_owner(sp);
1501         *res = state;
1502         return 0;
1503 err_opendata_put:
1504         nfs4_opendata_put(opendata);
1505 err_put_state_owner:
1506         nfs4_put_state_owner(sp);
1507 out_err:
1508         *res = NULL;
1509         return status;
1510 }
1511
1512
1513 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)
1514 {
1515         struct nfs4_exception exception = { };
1516         struct nfs4_state *res;
1517         int status;
1518
1519         do {
1520                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1521                 if (status == 0)
1522                         break;
1523                 /* NOTE: BAD_SEQID means the server and client disagree about the
1524                  * book-keeping w.r.t. state-changing operations
1525                  * (OPEN/CLOSE/LOCK/LOCKU...)
1526                  * It is actually a sign of a bug on the client or on the server.
1527                  *
1528                  * If we receive a BAD_SEQID error in the particular case of
1529                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1530                  * have unhashed the old state_owner for us, and that we can
1531                  * therefore safely retry using a new one. We should still warn
1532                  * the user though...
1533                  */
1534                 if (status == -NFS4ERR_BAD_SEQID) {
1535                         printk(KERN_WARNING "NFS: v4 server %s "
1536                                         " returned a bad sequence-id error!\n",
1537                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1538                         exception.retry = 1;
1539                         continue;
1540                 }
1541                 /*
1542                  * BAD_STATEID on OPEN means that the server cancelled our
1543                  * state before it received the OPEN_CONFIRM.
1544                  * Recover by retrying the request as per the discussion
1545                  * on Page 181 of RFC3530.
1546                  */
1547                 if (status == -NFS4ERR_BAD_STATEID) {
1548                         exception.retry = 1;
1549                         continue;
1550                 }
1551                 if (status == -EAGAIN) {
1552                         /* We must have found a delegation */
1553                         exception.retry = 1;
1554                         continue;
1555                 }
1556                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1557                                         status, &exception));
1558         } while (exception.retry);
1559         return res;
1560 }
1561
1562 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1563                             struct nfs_fattr *fattr, struct iattr *sattr,
1564                             struct nfs4_state *state)
1565 {
1566         struct nfs_server *server = NFS_SERVER(inode);
1567         struct nfs_setattrargs  arg = {
1568                 .fh             = NFS_FH(inode),
1569                 .iap            = sattr,
1570                 .server         = server,
1571                 .bitmask = server->attr_bitmask,
1572         };
1573         struct nfs_setattrres  res = {
1574                 .fattr          = fattr,
1575                 .server         = server,
1576         };
1577         struct rpc_message msg = {
1578                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1579                 .rpc_argp       = &arg,
1580                 .rpc_resp       = &res,
1581                 .rpc_cred       = cred,
1582         };
1583         unsigned long timestamp = jiffies;
1584         int status;
1585
1586         nfs_fattr_init(fattr);
1587
1588         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1589                 /* Use that stateid */
1590         } else if (state != NULL) {
1591                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1592         } else
1593                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1594
1595         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1596         if (status == 0 && state != NULL)
1597                 renew_lease(server, timestamp);
1598         return status;
1599 }
1600
1601 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1602                            struct nfs_fattr *fattr, struct iattr *sattr,
1603                            struct nfs4_state *state)
1604 {
1605         struct nfs_server *server = NFS_SERVER(inode);
1606         struct nfs4_exception exception = { };
1607         int err;
1608         do {
1609                 err = nfs4_handle_exception(server,
1610                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1611                                 &exception);
1612         } while (exception.retry);
1613         return err;
1614 }
1615
1616 struct nfs4_closedata {
1617         struct path path;
1618         struct inode *inode;
1619         struct nfs4_state *state;
1620         struct nfs_closeargs arg;
1621         struct nfs_closeres res;
1622         struct nfs_fattr fattr;
1623         unsigned long timestamp;
1624 };
1625
1626 static void nfs4_free_closedata(void *data)
1627 {
1628         struct nfs4_closedata *calldata = data;
1629         struct nfs4_state_owner *sp = calldata->state->owner;
1630
1631         nfs4_put_open_state(calldata->state);
1632         nfs_free_seqid(calldata->arg.seqid);
1633         nfs4_put_state_owner(sp);
1634         path_put(&calldata->path);
1635         kfree(calldata);
1636 }
1637
1638 static void nfs4_close_done(struct rpc_task *task, void *data)
1639 {
1640         struct nfs4_closedata *calldata = data;
1641         struct nfs4_state *state = calldata->state;
1642         struct nfs_server *server = NFS_SERVER(calldata->inode);
1643
1644         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1645         if (RPC_ASSASSINATED(task))
1646                 return;
1647         /* hmm. we are done with the inode, and in the process of freeing
1648          * the state_owner. we keep this around to process errors
1649          */
1650         switch (task->tk_status) {
1651                 case 0:
1652                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1653                         renew_lease(server, calldata->timestamp);
1654                         break;
1655                 case -NFS4ERR_STALE_STATEID:
1656                 case -NFS4ERR_OLD_STATEID:
1657                 case -NFS4ERR_BAD_STATEID:
1658                 case -NFS4ERR_EXPIRED:
1659                         if (calldata->arg.fmode == 0)
1660                                 break;
1661                 default:
1662                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1663                                 rpc_restart_call(task);
1664                                 return;
1665                         }
1666         }
1667         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1668         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1669 }
1670
1671 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1672 {
1673         struct nfs4_closedata *calldata = data;
1674         struct nfs4_state *state = calldata->state;
1675         int clear_rd, clear_wr, clear_rdwr;
1676
1677         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1678                 return;
1679
1680         clear_rd = clear_wr = clear_rdwr = 0;
1681         spin_lock(&state->owner->so_lock);
1682         /* Calculate the change in open mode */
1683         if (state->n_rdwr == 0) {
1684                 if (state->n_rdonly == 0) {
1685                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1686                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1687                 }
1688                 if (state->n_wronly == 0) {
1689                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1690                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1691                 }
1692         }
1693         spin_unlock(&state->owner->so_lock);
1694         if (!clear_rd && !clear_wr && !clear_rdwr) {
1695                 /* Note: exit _without_ calling nfs4_close_done */
1696                 task->tk_action = NULL;
1697                 return;
1698         }
1699         nfs_fattr_init(calldata->res.fattr);
1700         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1701                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1702                 calldata->arg.fmode = FMODE_READ;
1703         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1704                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1705                 calldata->arg.fmode = FMODE_WRITE;
1706         }
1707         calldata->timestamp = jiffies;
1708         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1709                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1710                                 1, task))
1711                 return;
1712         rpc_call_start(task);
1713 }
1714
1715 static const struct rpc_call_ops nfs4_close_ops = {
1716         .rpc_call_prepare = nfs4_close_prepare,
1717         .rpc_call_done = nfs4_close_done,
1718         .rpc_release = nfs4_free_closedata,
1719 };
1720
1721 /*
1722  * It is possible for data to be read/written from a mem-mapped file
1723  * after the sys_close call (which hits the vfs layer as a flush).
1724  * This means that we can't safely call nfsv4 close on a file until
1725  * the inode is cleared. This in turn means that we are not good
1726  * NFSv4 citizens - we do not indicate to the server to update the file's
1727  * share state even when we are done with one of the three share
1728  * stateid's in the inode.
1729  *
1730  * NOTE: Caller must be holding the sp->so_owner semaphore!
1731  */
1732 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1733 {
1734         struct nfs_server *server = NFS_SERVER(state->inode);
1735         struct nfs4_closedata *calldata;
1736         struct nfs4_state_owner *sp = state->owner;
1737         struct rpc_task *task;
1738         struct rpc_message msg = {
1739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1740                 .rpc_cred = state->owner->so_cred,
1741         };
1742         struct rpc_task_setup task_setup_data = {
1743                 .rpc_client = server->client,
1744                 .rpc_message = &msg,
1745                 .callback_ops = &nfs4_close_ops,
1746                 .workqueue = nfsiod_workqueue,
1747                 .flags = RPC_TASK_ASYNC,
1748         };
1749         int status = -ENOMEM;
1750
1751         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1752         if (calldata == NULL)
1753                 goto out;
1754         calldata->inode = state->inode;
1755         calldata->state = state;
1756         calldata->arg.fh = NFS_FH(state->inode);
1757         calldata->arg.stateid = &state->open_stateid;
1758         /* Serialization for the sequence id */
1759         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1760         if (calldata->arg.seqid == NULL)
1761                 goto out_free_calldata;
1762         calldata->arg.fmode = 0;
1763         calldata->arg.bitmask = server->cache_consistency_bitmask;
1764         calldata->res.fattr = &calldata->fattr;
1765         calldata->res.seqid = calldata->arg.seqid;
1766         calldata->res.server = server;
1767         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1768         calldata->path.mnt = mntget(path->mnt);
1769         calldata->path.dentry = dget(path->dentry);
1770
1771         msg.rpc_argp = &calldata->arg,
1772         msg.rpc_resp = &calldata->res,
1773         task_setup_data.callback_data = calldata;
1774         task = rpc_run_task(&task_setup_data);
1775         if (IS_ERR(task))
1776                 return PTR_ERR(task);
1777         status = 0;
1778         if (wait)
1779                 status = rpc_wait_for_completion_task(task);
1780         rpc_put_task(task);
1781         return status;
1782 out_free_calldata:
1783         kfree(calldata);
1784 out:
1785         nfs4_put_open_state(state);
1786         nfs4_put_state_owner(sp);
1787         return status;
1788 }
1789
1790 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1791 {
1792         struct file *filp;
1793         int ret;
1794
1795         /* If the open_intent is for execute, we have an extra check to make */
1796         if (fmode & FMODE_EXEC) {
1797                 ret = nfs_may_open(state->inode,
1798                                 state->owner->so_cred,
1799                                 nd->intent.open.flags);
1800                 if (ret < 0)
1801                         goto out_close;
1802         }
1803         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1804         if (!IS_ERR(filp)) {
1805                 struct nfs_open_context *ctx;
1806                 ctx = nfs_file_open_context(filp);
1807                 ctx->state = state;
1808                 return 0;
1809         }
1810         ret = PTR_ERR(filp);
1811 out_close:
1812         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1813         return ret;
1814 }
1815
1816 struct dentry *
1817 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1818 {
1819         struct path path = {
1820                 .mnt = nd->path.mnt,
1821                 .dentry = dentry,
1822         };
1823         struct dentry *parent;
1824         struct iattr attr;
1825         struct rpc_cred *cred;
1826         struct nfs4_state *state;
1827         struct dentry *res;
1828         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1829
1830         if (nd->flags & LOOKUP_CREATE) {
1831                 attr.ia_mode = nd->intent.open.create_mode;
1832                 attr.ia_valid = ATTR_MODE;
1833                 if (!IS_POSIXACL(dir))
1834                         attr.ia_mode &= ~current_umask();
1835         } else {
1836                 attr.ia_valid = 0;
1837                 BUG_ON(nd->intent.open.flags & O_CREAT);
1838         }
1839
1840         cred = rpc_lookup_cred();
1841         if (IS_ERR(cred))
1842                 return (struct dentry *)cred;
1843         parent = dentry->d_parent;
1844         /* Protect against concurrent sillydeletes */
1845         nfs_block_sillyrename(parent);
1846         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1847         put_rpccred(cred);
1848         if (IS_ERR(state)) {
1849                 if (PTR_ERR(state) == -ENOENT) {
1850                         d_add(dentry, NULL);
1851                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1852                 }
1853                 nfs_unblock_sillyrename(parent);
1854                 return (struct dentry *)state;
1855         }
1856         res = d_add_unique(dentry, igrab(state->inode));
1857         if (res != NULL)
1858                 path.dentry = res;
1859         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1860         nfs_unblock_sillyrename(parent);
1861         nfs4_intent_set_file(nd, &path, state, fmode);
1862         return res;
1863 }
1864
1865 int
1866 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1867 {
1868         struct path path = {
1869                 .mnt = nd->path.mnt,
1870                 .dentry = dentry,
1871         };
1872         struct rpc_cred *cred;
1873         struct nfs4_state *state;
1874         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1875
1876         cred = rpc_lookup_cred();
1877         if (IS_ERR(cred))
1878                 return PTR_ERR(cred);
1879         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1880         put_rpccred(cred);
1881         if (IS_ERR(state)) {
1882                 switch (PTR_ERR(state)) {
1883                         case -EPERM:
1884                         case -EACCES:
1885                         case -EDQUOT:
1886                         case -ENOSPC:
1887                         case -EROFS:
1888                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1889                                 return 1;
1890                         default:
1891                                 goto out_drop;
1892                 }
1893         }
1894         if (state->inode == dentry->d_inode) {
1895                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1896                 nfs4_intent_set_file(nd, &path, state, fmode);
1897                 return 1;
1898         }
1899         nfs4_close_sync(&path, state, fmode);
1900 out_drop:
1901         d_drop(dentry);
1902         return 0;
1903 }
1904
1905 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1906 {
1907         if (ctx->state == NULL)
1908                 return;
1909         if (is_sync)
1910                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1911         else
1912                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1913 }
1914
1915 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1916 {
1917         struct nfs4_server_caps_arg args = {
1918                 .fhandle = fhandle,
1919         };
1920         struct nfs4_server_caps_res res = {};
1921         struct rpc_message msg = {
1922                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1923                 .rpc_argp = &args,
1924                 .rpc_resp = &res,
1925         };
1926         int status;
1927
1928         status = nfs4_call_sync(server, &msg, &args, &res, 0);
1929         if (status == 0) {
1930                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1931                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1932                         server->caps |= NFS_CAP_ACLS;
1933                 if (res.has_links != 0)
1934                         server->caps |= NFS_CAP_HARDLINKS;
1935                 if (res.has_symlinks != 0)
1936                         server->caps |= NFS_CAP_SYMLINKS;
1937                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
1938                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
1939                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1940                 server->acl_bitmask = res.acl_bitmask;
1941         }
1942
1943         return status;
1944 }
1945
1946 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1947 {
1948         struct nfs4_exception exception = { };
1949         int err;
1950         do {
1951                 err = nfs4_handle_exception(server,
1952                                 _nfs4_server_capabilities(server, fhandle),
1953                                 &exception);
1954         } while (exception.retry);
1955         return err;
1956 }
1957
1958 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1959                 struct nfs_fsinfo *info)
1960 {
1961         struct nfs4_lookup_root_arg args = {
1962                 .bitmask = nfs4_fattr_bitmap,
1963         };
1964         struct nfs4_lookup_res res = {
1965                 .server = server,
1966                 .fattr = info->fattr,
1967                 .fh = fhandle,
1968         };
1969         struct rpc_message msg = {
1970                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1971                 .rpc_argp = &args,
1972                 .rpc_resp = &res,
1973         };
1974         nfs_fattr_init(info->fattr);
1975         return nfs4_call_sync(server, &msg, &args, &res, 0);
1976 }
1977
1978 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1979                 struct nfs_fsinfo *info)
1980 {
1981         struct nfs4_exception exception = { };
1982         int err;
1983         do {
1984                 err = nfs4_handle_exception(server,
1985                                 _nfs4_lookup_root(server, fhandle, info),
1986                                 &exception);
1987         } while (exception.retry);
1988         return err;
1989 }
1990
1991 /*
1992  * get the file handle for the "/" directory on the server
1993  */
1994 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1995                               struct nfs_fsinfo *info)
1996 {
1997         int status;
1998
1999         status = nfs4_lookup_root(server, fhandle, info);
2000         if (status == 0)
2001                 status = nfs4_server_capabilities(server, fhandle);
2002         if (status == 0)
2003                 status = nfs4_do_fsinfo(server, fhandle, info);
2004         return nfs4_map_errors(status);
2005 }
2006
2007 /*
2008  * Get locations and (maybe) other attributes of a referral.
2009  * Note that we'll actually follow the referral later when
2010  * we detect fsid mismatch in inode revalidation
2011  */
2012 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2013 {
2014         int status = -ENOMEM;
2015         struct page *page = NULL;
2016         struct nfs4_fs_locations *locations = NULL;
2017
2018         page = alloc_page(GFP_KERNEL);
2019         if (page == NULL)
2020                 goto out;
2021         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2022         if (locations == NULL)
2023                 goto out;
2024
2025         status = nfs4_proc_fs_locations(dir, name, locations, page);
2026         if (status != 0)
2027                 goto out;
2028         /* Make sure server returned a different fsid for the referral */
2029         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2030                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2031                 status = -EIO;
2032                 goto out;
2033         }
2034
2035         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2036         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2037         if (!fattr->mode)
2038                 fattr->mode = S_IFDIR;
2039         memset(fhandle, 0, sizeof(struct nfs_fh));
2040 out:
2041         if (page)
2042                 __free_page(page);
2043         if (locations)
2044                 kfree(locations);
2045         return status;
2046 }
2047
2048 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2049 {
2050         struct nfs4_getattr_arg args = {
2051                 .fh = fhandle,
2052                 .bitmask = server->attr_bitmask,
2053         };
2054         struct nfs4_getattr_res res = {
2055                 .fattr = fattr,
2056                 .server = server,
2057         };
2058         struct rpc_message msg = {
2059                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2060                 .rpc_argp = &args,
2061                 .rpc_resp = &res,
2062         };
2063
2064         nfs_fattr_init(fattr);
2065         return nfs4_call_sync(server, &msg, &args, &res, 0);
2066 }
2067
2068 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2069 {
2070         struct nfs4_exception exception = { };
2071         int err;
2072         do {
2073                 err = nfs4_handle_exception(server,
2074                                 _nfs4_proc_getattr(server, fhandle, fattr),
2075                                 &exception);
2076         } while (exception.retry);
2077         return err;
2078 }
2079
2080 /*
2081  * The file is not closed if it is opened due to the a request to change
2082  * the size of the file. The open call will not be needed once the
2083  * VFS layer lookup-intents are implemented.
2084  *
2085  * Close is called when the inode is destroyed.
2086  * If we haven't opened the file for O_WRONLY, we
2087  * need to in the size_change case to obtain a stateid.
2088  *
2089  * Got race?
2090  * Because OPEN is always done by name in nfsv4, it is
2091  * possible that we opened a different file by the same
2092  * name.  We can recognize this race condition, but we
2093  * can't do anything about it besides returning an error.
2094  *
2095  * This will be fixed with VFS changes (lookup-intent).
2096  */
2097 static int
2098 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2099                   struct iattr *sattr)
2100 {
2101         struct inode *inode = dentry->d_inode;
2102         struct rpc_cred *cred = NULL;
2103         struct nfs4_state *state = NULL;
2104         int status;
2105
2106         nfs_fattr_init(fattr);
2107
2108         /* Search for an existing open(O_WRITE) file */
2109         if (sattr->ia_valid & ATTR_FILE) {
2110                 struct nfs_open_context *ctx;
2111
2112                 ctx = nfs_file_open_context(sattr->ia_file);
2113                 if (ctx) {
2114                         cred = ctx->cred;
2115                         state = ctx->state;
2116                 }
2117         }
2118
2119         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2120         if (status == 0)
2121                 nfs_setattr_update_inode(inode, sattr);
2122         return status;
2123 }
2124
2125 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2126                 const struct qstr *name, struct nfs_fh *fhandle,
2127                 struct nfs_fattr *fattr)
2128 {
2129         int                    status;
2130         struct nfs4_lookup_arg args = {
2131                 .bitmask = server->attr_bitmask,
2132                 .dir_fh = dirfh,
2133                 .name = name,
2134         };
2135         struct nfs4_lookup_res res = {
2136                 .server = server,
2137                 .fattr = fattr,
2138                 .fh = fhandle,
2139         };
2140         struct rpc_message msg = {
2141                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2142                 .rpc_argp = &args,
2143                 .rpc_resp = &res,
2144         };
2145
2146         nfs_fattr_init(fattr);
2147
2148         dprintk("NFS call  lookupfh %s\n", name->name);
2149         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2150         dprintk("NFS reply lookupfh: %d\n", status);
2151         return status;
2152 }
2153
2154 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2155                               struct qstr *name, struct nfs_fh *fhandle,
2156                               struct nfs_fattr *fattr)
2157 {
2158         struct nfs4_exception exception = { };
2159         int err;
2160         do {
2161                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2162                 /* FIXME: !!!! */
2163                 if (err == -NFS4ERR_MOVED) {
2164                         err = -EREMOTE;
2165                         break;
2166                 }
2167                 err = nfs4_handle_exception(server, err, &exception);
2168         } while (exception.retry);
2169         return err;
2170 }
2171
2172 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2173                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2174 {
2175         int status;
2176
2177         dprintk("NFS call  lookup %s\n", name->name);
2178         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2179         if (status == -NFS4ERR_MOVED)
2180                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2181         dprintk("NFS reply lookup: %d\n", status);
2182         return status;
2183 }
2184
2185 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2186 {
2187         struct nfs4_exception exception = { };
2188         int err;
2189         do {
2190                 err = nfs4_handle_exception(NFS_SERVER(dir),
2191                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2192                                 &exception);
2193         } while (exception.retry);
2194         return err;
2195 }
2196
2197 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2198 {
2199         struct nfs_server *server = NFS_SERVER(inode);
2200         struct nfs_fattr fattr;
2201         struct nfs4_accessargs args = {
2202                 .fh = NFS_FH(inode),
2203                 .bitmask = server->attr_bitmask,
2204         };
2205         struct nfs4_accessres res = {
2206                 .server = server,
2207                 .fattr = &fattr,
2208         };
2209         struct rpc_message msg = {
2210                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2211                 .rpc_argp = &args,
2212                 .rpc_resp = &res,
2213                 .rpc_cred = entry->cred,
2214         };
2215         int mode = entry->mask;
2216         int status;
2217
2218         /*
2219          * Determine which access bits we want to ask for...
2220          */
2221         if (mode & MAY_READ)
2222                 args.access |= NFS4_ACCESS_READ;
2223         if (S_ISDIR(inode->i_mode)) {
2224                 if (mode & MAY_WRITE)
2225                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2226                 if (mode & MAY_EXEC)
2227                         args.access |= NFS4_ACCESS_LOOKUP;
2228         } else {
2229                 if (mode & MAY_WRITE)
2230                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2231                 if (mode & MAY_EXEC)
2232                         args.access |= NFS4_ACCESS_EXECUTE;
2233         }
2234         nfs_fattr_init(&fattr);
2235         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2236         if (!status) {
2237                 entry->mask = 0;
2238                 if (res.access & NFS4_ACCESS_READ)
2239                         entry->mask |= MAY_READ;
2240                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2241                         entry->mask |= MAY_WRITE;
2242                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2243                         entry->mask |= MAY_EXEC;
2244                 nfs_refresh_inode(inode, &fattr);
2245         }
2246         return status;
2247 }
2248
2249 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2250 {
2251         struct nfs4_exception exception = { };
2252         int err;
2253         do {
2254                 err = nfs4_handle_exception(NFS_SERVER(inode),
2255                                 _nfs4_proc_access(inode, entry),
2256                                 &exception);
2257         } while (exception.retry);
2258         return err;
2259 }
2260
2261 /*
2262  * TODO: For the time being, we don't try to get any attributes
2263  * along with any of the zero-copy operations READ, READDIR,
2264  * READLINK, WRITE.
2265  *
2266  * In the case of the first three, we want to put the GETATTR
2267  * after the read-type operation -- this is because it is hard
2268  * to predict the length of a GETATTR response in v4, and thus
2269  * align the READ data correctly.  This means that the GETATTR
2270  * may end up partially falling into the page cache, and we should
2271  * shift it into the 'tail' of the xdr_buf before processing.
2272  * To do this efficiently, we need to know the total length
2273  * of data received, which doesn't seem to be available outside
2274  * of the RPC layer.
2275  *
2276  * In the case of WRITE, we also want to put the GETATTR after
2277  * the operation -- in this case because we want to make sure
2278  * we get the post-operation mtime and size.  This means that
2279  * we can't use xdr_encode_pages() as written: we need a variant
2280  * of it which would leave room in the 'tail' iovec.
2281  *
2282  * Both of these changes to the XDR layer would in fact be quite
2283  * minor, but I decided to leave them for a subsequent patch.
2284  */
2285 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2286                 unsigned int pgbase, unsigned int pglen)
2287 {
2288         struct nfs4_readlink args = {
2289                 .fh       = NFS_FH(inode),
2290                 .pgbase   = pgbase,
2291                 .pglen    = pglen,
2292                 .pages    = &page,
2293         };
2294         struct nfs4_readlink_res res;
2295         struct rpc_message msg = {
2296                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2297                 .rpc_argp = &args,
2298                 .rpc_resp = &res,
2299         };
2300
2301         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2302 }
2303
2304 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2305                 unsigned int pgbase, unsigned int pglen)
2306 {
2307         struct nfs4_exception exception = { };
2308         int err;
2309         do {
2310                 err = nfs4_handle_exception(NFS_SERVER(inode),
2311                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2312                                 &exception);
2313         } while (exception.retry);
2314         return err;
2315 }
2316
2317 /*
2318  * Got race?
2319  * We will need to arrange for the VFS layer to provide an atomic open.
2320  * Until then, this create/open method is prone to inefficiency and race
2321  * conditions due to the lookup, create, and open VFS calls from sys_open()
2322  * placed on the wire.
2323  *
2324  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2325  * The file will be opened again in the subsequent VFS open call
2326  * (nfs4_proc_file_open).
2327  *
2328  * The open for read will just hang around to be used by any process that
2329  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2330  */
2331
2332 static int
2333 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2334                  int flags, struct nameidata *nd)
2335 {
2336         struct path path = {
2337                 .mnt = nd->path.mnt,
2338                 .dentry = dentry,
2339         };
2340         struct nfs4_state *state;
2341         struct rpc_cred *cred;
2342         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2343         int status = 0;
2344
2345         cred = rpc_lookup_cred();
2346         if (IS_ERR(cred)) {
2347                 status = PTR_ERR(cred);
2348                 goto out;
2349         }
2350         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2351         d_drop(dentry);
2352         if (IS_ERR(state)) {
2353                 status = PTR_ERR(state);
2354                 goto out_putcred;
2355         }
2356         d_add(dentry, igrab(state->inode));
2357         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2358         if (flags & O_EXCL) {
2359                 struct nfs_fattr fattr;
2360                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2361                 if (status == 0)
2362                         nfs_setattr_update_inode(state->inode, sattr);
2363                 nfs_post_op_update_inode(state->inode, &fattr);
2364         }
2365         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2366                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2367         else
2368                 nfs4_close_sync(&path, state, fmode);
2369 out_putcred:
2370         put_rpccred(cred);
2371 out:
2372         return status;
2373 }
2374
2375 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2376 {
2377         struct nfs_server *server = NFS_SERVER(dir);
2378         struct nfs_removeargs args = {
2379                 .fh = NFS_FH(dir),
2380                 .name.len = name->len,
2381                 .name.name = name->name,
2382                 .bitmask = server->attr_bitmask,
2383         };
2384         struct nfs_removeres res = {
2385                 .server = server,
2386         };
2387         struct rpc_message msg = {
2388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2389                 .rpc_argp = &args,
2390                 .rpc_resp = &res,
2391         };
2392         int                     status;
2393
2394         nfs_fattr_init(&res.dir_attr);
2395         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2396         if (status == 0) {
2397                 update_changeattr(dir, &res.cinfo);
2398                 nfs_post_op_update_inode(dir, &res.dir_attr);
2399         }
2400         return status;
2401 }
2402
2403 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2404 {
2405         struct nfs4_exception exception = { };
2406         int err;
2407         do {
2408                 err = nfs4_handle_exception(NFS_SERVER(dir),
2409                                 _nfs4_proc_remove(dir, name),
2410                                 &exception);
2411         } while (exception.retry);
2412         return err;
2413 }
2414
2415 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2416 {
2417         struct nfs_server *server = NFS_SERVER(dir);
2418         struct nfs_removeargs *args = msg->rpc_argp;
2419         struct nfs_removeres *res = msg->rpc_resp;
2420
2421         args->bitmask = server->cache_consistency_bitmask;
2422         res->server = server;
2423         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2424 }
2425
2426 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2427 {
2428         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2429
2430         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2431         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2432                 return 0;
2433         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2434         update_changeattr(dir, &res->cinfo);
2435         nfs_post_op_update_inode(dir, &res->dir_attr);
2436         return 1;
2437 }
2438
2439 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2440                 struct inode *new_dir, struct qstr *new_name)
2441 {
2442         struct nfs_server *server = NFS_SERVER(old_dir);
2443         struct nfs4_rename_arg arg = {
2444                 .old_dir = NFS_FH(old_dir),
2445                 .new_dir = NFS_FH(new_dir),
2446                 .old_name = old_name,
2447                 .new_name = new_name,
2448                 .bitmask = server->attr_bitmask,
2449         };
2450         struct nfs_fattr old_fattr, new_fattr;
2451         struct nfs4_rename_res res = {
2452                 .server = server,
2453                 .old_fattr = &old_fattr,
2454                 .new_fattr = &new_fattr,
2455         };
2456         struct rpc_message msg = {
2457                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2458                 .rpc_argp = &arg,
2459                 .rpc_resp = &res,
2460         };
2461         int                     status;
2462
2463         nfs_fattr_init(res.old_fattr);
2464         nfs_fattr_init(res.new_fattr);
2465         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2466
2467         if (!status) {
2468                 update_changeattr(old_dir, &res.old_cinfo);
2469                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2470                 update_changeattr(new_dir, &res.new_cinfo);
2471                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2472         }
2473         return status;
2474 }
2475
2476 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2477                 struct inode *new_dir, struct qstr *new_name)
2478 {
2479         struct nfs4_exception exception = { };
2480         int err;
2481         do {
2482                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2483                                 _nfs4_proc_rename(old_dir, old_name,
2484                                         new_dir, new_name),
2485                                 &exception);
2486         } while (exception.retry);
2487         return err;
2488 }
2489
2490 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2491 {
2492         struct nfs_server *server = NFS_SERVER(inode);
2493         struct nfs4_link_arg arg = {
2494                 .fh     = NFS_FH(inode),
2495                 .dir_fh = NFS_FH(dir),
2496                 .name   = name,
2497                 .bitmask = server->attr_bitmask,
2498         };
2499         struct nfs_fattr fattr, dir_attr;
2500         struct nfs4_link_res res = {
2501                 .server = server,
2502                 .fattr = &fattr,
2503                 .dir_attr = &dir_attr,
2504         };
2505         struct rpc_message msg = {
2506                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2507                 .rpc_argp = &arg,
2508                 .rpc_resp = &res,
2509         };
2510         int                     status;
2511
2512         nfs_fattr_init(res.fattr);
2513         nfs_fattr_init(res.dir_attr);
2514         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2515         if (!status) {
2516                 update_changeattr(dir, &res.cinfo);
2517                 nfs_post_op_update_inode(dir, res.dir_attr);
2518                 nfs_post_op_update_inode(inode, res.fattr);
2519         }
2520
2521         return status;
2522 }
2523
2524 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2525 {
2526         struct nfs4_exception exception = { };
2527         int err;
2528         do {
2529                 err = nfs4_handle_exception(NFS_SERVER(inode),
2530                                 _nfs4_proc_link(inode, dir, name),
2531                                 &exception);
2532         } while (exception.retry);
2533         return err;
2534 }
2535
2536 struct nfs4_createdata {
2537         struct rpc_message msg;
2538         struct nfs4_create_arg arg;
2539         struct nfs4_create_res res;
2540         struct nfs_fh fh;
2541         struct nfs_fattr fattr;
2542         struct nfs_fattr dir_fattr;
2543 };
2544
2545 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2546                 struct qstr *name, struct iattr *sattr, u32 ftype)
2547 {
2548         struct nfs4_createdata *data;
2549
2550         data = kzalloc(sizeof(*data), GFP_KERNEL);
2551         if (data != NULL) {
2552                 struct nfs_server *server = NFS_SERVER(dir);
2553
2554                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2555                 data->msg.rpc_argp = &data->arg;
2556                 data->msg.rpc_resp = &data->res;
2557                 data->arg.dir_fh = NFS_FH(dir);
2558                 data->arg.server = server;
2559                 data->arg.name = name;
2560                 data->arg.attrs = sattr;
2561                 data->arg.ftype = ftype;
2562                 data->arg.bitmask = server->attr_bitmask;
2563                 data->res.server = server;
2564                 data->res.fh = &data->fh;
2565                 data->res.fattr = &data->fattr;
2566                 data->res.dir_fattr = &data->dir_fattr;
2567                 nfs_fattr_init(data->res.fattr);
2568                 nfs_fattr_init(data->res.dir_fattr);
2569         }
2570         return data;
2571 }
2572
2573 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2574 {
2575         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2576                                     &data->arg, &data->res, 1);
2577         if (status == 0) {
2578                 update_changeattr(dir, &data->res.dir_cinfo);
2579                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2580                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2581         }
2582         return status;
2583 }
2584
2585 static void nfs4_free_createdata(struct nfs4_createdata *data)
2586 {
2587         kfree(data);
2588 }
2589
2590 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2591                 struct page *page, unsigned int len, struct iattr *sattr)
2592 {
2593         struct nfs4_createdata *data;
2594         int status = -ENAMETOOLONG;
2595
2596         if (len > NFS4_MAXPATHLEN)
2597                 goto out;
2598
2599         status = -ENOMEM;
2600         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2601         if (data == NULL)
2602                 goto out;
2603
2604         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2605         data->arg.u.symlink.pages = &page;
2606         data->arg.u.symlink.len = len;
2607
2608         status = nfs4_do_create(dir, dentry, data);
2609
2610         nfs4_free_createdata(data);
2611 out:
2612         return status;
2613 }
2614
2615 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2616                 struct page *page, unsigned int len, struct iattr *sattr)
2617 {
2618         struct nfs4_exception exception = { };
2619         int err;
2620         do {
2621                 err = nfs4_handle_exception(NFS_SERVER(dir),
2622                                 _nfs4_proc_symlink(dir, dentry, page,
2623                                                         len, sattr),
2624                                 &exception);
2625         } while (exception.retry);
2626         return err;
2627 }
2628
2629 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2630                 struct iattr *sattr)
2631 {
2632         struct nfs4_createdata *data;
2633         int status = -ENOMEM;
2634
2635         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2636         if (data == NULL)
2637                 goto out;
2638
2639         status = nfs4_do_create(dir, dentry, data);
2640
2641         nfs4_free_createdata(data);
2642 out:
2643         return status;
2644 }
2645
2646 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2647                 struct iattr *sattr)
2648 {
2649         struct nfs4_exception exception = { };
2650         int err;
2651         do {
2652                 err = nfs4_handle_exception(NFS_SERVER(dir),
2653                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2654                                 &exception);
2655         } while (exception.retry);
2656         return err;
2657 }
2658
2659 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2660                   u64 cookie, struct page *page, unsigned int count, int plus)
2661 {
2662         struct inode            *dir = dentry->d_inode;
2663         struct nfs4_readdir_arg args = {
2664                 .fh = NFS_FH(dir),
2665                 .pages = &page,
2666                 .pgbase = 0,
2667                 .count = count,
2668                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2669         };
2670         struct nfs4_readdir_res res;
2671         struct rpc_message msg = {
2672                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2673                 .rpc_argp = &args,
2674                 .rpc_resp = &res,
2675                 .rpc_cred = cred,
2676         };
2677         int                     status;
2678
2679         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2680                         dentry->d_parent->d_name.name,
2681                         dentry->d_name.name,
2682                         (unsigned long long)cookie);
2683         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2684         res.pgbase = args.pgbase;
2685         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2686         if (status == 0)
2687                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2688
2689         nfs_invalidate_atime(dir);
2690
2691         dprintk("%s: returns %d\n", __func__, status);
2692         return status;
2693 }
2694
2695 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2696                   u64 cookie, struct page *page, unsigned int count, int plus)
2697 {
2698         struct nfs4_exception exception = { };
2699         int err;
2700         do {
2701                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2702                                 _nfs4_proc_readdir(dentry, cred, cookie,
2703                                         page, count, plus),
2704                                 &exception);
2705         } while (exception.retry);
2706         return err;
2707 }
2708
2709 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2710                 struct iattr *sattr, dev_t rdev)
2711 {
2712         struct nfs4_createdata *data;
2713         int mode = sattr->ia_mode;
2714         int status = -ENOMEM;
2715
2716         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2717         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2718
2719         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2720         if (data == NULL)
2721                 goto out;
2722
2723         if (S_ISFIFO(mode))
2724                 data->arg.ftype = NF4FIFO;
2725         else if (S_ISBLK(mode)) {
2726                 data->arg.ftype = NF4BLK;
2727                 data->arg.u.device.specdata1 = MAJOR(rdev);
2728                 data->arg.u.device.specdata2 = MINOR(rdev);
2729         }
2730         else if (S_ISCHR(mode)) {
2731                 data->arg.ftype = NF4CHR;
2732                 data->arg.u.device.specdata1 = MAJOR(rdev);
2733                 data->arg.u.device.specdata2 = MINOR(rdev);
2734         }
2735
2736         status = nfs4_do_create(dir, dentry, data);
2737
2738         nfs4_free_createdata(data);
2739 out:
2740         return status;
2741 }
2742
2743 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2744                 struct iattr *sattr, dev_t rdev)
2745 {
2746         struct nfs4_exception exception = { };
2747         int err;
2748         do {
2749                 err = nfs4_handle_exception(NFS_SERVER(dir),
2750                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2751                                 &exception);
2752         } while (exception.retry);
2753         return err;
2754 }
2755
2756 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2757                  struct nfs_fsstat *fsstat)
2758 {
2759         struct nfs4_statfs_arg args = {
2760                 .fh = fhandle,
2761                 .bitmask = server->attr_bitmask,
2762         };
2763         struct nfs4_statfs_res res = {
2764                 .fsstat = fsstat,
2765         };
2766         struct rpc_message msg = {
2767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2768                 .rpc_argp = &args,
2769                 .rpc_resp = &res,
2770         };
2771
2772         nfs_fattr_init(fsstat->fattr);
2773         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2774 }
2775
2776 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2777 {
2778         struct nfs4_exception exception = { };
2779         int err;
2780         do {
2781                 err = nfs4_handle_exception(server,
2782                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2783                                 &exception);
2784         } while (exception.retry);
2785         return err;
2786 }
2787
2788 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2789                 struct nfs_fsinfo *fsinfo)
2790 {
2791         struct nfs4_fsinfo_arg args = {
2792                 .fh = fhandle,
2793                 .bitmask = server->attr_bitmask,
2794         };
2795         struct nfs4_fsinfo_res res = {
2796                 .fsinfo = fsinfo,
2797         };
2798         struct rpc_message msg = {
2799                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2800                 .rpc_argp = &args,
2801                 .rpc_resp = &res,
2802         };
2803
2804         return nfs4_call_sync(server, &msg, &args, &res, 0);
2805 }
2806
2807 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2808 {
2809         struct nfs4_exception exception = { };
2810         int err;
2811
2812         do {
2813                 err = nfs4_handle_exception(server,
2814                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2815                                 &exception);
2816         } while (exception.retry);
2817         return err;
2818 }
2819
2820 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2821 {
2822         nfs_fattr_init(fsinfo->fattr);
2823         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2824 }
2825
2826 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2827                 struct nfs_pathconf *pathconf)
2828 {
2829         struct nfs4_pathconf_arg args = {
2830                 .fh = fhandle,
2831                 .bitmask = server->attr_bitmask,
2832         };
2833         struct nfs4_pathconf_res res = {
2834                 .pathconf = pathconf,
2835         };
2836         struct rpc_message msg = {
2837                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2838                 .rpc_argp = &args,
2839                 .rpc_resp = &res,
2840         };
2841
2842         /* None of the pathconf attributes are mandatory to implement */
2843         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2844                 memset(pathconf, 0, sizeof(*pathconf));
2845                 return 0;
2846         }
2847
2848         nfs_fattr_init(pathconf->fattr);
2849         return nfs4_call_sync(server, &msg, &args, &res, 0);
2850 }
2851
2852 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2853                 struct nfs_pathconf *pathconf)
2854 {
2855         struct nfs4_exception exception = { };
2856         int err;
2857
2858         do {
2859                 err = nfs4_handle_exception(server,
2860                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2861                                 &exception);
2862         } while (exception.retry);
2863         return err;
2864 }
2865
2866 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2867 {
2868         struct nfs_server *server = NFS_SERVER(data->inode);
2869
2870         dprintk("--> %s\n", __func__);
2871
2872         /* nfs4_sequence_free_slot called in the read rpc_call_done */
2873         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2874
2875         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2876                 rpc_restart_call(task);
2877                 return -EAGAIN;
2878         }
2879
2880         nfs_invalidate_atime(data->inode);
2881         if (task->tk_status > 0)
2882                 renew_lease(server, data->timestamp);
2883         return 0;
2884 }
2885
2886 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2887 {
2888         data->timestamp   = jiffies;
2889         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2890 }
2891
2892 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2893 {
2894         struct inode *inode = data->inode;
2895
2896         /* slot is freed in nfs_writeback_done */
2897         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2898                            task->tk_status);
2899
2900         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2901                 rpc_restart_call(task);
2902                 return -EAGAIN;
2903         }
2904         if (task->tk_status >= 0) {
2905                 renew_lease(NFS_SERVER(inode), data->timestamp);
2906                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2907         }
2908         return 0;
2909 }
2910
2911 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2912 {
2913         struct nfs_server *server = NFS_SERVER(data->inode);
2914
2915         data->args.bitmask = server->cache_consistency_bitmask;
2916         data->res.server = server;
2917         data->timestamp   = jiffies;
2918
2919         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2920 }
2921
2922 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2923 {
2924         struct inode *inode = data->inode;
2925
2926         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2927                            task->tk_status);
2928         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2929                 rpc_restart_call(task);
2930                 return -EAGAIN;
2931         }
2932         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
2933                                 &data->res.seq_res);
2934         nfs_refresh_inode(inode, data->res.fattr);
2935         return 0;
2936 }
2937
2938 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2939 {
2940         struct nfs_server *server = NFS_SERVER(data->inode);
2941
2942         data->args.bitmask = server->cache_consistency_bitmask;
2943         data->res.server = server;
2944         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2945 }
2946
2947 /*
2948  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2949  * standalone procedure for queueing an asynchronous RENEW.
2950  */
2951 static void nfs4_renew_done(struct rpc_task *task, void *data)
2952 {
2953         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2954         unsigned long timestamp = (unsigned long)data;
2955
2956         if (task->tk_status < 0) {
2957                 /* Unless we're shutting down, schedule state recovery! */
2958                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
2959                         nfs4_schedule_state_recovery(clp);
2960                 return;
2961         }
2962         spin_lock(&clp->cl_lock);
2963         if (time_before(clp->cl_last_renewal,timestamp))
2964                 clp->cl_last_renewal = timestamp;
2965         spin_unlock(&clp->cl_lock);
2966 }
2967
2968 static const struct rpc_call_ops nfs4_renew_ops = {
2969         .rpc_call_done = nfs4_renew_done,
2970 };
2971
2972 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2973 {
2974         struct rpc_message msg = {
2975                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2976                 .rpc_argp       = clp,
2977                 .rpc_cred       = cred,
2978         };
2979
2980         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2981                         &nfs4_renew_ops, (void *)jiffies);
2982 }
2983
2984 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2985 {
2986         struct rpc_message msg = {
2987                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2988                 .rpc_argp       = clp,
2989                 .rpc_cred       = cred,
2990         };
2991         unsigned long now = jiffies;
2992         int status;
2993
2994         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2995         if (status < 0)
2996                 return status;
2997         spin_lock(&clp->cl_lock);
2998         if (time_before(clp->cl_last_renewal,now))
2999                 clp->cl_last_renewal = now;
3000         spin_unlock(&clp->cl_lock);
3001         return 0;
3002 }
3003
3004 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3005 {
3006         return (server->caps & NFS_CAP_ACLS)
3007                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3008                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3009 }
3010
3011 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3012  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3013  * the stack.
3014  */
3015 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3016
3017 static void buf_to_pages(const void *buf, size_t buflen,
3018                 struct page **pages, unsigned int *pgbase)
3019 {
3020         const void *p = buf;
3021
3022         *pgbase = offset_in_page(buf);
3023         p -= *pgbase;
3024         while (p < buf + buflen) {
3025                 *(pages++) = virt_to_page(p);
3026                 p += PAGE_CACHE_SIZE;
3027         }
3028 }
3029
3030 struct nfs4_cached_acl {
3031         int cached;
3032         size_t len;
3033         char data[0];
3034 };
3035
3036 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3037 {
3038         struct nfs_inode *nfsi = NFS_I(inode);
3039
3040         spin_lock(&inode->i_lock);
3041         kfree(nfsi->nfs4_acl);
3042         nfsi->nfs4_acl = acl;
3043         spin_unlock(&inode->i_lock);
3044 }
3045
3046 static void nfs4_zap_acl_attr(struct inode *inode)
3047 {
3048         nfs4_set_cached_acl(inode, NULL);
3049 }
3050
3051 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3052 {
3053         struct nfs_inode *nfsi = NFS_I(inode);
3054         struct nfs4_cached_acl *acl;
3055         int ret = -ENOENT;
3056
3057         spin_lock(&inode->i_lock);
3058         acl = nfsi->nfs4_acl;
3059         if (acl == NULL)
3060                 goto out;
3061         if (buf == NULL) /* user is just asking for length */
3062                 goto out_len;
3063         if (acl->cached == 0)
3064                 goto out;
3065         ret = -ERANGE; /* see getxattr(2) man page */
3066         if (acl->len > buflen)
3067                 goto out;
3068         memcpy(buf, acl->data, acl->len);
3069 out_len:
3070         ret = acl->len;
3071 out:
3072         spin_unlock(&inode->i_lock);
3073         return ret;
3074 }
3075
3076 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3077 {
3078         struct nfs4_cached_acl *acl;
3079
3080         if (buf && acl_len <= PAGE_SIZE) {
3081                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3082                 if (acl == NULL)
3083                         goto out;
3084                 acl->cached = 1;
3085                 memcpy(acl->data, buf, acl_len);
3086         } else {
3087                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3088                 if (acl == NULL)
3089                         goto out;
3090                 acl->cached = 0;
3091         }
3092         acl->len = acl_len;
3093 out:
3094         nfs4_set_cached_acl(inode, acl);
3095 }
3096
3097 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3098 {
3099         struct page *pages[NFS4ACL_MAXPAGES];
3100         struct nfs_getaclargs args = {
3101                 .fh = NFS_FH(inode),
3102                 .acl_pages = pages,
3103                 .acl_len = buflen,
3104         };
3105         struct nfs_getaclres res = {
3106                 .acl_len = buflen,
3107         };
3108         void *resp_buf;
3109         struct rpc_message msg = {
3110                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3111                 .rpc_argp = &args,
3112                 .rpc_resp = &res,
3113         };
3114         struct page *localpage = NULL;
3115         int ret;
3116
3117         if (buflen < PAGE_SIZE) {
3118                 /* As long as we're doing a round trip to the server anyway,
3119                  * let's be prepared for a page of acl data. */
3120                 localpage = alloc_page(GFP_KERNEL);
3121                 resp_buf = page_address(localpage);
3122                 if (localpage == NULL)
3123                         return -ENOMEM;
3124                 args.acl_pages[0] = localpage;
3125                 args.acl_pgbase = 0;
3126                 args.acl_len = PAGE_SIZE;
3127         } else {
3128                 resp_buf = buf;
3129                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3130         }
3131         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3132         if (ret)
3133                 goto out_free;
3134         if (res.acl_len > args.acl_len)
3135                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3136         else
3137                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3138         if (buf) {
3139                 ret = -ERANGE;
3140                 if (res.acl_len > buflen)
3141                         goto out_free;
3142                 if (localpage)
3143                         memcpy(buf, resp_buf, res.acl_len);
3144         }
3145         ret = res.acl_len;
3146 out_free:
3147         if (localpage)
3148                 __free_page(localpage);
3149         return ret;
3150 }
3151
3152 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3153 {
3154         struct nfs4_exception exception = { };
3155         ssize_t ret;
3156         do {
3157                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3158                 if (ret >= 0)
3159                         break;
3160                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3161         } while (exception.retry);
3162         return ret;
3163 }
3164
3165 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3166 {
3167         struct nfs_server *server = NFS_SERVER(inode);
3168         int ret;
3169
3170         if (!nfs4_server_supports_acls(server))
3171                 return -EOPNOTSUPP;
3172         ret = nfs_revalidate_inode(server, inode);
3173         if (ret < 0)
3174                 return ret;
3175         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3176                 nfs_zap_acl_cache(inode);
3177         ret = nfs4_read_cached_acl(inode, buf, buflen);
3178         if (ret != -ENOENT)
3179                 return ret;
3180         return nfs4_get_acl_uncached(inode, buf, buflen);
3181 }
3182
3183 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3184 {
3185         struct nfs_server *server = NFS_SERVER(inode);
3186         struct page *pages[NFS4ACL_MAXPAGES];
3187         struct nfs_setaclargs arg = {
3188                 .fh             = NFS_FH(inode),
3189                 .acl_pages      = pages,
3190                 .acl_len        = buflen,
3191         };
3192         struct nfs_setaclres res;
3193         struct rpc_message msg = {
3194                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3195                 .rpc_argp       = &arg,
3196                 .rpc_resp       = &res,
3197         };
3198         int ret;
3199
3200         if (!nfs4_server_supports_acls(server))
3201                 return -EOPNOTSUPP;
3202         nfs_inode_return_delegation(inode);
3203         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3204         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3205         nfs_access_zap_cache(inode);
3206         nfs_zap_acl_cache(inode);
3207         return ret;
3208 }
3209
3210 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3211 {
3212         struct nfs4_exception exception = { };
3213         int err;
3214         do {
3215                 err = nfs4_handle_exception(NFS_SERVER(inode),
3216                                 __nfs4_proc_set_acl(inode, buf, buflen),
3217                                 &exception);
3218         } while (exception.retry);
3219         return err;
3220 }
3221
3222 static int
3223 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3224 {
3225         struct nfs_client *clp = server->nfs_client;
3226
3227         if (!clp || task->tk_status >= 0)
3228                 return 0;
3229         switch(task->tk_status) {
3230                 case -NFS4ERR_ADMIN_REVOKED:
3231                 case -NFS4ERR_BAD_STATEID:
3232                 case -NFS4ERR_OPENMODE:
3233                         if (state == NULL)
3234                                 break;
3235                         nfs4_state_mark_reclaim_nograce(clp, state);
3236                 case -NFS4ERR_STALE_CLIENTID:
3237                 case -NFS4ERR_STALE_STATEID:
3238                 case -NFS4ERR_EXPIRED:
3239                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3240                         nfs4_schedule_state_recovery(clp);
3241                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3242                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3243                         task->tk_status = 0;
3244                         return -EAGAIN;
3245                 case -NFS4ERR_DELAY:
3246                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3247                 case -NFS4ERR_GRACE:
3248                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3249                         task->tk_status = 0;
3250                         return -EAGAIN;
3251                 case -NFS4ERR_OLD_STATEID:
3252                         task->tk_status = 0;
3253                         return -EAGAIN;
3254         }
3255         task->tk_status = nfs4_map_errors(task->tk_status);
3256         return 0;
3257 }
3258
3259 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3260 {
3261         nfs4_verifier sc_verifier;
3262         struct nfs4_setclientid setclientid = {
3263                 .sc_verifier = &sc_verifier,
3264                 .sc_prog = program,
3265         };
3266         struct rpc_message msg = {
3267                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3268                 .rpc_argp = &setclientid,
3269                 .rpc_resp = clp,
3270                 .rpc_cred = cred,
3271         };
3272         __be32 *p;
3273         int loop = 0;
3274         int status;
3275
3276         p = (__be32*)sc_verifier.data;
3277         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3278         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3279
3280         for(;;) {
3281                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3282                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3283                                 clp->cl_ipaddr,
3284                                 rpc_peeraddr2str(clp->cl_rpcclient,
3285                                                         RPC_DISPLAY_ADDR),
3286                                 rpc_peeraddr2str(clp->cl_rpcclient,
3287                                                         RPC_DISPLAY_PROTO),
3288                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3289                                 clp->cl_id_uniquifier);
3290                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3291                                 sizeof(setclientid.sc_netid),
3292                                 rpc_peeraddr2str(clp->cl_rpcclient,
3293                                                         RPC_DISPLAY_NETID));
3294                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3295                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3296                                 clp->cl_ipaddr, port >> 8, port & 255);
3297
3298                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3299                 if (status != -NFS4ERR_CLID_INUSE)
3300                         break;
3301                 if (signalled())
3302                         break;
3303                 if (loop++ & 1)
3304                         ssleep(clp->cl_lease_time + 1);
3305                 else
3306                         if (++clp->cl_id_uniquifier == 0)
3307                                 break;
3308         }
3309         return status;
3310 }
3311
3312 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3313 {
3314         struct nfs_fsinfo fsinfo;
3315         struct rpc_message msg = {
3316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3317                 .rpc_argp = clp,
3318                 .rpc_resp = &fsinfo,
3319                 .rpc_cred = cred,
3320         };
3321         unsigned long now;
3322         int status;
3323
3324         now = jiffies;
3325         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3326         if (status == 0) {
3327                 spin_lock(&clp->cl_lock);
3328                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3329                 clp->cl_last_renewal = now;
3330                 spin_unlock(&clp->cl_lock);
3331         }
3332         return status;
3333 }
3334
3335 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3336 {
3337         long timeout = 0;
3338         int err;
3339         do {
3340                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3341                 switch (err) {
3342                         case 0:
3343                                 return err;
3344                         case -NFS4ERR_RESOURCE:
3345                                 /* The IBM lawyers misread another document! */
3346                         case -NFS4ERR_DELAY:
3347                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3348                 }
3349         } while (err == 0);
3350         return err;
3351 }
3352
3353 struct nfs4_delegreturndata {
3354         struct nfs4_delegreturnargs args;
3355         struct nfs4_delegreturnres res;
3356         struct nfs_fh fh;
3357         nfs4_stateid stateid;
3358         unsigned long timestamp;
3359         struct nfs_fattr fattr;
3360         int rpc_status;
3361 };
3362
3363 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3364 {
3365         struct nfs4_delegreturndata *data = calldata;
3366
3367         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3368                                      task->tk_status);
3369
3370         data->rpc_status = task->tk_status;
3371         if (data->rpc_status == 0)
3372                 renew_lease(data->res.server, data->timestamp);
3373 }
3374
3375 static void nfs4_delegreturn_release(void *calldata)
3376 {
3377         kfree(calldata);
3378 }
3379
3380 #if defined(CONFIG_NFS_V4_1)
3381 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3382 {
3383         struct nfs4_delegreturndata *d_data;
3384
3385         d_data = (struct nfs4_delegreturndata *)data;
3386
3387         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3388                                 &d_data->args.seq_args,
3389                                 &d_data->res.seq_res, 1, task))
3390                 return;
3391         rpc_call_start(task);
3392 }
3393 #endif /* CONFIG_NFS_V4_1 */
3394
3395 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3396 #if defined(CONFIG_NFS_V4_1)
3397         .rpc_call_prepare = nfs4_delegreturn_prepare,
3398 #endif /* CONFIG_NFS_V4_1 */
3399         .rpc_call_done = nfs4_delegreturn_done,
3400         .rpc_release = nfs4_delegreturn_release,
3401 };
3402
3403 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3404 {
3405         struct nfs4_delegreturndata *data;
3406         struct nfs_server *server = NFS_SERVER(inode);
3407         struct rpc_task *task;
3408         struct rpc_message msg = {
3409                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3410                 .rpc_cred = cred,
3411         };
3412         struct rpc_task_setup task_setup_data = {
3413                 .rpc_client = server->client,
3414                 .rpc_message = &msg,
3415                 .callback_ops = &nfs4_delegreturn_ops,
3416                 .flags = RPC_TASK_ASYNC,
3417         };
3418         int status = 0;
3419
3420         data = kzalloc(sizeof(*data), GFP_KERNEL);
3421         if (data == NULL)
3422                 return -ENOMEM;
3423         data->args.fhandle = &data->fh;
3424         data->args.stateid = &data->stateid;
3425         data->args.bitmask = server->attr_bitmask;
3426         nfs_copy_fh(&data->fh, NFS_FH(inode));
3427         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3428         data->res.fattr = &data->fattr;
3429         data->res.server = server;
3430         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3431         nfs_fattr_init(data->res.fattr);
3432         data->timestamp = jiffies;
3433         data->rpc_status = 0;
3434
3435         task_setup_data.callback_data = data;
3436         msg.rpc_argp = &data->args,
3437         msg.rpc_resp = &data->res,
3438         task = rpc_run_task(&task_setup_data);
3439         if (IS_ERR(task))
3440                 return PTR_ERR(task);
3441         if (!issync)
3442                 goto out;
3443         status = nfs4_wait_for_completion_rpc_task(task);
3444         if (status != 0)
3445                 goto out;
3446         status = data->rpc_status;
3447         if (status != 0)
3448                 goto out;
3449         nfs_refresh_inode(inode, &data->fattr);
3450 out:
3451         rpc_put_task(task);
3452         return status;
3453 }
3454
3455 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3456 {
3457         struct nfs_server *server = NFS_SERVER(inode);
3458         struct nfs4_exception exception = { };
3459         int err;
3460         do {
3461                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3462                 switch (err) {
3463                         case -NFS4ERR_STALE_STATEID:
3464                         case -NFS4ERR_EXPIRED:
3465                         case 0:
3466                                 return 0;
3467                 }
3468                 err = nfs4_handle_exception(server, err, &exception);
3469         } while (exception.retry);
3470         return err;
3471 }
3472
3473 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3474 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3475
3476 /*
3477  * sleep, with exponential backoff, and retry the LOCK operation.
3478  */
3479 static unsigned long
3480 nfs4_set_lock_task_retry(unsigned long timeout)
3481 {
3482         schedule_timeout_killable(timeout);
3483         timeout <<= 1;
3484         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3485                 return NFS4_LOCK_MAXTIMEOUT;
3486         return timeout;
3487 }
3488
3489 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3490 {
3491         struct inode *inode = state->inode;
3492         struct nfs_server *server = NFS_SERVER(inode);
3493         struct nfs_client *clp = server->nfs_client;
3494         struct nfs_lockt_args arg = {
3495                 .fh = NFS_FH(inode),
3496                 .fl = request,
3497         };
3498         struct nfs_lockt_res res = {
3499                 .denied = request,
3500         };
3501         struct rpc_message msg = {
3502                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3503                 .rpc_argp       = &arg,
3504                 .rpc_resp       = &res,
3505                 .rpc_cred       = state->owner->so_cred,
3506         };
3507         struct nfs4_lock_state *lsp;
3508         int status;
3509
3510         arg.lock_owner.clientid = clp->cl_clientid;
3511         status = nfs4_set_lock_state(state, request);
3512         if (status != 0)
3513                 goto out;
3514         lsp = request->fl_u.nfs4_fl.owner;
3515         arg.lock_owner.id = lsp->ls_id.id;
3516         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3517         switch (status) {
3518                 case 0:
3519                         request->fl_type = F_UNLCK;
3520                         break;
3521                 case -NFS4ERR_DENIED:
3522                         status = 0;
3523         }
3524         request->fl_ops->fl_release_private(request);
3525 out:
3526         return status;
3527 }
3528
3529 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3530 {
3531         struct nfs4_exception exception = { };
3532         int err;
3533
3534         do {
3535                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3536                                 _nfs4_proc_getlk(state, cmd, request),
3537                                 &exception);
3538         } while (exception.retry);
3539         return err;
3540 }
3541
3542 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3543 {
3544         int res = 0;
3545         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3546                 case FL_POSIX:
3547                         res = posix_lock_file_wait(file, fl);
3548                         break;
3549                 case FL_FLOCK:
3550                         res = flock_lock_file_wait(file, fl);
3551                         break;
3552                 default:
3553                         BUG();
3554         }
3555         return res;
3556 }
3557
3558 struct nfs4_unlockdata {
3559         struct nfs_locku_args arg;
3560         struct nfs_locku_res res;
3561         struct nfs4_lock_state *lsp;
3562         struct nfs_open_context *ctx;
3563         struct file_lock fl;
3564         const struct nfs_server *server;
3565         unsigned long timestamp;
3566 };
3567
3568 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3569                 struct nfs_open_context *ctx,
3570                 struct nfs4_lock_state *lsp,
3571                 struct nfs_seqid *seqid)
3572 {
3573         struct nfs4_unlockdata *p;
3574         struct inode *inode = lsp->ls_state->inode;
3575
3576         p = kzalloc(sizeof(*p), GFP_KERNEL);
3577         if (p == NULL)
3578                 return NULL;
3579         p->arg.fh = NFS_FH(inode);
3580         p->arg.fl = &p->fl;
3581         p->arg.seqid = seqid;
3582         p->res.seqid = seqid;
3583         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3584         p->arg.stateid = &lsp->ls_stateid;
3585         p->lsp = lsp;
3586         atomic_inc(&lsp->ls_count);
3587         /* Ensure we don't close file until we're done freeing locks! */
3588         p->ctx = get_nfs_open_context(ctx);
3589         memcpy(&p->fl, fl, sizeof(p->fl));
3590         p->server = NFS_SERVER(inode);
3591         return p;
3592 }
3593
3594 static void nfs4_locku_release_calldata(void *data)
3595 {
3596         struct nfs4_unlockdata *calldata = data;
3597         nfs_free_seqid(calldata->arg.seqid);
3598         nfs4_put_lock_state(calldata->lsp);
3599         put_nfs_open_context(calldata->ctx);
3600         kfree(calldata);
3601 }
3602
3603 static void nfs4_locku_done(struct rpc_task *task, void *data)
3604 {
3605         struct nfs4_unlockdata *calldata = data;
3606
3607         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3608                            task->tk_status);
3609         if (RPC_ASSASSINATED(task))
3610                 return;
3611         switch (task->tk_status) {
3612                 case 0:
3613                         memcpy(calldata->lsp->ls_stateid.data,
3614                                         calldata->res.stateid.data,
3615                                         sizeof(calldata->lsp->ls_stateid.data));
3616                         renew_lease(calldata->server, calldata->timestamp);
3617                         break;
3618                 case -NFS4ERR_BAD_STATEID:
3619                 case -NFS4ERR_OLD_STATEID:
3620                 case -NFS4ERR_STALE_STATEID:
3621                 case -NFS4ERR_EXPIRED:
3622                         break;
3623                 default:
3624                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3625                                 rpc_restart_call(task);
3626         }
3627         nfs4_sequence_free_slot(calldata->server->nfs_client,
3628                                 &calldata->res.seq_res);
3629 }
3630
3631 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3632 {
3633         struct nfs4_unlockdata *calldata = data;
3634
3635         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3636                 return;
3637         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3638                 /* Note: exit _without_ running nfs4_locku_done */
3639                 task->tk_action = NULL;
3640                 return;
3641         }
3642         calldata->timestamp = jiffies;
3643         if (nfs4_setup_sequence(calldata->server->nfs_client,
3644                                 &calldata->arg.seq_args,
3645                                 &calldata->res.seq_res, 1, task))
3646                 return;
3647         rpc_call_start(task);
3648 }
3649
3650 static const struct rpc_call_ops nfs4_locku_ops = {
3651         .rpc_call_prepare = nfs4_locku_prepare,
3652         .rpc_call_done = nfs4_locku_done,
3653         .rpc_release = nfs4_locku_release_calldata,
3654 };
3655
3656 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3657                 struct nfs_open_context *ctx,
3658                 struct nfs4_lock_state *lsp,
3659                 struct nfs_seqid *seqid)
3660 {
3661         struct nfs4_unlockdata *data;
3662         struct rpc_message msg = {
3663                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3664                 .rpc_cred = ctx->cred,
3665         };
3666         struct rpc_task_setup task_setup_data = {
3667                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3668                 .rpc_message = &msg,
3669                 .callback_ops = &nfs4_locku_ops,
3670                 .workqueue = nfsiod_workqueue,
3671                 .flags = RPC_TASK_ASYNC,
3672         };
3673
3674         /* Ensure this is an unlock - when canceling a lock, the
3675          * canceled lock is passed in, and it won't be an unlock.
3676          */
3677         fl->fl_type = F_UNLCK;
3678
3679         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3680         if (data == NULL) {
3681                 nfs_free_seqid(seqid);
3682                 return ERR_PTR(-ENOMEM);
3683         }
3684
3685         msg.rpc_argp = &data->arg,
3686         msg.rpc_resp = &data->res,
3687         task_setup_data.callback_data = data;
3688         return rpc_run_task(&task_setup_data);
3689 }
3690
3691 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3692 {
3693         struct nfs_inode *nfsi = NFS_I(state->inode);
3694         struct nfs_seqid *seqid;
3695         struct nfs4_lock_state *lsp;
3696         struct rpc_task *task;
3697         int status = 0;
3698         unsigned char fl_flags = request->fl_flags;
3699
3700         status = nfs4_set_lock_state(state, request);
3701         /* Unlock _before_ we do the RPC call */
3702         request->fl_flags |= FL_EXISTS;
3703         down_read(&nfsi->rwsem);
3704         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3705                 up_read(&nfsi->rwsem);
3706                 goto out;
3707         }
3708         up_read(&nfsi->rwsem);
3709         if (status != 0)
3710                 goto out;
3711         /* Is this a delegated lock? */
3712         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3713                 goto out;
3714         lsp = request->fl_u.nfs4_fl.owner;
3715         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3716         status = -ENOMEM;
3717         if (seqid == NULL)
3718                 goto out;
3719         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3720         status = PTR_ERR(task);
3721         if (IS_ERR(task))
3722                 goto out;
3723         status = nfs4_wait_for_completion_rpc_task(task);
3724         rpc_put_task(task);
3725 out:
3726         request->fl_flags = fl_flags;
3727         return status;
3728 }
3729
3730 struct nfs4_lockdata {
3731         struct nfs_lock_args arg;
3732         struct nfs_lock_res res;
3733         struct nfs4_lock_state *lsp;
3734         struct nfs_open_context *ctx;
3735         struct file_lock fl;
3736         unsigned long timestamp;
3737         int rpc_status;
3738         int cancelled;
3739         struct nfs_server *server;
3740 };
3741
3742 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3743                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3744 {
3745         struct nfs4_lockdata *p;
3746         struct inode *inode = lsp->ls_state->inode;
3747         struct nfs_server *server = NFS_SERVER(inode);
3748
3749         p = kzalloc(sizeof(*p), GFP_KERNEL);
3750         if (p == NULL)
3751                 return NULL;
3752
3753         p->arg.fh = NFS_FH(inode);
3754         p->arg.fl = &p->fl;
3755         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3756         if (p->arg.open_seqid == NULL)
3757                 goto out_free;
3758         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3759         if (p->arg.lock_seqid == NULL)
3760                 goto out_free_seqid;
3761         p->arg.lock_stateid = &lsp->ls_stateid;
3762         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3763         p->arg.lock_owner.id = lsp->ls_id.id;
3764         p->res.lock_seqid = p->arg.lock_seqid;
3765         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3766         p->lsp = lsp;
3767         p->server = server;
3768         atomic_inc(&lsp->ls_count);
3769         p->ctx = get_nfs_open_context(ctx);
3770         memcpy(&p->fl, fl, sizeof(p->fl));
3771         return p;
3772 out_free_seqid:
3773         nfs_free_seqid(p->arg.open_seqid);
3774 out_free:
3775         kfree(p);
3776         return NULL;
3777 }
3778
3779 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3780 {
3781         struct nfs4_lockdata *data = calldata;
3782         struct nfs4_state *state = data->lsp->ls_state;
3783
3784         dprintk("%s: begin!\n", __func__);
3785         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3786                 return;
3787         /* Do we need to do an open_to_lock_owner? */
3788         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3789                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3790                         return;
3791                 data->arg.open_stateid = &state->stateid;
3792                 data->arg.new_lock_owner = 1;
3793                 data->res.open_seqid = data->arg.open_seqid;
3794         } else
3795                 data->arg.new_lock_owner = 0;
3796         data->timestamp = jiffies;
3797         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3798                                 &data->res.seq_res, 1, task))
3799                 return;
3800         rpc_call_start(task);
3801         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3802 }
3803
3804 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3805 {
3806         struct nfs4_lockdata *data = calldata;
3807
3808         dprintk("%s: begin!\n", __func__);
3809
3810         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3811                                      task->tk_status);
3812
3813         data->rpc_status = task->tk_status;
3814         if (RPC_ASSASSINATED(task))
3815                 goto out;
3816         if (data->arg.new_lock_owner != 0) {
3817                 if (data->rpc_status == 0)
3818                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3819                 else
3820                         goto out;
3821         }
3822         if (data->rpc_status == 0) {
3823                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3824                                         sizeof(data->lsp->ls_stateid.data));
3825                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3826                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3827         }
3828 out:
3829         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3830 }
3831
3832 static void nfs4_lock_release(void *calldata)
3833 {
3834         struct nfs4_lockdata *data = calldata;
3835
3836         dprintk("%s: begin!\n", __func__);
3837         nfs_free_seqid(data->arg.open_seqid);
3838         if (data->cancelled != 0) {
3839                 struct rpc_task *task;
3840                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3841                                 data->arg.lock_seqid);
3842                 if (!IS_ERR(task))
3843                         rpc_put_task(task);
3844                 dprintk("%s: cancelling lock!\n", __func__);
3845         } else
3846                 nfs_free_seqid(data->arg.lock_seqid);
3847         nfs4_put_lock_state(data->lsp);
3848         put_nfs_open_context(data->ctx);
3849         kfree(data);
3850         dprintk("%s: done!\n", __func__);
3851 }
3852
3853 static const struct rpc_call_ops nfs4_lock_ops = {
3854         .rpc_call_prepare = nfs4_lock_prepare,
3855         .rpc_call_done = nfs4_lock_done,
3856         .rpc_release = nfs4_lock_release,
3857 };
3858
3859 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3860 {
3861         struct nfs4_lockdata *data;
3862         struct rpc_task *task;
3863         struct rpc_message msg = {
3864                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3865                 .rpc_cred = state->owner->so_cred,
3866         };
3867         struct rpc_task_setup task_setup_data = {
3868                 .rpc_client = NFS_CLIENT(state->inode),
3869                 .rpc_message = &msg,
3870                 .callback_ops = &nfs4_lock_ops,
3871                 .workqueue = nfsiod_workqueue,
3872                 .flags = RPC_TASK_ASYNC,
3873         };
3874         int ret;
3875
3876         dprintk("%s: begin!\n", __func__);
3877         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3878                         fl->fl_u.nfs4_fl.owner);
3879         if (data == NULL)
3880                 return -ENOMEM;
3881         if (IS_SETLKW(cmd))
3882                 data->arg.block = 1;
3883         if (reclaim != 0)
3884                 data->arg.reclaim = 1;
3885         msg.rpc_argp = &data->arg,
3886         msg.rpc_resp = &data->res,
3887         task_setup_data.callback_data = data;
3888         task = rpc_run_task(&task_setup_data);
3889         if (IS_ERR(task))
3890                 return PTR_ERR(task);
3891         ret = nfs4_wait_for_completion_rpc_task(task);
3892         if (ret == 0) {
3893                 ret = data->rpc_status;
3894                 if (ret == -NFS4ERR_DENIED)
3895                         ret = -EAGAIN;
3896         } else
3897                 data->cancelled = 1;
3898         rpc_put_task(task);
3899         dprintk("%s: done, ret = %d!\n", __func__, ret);
3900         return ret;
3901 }
3902
3903 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3904 {
3905         struct nfs_server *server = NFS_SERVER(state->inode);
3906         struct nfs4_exception exception = { };
3907         int err;
3908
3909         do {
3910                 /* Cache the lock if possible... */
3911                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3912                         return 0;
3913                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3914                 if (err != -NFS4ERR_DELAY)
3915                         break;
3916                 nfs4_handle_exception(server, err, &exception);
3917         } while (exception.retry);
3918         return err;
3919 }
3920
3921 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3922 {
3923         struct nfs_server *server = NFS_SERVER(state->inode);
3924         struct nfs4_exception exception = { };
3925         int err;
3926
3927         err = nfs4_set_lock_state(state, request);
3928         if (err != 0)
3929                 return err;
3930         do {
3931                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3932                         return 0;
3933                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3934                 if (err != -NFS4ERR_DELAY)
3935                         break;
3936                 nfs4_handle_exception(server, err, &exception);
3937         } while (exception.retry);
3938         return err;
3939 }
3940
3941 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3942 {
3943         struct nfs_inode *nfsi = NFS_I(state->inode);
3944         unsigned char fl_flags = request->fl_flags;
3945         int status;
3946
3947         /* Is this a delegated open? */
3948         status = nfs4_set_lock_state(state, request);
3949         if (status != 0)
3950                 goto out;
3951         request->fl_flags |= FL_ACCESS;
3952         status = do_vfs_lock(request->fl_file, request);
3953         if (status < 0)
3954                 goto out;
3955         down_read(&nfsi->rwsem);
3956         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3957                 /* Yes: cache locks! */
3958                 /* ...but avoid races with delegation recall... */
3959                 request->fl_flags = fl_flags & ~FL_SLEEP;
3960                 status = do_vfs_lock(request->fl_file, request);
3961                 goto out_unlock;
3962         }
3963         status = _nfs4_do_setlk(state, cmd, request, 0);
3964         if (status != 0)
3965                 goto out_unlock;
3966         /* Note: we always want to sleep here! */
3967         request->fl_flags = fl_flags | FL_SLEEP;
3968         if (do_vfs_lock(request->fl_file, request) < 0)
3969                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3970 out_unlock:
3971         up_read(&nfsi->rwsem);
3972 out:
3973         request->fl_flags = fl_flags;
3974         return status;
3975 }
3976
3977 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3978 {
3979         struct nfs4_exception exception = { };
3980         int err;
3981
3982         do {
3983                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3984                                 _nfs4_proc_setlk(state, cmd, request),
3985                                 &exception);
3986         } while (exception.retry);
3987         return err;
3988 }
3989
3990 static int
3991 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3992 {
3993         struct nfs_open_context *ctx;
3994         struct nfs4_state *state;
3995         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3996         int status;
3997
3998         /* verify open state */
3999         ctx = nfs_file_open_context(filp);
4000         state = ctx->state;
4001
4002         if (request->fl_start < 0 || request->fl_end < 0)
4003                 return -EINVAL;
4004
4005         if (IS_GETLK(cmd))
4006                 return nfs4_proc_getlk(state, F_GETLK, request);
4007
4008         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4009                 return -EINVAL;
4010
4011         if (request->fl_type == F_UNLCK)
4012                 return nfs4_proc_unlck(state, cmd, request);
4013
4014         do {
4015                 status = nfs4_proc_setlk(state, cmd, request);
4016                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4017                         break;
4018                 timeout = nfs4_set_lock_task_retry(timeout);
4019                 status = -ERESTARTSYS;
4020                 if (signalled())
4021                         break;
4022         } while(status < 0);
4023         return status;
4024 }
4025
4026 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4027 {
4028         struct nfs_server *server = NFS_SERVER(state->inode);
4029         struct nfs4_exception exception = { };
4030         int err;
4031
4032         err = nfs4_set_lock_state(state, fl);
4033         if (err != 0)
4034                 goto out;
4035         do {
4036                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4037                 if (err != -NFS4ERR_DELAY)
4038                         break;
4039                 err = nfs4_handle_exception(server, err, &exception);
4040         } while (exception.retry);
4041 out:
4042         return err;
4043 }
4044
4045 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4046
4047 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4048                 size_t buflen, int flags)
4049 {
4050         struct inode *inode = dentry->d_inode;
4051
4052         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4053                 return -EOPNOTSUPP;
4054
4055         return nfs4_proc_set_acl(inode, buf, buflen);
4056 }
4057
4058 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4059  * and that's what we'll do for e.g. user attributes that haven't been set.
4060  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4061  * attributes in kernel-managed attribute namespaces. */
4062 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4063                 size_t buflen)
4064 {
4065         struct inode *inode = dentry->d_inode;
4066
4067         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4068                 return -EOPNOTSUPP;
4069
4070         return nfs4_proc_get_acl(inode, buf, buflen);
4071 }
4072
4073 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4074 {
4075         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4076
4077         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4078                 return 0;
4079         if (buf && buflen < len)
4080                 return -ERANGE;
4081         if (buf)
4082                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4083         return len;
4084 }
4085
4086 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4087 {
4088         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4089                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4090                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4091                 return;
4092
4093         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4094                 NFS_ATTR_FATTR_NLINK;
4095         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4096         fattr->nlink = 2;
4097 }
4098
4099 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4100                 struct nfs4_fs_locations *fs_locations, struct page *page)
4101 {
4102         struct nfs_server *server = NFS_SERVER(dir);
4103         u32 bitmask[2] = {
4104                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4105                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4106         };
4107         struct nfs4_fs_locations_arg args = {
4108                 .dir_fh = NFS_FH(dir),
4109                 .name = name,
4110                 .page = page,
4111                 .bitmask = bitmask,
4112         };
4113         struct nfs4_fs_locations_res res = {
4114                 .fs_locations = fs_locations,
4115         };
4116         struct rpc_message msg = {
4117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4118                 .rpc_argp = &args,
4119                 .rpc_resp = &res,
4120         };
4121         int status;
4122
4123         dprintk("%s: start\n", __func__);
4124         nfs_fattr_init(&fs_locations->fattr);
4125         fs_locations->server = server;
4126         fs_locations->nlocations = 0;
4127         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4128         nfs_fixup_referral_attributes(&fs_locations->fattr);
4129         dprintk("%s: returned status = %d\n", __func__, status);
4130         return status;
4131 }
4132
4133 #ifdef CONFIG_NFS_V4_1
4134 /*
4135  * nfs4_proc_exchange_id()
4136  *
4137  * Since the clientid has expired, all compounds using sessions
4138  * associated with the stale clientid will be returning
4139  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4140  * be in some phase of session reset.
4141  */
4142 static int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4143 {
4144         nfs4_verifier verifier;
4145         struct nfs41_exchange_id_args args = {
4146                 .client = clp,
4147                 .flags = clp->cl_exchange_flags,
4148         };
4149         struct nfs41_exchange_id_res res = {
4150                 .client = clp,
4151         };
4152         int status;
4153         struct rpc_message msg = {
4154                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4155                 .rpc_argp = &args,
4156                 .rpc_resp = &res,
4157                 .rpc_cred = cred,
4158         };
4159         __be32 *p;
4160
4161         dprintk("--> %s\n", __func__);
4162         BUG_ON(clp == NULL);
4163         p = (u32 *)verifier.data;
4164         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4165         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4166         args.verifier = &verifier;
4167
4168         while (1) {
4169                 args.id_len = scnprintf(args.id, sizeof(args.id),
4170                                         "%s/%s %u",
4171                                         clp->cl_ipaddr,
4172                                         rpc_peeraddr2str(clp->cl_rpcclient,
4173                                                          RPC_DISPLAY_ADDR),
4174                                         clp->cl_id_uniquifier);
4175
4176                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4177
4178                 if (status != NFS4ERR_CLID_INUSE)
4179                         break;
4180
4181                 if (signalled())
4182                         break;
4183
4184                 if (++clp->cl_id_uniquifier == 0)
4185                         break;
4186         }
4187
4188         dprintk("<-- %s status= %d\n", __func__, status);
4189         return status;
4190 }
4191
4192 /* Destroy the slot table */
4193 static void nfs4_destroy_slot_table(struct nfs4_session *session)
4194 {
4195         if (session->fc_slot_table.slots == NULL)
4196                 return;
4197         kfree(session->fc_slot_table.slots);
4198         session->fc_slot_table.slots = NULL;
4199         return;
4200 }
4201
4202 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4203 {
4204         struct nfs4_session *session;
4205         struct nfs4_slot_table *tbl;
4206
4207         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4208         if (!session)
4209                 return NULL;
4210         tbl = &session->fc_slot_table;
4211         spin_lock_init(&tbl->slot_tbl_lock);
4212         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "Slot table");
4213         session->clp = clp;
4214         return session;
4215 }
4216
4217 void nfs4_destroy_session(struct nfs4_session *session)
4218 {
4219         nfs4_destroy_slot_table(session);
4220         kfree(session);
4221 }
4222
4223 #endif /* CONFIG_NFS_V4_1 */
4224
4225 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
4226         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4227         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4228         .recover_open   = nfs4_open_reclaim,
4229         .recover_lock   = nfs4_lock_reclaim,
4230 };
4231
4232 struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
4233         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4234         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4235         .recover_open   = nfs4_open_expired,
4236         .recover_lock   = nfs4_lock_expired,
4237 };
4238
4239 static const struct inode_operations nfs4_file_inode_operations = {
4240         .permission     = nfs_permission,
4241         .getattr        = nfs_getattr,
4242         .setattr        = nfs_setattr,
4243         .getxattr       = nfs4_getxattr,
4244         .setxattr       = nfs4_setxattr,
4245         .listxattr      = nfs4_listxattr,
4246 };
4247
4248 const struct nfs_rpc_ops nfs_v4_clientops = {
4249         .version        = 4,                    /* protocol version */
4250         .dentry_ops     = &nfs4_dentry_operations,
4251         .dir_inode_ops  = &nfs4_dir_inode_operations,
4252         .file_inode_ops = &nfs4_file_inode_operations,
4253         .getroot        = nfs4_proc_get_root,
4254         .getattr        = nfs4_proc_getattr,
4255         .setattr        = nfs4_proc_setattr,
4256         .lookupfh       = nfs4_proc_lookupfh,
4257         .lookup         = nfs4_proc_lookup,
4258         .access         = nfs4_proc_access,
4259         .readlink       = nfs4_proc_readlink,
4260         .create         = nfs4_proc_create,
4261         .remove         = nfs4_proc_remove,
4262         .unlink_setup   = nfs4_proc_unlink_setup,
4263         .unlink_done    = nfs4_proc_unlink_done,
4264         .rename         = nfs4_proc_rename,
4265         .link           = nfs4_proc_link,
4266         .symlink        = nfs4_proc_symlink,
4267         .mkdir          = nfs4_proc_mkdir,
4268         .rmdir          = nfs4_proc_remove,
4269         .readdir        = nfs4_proc_readdir,
4270         .mknod          = nfs4_proc_mknod,
4271         .statfs         = nfs4_proc_statfs,
4272         .fsinfo         = nfs4_proc_fsinfo,
4273         .pathconf       = nfs4_proc_pathconf,
4274         .set_capabilities = nfs4_server_capabilities,
4275         .decode_dirent  = nfs4_decode_dirent,
4276         .read_setup     = nfs4_proc_read_setup,
4277         .read_done      = nfs4_read_done,
4278         .write_setup    = nfs4_proc_write_setup,
4279         .write_done     = nfs4_write_done,
4280         .commit_setup   = nfs4_proc_commit_setup,
4281         .commit_done    = nfs4_commit_done,
4282         .lock           = nfs4_proc_lock,
4283         .clear_acl_cache = nfs4_zap_acl_attr,
4284         .close_context  = nfs4_close_context,
4285 };
4286
4287 /*
4288  * Local variables:
4289  *  c-basic-offset: 8
4290  * End:
4291  */