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
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __FUNCTION__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 197 {
 198         struct nfs_client *clp = server->nfs_client;
 199         spin_lock(&clp->cl_lock);
 200         if (time_before(clp->cl_last_renewal,timestamp))
 201                 clp->cl_last_renewal = timestamp;
 202         spin_unlock(&clp->cl_lock);
 203 }
 204
 205 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 206 {
 207         struct nfs_inode *nfsi = NFS_I(dir);
 208
 209         spin_lock(&dir->i_lock);
 210         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 211         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 212                 nfsi->change_attr = cinfo->after;
 213         spin_unlock(&dir->i_lock);
 214 }
 215
 216 struct nfs4_opendata {
 217         atomic_t count;
 218         struct nfs_openargs o_arg;
 219         struct nfs_openres o_res;
 220         struct nfs_open_confirmargs c_arg;
 221         struct nfs_open_confirmres c_res;
 222         struct nfs_fattr f_attr;
 223         struct nfs_fattr dir_attr;
 224         struct path path;
 225         struct dentry *dir;
 226         struct nfs4_state_owner *owner;
 227         struct iattr attrs;
 228         unsigned long timestamp;
 229         int rpc_status;
 230         int cancelled;
 231 };
 232
 233 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 234                 struct nfs4_state_owner *sp, int flags,
 235                 const struct iattr *attrs)
 236 {
 237         struct dentry *parent = dget_parent(path->dentry);
 238         struct inode *dir = parent->d_inode;
 239         struct nfs_server *server = NFS_SERVER(dir);
 240         struct nfs4_opendata *p;
 241
 242         p = kzalloc(sizeof(*p), GFP_KERNEL);
 243         if (p == NULL)
 244                 goto err;
 245         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 246         if (p->o_arg.seqid == NULL)
 247                 goto err_free;
 248         atomic_set(&p->count, 1);
 249         p->path.mnt = mntget(path->mnt);
 250         p->path.dentry = dget(path->dentry);
 251         p->dir = parent;
 252         p->owner = sp;
 253         atomic_inc(&sp->so_count);
 254         p->o_arg.fh = NFS_FH(dir);
 255         p->o_arg.open_flags = flags,
 256         p->o_arg.clientid = server->nfs_client->cl_clientid;
 257         p->o_arg.id = sp->so_id;
 258         p->o_arg.name = &p->path.dentry->d_name;
 259         p->o_arg.server = server;
 260         p->o_arg.bitmask = server->attr_bitmask;
 261         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 262         p->o_res.f_attr = &p->f_attr;
 263         p->o_res.dir_attr = &p->dir_attr;
 264         p->o_res.server = server;
 265         nfs_fattr_init(&p->f_attr);
 266         nfs_fattr_init(&p->dir_attr);
 267         if (flags & O_EXCL) {
 268                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 269                 s[0] = jiffies;
 270                 s[1] = current->pid;
 271         } else if (flags & O_CREAT) {
 272                 p->o_arg.u.attrs = &p->attrs;
 273                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 274         }
 275         p->c_arg.fh = &p->o_res.fh;
 276         p->c_arg.stateid = &p->o_res.stateid;
 277         p->c_arg.seqid = p->o_arg.seqid;
 278         return p;
 279 err_free:
 280         kfree(p);
 281 err:
 282         dput(parent);
 283         return NULL;
 284 }
 285
 286 static void nfs4_opendata_free(struct nfs4_opendata *p)
 287 {
 288         if (p != NULL && atomic_dec_and_test(&p->count)) {
 289                 nfs_free_seqid(p->o_arg.seqid);
 290                 nfs4_put_state_owner(p->owner);
 291                 dput(p->dir);
 292                 dput(p->path.dentry);
 293                 mntput(p->path.mnt);
 294                 kfree(p);
 295         }
 296 }
 297
 298 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 299 {
 300         sigset_t oldset;
 301         int ret;
 302
 303         rpc_clnt_sigmask(task->tk_client, &oldset);
 304         ret = rpc_wait_for_completion_task(task);
 305         rpc_clnt_sigunmask(task->tk_client, &oldset);
 306         return ret;
 307 }
 308
 309 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 310 {
 311         switch (open_flags) {
 312                 case FMODE_WRITE:
 313                         state->n_wronly++;
 314                         break;
 315                 case FMODE_READ:
 316                         state->n_rdonly++;
 317                         break;
 318                 case FMODE_READ|FMODE_WRITE:
 319                         state->n_rdwr++;
 320         }
 321 }
 322
 323 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 324 {
 325         struct inode *inode = state->inode;
 326
 327         open_flags &= (FMODE_READ|FMODE_WRITE);
 328         /* Protect against nfs4_find_state_byowner() */
 329         spin_lock(&state->owner->so_lock);
 330         spin_lock(&inode->i_lock);
 331         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 332         update_open_stateflags(state, open_flags);
 333         nfs4_state_set_mode_locked(state, state->state | open_flags);
 334         spin_unlock(&inode->i_lock);
 335         spin_unlock(&state->owner->so_lock);
 336 }
 337
 338 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 339 {
 340         struct inode *inode;
 341         struct nfs4_state *state = NULL;
 342
 343         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 344                 goto out;
 345         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 346         if (IS_ERR(inode))
 347                 goto out;
 348         state = nfs4_get_open_state(inode, data->owner);
 349         if (state == NULL)
 350                 goto put_inode;
 351         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 352 put_inode:
 353         iput(inode);
 354 out:
 355         return state;
 356 }
 357
 358 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 359 {
 360         struct nfs_inode *nfsi = NFS_I(state->inode);
 361         struct nfs_open_context *ctx;
 362
 363         spin_lock(&state->inode->i_lock);
 364         list_for_each_entry(ctx, &nfsi->open_files, list) {
 365                 if (ctx->state != state)
 366                         continue;
 367                 get_nfs_open_context(ctx);
 368                 spin_unlock(&state->inode->i_lock);
 369                 return ctx;
 370         }
 371         spin_unlock(&state->inode->i_lock);
 372         return ERR_PTR(-ENOENT);
 373 }
 374
 375 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 376 {
 377         int ret;
 378
 379         opendata->o_arg.open_flags = openflags;
 380         ret = _nfs4_proc_open(opendata);
 381         if (ret != 0)
 382                 return ret;
 383         memcpy(stateid->data, opendata->o_res.stateid.data,
 384                         sizeof(stateid->data));
 385         return 0;
 386 }
 387
 388 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 389 {
 390         nfs4_stateid stateid;
 391         struct nfs4_state *newstate;
 392         int mode = 0;
 393         int delegation = 0;
 394         int ret;
 395
 396         /* memory barrier prior to reading state->n_* */
 397         smp_rmb();
 398         if (state->n_rdwr != 0) {
 399                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 400                 if (ret != 0)
 401                         return ret;
 402                 mode |= FMODE_READ|FMODE_WRITE;
 403                 if (opendata->o_res.delegation_type != 0)
 404                         delegation = opendata->o_res.delegation_type;
 405                 smp_rmb();
 406         }
 407         if (state->n_wronly != 0) {
 408                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 409                 if (ret != 0)
 410                         return ret;
 411                 mode |= FMODE_WRITE;
 412                 if (opendata->o_res.delegation_type != 0)
 413                         delegation = opendata->o_res.delegation_type;
 414                 smp_rmb();
 415         }
 416         if (state->n_rdonly != 0) {
 417                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 418                 if (ret != 0)
 419                         return ret;
 420                 mode |= FMODE_READ;
 421         }
 422         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 423         if (mode == 0)
 424                 return 0;
 425         if (opendata->o_res.delegation_type == 0)
 426                 opendata->o_res.delegation_type = delegation;
 427         opendata->o_arg.open_flags |= mode;
 428         newstate = nfs4_opendata_to_nfs4_state(opendata);
 429         if (newstate != NULL) {
 430                 if (opendata->o_res.delegation_type != 0) {
 431                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 432                         int delegation_flags = 0;
 433                         if (nfsi->delegation)
 434                                 delegation_flags = nfsi->delegation->flags;
 435                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 436                                 nfs_inode_set_delegation(newstate->inode,
 437                                                 opendata->owner->so_cred,
 438                                                 &opendata->o_res);
 439                         else
 440                                 nfs_inode_reclaim_delegation(newstate->inode,
 441                                                 opendata->owner->so_cred,
 442                                                 &opendata->o_res);
 443                 }
 444                 nfs4_close_state(&opendata->path, newstate, opendata->o_arg.open_flags);
 445         }
 446         if (newstate != state)
 447                 return -ESTALE;
 448         return 0;
 449 }
 450
 451 /*
 452  * OPEN_RECLAIM:
 453  *      reclaim state on the server after a reboot.
 454  */
 455 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 456 {
 457         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 458         struct nfs4_opendata *opendata;
 459         int delegation_type = 0;
 460         int status;
 461
 462         if (delegation != NULL) {
 463                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 464                         memcpy(&state->stateid, &delegation->stateid,
 465                                         sizeof(state->stateid));
 466                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 467                         return 0;
 468                 }
 469                 delegation_type = delegation->type;
 470         }
 471         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 472         if (opendata == NULL)
 473                 return -ENOMEM;
 474         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 475         opendata->o_arg.fh = NFS_FH(state->inode);
 476         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 477         opendata->o_arg.u.delegation_type = delegation_type;
 478         status = nfs4_open_recover(opendata, state);
 479         nfs4_opendata_free(opendata);
 480         return status;
 481 }
 482
 483 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 484 {
 485         struct nfs_server *server = NFS_SERVER(state->inode);
 486         struct nfs4_exception exception = { };
 487         int err;
 488         do {
 489                 err = _nfs4_do_open_reclaim(ctx, state);
 490                 if (err != -NFS4ERR_DELAY)
 491                         break;
 492                 nfs4_handle_exception(server, err, &exception);
 493         } while (exception.retry);
 494         return err;
 495 }
 496
 497 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 498 {
 499         struct nfs_open_context *ctx;
 500         int ret;
 501
 502         ctx = nfs4_state_find_open_context(state);
 503         if (IS_ERR(ctx))
 504                 return PTR_ERR(ctx);
 505         ret = nfs4_do_open_reclaim(ctx, state);
 506         put_nfs_open_context(ctx);
 507         return ret;
 508 }
 509
 510 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state)
 511 {
 512         struct nfs4_state_owner  *sp  = state->owner;
 513         struct nfs4_opendata *opendata;
 514         int ret;
 515
 516         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 517                 return 0;
 518         opendata = nfs4_opendata_alloc(&ctx->path, sp, 0, NULL);
 519         if (opendata == NULL)
 520                 return -ENOMEM;
 521         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 522         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 523                         sizeof(opendata->o_arg.u.delegation.data));
 524         ret = nfs4_open_recover(opendata, state);
 525         nfs4_opendata_free(opendata);
 526         return ret;
 527 }
 528
 529 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state)
 530 {
 531         struct nfs4_exception exception = { };
 532         struct nfs_server *server = NFS_SERVER(state->inode);
 533         int err;
 534         do {
 535                 err = _nfs4_open_delegation_recall(ctx, state);
 536                 switch (err) {
 537                         case 0:
 538                                 return err;
 539                         case -NFS4ERR_STALE_CLIENTID:
 540                         case -NFS4ERR_STALE_STATEID:
 541                         case -NFS4ERR_EXPIRED:
 542                                 /* Don't recall a delegation if it was lost */
 543                                 nfs4_schedule_state_recovery(server->nfs_client);
 544                                 return err;
 545                 }
 546                 err = nfs4_handle_exception(server, err, &exception);
 547         } while (exception.retry);
 548         return err;
 549 }
 550
 551 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 552 {
 553         struct nfs4_opendata *data = calldata;
 554         struct  rpc_message msg = {
 555                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 556                 .rpc_argp = &data->c_arg,
 557                 .rpc_resp = &data->c_res,
 558                 .rpc_cred = data->owner->so_cred,
 559         };
 560         data->timestamp = jiffies;
 561         rpc_call_setup(task, &msg, 0);
 562 }
 563
 564 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 565 {
 566         struct nfs4_opendata *data = calldata;
 567
 568         data->rpc_status = task->tk_status;
 569         if (RPC_ASSASSINATED(task))
 570                 return;
 571         if (data->rpc_status == 0) {
 572                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 573                                 sizeof(data->o_res.stateid.data));
 574                 renew_lease(data->o_res.server, data->timestamp);
 575         }
 576         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 577         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 578 }
 579
 580 static void nfs4_open_confirm_release(void *calldata)
 581 {
 582         struct nfs4_opendata *data = calldata;
 583         struct nfs4_state *state = NULL;
 584
 585         /* If this request hasn't been cancelled, do nothing */
 586         if (data->cancelled == 0)
 587                 goto out_free;
 588         /* In case of error, no cleanup! */
 589         if (data->rpc_status != 0)
 590                 goto out_free;
 591         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 592         state = nfs4_opendata_to_nfs4_state(data);
 593         if (state != NULL)
 594                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 595 out_free:
 596         nfs4_opendata_free(data);
 597 }
 598
 599 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 600         .rpc_call_prepare = nfs4_open_confirm_prepare,
 601         .rpc_call_done = nfs4_open_confirm_done,
 602         .rpc_release = nfs4_open_confirm_release,
 603 };
 604
 605 /*
 606  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 607  */
 608 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 609 {
 610         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 611         struct rpc_task *task;
 612         int status;
 613
 614         atomic_inc(&data->count);
 615         /*
 616          * If rpc_run_task() ends up calling ->rpc_release(), we
 617          * want to ensure that it takes the 'error' code path.
 618          */
 619         data->rpc_status = -ENOMEM;
 620         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 621         if (IS_ERR(task))
 622                 return PTR_ERR(task);
 623         status = nfs4_wait_for_completion_rpc_task(task);
 624         if (status != 0) {
 625                 data->cancelled = 1;
 626                 smp_wmb();
 627         } else
 628                 status = data->rpc_status;
 629         rpc_put_task(task);
 630         return status;
 631 }
 632
 633 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 634 {
 635         struct nfs4_opendata *data = calldata;
 636         struct nfs4_state_owner *sp = data->owner;
 637         struct rpc_message msg = {
 638                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 639                 .rpc_argp = &data->o_arg,
 640                 .rpc_resp = &data->o_res,
 641                 .rpc_cred = sp->so_cred,
 642         };
 643
 644         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 645                 return;
 646         /* Update sequence id. */
 647         data->o_arg.id = sp->so_id;
 648         data->o_arg.clientid = sp->so_client->cl_clientid;
 649         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 650                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 651         data->timestamp = jiffies;
 652         rpc_call_setup(task, &msg, 0);
 653 }
 654
 655 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 656 {
 657         struct nfs4_opendata *data = calldata;
 658
 659         data->rpc_status = task->tk_status;
 660         if (RPC_ASSASSINATED(task))
 661                 return;
 662         if (task->tk_status == 0) {
 663                 switch (data->o_res.f_attr->mode & S_IFMT) {
 664                         case S_IFREG:
 665                                 break;
 666                         case S_IFLNK:
 667                                 data->rpc_status = -ELOOP;
 668                                 break;
 669                         case S_IFDIR:
 670                                 data->rpc_status = -EISDIR;
 671                                 break;
 672                         default:
 673                                 data->rpc_status = -ENOTDIR;
 674                 }
 675                 renew_lease(data->o_res.server, data->timestamp);
 676         }
 677         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 678 }
 679
 680 static void nfs4_open_release(void *calldata)
 681 {
 682         struct nfs4_opendata *data = calldata;
 683         struct nfs4_state *state = NULL;
 684
 685         /* If this request hasn't been cancelled, do nothing */
 686         if (data->cancelled == 0)
 687                 goto out_free;
 688         /* In case of error, no cleanup! */
 689         if (data->rpc_status != 0)
 690                 goto out_free;
 691         /* In case we need an open_confirm, no cleanup! */
 692         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 693                 goto out_free;
 694         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 695         state = nfs4_opendata_to_nfs4_state(data);
 696         if (state != NULL)
 697                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 698 out_free:
 699         nfs4_opendata_free(data);
 700 }
 701
 702 static const struct rpc_call_ops nfs4_open_ops = {
 703         .rpc_call_prepare = nfs4_open_prepare,
 704         .rpc_call_done = nfs4_open_done,
 705         .rpc_release = nfs4_open_release,
 706 };
 707
 708 /*
 709  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 710  */
 711 static int _nfs4_proc_open(struct nfs4_opendata *data)
 712 {
 713         struct inode *dir = data->dir->d_inode;
 714         struct nfs_server *server = NFS_SERVER(dir);
 715         struct nfs_openargs *o_arg = &data->o_arg;
 716         struct nfs_openres *o_res = &data->o_res;
 717         struct rpc_task *task;
 718         int status;
 719
 720         atomic_inc(&data->count);
 721         /*
 722          * If rpc_run_task() ends up calling ->rpc_release(), we
 723          * want to ensure that it takes the 'error' code path.
 724          */
 725         data->rpc_status = -ENOMEM;
 726         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 727         if (IS_ERR(task))
 728                 return PTR_ERR(task);
 729         status = nfs4_wait_for_completion_rpc_task(task);
 730         if (status != 0) {
 731                 data->cancelled = 1;
 732                 smp_wmb();
 733         } else
 734                 status = data->rpc_status;
 735         rpc_put_task(task);
 736         if (status != 0)
 737                 return status;
 738
 739         if (o_arg->open_flags & O_CREAT) {
 740                 update_changeattr(dir, &o_res->cinfo);
 741                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 742         } else
 743                 nfs_refresh_inode(dir, o_res->dir_attr);
 744         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 745                 status = _nfs4_proc_open_confirm(data);
 746                 if (status != 0)
 747                         return status;
 748         }
 749         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 750         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 751                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 752         return 0;
 753 }
 754
 755 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 756 {
 757         struct nfs_access_entry cache;
 758         int mask = 0;
 759         int status;
 760
 761         if (openflags & FMODE_READ)
 762                 mask |= MAY_READ;
 763         if (openflags & FMODE_WRITE)
 764                 mask |= MAY_WRITE;
 765         status = nfs_access_get_cached(inode, cred, &cache);
 766         if (status == 0)
 767                 goto out;
 768
 769         /* Be clever: ask server to check for all possible rights */
 770         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 771         cache.cred = cred;
 772         cache.jiffies = jiffies;
 773         status = _nfs4_proc_access(inode, &cache);
 774         if (status != 0)
 775                 return status;
 776         nfs_access_add_cache(inode, &cache);
 777 out:
 778         if ((cache.mask & mask) == mask)
 779                 return 0;
 780         return -EACCES;
 781 }
 782
 783 static int nfs4_recover_expired_lease(struct nfs_server *server)
 784 {
 785         struct nfs_client *clp = server->nfs_client;
 786         int ret;
 787
 788         for (;;) {
 789                 ret = nfs4_wait_clnt_recover(server->client, clp);
 790                 if (ret != 0)
 791                         return ret;
 792                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 793                         break;
 794                 nfs4_schedule_state_recovery(clp);
 795         }
 796         return 0;
 797 }
 798
 799 /*
 800  * OPEN_EXPIRED:
 801  *      reclaim state on the server after a network partition.
 802  *      Assumes caller holds the appropriate lock
 803  */
 804 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 805 {
 806         struct inode *inode = state->inode;
 807         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 808         struct nfs4_opendata *opendata;
 809         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 810         int ret;
 811
 812         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 813                 ret = _nfs4_do_access(inode, ctx->cred, openflags);
 814                 if (ret < 0)
 815                         return ret;
 816                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 817                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 818                 return 0;
 819         }
 820         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, openflags, NULL);
 821         if (opendata == NULL)
 822                 return -ENOMEM;
 823         ret = nfs4_open_recover(opendata, state);
 824         if (ret == -ESTALE) {
 825                 /* Invalidate the state owner so we don't ever use it again */
 826                 nfs4_drop_state_owner(state->owner);
 827                 d_drop(ctx->path.dentry);
 828         }
 829         nfs4_opendata_free(opendata);
 830         return ret;
 831 }
 832
 833 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 834 {
 835         struct nfs_server *server = NFS_SERVER(state->inode);
 836         struct nfs4_exception exception = { };
 837         int err;
 838
 839         do {
 840                 err = _nfs4_open_expired(ctx, state);
 841                 if (err == -NFS4ERR_DELAY)
 842                         nfs4_handle_exception(server, err, &exception);
 843         } while (exception.retry);
 844         return err;
 845 }
 846
 847 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 848 {
 849         struct nfs_open_context *ctx;
 850         int ret;
 851
 852         ctx = nfs4_state_find_open_context(state);
 853         if (IS_ERR(ctx))
 854                 return PTR_ERR(ctx);
 855         ret = nfs4_do_open_expired(ctx, state);
 856         put_nfs_open_context(ctx);
 857         return ret;
 858 }
 859
 860 /*
 861  * Returns a referenced nfs4_state if there is an open delegation on the file
 862  */
 863 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 864 {
 865         struct nfs_delegation *delegation;
 866         struct nfs_server *server = NFS_SERVER(inode);
 867         struct nfs_client *clp = server->nfs_client;
 868         struct nfs_inode *nfsi = NFS_I(inode);
 869         struct nfs4_state_owner *sp = NULL;
 870         struct nfs4_state *state = NULL;
 871         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 872         int err;
 873
 874         err = -ENOMEM;
 875         if (!(sp = nfs4_get_state_owner(server, cred))) {
 876                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 877                 return err;
 878         }
 879         err = nfs4_recover_expired_lease(server);
 880         if (err != 0)
 881                 goto out_put_state_owner;
 882         /* Protect against reboot recovery - NOTE ORDER! */
 883         down_read(&clp->cl_sem);
 884         /* Protect against delegation recall */
 885         down_read(&nfsi->rwsem);
 886         delegation = NFS_I(inode)->delegation;
 887         err = -ENOENT;
 888         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 889                 goto out_err;
 890         err = -ENOMEM;
 891         state = nfs4_get_open_state(inode, sp);
 892         if (state == NULL)
 893                 goto out_err;
 894
 895         err = -ENOENT;
 896         if ((state->state & open_flags) == open_flags) {
 897                 spin_lock(&inode->i_lock);
 898                 update_open_stateflags(state, open_flags);
 899                 spin_unlock(&inode->i_lock);
 900                 goto out_ok;
 901         } else if (state->state != 0)
 902                 goto out_put_open_state;
 903
 904         lock_kernel();
 905         err = _nfs4_do_access(inode, cred, open_flags);
 906         unlock_kernel();
 907         if (err != 0)
 908                 goto out_put_open_state;
 909         set_bit(NFS_DELEGATED_STATE, &state->flags);
 910         update_open_stateid(state, &delegation->stateid, open_flags);
 911 out_ok:
 912         nfs4_put_state_owner(sp);
 913         up_read(&nfsi->rwsem);
 914         up_read(&clp->cl_sem);
 915         *res = state;
 916         return 0;
 917 out_put_open_state:
 918         nfs4_put_open_state(state);
 919 out_err:
 920         up_read(&nfsi->rwsem);
 921         up_read(&clp->cl_sem);
 922         if (err != -EACCES)
 923                 nfs_inode_return_delegation(inode);
 924 out_put_state_owner:
 925         nfs4_put_state_owner(sp);
 926         return err;
 927 }
 928
 929 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 930 {
 931         struct nfs4_exception exception = { };
 932         struct nfs4_state *res = ERR_PTR(-EIO);
 933         int err;
 934
 935         do {
 936                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 937                 if (err == 0)
 938                         break;
 939                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 940                                         err, &exception));
 941         } while (exception.retry);
 942         return res;
 943 }
 944
 945 /*
 946  * Returns a referenced nfs4_state
 947  */
 948 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 949 {
 950         struct nfs4_state_owner  *sp;
 951         struct nfs4_state     *state = NULL;
 952         struct nfs_server       *server = NFS_SERVER(dir);
 953         struct nfs_client *clp = server->nfs_client;
 954         struct nfs4_opendata *opendata;
 955         int                     status;
 956
 957         /* Protect against reboot recovery conflicts */
 958         status = -ENOMEM;
 959         if (!(sp = nfs4_get_state_owner(server, cred))) {
 960                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 961                 goto out_err;
 962         }
 963         status = nfs4_recover_expired_lease(server);
 964         if (status != 0)
 965                 goto err_put_state_owner;
 966         down_read(&clp->cl_sem);
 967         status = -ENOMEM;
 968         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
 969         if (opendata == NULL)
 970                 goto err_release_rwsem;
 971
 972         status = _nfs4_proc_open(opendata);
 973         if (status != 0)
 974                 goto err_opendata_free;
 975
 976         status = -ENOMEM;
 977         state = nfs4_opendata_to_nfs4_state(opendata);
 978         if (state == NULL)
 979                 goto err_opendata_free;
 980         if (opendata->o_res.delegation_type != 0)
 981                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 982         nfs4_opendata_free(opendata);
 983         nfs4_put_state_owner(sp);
 984         up_read(&clp->cl_sem);
 985         *res = state;
 986         return 0;
 987 err_opendata_free:
 988         nfs4_opendata_free(opendata);
 989 err_release_rwsem:
 990         up_read(&clp->cl_sem);
 991 err_put_state_owner:
 992         nfs4_put_state_owner(sp);
 993 out_err:
 994         *res = NULL;
 995         return status;
 996 }
 997
 998
 999 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1000 {
1001         struct nfs4_exception exception = { };
1002         struct nfs4_state *res;
1003         int status;
1004
1005         do {
1006                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1007                 if (status == 0)
1008                         break;
1009                 /* NOTE: BAD_SEQID means the server and client disagree about the
1010                  * book-keeping w.r.t. state-changing operations
1011                  * (OPEN/CLOSE/LOCK/LOCKU...)
1012                  * It is actually a sign of a bug on the client or on the server.
1013                  *
1014                  * If we receive a BAD_SEQID error in the particular case of
1015                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1016                  * have unhashed the old state_owner for us, and that we can
1017                  * therefore safely retry using a new one. We should still warn
1018                  * the user though...
1019                  */
1020                 if (status == -NFS4ERR_BAD_SEQID) {
1021                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1022                         exception.retry = 1;
1023                         continue;
1024                 }
1025                 /*
1026                  * BAD_STATEID on OPEN means that the server cancelled our
1027                  * state before it received the OPEN_CONFIRM.
1028                  * Recover by retrying the request as per the discussion
1029                  * on Page 181 of RFC3530.
1030                  */
1031                 if (status == -NFS4ERR_BAD_STATEID) {
1032                         exception.retry = 1;
1033                         continue;
1034                 }
1035                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1036                                         status, &exception));
1037         } while (exception.retry);
1038         return res;
1039 }
1040
1041 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1042                 struct iattr *sattr, struct nfs4_state *state)
1043 {
1044         struct nfs_server *server = NFS_SERVER(inode);
1045         struct nfs_setattrargs  arg = {
1046                 .fh             = NFS_FH(inode),
1047                 .iap            = sattr,
1048                 .server         = server,
1049                 .bitmask = server->attr_bitmask,
1050         };
1051         struct nfs_setattrres  res = {
1052                 .fattr          = fattr,
1053                 .server         = server,
1054         };
1055         struct rpc_message msg = {
1056                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1057                 .rpc_argp       = &arg,
1058                 .rpc_resp       = &res,
1059         };
1060         unsigned long timestamp = jiffies;
1061         int status;
1062
1063         nfs_fattr_init(fattr);
1064
1065         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1066                 /* Use that stateid */
1067         } else if (state != NULL) {
1068                 msg.rpc_cred = state->owner->so_cred;
1069                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1070         } else
1071                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1072
1073         status = rpc_call_sync(server->client, &msg, 0);
1074         if (status == 0 && state != NULL)
1075                 renew_lease(server, timestamp);
1076         return status;
1077 }
1078
1079 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1080                 struct iattr *sattr, struct nfs4_state *state)
1081 {
1082         struct nfs_server *server = NFS_SERVER(inode);
1083         struct nfs4_exception exception = { };
1084         int err;
1085         do {
1086                 err = nfs4_handle_exception(server,
1087                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1088                                 &exception);
1089         } while (exception.retry);
1090         return err;
1091 }
1092
1093 struct nfs4_closedata {
1094         struct path path;
1095         struct inode *inode;
1096         struct nfs4_state *state;
1097         struct nfs_closeargs arg;
1098         struct nfs_closeres res;
1099         struct nfs_fattr fattr;
1100         unsigned long timestamp;
1101 };
1102
1103 static void nfs4_free_closedata(void *data)
1104 {
1105         struct nfs4_closedata *calldata = data;
1106         struct nfs4_state_owner *sp = calldata->state->owner;
1107
1108         nfs4_put_open_state(calldata->state);
1109         nfs_free_seqid(calldata->arg.seqid);
1110         nfs4_put_state_owner(sp);
1111         dput(calldata->path.dentry);
1112         mntput(calldata->path.mnt);
1113         kfree(calldata);
1114 }
1115
1116 static void nfs4_close_done(struct rpc_task *task, void *data)
1117 {
1118         struct nfs4_closedata *calldata = data;
1119         struct nfs4_state *state = calldata->state;
1120         struct nfs_server *server = NFS_SERVER(calldata->inode);
1121
1122         if (RPC_ASSASSINATED(task))
1123                 return;
1124         /* hmm. we are done with the inode, and in the process of freeing
1125          * the state_owner. we keep this around to process errors
1126          */
1127         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1128         switch (task->tk_status) {
1129                 case 0:
1130                         memcpy(&state->stateid, &calldata->res.stateid,
1131                                         sizeof(state->stateid));
1132                         renew_lease(server, calldata->timestamp);
1133                         break;
1134                 case -NFS4ERR_STALE_STATEID:
1135                 case -NFS4ERR_EXPIRED:
1136                         break;
1137                 default:
1138                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1139                                 rpc_restart_call(task);
1140                                 return;
1141                         }
1142         }
1143         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1144 }
1145
1146 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1147 {
1148         struct nfs4_closedata *calldata = data;
1149         struct nfs4_state *state = calldata->state;
1150         struct rpc_message msg = {
1151                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1152                 .rpc_argp = &calldata->arg,
1153                 .rpc_resp = &calldata->res,
1154                 .rpc_cred = state->owner->so_cred,
1155         };
1156         int mode = 0, old_mode;
1157
1158         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1159                 return;
1160         /* Recalculate the new open mode in case someone reopened the file
1161          * while we were waiting in line to be scheduled.
1162          */
1163         spin_lock(&state->owner->so_lock);
1164         spin_lock(&calldata->inode->i_lock);
1165         mode = old_mode = state->state;
1166         if (state->n_rdwr == 0) {
1167                 if (state->n_rdonly == 0)
1168                         mode &= ~FMODE_READ;
1169                 if (state->n_wronly == 0)
1170                         mode &= ~FMODE_WRITE;
1171         }
1172         nfs4_state_set_mode_locked(state, mode);
1173         spin_unlock(&calldata->inode->i_lock);
1174         spin_unlock(&state->owner->so_lock);
1175         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1176                 /* Note: exit _without_ calling nfs4_close_done */
1177                 task->tk_action = NULL;
1178                 return;
1179         }
1180         nfs_fattr_init(calldata->res.fattr);
1181         if (mode != 0)
1182                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1183         calldata->arg.open_flags = mode;
1184         calldata->timestamp = jiffies;
1185         rpc_call_setup(task, &msg, 0);
1186 }
1187
1188 static const struct rpc_call_ops nfs4_close_ops = {
1189         .rpc_call_prepare = nfs4_close_prepare,
1190         .rpc_call_done = nfs4_close_done,
1191         .rpc_release = nfs4_free_closedata,
1192 };
1193
1194 /*
1195  * It is possible for data to be read/written from a mem-mapped file
1196  * after the sys_close call (which hits the vfs layer as a flush).
1197  * This means that we can't safely call nfsv4 close on a file until
1198  * the inode is cleared. This in turn means that we are not good
1199  * NFSv4 citizens - we do not indicate to the server to update the file's
1200  * share state even when we are done with one of the three share
1201  * stateid's in the inode.
1202  *
1203  * NOTE: Caller must be holding the sp->so_owner semaphore!
1204  */
1205 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1206 {
1207         struct nfs_server *server = NFS_SERVER(state->inode);
1208         struct nfs4_closedata *calldata;
1209         struct nfs4_state_owner *sp = state->owner;
1210         struct rpc_task *task;
1211         int status = -ENOMEM;
1212
1213         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1214         if (calldata == NULL)
1215                 goto out;
1216         calldata->inode = state->inode;
1217         calldata->state = state;
1218         calldata->arg.fh = NFS_FH(state->inode);
1219         calldata->arg.stateid = &state->stateid;
1220         /* Serialization for the sequence id */
1221         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1222         if (calldata->arg.seqid == NULL)
1223                 goto out_free_calldata;
1224         calldata->arg.bitmask = server->attr_bitmask;
1225         calldata->res.fattr = &calldata->fattr;
1226         calldata->res.server = server;
1227         calldata->path.mnt = mntget(path->mnt);
1228         calldata->path.dentry = dget(path->dentry);
1229
1230         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1231         if (IS_ERR(task))
1232                 return PTR_ERR(task);
1233         rpc_put_task(task);
1234         return 0;
1235 out_free_calldata:
1236         kfree(calldata);
1237 out:
1238         nfs4_put_open_state(state);
1239         nfs4_put_state_owner(sp);
1240         return status;
1241 }
1242
1243 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1244 {
1245         struct file *filp;
1246
1247         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1248         if (!IS_ERR(filp)) {
1249                 struct nfs_open_context *ctx;
1250                 ctx = (struct nfs_open_context *)filp->private_data;
1251                 ctx->state = state;
1252                 return 0;
1253         }
1254         nfs4_close_state(path, state, nd->intent.open.flags);
1255         return PTR_ERR(filp);
1256 }
1257
1258 struct dentry *
1259 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1260 {
1261         struct path path = {
1262                 .mnt = nd->mnt,
1263                 .dentry = dentry,
1264         };
1265         struct iattr attr;
1266         struct rpc_cred *cred;
1267         struct nfs4_state *state;
1268         struct dentry *res;
1269
1270         if (nd->flags & LOOKUP_CREATE) {
1271                 attr.ia_mode = nd->intent.open.create_mode;
1272                 attr.ia_valid = ATTR_MODE;
1273                 if (!IS_POSIXACL(dir))
1274                         attr.ia_mode &= ~current->fs->umask;
1275         } else {
1276                 attr.ia_valid = 0;
1277                 BUG_ON(nd->intent.open.flags & O_CREAT);
1278         }
1279
1280         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1281         if (IS_ERR(cred))
1282                 return (struct dentry *)cred;
1283         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1284         put_rpccred(cred);
1285         if (IS_ERR(state)) {
1286                 if (PTR_ERR(state) == -ENOENT)
1287                         d_add(dentry, NULL);
1288                 return (struct dentry *)state;
1289         }
1290         res = d_add_unique(dentry, igrab(state->inode));
1291         if (res != NULL)
1292                 dentry = res;
1293         nfs4_intent_set_file(nd, &path, state);
1294         return res;
1295 }
1296
1297 int
1298 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1299 {
1300         struct path path = {
1301                 .mnt = nd->mnt,
1302                 .dentry = dentry,
1303         };
1304         struct rpc_cred *cred;
1305         struct nfs4_state *state;
1306
1307         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1308         if (IS_ERR(cred))
1309                 return PTR_ERR(cred);
1310         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1311         if (IS_ERR(state))
1312                 state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1313         put_rpccred(cred);
1314         if (IS_ERR(state)) {
1315                 switch (PTR_ERR(state)) {
1316                         case -EPERM:
1317                         case -EACCES:
1318                         case -EDQUOT:
1319                         case -ENOSPC:
1320                         case -EROFS:
1321                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1322                                 return 1;
1323                         default:
1324                                 goto out_drop;
1325                 }
1326         }
1327         if (state->inode == dentry->d_inode) {
1328                 nfs4_intent_set_file(nd, &path, state);
1329                 return 1;
1330         }
1331         nfs4_close_state(&path, state, openflags);
1332 out_drop:
1333         d_drop(dentry);
1334         return 0;
1335 }
1336
1337
1338 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1339 {
1340         struct nfs4_server_caps_res res = {};
1341         struct rpc_message msg = {
1342                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1343                 .rpc_argp = fhandle,
1344                 .rpc_resp = &res,
1345         };
1346         int status;
1347
1348         status = rpc_call_sync(server->client, &msg, 0);
1349         if (status == 0) {
1350                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1351                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1352                         server->caps |= NFS_CAP_ACLS;
1353                 if (res.has_links != 0)
1354                         server->caps |= NFS_CAP_HARDLINKS;
1355                 if (res.has_symlinks != 0)
1356                         server->caps |= NFS_CAP_SYMLINKS;
1357                 server->acl_bitmask = res.acl_bitmask;
1358         }
1359         return status;
1360 }
1361
1362 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1363 {
1364         struct nfs4_exception exception = { };
1365         int err;
1366         do {
1367                 err = nfs4_handle_exception(server,
1368                                 _nfs4_server_capabilities(server, fhandle),
1369                                 &exception);
1370         } while (exception.retry);
1371         return err;
1372 }
1373
1374 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1375                 struct nfs_fsinfo *info)
1376 {
1377         struct nfs4_lookup_root_arg args = {
1378                 .bitmask = nfs4_fattr_bitmap,
1379         };
1380         struct nfs4_lookup_res res = {
1381                 .server = server,
1382                 .fattr = info->fattr,
1383                 .fh = fhandle,
1384         };
1385         struct rpc_message msg = {
1386                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1387                 .rpc_argp = &args,
1388                 .rpc_resp = &res,
1389         };
1390         nfs_fattr_init(info->fattr);
1391         return rpc_call_sync(server->client, &msg, 0);
1392 }
1393
1394 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1395                 struct nfs_fsinfo *info)
1396 {
1397         struct nfs4_exception exception = { };
1398         int err;
1399         do {
1400                 err = nfs4_handle_exception(server,
1401                                 _nfs4_lookup_root(server, fhandle, info),
1402                                 &exception);
1403         } while (exception.retry);
1404         return err;
1405 }
1406
1407 /*
1408  * get the file handle for the "/" directory on the server
1409  */
1410 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1411                               struct nfs_fsinfo *info)
1412 {
1413         int status;
1414
1415         status = nfs4_lookup_root(server, fhandle, info);
1416         if (status == 0)
1417                 status = nfs4_server_capabilities(server, fhandle);
1418         if (status == 0)
1419                 status = nfs4_do_fsinfo(server, fhandle, info);
1420         return nfs4_map_errors(status);
1421 }
1422
1423 /*
1424  * Get locations and (maybe) other attributes of a referral.
1425  * Note that we'll actually follow the referral later when
1426  * we detect fsid mismatch in inode revalidation
1427  */
1428 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1429 {
1430         int status = -ENOMEM;
1431         struct page *page = NULL;
1432         struct nfs4_fs_locations *locations = NULL;
1433
1434         page = alloc_page(GFP_KERNEL);
1435         if (page == NULL)
1436                 goto out;
1437         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1438         if (locations == NULL)
1439                 goto out;
1440
1441         status = nfs4_proc_fs_locations(dir, name, locations, page);
1442         if (status != 0)
1443                 goto out;
1444         /* Make sure server returned a different fsid for the referral */
1445         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1446                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1447                 status = -EIO;
1448                 goto out;
1449         }
1450
1451         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1452         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1453         if (!fattr->mode)
1454                 fattr->mode = S_IFDIR;
1455         memset(fhandle, 0, sizeof(struct nfs_fh));
1456 out:
1457         if (page)
1458                 __free_page(page);
1459         if (locations)
1460                 kfree(locations);
1461         return status;
1462 }
1463
1464 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1465 {
1466         struct nfs4_getattr_arg args = {
1467                 .fh = fhandle,
1468                 .bitmask = server->attr_bitmask,
1469         };
1470         struct nfs4_getattr_res res = {
1471                 .fattr = fattr,
1472                 .server = server,
1473         };
1474         struct rpc_message msg = {
1475                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1476                 .rpc_argp = &args,
1477                 .rpc_resp = &res,
1478         };
1479
1480         nfs_fattr_init(fattr);
1481         return rpc_call_sync(server->client, &msg, 0);
1482 }
1483
1484 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1485 {
1486         struct nfs4_exception exception = { };
1487         int err;
1488         do {
1489                 err = nfs4_handle_exception(server,
1490                                 _nfs4_proc_getattr(server, fhandle, fattr),
1491                                 &exception);
1492         } while (exception.retry);
1493         return err;
1494 }
1495
1496 /*
1497  * The file is not closed if it is opened due to the a request to change
1498  * the size of the file. The open call will not be needed once the
1499  * VFS layer lookup-intents are implemented.
1500  *
1501  * Close is called when the inode is destroyed.
1502  * If we haven't opened the file for O_WRONLY, we
1503  * need to in the size_change case to obtain a stateid.
1504  *
1505  * Got race?
1506  * Because OPEN is always done by name in nfsv4, it is
1507  * possible that we opened a different file by the same
1508  * name.  We can recognize this race condition, but we
1509  * can't do anything about it besides returning an error.
1510  *
1511  * This will be fixed with VFS changes (lookup-intent).
1512  */
1513 static int
1514 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1515                   struct iattr *sattr)
1516 {
1517         struct rpc_cred *cred;
1518         struct inode *inode = dentry->d_inode;
1519         struct nfs_open_context *ctx;
1520         struct nfs4_state *state = NULL;
1521         int status;
1522
1523         nfs_fattr_init(fattr);
1524
1525         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1526         if (IS_ERR(cred))
1527                 return PTR_ERR(cred);
1528
1529         /* Search for an existing open(O_WRITE) file */
1530         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1531         if (ctx != NULL)
1532                 state = ctx->state;
1533
1534         status = nfs4_do_setattr(inode, fattr, sattr, state);
1535         if (status == 0)
1536                 nfs_setattr_update_inode(inode, sattr);
1537         if (ctx != NULL)
1538                 put_nfs_open_context(ctx);
1539         put_rpccred(cred);
1540         return status;
1541 }
1542
1543 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1544                 struct qstr *name, struct nfs_fh *fhandle,
1545                 struct nfs_fattr *fattr)
1546 {
1547         int                    status;
1548         struct nfs4_lookup_arg args = {
1549                 .bitmask = server->attr_bitmask,
1550                 .dir_fh = dirfh,
1551                 .name = name,
1552         };
1553         struct nfs4_lookup_res res = {
1554                 .server = server,
1555                 .fattr = fattr,
1556                 .fh = fhandle,
1557         };
1558         struct rpc_message msg = {
1559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1560                 .rpc_argp = &args,
1561                 .rpc_resp = &res,
1562         };
1563
1564         nfs_fattr_init(fattr);
1565
1566         dprintk("NFS call  lookupfh %s\n", name->name);
1567         status = rpc_call_sync(server->client, &msg, 0);
1568         dprintk("NFS reply lookupfh: %d\n", status);
1569         if (status == -NFS4ERR_MOVED)
1570                 status = -EREMOTE;
1571         return status;
1572 }
1573
1574 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1575                               struct qstr *name, struct nfs_fh *fhandle,
1576                               struct nfs_fattr *fattr)
1577 {
1578         struct nfs4_exception exception = { };
1579         int err;
1580         do {
1581                 err = nfs4_handle_exception(server,
1582                                 _nfs4_proc_lookupfh(server, dirfh, name,
1583                                                     fhandle, fattr),
1584                                 &exception);
1585         } while (exception.retry);
1586         return err;
1587 }
1588
1589 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1590                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1591 {
1592         int                    status;
1593         struct nfs_server *server = NFS_SERVER(dir);
1594         struct nfs4_lookup_arg args = {
1595                 .bitmask = server->attr_bitmask,
1596                 .dir_fh = NFS_FH(dir),
1597                 .name = name,
1598         };
1599         struct nfs4_lookup_res res = {
1600                 .server = server,
1601                 .fattr = fattr,
1602                 .fh = fhandle,
1603         };
1604         struct rpc_message msg = {
1605                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1606                 .rpc_argp = &args,
1607                 .rpc_resp = &res,
1608         };
1609
1610         nfs_fattr_init(fattr);
1611
1612         dprintk("NFS call  lookup %s\n", name->name);
1613         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1614         if (status == -NFS4ERR_MOVED)
1615                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1616         dprintk("NFS reply lookup: %d\n", status);
1617         return status;
1618 }
1619
1620 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1621 {
1622         struct nfs4_exception exception = { };
1623         int err;
1624         do {
1625                 err = nfs4_handle_exception(NFS_SERVER(dir),
1626                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1627                                 &exception);
1628         } while (exception.retry);
1629         return err;
1630 }
1631
1632 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1633 {
1634         struct nfs4_accessargs args = {
1635                 .fh = NFS_FH(inode),
1636         };
1637         struct nfs4_accessres res = { 0 };
1638         struct rpc_message msg = {
1639                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1640                 .rpc_argp = &args,
1641                 .rpc_resp = &res,
1642                 .rpc_cred = entry->cred,
1643         };
1644         int mode = entry->mask;
1645         int status;
1646
1647         /*
1648          * Determine which access bits we want to ask for...
1649          */
1650         if (mode & MAY_READ)
1651                 args.access |= NFS4_ACCESS_READ;
1652         if (S_ISDIR(inode->i_mode)) {
1653                 if (mode & MAY_WRITE)
1654                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1655                 if (mode & MAY_EXEC)
1656                         args.access |= NFS4_ACCESS_LOOKUP;
1657         } else {
1658                 if (mode & MAY_WRITE)
1659                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1660                 if (mode & MAY_EXEC)
1661                         args.access |= NFS4_ACCESS_EXECUTE;
1662         }
1663         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1664         if (!status) {
1665                 entry->mask = 0;
1666                 if (res.access & NFS4_ACCESS_READ)
1667                         entry->mask |= MAY_READ;
1668                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1669                         entry->mask |= MAY_WRITE;
1670                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1671                         entry->mask |= MAY_EXEC;
1672         }
1673         return status;
1674 }
1675
1676 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1677 {
1678         struct nfs4_exception exception = { };
1679         int err;
1680         do {
1681                 err = nfs4_handle_exception(NFS_SERVER(inode),
1682                                 _nfs4_proc_access(inode, entry),
1683                                 &exception);
1684         } while (exception.retry);
1685         return err;
1686 }
1687
1688 /*
1689  * TODO: For the time being, we don't try to get any attributes
1690  * along with any of the zero-copy operations READ, READDIR,
1691  * READLINK, WRITE.
1692  *
1693  * In the case of the first three, we want to put the GETATTR
1694  * after the read-type operation -- this is because it is hard
1695  * to predict the length of a GETATTR response in v4, and thus
1696  * align the READ data correctly.  This means that the GETATTR
1697  * may end up partially falling into the page cache, and we should
1698  * shift it into the 'tail' of the xdr_buf before processing.
1699  * To do this efficiently, we need to know the total length
1700  * of data received, which doesn't seem to be available outside
1701  * of the RPC layer.
1702  *
1703  * In the case of WRITE, we also want to put the GETATTR after
1704  * the operation -- in this case because we want to make sure
1705  * we get the post-operation mtime and size.  This means that
1706  * we can't use xdr_encode_pages() as written: we need a variant
1707  * of it which would leave room in the 'tail' iovec.
1708  *
1709  * Both of these changes to the XDR layer would in fact be quite
1710  * minor, but I decided to leave them for a subsequent patch.
1711  */
1712 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1713                 unsigned int pgbase, unsigned int pglen)
1714 {
1715         struct nfs4_readlink args = {
1716                 .fh       = NFS_FH(inode),
1717                 .pgbase   = pgbase,
1718                 .pglen    = pglen,
1719                 .pages    = &page,
1720         };
1721         struct rpc_message msg = {
1722                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1723                 .rpc_argp = &args,
1724                 .rpc_resp = NULL,
1725         };
1726
1727         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1728 }
1729
1730 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1731                 unsigned int pgbase, unsigned int pglen)
1732 {
1733         struct nfs4_exception exception = { };
1734         int err;
1735         do {
1736                 err = nfs4_handle_exception(NFS_SERVER(inode),
1737                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1738                                 &exception);
1739         } while (exception.retry);
1740         return err;
1741 }
1742
1743 /*
1744  * Got race?
1745  * We will need to arrange for the VFS layer to provide an atomic open.
1746  * Until then, this create/open method is prone to inefficiency and race
1747  * conditions due to the lookup, create, and open VFS calls from sys_open()
1748  * placed on the wire.
1749  *
1750  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1751  * The file will be opened again in the subsequent VFS open call
1752  * (nfs4_proc_file_open).
1753  *
1754  * The open for read will just hang around to be used by any process that
1755  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1756  */
1757
1758 static int
1759 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1760                  int flags, struct nameidata *nd)
1761 {
1762         struct path path = {
1763                 .mnt = nd->mnt,
1764                 .dentry = dentry,
1765         };
1766         struct nfs4_state *state;
1767         struct rpc_cred *cred;
1768         int status = 0;
1769
1770         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1771         if (IS_ERR(cred)) {
1772                 status = PTR_ERR(cred);
1773                 goto out;
1774         }
1775         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1776         put_rpccred(cred);
1777         if (IS_ERR(state)) {
1778                 status = PTR_ERR(state);
1779                 goto out;
1780         }
1781         d_instantiate(dentry, igrab(state->inode));
1782         if (flags & O_EXCL) {
1783                 struct nfs_fattr fattr;
1784                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1785                 if (status == 0)
1786                         nfs_setattr_update_inode(state->inode, sattr);
1787         }
1788         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1789                 status = nfs4_intent_set_file(nd, &path, state);
1790         else
1791                 nfs4_close_state(&path, state, flags);
1792 out:
1793         return status;
1794 }
1795
1796 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1797 {
1798         struct nfs_server *server = NFS_SERVER(dir);
1799         struct nfs4_remove_arg args = {
1800                 .fh = NFS_FH(dir),
1801                 .name = name,
1802                 .bitmask = server->attr_bitmask,
1803         };
1804         struct nfs_fattr dir_attr;
1805         struct nfs4_remove_res  res = {
1806                 .server = server,
1807                 .dir_attr = &dir_attr,
1808         };
1809         struct rpc_message msg = {
1810                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1811                 .rpc_argp       = &args,
1812                 .rpc_resp       = &res,
1813         };
1814         int                     status;
1815
1816         nfs_fattr_init(res.dir_attr);
1817         status = rpc_call_sync(server->client, &msg, 0);
1818         if (status == 0) {
1819                 update_changeattr(dir, &res.cinfo);
1820                 nfs_post_op_update_inode(dir, res.dir_attr);
1821         }
1822         return status;
1823 }
1824
1825 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1826 {
1827         struct nfs4_exception exception = { };
1828         int err;
1829         do {
1830                 err = nfs4_handle_exception(NFS_SERVER(dir),
1831                                 _nfs4_proc_remove(dir, name),
1832                                 &exception);
1833         } while (exception.retry);
1834         return err;
1835 }
1836
1837 struct unlink_desc {
1838         struct nfs4_remove_arg  args;
1839         struct nfs4_remove_res  res;
1840         struct nfs_fattr dir_attr;
1841 };
1842
1843 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1844                 struct qstr *name)
1845 {
1846         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1847         struct unlink_desc *up;
1848
1849         up = kmalloc(sizeof(*up), GFP_KERNEL);
1850         if (!up)
1851                 return -ENOMEM;
1852
1853         up->args.fh = NFS_FH(dir->d_inode);
1854         up->args.name = name;
1855         up->args.bitmask = server->attr_bitmask;
1856         up->res.server = server;
1857         up->res.dir_attr = &up->dir_attr;
1858
1859         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1860         msg->rpc_argp = &up->args;
1861         msg->rpc_resp = &up->res;
1862         return 0;
1863 }
1864
1865 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1866 {
1867         struct rpc_message *msg = &task->tk_msg;
1868         struct unlink_desc *up;
1869
1870         if (msg->rpc_resp != NULL) {
1871                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1872                 update_changeattr(dir->d_inode, &up->res.cinfo);
1873                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1874                 kfree(up);
1875                 msg->rpc_resp = NULL;
1876                 msg->rpc_argp = NULL;
1877         }
1878         return 0;
1879 }
1880
1881 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1882                 struct inode *new_dir, struct qstr *new_name)
1883 {
1884         struct nfs_server *server = NFS_SERVER(old_dir);
1885         struct nfs4_rename_arg arg = {
1886                 .old_dir = NFS_FH(old_dir),
1887                 .new_dir = NFS_FH(new_dir),
1888                 .old_name = old_name,
1889                 .new_name = new_name,
1890                 .bitmask = server->attr_bitmask,
1891         };
1892         struct nfs_fattr old_fattr, new_fattr;
1893         struct nfs4_rename_res res = {
1894                 .server = server,
1895                 .old_fattr = &old_fattr,
1896                 .new_fattr = &new_fattr,
1897         };
1898         struct rpc_message msg = {
1899                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1900                 .rpc_argp = &arg,
1901                 .rpc_resp = &res,
1902         };
1903         int                     status;
1904
1905         nfs_fattr_init(res.old_fattr);
1906         nfs_fattr_init(res.new_fattr);
1907         status = rpc_call_sync(server->client, &msg, 0);
1908
1909         if (!status) {
1910                 update_changeattr(old_dir, &res.old_cinfo);
1911                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1912                 update_changeattr(new_dir, &res.new_cinfo);
1913                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1914         }
1915         return status;
1916 }
1917
1918 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1919                 struct inode *new_dir, struct qstr *new_name)
1920 {
1921         struct nfs4_exception exception = { };
1922         int err;
1923         do {
1924                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1925                                 _nfs4_proc_rename(old_dir, old_name,
1926                                         new_dir, new_name),
1927                                 &exception);
1928         } while (exception.retry);
1929         return err;
1930 }
1931
1932 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1933 {
1934         struct nfs_server *server = NFS_SERVER(inode);
1935         struct nfs4_link_arg arg = {
1936                 .fh     = NFS_FH(inode),
1937                 .dir_fh = NFS_FH(dir),
1938                 .name   = name,
1939                 .bitmask = server->attr_bitmask,
1940         };
1941         struct nfs_fattr fattr, dir_attr;
1942         struct nfs4_link_res res = {
1943                 .server = server,
1944                 .fattr = &fattr,
1945                 .dir_attr = &dir_attr,
1946         };
1947         struct rpc_message msg = {
1948                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1949                 .rpc_argp = &arg,
1950                 .rpc_resp = &res,
1951         };
1952         int                     status;
1953
1954         nfs_fattr_init(res.fattr);
1955         nfs_fattr_init(res.dir_attr);
1956         status = rpc_call_sync(server->client, &msg, 0);
1957         if (!status) {
1958                 update_changeattr(dir, &res.cinfo);
1959                 nfs_post_op_update_inode(dir, res.dir_attr);
1960                 nfs_post_op_update_inode(inode, res.fattr);
1961         }
1962
1963         return status;
1964 }
1965
1966 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1967 {
1968         struct nfs4_exception exception = { };
1969         int err;
1970         do {
1971                 err = nfs4_handle_exception(NFS_SERVER(inode),
1972                                 _nfs4_proc_link(inode, dir, name),
1973                                 &exception);
1974         } while (exception.retry);
1975         return err;
1976 }
1977
1978 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
1979                 struct page *page, unsigned int len, struct iattr *sattr)
1980 {
1981         struct nfs_server *server = NFS_SERVER(dir);
1982         struct nfs_fh fhandle;
1983         struct nfs_fattr fattr, dir_fattr;
1984         struct nfs4_create_arg arg = {
1985                 .dir_fh = NFS_FH(dir),
1986                 .server = server,
1987                 .name = &dentry->d_name,
1988                 .attrs = sattr,
1989                 .ftype = NF4LNK,
1990                 .bitmask = server->attr_bitmask,
1991         };
1992         struct nfs4_create_res res = {
1993                 .server = server,
1994                 .fh = &fhandle,
1995                 .fattr = &fattr,
1996                 .dir_fattr = &dir_fattr,
1997         };
1998         struct rpc_message msg = {
1999                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2000                 .rpc_argp = &arg,
2001                 .rpc_resp = &res,
2002         };
2003         int                     status;
2004
2005         if (len > NFS4_MAXPATHLEN)
2006                 return -ENAMETOOLONG;
2007
2008         arg.u.symlink.pages = &page;
2009         arg.u.symlink.len = len;
2010         nfs_fattr_init(&fattr);
2011         nfs_fattr_init(&dir_fattr);
2012
2013         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2014         if (!status) {
2015                 update_changeattr(dir, &res.dir_cinfo);
2016                 nfs_post_op_update_inode(dir, res.dir_fattr);
2017                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2018         }
2019         return status;
2020 }
2021
2022 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2023                 struct page *page, unsigned int len, struct iattr *sattr)
2024 {
2025         struct nfs4_exception exception = { };
2026         int err;
2027         do {
2028                 err = nfs4_handle_exception(NFS_SERVER(dir),
2029                                 _nfs4_proc_symlink(dir, dentry, page,
2030                                                         len, sattr),
2031                                 &exception);
2032         } while (exception.retry);
2033         return err;
2034 }
2035
2036 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2037                 struct iattr *sattr)
2038 {
2039         struct nfs_server *server = NFS_SERVER(dir);
2040         struct nfs_fh fhandle;
2041         struct nfs_fattr fattr, dir_fattr;
2042         struct nfs4_create_arg arg = {
2043                 .dir_fh = NFS_FH(dir),
2044                 .server = server,
2045                 .name = &dentry->d_name,
2046                 .attrs = sattr,
2047                 .ftype = NF4DIR,
2048                 .bitmask = server->attr_bitmask,
2049         };
2050         struct nfs4_create_res res = {
2051                 .server = server,
2052                 .fh = &fhandle,
2053                 .fattr = &fattr,
2054                 .dir_fattr = &dir_fattr,
2055         };
2056         struct rpc_message msg = {
2057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2058                 .rpc_argp = &arg,
2059                 .rpc_resp = &res,
2060         };
2061         int                     status;
2062
2063         nfs_fattr_init(&fattr);
2064         nfs_fattr_init(&dir_fattr);
2065
2066         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2067         if (!status) {
2068                 update_changeattr(dir, &res.dir_cinfo);
2069                 nfs_post_op_update_inode(dir, res.dir_fattr);
2070                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2071         }
2072         return status;
2073 }
2074
2075 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2076                 struct iattr *sattr)
2077 {
2078         struct nfs4_exception exception = { };
2079         int err;
2080         do {
2081                 err = nfs4_handle_exception(NFS_SERVER(dir),
2082                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2083                                 &exception);
2084         } while (exception.retry);
2085         return err;
2086 }
2087
2088 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2089                   u64 cookie, struct page *page, unsigned int count, int plus)
2090 {
2091         struct inode            *dir = dentry->d_inode;
2092         struct nfs4_readdir_arg args = {
2093                 .fh = NFS_FH(dir),
2094                 .pages = &page,
2095                 .pgbase = 0,
2096                 .count = count,
2097                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2098         };
2099         struct nfs4_readdir_res res;
2100         struct rpc_message msg = {
2101                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2102                 .rpc_argp = &args,
2103                 .rpc_resp = &res,
2104                 .rpc_cred = cred,
2105         };
2106         int                     status;
2107
2108         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2109                         dentry->d_parent->d_name.name,
2110                         dentry->d_name.name,
2111                         (unsigned long long)cookie);
2112         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2113         res.pgbase = args.pgbase;
2114         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2115         if (status == 0)
2116                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2117         dprintk("%s: returns %d\n", __FUNCTION__, status);
2118         return status;
2119 }
2120
2121 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2122                   u64 cookie, struct page *page, unsigned int count, int plus)
2123 {
2124         struct nfs4_exception exception = { };
2125         int err;
2126         do {
2127                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2128                                 _nfs4_proc_readdir(dentry, cred, cookie,
2129                                         page, count, plus),
2130                                 &exception);
2131         } while (exception.retry);
2132         return err;
2133 }
2134
2135 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2136                 struct iattr *sattr, dev_t rdev)
2137 {
2138         struct nfs_server *server = NFS_SERVER(dir);
2139         struct nfs_fh fh;
2140         struct nfs_fattr fattr, dir_fattr;
2141         struct nfs4_create_arg arg = {
2142                 .dir_fh = NFS_FH(dir),
2143                 .server = server,
2144                 .name = &dentry->d_name,
2145                 .attrs = sattr,
2146                 .bitmask = server->attr_bitmask,
2147         };
2148         struct nfs4_create_res res = {
2149                 .server = server,
2150                 .fh = &fh,
2151                 .fattr = &fattr,
2152                 .dir_fattr = &dir_fattr,
2153         };
2154         struct rpc_message msg = {
2155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2156                 .rpc_argp = &arg,
2157                 .rpc_resp = &res,
2158         };
2159         int                     status;
2160         int                     mode = sattr->ia_mode;
2161
2162         nfs_fattr_init(&fattr);
2163         nfs_fattr_init(&dir_fattr);
2164
2165         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2166         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2167         if (S_ISFIFO(mode))
2168                 arg.ftype = NF4FIFO;
2169         else if (S_ISBLK(mode)) {
2170                 arg.ftype = NF4BLK;
2171                 arg.u.device.specdata1 = MAJOR(rdev);
2172                 arg.u.device.specdata2 = MINOR(rdev);
2173         }
2174         else if (S_ISCHR(mode)) {
2175                 arg.ftype = NF4CHR;
2176                 arg.u.device.specdata1 = MAJOR(rdev);
2177                 arg.u.device.specdata2 = MINOR(rdev);
2178         }
2179         else
2180                 arg.ftype = NF4SOCK;
2181
2182         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2183         if (status == 0) {
2184                 update_changeattr(dir, &res.dir_cinfo);
2185                 nfs_post_op_update_inode(dir, res.dir_fattr);
2186                 status = nfs_instantiate(dentry, &fh, &fattr);
2187         }
2188         return status;
2189 }
2190
2191 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2192                 struct iattr *sattr, dev_t rdev)
2193 {
2194         struct nfs4_exception exception = { };
2195         int err;
2196         do {
2197                 err = nfs4_handle_exception(NFS_SERVER(dir),
2198                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2199                                 &exception);
2200         } while (exception.retry);
2201         return err;
2202 }
2203
2204 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2205                  struct nfs_fsstat *fsstat)
2206 {
2207         struct nfs4_statfs_arg args = {
2208                 .fh = fhandle,
2209                 .bitmask = server->attr_bitmask,
2210         };
2211         struct rpc_message msg = {
2212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2213                 .rpc_argp = &args,
2214                 .rpc_resp = fsstat,
2215         };
2216
2217         nfs_fattr_init(fsstat->fattr);
2218         return rpc_call_sync(server->client, &msg, 0);
2219 }
2220
2221 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2222 {
2223         struct nfs4_exception exception = { };
2224         int err;
2225         do {
2226                 err = nfs4_handle_exception(server,
2227                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2228                                 &exception);
2229         } while (exception.retry);
2230         return err;
2231 }
2232
2233 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2234                 struct nfs_fsinfo *fsinfo)
2235 {
2236         struct nfs4_fsinfo_arg args = {
2237                 .fh = fhandle,
2238                 .bitmask = server->attr_bitmask,
2239         };
2240         struct rpc_message msg = {
2241                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2242                 .rpc_argp = &args,
2243                 .rpc_resp = fsinfo,
2244         };
2245
2246         return rpc_call_sync(server->client, &msg, 0);
2247 }
2248
2249 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2250 {
2251         struct nfs4_exception exception = { };
2252         int err;
2253
2254         do {
2255                 err = nfs4_handle_exception(server,
2256                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2257                                 &exception);
2258         } while (exception.retry);
2259         return err;
2260 }
2261
2262 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2263 {
2264         nfs_fattr_init(fsinfo->fattr);
2265         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2266 }
2267
2268 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2269                 struct nfs_pathconf *pathconf)
2270 {
2271         struct nfs4_pathconf_arg args = {
2272                 .fh = fhandle,
2273                 .bitmask = server->attr_bitmask,
2274         };
2275         struct rpc_message msg = {
2276                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2277                 .rpc_argp = &args,
2278                 .rpc_resp = pathconf,
2279         };
2280
2281         /* None of the pathconf attributes are mandatory to implement */
2282         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2283                 memset(pathconf, 0, sizeof(*pathconf));
2284                 return 0;
2285         }
2286
2287         nfs_fattr_init(pathconf->fattr);
2288         return rpc_call_sync(server->client, &msg, 0);
2289 }
2290
2291 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2292                 struct nfs_pathconf *pathconf)
2293 {
2294         struct nfs4_exception exception = { };
2295         int err;
2296
2297         do {
2298                 err = nfs4_handle_exception(server,
2299                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2300                                 &exception);
2301         } while (exception.retry);
2302         return err;
2303 }
2304
2305 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2306 {
2307         struct nfs_server *server = NFS_SERVER(data->inode);
2308
2309         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2310                 rpc_restart_call(task);
2311                 return -EAGAIN;
2312         }
2313         if (task->tk_status > 0)
2314                 renew_lease(server, data->timestamp);
2315         return 0;
2316 }
2317
2318 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2319 {
2320         struct rpc_message msg = {
2321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2322                 .rpc_argp = &data->args,
2323                 .rpc_resp = &data->res,
2324                 .rpc_cred = data->cred,
2325         };
2326
2327         data->timestamp   = jiffies;
2328
2329         rpc_call_setup(&data->task, &msg, 0);
2330 }
2331
2332 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2333 {
2334         struct inode *inode = data->inode;
2335
2336         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2337                 rpc_restart_call(task);
2338                 return -EAGAIN;
2339         }
2340         if (task->tk_status >= 0) {
2341                 renew_lease(NFS_SERVER(inode), data->timestamp);
2342                 nfs_post_op_update_inode(inode, data->res.fattr);
2343         }
2344         return 0;
2345 }
2346
2347 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2348 {
2349         struct rpc_message msg = {
2350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2351                 .rpc_argp = &data->args,
2352                 .rpc_resp = &data->res,
2353                 .rpc_cred = data->cred,
2354         };
2355         struct inode *inode = data->inode;
2356         struct nfs_server *server = NFS_SERVER(inode);
2357         int stable;
2358
2359         if (how & FLUSH_STABLE) {
2360                 if (!NFS_I(inode)->ncommit)
2361                         stable = NFS_FILE_SYNC;
2362                 else
2363                         stable = NFS_DATA_SYNC;
2364         } else
2365                 stable = NFS_UNSTABLE;
2366         data->args.stable = stable;
2367         data->args.bitmask = server->attr_bitmask;
2368         data->res.server = server;
2369
2370         data->timestamp   = jiffies;
2371
2372         /* Finalize the task. */
2373         rpc_call_setup(&data->task, &msg, 0);
2374 }
2375
2376 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2377 {
2378         struct inode *inode = data->inode;
2379
2380         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2381                 rpc_restart_call(task);
2382                 return -EAGAIN;
2383         }
2384         if (task->tk_status >= 0)
2385                 nfs_post_op_update_inode(inode, data->res.fattr);
2386         return 0;
2387 }
2388
2389 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2390 {
2391         struct rpc_message msg = {
2392                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2393                 .rpc_argp = &data->args,
2394                 .rpc_resp = &data->res,
2395                 .rpc_cred = data->cred,
2396         };
2397         struct nfs_server *server = NFS_SERVER(data->inode);
2398
2399         data->args.bitmask = server->attr_bitmask;
2400         data->res.server = server;
2401
2402         rpc_call_setup(&data->task, &msg, 0);
2403 }
2404
2405 /*
2406  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2407  * standalone procedure for queueing an asynchronous RENEW.
2408  */
2409 static void nfs4_renew_done(struct rpc_task *task, void *data)
2410 {
2411         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2412         unsigned long timestamp = (unsigned long)data;
2413
2414         if (task->tk_status < 0) {
2415                 switch (task->tk_status) {
2416                         case -NFS4ERR_STALE_CLIENTID:
2417                         case -NFS4ERR_EXPIRED:
2418                         case -NFS4ERR_CB_PATH_DOWN:
2419                                 nfs4_schedule_state_recovery(clp);
2420                 }
2421                 return;
2422         }
2423         spin_lock(&clp->cl_lock);
2424         if (time_before(clp->cl_last_renewal,timestamp))
2425                 clp->cl_last_renewal = timestamp;
2426         spin_unlock(&clp->cl_lock);
2427 }
2428
2429 static const struct rpc_call_ops nfs4_renew_ops = {
2430         .rpc_call_done = nfs4_renew_done,
2431 };
2432
2433 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2434 {
2435         struct rpc_message msg = {
2436                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2437                 .rpc_argp       = clp,
2438                 .rpc_cred       = cred,
2439         };
2440
2441         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2442                         &nfs4_renew_ops, (void *)jiffies);
2443 }
2444
2445 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2446 {
2447         struct rpc_message msg = {
2448                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2449                 .rpc_argp       = clp,
2450                 .rpc_cred       = cred,
2451         };
2452         unsigned long now = jiffies;
2453         int status;
2454
2455         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2456         if (status < 0)
2457                 return status;
2458         spin_lock(&clp->cl_lock);
2459         if (time_before(clp->cl_last_renewal,now))
2460                 clp->cl_last_renewal = now;
2461         spin_unlock(&clp->cl_lock);
2462         return 0;
2463 }
2464
2465 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2466 {
2467         return (server->caps & NFS_CAP_ACLS)
2468                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2469                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2470 }
2471
2472 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2473  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2474  * the stack.
2475  */
2476 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2477
2478 static void buf_to_pages(const void *buf, size_t buflen,
2479                 struct page **pages, unsigned int *pgbase)
2480 {
2481         const void *p = buf;
2482
2483         *pgbase = offset_in_page(buf);
2484         p -= *pgbase;
2485         while (p < buf + buflen) {
2486                 *(pages++) = virt_to_page(p);
2487                 p += PAGE_CACHE_SIZE;
2488         }
2489 }
2490
2491 struct nfs4_cached_acl {
2492         int cached;
2493         size_t len;
2494         char data[0];
2495 };
2496
2497 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2498 {
2499         struct nfs_inode *nfsi = NFS_I(inode);
2500
2501         spin_lock(&inode->i_lock);
2502         kfree(nfsi->nfs4_acl);
2503         nfsi->nfs4_acl = acl;
2504         spin_unlock(&inode->i_lock);
2505 }
2506
2507 static void nfs4_zap_acl_attr(struct inode *inode)
2508 {
2509         nfs4_set_cached_acl(inode, NULL);
2510 }
2511
2512 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2513 {
2514         struct nfs_inode *nfsi = NFS_I(inode);
2515         struct nfs4_cached_acl *acl;
2516         int ret = -ENOENT;
2517
2518         spin_lock(&inode->i_lock);
2519         acl = nfsi->nfs4_acl;
2520         if (acl == NULL)
2521                 goto out;
2522         if (buf == NULL) /* user is just asking for length */
2523                 goto out_len;
2524         if (acl->cached == 0)
2525                 goto out;
2526         ret = -ERANGE; /* see getxattr(2) man page */
2527         if (acl->len > buflen)
2528                 goto out;
2529         memcpy(buf, acl->data, acl->len);
2530 out_len:
2531         ret = acl->len;
2532 out:
2533         spin_unlock(&inode->i_lock);
2534         return ret;
2535 }
2536
2537 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2538 {
2539         struct nfs4_cached_acl *acl;
2540
2541         if (buf && acl_len <= PAGE_SIZE) {
2542                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2543                 if (acl == NULL)
2544                         goto out;
2545                 acl->cached = 1;
2546                 memcpy(acl->data, buf, acl_len);
2547         } else {
2548                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2549                 if (acl == NULL)
2550                         goto out;
2551                 acl->cached = 0;
2552         }
2553         acl->len = acl_len;
2554 out:
2555         nfs4_set_cached_acl(inode, acl);
2556 }
2557
2558 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2559 {
2560         struct page *pages[NFS4ACL_MAXPAGES];
2561         struct nfs_getaclargs args = {
2562                 .fh = NFS_FH(inode),
2563                 .acl_pages = pages,
2564                 .acl_len = buflen,
2565         };
2566         size_t resp_len = buflen;
2567         void *resp_buf;
2568         struct rpc_message msg = {
2569                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2570                 .rpc_argp = &args,
2571                 .rpc_resp = &resp_len,
2572         };
2573         struct page *localpage = NULL;
2574         int ret;
2575
2576         if (buflen < PAGE_SIZE) {
2577                 /* As long as we're doing a round trip to the server anyway,
2578                  * let's be prepared for a page of acl data. */
2579                 localpage = alloc_page(GFP_KERNEL);
2580                 resp_buf = page_address(localpage);
2581                 if (localpage == NULL)
2582                         return -ENOMEM;
2583                 args.acl_pages[0] = localpage;
2584                 args.acl_pgbase = 0;
2585                 resp_len = args.acl_len = PAGE_SIZE;
2586         } else {
2587                 resp_buf = buf;
2588                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2589         }
2590         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2591         if (ret)
2592                 goto out_free;
2593         if (resp_len > args.acl_len)
2594                 nfs4_write_cached_acl(inode, NULL, resp_len);
2595         else
2596                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2597         if (buf) {
2598                 ret = -ERANGE;
2599                 if (resp_len > buflen)
2600                         goto out_free;
2601                 if (localpage)
2602                         memcpy(buf, resp_buf, resp_len);
2603         }
2604         ret = resp_len;
2605 out_free:
2606         if (localpage)
2607                 __free_page(localpage);
2608         return ret;
2609 }
2610
2611 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2612 {
2613         struct nfs4_exception exception = { };
2614         ssize_t ret;
2615         do {
2616                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2617                 if (ret >= 0)
2618                         break;
2619                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2620         } while (exception.retry);
2621         return ret;
2622 }
2623
2624 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2625 {
2626         struct nfs_server *server = NFS_SERVER(inode);
2627         int ret;
2628
2629         if (!nfs4_server_supports_acls(server))
2630                 return -EOPNOTSUPP;
2631         ret = nfs_revalidate_inode(server, inode);
2632         if (ret < 0)
2633                 return ret;
2634         ret = nfs4_read_cached_acl(inode, buf, buflen);
2635         if (ret != -ENOENT)
2636                 return ret;
2637         return nfs4_get_acl_uncached(inode, buf, buflen);
2638 }
2639
2640 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2641 {
2642         struct nfs_server *server = NFS_SERVER(inode);
2643         struct page *pages[NFS4ACL_MAXPAGES];
2644         struct nfs_setaclargs arg = {
2645                 .fh             = NFS_FH(inode),
2646                 .acl_pages      = pages,
2647                 .acl_len        = buflen,
2648         };
2649         struct rpc_message msg = {
2650                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2651                 .rpc_argp       = &arg,
2652                 .rpc_resp       = NULL,
2653         };
2654         int ret;
2655
2656         if (!nfs4_server_supports_acls(server))
2657                 return -EOPNOTSUPP;
2658         nfs_inode_return_delegation(inode);
2659         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2660         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2661         nfs_zap_caches(inode);
2662         return ret;
2663 }
2664
2665 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2666 {
2667         struct nfs4_exception exception = { };
2668         int err;
2669         do {
2670                 err = nfs4_handle_exception(NFS_SERVER(inode),
2671                                 __nfs4_proc_set_acl(inode, buf, buflen),
2672                                 &exception);
2673         } while (exception.retry);
2674         return err;
2675 }
2676
2677 static int
2678 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2679 {
2680         struct nfs_client *clp = server->nfs_client;
2681
2682         if (!clp || task->tk_status >= 0)
2683                 return 0;
2684         switch(task->tk_status) {
2685                 case -NFS4ERR_STALE_CLIENTID:
2686                 case -NFS4ERR_STALE_STATEID:
2687                 case -NFS4ERR_EXPIRED:
2688                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2689                         nfs4_schedule_state_recovery(clp);
2690                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2691                                 rpc_wake_up_task(task);
2692                         task->tk_status = 0;
2693                         return -EAGAIN;
2694                 case -NFS4ERR_DELAY:
2695                         nfs_inc_server_stats((struct nfs_server *) server,
2696                                                 NFSIOS_DELAY);
2697                 case -NFS4ERR_GRACE:
2698                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2699                         task->tk_status = 0;
2700                         return -EAGAIN;
2701                 case -NFS4ERR_OLD_STATEID:
2702                         task->tk_status = 0;
2703                         return -EAGAIN;
2704         }
2705         task->tk_status = nfs4_map_errors(task->tk_status);
2706         return 0;
2707 }
2708
2709 static int nfs4_wait_bit_interruptible(void *word)
2710 {
2711         if (signal_pending(current))
2712                 return -ERESTARTSYS;
2713         schedule();
2714         return 0;
2715 }
2716
2717 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2718 {
2719         sigset_t oldset;
2720         int res;
2721
2722         might_sleep();
2723
2724         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2725
2726         rpc_clnt_sigmask(clnt, &oldset);
2727         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2728                         nfs4_wait_bit_interruptible,
2729                         TASK_INTERRUPTIBLE);
2730         rpc_clnt_sigunmask(clnt, &oldset);
2731
2732         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2733         return res;
2734 }
2735
2736 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2737 {
2738         sigset_t oldset;
2739         int res = 0;
2740
2741         might_sleep();
2742
2743         if (*timeout <= 0)
2744                 *timeout = NFS4_POLL_RETRY_MIN;
2745         if (*timeout > NFS4_POLL_RETRY_MAX)
2746                 *timeout = NFS4_POLL_RETRY_MAX;
2747         rpc_clnt_sigmask(clnt, &oldset);
2748         if (clnt->cl_intr) {
2749                 schedule_timeout_interruptible(*timeout);
2750                 if (signalled())
2751                         res = -ERESTARTSYS;
2752         } else
2753                 schedule_timeout_uninterruptible(*timeout);
2754         rpc_clnt_sigunmask(clnt, &oldset);
2755         *timeout <<= 1;
2756         return res;
2757 }
2758
2759 /* This is the error handling routine for processes that are allowed
2760  * to sleep.
2761  */
2762 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2763 {
2764         struct nfs_client *clp = server->nfs_client;
2765         int ret = errorcode;
2766
2767         exception->retry = 0;
2768         switch(errorcode) {
2769                 case 0:
2770                         return 0;
2771                 case -NFS4ERR_STALE_CLIENTID:
2772                 case -NFS4ERR_STALE_STATEID:
2773                 case -NFS4ERR_EXPIRED:
2774                         nfs4_schedule_state_recovery(clp);
2775                         ret = nfs4_wait_clnt_recover(server->client, clp);
2776                         if (ret == 0)
2777                                 exception->retry = 1;
2778                         break;
2779                 case -NFS4ERR_FILE_OPEN:
2780                 case -NFS4ERR_GRACE:
2781                 case -NFS4ERR_DELAY:
2782                         ret = nfs4_delay(server->client, &exception->timeout);
2783                         if (ret != 0)
2784                                 break;
2785                 case -NFS4ERR_OLD_STATEID:
2786                         exception->retry = 1;
2787         }
2788         /* We failed to handle the error */
2789         return nfs4_map_errors(ret);
2790 }
2791
2792 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2793 {
2794         nfs4_verifier sc_verifier;
2795         struct nfs4_setclientid setclientid = {
2796                 .sc_verifier = &sc_verifier,
2797                 .sc_prog = program,
2798         };
2799         struct rpc_message msg = {
2800                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2801                 .rpc_argp = &setclientid,
2802                 .rpc_resp = clp,
2803                 .rpc_cred = cred,
2804         };
2805         __be32 *p;
2806         int loop = 0;
2807         int status;
2808
2809         p = (__be32*)sc_verifier.data;
2810         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2811         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2812
2813         for(;;) {
2814                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2815                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2816                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2817                                 cred->cr_ops->cr_name,
2818                                 clp->cl_id_uniquifier);
2819                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2820                                 sizeof(setclientid.sc_netid), "tcp");
2821                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2822                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2823                                 clp->cl_ipaddr, port >> 8, port & 255);
2824
2825                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2826                 if (status != -NFS4ERR_CLID_INUSE)
2827                         break;
2828                 if (signalled())
2829                         break;
2830                 if (loop++ & 1)
2831                         ssleep(clp->cl_lease_time + 1);
2832                 else
2833                         if (++clp->cl_id_uniquifier == 0)
2834                                 break;
2835         }
2836         return status;
2837 }
2838
2839 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2840 {
2841         struct nfs_fsinfo fsinfo;
2842         struct rpc_message msg = {
2843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2844                 .rpc_argp = clp,
2845                 .rpc_resp = &fsinfo,
2846                 .rpc_cred = cred,
2847         };
2848         unsigned long now;
2849         int status;
2850
2851         now = jiffies;
2852         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2853         if (status == 0) {
2854                 spin_lock(&clp->cl_lock);
2855                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2856                 clp->cl_last_renewal = now;
2857                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2858                 spin_unlock(&clp->cl_lock);
2859         }
2860         return status;
2861 }
2862
2863 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2864 {
2865         long timeout;
2866         int err;
2867         do {
2868                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2869                 switch (err) {
2870                         case 0:
2871                                 return err;
2872                         case -NFS4ERR_RESOURCE:
2873                                 /* The IBM lawyers misread another document! */
2874                         case -NFS4ERR_DELAY:
2875                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2876                 }
2877         } while (err == 0);
2878         return err;
2879 }
2880
2881 struct nfs4_delegreturndata {
2882         struct nfs4_delegreturnargs args;
2883         struct nfs4_delegreturnres res;
2884         struct nfs_fh fh;
2885         nfs4_stateid stateid;
2886         struct rpc_cred *cred;
2887         unsigned long timestamp;
2888         struct nfs_fattr fattr;
2889         int rpc_status;
2890 };
2891
2892 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2893 {
2894         struct nfs4_delegreturndata *data = calldata;
2895         struct rpc_message msg = {
2896                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2897                 .rpc_argp = &data->args,
2898                 .rpc_resp = &data->res,
2899                 .rpc_cred = data->cred,
2900         };
2901         nfs_fattr_init(data->res.fattr);
2902         rpc_call_setup(task, &msg, 0);
2903 }
2904
2905 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2906 {
2907         struct nfs4_delegreturndata *data = calldata;
2908         data->rpc_status = task->tk_status;
2909         if (data->rpc_status == 0)
2910                 renew_lease(data->res.server, data->timestamp);
2911 }
2912
2913 static void nfs4_delegreturn_release(void *calldata)
2914 {
2915         struct nfs4_delegreturndata *data = calldata;
2916
2917         put_rpccred(data->cred);
2918         kfree(calldata);
2919 }
2920
2921 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2922         .rpc_call_prepare = nfs4_delegreturn_prepare,
2923         .rpc_call_done = nfs4_delegreturn_done,
2924         .rpc_release = nfs4_delegreturn_release,
2925 };
2926
2927 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2928 {
2929         struct nfs4_delegreturndata *data;
2930         struct nfs_server *server = NFS_SERVER(inode);
2931         struct rpc_task *task;
2932         int status;
2933
2934         data = kmalloc(sizeof(*data), GFP_KERNEL);
2935         if (data == NULL)
2936                 return -ENOMEM;
2937         data->args.fhandle = &data->fh;
2938         data->args.stateid = &data->stateid;
2939         data->args.bitmask = server->attr_bitmask;
2940         nfs_copy_fh(&data->fh, NFS_FH(inode));
2941         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2942         data->res.fattr = &data->fattr;
2943         data->res.server = server;
2944         data->cred = get_rpccred(cred);
2945         data->timestamp = jiffies;
2946         data->rpc_status = 0;
2947
2948         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2949         if (IS_ERR(task))
2950                 return PTR_ERR(task);
2951         status = nfs4_wait_for_completion_rpc_task(task);
2952         if (status == 0) {
2953                 status = data->rpc_status;
2954                 if (status == 0)
2955                         nfs_post_op_update_inode(inode, &data->fattr);
2956         }
2957         rpc_put_task(task);
2958         return status;
2959 }
2960
2961 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2962 {
2963         struct nfs_server *server = NFS_SERVER(inode);
2964         struct nfs4_exception exception = { };
2965         int err;
2966         do {
2967                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2968                 switch (err) {
2969                         case -NFS4ERR_STALE_STATEID:
2970                         case -NFS4ERR_EXPIRED:
2971                         case 0:
2972                                 return 0;
2973                 }
2974                 err = nfs4_handle_exception(server, err, &exception);
2975         } while (exception.retry);
2976         return err;
2977 }
2978
2979 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2980 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2981
2982 /*
2983  * sleep, with exponential backoff, and retry the LOCK operation.
2984  */
2985 static unsigned long
2986 nfs4_set_lock_task_retry(unsigned long timeout)
2987 {
2988         schedule_timeout_interruptible(timeout);
2989         timeout <<= 1;
2990         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2991                 return NFS4_LOCK_MAXTIMEOUT;
2992         return timeout;
2993 }
2994
2995 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2996 {
2997         struct inode *inode = state->inode;
2998         struct nfs_server *server = NFS_SERVER(inode);
2999         struct nfs_client *clp = server->nfs_client;
3000         struct nfs_lockt_args arg = {
3001                 .fh = NFS_FH(inode),
3002                 .fl = request,
3003         };
3004         struct nfs_lockt_res res = {
3005                 .denied = request,
3006         };
3007         struct rpc_message msg = {
3008                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3009                 .rpc_argp       = &arg,
3010                 .rpc_resp       = &res,
3011                 .rpc_cred       = state->owner->so_cred,
3012         };
3013         struct nfs4_lock_state *lsp;
3014         int status;
3015
3016         down_read(&clp->cl_sem);
3017         arg.lock_owner.clientid = clp->cl_clientid;
3018         status = nfs4_set_lock_state(state, request);
3019         if (status != 0)
3020                 goto out;
3021         lsp = request->fl_u.nfs4_fl.owner;
3022         arg.lock_owner.id = lsp->ls_id;
3023         status = rpc_call_sync(server->client, &msg, 0);
3024         switch (status) {
3025                 case 0:
3026                         request->fl_type = F_UNLCK;
3027                         break;
3028                 case -NFS4ERR_DENIED:
3029                         status = 0;
3030         }
3031         request->fl_ops->fl_release_private(request);
3032 out:
3033         up_read(&clp->cl_sem);
3034         return status;
3035 }
3036
3037 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3038 {
3039         struct nfs4_exception exception = { };
3040         int err;
3041
3042         do {
3043                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3044                                 _nfs4_proc_getlk(state, cmd, request),
3045                                 &exception);
3046         } while (exception.retry);
3047         return err;
3048 }
3049
3050 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3051 {
3052         int res = 0;
3053         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3054                 case FL_POSIX:
3055                         res = posix_lock_file_wait(file, fl);
3056                         break;
3057                 case FL_FLOCK:
3058                         res = flock_lock_file_wait(file, fl);
3059                         break;
3060                 default:
3061                         BUG();
3062         }
3063         return res;
3064 }
3065
3066 struct nfs4_unlockdata {
3067         struct nfs_locku_args arg;
3068         struct nfs_locku_res res;
3069         struct nfs4_lock_state *lsp;
3070         struct nfs_open_context *ctx;
3071         struct file_lock fl;
3072         const struct nfs_server *server;
3073         unsigned long timestamp;
3074 };
3075
3076 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3077                 struct nfs_open_context *ctx,
3078                 struct nfs4_lock_state *lsp,
3079                 struct nfs_seqid *seqid)
3080 {
3081         struct nfs4_unlockdata *p;
3082         struct inode *inode = lsp->ls_state->inode;
3083
3084         p = kmalloc(sizeof(*p), GFP_KERNEL);
3085         if (p == NULL)
3086                 return NULL;
3087         p->arg.fh = NFS_FH(inode);
3088         p->arg.fl = &p->fl;
3089         p->arg.seqid = seqid;
3090         p->arg.stateid = &lsp->ls_stateid;
3091         p->lsp = lsp;
3092         atomic_inc(&lsp->ls_count);
3093         /* Ensure we don't close file until we're done freeing locks! */
3094         p->ctx = get_nfs_open_context(ctx);
3095         memcpy(&p->fl, fl, sizeof(p->fl));
3096         p->server = NFS_SERVER(inode);
3097         return p;
3098 }
3099
3100 static void nfs4_locku_release_calldata(void *data)
3101 {
3102         struct nfs4_unlockdata *calldata = data;
3103         nfs_free_seqid(calldata->arg.seqid);
3104         nfs4_put_lock_state(calldata->lsp);
3105         put_nfs_open_context(calldata->ctx);
3106         kfree(calldata);
3107 }
3108
3109 static void nfs4_locku_done(struct rpc_task *task, void *data)
3110 {
3111         struct nfs4_unlockdata *calldata = data;
3112
3113         if (RPC_ASSASSINATED(task))
3114                 return;
3115         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3116         switch (task->tk_status) {
3117                 case 0:
3118                         memcpy(calldata->lsp->ls_stateid.data,
3119                                         calldata->res.stateid.data,
3120                                         sizeof(calldata->lsp->ls_stateid.data));
3121                         renew_lease(calldata->server, calldata->timestamp);
3122                         break;
3123                 case -NFS4ERR_STALE_STATEID:
3124                 case -NFS4ERR_EXPIRED:
3125                         break;
3126                 default:
3127                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3128                                 rpc_restart_call(task);
3129         }
3130 }
3131
3132 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3133 {
3134         struct nfs4_unlockdata *calldata = data;
3135         struct rpc_message msg = {
3136                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3137                 .rpc_argp       = &calldata->arg,
3138                 .rpc_resp       = &calldata->res,
3139                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3140         };
3141
3142         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3143                 return;
3144         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3145                 /* Note: exit _without_ running nfs4_locku_done */
3146                 task->tk_action = NULL;
3147                 return;
3148         }
3149         calldata->timestamp = jiffies;
3150         rpc_call_setup(task, &msg, 0);
3151 }
3152
3153 static const struct rpc_call_ops nfs4_locku_ops = {
3154         .rpc_call_prepare = nfs4_locku_prepare,
3155         .rpc_call_done = nfs4_locku_done,
3156         .rpc_release = nfs4_locku_release_calldata,
3157 };
3158
3159 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3160                 struct nfs_open_context *ctx,
3161                 struct nfs4_lock_state *lsp,
3162                 struct nfs_seqid *seqid)
3163 {
3164         struct nfs4_unlockdata *data;
3165
3166         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3167         if (data == NULL) {
3168                 nfs_free_seqid(seqid);
3169                 return ERR_PTR(-ENOMEM);
3170         }
3171
3172         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3173 }
3174
3175 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3176 {
3177         struct nfs_seqid *seqid;
3178         struct nfs4_lock_state *lsp;
3179         struct rpc_task *task;
3180         int status = 0;
3181
3182         status = nfs4_set_lock_state(state, request);
3183         /* Unlock _before_ we do the RPC call */
3184         request->fl_flags |= FL_EXISTS;
3185         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3186                 goto out;
3187         if (status != 0)
3188                 goto out;
3189         /* Is this a delegated lock? */
3190         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3191                 goto out;
3192         lsp = request->fl_u.nfs4_fl.owner;
3193         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3194         status = -ENOMEM;
3195         if (seqid == NULL)
3196                 goto out;
3197         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3198         status = PTR_ERR(task);
3199         if (IS_ERR(task))
3200                 goto out;
3201         status = nfs4_wait_for_completion_rpc_task(task);
3202         rpc_put_task(task);
3203 out:
3204         return status;
3205 }
3206
3207 struct nfs4_lockdata {
3208         struct nfs_lock_args arg;
3209         struct nfs_lock_res res;
3210         struct nfs4_lock_state *lsp;
3211         struct nfs_open_context *ctx;
3212         struct file_lock fl;
3213         unsigned long timestamp;
3214         int rpc_status;
3215         int cancelled;
3216 };
3217
3218 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3219                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3220 {
3221         struct nfs4_lockdata *p;
3222         struct inode *inode = lsp->ls_state->inode;
3223         struct nfs_server *server = NFS_SERVER(inode);
3224
3225         p = kzalloc(sizeof(*p), GFP_KERNEL);
3226         if (p == NULL)
3227                 return NULL;
3228
3229         p->arg.fh = NFS_FH(inode);
3230         p->arg.fl = &p->fl;
3231         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3232         if (p->arg.lock_seqid == NULL)
3233                 goto out_free;
3234         p->arg.lock_stateid = &lsp->ls_stateid;
3235         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3236         p->arg.lock_owner.id = lsp->ls_id;
3237         p->lsp = lsp;
3238         atomic_inc(&lsp->ls_count);
3239         p->ctx = get_nfs_open_context(ctx);
3240         memcpy(&p->fl, fl, sizeof(p->fl));
3241         return p;
3242 out_free:
3243         kfree(p);
3244         return NULL;
3245 }
3246
3247 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3248 {
3249         struct nfs4_lockdata *data = calldata;
3250         struct nfs4_state *state = data->lsp->ls_state;
3251         struct nfs4_state_owner *sp = state->owner;
3252         struct rpc_message msg = {
3253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3254                 .rpc_argp = &data->arg,
3255                 .rpc_resp = &data->res,
3256                 .rpc_cred = sp->so_cred,
3257         };
3258
3259         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3260                 return;
3261         dprintk("%s: begin!\n", __FUNCTION__);
3262         /* Do we need to do an open_to_lock_owner? */
3263         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3264                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3265                 if (data->arg.open_seqid == NULL) {
3266                         data->rpc_status = -ENOMEM;
3267                         task->tk_action = NULL;
3268                         goto out;
3269                 }
3270                 data->arg.open_stateid = &state->stateid;
3271                 data->arg.new_lock_owner = 1;
3272         }
3273         data->timestamp = jiffies;
3274         rpc_call_setup(task, &msg, 0);
3275 out:
3276         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3277 }
3278
3279 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3280 {
3281         struct nfs4_lockdata *data = calldata;
3282
3283         dprintk("%s: begin!\n", __FUNCTION__);
3284
3285         data->rpc_status = task->tk_status;
3286         if (RPC_ASSASSINATED(task))
3287                 goto out;
3288         if (data->arg.new_lock_owner != 0) {
3289                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3290                 if (data->rpc_status == 0)
3291                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3292                 else
3293                         goto out;
3294         }
3295         if (data->rpc_status == 0) {
3296                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3297                                         sizeof(data->lsp->ls_stateid.data));
3298                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3299                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3300         }
3301         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3302 out:
3303         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3304 }
3305
3306 static void nfs4_lock_release(void *calldata)
3307 {
3308         struct nfs4_lockdata *data = calldata;
3309
3310         dprintk("%s: begin!\n", __FUNCTION__);
3311         if (data->arg.open_seqid != NULL)
3312                 nfs_free_seqid(data->arg.open_seqid);
3313         if (data->cancelled != 0) {
3314                 struct rpc_task *task;
3315                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3316                                 data->arg.lock_seqid);
3317                 if (!IS_ERR(task))
3318                         rpc_put_task(task);
3319                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3320         } else
3321                 nfs_free_seqid(data->arg.lock_seqid);
3322         nfs4_put_lock_state(data->lsp);
3323         put_nfs_open_context(data->ctx);
3324         kfree(data);
3325         dprintk("%s: done!\n", __FUNCTION__);
3326 }
3327
3328 static const struct rpc_call_ops nfs4_lock_ops = {
3329         .rpc_call_prepare = nfs4_lock_prepare,
3330         .rpc_call_done = nfs4_lock_done,
3331         .rpc_release = nfs4_lock_release,
3332 };
3333
3334 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3335 {
3336         struct nfs4_lockdata *data;
3337         struct rpc_task *task;
3338         int ret;
3339
3340         dprintk("%s: begin!\n", __FUNCTION__);
3341         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3342                         fl->fl_u.nfs4_fl.owner);
3343         if (data == NULL)
3344                 return -ENOMEM;
3345         if (IS_SETLKW(cmd))
3346                 data->arg.block = 1;
3347         if (reclaim != 0)
3348                 data->arg.reclaim = 1;
3349         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3350                         &nfs4_lock_ops, data);
3351         if (IS_ERR(task))
3352                 return PTR_ERR(task);
3353         ret = nfs4_wait_for_completion_rpc_task(task);
3354         if (ret == 0) {
3355                 ret = data->rpc_status;
3356                 if (ret == -NFS4ERR_DENIED)
3357                         ret = -EAGAIN;
3358         } else
3359                 data->cancelled = 1;
3360         rpc_put_task(task);
3361         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3362         return ret;
3363 }
3364
3365 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3366 {
3367         struct nfs_server *server = NFS_SERVER(state->inode);
3368         struct nfs4_exception exception = { };
3369         int err;
3370
3371         do {
3372                 /* Cache the lock if possible... */
3373                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3374                         return 0;
3375                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3376                 if (err != -NFS4ERR_DELAY)
3377                         break;
3378                 nfs4_handle_exception(server, err, &exception);
3379         } while (exception.retry);
3380         return err;
3381 }
3382
3383 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3384 {
3385         struct nfs_server *server = NFS_SERVER(state->inode);
3386         struct nfs4_exception exception = { };
3387         int err;
3388
3389         err = nfs4_set_lock_state(state, request);
3390         if (err != 0)
3391                 return err;
3392         do {
3393                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3394                         return 0;
3395                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3396                 if (err != -NFS4ERR_DELAY)
3397                         break;
3398                 nfs4_handle_exception(server, err, &exception);
3399         } while (exception.retry);
3400         return err;
3401 }
3402
3403 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3404 {
3405         struct nfs_client *clp = state->owner->so_client;
3406         unsigned char fl_flags = request->fl_flags;
3407         int status;
3408
3409         /* Is this a delegated open? */
3410         status = nfs4_set_lock_state(state, request);
3411         if (status != 0)
3412                 goto out;
3413         request->fl_flags |= FL_ACCESS;
3414         status = do_vfs_lock(request->fl_file, request);
3415         if (status < 0)
3416                 goto out;
3417         down_read(&clp->cl_sem);
3418         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3419                 struct nfs_inode *nfsi = NFS_I(state->inode);
3420                 /* Yes: cache locks! */
3421                 down_read(&nfsi->rwsem);
3422                 /* ...but avoid races with delegation recall... */
3423                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3424                         request->fl_flags = fl_flags & ~FL_SLEEP;
3425                         status = do_vfs_lock(request->fl_file, request);
3426                         up_read(&nfsi->rwsem);
3427                         goto out_unlock;
3428                 }
3429                 up_read(&nfsi->rwsem);
3430         }
3431         status = _nfs4_do_setlk(state, cmd, request, 0);
3432         if (status != 0)
3433                 goto out_unlock;
3434         /* Note: we always want to sleep here! */
3435         request->fl_flags = fl_flags | FL_SLEEP;
3436         if (do_vfs_lock(request->fl_file, request) < 0)
3437                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3438 out_unlock:
3439         up_read(&clp->cl_sem);
3440 out:
3441         request->fl_flags = fl_flags;
3442         return status;
3443 }
3444
3445 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3446 {
3447         struct nfs4_exception exception = { };
3448         int err;
3449
3450         do {
3451                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3452                                 _nfs4_proc_setlk(state, cmd, request),
3453                                 &exception);
3454         } while (exception.retry);
3455         return err;
3456 }
3457
3458 static int
3459 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3460 {
3461         struct nfs_open_context *ctx;
3462         struct nfs4_state *state;
3463         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3464         int status;
3465
3466         /* verify open state */
3467         ctx = (struct nfs_open_context *)filp->private_data;
3468         state = ctx->state;
3469
3470         if (request->fl_start < 0 || request->fl_end < 0)
3471                 return -EINVAL;
3472
3473         if (IS_GETLK(cmd))
3474                 return nfs4_proc_getlk(state, F_GETLK, request);
3475
3476         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3477                 return -EINVAL;
3478
3479         if (request->fl_type == F_UNLCK)
3480                 return nfs4_proc_unlck(state, cmd, request);
3481
3482         do {
3483                 status = nfs4_proc_setlk(state, cmd, request);
3484                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3485                         break;
3486                 timeout = nfs4_set_lock_task_retry(timeout);
3487                 status = -ERESTARTSYS;
3488                 if (signalled())
3489                         break;
3490         } while(status < 0);
3491         return status;
3492 }
3493
3494 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3495 {
3496         struct nfs_server *server = NFS_SERVER(state->inode);
3497         struct nfs4_exception exception = { };
3498         int err;
3499
3500         err = nfs4_set_lock_state(state, fl);
3501         if (err != 0)
3502                 goto out;
3503         do {
3504                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3505                 if (err != -NFS4ERR_DELAY)
3506                         break;
3507                 err = nfs4_handle_exception(server, err, &exception);
3508         } while (exception.retry);
3509 out:
3510         return err;
3511 }
3512
3513 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3514
3515 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3516                 size_t buflen, int flags)
3517 {
3518         struct inode *inode = dentry->d_inode;
3519
3520         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3521                 return -EOPNOTSUPP;
3522
3523         if (!S_ISREG(inode->i_mode) &&
3524             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3525                 return -EPERM;
3526
3527         return nfs4_proc_set_acl(inode, buf, buflen);
3528 }
3529
3530 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3531  * and that's what we'll do for e.g. user attributes that haven't been set.
3532  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3533  * attributes in kernel-managed attribute namespaces. */
3534 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3535                 size_t buflen)
3536 {
3537         struct inode *inode = dentry->d_inode;
3538
3539         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3540                 return -EOPNOTSUPP;
3541
3542         return nfs4_proc_get_acl(inode, buf, buflen);
3543 }
3544
3545 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3546 {
3547         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3548
3549         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3550                 return 0;
3551         if (buf && buflen < len)
3552                 return -ERANGE;
3553         if (buf)
3554                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3555         return len;
3556 }
3557
3558 int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3559                 struct nfs4_fs_locations *fs_locations, struct page *page)
3560 {
3561         struct nfs_server *server = NFS_SERVER(dir);
3562         u32 bitmask[2] = {
3563                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3564                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3565         };
3566         struct nfs4_fs_locations_arg args = {
3567                 .dir_fh = NFS_FH(dir),
3568                 .name = name,
3569                 .page = page,
3570                 .bitmask = bitmask,
3571         };
3572         struct rpc_message msg = {
3573                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3574                 .rpc_argp = &args,
3575                 .rpc_resp = fs_locations,
3576         };
3577         int status;
3578
3579         dprintk("%s: start\n", __FUNCTION__);
3580         nfs_fattr_init(&fs_locations->fattr);
3581         fs_locations->server = server;
3582         fs_locations->nlocations = 0;
3583         status = rpc_call_sync(server->client, &msg, 0);
3584         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3585         return status;
3586 }
3587
3588 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3589         .recover_open   = nfs4_open_reclaim,
3590         .recover_lock   = nfs4_lock_reclaim,
3591 };
3592
3593 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3594         .recover_open   = nfs4_open_expired,
3595         .recover_lock   = nfs4_lock_expired,
3596 };
3597
3598 static const struct inode_operations nfs4_file_inode_operations = {
3599         .permission     = nfs_permission,
3600         .getattr        = nfs_getattr,
3601         .setattr        = nfs_setattr,
3602         .getxattr       = nfs4_getxattr,
3603         .setxattr       = nfs4_setxattr,
3604         .listxattr      = nfs4_listxattr,
3605 };
3606
3607 const struct nfs_rpc_ops nfs_v4_clientops = {
3608         .version        = 4,                    /* protocol version */
3609         .dentry_ops     = &nfs4_dentry_operations,
3610         .dir_inode_ops  = &nfs4_dir_inode_operations,
3611         .file_inode_ops = &nfs4_file_inode_operations,
3612         .getroot        = nfs4_proc_get_root,
3613         .getattr        = nfs4_proc_getattr,
3614         .setattr        = nfs4_proc_setattr,
3615         .lookupfh       = nfs4_proc_lookupfh,
3616         .lookup         = nfs4_proc_lookup,
3617         .access         = nfs4_proc_access,
3618         .readlink       = nfs4_proc_readlink,
3619         .create         = nfs4_proc_create,
3620         .remove         = nfs4_proc_remove,
3621         .unlink_setup   = nfs4_proc_unlink_setup,
3622         .unlink_done    = nfs4_proc_unlink_done,
3623         .rename         = nfs4_proc_rename,
3624         .link           = nfs4_proc_link,
3625         .symlink        = nfs4_proc_symlink,
3626         .mkdir          = nfs4_proc_mkdir,
3627         .rmdir          = nfs4_proc_remove,
3628         .readdir        = nfs4_proc_readdir,
3629         .mknod          = nfs4_proc_mknod,
3630         .statfs         = nfs4_proc_statfs,
3631         .fsinfo         = nfs4_proc_fsinfo,
3632         .pathconf       = nfs4_proc_pathconf,
3633         .set_capabilities = nfs4_server_capabilities,
3634         .decode_dirent  = nfs4_decode_dirent,
3635         .read_setup     = nfs4_proc_read_setup,
3636         .read_done      = nfs4_read_done,
3637         .write_setup    = nfs4_proc_write_setup,
3638         .write_done     = nfs4_write_done,
3639         .commit_setup   = nfs4_proc_commit_setup,
3640         .commit_done    = nfs4_commit_done,
3641         .file_open      = nfs_open,
3642         .file_release   = nfs_release,
3643         .lock           = nfs4_proc_lock,
3644         .clear_acl_cache = nfs4_zap_acl_attr,
3645 };
3646
3647 /*
3648  * Local variables:
3649  *  c-basic-offset: 8
3650  * End:
3651  */