err.no Git - linux-2.6/blob - 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 dentry *dentry;
 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 dentry *dentry,
 234                 struct nfs4_state_owner *sp, int flags,
 235                 const struct iattr *attrs)
 236 {
 237         struct dentry *parent = dget_parent(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->dentry = dget(dentry);
 250         p->dir = parent;
 251         p->owner = sp;
 252         atomic_inc(&sp->so_count);
 253         p->o_arg.fh = NFS_FH(dir);
 254         p->o_arg.open_flags = flags,
 255         p->o_arg.clientid = server->nfs_client->cl_clientid;
 256         p->o_arg.id = sp->so_id;
 257         p->o_arg.name = &dentry->d_name;
 258         p->o_arg.server = server;
 259         p->o_arg.bitmask = server->attr_bitmask;
 260         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 261         p->o_res.f_attr = &p->f_attr;
 262         p->o_res.dir_attr = &p->dir_attr;
 263         p->o_res.server = server;
 264         nfs_fattr_init(&p->f_attr);
 265         nfs_fattr_init(&p->dir_attr);
 266         if (flags & O_EXCL) {
 267                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 268                 s[0] = jiffies;
 269                 s[1] = current->pid;
 270         } else if (flags & O_CREAT) {
 271                 p->o_arg.u.attrs = &p->attrs;
 272                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 273         }
 274         p->c_arg.fh = &p->o_res.fh;
 275         p->c_arg.stateid = &p->o_res.stateid;
 276         p->c_arg.seqid = p->o_arg.seqid;
 277         return p;
 278 err_free:
 279         kfree(p);
 280 err:
 281         dput(parent);
 282         return NULL;
 283 }
 284
 285 static void nfs4_opendata_free(struct nfs4_opendata *p)
 286 {
 287         if (p != NULL && atomic_dec_and_test(&p->count)) {
 288                 nfs_free_seqid(p->o_arg.seqid);
 289                 nfs4_put_state_owner(p->owner);
 290                 dput(p->dir);
 291                 dput(p->dentry);
 292                 kfree(p);
 293         }
 294 }
 295
 296 /* Helper for asynchronous RPC calls */
 297 static int nfs4_call_async(struct rpc_clnt *clnt,
 298                 const struct rpc_call_ops *tk_ops, void *calldata)
 299 {
 300         struct rpc_task *task;
 301
 302         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 303                 return -ENOMEM;
 304         rpc_execute(task);
 305         return 0;
 306 }
 307
 308 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 309 {
 310         sigset_t oldset;
 311         int ret;
 312
 313         rpc_clnt_sigmask(task->tk_client, &oldset);
 314         ret = rpc_wait_for_completion_task(task);
 315         rpc_clnt_sigunmask(task->tk_client, &oldset);
 316         return ret;
 317 }
 318
 319 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 320 {
 321         switch (open_flags) {
 322                 case FMODE_WRITE:
 323                         state->n_wronly++;
 324                         break;
 325                 case FMODE_READ:
 326                         state->n_rdonly++;
 327                         break;
 328                 case FMODE_READ|FMODE_WRITE:
 329                         state->n_rdwr++;
 330         }
 331 }
 332
 333 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 334 {
 335         struct inode *inode = state->inode;
 336
 337         open_flags &= (FMODE_READ|FMODE_WRITE);
 338         /* Protect against nfs4_find_state_byowner() */
 339         spin_lock(&state->owner->so_lock);
 340         spin_lock(&inode->i_lock);
 341         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 342         update_open_stateflags(state, open_flags);
 343         nfs4_state_set_mode_locked(state, state->state | open_flags);
 344         spin_unlock(&inode->i_lock);
 345         spin_unlock(&state->owner->so_lock);
 346 }
 347
 348 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 349 {
 350         struct inode *inode;
 351         struct nfs4_state *state = NULL;
 352
 353         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 354                 goto out;
 355         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 356         if (IS_ERR(inode))
 357                 goto out;
 358         state = nfs4_get_open_state(inode, data->owner);
 359         if (state == NULL)
 360                 goto put_inode;
 361         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 362 put_inode:
 363         iput(inode);
 364 out:
 365         return state;
 366 }
 367
 368 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 369 {
 370         struct nfs_inode *nfsi = NFS_I(state->inode);
 371         struct nfs_open_context *ctx;
 372
 373         spin_lock(&state->inode->i_lock);
 374         list_for_each_entry(ctx, &nfsi->open_files, list) {
 375                 if (ctx->state != state)
 376                         continue;
 377                 get_nfs_open_context(ctx);
 378                 spin_unlock(&state->inode->i_lock);
 379                 return ctx;
 380         }
 381         spin_unlock(&state->inode->i_lock);
 382         return ERR_PTR(-ENOENT);
 383 }
 384
 385 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 386 {
 387         int ret;
 388
 389         opendata->o_arg.open_flags = openflags;
 390         ret = _nfs4_proc_open(opendata);
 391         if (ret != 0)
 392                 return ret;
 393         memcpy(stateid->data, opendata->o_res.stateid.data,
 394                         sizeof(stateid->data));
 395         return 0;
 396 }
 397
 398 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 399 {
 400         nfs4_stateid stateid;
 401         struct nfs4_state *newstate;
 402         int mode = 0;
 403         int delegation = 0;
 404         int ret;
 405
 406         /* memory barrier prior to reading state->n_* */
 407         smp_rmb();
 408         if (state->n_rdwr != 0) {
 409                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 410                 if (ret != 0)
 411                         return ret;
 412                 mode |= FMODE_READ|FMODE_WRITE;
 413                 if (opendata->o_res.delegation_type != 0)
 414                         delegation = opendata->o_res.delegation_type;
 415                 smp_rmb();
 416         }
 417         if (state->n_wronly != 0) {
 418                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 419                 if (ret != 0)
 420                         return ret;
 421                 mode |= FMODE_WRITE;
 422                 if (opendata->o_res.delegation_type != 0)
 423                         delegation = opendata->o_res.delegation_type;
 424                 smp_rmb();
 425         }
 426         if (state->n_rdonly != 0) {
 427                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 428                 if (ret != 0)
 429                         return ret;
 430                 mode |= FMODE_READ;
 431         }
 432         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 433         if (mode == 0)
 434                 return 0;
 435         if (opendata->o_res.delegation_type == 0)
 436                 opendata->o_res.delegation_type = delegation;
 437         opendata->o_arg.open_flags |= mode;
 438         newstate = nfs4_opendata_to_nfs4_state(opendata);
 439         if (newstate != NULL) {
 440                 if (opendata->o_res.delegation_type != 0) {
 441                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 442                         int delegation_flags = 0;
 443                         if (nfsi->delegation)
 444                                 delegation_flags = nfsi->delegation->flags;
 445                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 446                                 nfs_inode_set_delegation(newstate->inode,
 447                                                 opendata->owner->so_cred,
 448                                                 &opendata->o_res);
 449                         else
 450                                 nfs_inode_reclaim_delegation(newstate->inode,
 451                                                 opendata->owner->so_cred,
 452                                                 &opendata->o_res);
 453                 }
 454                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
 455         }
 456         if (newstate != state)
 457                 return -ESTALE;
 458         return 0;
 459 }
 460
 461 /*
 462  * OPEN_RECLAIM:
 463  *      reclaim state on the server after a reboot.
 464  */
 465 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 466 {
 467         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 468         struct nfs4_opendata *opendata;
 469         int delegation_type = 0;
 470         int status;
 471
 472         if (delegation != NULL) {
 473                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 474                         memcpy(&state->stateid, &delegation->stateid,
 475                                         sizeof(state->stateid));
 476                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 477                         return 0;
 478                 }
 479                 delegation_type = delegation->type;
 480         }
 481         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 482         if (opendata == NULL)
 483                 return -ENOMEM;
 484         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 485         opendata->o_arg.fh = NFS_FH(state->inode);
 486         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 487         opendata->o_arg.u.delegation_type = delegation_type;
 488         status = nfs4_open_recover(opendata, state);
 489         nfs4_opendata_free(opendata);
 490         return status;
 491 }
 492
 493 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 494 {
 495         struct nfs_server *server = NFS_SERVER(state->inode);
 496         struct nfs4_exception exception = { };
 497         int err;
 498         do {
 499                 err = _nfs4_do_open_reclaim(sp, state, dentry);
 500                 if (err != -NFS4ERR_DELAY)
 501                         break;
 502                 nfs4_handle_exception(server, err, &exception);
 503         } while (exception.retry);
 504         return err;
 505 }
 506
 507 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 508 {
 509         struct nfs_open_context *ctx;
 510         int ret;
 511
 512         ctx = nfs4_state_find_open_context(state);
 513         if (IS_ERR(ctx))
 514                 return PTR_ERR(ctx);
 515         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
 516         put_nfs_open_context(ctx);
 517         return ret;
 518 }
 519
 520 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 521 {
 522         struct nfs4_state_owner  *sp  = state->owner;
 523         struct nfs4_opendata *opendata;
 524         int ret;
 525
 526         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 527                 return 0;
 528         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 529         if (opendata == NULL)
 530                 return -ENOMEM;
 531         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 532         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 533                         sizeof(opendata->o_arg.u.delegation.data));
 534         ret = nfs4_open_recover(opendata, state);
 535         nfs4_opendata_free(opendata);
 536         return ret;
 537 }
 538
 539 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 540 {
 541         struct nfs4_exception exception = { };
 542         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 543         int err;
 544         do {
 545                 err = _nfs4_open_delegation_recall(dentry, state);
 546                 switch (err) {
 547                         case 0:
 548                                 return err;
 549                         case -NFS4ERR_STALE_CLIENTID:
 550                         case -NFS4ERR_STALE_STATEID:
 551                         case -NFS4ERR_EXPIRED:
 552                                 /* Don't recall a delegation if it was lost */
 553                                 nfs4_schedule_state_recovery(server->nfs_client);
 554                                 return err;
 555                 }
 556                 err = nfs4_handle_exception(server, err, &exception);
 557         } while (exception.retry);
 558         return err;
 559 }
 560
 561 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 562 {
 563         struct nfs4_opendata *data = calldata;
 564         struct  rpc_message msg = {
 565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 566                 .rpc_argp = &data->c_arg,
 567                 .rpc_resp = &data->c_res,
 568                 .rpc_cred = data->owner->so_cred,
 569         };
 570         data->timestamp = jiffies;
 571         rpc_call_setup(task, &msg, 0);
 572 }
 573
 574 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 575 {
 576         struct nfs4_opendata *data = calldata;
 577
 578         data->rpc_status = task->tk_status;
 579         if (RPC_ASSASSINATED(task))
 580                 return;
 581         if (data->rpc_status == 0) {
 582                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 583                                 sizeof(data->o_res.stateid.data));
 584                 renew_lease(data->o_res.server, data->timestamp);
 585         }
 586         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 587         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 588 }
 589
 590 static void nfs4_open_confirm_release(void *calldata)
 591 {
 592         struct nfs4_opendata *data = calldata;
 593         struct nfs4_state *state = NULL;
 594
 595         /* If this request hasn't been cancelled, do nothing */
 596         if (data->cancelled == 0)
 597                 goto out_free;
 598         /* In case of error, no cleanup! */
 599         if (data->rpc_status != 0)
 600                 goto out_free;
 601         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 602         state = nfs4_opendata_to_nfs4_state(data);
 603         if (state != NULL)
 604                 nfs4_close_state(state, data->o_arg.open_flags);
 605 out_free:
 606         nfs4_opendata_free(data);
 607 }
 608
 609 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 610         .rpc_call_prepare = nfs4_open_confirm_prepare,
 611         .rpc_call_done = nfs4_open_confirm_done,
 612         .rpc_release = nfs4_open_confirm_release,
 613 };
 614
 615 /*
 616  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 617  */
 618 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 619 {
 620         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 621         struct rpc_task *task;
 622         int status;
 623
 624         atomic_inc(&data->count);
 625         /*
 626          * If rpc_run_task() ends up calling ->rpc_release(), we
 627          * want to ensure that it takes the 'error' code path.
 628          */
 629         data->rpc_status = -ENOMEM;
 630         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 631         if (IS_ERR(task))
 632                 return PTR_ERR(task);
 633         status = nfs4_wait_for_completion_rpc_task(task);
 634         if (status != 0) {
 635                 data->cancelled = 1;
 636                 smp_wmb();
 637         } else
 638                 status = data->rpc_status;
 639         rpc_put_task(task);
 640         return status;
 641 }
 642
 643 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 644 {
 645         struct nfs4_opendata *data = calldata;
 646         struct nfs4_state_owner *sp = data->owner;
 647         struct rpc_message msg = {
 648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 649                 .rpc_argp = &data->o_arg,
 650                 .rpc_resp = &data->o_res,
 651                 .rpc_cred = sp->so_cred,
 652         };
 653
 654         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 655                 return;
 656         /* Update sequence id. */
 657         data->o_arg.id = sp->so_id;
 658         data->o_arg.clientid = sp->so_client->cl_clientid;
 659         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 660                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 661         data->timestamp = jiffies;
 662         rpc_call_setup(task, &msg, 0);
 663 }
 664
 665 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 666 {
 667         struct nfs4_opendata *data = calldata;
 668
 669         data->rpc_status = task->tk_status;
 670         if (RPC_ASSASSINATED(task))
 671                 return;
 672         if (task->tk_status == 0) {
 673                 switch (data->o_res.f_attr->mode & S_IFMT) {
 674                         case S_IFREG:
 675                                 break;
 676                         case S_IFLNK:
 677                                 data->rpc_status = -ELOOP;
 678                                 break;
 679                         case S_IFDIR:
 680                                 data->rpc_status = -EISDIR;
 681                                 break;
 682                         default:
 683                                 data->rpc_status = -ENOTDIR;
 684                 }
 685                 renew_lease(data->o_res.server, data->timestamp);
 686         }
 687         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 688 }
 689
 690 static void nfs4_open_release(void *calldata)
 691 {
 692         struct nfs4_opendata *data = calldata;
 693         struct nfs4_state *state = NULL;
 694
 695         /* If this request hasn't been cancelled, do nothing */
 696         if (data->cancelled == 0)
 697                 goto out_free;
 698         /* In case of error, no cleanup! */
 699         if (data->rpc_status != 0)
 700                 goto out_free;
 701         /* In case we need an open_confirm, no cleanup! */
 702         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 703                 goto out_free;
 704         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 705         state = nfs4_opendata_to_nfs4_state(data);
 706         if (state != NULL)
 707                 nfs4_close_state(state, data->o_arg.open_flags);
 708 out_free:
 709         nfs4_opendata_free(data);
 710 }
 711
 712 static const struct rpc_call_ops nfs4_open_ops = {
 713         .rpc_call_prepare = nfs4_open_prepare,
 714         .rpc_call_done = nfs4_open_done,
 715         .rpc_release = nfs4_open_release,
 716 };
 717
 718 /*
 719  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 720  */
 721 static int _nfs4_proc_open(struct nfs4_opendata *data)
 722 {
 723         struct inode *dir = data->dir->d_inode;
 724         struct nfs_server *server = NFS_SERVER(dir);
 725         struct nfs_openargs *o_arg = &data->o_arg;
 726         struct nfs_openres *o_res = &data->o_res;
 727         struct rpc_task *task;
 728         int status;
 729
 730         atomic_inc(&data->count);
 731         /*
 732          * If rpc_run_task() ends up calling ->rpc_release(), we
 733          * want to ensure that it takes the 'error' code path.
 734          */
 735         data->rpc_status = -ENOMEM;
 736         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 737         if (IS_ERR(task))
 738                 return PTR_ERR(task);
 739         status = nfs4_wait_for_completion_rpc_task(task);
 740         if (status != 0) {
 741                 data->cancelled = 1;
 742                 smp_wmb();
 743         } else
 744                 status = data->rpc_status;
 745         rpc_put_task(task);
 746         if (status != 0)
 747                 return status;
 748
 749         if (o_arg->open_flags & O_CREAT) {
 750                 update_changeattr(dir, &o_res->cinfo);
 751                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 752         } else
 753                 nfs_refresh_inode(dir, o_res->dir_attr);
 754         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 755                 status = _nfs4_proc_open_confirm(data);
 756                 if (status != 0)
 757                         return status;
 758         }
 759         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 760         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 761                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 762         return 0;
 763 }
 764
 765 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 766 {
 767         struct nfs_access_entry cache;
 768         int mask = 0;
 769         int status;
 770
 771         if (openflags & FMODE_READ)
 772                 mask |= MAY_READ;
 773         if (openflags & FMODE_WRITE)
 774                 mask |= MAY_WRITE;
 775         status = nfs_access_get_cached(inode, cred, &cache);
 776         if (status == 0)
 777                 goto out;
 778
 779         /* Be clever: ask server to check for all possible rights */
 780         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 781         cache.cred = cred;
 782         cache.jiffies = jiffies;
 783         status = _nfs4_proc_access(inode, &cache);
 784         if (status != 0)
 785                 return status;
 786         nfs_access_add_cache(inode, &cache);
 787 out:
 788         if ((cache.mask & mask) == mask)
 789                 return 0;
 790         return -EACCES;
 791 }
 792
 793 int nfs4_recover_expired_lease(struct nfs_server *server)
 794 {
 795         struct nfs_client *clp = server->nfs_client;
 796         int ret;
 797
 798         for (;;) {
 799                 ret = nfs4_wait_clnt_recover(server->client, clp);
 800                 if (ret != 0)
 801                         return ret;
 802                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 803                         break;
 804                 nfs4_schedule_state_recovery(clp);
 805         }
 806         return 0;
 807 }
 808
 809 /*
 810  * OPEN_EXPIRED:
 811  *      reclaim state on the server after a network partition.
 812  *      Assumes caller holds the appropriate lock
 813  */
 814 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 815 {
 816         struct inode *inode = state->inode;
 817         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 818         struct nfs4_opendata *opendata;
 819         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 820         int ret;
 821
 822         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 823                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 824                 if (ret < 0)
 825                         return ret;
 826                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 827                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 828                 return 0;
 829         }
 830         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 831         if (opendata == NULL)
 832                 return -ENOMEM;
 833         ret = nfs4_open_recover(opendata, state);
 834         if (ret == -ESTALE) {
 835                 /* Invalidate the state owner so we don't ever use it again */
 836                 nfs4_drop_state_owner(sp);
 837                 d_drop(dentry);
 838         }
 839         nfs4_opendata_free(opendata);
 840         return ret;
 841 }
 842
 843 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 844 {
 845         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 846         struct nfs4_exception exception = { };
 847         int err;
 848
 849         do {
 850                 err = _nfs4_open_expired(sp, state, dentry);
 851                 if (err == -NFS4ERR_DELAY)
 852                         nfs4_handle_exception(server, err, &exception);
 853         } while (exception.retry);
 854         return err;
 855 }
 856
 857 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 858 {
 859         struct nfs_open_context *ctx;
 860         int ret;
 861
 862         ctx = nfs4_state_find_open_context(state);
 863         if (IS_ERR(ctx))
 864                 return PTR_ERR(ctx);
 865         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 866         put_nfs_open_context(ctx);
 867         return ret;
 868 }
 869
 870 /*
 871  * Returns a referenced nfs4_state if there is an open delegation on the file
 872  */
 873 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 874 {
 875         struct nfs_delegation *delegation;
 876         struct nfs_server *server = NFS_SERVER(inode);
 877         struct nfs_client *clp = server->nfs_client;
 878         struct nfs_inode *nfsi = NFS_I(inode);
 879         struct nfs4_state_owner *sp = NULL;
 880         struct nfs4_state *state = NULL;
 881         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 882         int err;
 883
 884         err = -ENOMEM;
 885         if (!(sp = nfs4_get_state_owner(server, cred))) {
 886                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 887                 return err;
 888         }
 889         err = nfs4_recover_expired_lease(server);
 890         if (err != 0)
 891                 goto out_put_state_owner;
 892         /* Protect against reboot recovery - NOTE ORDER! */
 893         down_read(&clp->cl_sem);
 894         /* Protect against delegation recall */
 895         down_read(&nfsi->rwsem);
 896         delegation = NFS_I(inode)->delegation;
 897         err = -ENOENT;
 898         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 899                 goto out_err;
 900         err = -ENOMEM;
 901         state = nfs4_get_open_state(inode, sp);
 902         if (state == NULL)
 903                 goto out_err;
 904
 905         err = -ENOENT;
 906         if ((state->state & open_flags) == open_flags) {
 907                 spin_lock(&inode->i_lock);
 908                 update_open_stateflags(state, open_flags);
 909                 spin_unlock(&inode->i_lock);
 910                 goto out_ok;
 911         } else if (state->state != 0)
 912                 goto out_put_open_state;
 913
 914         lock_kernel();
 915         err = _nfs4_do_access(inode, cred, open_flags);
 916         unlock_kernel();
 917         if (err != 0)
 918                 goto out_put_open_state;
 919         set_bit(NFS_DELEGATED_STATE, &state->flags);
 920         update_open_stateid(state, &delegation->stateid, open_flags);
 921 out_ok:
 922         nfs4_put_state_owner(sp);
 923         up_read(&nfsi->rwsem);
 924         up_read(&clp->cl_sem);
 925         *res = state;
 926         return 0;
 927 out_put_open_state:
 928         nfs4_put_open_state(state);
 929 out_err:
 930         up_read(&nfsi->rwsem);
 931         up_read(&clp->cl_sem);
 932         if (err != -EACCES)
 933                 nfs_inode_return_delegation(inode);
 934 out_put_state_owner:
 935         nfs4_put_state_owner(sp);
 936         return err;
 937 }
 938
 939 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 940 {
 941         struct nfs4_exception exception = { };
 942         struct nfs4_state *res = ERR_PTR(-EIO);
 943         int err;
 944
 945         do {
 946                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 947                 if (err == 0)
 948                         break;
 949                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 950                                         err, &exception));
 951         } while (exception.retry);
 952         return res;
 953 }
 954
 955 /*
 956  * Returns a referenced nfs4_state
 957  */
 958 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 959 {
 960         struct nfs4_state_owner  *sp;
 961         struct nfs4_state     *state = NULL;
 962         struct nfs_server       *server = NFS_SERVER(dir);
 963         struct nfs_client *clp = server->nfs_client;
 964         struct nfs4_opendata *opendata;
 965         int                     status;
 966
 967         /* Protect against reboot recovery conflicts */
 968         status = -ENOMEM;
 969         if (!(sp = nfs4_get_state_owner(server, cred))) {
 970                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 971                 goto out_err;
 972         }
 973         status = nfs4_recover_expired_lease(server);
 974         if (status != 0)
 975                 goto err_put_state_owner;
 976         down_read(&clp->cl_sem);
 977         status = -ENOMEM;
 978         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 979         if (opendata == NULL)
 980                 goto err_release_rwsem;
 981
 982         status = _nfs4_proc_open(opendata);
 983         if (status != 0)
 984                 goto err_opendata_free;
 985
 986         status = -ENOMEM;
 987         state = nfs4_opendata_to_nfs4_state(opendata);
 988         if (state == NULL)
 989                 goto err_opendata_free;
 990         if (opendata->o_res.delegation_type != 0)
 991                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 992         nfs4_opendata_free(opendata);
 993         nfs4_put_state_owner(sp);
 994         up_read(&clp->cl_sem);
 995         *res = state;
 996         return 0;
 997 err_opendata_free:
 998         nfs4_opendata_free(opendata);
 999 err_release_rwsem:
1000         up_read(&clp->cl_sem);
1001 err_put_state_owner:
1002         nfs4_put_state_owner(sp);
1003 out_err:
1004         *res = NULL;
1005         return status;
1006 }
1007
1008
1009 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1010 {
1011         struct nfs4_exception exception = { };
1012         struct nfs4_state *res;
1013         int status;
1014
1015         do {
1016                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1017                 if (status == 0)
1018                         break;
1019                 /* NOTE: BAD_SEQID means the server and client disagree about the
1020                  * book-keeping w.r.t. state-changing operations
1021                  * (OPEN/CLOSE/LOCK/LOCKU...)
1022                  * It is actually a sign of a bug on the client or on the server.
1023                  *
1024                  * If we receive a BAD_SEQID error in the particular case of
1025                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1026                  * have unhashed the old state_owner for us, and that we can
1027                  * therefore safely retry using a new one. We should still warn
1028                  * the user though...
1029                  */
1030                 if (status == -NFS4ERR_BAD_SEQID) {
1031                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1032                         exception.retry = 1;
1033                         continue;
1034                 }
1035                 /*
1036                  * BAD_STATEID on OPEN means that the server cancelled our
1037                  * state before it received the OPEN_CONFIRM.
1038                  * Recover by retrying the request as per the discussion
1039                  * on Page 181 of RFC3530.
1040                  */
1041                 if (status == -NFS4ERR_BAD_STATEID) {
1042                         exception.retry = 1;
1043                         continue;
1044                 }
1045                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1046                                         status, &exception));
1047         } while (exception.retry);
1048         return res;
1049 }
1050
1051 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1052                 struct iattr *sattr, struct nfs4_state *state)
1053 {
1054         struct nfs_server *server = NFS_SERVER(inode);
1055         struct nfs_setattrargs  arg = {
1056                 .fh             = NFS_FH(inode),
1057                 .iap            = sattr,
1058                 .server         = server,
1059                 .bitmask = server->attr_bitmask,
1060         };
1061         struct nfs_setattrres  res = {
1062                 .fattr          = fattr,
1063                 .server         = server,
1064         };
1065         struct rpc_message msg = {
1066                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1067                 .rpc_argp       = &arg,
1068                 .rpc_resp       = &res,
1069         };
1070         unsigned long timestamp = jiffies;
1071         int status;
1072
1073         nfs_fattr_init(fattr);
1074
1075         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1076                 /* Use that stateid */
1077         } else if (state != NULL) {
1078                 msg.rpc_cred = state->owner->so_cred;
1079                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1080         } else
1081                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1082
1083         status = rpc_call_sync(server->client, &msg, 0);
1084         if (status == 0 && state != NULL)
1085                 renew_lease(server, timestamp);
1086         return status;
1087 }
1088
1089 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1090                 struct iattr *sattr, struct nfs4_state *state)
1091 {
1092         struct nfs_server *server = NFS_SERVER(inode);
1093         struct nfs4_exception exception = { };
1094         int err;
1095         do {
1096                 err = nfs4_handle_exception(server,
1097                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1098                                 &exception);
1099         } while (exception.retry);
1100         return err;
1101 }
1102
1103 struct nfs4_closedata {
1104         struct inode *inode;
1105         struct nfs4_state *state;
1106         struct nfs_closeargs arg;
1107         struct nfs_closeres res;
1108         struct nfs_fattr fattr;
1109         unsigned long timestamp;
1110 };
1111
1112 static void nfs4_free_closedata(void *data)
1113 {
1114         struct nfs4_closedata *calldata = data;
1115         struct nfs4_state_owner *sp = calldata->state->owner;
1116
1117         nfs4_put_open_state(calldata->state);
1118         nfs_free_seqid(calldata->arg.seqid);
1119         nfs4_put_state_owner(sp);
1120         kfree(calldata);
1121 }
1122
1123 static void nfs4_close_done(struct rpc_task *task, void *data)
1124 {
1125         struct nfs4_closedata *calldata = data;
1126         struct nfs4_state *state = calldata->state;
1127         struct nfs_server *server = NFS_SERVER(calldata->inode);
1128
1129         if (RPC_ASSASSINATED(task))
1130                 return;
1131         /* hmm. we are done with the inode, and in the process of freeing
1132          * the state_owner. we keep this around to process errors
1133          */
1134         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1135         switch (task->tk_status) {
1136                 case 0:
1137                         memcpy(&state->stateid, &calldata->res.stateid,
1138                                         sizeof(state->stateid));
1139                         renew_lease(server, calldata->timestamp);
1140                         break;
1141                 case -NFS4ERR_STALE_STATEID:
1142                 case -NFS4ERR_EXPIRED:
1143                         nfs4_schedule_state_recovery(server->nfs_client);
1144                         break;
1145                 default:
1146                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1147                                 rpc_restart_call(task);
1148                                 return;
1149                         }
1150         }
1151         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1152 }
1153
1154 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1155 {
1156         struct nfs4_closedata *calldata = data;
1157         struct nfs4_state *state = calldata->state;
1158         struct rpc_message msg = {
1159                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1160                 .rpc_argp = &calldata->arg,
1161                 .rpc_resp = &calldata->res,
1162                 .rpc_cred = state->owner->so_cred,
1163         };
1164         int mode = 0, old_mode;
1165
1166         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1167                 return;
1168         /* Recalculate the new open mode in case someone reopened the file
1169          * while we were waiting in line to be scheduled.
1170          */
1171         spin_lock(&state->owner->so_lock);
1172         spin_lock(&calldata->inode->i_lock);
1173         mode = old_mode = state->state;
1174         if (state->n_rdwr == 0) {
1175                 if (state->n_rdonly == 0)
1176                         mode &= ~FMODE_READ;
1177                 if (state->n_wronly == 0)
1178                         mode &= ~FMODE_WRITE;
1179         }
1180         nfs4_state_set_mode_locked(state, mode);
1181         spin_unlock(&calldata->inode->i_lock);
1182         spin_unlock(&state->owner->so_lock);
1183         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1184                 /* Note: exit _without_ calling nfs4_close_done */
1185                 task->tk_action = NULL;
1186                 return;
1187         }
1188         nfs_fattr_init(calldata->res.fattr);
1189         if (mode != 0)
1190                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1191         calldata->arg.open_flags = mode;
1192         calldata->timestamp = jiffies;
1193         rpc_call_setup(task, &msg, 0);
1194 }
1195
1196 static const struct rpc_call_ops nfs4_close_ops = {
1197         .rpc_call_prepare = nfs4_close_prepare,
1198         .rpc_call_done = nfs4_close_done,
1199         .rpc_release = nfs4_free_closedata,
1200 };
1201
1202 /*
1203  * It is possible for data to be read/written from a mem-mapped file
1204  * after the sys_close call (which hits the vfs layer as a flush).
1205  * This means that we can't safely call nfsv4 close on a file until
1206  * the inode is cleared. This in turn means that we are not good
1207  * NFSv4 citizens - we do not indicate to the server to update the file's
1208  * share state even when we are done with one of the three share
1209  * stateid's in the inode.
1210  *
1211  * NOTE: Caller must be holding the sp->so_owner semaphore!
1212  */
1213 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1214 {
1215         struct nfs_server *server = NFS_SERVER(inode);
1216         struct nfs4_closedata *calldata;
1217         int status = -ENOMEM;
1218
1219         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1220         if (calldata == NULL)
1221                 goto out;
1222         calldata->inode = inode;
1223         calldata->state = state;
1224         calldata->arg.fh = NFS_FH(inode);
1225         calldata->arg.stateid = &state->stateid;
1226         /* Serialization for the sequence id */
1227         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1228         if (calldata->arg.seqid == NULL)
1229                 goto out_free_calldata;
1230         calldata->arg.bitmask = server->attr_bitmask;
1231         calldata->res.fattr = &calldata->fattr;
1232         calldata->res.server = server;
1233
1234         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1235         if (status == 0)
1236                 goto out;
1237
1238         nfs_free_seqid(calldata->arg.seqid);
1239 out_free_calldata:
1240         kfree(calldata);
1241 out:
1242         return status;
1243 }
1244
1245 static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1246 {
1247         struct file *filp;
1248
1249         filp = lookup_instantiate_filp(nd, dentry, NULL);
1250         if (!IS_ERR(filp)) {
1251                 struct nfs_open_context *ctx;
1252                 ctx = (struct nfs_open_context *)filp->private_data;
1253                 ctx->state = state;
1254                 return 0;
1255         }
1256         nfs4_close_state(state, nd->intent.open.flags);
1257         return PTR_ERR(filp);
1258 }
1259
1260 struct dentry *
1261 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1262 {
1263         struct iattr attr;
1264         struct rpc_cred *cred;
1265         struct nfs4_state *state;
1266         struct dentry *res;
1267
1268         if (nd->flags & LOOKUP_CREATE) {
1269                 attr.ia_mode = nd->intent.open.create_mode;
1270                 attr.ia_valid = ATTR_MODE;
1271                 if (!IS_POSIXACL(dir))
1272                         attr.ia_mode &= ~current->fs->umask;
1273         } else {
1274                 attr.ia_valid = 0;
1275                 BUG_ON(nd->intent.open.flags & O_CREAT);
1276         }
1277
1278         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1279         if (IS_ERR(cred))
1280                 return (struct dentry *)cred;
1281         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1282         put_rpccred(cred);
1283         if (IS_ERR(state)) {
1284                 if (PTR_ERR(state) == -ENOENT)
1285                         d_add(dentry, NULL);
1286                 return (struct dentry *)state;
1287         }
1288         res = d_add_unique(dentry, igrab(state->inode));
1289         if (res != NULL)
1290                 dentry = res;
1291         nfs4_intent_set_file(nd, dentry, state);
1292         return res;
1293 }
1294
1295 int
1296 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1297 {
1298         struct rpc_cred *cred;
1299         struct nfs4_state *state;
1300
1301         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1302         if (IS_ERR(cred))
1303                 return PTR_ERR(cred);
1304         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1305         if (IS_ERR(state))
1306                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1307         put_rpccred(cred);
1308         if (IS_ERR(state)) {
1309                 switch (PTR_ERR(state)) {
1310                         case -EPERM:
1311                         case -EACCES:
1312                         case -EDQUOT:
1313                         case -ENOSPC:
1314                         case -EROFS:
1315                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1316                                 return 1;
1317                         default:
1318                                 goto out_drop;
1319                 }
1320         }
1321         if (state->inode == dentry->d_inode) {
1322                 nfs4_intent_set_file(nd, dentry, state);
1323                 return 1;
1324         }
1325         nfs4_close_state(state, openflags);
1326 out_drop:
1327         d_drop(dentry);
1328         return 0;
1329 }
1330
1331
1332 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1333 {
1334         struct nfs4_server_caps_res res = {};
1335         struct rpc_message msg = {
1336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1337                 .rpc_argp = fhandle,
1338                 .rpc_resp = &res,
1339         };
1340         int status;
1341
1342         status = rpc_call_sync(server->client, &msg, 0);
1343         if (status == 0) {
1344                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1345                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1346                         server->caps |= NFS_CAP_ACLS;
1347                 if (res.has_links != 0)
1348                         server->caps |= NFS_CAP_HARDLINKS;
1349                 if (res.has_symlinks != 0)
1350                         server->caps |= NFS_CAP_SYMLINKS;
1351                 server->acl_bitmask = res.acl_bitmask;
1352         }
1353         return status;
1354 }
1355
1356 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1357 {
1358         struct nfs4_exception exception = { };
1359         int err;
1360         do {
1361                 err = nfs4_handle_exception(server,
1362                                 _nfs4_server_capabilities(server, fhandle),
1363                                 &exception);
1364         } while (exception.retry);
1365         return err;
1366 }
1367
1368 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1369                 struct nfs_fsinfo *info)
1370 {
1371         struct nfs4_lookup_root_arg args = {
1372                 .bitmask = nfs4_fattr_bitmap,
1373         };
1374         struct nfs4_lookup_res res = {
1375                 .server = server,
1376                 .fattr = info->fattr,
1377                 .fh = fhandle,
1378         };
1379         struct rpc_message msg = {
1380                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1381                 .rpc_argp = &args,
1382                 .rpc_resp = &res,
1383         };
1384         nfs_fattr_init(info->fattr);
1385         return rpc_call_sync(server->client, &msg, 0);
1386 }
1387
1388 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1389                 struct nfs_fsinfo *info)
1390 {
1391         struct nfs4_exception exception = { };
1392         int err;
1393         do {
1394                 err = nfs4_handle_exception(server,
1395                                 _nfs4_lookup_root(server, fhandle, info),
1396                                 &exception);
1397         } while (exception.retry);
1398         return err;
1399 }
1400
1401 /*
1402  * get the file handle for the "/" directory on the server
1403  */
1404 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1405                               struct nfs_fsinfo *info)
1406 {
1407         int status;
1408
1409         status = nfs4_lookup_root(server, fhandle, info);
1410         if (status == 0)
1411                 status = nfs4_server_capabilities(server, fhandle);
1412         if (status == 0)
1413                 status = nfs4_do_fsinfo(server, fhandle, info);
1414         return nfs4_map_errors(status);
1415 }
1416
1417 /*
1418  * Get locations and (maybe) other attributes of a referral.
1419  * Note that we'll actually follow the referral later when
1420  * we detect fsid mismatch in inode revalidation
1421  */
1422 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1423 {
1424         int status = -ENOMEM;
1425         struct page *page = NULL;
1426         struct nfs4_fs_locations *locations = NULL;
1427
1428         page = alloc_page(GFP_KERNEL);
1429         if (page == NULL)
1430                 goto out;
1431         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1432         if (locations == NULL)
1433                 goto out;
1434
1435         status = nfs4_proc_fs_locations(dir, name, locations, page);
1436         if (status != 0)
1437                 goto out;
1438         /* Make sure server returned a different fsid for the referral */
1439         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1440                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1441                 status = -EIO;
1442                 goto out;
1443         }
1444
1445         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1446         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1447         if (!fattr->mode)
1448                 fattr->mode = S_IFDIR;
1449         memset(fhandle, 0, sizeof(struct nfs_fh));
1450 out:
1451         if (page)
1452                 __free_page(page);
1453         if (locations)
1454                 kfree(locations);
1455         return status;
1456 }
1457
1458 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1459 {
1460         struct nfs4_getattr_arg args = {
1461                 .fh = fhandle,
1462                 .bitmask = server->attr_bitmask,
1463         };
1464         struct nfs4_getattr_res res = {
1465                 .fattr = fattr,
1466                 .server = server,
1467         };
1468         struct rpc_message msg = {
1469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1470                 .rpc_argp = &args,
1471                 .rpc_resp = &res,
1472         };
1473
1474         nfs_fattr_init(fattr);
1475         return rpc_call_sync(server->client, &msg, 0);
1476 }
1477
1478 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1479 {
1480         struct nfs4_exception exception = { };
1481         int err;
1482         do {
1483                 err = nfs4_handle_exception(server,
1484                                 _nfs4_proc_getattr(server, fhandle, fattr),
1485                                 &exception);
1486         } while (exception.retry);
1487         return err;
1488 }
1489
1490 /*
1491  * The file is not closed if it is opened due to the a request to change
1492  * the size of the file. The open call will not be needed once the
1493  * VFS layer lookup-intents are implemented.
1494  *
1495  * Close is called when the inode is destroyed.
1496  * If we haven't opened the file for O_WRONLY, we
1497  * need to in the size_change case to obtain a stateid.
1498  *
1499  * Got race?
1500  * Because OPEN is always done by name in nfsv4, it is
1501  * possible that we opened a different file by the same
1502  * name.  We can recognize this race condition, but we
1503  * can't do anything about it besides returning an error.
1504  *
1505  * This will be fixed with VFS changes (lookup-intent).
1506  */
1507 static int
1508 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1509                   struct iattr *sattr)
1510 {
1511         struct rpc_cred *cred;
1512         struct inode *inode = dentry->d_inode;
1513         struct nfs_open_context *ctx;
1514         struct nfs4_state *state = NULL;
1515         int status;
1516
1517         nfs_fattr_init(fattr);
1518
1519         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1520         if (IS_ERR(cred))
1521                 return PTR_ERR(cred);
1522
1523         /* Search for an existing open(O_WRITE) file */
1524         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1525         if (ctx != NULL)
1526                 state = ctx->state;
1527
1528         status = nfs4_do_setattr(inode, fattr, sattr, state);
1529         if (status == 0)
1530                 nfs_setattr_update_inode(inode, sattr);
1531         if (ctx != NULL)
1532                 put_nfs_open_context(ctx);
1533         put_rpccred(cred);
1534         return status;
1535 }
1536
1537 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1538                 struct qstr *name, struct nfs_fh *fhandle,
1539                 struct nfs_fattr *fattr)
1540 {
1541         int                    status;
1542         struct nfs4_lookup_arg args = {
1543                 .bitmask = server->attr_bitmask,
1544                 .dir_fh = dirfh,
1545                 .name = name,
1546         };
1547         struct nfs4_lookup_res res = {
1548                 .server = server,
1549                 .fattr = fattr,
1550                 .fh = fhandle,
1551         };
1552         struct rpc_message msg = {
1553                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1554                 .rpc_argp = &args,
1555                 .rpc_resp = &res,
1556         };
1557
1558         nfs_fattr_init(fattr);
1559
1560         dprintk("NFS call  lookupfh %s\n", name->name);
1561         status = rpc_call_sync(server->client, &msg, 0);
1562         dprintk("NFS reply lookupfh: %d\n", status);
1563         if (status == -NFS4ERR_MOVED)
1564                 status = -EREMOTE;
1565         return status;
1566 }
1567
1568 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1569                               struct qstr *name, struct nfs_fh *fhandle,
1570                               struct nfs_fattr *fattr)
1571 {
1572         struct nfs4_exception exception = { };
1573         int err;
1574         do {
1575                 err = nfs4_handle_exception(server,
1576                                 _nfs4_proc_lookupfh(server, dirfh, name,
1577                                                     fhandle, fattr),
1578                                 &exception);
1579         } while (exception.retry);
1580         return err;
1581 }
1582
1583 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1584                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1585 {
1586         int                    status;
1587         struct nfs_server *server = NFS_SERVER(dir);
1588         struct nfs4_lookup_arg args = {
1589                 .bitmask = server->attr_bitmask,
1590                 .dir_fh = NFS_FH(dir),
1591                 .name = name,
1592         };
1593         struct nfs4_lookup_res res = {
1594                 .server = server,
1595                 .fattr = fattr,
1596                 .fh = fhandle,
1597         };
1598         struct rpc_message msg = {
1599                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1600                 .rpc_argp = &args,
1601                 .rpc_resp = &res,
1602         };
1603
1604         nfs_fattr_init(fattr);
1605
1606         dprintk("NFS call  lookup %s\n", name->name);
1607         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1608         if (status == -NFS4ERR_MOVED)
1609                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1610         dprintk("NFS reply lookup: %d\n", status);
1611         return status;
1612 }
1613
1614 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1615 {
1616         struct nfs4_exception exception = { };
1617         int err;
1618         do {
1619                 err = nfs4_handle_exception(NFS_SERVER(dir),
1620                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1621                                 &exception);
1622         } while (exception.retry);
1623         return err;
1624 }
1625
1626 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1627 {
1628         struct nfs4_accessargs args = {
1629                 .fh = NFS_FH(inode),
1630         };
1631         struct nfs4_accessres res = { 0 };
1632         struct rpc_message msg = {
1633                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1634                 .rpc_argp = &args,
1635                 .rpc_resp = &res,
1636                 .rpc_cred = entry->cred,
1637         };
1638         int mode = entry->mask;
1639         int status;
1640
1641         /*
1642          * Determine which access bits we want to ask for...
1643          */
1644         if (mode & MAY_READ)
1645                 args.access |= NFS4_ACCESS_READ;
1646         if (S_ISDIR(inode->i_mode)) {
1647                 if (mode & MAY_WRITE)
1648                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1649                 if (mode & MAY_EXEC)
1650                         args.access |= NFS4_ACCESS_LOOKUP;
1651         } else {
1652                 if (mode & MAY_WRITE)
1653                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1654                 if (mode & MAY_EXEC)
1655                         args.access |= NFS4_ACCESS_EXECUTE;
1656         }
1657         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1658         if (!status) {
1659                 entry->mask = 0;
1660                 if (res.access & NFS4_ACCESS_READ)
1661                         entry->mask |= MAY_READ;
1662                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1663                         entry->mask |= MAY_WRITE;
1664                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1665                         entry->mask |= MAY_EXEC;
1666         }
1667         return status;
1668 }
1669
1670 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1671 {
1672         struct nfs4_exception exception = { };
1673         int err;
1674         do {
1675                 err = nfs4_handle_exception(NFS_SERVER(inode),
1676                                 _nfs4_proc_access(inode, entry),
1677                                 &exception);
1678         } while (exception.retry);
1679         return err;
1680 }
1681
1682 /*
1683  * TODO: For the time being, we don't try to get any attributes
1684  * along with any of the zero-copy operations READ, READDIR,
1685  * READLINK, WRITE.
1686  *
1687  * In the case of the first three, we want to put the GETATTR
1688  * after the read-type operation -- this is because it is hard
1689  * to predict the length of a GETATTR response in v4, and thus
1690  * align the READ data correctly.  This means that the GETATTR
1691  * may end up partially falling into the page cache, and we should
1692  * shift it into the 'tail' of the xdr_buf before processing.
1693  * To do this efficiently, we need to know the total length
1694  * of data received, which doesn't seem to be available outside
1695  * of the RPC layer.
1696  *
1697  * In the case of WRITE, we also want to put the GETATTR after
1698  * the operation -- in this case because we want to make sure
1699  * we get the post-operation mtime and size.  This means that
1700  * we can't use xdr_encode_pages() as written: we need a variant
1701  * of it which would leave room in the 'tail' iovec.
1702  *
1703  * Both of these changes to the XDR layer would in fact be quite
1704  * minor, but I decided to leave them for a subsequent patch.
1705  */
1706 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1707                 unsigned int pgbase, unsigned int pglen)
1708 {
1709         struct nfs4_readlink args = {
1710                 .fh       = NFS_FH(inode),
1711                 .pgbase   = pgbase,
1712                 .pglen    = pglen,
1713                 .pages    = &page,
1714         };
1715         struct rpc_message msg = {
1716                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1717                 .rpc_argp = &args,
1718                 .rpc_resp = NULL,
1719         };
1720
1721         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1722 }
1723
1724 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1725                 unsigned int pgbase, unsigned int pglen)
1726 {
1727         struct nfs4_exception exception = { };
1728         int err;
1729         do {
1730                 err = nfs4_handle_exception(NFS_SERVER(inode),
1731                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1732                                 &exception);
1733         } while (exception.retry);
1734         return err;
1735 }
1736
1737 /*
1738  * Got race?
1739  * We will need to arrange for the VFS layer to provide an atomic open.
1740  * Until then, this create/open method is prone to inefficiency and race
1741  * conditions due to the lookup, create, and open VFS calls from sys_open()
1742  * placed on the wire.
1743  *
1744  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1745  * The file will be opened again in the subsequent VFS open call
1746  * (nfs4_proc_file_open).
1747  *
1748  * The open for read will just hang around to be used by any process that
1749  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1750  */
1751
1752 static int
1753 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1754                  int flags, struct nameidata *nd)
1755 {
1756         struct nfs4_state *state;
1757         struct rpc_cred *cred;
1758         int status = 0;
1759
1760         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1761         if (IS_ERR(cred)) {
1762                 status = PTR_ERR(cred);
1763                 goto out;
1764         }
1765         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1766         put_rpccred(cred);
1767         if (IS_ERR(state)) {
1768                 status = PTR_ERR(state);
1769                 goto out;
1770         }
1771         d_instantiate(dentry, igrab(state->inode));
1772         if (flags & O_EXCL) {
1773                 struct nfs_fattr fattr;
1774                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1775                 if (status == 0)
1776                         nfs_setattr_update_inode(state->inode, sattr);
1777         }
1778         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1779                 status = nfs4_intent_set_file(nd, dentry, state);
1780         else
1781                 nfs4_close_state(state, flags);
1782 out:
1783         return status;
1784 }
1785
1786 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1787 {
1788         struct nfs_server *server = NFS_SERVER(dir);
1789         struct nfs4_remove_arg args = {
1790                 .fh = NFS_FH(dir),
1791                 .name = name,
1792                 .bitmask = server->attr_bitmask,
1793         };
1794         struct nfs_fattr dir_attr;
1795         struct nfs4_remove_res  res = {
1796                 .server = server,
1797                 .dir_attr = &dir_attr,
1798         };
1799         struct rpc_message msg = {
1800                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1801                 .rpc_argp       = &args,
1802                 .rpc_resp       = &res,
1803         };
1804         int                     status;
1805
1806         nfs_fattr_init(res.dir_attr);
1807         status = rpc_call_sync(server->client, &msg, 0);
1808         if (status == 0) {
1809                 update_changeattr(dir, &res.cinfo);
1810                 nfs_post_op_update_inode(dir, res.dir_attr);
1811         }
1812         return status;
1813 }
1814
1815 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1816 {
1817         struct nfs4_exception exception = { };
1818         int err;
1819         do {
1820                 err = nfs4_handle_exception(NFS_SERVER(dir),
1821                                 _nfs4_proc_remove(dir, name),
1822                                 &exception);
1823         } while (exception.retry);
1824         return err;
1825 }
1826
1827 struct unlink_desc {
1828         struct nfs4_remove_arg  args;
1829         struct nfs4_remove_res  res;
1830         struct nfs_fattr dir_attr;
1831 };
1832
1833 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1834                 struct qstr *name)
1835 {
1836         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1837         struct unlink_desc *up;
1838
1839         up = kmalloc(sizeof(*up), GFP_KERNEL);
1840         if (!up)
1841                 return -ENOMEM;
1842
1843         up->args.fh = NFS_FH(dir->d_inode);
1844         up->args.name = name;
1845         up->args.bitmask = server->attr_bitmask;
1846         up->res.server = server;
1847         up->res.dir_attr = &up->dir_attr;
1848
1849         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1850         msg->rpc_argp = &up->args;
1851         msg->rpc_resp = &up->res;
1852         return 0;
1853 }
1854
1855 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1856 {
1857         struct rpc_message *msg = &task->tk_msg;
1858         struct unlink_desc *up;
1859
1860         if (msg->rpc_resp != NULL) {
1861                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1862                 update_changeattr(dir->d_inode, &up->res.cinfo);
1863                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1864                 kfree(up);
1865                 msg->rpc_resp = NULL;
1866                 msg->rpc_argp = NULL;
1867         }
1868         return 0;
1869 }
1870
1871 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1872                 struct inode *new_dir, struct qstr *new_name)
1873 {
1874         struct nfs_server *server = NFS_SERVER(old_dir);
1875         struct nfs4_rename_arg arg = {
1876                 .old_dir = NFS_FH(old_dir),
1877                 .new_dir = NFS_FH(new_dir),
1878                 .old_name = old_name,
1879                 .new_name = new_name,
1880                 .bitmask = server->attr_bitmask,
1881         };
1882         struct nfs_fattr old_fattr, new_fattr;
1883         struct nfs4_rename_res res = {
1884                 .server = server,
1885                 .old_fattr = &old_fattr,
1886                 .new_fattr = &new_fattr,
1887         };
1888         struct rpc_message msg = {
1889                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1890                 .rpc_argp = &arg,
1891                 .rpc_resp = &res,
1892         };
1893         int                     status;
1894
1895         nfs_fattr_init(res.old_fattr);
1896         nfs_fattr_init(res.new_fattr);
1897         status = rpc_call_sync(server->client, &msg, 0);
1898
1899         if (!status) {
1900                 update_changeattr(old_dir, &res.old_cinfo);
1901                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1902                 update_changeattr(new_dir, &res.new_cinfo);
1903                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1904         }
1905         return status;
1906 }
1907
1908 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1909                 struct inode *new_dir, struct qstr *new_name)
1910 {
1911         struct nfs4_exception exception = { };
1912         int err;
1913         do {
1914                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1915                                 _nfs4_proc_rename(old_dir, old_name,
1916                                         new_dir, new_name),
1917                                 &exception);
1918         } while (exception.retry);
1919         return err;
1920 }
1921
1922 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1923 {
1924         struct nfs_server *server = NFS_SERVER(inode);
1925         struct nfs4_link_arg arg = {
1926                 .fh     = NFS_FH(inode),
1927                 .dir_fh = NFS_FH(dir),
1928                 .name   = name,
1929                 .bitmask = server->attr_bitmask,
1930         };
1931         struct nfs_fattr fattr, dir_attr;
1932         struct nfs4_link_res res = {
1933                 .server = server,
1934                 .fattr = &fattr,
1935                 .dir_attr = &dir_attr,
1936         };
1937         struct rpc_message msg = {
1938                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1939                 .rpc_argp = &arg,
1940                 .rpc_resp = &res,
1941         };
1942         int                     status;
1943
1944         nfs_fattr_init(res.fattr);
1945         nfs_fattr_init(res.dir_attr);
1946         status = rpc_call_sync(server->client, &msg, 0);
1947         if (!status) {
1948                 update_changeattr(dir, &res.cinfo);
1949                 nfs_post_op_update_inode(dir, res.dir_attr);
1950                 nfs_post_op_update_inode(inode, res.fattr);
1951         }
1952
1953         return status;
1954 }
1955
1956 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1957 {
1958         struct nfs4_exception exception = { };
1959         int err;
1960         do {
1961                 err = nfs4_handle_exception(NFS_SERVER(inode),
1962                                 _nfs4_proc_link(inode, dir, name),
1963                                 &exception);
1964         } while (exception.retry);
1965         return err;
1966 }
1967
1968 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
1969                 struct page *page, unsigned int len, struct iattr *sattr)
1970 {
1971         struct nfs_server *server = NFS_SERVER(dir);
1972         struct nfs_fh fhandle;
1973         struct nfs_fattr fattr, dir_fattr;
1974         struct nfs4_create_arg arg = {
1975                 .dir_fh = NFS_FH(dir),
1976                 .server = server,
1977                 .name = &dentry->d_name,
1978                 .attrs = sattr,
1979                 .ftype = NF4LNK,
1980                 .bitmask = server->attr_bitmask,
1981         };
1982         struct nfs4_create_res res = {
1983                 .server = server,
1984                 .fh = &fhandle,
1985                 .fattr = &fattr,
1986                 .dir_fattr = &dir_fattr,
1987         };
1988         struct rpc_message msg = {
1989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1990                 .rpc_argp = &arg,
1991                 .rpc_resp = &res,
1992         };
1993         int                     status;
1994
1995         if (len > NFS4_MAXPATHLEN)
1996                 return -ENAMETOOLONG;
1997
1998         arg.u.symlink.pages = &page;
1999         arg.u.symlink.len = len;
2000         nfs_fattr_init(&fattr);
2001         nfs_fattr_init(&dir_fattr);
2002
2003         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2004         if (!status) {
2005                 update_changeattr(dir, &res.dir_cinfo);
2006                 nfs_post_op_update_inode(dir, res.dir_fattr);
2007                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2008         }
2009         return status;
2010 }
2011
2012 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2013                 struct page *page, unsigned int len, struct iattr *sattr)
2014 {
2015         struct nfs4_exception exception = { };
2016         int err;
2017         do {
2018                 err = nfs4_handle_exception(NFS_SERVER(dir),
2019                                 _nfs4_proc_symlink(dir, dentry, page,
2020                                                         len, sattr),
2021                                 &exception);
2022         } while (exception.retry);
2023         return err;
2024 }
2025
2026 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2027                 struct iattr *sattr)
2028 {
2029         struct nfs_server *server = NFS_SERVER(dir);
2030         struct nfs_fh fhandle;
2031         struct nfs_fattr fattr, dir_fattr;
2032         struct nfs4_create_arg arg = {
2033                 .dir_fh = NFS_FH(dir),
2034                 .server = server,
2035                 .name = &dentry->d_name,
2036                 .attrs = sattr,
2037                 .ftype = NF4DIR,
2038                 .bitmask = server->attr_bitmask,
2039         };
2040         struct nfs4_create_res res = {
2041                 .server = server,
2042                 .fh = &fhandle,
2043                 .fattr = &fattr,
2044                 .dir_fattr = &dir_fattr,
2045         };
2046         struct rpc_message msg = {
2047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2048                 .rpc_argp = &arg,
2049                 .rpc_resp = &res,
2050         };
2051         int                     status;
2052
2053         nfs_fattr_init(&fattr);
2054         nfs_fattr_init(&dir_fattr);
2055
2056         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2057         if (!status) {
2058                 update_changeattr(dir, &res.dir_cinfo);
2059                 nfs_post_op_update_inode(dir, res.dir_fattr);
2060                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2061         }
2062         return status;
2063 }
2064
2065 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2066                 struct iattr *sattr)
2067 {
2068         struct nfs4_exception exception = { };
2069         int err;
2070         do {
2071                 err = nfs4_handle_exception(NFS_SERVER(dir),
2072                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2073                                 &exception);
2074         } while (exception.retry);
2075         return err;
2076 }
2077
2078 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2079                   u64 cookie, struct page *page, unsigned int count, int plus)
2080 {
2081         struct inode            *dir = dentry->d_inode;
2082         struct nfs4_readdir_arg args = {
2083                 .fh = NFS_FH(dir),
2084                 .pages = &page,
2085                 .pgbase = 0,
2086                 .count = count,
2087                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2088         };
2089         struct nfs4_readdir_res res;
2090         struct rpc_message msg = {
2091                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2092                 .rpc_argp = &args,
2093                 .rpc_resp = &res,
2094                 .rpc_cred = cred,
2095         };
2096         int                     status;
2097
2098         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2099                         dentry->d_parent->d_name.name,
2100                         dentry->d_name.name,
2101                         (unsigned long long)cookie);
2102         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2103         res.pgbase = args.pgbase;
2104         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2105         if (status == 0)
2106                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2107         dprintk("%s: returns %d\n", __FUNCTION__, status);
2108         return status;
2109 }
2110
2111 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2112                   u64 cookie, struct page *page, unsigned int count, int plus)
2113 {
2114         struct nfs4_exception exception = { };
2115         int err;
2116         do {
2117                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2118                                 _nfs4_proc_readdir(dentry, cred, cookie,
2119                                         page, count, plus),
2120                                 &exception);
2121         } while (exception.retry);
2122         return err;
2123 }
2124
2125 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2126                 struct iattr *sattr, dev_t rdev)
2127 {
2128         struct nfs_server *server = NFS_SERVER(dir);
2129         struct nfs_fh fh;
2130         struct nfs_fattr fattr, dir_fattr;
2131         struct nfs4_create_arg arg = {
2132                 .dir_fh = NFS_FH(dir),
2133                 .server = server,
2134                 .name = &dentry->d_name,
2135                 .attrs = sattr,
2136                 .bitmask = server->attr_bitmask,
2137         };
2138         struct nfs4_create_res res = {
2139                 .server = server,
2140                 .fh = &fh,
2141                 .fattr = &fattr,
2142                 .dir_fattr = &dir_fattr,
2143         };
2144         struct rpc_message msg = {
2145                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2146                 .rpc_argp = &arg,
2147                 .rpc_resp = &res,
2148         };
2149         int                     status;
2150         int                     mode = sattr->ia_mode;
2151
2152         nfs_fattr_init(&fattr);
2153         nfs_fattr_init(&dir_fattr);
2154
2155         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2156         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2157         if (S_ISFIFO(mode))
2158                 arg.ftype = NF4FIFO;
2159         else if (S_ISBLK(mode)) {
2160                 arg.ftype = NF4BLK;
2161                 arg.u.device.specdata1 = MAJOR(rdev);
2162                 arg.u.device.specdata2 = MINOR(rdev);
2163         }
2164         else if (S_ISCHR(mode)) {
2165                 arg.ftype = NF4CHR;
2166                 arg.u.device.specdata1 = MAJOR(rdev);
2167                 arg.u.device.specdata2 = MINOR(rdev);
2168         }
2169         else
2170                 arg.ftype = NF4SOCK;
2171
2172         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2173         if (status == 0) {
2174                 update_changeattr(dir, &res.dir_cinfo);
2175                 nfs_post_op_update_inode(dir, res.dir_fattr);
2176                 status = nfs_instantiate(dentry, &fh, &fattr);
2177         }
2178         return status;
2179 }
2180
2181 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2182                 struct iattr *sattr, dev_t rdev)
2183 {
2184         struct nfs4_exception exception = { };
2185         int err;
2186         do {
2187                 err = nfs4_handle_exception(NFS_SERVER(dir),
2188                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2189                                 &exception);
2190         } while (exception.retry);
2191         return err;
2192 }
2193
2194 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2195                  struct nfs_fsstat *fsstat)
2196 {
2197         struct nfs4_statfs_arg args = {
2198                 .fh = fhandle,
2199                 .bitmask = server->attr_bitmask,
2200         };
2201         struct rpc_message msg = {
2202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2203                 .rpc_argp = &args,
2204                 .rpc_resp = fsstat,
2205         };
2206
2207         nfs_fattr_init(fsstat->fattr);
2208         return rpc_call_sync(server->client, &msg, 0);
2209 }
2210
2211 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2212 {
2213         struct nfs4_exception exception = { };
2214         int err;
2215         do {
2216                 err = nfs4_handle_exception(server,
2217                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2218                                 &exception);
2219         } while (exception.retry);
2220         return err;
2221 }
2222
2223 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2224                 struct nfs_fsinfo *fsinfo)
2225 {
2226         struct nfs4_fsinfo_arg args = {
2227                 .fh = fhandle,
2228                 .bitmask = server->attr_bitmask,
2229         };
2230         struct rpc_message msg = {
2231                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2232                 .rpc_argp = &args,
2233                 .rpc_resp = fsinfo,
2234         };
2235
2236         return rpc_call_sync(server->client, &msg, 0);
2237 }
2238
2239 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2240 {
2241         struct nfs4_exception exception = { };
2242         int err;
2243
2244         do {
2245                 err = nfs4_handle_exception(server,
2246                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2247                                 &exception);
2248         } while (exception.retry);
2249         return err;
2250 }
2251
2252 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2253 {
2254         nfs_fattr_init(fsinfo->fattr);
2255         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2256 }
2257
2258 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2259                 struct nfs_pathconf *pathconf)
2260 {
2261         struct nfs4_pathconf_arg args = {
2262                 .fh = fhandle,
2263                 .bitmask = server->attr_bitmask,
2264         };
2265         struct rpc_message msg = {
2266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2267                 .rpc_argp = &args,
2268                 .rpc_resp = pathconf,
2269         };
2270
2271         /* None of the pathconf attributes are mandatory to implement */
2272         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2273                 memset(pathconf, 0, sizeof(*pathconf));
2274                 return 0;
2275         }
2276
2277         nfs_fattr_init(pathconf->fattr);
2278         return rpc_call_sync(server->client, &msg, 0);
2279 }
2280
2281 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2282                 struct nfs_pathconf *pathconf)
2283 {
2284         struct nfs4_exception exception = { };
2285         int err;
2286
2287         do {
2288                 err = nfs4_handle_exception(server,
2289                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2290                                 &exception);
2291         } while (exception.retry);
2292         return err;
2293 }
2294
2295 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2296 {
2297         struct nfs_server *server = NFS_SERVER(data->inode);
2298
2299         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2300                 rpc_restart_call(task);
2301                 return -EAGAIN;
2302         }
2303         if (task->tk_status > 0)
2304                 renew_lease(server, data->timestamp);
2305         return 0;
2306 }
2307
2308 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2309 {
2310         struct rpc_message msg = {
2311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2312                 .rpc_argp = &data->args,
2313                 .rpc_resp = &data->res,
2314                 .rpc_cred = data->cred,
2315         };
2316
2317         data->timestamp   = jiffies;
2318
2319         rpc_call_setup(&data->task, &msg, 0);
2320 }
2321
2322 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2323 {
2324         struct inode *inode = data->inode;
2325
2326         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2327                 rpc_restart_call(task);
2328                 return -EAGAIN;
2329         }
2330         if (task->tk_status >= 0) {
2331                 renew_lease(NFS_SERVER(inode), data->timestamp);
2332                 nfs_post_op_update_inode(inode, data->res.fattr);
2333         }
2334         return 0;
2335 }
2336
2337 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2338 {
2339         struct rpc_message msg = {
2340                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2341                 .rpc_argp = &data->args,
2342                 .rpc_resp = &data->res,
2343                 .rpc_cred = data->cred,
2344         };
2345         struct inode *inode = data->inode;
2346         struct nfs_server *server = NFS_SERVER(inode);
2347         int stable;
2348
2349         if (how & FLUSH_STABLE) {
2350                 if (!NFS_I(inode)->ncommit)
2351                         stable = NFS_FILE_SYNC;
2352                 else
2353                         stable = NFS_DATA_SYNC;
2354         } else
2355                 stable = NFS_UNSTABLE;
2356         data->args.stable = stable;
2357         data->args.bitmask = server->attr_bitmask;
2358         data->res.server = server;
2359
2360         data->timestamp   = jiffies;
2361
2362         /* Finalize the task. */
2363         rpc_call_setup(&data->task, &msg, 0);
2364 }
2365
2366 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2367 {
2368         struct inode *inode = data->inode;
2369
2370         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2371                 rpc_restart_call(task);
2372                 return -EAGAIN;
2373         }
2374         if (task->tk_status >= 0)
2375                 nfs_post_op_update_inode(inode, data->res.fattr);
2376         return 0;
2377 }
2378
2379 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2380 {
2381         struct rpc_message msg = {
2382                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2383                 .rpc_argp = &data->args,
2384                 .rpc_resp = &data->res,
2385                 .rpc_cred = data->cred,
2386         };
2387         struct nfs_server *server = NFS_SERVER(data->inode);
2388
2389         data->args.bitmask = server->attr_bitmask;
2390         data->res.server = server;
2391
2392         rpc_call_setup(&data->task, &msg, 0);
2393 }
2394
2395 /*
2396  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2397  * standalone procedure for queueing an asynchronous RENEW.
2398  */
2399 static void nfs4_renew_done(struct rpc_task *task, void *data)
2400 {
2401         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2402         unsigned long timestamp = (unsigned long)data;
2403
2404         if (task->tk_status < 0) {
2405                 switch (task->tk_status) {
2406                         case -NFS4ERR_STALE_CLIENTID:
2407                         case -NFS4ERR_EXPIRED:
2408                         case -NFS4ERR_CB_PATH_DOWN:
2409                                 nfs4_schedule_state_recovery(clp);
2410                 }
2411                 return;
2412         }
2413         spin_lock(&clp->cl_lock);
2414         if (time_before(clp->cl_last_renewal,timestamp))
2415                 clp->cl_last_renewal = timestamp;
2416         spin_unlock(&clp->cl_lock);
2417 }
2418
2419 static const struct rpc_call_ops nfs4_renew_ops = {
2420         .rpc_call_done = nfs4_renew_done,
2421 };
2422
2423 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2424 {
2425         struct rpc_message msg = {
2426                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2427                 .rpc_argp       = clp,
2428                 .rpc_cred       = cred,
2429         };
2430
2431         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2432                         &nfs4_renew_ops, (void *)jiffies);
2433 }
2434
2435 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2436 {
2437         struct rpc_message msg = {
2438                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2439                 .rpc_argp       = clp,
2440                 .rpc_cred       = cred,
2441         };
2442         unsigned long now = jiffies;
2443         int status;
2444
2445         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2446         if (status < 0)
2447                 return status;
2448         spin_lock(&clp->cl_lock);
2449         if (time_before(clp->cl_last_renewal,now))
2450                 clp->cl_last_renewal = now;
2451         spin_unlock(&clp->cl_lock);
2452         return 0;
2453 }
2454
2455 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2456 {
2457         return (server->caps & NFS_CAP_ACLS)
2458                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2459                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2460 }
2461
2462 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2463  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2464  * the stack.
2465  */
2466 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2467
2468 static void buf_to_pages(const void *buf, size_t buflen,
2469                 struct page **pages, unsigned int *pgbase)
2470 {
2471         const void *p = buf;
2472
2473         *pgbase = offset_in_page(buf);
2474         p -= *pgbase;
2475         while (p < buf + buflen) {
2476                 *(pages++) = virt_to_page(p);
2477                 p += PAGE_CACHE_SIZE;
2478         }
2479 }
2480
2481 struct nfs4_cached_acl {
2482         int cached;
2483         size_t len;
2484         char data[0];
2485 };
2486
2487 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2488 {
2489         struct nfs_inode *nfsi = NFS_I(inode);
2490
2491         spin_lock(&inode->i_lock);
2492         kfree(nfsi->nfs4_acl);
2493         nfsi->nfs4_acl = acl;
2494         spin_unlock(&inode->i_lock);
2495 }
2496
2497 static void nfs4_zap_acl_attr(struct inode *inode)
2498 {
2499         nfs4_set_cached_acl(inode, NULL);
2500 }
2501
2502 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2503 {
2504         struct nfs_inode *nfsi = NFS_I(inode);
2505         struct nfs4_cached_acl *acl;
2506         int ret = -ENOENT;
2507
2508         spin_lock(&inode->i_lock);
2509         acl = nfsi->nfs4_acl;
2510         if (acl == NULL)
2511                 goto out;
2512         if (buf == NULL) /* user is just asking for length */
2513                 goto out_len;
2514         if (acl->cached == 0)
2515                 goto out;
2516         ret = -ERANGE; /* see getxattr(2) man page */
2517         if (acl->len > buflen)
2518                 goto out;
2519         memcpy(buf, acl->data, acl->len);
2520 out_len:
2521         ret = acl->len;
2522 out:
2523         spin_unlock(&inode->i_lock);
2524         return ret;
2525 }
2526
2527 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2528 {
2529         struct nfs4_cached_acl *acl;
2530
2531         if (buf && acl_len <= PAGE_SIZE) {
2532                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2533                 if (acl == NULL)
2534                         goto out;
2535                 acl->cached = 1;
2536                 memcpy(acl->data, buf, acl_len);
2537         } else {
2538                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2539                 if (acl == NULL)
2540                         goto out;
2541                 acl->cached = 0;
2542         }
2543         acl->len = acl_len;
2544 out:
2545         nfs4_set_cached_acl(inode, acl);
2546 }
2547
2548 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2549 {
2550         struct page *pages[NFS4ACL_MAXPAGES];
2551         struct nfs_getaclargs args = {
2552                 .fh = NFS_FH(inode),
2553                 .acl_pages = pages,
2554                 .acl_len = buflen,
2555         };
2556         size_t resp_len = buflen;
2557         void *resp_buf;
2558         struct rpc_message msg = {
2559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2560                 .rpc_argp = &args,
2561                 .rpc_resp = &resp_len,
2562         };
2563         struct page *localpage = NULL;
2564         int ret;
2565
2566         if (buflen < PAGE_SIZE) {
2567                 /* As long as we're doing a round trip to the server anyway,
2568                  * let's be prepared for a page of acl data. */
2569                 localpage = alloc_page(GFP_KERNEL);
2570                 resp_buf = page_address(localpage);
2571                 if (localpage == NULL)
2572                         return -ENOMEM;
2573                 args.acl_pages[0] = localpage;
2574                 args.acl_pgbase = 0;
2575                 resp_len = args.acl_len = PAGE_SIZE;
2576         } else {
2577                 resp_buf = buf;
2578                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2579         }
2580         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2581         if (ret)
2582                 goto out_free;
2583         if (resp_len > args.acl_len)
2584                 nfs4_write_cached_acl(inode, NULL, resp_len);
2585         else
2586                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2587         if (buf) {
2588                 ret = -ERANGE;
2589                 if (resp_len > buflen)
2590                         goto out_free;
2591                 if (localpage)
2592                         memcpy(buf, resp_buf, resp_len);
2593         }
2594         ret = resp_len;
2595 out_free:
2596         if (localpage)
2597                 __free_page(localpage);
2598         return ret;
2599 }
2600
2601 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2602 {
2603         struct nfs4_exception exception = { };
2604         ssize_t ret;
2605         do {
2606                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2607                 if (ret >= 0)
2608                         break;
2609                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2610         } while (exception.retry);
2611         return ret;
2612 }
2613
2614 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2615 {
2616         struct nfs_server *server = NFS_SERVER(inode);
2617         int ret;
2618
2619         if (!nfs4_server_supports_acls(server))
2620                 return -EOPNOTSUPP;
2621         ret = nfs_revalidate_inode(server, inode);
2622         if (ret < 0)
2623                 return ret;
2624         ret = nfs4_read_cached_acl(inode, buf, buflen);
2625         if (ret != -ENOENT)
2626                 return ret;
2627         return nfs4_get_acl_uncached(inode, buf, buflen);
2628 }
2629
2630 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2631 {
2632         struct nfs_server *server = NFS_SERVER(inode);
2633         struct page *pages[NFS4ACL_MAXPAGES];
2634         struct nfs_setaclargs arg = {
2635                 .fh             = NFS_FH(inode),
2636                 .acl_pages      = pages,
2637                 .acl_len        = buflen,
2638         };
2639         struct rpc_message msg = {
2640                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2641                 .rpc_argp       = &arg,
2642                 .rpc_resp       = NULL,
2643         };
2644         int ret;
2645
2646         if (!nfs4_server_supports_acls(server))
2647                 return -EOPNOTSUPP;
2648         nfs_inode_return_delegation(inode);
2649         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2650         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2651         if (ret == 0)
2652                 nfs4_write_cached_acl(inode, buf, buflen);
2653         return ret;
2654 }
2655
2656 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2657 {
2658         struct nfs4_exception exception = { };
2659         int err;
2660         do {
2661                 err = nfs4_handle_exception(NFS_SERVER(inode),
2662                                 __nfs4_proc_set_acl(inode, buf, buflen),
2663                                 &exception);
2664         } while (exception.retry);
2665         return err;
2666 }
2667
2668 static int
2669 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2670 {
2671         struct nfs_client *clp = server->nfs_client;
2672
2673         if (!clp || task->tk_status >= 0)
2674                 return 0;
2675         switch(task->tk_status) {
2676                 case -NFS4ERR_STALE_CLIENTID:
2677                 case -NFS4ERR_STALE_STATEID:
2678                 case -NFS4ERR_EXPIRED:
2679                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2680                         nfs4_schedule_state_recovery(clp);
2681                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2682                                 rpc_wake_up_task(task);
2683                         task->tk_status = 0;
2684                         return -EAGAIN;
2685                 case -NFS4ERR_DELAY:
2686                         nfs_inc_server_stats((struct nfs_server *) server,
2687                                                 NFSIOS_DELAY);
2688                 case -NFS4ERR_GRACE:
2689                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2690                         task->tk_status = 0;
2691                         return -EAGAIN;
2692                 case -NFS4ERR_OLD_STATEID:
2693                         task->tk_status = 0;
2694                         return -EAGAIN;
2695         }
2696         task->tk_status = nfs4_map_errors(task->tk_status);
2697         return 0;
2698 }
2699
2700 static int nfs4_wait_bit_interruptible(void *word)
2701 {
2702         if (signal_pending(current))
2703                 return -ERESTARTSYS;
2704         schedule();
2705         return 0;
2706 }
2707
2708 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2709 {
2710         sigset_t oldset;
2711         int res;
2712
2713         might_sleep();
2714
2715         rpc_clnt_sigmask(clnt, &oldset);
2716         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2717                         nfs4_wait_bit_interruptible,
2718                         TASK_INTERRUPTIBLE);
2719         rpc_clnt_sigunmask(clnt, &oldset);
2720         return res;
2721 }
2722
2723 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2724 {
2725         sigset_t oldset;
2726         int res = 0;
2727
2728         might_sleep();
2729
2730         if (*timeout <= 0)
2731                 *timeout = NFS4_POLL_RETRY_MIN;
2732         if (*timeout > NFS4_POLL_RETRY_MAX)
2733                 *timeout = NFS4_POLL_RETRY_MAX;
2734         rpc_clnt_sigmask(clnt, &oldset);
2735         if (clnt->cl_intr) {
2736                 schedule_timeout_interruptible(*timeout);
2737                 if (signalled())
2738                         res = -ERESTARTSYS;
2739         } else
2740                 schedule_timeout_uninterruptible(*timeout);
2741         rpc_clnt_sigunmask(clnt, &oldset);
2742         *timeout <<= 1;
2743         return res;
2744 }
2745
2746 /* This is the error handling routine for processes that are allowed
2747  * to sleep.
2748  */
2749 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2750 {
2751         struct nfs_client *clp = server->nfs_client;
2752         int ret = errorcode;
2753
2754         exception->retry = 0;
2755         switch(errorcode) {
2756                 case 0:
2757                         return 0;
2758                 case -NFS4ERR_STALE_CLIENTID:
2759                 case -NFS4ERR_STALE_STATEID:
2760                 case -NFS4ERR_EXPIRED:
2761                         nfs4_schedule_state_recovery(clp);
2762                         ret = nfs4_wait_clnt_recover(server->client, clp);
2763                         if (ret == 0)
2764                                 exception->retry = 1;
2765                         break;
2766                 case -NFS4ERR_FILE_OPEN:
2767                 case -NFS4ERR_GRACE:
2768                 case -NFS4ERR_DELAY:
2769                         ret = nfs4_delay(server->client, &exception->timeout);
2770                         if (ret != 0)
2771                                 break;
2772                 case -NFS4ERR_OLD_STATEID:
2773                         exception->retry = 1;
2774         }
2775         /* We failed to handle the error */
2776         return nfs4_map_errors(ret);
2777 }
2778
2779 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2780 {
2781         nfs4_verifier sc_verifier;
2782         struct nfs4_setclientid setclientid = {
2783                 .sc_verifier = &sc_verifier,
2784                 .sc_prog = program,
2785         };
2786         struct rpc_message msg = {
2787                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2788                 .rpc_argp = &setclientid,
2789                 .rpc_resp = clp,
2790                 .rpc_cred = cred,
2791         };
2792         __be32 *p;
2793         int loop = 0;
2794         int status;
2795
2796         p = (__be32*)sc_verifier.data;
2797         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2798         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2799
2800         for(;;) {
2801                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2802                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2803                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2804                                 cred->cr_ops->cr_name,
2805                                 clp->cl_id_uniquifier);
2806                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2807                                 sizeof(setclientid.sc_netid), "tcp");
2808                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2809                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2810                                 clp->cl_ipaddr, port >> 8, port & 255);
2811
2812                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2813                 if (status != -NFS4ERR_CLID_INUSE)
2814                         break;
2815                 if (signalled())
2816                         break;
2817                 if (loop++ & 1)
2818                         ssleep(clp->cl_lease_time + 1);
2819                 else
2820                         if (++clp->cl_id_uniquifier == 0)
2821                                 break;
2822         }
2823         return status;
2824 }
2825
2826 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2827 {
2828         struct nfs_fsinfo fsinfo;
2829         struct rpc_message msg = {
2830                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2831                 .rpc_argp = clp,
2832                 .rpc_resp = &fsinfo,
2833                 .rpc_cred = cred,
2834         };
2835         unsigned long now;
2836         int status;
2837
2838         now = jiffies;
2839         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2840         if (status == 0) {
2841                 spin_lock(&clp->cl_lock);
2842                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2843                 clp->cl_last_renewal = now;
2844                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2845                 spin_unlock(&clp->cl_lock);
2846         }
2847         return status;
2848 }
2849
2850 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2851 {
2852         long timeout;
2853         int err;
2854         do {
2855                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2856                 switch (err) {
2857                         case 0:
2858                                 return err;
2859                         case -NFS4ERR_RESOURCE:
2860                                 /* The IBM lawyers misread another document! */
2861                         case -NFS4ERR_DELAY:
2862                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2863                 }
2864         } while (err == 0);
2865         return err;
2866 }
2867
2868 struct nfs4_delegreturndata {
2869         struct nfs4_delegreturnargs args;
2870         struct nfs4_delegreturnres res;
2871         struct nfs_fh fh;
2872         nfs4_stateid stateid;
2873         struct rpc_cred *cred;
2874         unsigned long timestamp;
2875         struct nfs_fattr fattr;
2876         int rpc_status;
2877 };
2878
2879 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2880 {
2881         struct nfs4_delegreturndata *data = calldata;
2882         struct rpc_message msg = {
2883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2884                 .rpc_argp = &data->args,
2885                 .rpc_resp = &data->res,
2886                 .rpc_cred = data->cred,
2887         };
2888         nfs_fattr_init(data->res.fattr);
2889         rpc_call_setup(task, &msg, 0);
2890 }
2891
2892 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2893 {
2894         struct nfs4_delegreturndata *data = calldata;
2895         data->rpc_status = task->tk_status;
2896         if (data->rpc_status == 0)
2897                 renew_lease(data->res.server, data->timestamp);
2898 }
2899
2900 static void nfs4_delegreturn_release(void *calldata)
2901 {
2902         struct nfs4_delegreturndata *data = calldata;
2903
2904         put_rpccred(data->cred);
2905         kfree(calldata);
2906 }
2907
2908 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2909         .rpc_call_prepare = nfs4_delegreturn_prepare,
2910         .rpc_call_done = nfs4_delegreturn_done,
2911         .rpc_release = nfs4_delegreturn_release,
2912 };
2913
2914 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2915 {
2916         struct nfs4_delegreturndata *data;
2917         struct nfs_server *server = NFS_SERVER(inode);
2918         struct rpc_task *task;
2919         int status;
2920
2921         data = kmalloc(sizeof(*data), GFP_KERNEL);
2922         if (data == NULL)
2923                 return -ENOMEM;
2924         data->args.fhandle = &data->fh;
2925         data->args.stateid = &data->stateid;
2926         data->args.bitmask = server->attr_bitmask;
2927         nfs_copy_fh(&data->fh, NFS_FH(inode));
2928         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2929         data->res.fattr = &data->fattr;
2930         data->res.server = server;
2931         data->cred = get_rpccred(cred);
2932         data->timestamp = jiffies;
2933         data->rpc_status = 0;
2934
2935         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2936         if (IS_ERR(task))
2937                 return PTR_ERR(task);
2938         status = nfs4_wait_for_completion_rpc_task(task);
2939         if (status == 0) {
2940                 status = data->rpc_status;
2941                 if (status == 0)
2942                         nfs_post_op_update_inode(inode, &data->fattr);
2943         }
2944         rpc_put_task(task);
2945         return status;
2946 }
2947
2948 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2949 {
2950         struct nfs_server *server = NFS_SERVER(inode);
2951         struct nfs4_exception exception = { };
2952         int err;
2953         do {
2954                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2955                 switch (err) {
2956                         case -NFS4ERR_STALE_STATEID:
2957                         case -NFS4ERR_EXPIRED:
2958                                 nfs4_schedule_state_recovery(server->nfs_client);
2959                         case 0:
2960                                 return 0;
2961                 }
2962                 err = nfs4_handle_exception(server, err, &exception);
2963         } while (exception.retry);
2964         return err;
2965 }
2966
2967 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2968 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2969
2970 /*
2971  * sleep, with exponential backoff, and retry the LOCK operation.
2972  */
2973 static unsigned long
2974 nfs4_set_lock_task_retry(unsigned long timeout)
2975 {
2976         schedule_timeout_interruptible(timeout);
2977         timeout <<= 1;
2978         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2979                 return NFS4_LOCK_MAXTIMEOUT;
2980         return timeout;
2981 }
2982
2983 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2984 {
2985         struct inode *inode = state->inode;
2986         struct nfs_server *server = NFS_SERVER(inode);
2987         struct nfs_client *clp = server->nfs_client;
2988         struct nfs_lockt_args arg = {
2989                 .fh = NFS_FH(inode),
2990                 .fl = request,
2991         };
2992         struct nfs_lockt_res res = {
2993                 .denied = request,
2994         };
2995         struct rpc_message msg = {
2996                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2997                 .rpc_argp       = &arg,
2998                 .rpc_resp       = &res,
2999                 .rpc_cred       = state->owner->so_cred,
3000         };
3001         struct nfs4_lock_state *lsp;
3002         int status;
3003
3004         down_read(&clp->cl_sem);
3005         arg.lock_owner.clientid = clp->cl_clientid;
3006         status = nfs4_set_lock_state(state, request);
3007         if (status != 0)
3008                 goto out;
3009         lsp = request->fl_u.nfs4_fl.owner;
3010         arg.lock_owner.id = lsp->ls_id;
3011         status = rpc_call_sync(server->client, &msg, 0);
3012         switch (status) {
3013                 case 0:
3014                         request->fl_type = F_UNLCK;
3015                         break;
3016                 case -NFS4ERR_DENIED:
3017                         status = 0;
3018         }
3019 out:
3020         up_read(&clp->cl_sem);
3021         return status;
3022 }
3023
3024 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3025 {
3026         struct nfs4_exception exception = { };
3027         int err;
3028
3029         do {
3030                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3031                                 _nfs4_proc_getlk(state, cmd, request),
3032                                 &exception);
3033         } while (exception.retry);
3034         return err;
3035 }
3036
3037 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3038 {
3039         int res = 0;
3040         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3041                 case FL_POSIX:
3042                         res = posix_lock_file_wait(file, fl);
3043                         break;
3044                 case FL_FLOCK:
3045                         res = flock_lock_file_wait(file, fl);
3046                         break;
3047                 default:
3048                         BUG();
3049         }
3050         return res;
3051 }
3052
3053 struct nfs4_unlockdata {
3054         struct nfs_locku_args arg;
3055         struct nfs_locku_res res;
3056         struct nfs4_lock_state *lsp;
3057         struct nfs_open_context *ctx;
3058         struct file_lock fl;
3059         const struct nfs_server *server;
3060         unsigned long timestamp;
3061 };
3062
3063 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3064                 struct nfs_open_context *ctx,
3065                 struct nfs4_lock_state *lsp,
3066                 struct nfs_seqid *seqid)
3067 {
3068         struct nfs4_unlockdata *p;
3069         struct inode *inode = lsp->ls_state->inode;
3070
3071         p = kmalloc(sizeof(*p), GFP_KERNEL);
3072         if (p == NULL)
3073                 return NULL;
3074         p->arg.fh = NFS_FH(inode);
3075         p->arg.fl = &p->fl;
3076         p->arg.seqid = seqid;
3077         p->arg.stateid = &lsp->ls_stateid;
3078         p->lsp = lsp;
3079         atomic_inc(&lsp->ls_count);
3080         /* Ensure we don't close file until we're done freeing locks! */
3081         p->ctx = get_nfs_open_context(ctx);
3082         memcpy(&p->fl, fl, sizeof(p->fl));
3083         p->server = NFS_SERVER(inode);
3084         return p;
3085 }
3086
3087 static void nfs4_locku_release_calldata(void *data)
3088 {
3089         struct nfs4_unlockdata *calldata = data;
3090         nfs_free_seqid(calldata->arg.seqid);
3091         nfs4_put_lock_state(calldata->lsp);
3092         put_nfs_open_context(calldata->ctx);
3093         kfree(calldata);
3094 }
3095
3096 static void nfs4_locku_done(struct rpc_task *task, void *data)
3097 {
3098         struct nfs4_unlockdata *calldata = data;
3099
3100         if (RPC_ASSASSINATED(task))
3101                 return;
3102         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3103         switch (task->tk_status) {
3104                 case 0:
3105                         memcpy(calldata->lsp->ls_stateid.data,
3106                                         calldata->res.stateid.data,
3107                                         sizeof(calldata->lsp->ls_stateid.data));
3108                         renew_lease(calldata->server, calldata->timestamp);
3109                         break;
3110                 case -NFS4ERR_STALE_STATEID:
3111                 case -NFS4ERR_EXPIRED:
3112                         nfs4_schedule_state_recovery(calldata->server->nfs_client);
3113                         break;
3114                 default:
3115                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3116                                 rpc_restart_call(task);
3117                         }
3118         }
3119 }
3120
3121 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3122 {
3123         struct nfs4_unlockdata *calldata = data;
3124         struct rpc_message msg = {
3125                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3126                 .rpc_argp       = &calldata->arg,
3127                 .rpc_resp       = &calldata->res,
3128                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3129         };
3130
3131         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3132                 return;
3133         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3134                 /* Note: exit _without_ running nfs4_locku_done */
3135                 task->tk_action = NULL;
3136                 return;
3137         }
3138         calldata->timestamp = jiffies;
3139         rpc_call_setup(task, &msg, 0);
3140 }
3141
3142 static const struct rpc_call_ops nfs4_locku_ops = {
3143         .rpc_call_prepare = nfs4_locku_prepare,
3144         .rpc_call_done = nfs4_locku_done,
3145         .rpc_release = nfs4_locku_release_calldata,
3146 };
3147
3148 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3149                 struct nfs_open_context *ctx,
3150                 struct nfs4_lock_state *lsp,
3151                 struct nfs_seqid *seqid)
3152 {
3153         struct nfs4_unlockdata *data;
3154
3155         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3156         if (data == NULL) {
3157                 nfs_free_seqid(seqid);
3158                 return ERR_PTR(-ENOMEM);
3159         }
3160
3161         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3162 }
3163
3164 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3165 {
3166         struct nfs_seqid *seqid;
3167         struct nfs4_lock_state *lsp;
3168         struct rpc_task *task;
3169         int status = 0;
3170
3171         status = nfs4_set_lock_state(state, request);
3172         /* Unlock _before_ we do the RPC call */
3173         request->fl_flags |= FL_EXISTS;
3174         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3175                 goto out;
3176         if (status != 0)
3177                 goto out;
3178         /* Is this a delegated lock? */
3179         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3180                 goto out;
3181         lsp = request->fl_u.nfs4_fl.owner;
3182         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3183         status = -ENOMEM;
3184         if (seqid == NULL)
3185                 goto out;
3186         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3187         status = PTR_ERR(task);
3188         if (IS_ERR(task))
3189                 goto out;
3190         status = nfs4_wait_for_completion_rpc_task(task);
3191         rpc_put_task(task);
3192 out:
3193         return status;
3194 }
3195
3196 struct nfs4_lockdata {
3197         struct nfs_lock_args arg;
3198         struct nfs_lock_res res;
3199         struct nfs4_lock_state *lsp;
3200         struct nfs_open_context *ctx;
3201         struct file_lock fl;
3202         unsigned long timestamp;
3203         int rpc_status;
3204         int cancelled;
3205 };
3206
3207 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3208                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3209 {
3210         struct nfs4_lockdata *p;
3211         struct inode *inode = lsp->ls_state->inode;
3212         struct nfs_server *server = NFS_SERVER(inode);
3213
3214         p = kzalloc(sizeof(*p), GFP_KERNEL);
3215         if (p == NULL)
3216                 return NULL;
3217
3218         p->arg.fh = NFS_FH(inode);
3219         p->arg.fl = &p->fl;
3220         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3221         if (p->arg.lock_seqid == NULL)
3222                 goto out_free;
3223         p->arg.lock_stateid = &lsp->ls_stateid;
3224         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3225         p->arg.lock_owner.id = lsp->ls_id;
3226         p->lsp = lsp;
3227         atomic_inc(&lsp->ls_count);
3228         p->ctx = get_nfs_open_context(ctx);
3229         memcpy(&p->fl, fl, sizeof(p->fl));
3230         return p;
3231 out_free:
3232         kfree(p);
3233         return NULL;
3234 }
3235
3236 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3237 {
3238         struct nfs4_lockdata *data = calldata;
3239         struct nfs4_state *state = data->lsp->ls_state;
3240         struct nfs4_state_owner *sp = state->owner;
3241         struct rpc_message msg = {
3242                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3243                 .rpc_argp = &data->arg,
3244                 .rpc_resp = &data->res,
3245                 .rpc_cred = sp->so_cred,
3246         };
3247
3248         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3249                 return;
3250         dprintk("%s: begin!\n", __FUNCTION__);
3251         /* Do we need to do an open_to_lock_owner? */
3252         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3253                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3254                 if (data->arg.open_seqid == NULL) {
3255                         data->rpc_status = -ENOMEM;
3256                         task->tk_action = NULL;
3257                         goto out;
3258                 }
3259                 data->arg.open_stateid = &state->stateid;
3260                 data->arg.new_lock_owner = 1;
3261         }
3262         data->timestamp = jiffies;
3263         rpc_call_setup(task, &msg, 0);
3264 out:
3265         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3266 }
3267
3268 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3269 {
3270         struct nfs4_lockdata *data = calldata;
3271
3272         dprintk("%s: begin!\n", __FUNCTION__);
3273
3274         data->rpc_status = task->tk_status;
3275         if (RPC_ASSASSINATED(task))
3276                 goto out;
3277         if (data->arg.new_lock_owner != 0) {
3278                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3279                 if (data->rpc_status == 0)
3280                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3281                 else
3282                         goto out;
3283         }
3284         if (data->rpc_status == 0) {
3285                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3286                                         sizeof(data->lsp->ls_stateid.data));
3287                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3288                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3289         }
3290         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3291 out:
3292         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3293 }
3294
3295 static void nfs4_lock_release(void *calldata)
3296 {
3297         struct nfs4_lockdata *data = calldata;
3298
3299         dprintk("%s: begin!\n", __FUNCTION__);
3300         if (data->arg.open_seqid != NULL)
3301                 nfs_free_seqid(data->arg.open_seqid);
3302         if (data->cancelled != 0) {
3303                 struct rpc_task *task;
3304                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3305                                 data->arg.lock_seqid);
3306                 if (!IS_ERR(task))
3307                         rpc_put_task(task);
3308                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3309         } else
3310                 nfs_free_seqid(data->arg.lock_seqid);
3311         nfs4_put_lock_state(data->lsp);
3312         put_nfs_open_context(data->ctx);
3313         kfree(data);
3314         dprintk("%s: done!\n", __FUNCTION__);
3315 }
3316
3317 static const struct rpc_call_ops nfs4_lock_ops = {
3318         .rpc_call_prepare = nfs4_lock_prepare,
3319         .rpc_call_done = nfs4_lock_done,
3320         .rpc_release = nfs4_lock_release,
3321 };
3322
3323 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3324 {
3325         struct nfs4_lockdata *data;
3326         struct rpc_task *task;
3327         int ret;
3328
3329         dprintk("%s: begin!\n", __FUNCTION__);
3330         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3331                         fl->fl_u.nfs4_fl.owner);
3332         if (data == NULL)
3333                 return -ENOMEM;
3334         if (IS_SETLKW(cmd))
3335                 data->arg.block = 1;
3336         if (reclaim != 0)
3337                 data->arg.reclaim = 1;
3338         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3339                         &nfs4_lock_ops, data);
3340         if (IS_ERR(task))
3341                 return PTR_ERR(task);
3342         ret = nfs4_wait_for_completion_rpc_task(task);
3343         if (ret == 0) {
3344                 ret = data->rpc_status;
3345                 if (ret == -NFS4ERR_DENIED)
3346                         ret = -EAGAIN;
3347         } else
3348                 data->cancelled = 1;
3349         rpc_put_task(task);
3350         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3351         return ret;
3352 }
3353
3354 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3355 {
3356         struct nfs_server *server = NFS_SERVER(state->inode);
3357         struct nfs4_exception exception = { };
3358         int err;
3359
3360         do {
3361                 /* Cache the lock if possible... */
3362                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3363                         return 0;
3364                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3365                 if (err != -NFS4ERR_DELAY)
3366                         break;
3367                 nfs4_handle_exception(server, err, &exception);
3368         } while (exception.retry);
3369         return err;
3370 }
3371
3372 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3373 {
3374         struct nfs_server *server = NFS_SERVER(state->inode);
3375         struct nfs4_exception exception = { };
3376         int err;
3377
3378         err = nfs4_set_lock_state(state, request);
3379         if (err != 0)
3380                 return err;
3381         do {
3382                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3383                         return 0;
3384                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3385                 if (err != -NFS4ERR_DELAY)
3386                         break;
3387                 nfs4_handle_exception(server, err, &exception);
3388         } while (exception.retry);
3389         return err;
3390 }
3391
3392 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3393 {
3394         struct nfs_client *clp = state->owner->so_client;
3395         unsigned char fl_flags = request->fl_flags;
3396         int status;
3397
3398         /* Is this a delegated open? */
3399         status = nfs4_set_lock_state(state, request);
3400         if (status != 0)
3401                 goto out;
3402         request->fl_flags |= FL_ACCESS;
3403         status = do_vfs_lock(request->fl_file, request);
3404         if (status < 0)
3405                 goto out;
3406         down_read(&clp->cl_sem);
3407         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3408                 struct nfs_inode *nfsi = NFS_I(state->inode);
3409                 /* Yes: cache locks! */
3410                 down_read(&nfsi->rwsem);
3411                 /* ...but avoid races with delegation recall... */
3412                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3413                         request->fl_flags = fl_flags & ~FL_SLEEP;
3414                         status = do_vfs_lock(request->fl_file, request);
3415                         up_read(&nfsi->rwsem);
3416                         goto out_unlock;
3417                 }
3418                 up_read(&nfsi->rwsem);
3419         }
3420         status = _nfs4_do_setlk(state, cmd, request, 0);
3421         if (status != 0)
3422                 goto out_unlock;
3423         /* Note: we always want to sleep here! */
3424         request->fl_flags = fl_flags | FL_SLEEP;
3425         if (do_vfs_lock(request->fl_file, request) < 0)
3426                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3427 out_unlock:
3428         up_read(&clp->cl_sem);
3429 out:
3430         request->fl_flags = fl_flags;
3431         return status;
3432 }
3433
3434 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3435 {
3436         struct nfs4_exception exception = { };
3437         int err;
3438
3439         do {
3440                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3441                                 _nfs4_proc_setlk(state, cmd, request),
3442                                 &exception);
3443         } while (exception.retry);
3444         return err;
3445 }
3446
3447 static int
3448 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3449 {
3450         struct nfs_open_context *ctx;
3451         struct nfs4_state *state;
3452         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3453         int status;
3454
3455         /* verify open state */
3456         ctx = (struct nfs_open_context *)filp->private_data;
3457         state = ctx->state;
3458
3459         if (request->fl_start < 0 || request->fl_end < 0)
3460                 return -EINVAL;
3461
3462         if (IS_GETLK(cmd))
3463                 return nfs4_proc_getlk(state, F_GETLK, request);
3464
3465         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3466                 return -EINVAL;
3467
3468         if (request->fl_type == F_UNLCK)
3469                 return nfs4_proc_unlck(state, cmd, request);
3470
3471         do {
3472                 status = nfs4_proc_setlk(state, cmd, request);
3473                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3474                         break;
3475                 timeout = nfs4_set_lock_task_retry(timeout);
3476                 status = -ERESTARTSYS;
3477                 if (signalled())
3478                         break;
3479         } while(status < 0);
3480         return status;
3481 }
3482
3483 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3484 {
3485         struct nfs_server *server = NFS_SERVER(state->inode);
3486         struct nfs4_exception exception = { };
3487         int err;
3488
3489         err = nfs4_set_lock_state(state, fl);
3490         if (err != 0)
3491                 goto out;
3492         do {
3493                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3494                 if (err != -NFS4ERR_DELAY)
3495                         break;
3496                 err = nfs4_handle_exception(server, err, &exception);
3497         } while (exception.retry);
3498 out:
3499         return err;
3500 }
3501
3502 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3503
3504 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3505                 size_t buflen, int flags)
3506 {
3507         struct inode *inode = dentry->d_inode;
3508
3509         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3510                 return -EOPNOTSUPP;
3511
3512         if (!S_ISREG(inode->i_mode) &&
3513             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3514                 return -EPERM;
3515
3516         return nfs4_proc_set_acl(inode, buf, buflen);
3517 }
3518
3519 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3520  * and that's what we'll do for e.g. user attributes that haven't been set.
3521  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3522  * attributes in kernel-managed attribute namespaces. */
3523 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3524                 size_t buflen)
3525 {
3526         struct inode *inode = dentry->d_inode;
3527
3528         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3529                 return -EOPNOTSUPP;
3530
3531         return nfs4_proc_get_acl(inode, buf, buflen);
3532 }
3533
3534 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3535 {
3536         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3537
3538         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3539                 return 0;
3540         if (buf && buflen < len)
3541                 return -ERANGE;
3542         if (buf)
3543                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3544         return len;
3545 }
3546
3547 int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3548                 struct nfs4_fs_locations *fs_locations, struct page *page)
3549 {
3550         struct nfs_server *server = NFS_SERVER(dir);
3551         u32 bitmask[2] = {
3552                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3553                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3554         };
3555         struct nfs4_fs_locations_arg args = {
3556                 .dir_fh = NFS_FH(dir),
3557                 .name = name,
3558                 .page = page,
3559                 .bitmask = bitmask,
3560         };
3561         struct rpc_message msg = {
3562                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3563                 .rpc_argp = &args,
3564                 .rpc_resp = fs_locations,
3565         };
3566         int status;
3567
3568         dprintk("%s: start\n", __FUNCTION__);
3569         nfs_fattr_init(&fs_locations->fattr);
3570         fs_locations->server = server;
3571         fs_locations->nlocations = 0;
3572         status = rpc_call_sync(server->client, &msg, 0);
3573         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3574         return status;
3575 }
3576
3577 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3578         .recover_open   = nfs4_open_reclaim,
3579         .recover_lock   = nfs4_lock_reclaim,
3580 };
3581
3582 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3583         .recover_open   = nfs4_open_expired,
3584         .recover_lock   = nfs4_lock_expired,
3585 };
3586
3587 static struct inode_operations nfs4_file_inode_operations = {
3588         .permission     = nfs_permission,
3589         .getattr        = nfs_getattr,
3590         .setattr        = nfs_setattr,
3591         .getxattr       = nfs4_getxattr,
3592         .setxattr       = nfs4_setxattr,
3593         .listxattr      = nfs4_listxattr,
3594 };
3595
3596 const struct nfs_rpc_ops nfs_v4_clientops = {
3597         .version        = 4,                    /* protocol version */
3598         .dentry_ops     = &nfs4_dentry_operations,
3599         .dir_inode_ops  = &nfs4_dir_inode_operations,
3600         .file_inode_ops = &nfs4_file_inode_operations,
3601         .getroot        = nfs4_proc_get_root,
3602         .getattr        = nfs4_proc_getattr,
3603         .setattr        = nfs4_proc_setattr,
3604         .lookupfh       = nfs4_proc_lookupfh,
3605         .lookup         = nfs4_proc_lookup,
3606         .access         = nfs4_proc_access,
3607         .readlink       = nfs4_proc_readlink,
3608         .create         = nfs4_proc_create,
3609         .remove         = nfs4_proc_remove,
3610         .unlink_setup   = nfs4_proc_unlink_setup,
3611         .unlink_done    = nfs4_proc_unlink_done,
3612         .rename         = nfs4_proc_rename,
3613         .link           = nfs4_proc_link,
3614         .symlink        = nfs4_proc_symlink,
3615         .mkdir          = nfs4_proc_mkdir,
3616         .rmdir          = nfs4_proc_remove,
3617         .readdir        = nfs4_proc_readdir,
3618         .mknod          = nfs4_proc_mknod,
3619         .statfs         = nfs4_proc_statfs,
3620         .fsinfo         = nfs4_proc_fsinfo,
3621         .pathconf       = nfs4_proc_pathconf,
3622         .set_capabilities = nfs4_server_capabilities,
3623         .decode_dirent  = nfs4_decode_dirent,
3624         .read_setup     = nfs4_proc_read_setup,
3625         .read_done      = nfs4_read_done,
3626         .write_setup    = nfs4_proc_write_setup,
3627         .write_done     = nfs4_write_done,
3628         .commit_setup   = nfs4_proc_commit_setup,
3629         .commit_done    = nfs4_commit_done,
3630         .file_open      = nfs_open,
3631         .file_release   = nfs_release,
3632         .lock           = nfs4_proc_lock,
3633         .clear_acl_cache = nfs4_zap_acl_attr,
3634 };
3635
3636 /*
3637  * Local variables:
3638  *  c-basic-offset: 8
3639  * End:
3640  */