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_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 212         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 213                 nfs_force_lookup_revalidate(dir);
 214         nfsi->change_attr = cinfo->after;
 215         spin_unlock(&dir->i_lock);
 216 }
 217
 218 struct nfs4_opendata {
 219         struct kref kref;
 220         struct nfs_openargs o_arg;
 221         struct nfs_openres o_res;
 222         struct nfs_open_confirmargs c_arg;
 223         struct nfs_open_confirmres c_res;
 224         struct nfs_fattr f_attr;
 225         struct nfs_fattr dir_attr;
 226         struct path path;
 227         struct dentry *dir;
 228         struct nfs4_state_owner *owner;
 229         struct nfs4_state *state;
 230         struct iattr attrs;
 231         unsigned long timestamp;
 232         unsigned int rpc_done : 1;
 233         int rpc_status;
 234         int cancelled;
 235 };
 236
 237
 238 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 239 {
 240         p->o_res.f_attr = &p->f_attr;
 241         p->o_res.dir_attr = &p->dir_attr;
 242         p->o_res.server = p->o_arg.server;
 243         nfs_fattr_init(&p->f_attr);
 244         nfs_fattr_init(&p->dir_attr);
 245 }
 246
 247 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 248                 struct nfs4_state_owner *sp, int flags,
 249                 const struct iattr *attrs)
 250 {
 251         struct dentry *parent = dget_parent(path->dentry);
 252         struct inode *dir = parent->d_inode;
 253         struct nfs_server *server = NFS_SERVER(dir);
 254         struct nfs4_opendata *p;
 255
 256         p = kzalloc(sizeof(*p), GFP_KERNEL);
 257         if (p == NULL)
 258                 goto err;
 259         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 260         if (p->o_arg.seqid == NULL)
 261                 goto err_free;
 262         p->path.mnt = mntget(path->mnt);
 263         p->path.dentry = dget(path->dentry);
 264         p->dir = parent;
 265         p->owner = sp;
 266         atomic_inc(&sp->so_count);
 267         p->o_arg.fh = NFS_FH(dir);
 268         p->o_arg.open_flags = flags,
 269         p->o_arg.clientid = server->nfs_client->cl_clientid;
 270         p->o_arg.id = sp->so_owner_id.id;
 271         p->o_arg.name = &p->path.dentry->d_name;
 272         p->o_arg.server = server;
 273         p->o_arg.bitmask = server->attr_bitmask;
 274         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 275         if (flags & O_EXCL) {
 276                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 277                 s[0] = jiffies;
 278                 s[1] = current->pid;
 279         } else if (flags & O_CREAT) {
 280                 p->o_arg.u.attrs = &p->attrs;
 281                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 282         }
 283         p->c_arg.fh = &p->o_res.fh;
 284         p->c_arg.stateid = &p->o_res.stateid;
 285         p->c_arg.seqid = p->o_arg.seqid;
 286         nfs4_init_opendata_res(p);
 287         kref_init(&p->kref);
 288         return p;
 289 err_free:
 290         kfree(p);
 291 err:
 292         dput(parent);
 293         return NULL;
 294 }
 295
 296 static void nfs4_opendata_free(struct kref *kref)
 297 {
 298         struct nfs4_opendata *p = container_of(kref,
 299                         struct nfs4_opendata, kref);
 300
 301         nfs_free_seqid(p->o_arg.seqid);
 302         if (p->state != NULL)
 303                 nfs4_put_open_state(p->state);
 304         nfs4_put_state_owner(p->owner);
 305         dput(p->dir);
 306         dput(p->path.dentry);
 307         mntput(p->path.mnt);
 308         kfree(p);
 309 }
 310
 311 static void nfs4_opendata_put(struct nfs4_opendata *p)
 312 {
 313         if (p != NULL)
 314                 kref_put(&p->kref, nfs4_opendata_free);
 315 }
 316
 317 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 318 {
 319         sigset_t oldset;
 320         int ret;
 321
 322         rpc_clnt_sigmask(task->tk_client, &oldset);
 323         ret = rpc_wait_for_completion_task(task);
 324         rpc_clnt_sigunmask(task->tk_client, &oldset);
 325         return ret;
 326 }
 327
 328 static int can_open_cached(struct nfs4_state *state, int mode)
 329 {
 330         int ret = 0;
 331         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 332                 case FMODE_READ:
 333                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 337                         break;
 338                 case FMODE_READ|FMODE_WRITE:
 339                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 340         }
 341         return ret;
 342 }
 343
 344 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 345 {
 346         if ((delegation->type & open_flags) != open_flags)
 347                 return 0;
 348         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 349                 return 0;
 350         return 1;
 351 }
 352
 353 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 354 {
 355         switch (open_flags) {
 356                 case FMODE_WRITE:
 357                         state->n_wronly++;
 358                         break;
 359                 case FMODE_READ:
 360                         state->n_rdonly++;
 361                         break;
 362                 case FMODE_READ|FMODE_WRITE:
 363                         state->n_rdwr++;
 364         }
 365         nfs4_state_set_mode_locked(state, state->state | open_flags);
 366 }
 367
 368 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 369 {
 370         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 371                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 372         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 373         switch (open_flags) {
 374                 case FMODE_READ:
 375                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 376                         break;
 377                 case FMODE_WRITE:
 378                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 379                         break;
 380                 case FMODE_READ|FMODE_WRITE:
 381                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 382         }
 383 }
 384
 385 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 386 {
 387         write_seqlock(&state->seqlock);
 388         nfs_set_open_stateid_locked(state, stateid, open_flags);
 389         write_sequnlock(&state->seqlock);
 390 }
 391
 392 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 393 {
 394         open_flags &= (FMODE_READ|FMODE_WRITE);
 395         /*
 396          * Protect the call to nfs4_state_set_mode_locked and
 397          * serialise the stateid update
 398          */
 399         write_seqlock(&state->seqlock);
 400         if (deleg_stateid != NULL) {
 401                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 402                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 403         }
 404         if (open_stateid != NULL)
 405                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 406         write_sequnlock(&state->seqlock);
 407         spin_lock(&state->owner->so_lock);
 408         update_open_stateflags(state, open_flags);
 409         spin_unlock(&state->owner->so_lock);
 410 }
 411
 412 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 413 {
 414         struct nfs_delegation *delegation;
 415
 416         rcu_read_lock();
 417         delegation = rcu_dereference(NFS_I(inode)->delegation);
 418         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 419                 rcu_read_unlock();
 420                 return;
 421         }
 422         rcu_read_unlock();
 423         nfs_inode_return_delegation(inode);
 424 }
 425
 426 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 427 {
 428         struct nfs4_state *state = opendata->state;
 429         struct nfs_inode *nfsi = NFS_I(state->inode);
 430         struct nfs_delegation *delegation;
 431         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 432         nfs4_stateid stateid;
 433         int ret = -EAGAIN;
 434
 435         rcu_read_lock();
 436         delegation = rcu_dereference(nfsi->delegation);
 437         for (;;) {
 438                 if (can_open_cached(state, open_mode)) {
 439                         spin_lock(&state->owner->so_lock);
 440                         if (can_open_cached(state, open_mode)) {
 441                                 update_open_stateflags(state, open_mode);
 442                                 spin_unlock(&state->owner->so_lock);
 443                                 rcu_read_unlock();
 444                                 goto out_return_state;
 445                         }
 446                         spin_unlock(&state->owner->so_lock);
 447                 }
 448                 if (delegation == NULL)
 449                         break;
 450                 if (!can_open_delegated(delegation, open_mode))
 451                         break;
 452                 /* Save the delegation */
 453                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 454                 rcu_read_unlock();
 455                 lock_kernel();
 456                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 457                 unlock_kernel();
 458                 if (ret != 0)
 459                         goto out;
 460                 ret = -EAGAIN;
 461                 rcu_read_lock();
 462                 delegation = rcu_dereference(nfsi->delegation);
 463                 /* If no delegation, try a cached open */
 464                 if (delegation == NULL)
 465                         continue;
 466                 /* Is the delegation still valid? */
 467                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 468                         continue;
 469                 rcu_read_unlock();
 470                 update_open_stateid(state, NULL, &stateid, open_mode);
 471                 goto out_return_state;
 472         }
 473         rcu_read_unlock();
 474 out:
 475         return ERR_PTR(ret);
 476 out_return_state:
 477         atomic_inc(&state->count);
 478         return state;
 479 }
 480
 481 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 482 {
 483         struct inode *inode;
 484         struct nfs4_state *state = NULL;
 485         struct nfs_delegation *delegation;
 486         nfs4_stateid *deleg_stateid = NULL;
 487         int ret;
 488
 489         if (!data->rpc_done) {
 490                 state = nfs4_try_open_cached(data);
 491                 goto out;
 492         }
 493
 494         ret = -EAGAIN;
 495         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 496                 goto err;
 497         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 498         ret = PTR_ERR(inode);
 499         if (IS_ERR(inode))
 500                 goto err;
 501         ret = -ENOMEM;
 502         state = nfs4_get_open_state(inode, data->owner);
 503         if (state == NULL)
 504                 goto err_put_inode;
 505         if (data->o_res.delegation_type != 0) {
 506                 int delegation_flags = 0;
 507
 508                 rcu_read_lock();
 509                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 510                 if (delegation)
 511                         delegation_flags = delegation->flags;
 512                 rcu_read_unlock();
 513                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 514                         nfs_inode_set_delegation(state->inode,
 515                                         data->owner->so_cred,
 516                                         &data->o_res);
 517                 else
 518                         nfs_inode_reclaim_delegation(state->inode,
 519                                         data->owner->so_cred,
 520                                         &data->o_res);
 521         }
 522         rcu_read_lock();
 523         delegation = rcu_dereference(NFS_I(inode)->delegation);
 524         if (delegation != NULL)
 525                 deleg_stateid = &delegation->stateid;
 526         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 527         rcu_read_unlock();
 528         iput(inode);
 529 out:
 530         return state;
 531 err_put_inode:
 532         iput(inode);
 533 err:
 534         return ERR_PTR(ret);
 535 }
 536
 537 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 538 {
 539         struct nfs_inode *nfsi = NFS_I(state->inode);
 540         struct nfs_open_context *ctx;
 541
 542         spin_lock(&state->inode->i_lock);
 543         list_for_each_entry(ctx, &nfsi->open_files, list) {
 544                 if (ctx->state != state)
 545                         continue;
 546                 get_nfs_open_context(ctx);
 547                 spin_unlock(&state->inode->i_lock);
 548                 return ctx;
 549         }
 550         spin_unlock(&state->inode->i_lock);
 551         return ERR_PTR(-ENOENT);
 552 }
 553
 554 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 555 {
 556         struct nfs4_opendata *opendata;
 557
 558         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 559         if (opendata == NULL)
 560                 return ERR_PTR(-ENOMEM);
 561         opendata->state = state;
 562         atomic_inc(&state->count);
 563         return opendata;
 564 }
 565
 566 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 567 {
 568         struct nfs4_state *newstate;
 569         int ret;
 570
 571         opendata->o_arg.open_flags = openflags;
 572         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 573         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 574         nfs4_init_opendata_res(opendata);
 575         ret = _nfs4_proc_open(opendata);
 576         if (ret != 0)
 577                 return ret;
 578         newstate = nfs4_opendata_to_nfs4_state(opendata);
 579         if (IS_ERR(newstate))
 580                 return PTR_ERR(newstate);
 581         nfs4_close_state(&opendata->path, newstate, openflags);
 582         *res = newstate;
 583         return 0;
 584 }
 585
 586 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 587 {
 588         struct nfs4_state *newstate;
 589         int ret;
 590
 591         /* memory barrier prior to reading state->n_* */
 592         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 593         smp_rmb();
 594         if (state->n_rdwr != 0) {
 595                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 596                 if (ret != 0)
 597                         return ret;
 598                 if (newstate != state)
 599                         return -ESTALE;
 600         }
 601         if (state->n_wronly != 0) {
 602                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 603                 if (ret != 0)
 604                         return ret;
 605                 if (newstate != state)
 606                         return -ESTALE;
 607         }
 608         if (state->n_rdonly != 0) {
 609                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 610                 if (ret != 0)
 611                         return ret;
 612                 if (newstate != state)
 613                         return -ESTALE;
 614         }
 615         /*
 616          * We may have performed cached opens for all three recoveries.
 617          * Check if we need to update the current stateid.
 618          */
 619         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 620             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 621                 write_seqlock(&state->seqlock);
 622                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 623                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 624                 write_sequnlock(&state->seqlock);
 625         }
 626         return 0;
 627 }
 628
 629 /*
 630  * OPEN_RECLAIM:
 631  *      reclaim state on the server after a reboot.
 632  */
 633 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 634 {
 635         struct nfs_delegation *delegation;
 636         struct nfs4_opendata *opendata;
 637         int delegation_type = 0;
 638         int status;
 639
 640         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 641         if (IS_ERR(opendata))
 642                 return PTR_ERR(opendata);
 643         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 644         opendata->o_arg.fh = NFS_FH(state->inode);
 645         rcu_read_lock();
 646         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 647         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 648                 delegation_type = delegation->type;
 649         rcu_read_unlock();
 650         opendata->o_arg.u.delegation_type = delegation_type;
 651         status = nfs4_open_recover(opendata, state);
 652         nfs4_opendata_put(opendata);
 653         return status;
 654 }
 655
 656 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 657 {
 658         struct nfs_server *server = NFS_SERVER(state->inode);
 659         struct nfs4_exception exception = { };
 660         int err;
 661         do {
 662                 err = _nfs4_do_open_reclaim(ctx, state);
 663                 if (err != -NFS4ERR_DELAY)
 664                         break;
 665                 nfs4_handle_exception(server, err, &exception);
 666         } while (exception.retry);
 667         return err;
 668 }
 669
 670 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 671 {
 672         struct nfs_open_context *ctx;
 673         int ret;
 674
 675         ctx = nfs4_state_find_open_context(state);
 676         if (IS_ERR(ctx))
 677                 return PTR_ERR(ctx);
 678         ret = nfs4_do_open_reclaim(ctx, state);
 679         put_nfs_open_context(ctx);
 680         return ret;
 681 }
 682
 683 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 684 {
 685         struct nfs4_opendata *opendata;
 686         int ret;
 687
 688         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 689         if (IS_ERR(opendata))
 690                 return PTR_ERR(opendata);
 691         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 692         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 693                         sizeof(opendata->o_arg.u.delegation.data));
 694         ret = nfs4_open_recover(opendata, state);
 695         nfs4_opendata_put(opendata);
 696         return ret;
 697 }
 698
 699 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 700 {
 701         struct nfs4_exception exception = { };
 702         struct nfs_server *server = NFS_SERVER(state->inode);
 703         int err;
 704         do {
 705                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 706                 switch (err) {
 707                         case 0:
 708                                 return err;
 709                         case -NFS4ERR_STALE_CLIENTID:
 710                         case -NFS4ERR_STALE_STATEID:
 711                         case -NFS4ERR_EXPIRED:
 712                                 /* Don't recall a delegation if it was lost */
 713                                 nfs4_schedule_state_recovery(server->nfs_client);
 714                                 return err;
 715                 }
 716                 err = nfs4_handle_exception(server, err, &exception);
 717         } while (exception.retry);
 718         return err;
 719 }
 720
 721 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 722 {
 723         struct nfs4_opendata *data = calldata;
 724
 725         data->rpc_status = task->tk_status;
 726         if (RPC_ASSASSINATED(task))
 727                 return;
 728         if (data->rpc_status == 0) {
 729                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 730                                 sizeof(data->o_res.stateid.data));
 731                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 732                 renew_lease(data->o_res.server, data->timestamp);
 733                 data->rpc_done = 1;
 734         }
 735         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 736 }
 737
 738 static void nfs4_open_confirm_release(void *calldata)
 739 {
 740         struct nfs4_opendata *data = calldata;
 741         struct nfs4_state *state = NULL;
 742
 743         /* If this request hasn't been cancelled, do nothing */
 744         if (data->cancelled == 0)
 745                 goto out_free;
 746         /* In case of error, no cleanup! */
 747         if (!data->rpc_done)
 748                 goto out_free;
 749         state = nfs4_opendata_to_nfs4_state(data);
 750         if (!IS_ERR(state))
 751                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 752 out_free:
 753         nfs4_opendata_put(data);
 754 }
 755
 756 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 757         .rpc_call_done = nfs4_open_confirm_done,
 758         .rpc_release = nfs4_open_confirm_release,
 759 };
 760
 761 /*
 762  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 763  */
 764 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 765 {
 766         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 767         struct rpc_task *task;
 768         struct  rpc_message msg = {
 769                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 770                 .rpc_argp = &data->c_arg,
 771                 .rpc_resp = &data->c_res,
 772                 .rpc_cred = data->owner->so_cred,
 773         };
 774         struct rpc_task_setup task_setup_data = {
 775                 .rpc_client = server->client,
 776                 .rpc_message = &msg,
 777                 .callback_ops = &nfs4_open_confirm_ops,
 778                 .callback_data = data,
 779                 .flags = RPC_TASK_ASYNC,
 780         };
 781         int status;
 782
 783         kref_get(&data->kref);
 784         data->rpc_done = 0;
 785         data->rpc_status = 0;
 786         data->timestamp = jiffies;
 787         task = rpc_run_task(&task_setup_data);
 788         if (IS_ERR(task))
 789                 return PTR_ERR(task);
 790         status = nfs4_wait_for_completion_rpc_task(task);
 791         if (status != 0) {
 792                 data->cancelled = 1;
 793                 smp_wmb();
 794         } else
 795                 status = data->rpc_status;
 796         rpc_put_task(task);
 797         return status;
 798 }
 799
 800 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 801 {
 802         struct nfs4_opendata *data = calldata;
 803         struct nfs4_state_owner *sp = data->owner;
 804
 805         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 806                 return;
 807         /*
 808          * Check if we still need to send an OPEN call, or if we can use
 809          * a delegation instead.
 810          */
 811         if (data->state != NULL) {
 812                 struct nfs_delegation *delegation;
 813
 814                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 815                         goto out_no_action;
 816                 rcu_read_lock();
 817                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 818                 if (delegation != NULL &&
 819                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 820                         rcu_read_unlock();
 821                         goto out_no_action;
 822                 }
 823                 rcu_read_unlock();
 824         }
 825         /* Update sequence id. */
 826         data->o_arg.id = sp->so_owner_id.id;
 827         data->o_arg.clientid = sp->so_client->cl_clientid;
 828         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 829                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 830                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 831         }
 832         data->timestamp = jiffies;
 833         rpc_call_start(task);
 834         return;
 835 out_no_action:
 836         task->tk_action = NULL;
 837
 838 }
 839
 840 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 841 {
 842         struct nfs4_opendata *data = calldata;
 843
 844         data->rpc_status = task->tk_status;
 845         if (RPC_ASSASSINATED(task))
 846                 return;
 847         if (task->tk_status == 0) {
 848                 switch (data->o_res.f_attr->mode & S_IFMT) {
 849                         case S_IFREG:
 850                                 break;
 851                         case S_IFLNK:
 852                                 data->rpc_status = -ELOOP;
 853                                 break;
 854                         case S_IFDIR:
 855                                 data->rpc_status = -EISDIR;
 856                                 break;
 857                         default:
 858                                 data->rpc_status = -ENOTDIR;
 859                 }
 860                 renew_lease(data->o_res.server, data->timestamp);
 861                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 862                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 863         }
 864         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 865         data->rpc_done = 1;
 866 }
 867
 868 static void nfs4_open_release(void *calldata)
 869 {
 870         struct nfs4_opendata *data = calldata;
 871         struct nfs4_state *state = NULL;
 872
 873         /* If this request hasn't been cancelled, do nothing */
 874         if (data->cancelled == 0)
 875                 goto out_free;
 876         /* In case of error, no cleanup! */
 877         if (data->rpc_status != 0 || !data->rpc_done)
 878                 goto out_free;
 879         /* In case we need an open_confirm, no cleanup! */
 880         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 881                 goto out_free;
 882         state = nfs4_opendata_to_nfs4_state(data);
 883         if (!IS_ERR(state))
 884                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 885 out_free:
 886         nfs4_opendata_put(data);
 887 }
 888
 889 static const struct rpc_call_ops nfs4_open_ops = {
 890         .rpc_call_prepare = nfs4_open_prepare,
 891         .rpc_call_done = nfs4_open_done,
 892         .rpc_release = nfs4_open_release,
 893 };
 894
 895 /*
 896  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 897  */
 898 static int _nfs4_proc_open(struct nfs4_opendata *data)
 899 {
 900         struct inode *dir = data->dir->d_inode;
 901         struct nfs_server *server = NFS_SERVER(dir);
 902         struct nfs_openargs *o_arg = &data->o_arg;
 903         struct nfs_openres *o_res = &data->o_res;
 904         struct rpc_task *task;
 905         struct rpc_message msg = {
 906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 907                 .rpc_argp = o_arg,
 908                 .rpc_resp = o_res,
 909                 .rpc_cred = data->owner->so_cred,
 910         };
 911         struct rpc_task_setup task_setup_data = {
 912                 .rpc_client = server->client,
 913                 .rpc_message = &msg,
 914                 .callback_ops = &nfs4_open_ops,
 915                 .callback_data = data,
 916                 .flags = RPC_TASK_ASYNC,
 917         };
 918         int status;
 919
 920         kref_get(&data->kref);
 921         data->rpc_done = 0;
 922         data->rpc_status = 0;
 923         data->cancelled = 0;
 924         task = rpc_run_task(&task_setup_data);
 925         if (IS_ERR(task))
 926                 return PTR_ERR(task);
 927         status = nfs4_wait_for_completion_rpc_task(task);
 928         if (status != 0) {
 929                 data->cancelled = 1;
 930                 smp_wmb();
 931         } else
 932                 status = data->rpc_status;
 933         rpc_put_task(task);
 934         if (status != 0 || !data->rpc_done)
 935                 return status;
 936
 937         if (o_res->fh.size == 0)
 938                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 939
 940         if (o_arg->open_flags & O_CREAT) {
 941                 update_changeattr(dir, &o_res->cinfo);
 942                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 943         } else
 944                 nfs_refresh_inode(dir, o_res->dir_attr);
 945         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 946                 status = _nfs4_proc_open_confirm(data);
 947                 if (status != 0)
 948                         return status;
 949         }
 950         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 951                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 952         return 0;
 953 }
 954
 955 static int nfs4_recover_expired_lease(struct nfs_server *server)
 956 {
 957         struct nfs_client *clp = server->nfs_client;
 958         int ret;
 959
 960         for (;;) {
 961                 ret = nfs4_wait_clnt_recover(server->client, clp);
 962                 if (ret != 0)
 963                         return ret;
 964                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 965                         break;
 966                 nfs4_schedule_state_recovery(clp);
 967         }
 968         return 0;
 969 }
 970
 971 /*
 972  * OPEN_EXPIRED:
 973  *      reclaim state on the server after a network partition.
 974  *      Assumes caller holds the appropriate lock
 975  */
 976 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 977 {
 978         struct nfs4_opendata *opendata;
 979         int ret;
 980
 981         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 982         if (IS_ERR(opendata))
 983                 return PTR_ERR(opendata);
 984         ret = nfs4_open_recover(opendata, state);
 985         if (ret == -ESTALE) {
 986                 /* Invalidate the state owner so we don't ever use it again */
 987                 nfs4_drop_state_owner(state->owner);
 988                 d_drop(ctx->path.dentry);
 989         }
 990         nfs4_opendata_put(opendata);
 991         return ret;
 992 }
 993
 994 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 995 {
 996         struct nfs_server *server = NFS_SERVER(state->inode);
 997         struct nfs4_exception exception = { };
 998         int err;
 999
1000         do {
1001                 err = _nfs4_open_expired(ctx, state);
1002                 if (err == -NFS4ERR_DELAY)
1003                         nfs4_handle_exception(server, err, &exception);
1004         } while (exception.retry);
1005         return err;
1006 }
1007
1008 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1009 {
1010         struct nfs_open_context *ctx;
1011         int ret;
1012
1013         ctx = nfs4_state_find_open_context(state);
1014         if (IS_ERR(ctx))
1015                 return PTR_ERR(ctx);
1016         ret = nfs4_do_open_expired(ctx, state);
1017         put_nfs_open_context(ctx);
1018         return ret;
1019 }
1020
1021 /*
1022  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1023  * fields corresponding to attributes that were used to store the verifier.
1024  * Make sure we clobber those fields in the later setattr call
1025  */
1026 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1027 {
1028         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1029             !(sattr->ia_valid & ATTR_ATIME_SET))
1030                 sattr->ia_valid |= ATTR_ATIME;
1031
1032         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1033             !(sattr->ia_valid & ATTR_MTIME_SET))
1034                 sattr->ia_valid |= ATTR_MTIME;
1035 }
1036
1037 /*
1038  * Returns a referenced nfs4_state
1039  */
1040 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1041 {
1042         struct nfs4_state_owner  *sp;
1043         struct nfs4_state     *state = NULL;
1044         struct nfs_server       *server = NFS_SERVER(dir);
1045         struct nfs_client *clp = server->nfs_client;
1046         struct nfs4_opendata *opendata;
1047         int status;
1048
1049         /* Protect against reboot recovery conflicts */
1050         status = -ENOMEM;
1051         if (!(sp = nfs4_get_state_owner(server, cred))) {
1052                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1053                 goto out_err;
1054         }
1055         status = nfs4_recover_expired_lease(server);
1056         if (status != 0)
1057                 goto err_put_state_owner;
1058         if (path->dentry->d_inode != NULL)
1059                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1060         down_read(&clp->cl_sem);
1061         status = -ENOMEM;
1062         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1063         if (opendata == NULL)
1064                 goto err_release_rwsem;
1065
1066         if (path->dentry->d_inode != NULL)
1067                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1068
1069         status = _nfs4_proc_open(opendata);
1070         if (status != 0)
1071                 goto err_opendata_put;
1072
1073         if (opendata->o_arg.open_flags & O_EXCL)
1074                 nfs4_exclusive_attrset(opendata, sattr);
1075
1076         state = nfs4_opendata_to_nfs4_state(opendata);
1077         status = PTR_ERR(state);
1078         if (IS_ERR(state))
1079                 goto err_opendata_put;
1080         nfs4_opendata_put(opendata);
1081         nfs4_put_state_owner(sp);
1082         up_read(&clp->cl_sem);
1083         *res = state;
1084         return 0;
1085 err_opendata_put:
1086         nfs4_opendata_put(opendata);
1087 err_release_rwsem:
1088         up_read(&clp->cl_sem);
1089 err_put_state_owner:
1090         nfs4_put_state_owner(sp);
1091 out_err:
1092         *res = NULL;
1093         return status;
1094 }
1095
1096
1097 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1098 {
1099         struct nfs4_exception exception = { };
1100         struct nfs4_state *res;
1101         int status;
1102
1103         do {
1104                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1105                 if (status == 0)
1106                         break;
1107                 /* NOTE: BAD_SEQID means the server and client disagree about the
1108                  * book-keeping w.r.t. state-changing operations
1109                  * (OPEN/CLOSE/LOCK/LOCKU...)
1110                  * It is actually a sign of a bug on the client or on the server.
1111                  *
1112                  * If we receive a BAD_SEQID error in the particular case of
1113                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1114                  * have unhashed the old state_owner for us, and that we can
1115                  * therefore safely retry using a new one. We should still warn
1116                  * the user though...
1117                  */
1118                 if (status == -NFS4ERR_BAD_SEQID) {
1119                         printk(KERN_WARNING "NFS: v4 server %s "
1120                                         " returned a bad sequence-id error!\n",
1121                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1122                         exception.retry = 1;
1123                         continue;
1124                 }
1125                 /*
1126                  * BAD_STATEID on OPEN means that the server cancelled our
1127                  * state before it received the OPEN_CONFIRM.
1128                  * Recover by retrying the request as per the discussion
1129                  * on Page 181 of RFC3530.
1130                  */
1131                 if (status == -NFS4ERR_BAD_STATEID) {
1132                         exception.retry = 1;
1133                         continue;
1134                 }
1135                 if (status == -EAGAIN) {
1136                         /* We must have found a delegation */
1137                         exception.retry = 1;
1138                         continue;
1139                 }
1140                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1141                                         status, &exception));
1142         } while (exception.retry);
1143         return res;
1144 }
1145
1146 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1147                 struct iattr *sattr, struct nfs4_state *state)
1148 {
1149         struct nfs_server *server = NFS_SERVER(inode);
1150         struct nfs_setattrargs  arg = {
1151                 .fh             = NFS_FH(inode),
1152                 .iap            = sattr,
1153                 .server         = server,
1154                 .bitmask = server->attr_bitmask,
1155         };
1156         struct nfs_setattrres  res = {
1157                 .fattr          = fattr,
1158                 .server         = server,
1159         };
1160         struct rpc_message msg = {
1161                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1162                 .rpc_argp       = &arg,
1163                 .rpc_resp       = &res,
1164         };
1165         unsigned long timestamp = jiffies;
1166         int status;
1167
1168         nfs_fattr_init(fattr);
1169
1170         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1171                 /* Use that stateid */
1172         } else if (state != NULL) {
1173                 msg.rpc_cred = state->owner->so_cred;
1174                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1175         } else
1176                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1177
1178         status = rpc_call_sync(server->client, &msg, 0);
1179         if (status == 0 && state != NULL)
1180                 renew_lease(server, timestamp);
1181         return status;
1182 }
1183
1184 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1185                 struct iattr *sattr, struct nfs4_state *state)
1186 {
1187         struct nfs_server *server = NFS_SERVER(inode);
1188         struct nfs4_exception exception = { };
1189         int err;
1190         do {
1191                 err = nfs4_handle_exception(server,
1192                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1193                                 &exception);
1194         } while (exception.retry);
1195         return err;
1196 }
1197
1198 struct nfs4_closedata {
1199         struct path path;
1200         struct inode *inode;
1201         struct nfs4_state *state;
1202         struct nfs_closeargs arg;
1203         struct nfs_closeres res;
1204         struct nfs_fattr fattr;
1205         unsigned long timestamp;
1206 };
1207
1208 static void nfs4_free_closedata(void *data)
1209 {
1210         struct nfs4_closedata *calldata = data;
1211         struct nfs4_state_owner *sp = calldata->state->owner;
1212
1213         nfs4_put_open_state(calldata->state);
1214         nfs_free_seqid(calldata->arg.seqid);
1215         nfs4_put_state_owner(sp);
1216         dput(calldata->path.dentry);
1217         mntput(calldata->path.mnt);
1218         kfree(calldata);
1219 }
1220
1221 static void nfs4_close_done(struct rpc_task *task, void *data)
1222 {
1223         struct nfs4_closedata *calldata = data;
1224         struct nfs4_state *state = calldata->state;
1225         struct nfs_server *server = NFS_SERVER(calldata->inode);
1226
1227         if (RPC_ASSASSINATED(task))
1228                 return;
1229         /* hmm. we are done with the inode, and in the process of freeing
1230          * the state_owner. we keep this around to process errors
1231          */
1232         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1233         switch (task->tk_status) {
1234                 case 0:
1235                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1236                         renew_lease(server, calldata->timestamp);
1237                         break;
1238                 case -NFS4ERR_STALE_STATEID:
1239                 case -NFS4ERR_EXPIRED:
1240                         break;
1241                 default:
1242                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1243                                 rpc_restart_call(task);
1244                                 return;
1245                         }
1246         }
1247         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1248 }
1249
1250 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1251 {
1252         struct nfs4_closedata *calldata = data;
1253         struct nfs4_state *state = calldata->state;
1254         int clear_rd, clear_wr, clear_rdwr;
1255
1256         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1257                 return;
1258
1259         clear_rd = clear_wr = clear_rdwr = 0;
1260         spin_lock(&state->owner->so_lock);
1261         /* Calculate the change in open mode */
1262         if (state->n_rdwr == 0) {
1263                 if (state->n_rdonly == 0) {
1264                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1265                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1266                 }
1267                 if (state->n_wronly == 0) {
1268                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1269                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1270                 }
1271         }
1272         spin_unlock(&state->owner->so_lock);
1273         if (!clear_rd && !clear_wr && !clear_rdwr) {
1274                 /* Note: exit _without_ calling nfs4_close_done */
1275                 task->tk_action = NULL;
1276                 return;
1277         }
1278         nfs_fattr_init(calldata->res.fattr);
1279         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1280                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1281                 calldata->arg.open_flags = FMODE_READ;
1282         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1283                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1284                 calldata->arg.open_flags = FMODE_WRITE;
1285         }
1286         calldata->timestamp = jiffies;
1287         rpc_call_start(task);
1288 }
1289
1290 static const struct rpc_call_ops nfs4_close_ops = {
1291         .rpc_call_prepare = nfs4_close_prepare,
1292         .rpc_call_done = nfs4_close_done,
1293         .rpc_release = nfs4_free_closedata,
1294 };
1295
1296 /*
1297  * It is possible for data to be read/written from a mem-mapped file
1298  * after the sys_close call (which hits the vfs layer as a flush).
1299  * This means that we can't safely call nfsv4 close on a file until
1300  * the inode is cleared. This in turn means that we are not good
1301  * NFSv4 citizens - we do not indicate to the server to update the file's
1302  * share state even when we are done with one of the three share
1303  * stateid's in the inode.
1304  *
1305  * NOTE: Caller must be holding the sp->so_owner semaphore!
1306  */
1307 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1308 {
1309         struct nfs_server *server = NFS_SERVER(state->inode);
1310         struct nfs4_closedata *calldata;
1311         struct nfs4_state_owner *sp = state->owner;
1312         struct rpc_task *task;
1313         struct rpc_message msg = {
1314                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1315                 .rpc_cred = state->owner->so_cred,
1316         };
1317         struct rpc_task_setup task_setup_data = {
1318                 .rpc_client = server->client,
1319                 .rpc_message = &msg,
1320                 .callback_ops = &nfs4_close_ops,
1321                 .flags = RPC_TASK_ASYNC,
1322         };
1323         int status = -ENOMEM;
1324
1325         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1326         if (calldata == NULL)
1327                 goto out;
1328         calldata->inode = state->inode;
1329         calldata->state = state;
1330         calldata->arg.fh = NFS_FH(state->inode);
1331         calldata->arg.stateid = &state->open_stateid;
1332         /* Serialization for the sequence id */
1333         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1334         if (calldata->arg.seqid == NULL)
1335                 goto out_free_calldata;
1336         calldata->arg.bitmask = server->attr_bitmask;
1337         calldata->res.fattr = &calldata->fattr;
1338         calldata->res.server = server;
1339         calldata->path.mnt = mntget(path->mnt);
1340         calldata->path.dentry = dget(path->dentry);
1341
1342         msg.rpc_argp = &calldata->arg,
1343         msg.rpc_resp = &calldata->res,
1344         task_setup_data.callback_data = calldata;
1345         task = rpc_run_task(&task_setup_data);
1346         if (IS_ERR(task))
1347                 return PTR_ERR(task);
1348         status = 0;
1349         if (wait)
1350                 status = rpc_wait_for_completion_task(task);
1351         rpc_put_task(task);
1352         return status;
1353 out_free_calldata:
1354         kfree(calldata);
1355 out:
1356         nfs4_put_open_state(state);
1357         nfs4_put_state_owner(sp);
1358         return status;
1359 }
1360
1361 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1362 {
1363         struct file *filp;
1364         int ret;
1365
1366         /* If the open_intent is for execute, we have an extra check to make */
1367         if (nd->intent.open.flags & FMODE_EXEC) {
1368                 ret = nfs_may_open(state->inode,
1369                                 state->owner->so_cred,
1370                                 nd->intent.open.flags);
1371                 if (ret < 0)
1372                         goto out_close;
1373         }
1374         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1375         if (!IS_ERR(filp)) {
1376                 struct nfs_open_context *ctx;
1377                 ctx = nfs_file_open_context(filp);
1378                 ctx->state = state;
1379                 return 0;
1380         }
1381         ret = PTR_ERR(filp);
1382 out_close:
1383         nfs4_close_sync(path, state, nd->intent.open.flags);
1384         return ret;
1385 }
1386
1387 struct dentry *
1388 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1389 {
1390         struct dentry *parent;
1391         struct path path = {
1392                 .mnt = nd->mnt,
1393                 .dentry = dentry,
1394         };
1395         struct iattr attr;
1396         struct rpc_cred *cred;
1397         struct nfs4_state *state;
1398         struct dentry *res;
1399
1400         if (nd->flags & LOOKUP_CREATE) {
1401                 attr.ia_mode = nd->intent.open.create_mode;
1402                 attr.ia_valid = ATTR_MODE;
1403                 if (!IS_POSIXACL(dir))
1404                         attr.ia_mode &= ~current->fs->umask;
1405         } else {
1406                 attr.ia_valid = 0;
1407                 BUG_ON(nd->intent.open.flags & O_CREAT);
1408         }
1409
1410         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1411         if (IS_ERR(cred))
1412                 return (struct dentry *)cred;
1413         parent = dentry->d_parent;
1414         /* Protect against concurrent sillydeletes */
1415         nfs_block_sillyrename(parent);
1416         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1417         put_rpccred(cred);
1418         if (IS_ERR(state)) {
1419                 if (PTR_ERR(state) == -ENOENT) {
1420                         d_add(dentry, NULL);
1421                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1422                 }
1423                 nfs_unblock_sillyrename(parent);
1424                 return (struct dentry *)state;
1425         }
1426         res = d_add_unique(dentry, igrab(state->inode));
1427         if (res != NULL)
1428                 path.dentry = res;
1429         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1430         nfs_unblock_sillyrename(parent);
1431         nfs4_intent_set_file(nd, &path, state);
1432         return res;
1433 }
1434
1435 int
1436 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1437 {
1438         struct path path = {
1439                 .mnt = nd->mnt,
1440                 .dentry = dentry,
1441         };
1442         struct rpc_cred *cred;
1443         struct nfs4_state *state;
1444
1445         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1446         if (IS_ERR(cred))
1447                 return PTR_ERR(cred);
1448         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1449         put_rpccred(cred);
1450         if (IS_ERR(state)) {
1451                 switch (PTR_ERR(state)) {
1452                         case -EPERM:
1453                         case -EACCES:
1454                         case -EDQUOT:
1455                         case -ENOSPC:
1456                         case -EROFS:
1457                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1458                                 return 1;
1459                         default:
1460                                 goto out_drop;
1461                 }
1462         }
1463         if (state->inode == dentry->d_inode) {
1464                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1465                 nfs4_intent_set_file(nd, &path, state);
1466                 return 1;
1467         }
1468         nfs4_close_sync(&path, state, openflags);
1469 out_drop:
1470         d_drop(dentry);
1471         return 0;
1472 }
1473
1474
1475 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1476 {
1477         struct nfs4_server_caps_res res = {};
1478         struct rpc_message msg = {
1479                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1480                 .rpc_argp = fhandle,
1481                 .rpc_resp = &res,
1482         };
1483         int status;
1484
1485         status = rpc_call_sync(server->client, &msg, 0);
1486         if (status == 0) {
1487                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1488                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1489                         server->caps |= NFS_CAP_ACLS;
1490                 if (res.has_links != 0)
1491                         server->caps |= NFS_CAP_HARDLINKS;
1492                 if (res.has_symlinks != 0)
1493                         server->caps |= NFS_CAP_SYMLINKS;
1494                 server->acl_bitmask = res.acl_bitmask;
1495         }
1496         return status;
1497 }
1498
1499 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1500 {
1501         struct nfs4_exception exception = { };
1502         int err;
1503         do {
1504                 err = nfs4_handle_exception(server,
1505                                 _nfs4_server_capabilities(server, fhandle),
1506                                 &exception);
1507         } while (exception.retry);
1508         return err;
1509 }
1510
1511 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1512                 struct nfs_fsinfo *info)
1513 {
1514         struct nfs4_lookup_root_arg args = {
1515                 .bitmask = nfs4_fattr_bitmap,
1516         };
1517         struct nfs4_lookup_res res = {
1518                 .server = server,
1519                 .fattr = info->fattr,
1520                 .fh = fhandle,
1521         };
1522         struct rpc_message msg = {
1523                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1524                 .rpc_argp = &args,
1525                 .rpc_resp = &res,
1526         };
1527         nfs_fattr_init(info->fattr);
1528         return rpc_call_sync(server->client, &msg, 0);
1529 }
1530
1531 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1532                 struct nfs_fsinfo *info)
1533 {
1534         struct nfs4_exception exception = { };
1535         int err;
1536         do {
1537                 err = nfs4_handle_exception(server,
1538                                 _nfs4_lookup_root(server, fhandle, info),
1539                                 &exception);
1540         } while (exception.retry);
1541         return err;
1542 }
1543
1544 /*
1545  * get the file handle for the "/" directory on the server
1546  */
1547 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1548                               struct nfs_fsinfo *info)
1549 {
1550         int status;
1551
1552         status = nfs4_lookup_root(server, fhandle, info);
1553         if (status == 0)
1554                 status = nfs4_server_capabilities(server, fhandle);
1555         if (status == 0)
1556                 status = nfs4_do_fsinfo(server, fhandle, info);
1557         return nfs4_map_errors(status);
1558 }
1559
1560 /*
1561  * Get locations and (maybe) other attributes of a referral.
1562  * Note that we'll actually follow the referral later when
1563  * we detect fsid mismatch in inode revalidation
1564  */
1565 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1566 {
1567         int status = -ENOMEM;
1568         struct page *page = NULL;
1569         struct nfs4_fs_locations *locations = NULL;
1570
1571         page = alloc_page(GFP_KERNEL);
1572         if (page == NULL)
1573                 goto out;
1574         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1575         if (locations == NULL)
1576                 goto out;
1577
1578         status = nfs4_proc_fs_locations(dir, name, locations, page);
1579         if (status != 0)
1580                 goto out;
1581         /* Make sure server returned a different fsid for the referral */
1582         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1583                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1584                 status = -EIO;
1585                 goto out;
1586         }
1587
1588         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1589         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1590         if (!fattr->mode)
1591                 fattr->mode = S_IFDIR;
1592         memset(fhandle, 0, sizeof(struct nfs_fh));
1593 out:
1594         if (page)
1595                 __free_page(page);
1596         if (locations)
1597                 kfree(locations);
1598         return status;
1599 }
1600
1601 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1602 {
1603         struct nfs4_getattr_arg args = {
1604                 .fh = fhandle,
1605                 .bitmask = server->attr_bitmask,
1606         };
1607         struct nfs4_getattr_res res = {
1608                 .fattr = fattr,
1609                 .server = server,
1610         };
1611         struct rpc_message msg = {
1612                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1613                 .rpc_argp = &args,
1614                 .rpc_resp = &res,
1615         };
1616
1617         nfs_fattr_init(fattr);
1618         return rpc_call_sync(server->client, &msg, 0);
1619 }
1620
1621 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1622 {
1623         struct nfs4_exception exception = { };
1624         int err;
1625         do {
1626                 err = nfs4_handle_exception(server,
1627                                 _nfs4_proc_getattr(server, fhandle, fattr),
1628                                 &exception);
1629         } while (exception.retry);
1630         return err;
1631 }
1632
1633 /*
1634  * The file is not closed if it is opened due to the a request to change
1635  * the size of the file. The open call will not be needed once the
1636  * VFS layer lookup-intents are implemented.
1637  *
1638  * Close is called when the inode is destroyed.
1639  * If we haven't opened the file for O_WRONLY, we
1640  * need to in the size_change case to obtain a stateid.
1641  *
1642  * Got race?
1643  * Because OPEN is always done by name in nfsv4, it is
1644  * possible that we opened a different file by the same
1645  * name.  We can recognize this race condition, but we
1646  * can't do anything about it besides returning an error.
1647  *
1648  * This will be fixed with VFS changes (lookup-intent).
1649  */
1650 static int
1651 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1652                   struct iattr *sattr)
1653 {
1654         struct rpc_cred *cred;
1655         struct inode *inode = dentry->d_inode;
1656         struct nfs_open_context *ctx;
1657         struct nfs4_state *state = NULL;
1658         int status;
1659
1660         nfs_fattr_init(fattr);
1661
1662         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1663         if (IS_ERR(cred))
1664                 return PTR_ERR(cred);
1665
1666         /* Search for an existing open(O_WRITE) file */
1667         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1668         if (ctx != NULL)
1669                 state = ctx->state;
1670
1671         status = nfs4_do_setattr(inode, fattr, sattr, state);
1672         if (status == 0)
1673                 nfs_setattr_update_inode(inode, sattr);
1674         if (ctx != NULL)
1675                 put_nfs_open_context(ctx);
1676         put_rpccred(cred);
1677         return status;
1678 }
1679
1680 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1681                 const struct qstr *name, struct nfs_fh *fhandle,
1682                 struct nfs_fattr *fattr)
1683 {
1684         int                    status;
1685         struct nfs4_lookup_arg args = {
1686                 .bitmask = server->attr_bitmask,
1687                 .dir_fh = dirfh,
1688                 .name = name,
1689         };
1690         struct nfs4_lookup_res res = {
1691                 .server = server,
1692                 .fattr = fattr,
1693                 .fh = fhandle,
1694         };
1695         struct rpc_message msg = {
1696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1697                 .rpc_argp = &args,
1698                 .rpc_resp = &res,
1699         };
1700
1701         nfs_fattr_init(fattr);
1702
1703         dprintk("NFS call  lookupfh %s\n", name->name);
1704         status = rpc_call_sync(server->client, &msg, 0);
1705         dprintk("NFS reply lookupfh: %d\n", status);
1706         return status;
1707 }
1708
1709 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1710                               struct qstr *name, struct nfs_fh *fhandle,
1711                               struct nfs_fattr *fattr)
1712 {
1713         struct nfs4_exception exception = { };
1714         int err;
1715         do {
1716                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1717                 /* FIXME: !!!! */
1718                 if (err == -NFS4ERR_MOVED) {
1719                         err = -EREMOTE;
1720                         break;
1721                 }
1722                 err = nfs4_handle_exception(server, err, &exception);
1723         } while (exception.retry);
1724         return err;
1725 }
1726
1727 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1728                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1729 {
1730         int status;
1731
1732         dprintk("NFS call  lookup %s\n", name->name);
1733         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1734         if (status == -NFS4ERR_MOVED)
1735                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1736         dprintk("NFS reply lookup: %d\n", status);
1737         return status;
1738 }
1739
1740 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1741 {
1742         struct nfs4_exception exception = { };
1743         int err;
1744         do {
1745                 err = nfs4_handle_exception(NFS_SERVER(dir),
1746                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1747                                 &exception);
1748         } while (exception.retry);
1749         return err;
1750 }
1751
1752 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1753 {
1754         struct nfs_server *server = NFS_SERVER(inode);
1755         struct nfs_fattr fattr;
1756         struct nfs4_accessargs args = {
1757                 .fh = NFS_FH(inode),
1758                 .bitmask = server->attr_bitmask,
1759         };
1760         struct nfs4_accessres res = {
1761                 .server = server,
1762                 .fattr = &fattr,
1763         };
1764         struct rpc_message msg = {
1765                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1766                 .rpc_argp = &args,
1767                 .rpc_resp = &res,
1768                 .rpc_cred = entry->cred,
1769         };
1770         int mode = entry->mask;
1771         int status;
1772
1773         /*
1774          * Determine which access bits we want to ask for...
1775          */
1776         if (mode & MAY_READ)
1777                 args.access |= NFS4_ACCESS_READ;
1778         if (S_ISDIR(inode->i_mode)) {
1779                 if (mode & MAY_WRITE)
1780                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1781                 if (mode & MAY_EXEC)
1782                         args.access |= NFS4_ACCESS_LOOKUP;
1783         } else {
1784                 if (mode & MAY_WRITE)
1785                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1786                 if (mode & MAY_EXEC)
1787                         args.access |= NFS4_ACCESS_EXECUTE;
1788         }
1789         nfs_fattr_init(&fattr);
1790         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1791         if (!status) {
1792                 entry->mask = 0;
1793                 if (res.access & NFS4_ACCESS_READ)
1794                         entry->mask |= MAY_READ;
1795                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1796                         entry->mask |= MAY_WRITE;
1797                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1798                         entry->mask |= MAY_EXEC;
1799                 nfs_refresh_inode(inode, &fattr);
1800         }
1801         return status;
1802 }
1803
1804 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1805 {
1806         struct nfs4_exception exception = { };
1807         int err;
1808         do {
1809                 err = nfs4_handle_exception(NFS_SERVER(inode),
1810                                 _nfs4_proc_access(inode, entry),
1811                                 &exception);
1812         } while (exception.retry);
1813         return err;
1814 }
1815
1816 /*
1817  * TODO: For the time being, we don't try to get any attributes
1818  * along with any of the zero-copy operations READ, READDIR,
1819  * READLINK, WRITE.
1820  *
1821  * In the case of the first three, we want to put the GETATTR
1822  * after the read-type operation -- this is because it is hard
1823  * to predict the length of a GETATTR response in v4, and thus
1824  * align the READ data correctly.  This means that the GETATTR
1825  * may end up partially falling into the page cache, and we should
1826  * shift it into the 'tail' of the xdr_buf before processing.
1827  * To do this efficiently, we need to know the total length
1828  * of data received, which doesn't seem to be available outside
1829  * of the RPC layer.
1830  *
1831  * In the case of WRITE, we also want to put the GETATTR after
1832  * the operation -- in this case because we want to make sure
1833  * we get the post-operation mtime and size.  This means that
1834  * we can't use xdr_encode_pages() as written: we need a variant
1835  * of it which would leave room in the 'tail' iovec.
1836  *
1837  * Both of these changes to the XDR layer would in fact be quite
1838  * minor, but I decided to leave them for a subsequent patch.
1839  */
1840 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1841                 unsigned int pgbase, unsigned int pglen)
1842 {
1843         struct nfs4_readlink args = {
1844                 .fh       = NFS_FH(inode),
1845                 .pgbase   = pgbase,
1846                 .pglen    = pglen,
1847                 .pages    = &page,
1848         };
1849         struct rpc_message msg = {
1850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1851                 .rpc_argp = &args,
1852                 .rpc_resp = NULL,
1853         };
1854
1855         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1856 }
1857
1858 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1859                 unsigned int pgbase, unsigned int pglen)
1860 {
1861         struct nfs4_exception exception = { };
1862         int err;
1863         do {
1864                 err = nfs4_handle_exception(NFS_SERVER(inode),
1865                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1866                                 &exception);
1867         } while (exception.retry);
1868         return err;
1869 }
1870
1871 /*
1872  * Got race?
1873  * We will need to arrange for the VFS layer to provide an atomic open.
1874  * Until then, this create/open method is prone to inefficiency and race
1875  * conditions due to the lookup, create, and open VFS calls from sys_open()
1876  * placed on the wire.
1877  *
1878  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1879  * The file will be opened again in the subsequent VFS open call
1880  * (nfs4_proc_file_open).
1881  *
1882  * The open for read will just hang around to be used by any process that
1883  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1884  */
1885
1886 static int
1887 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1888                  int flags, struct nameidata *nd)
1889 {
1890         struct path path = {
1891                 .mnt = nd->mnt,
1892                 .dentry = dentry,
1893         };
1894         struct nfs4_state *state;
1895         struct rpc_cred *cred;
1896         int status = 0;
1897
1898         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1899         if (IS_ERR(cred)) {
1900                 status = PTR_ERR(cred);
1901                 goto out;
1902         }
1903         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1904         put_rpccred(cred);
1905         d_drop(dentry);
1906         if (IS_ERR(state)) {
1907                 status = PTR_ERR(state);
1908                 goto out;
1909         }
1910         d_add(dentry, igrab(state->inode));
1911         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1912         if (flags & O_EXCL) {
1913                 struct nfs_fattr fattr;
1914                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1915                 if (status == 0)
1916                         nfs_setattr_update_inode(state->inode, sattr);
1917                 nfs_post_op_update_inode(state->inode, &fattr);
1918         }
1919         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1920                 status = nfs4_intent_set_file(nd, &path, state);
1921         else
1922                 nfs4_close_sync(&path, state, flags);
1923 out:
1924         return status;
1925 }
1926
1927 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1928 {
1929         struct nfs_server *server = NFS_SERVER(dir);
1930         struct nfs_removeargs args = {
1931                 .fh = NFS_FH(dir),
1932                 .name.len = name->len,
1933                 .name.name = name->name,
1934                 .bitmask = server->attr_bitmask,
1935         };
1936         struct nfs_removeres res = {
1937                 .server = server,
1938         };
1939         struct rpc_message msg = {
1940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1941                 .rpc_argp = &args,
1942                 .rpc_resp = &res,
1943         };
1944         int                     status;
1945
1946         nfs_fattr_init(&res.dir_attr);
1947         status = rpc_call_sync(server->client, &msg, 0);
1948         if (status == 0) {
1949                 update_changeattr(dir, &res.cinfo);
1950                 nfs_post_op_update_inode(dir, &res.dir_attr);
1951         }
1952         return status;
1953 }
1954
1955 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1956 {
1957         struct nfs4_exception exception = { };
1958         int err;
1959         do {
1960                 err = nfs4_handle_exception(NFS_SERVER(dir),
1961                                 _nfs4_proc_remove(dir, name),
1962                                 &exception);
1963         } while (exception.retry);
1964         return err;
1965 }
1966
1967 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1968 {
1969         struct nfs_server *server = NFS_SERVER(dir);
1970         struct nfs_removeargs *args = msg->rpc_argp;
1971         struct nfs_removeres *res = msg->rpc_resp;
1972
1973         args->bitmask = server->attr_bitmask;
1974         res->server = server;
1975         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1976 }
1977
1978 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1979 {
1980         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1981
1982         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1983                 return 0;
1984         update_changeattr(dir, &res->cinfo);
1985         nfs_post_op_update_inode(dir, &res->dir_attr);
1986         return 1;
1987 }
1988
1989 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1990                 struct inode *new_dir, struct qstr *new_name)
1991 {
1992         struct nfs_server *server = NFS_SERVER(old_dir);
1993         struct nfs4_rename_arg arg = {
1994                 .old_dir = NFS_FH(old_dir),
1995                 .new_dir = NFS_FH(new_dir),
1996                 .old_name = old_name,
1997                 .new_name = new_name,
1998                 .bitmask = server->attr_bitmask,
1999         };
2000         struct nfs_fattr old_fattr, new_fattr;
2001         struct nfs4_rename_res res = {
2002                 .server = server,
2003                 .old_fattr = &old_fattr,
2004                 .new_fattr = &new_fattr,
2005         };
2006         struct rpc_message msg = {
2007                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2008                 .rpc_argp = &arg,
2009                 .rpc_resp = &res,
2010         };
2011         int                     status;
2012
2013         nfs_fattr_init(res.old_fattr);
2014         nfs_fattr_init(res.new_fattr);
2015         status = rpc_call_sync(server->client, &msg, 0);
2016
2017         if (!status) {
2018                 update_changeattr(old_dir, &res.old_cinfo);
2019                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2020                 update_changeattr(new_dir, &res.new_cinfo);
2021                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2022         }
2023         return status;
2024 }
2025
2026 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2027                 struct inode *new_dir, struct qstr *new_name)
2028 {
2029         struct nfs4_exception exception = { };
2030         int err;
2031         do {
2032                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2033                                 _nfs4_proc_rename(old_dir, old_name,
2034                                         new_dir, new_name),
2035                                 &exception);
2036         } while (exception.retry);
2037         return err;
2038 }
2039
2040 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2041 {
2042         struct nfs_server *server = NFS_SERVER(inode);
2043         struct nfs4_link_arg arg = {
2044                 .fh     = NFS_FH(inode),
2045                 .dir_fh = NFS_FH(dir),
2046                 .name   = name,
2047                 .bitmask = server->attr_bitmask,
2048         };
2049         struct nfs_fattr fattr, dir_attr;
2050         struct nfs4_link_res res = {
2051                 .server = server,
2052                 .fattr = &fattr,
2053                 .dir_attr = &dir_attr,
2054         };
2055         struct rpc_message msg = {
2056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2057                 .rpc_argp = &arg,
2058                 .rpc_resp = &res,
2059         };
2060         int                     status;
2061
2062         nfs_fattr_init(res.fattr);
2063         nfs_fattr_init(res.dir_attr);
2064         status = rpc_call_sync(server->client, &msg, 0);
2065         if (!status) {
2066                 update_changeattr(dir, &res.cinfo);
2067                 nfs_post_op_update_inode(dir, res.dir_attr);
2068                 nfs_post_op_update_inode(inode, res.fattr);
2069         }
2070
2071         return status;
2072 }
2073
2074 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2075 {
2076         struct nfs4_exception exception = { };
2077         int err;
2078         do {
2079                 err = nfs4_handle_exception(NFS_SERVER(inode),
2080                                 _nfs4_proc_link(inode, dir, name),
2081                                 &exception);
2082         } while (exception.retry);
2083         return err;
2084 }
2085
2086 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2087                 struct page *page, unsigned int len, struct iattr *sattr)
2088 {
2089         struct nfs_server *server = NFS_SERVER(dir);
2090         struct nfs_fh fhandle;
2091         struct nfs_fattr fattr, dir_fattr;
2092         struct nfs4_create_arg arg = {
2093                 .dir_fh = NFS_FH(dir),
2094                 .server = server,
2095                 .name = &dentry->d_name,
2096                 .attrs = sattr,
2097                 .ftype = NF4LNK,
2098                 .bitmask = server->attr_bitmask,
2099         };
2100         struct nfs4_create_res res = {
2101                 .server = server,
2102                 .fh = &fhandle,
2103                 .fattr = &fattr,
2104                 .dir_fattr = &dir_fattr,
2105         };
2106         struct rpc_message msg = {
2107                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2108                 .rpc_argp = &arg,
2109                 .rpc_resp = &res,
2110         };
2111         int                     status;
2112
2113         if (len > NFS4_MAXPATHLEN)
2114                 return -ENAMETOOLONG;
2115
2116         arg.u.symlink.pages = &page;
2117         arg.u.symlink.len = len;
2118         nfs_fattr_init(&fattr);
2119         nfs_fattr_init(&dir_fattr);
2120
2121         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2122         if (!status) {
2123                 update_changeattr(dir, &res.dir_cinfo);
2124                 nfs_post_op_update_inode(dir, res.dir_fattr);
2125                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2126         }
2127         return status;
2128 }
2129
2130 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2131                 struct page *page, unsigned int len, struct iattr *sattr)
2132 {
2133         struct nfs4_exception exception = { };
2134         int err;
2135         do {
2136                 err = nfs4_handle_exception(NFS_SERVER(dir),
2137                                 _nfs4_proc_symlink(dir, dentry, page,
2138                                                         len, sattr),
2139                                 &exception);
2140         } while (exception.retry);
2141         return err;
2142 }
2143
2144 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2145                 struct iattr *sattr)
2146 {
2147         struct nfs_server *server = NFS_SERVER(dir);
2148         struct nfs_fh fhandle;
2149         struct nfs_fattr fattr, dir_fattr;
2150         struct nfs4_create_arg arg = {
2151                 .dir_fh = NFS_FH(dir),
2152                 .server = server,
2153                 .name = &dentry->d_name,
2154                 .attrs = sattr,
2155                 .ftype = NF4DIR,
2156                 .bitmask = server->attr_bitmask,
2157         };
2158         struct nfs4_create_res res = {
2159                 .server = server,
2160                 .fh = &fhandle,
2161                 .fattr = &fattr,
2162                 .dir_fattr = &dir_fattr,
2163         };
2164         struct rpc_message msg = {
2165                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2166                 .rpc_argp = &arg,
2167                 .rpc_resp = &res,
2168         };
2169         int                     status;
2170
2171         nfs_fattr_init(&fattr);
2172         nfs_fattr_init(&dir_fattr);
2173
2174         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2175         if (!status) {
2176                 update_changeattr(dir, &res.dir_cinfo);
2177                 nfs_post_op_update_inode(dir, res.dir_fattr);
2178                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2179         }
2180         return status;
2181 }
2182
2183 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2184                 struct iattr *sattr)
2185 {
2186         struct nfs4_exception exception = { };
2187         int err;
2188         do {
2189                 err = nfs4_handle_exception(NFS_SERVER(dir),
2190                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2191                                 &exception);
2192         } while (exception.retry);
2193         return err;
2194 }
2195
2196 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2197                   u64 cookie, struct page *page, unsigned int count, int plus)
2198 {
2199         struct inode            *dir = dentry->d_inode;
2200         struct nfs4_readdir_arg args = {
2201                 .fh = NFS_FH(dir),
2202                 .pages = &page,
2203                 .pgbase = 0,
2204                 .count = count,
2205                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2206         };
2207         struct nfs4_readdir_res res;
2208         struct rpc_message msg = {
2209                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2210                 .rpc_argp = &args,
2211                 .rpc_resp = &res,
2212                 .rpc_cred = cred,
2213         };
2214         int                     status;
2215
2216         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2217                         dentry->d_parent->d_name.name,
2218                         dentry->d_name.name,
2219                         (unsigned long long)cookie);
2220         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2221         res.pgbase = args.pgbase;
2222         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2223         if (status == 0)
2224                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2225
2226         nfs_invalidate_atime(dir);
2227
2228         dprintk("%s: returns %d\n", __FUNCTION__, status);
2229         return status;
2230 }
2231
2232 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2233                   u64 cookie, struct page *page, unsigned int count, int plus)
2234 {
2235         struct nfs4_exception exception = { };
2236         int err;
2237         do {
2238                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2239                                 _nfs4_proc_readdir(dentry, cred, cookie,
2240                                         page, count, plus),
2241                                 &exception);
2242         } while (exception.retry);
2243         return err;
2244 }
2245
2246 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2247                 struct iattr *sattr, dev_t rdev)
2248 {
2249         struct nfs_server *server = NFS_SERVER(dir);
2250         struct nfs_fh fh;
2251         struct nfs_fattr fattr, dir_fattr;
2252         struct nfs4_create_arg arg = {
2253                 .dir_fh = NFS_FH(dir),
2254                 .server = server,
2255                 .name = &dentry->d_name,
2256                 .attrs = sattr,
2257                 .bitmask = server->attr_bitmask,
2258         };
2259         struct nfs4_create_res res = {
2260                 .server = server,
2261                 .fh = &fh,
2262                 .fattr = &fattr,
2263                 .dir_fattr = &dir_fattr,
2264         };
2265         struct rpc_message msg = {
2266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2267                 .rpc_argp = &arg,
2268                 .rpc_resp = &res,
2269         };
2270         int                     status;
2271         int                     mode = sattr->ia_mode;
2272
2273         nfs_fattr_init(&fattr);
2274         nfs_fattr_init(&dir_fattr);
2275
2276         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2277         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2278         if (S_ISFIFO(mode))
2279                 arg.ftype = NF4FIFO;
2280         else if (S_ISBLK(mode)) {
2281                 arg.ftype = NF4BLK;
2282                 arg.u.device.specdata1 = MAJOR(rdev);
2283                 arg.u.device.specdata2 = MINOR(rdev);
2284         }
2285         else if (S_ISCHR(mode)) {
2286                 arg.ftype = NF4CHR;
2287                 arg.u.device.specdata1 = MAJOR(rdev);
2288                 arg.u.device.specdata2 = MINOR(rdev);
2289         }
2290         else
2291                 arg.ftype = NF4SOCK;
2292
2293         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2294         if (status == 0) {
2295                 update_changeattr(dir, &res.dir_cinfo);
2296                 nfs_post_op_update_inode(dir, res.dir_fattr);
2297                 status = nfs_instantiate(dentry, &fh, &fattr);
2298         }
2299         return status;
2300 }
2301
2302 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2303                 struct iattr *sattr, dev_t rdev)
2304 {
2305         struct nfs4_exception exception = { };
2306         int err;
2307         do {
2308                 err = nfs4_handle_exception(NFS_SERVER(dir),
2309                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2310                                 &exception);
2311         } while (exception.retry);
2312         return err;
2313 }
2314
2315 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2316                  struct nfs_fsstat *fsstat)
2317 {
2318         struct nfs4_statfs_arg args = {
2319                 .fh = fhandle,
2320                 .bitmask = server->attr_bitmask,
2321         };
2322         struct rpc_message msg = {
2323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2324                 .rpc_argp = &args,
2325                 .rpc_resp = fsstat,
2326         };
2327
2328         nfs_fattr_init(fsstat->fattr);
2329         return rpc_call_sync(server->client, &msg, 0);
2330 }
2331
2332 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2333 {
2334         struct nfs4_exception exception = { };
2335         int err;
2336         do {
2337                 err = nfs4_handle_exception(server,
2338                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2339                                 &exception);
2340         } while (exception.retry);
2341         return err;
2342 }
2343
2344 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2345                 struct nfs_fsinfo *fsinfo)
2346 {
2347         struct nfs4_fsinfo_arg args = {
2348                 .fh = fhandle,
2349                 .bitmask = server->attr_bitmask,
2350         };
2351         struct rpc_message msg = {
2352                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2353                 .rpc_argp = &args,
2354                 .rpc_resp = fsinfo,
2355         };
2356
2357         return rpc_call_sync(server->client, &msg, 0);
2358 }
2359
2360 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2361 {
2362         struct nfs4_exception exception = { };
2363         int err;
2364
2365         do {
2366                 err = nfs4_handle_exception(server,
2367                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2368                                 &exception);
2369         } while (exception.retry);
2370         return err;
2371 }
2372
2373 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2374 {
2375         nfs_fattr_init(fsinfo->fattr);
2376         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2377 }
2378
2379 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2380                 struct nfs_pathconf *pathconf)
2381 {
2382         struct nfs4_pathconf_arg args = {
2383                 .fh = fhandle,
2384                 .bitmask = server->attr_bitmask,
2385         };
2386         struct rpc_message msg = {
2387                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2388                 .rpc_argp = &args,
2389                 .rpc_resp = pathconf,
2390         };
2391
2392         /* None of the pathconf attributes are mandatory to implement */
2393         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2394                 memset(pathconf, 0, sizeof(*pathconf));
2395                 return 0;
2396         }
2397
2398         nfs_fattr_init(pathconf->fattr);
2399         return rpc_call_sync(server->client, &msg, 0);
2400 }
2401
2402 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2403                 struct nfs_pathconf *pathconf)
2404 {
2405         struct nfs4_exception exception = { };
2406         int err;
2407
2408         do {
2409                 err = nfs4_handle_exception(server,
2410                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2411                                 &exception);
2412         } while (exception.retry);
2413         return err;
2414 }
2415
2416 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2417 {
2418         struct nfs_server *server = NFS_SERVER(data->inode);
2419
2420         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2421                 rpc_restart_call(task);
2422                 return -EAGAIN;
2423         }
2424
2425         nfs_invalidate_atime(data->inode);
2426         if (task->tk_status > 0)
2427                 renew_lease(server, data->timestamp);
2428         return 0;
2429 }
2430
2431 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2432 {
2433         data->timestamp   = jiffies;
2434         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2435 }
2436
2437 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2438 {
2439         struct inode *inode = data->inode;
2440
2441         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2442                 rpc_restart_call(task);
2443                 return -EAGAIN;
2444         }
2445         if (task->tk_status >= 0) {
2446                 renew_lease(NFS_SERVER(inode), data->timestamp);
2447                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2448         }
2449         return 0;
2450 }
2451
2452 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2453 {
2454         struct nfs_server *server = NFS_SERVER(data->inode);
2455
2456         data->args.bitmask = server->attr_bitmask;
2457         data->res.server = server;
2458         data->timestamp   = jiffies;
2459
2460         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2461 }
2462
2463 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2464 {
2465         struct inode *inode = data->inode;
2466
2467         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2468                 rpc_restart_call(task);
2469                 return -EAGAIN;
2470         }
2471         nfs_refresh_inode(inode, data->res.fattr);
2472         return 0;
2473 }
2474
2475 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2476 {
2477         struct nfs_server *server = NFS_SERVER(data->inode);
2478
2479         data->args.bitmask = server->attr_bitmask;
2480         data->res.server = server;
2481         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2482 }
2483
2484 /*
2485  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2486  * standalone procedure for queueing an asynchronous RENEW.
2487  */
2488 static void nfs4_renew_done(struct rpc_task *task, void *data)
2489 {
2490         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2491         unsigned long timestamp = (unsigned long)data;
2492
2493         if (task->tk_status < 0) {
2494                 switch (task->tk_status) {
2495                         case -NFS4ERR_STALE_CLIENTID:
2496                         case -NFS4ERR_EXPIRED:
2497                         case -NFS4ERR_CB_PATH_DOWN:
2498                                 nfs4_schedule_state_recovery(clp);
2499                 }
2500                 return;
2501         }
2502         spin_lock(&clp->cl_lock);
2503         if (time_before(clp->cl_last_renewal,timestamp))
2504                 clp->cl_last_renewal = timestamp;
2505         spin_unlock(&clp->cl_lock);
2506 }
2507
2508 static const struct rpc_call_ops nfs4_renew_ops = {
2509         .rpc_call_done = nfs4_renew_done,
2510 };
2511
2512 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2513 {
2514         struct rpc_message msg = {
2515                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2516                 .rpc_argp       = clp,
2517                 .rpc_cred       = cred,
2518         };
2519
2520         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2521                         &nfs4_renew_ops, (void *)jiffies);
2522 }
2523
2524 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2525 {
2526         struct rpc_message msg = {
2527                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2528                 .rpc_argp       = clp,
2529                 .rpc_cred       = cred,
2530         };
2531         unsigned long now = jiffies;
2532         int status;
2533
2534         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2535         if (status < 0)
2536                 return status;
2537         spin_lock(&clp->cl_lock);
2538         if (time_before(clp->cl_last_renewal,now))
2539                 clp->cl_last_renewal = now;
2540         spin_unlock(&clp->cl_lock);
2541         return 0;
2542 }
2543
2544 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2545 {
2546         return (server->caps & NFS_CAP_ACLS)
2547                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2548                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2549 }
2550
2551 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2552  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2553  * the stack.
2554  */
2555 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2556
2557 static void buf_to_pages(const void *buf, size_t buflen,
2558                 struct page **pages, unsigned int *pgbase)
2559 {
2560         const void *p = buf;
2561
2562         *pgbase = offset_in_page(buf);
2563         p -= *pgbase;
2564         while (p < buf + buflen) {
2565                 *(pages++) = virt_to_page(p);
2566                 p += PAGE_CACHE_SIZE;
2567         }
2568 }
2569
2570 struct nfs4_cached_acl {
2571         int cached;
2572         size_t len;
2573         char data[0];
2574 };
2575
2576 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2577 {
2578         struct nfs_inode *nfsi = NFS_I(inode);
2579
2580         spin_lock(&inode->i_lock);
2581         kfree(nfsi->nfs4_acl);
2582         nfsi->nfs4_acl = acl;
2583         spin_unlock(&inode->i_lock);
2584 }
2585
2586 static void nfs4_zap_acl_attr(struct inode *inode)
2587 {
2588         nfs4_set_cached_acl(inode, NULL);
2589 }
2590
2591 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2592 {
2593         struct nfs_inode *nfsi = NFS_I(inode);
2594         struct nfs4_cached_acl *acl;
2595         int ret = -ENOENT;
2596
2597         spin_lock(&inode->i_lock);
2598         acl = nfsi->nfs4_acl;
2599         if (acl == NULL)
2600                 goto out;
2601         if (buf == NULL) /* user is just asking for length */
2602                 goto out_len;
2603         if (acl->cached == 0)
2604                 goto out;
2605         ret = -ERANGE; /* see getxattr(2) man page */
2606         if (acl->len > buflen)
2607                 goto out;
2608         memcpy(buf, acl->data, acl->len);
2609 out_len:
2610         ret = acl->len;
2611 out:
2612         spin_unlock(&inode->i_lock);
2613         return ret;
2614 }
2615
2616 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2617 {
2618         struct nfs4_cached_acl *acl;
2619
2620         if (buf && acl_len <= PAGE_SIZE) {
2621                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2622                 if (acl == NULL)
2623                         goto out;
2624                 acl->cached = 1;
2625                 memcpy(acl->data, buf, acl_len);
2626         } else {
2627                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2628                 if (acl == NULL)
2629                         goto out;
2630                 acl->cached = 0;
2631         }
2632         acl->len = acl_len;
2633 out:
2634         nfs4_set_cached_acl(inode, acl);
2635 }
2636
2637 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2638 {
2639         struct page *pages[NFS4ACL_MAXPAGES];
2640         struct nfs_getaclargs args = {
2641                 .fh = NFS_FH(inode),
2642                 .acl_pages = pages,
2643                 .acl_len = buflen,
2644         };
2645         size_t resp_len = buflen;
2646         void *resp_buf;
2647         struct rpc_message msg = {
2648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2649                 .rpc_argp = &args,
2650                 .rpc_resp = &resp_len,
2651         };
2652         struct page *localpage = NULL;
2653         int ret;
2654
2655         if (buflen < PAGE_SIZE) {
2656                 /* As long as we're doing a round trip to the server anyway,
2657                  * let's be prepared for a page of acl data. */
2658                 localpage = alloc_page(GFP_KERNEL);
2659                 resp_buf = page_address(localpage);
2660                 if (localpage == NULL)
2661                         return -ENOMEM;
2662                 args.acl_pages[0] = localpage;
2663                 args.acl_pgbase = 0;
2664                 resp_len = args.acl_len = PAGE_SIZE;
2665         } else {
2666                 resp_buf = buf;
2667                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2668         }
2669         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2670         if (ret)
2671                 goto out_free;
2672         if (resp_len > args.acl_len)
2673                 nfs4_write_cached_acl(inode, NULL, resp_len);
2674         else
2675                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2676         if (buf) {
2677                 ret = -ERANGE;
2678                 if (resp_len > buflen)
2679                         goto out_free;
2680                 if (localpage)
2681                         memcpy(buf, resp_buf, resp_len);
2682         }
2683         ret = resp_len;
2684 out_free:
2685         if (localpage)
2686                 __free_page(localpage);
2687         return ret;
2688 }
2689
2690 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2691 {
2692         struct nfs4_exception exception = { };
2693         ssize_t ret;
2694         do {
2695                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2696                 if (ret >= 0)
2697                         break;
2698                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2699         } while (exception.retry);
2700         return ret;
2701 }
2702
2703 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2704 {
2705         struct nfs_server *server = NFS_SERVER(inode);
2706         int ret;
2707
2708         if (!nfs4_server_supports_acls(server))
2709                 return -EOPNOTSUPP;
2710         ret = nfs_revalidate_inode(server, inode);
2711         if (ret < 0)
2712                 return ret;
2713         ret = nfs4_read_cached_acl(inode, buf, buflen);
2714         if (ret != -ENOENT)
2715                 return ret;
2716         return nfs4_get_acl_uncached(inode, buf, buflen);
2717 }
2718
2719 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2720 {
2721         struct nfs_server *server = NFS_SERVER(inode);
2722         struct page *pages[NFS4ACL_MAXPAGES];
2723         struct nfs_setaclargs arg = {
2724                 .fh             = NFS_FH(inode),
2725                 .acl_pages      = pages,
2726                 .acl_len        = buflen,
2727         };
2728         struct rpc_message msg = {
2729                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2730                 .rpc_argp       = &arg,
2731                 .rpc_resp       = NULL,
2732         };
2733         int ret;
2734
2735         if (!nfs4_server_supports_acls(server))
2736                 return -EOPNOTSUPP;
2737         nfs_inode_return_delegation(inode);
2738         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2739         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2740         nfs_zap_caches(inode);
2741         return ret;
2742 }
2743
2744 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2745 {
2746         struct nfs4_exception exception = { };
2747         int err;
2748         do {
2749                 err = nfs4_handle_exception(NFS_SERVER(inode),
2750                                 __nfs4_proc_set_acl(inode, buf, buflen),
2751                                 &exception);
2752         } while (exception.retry);
2753         return err;
2754 }
2755
2756 static int
2757 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2758 {
2759         struct nfs_client *clp = server->nfs_client;
2760
2761         if (!clp || task->tk_status >= 0)
2762                 return 0;
2763         switch(task->tk_status) {
2764                 case -NFS4ERR_STALE_CLIENTID:
2765                 case -NFS4ERR_STALE_STATEID:
2766                 case -NFS4ERR_EXPIRED:
2767                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2768                         nfs4_schedule_state_recovery(clp);
2769                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2770                                 rpc_wake_up_task(task);
2771                         task->tk_status = 0;
2772                         return -EAGAIN;
2773                 case -NFS4ERR_DELAY:
2774                         nfs_inc_server_stats((struct nfs_server *) server,
2775                                                 NFSIOS_DELAY);
2776                 case -NFS4ERR_GRACE:
2777                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2778                         task->tk_status = 0;
2779                         return -EAGAIN;
2780                 case -NFS4ERR_OLD_STATEID:
2781                         task->tk_status = 0;
2782                         return -EAGAIN;
2783         }
2784         task->tk_status = nfs4_map_errors(task->tk_status);
2785         return 0;
2786 }
2787
2788 static int nfs4_wait_bit_interruptible(void *word)
2789 {
2790         if (signal_pending(current))
2791                 return -ERESTARTSYS;
2792         schedule();
2793         return 0;
2794 }
2795
2796 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2797 {
2798         sigset_t oldset;
2799         int res;
2800
2801         might_sleep();
2802
2803         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2804
2805         rpc_clnt_sigmask(clnt, &oldset);
2806         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2807                         nfs4_wait_bit_interruptible,
2808                         TASK_INTERRUPTIBLE);
2809         rpc_clnt_sigunmask(clnt, &oldset);
2810
2811         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2812         return res;
2813 }
2814
2815 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2816 {
2817         sigset_t oldset;
2818         int res = 0;
2819
2820         might_sleep();
2821
2822         if (*timeout <= 0)
2823                 *timeout = NFS4_POLL_RETRY_MIN;
2824         if (*timeout > NFS4_POLL_RETRY_MAX)
2825                 *timeout = NFS4_POLL_RETRY_MAX;
2826         rpc_clnt_sigmask(clnt, &oldset);
2827         if (clnt->cl_intr) {
2828                 schedule_timeout_interruptible(*timeout);
2829                 if (signalled())
2830                         res = -ERESTARTSYS;
2831         } else
2832                 schedule_timeout_uninterruptible(*timeout);
2833         rpc_clnt_sigunmask(clnt, &oldset);
2834         *timeout <<= 1;
2835         return res;
2836 }
2837
2838 /* This is the error handling routine for processes that are allowed
2839  * to sleep.
2840  */
2841 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2842 {
2843         struct nfs_client *clp = server->nfs_client;
2844         int ret = errorcode;
2845
2846         exception->retry = 0;
2847         switch(errorcode) {
2848                 case 0:
2849                         return 0;
2850                 case -NFS4ERR_STALE_CLIENTID:
2851                 case -NFS4ERR_STALE_STATEID:
2852                 case -NFS4ERR_EXPIRED:
2853                         nfs4_schedule_state_recovery(clp);
2854                         ret = nfs4_wait_clnt_recover(server->client, clp);
2855                         if (ret == 0)
2856                                 exception->retry = 1;
2857                         break;
2858                 case -NFS4ERR_FILE_OPEN:
2859                 case -NFS4ERR_GRACE:
2860                 case -NFS4ERR_DELAY:
2861                         ret = nfs4_delay(server->client, &exception->timeout);
2862                         if (ret != 0)
2863                                 break;
2864                 case -NFS4ERR_OLD_STATEID:
2865                         exception->retry = 1;
2866         }
2867         /* We failed to handle the error */
2868         return nfs4_map_errors(ret);
2869 }
2870
2871 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2872 {
2873         nfs4_verifier sc_verifier;
2874         struct nfs4_setclientid setclientid = {
2875                 .sc_verifier = &sc_verifier,
2876                 .sc_prog = program,
2877         };
2878         struct rpc_message msg = {
2879                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2880                 .rpc_argp = &setclientid,
2881                 .rpc_resp = clp,
2882                 .rpc_cred = cred,
2883         };
2884         __be32 *p;
2885         int loop = 0;
2886         int status;
2887
2888         p = (__be32*)sc_verifier.data;
2889         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2890         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2891
2892         for(;;) {
2893                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2894                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2895                                 clp->cl_ipaddr,
2896                                 rpc_peeraddr2str(clp->cl_rpcclient,
2897                                                         RPC_DISPLAY_ADDR),
2898                                 rpc_peeraddr2str(clp->cl_rpcclient,
2899                                                         RPC_DISPLAY_PROTO),
2900                                 cred->cr_ops->cr_name,
2901                                 clp->cl_id_uniquifier);
2902                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2903                                 sizeof(setclientid.sc_netid),
2904                                 rpc_peeraddr2str(clp->cl_rpcclient,
2905                                                         RPC_DISPLAY_NETID));
2906                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2907                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2908                                 clp->cl_ipaddr, port >> 8, port & 255);
2909
2910                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2911                 if (status != -NFS4ERR_CLID_INUSE)
2912                         break;
2913                 if (signalled())
2914                         break;
2915                 if (loop++ & 1)
2916                         ssleep(clp->cl_lease_time + 1);
2917                 else
2918                         if (++clp->cl_id_uniquifier == 0)
2919                                 break;
2920         }
2921         return status;
2922 }
2923
2924 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2925 {
2926         struct nfs_fsinfo fsinfo;
2927         struct rpc_message msg = {
2928                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2929                 .rpc_argp = clp,
2930                 .rpc_resp = &fsinfo,
2931                 .rpc_cred = cred,
2932         };
2933         unsigned long now;
2934         int status;
2935
2936         now = jiffies;
2937         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2938         if (status == 0) {
2939                 spin_lock(&clp->cl_lock);
2940                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2941                 clp->cl_last_renewal = now;
2942                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2943                 spin_unlock(&clp->cl_lock);
2944         }
2945         return status;
2946 }
2947
2948 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2949 {
2950         long timeout;
2951         int err;
2952         do {
2953                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2954                 switch (err) {
2955                         case 0:
2956                                 return err;
2957                         case -NFS4ERR_RESOURCE:
2958                                 /* The IBM lawyers misread another document! */
2959                         case -NFS4ERR_DELAY:
2960                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2961                 }
2962         } while (err == 0);
2963         return err;
2964 }
2965
2966 struct nfs4_delegreturndata {
2967         struct nfs4_delegreturnargs args;
2968         struct nfs4_delegreturnres res;
2969         struct nfs_fh fh;
2970         nfs4_stateid stateid;
2971         unsigned long timestamp;
2972         struct nfs_fattr fattr;
2973         int rpc_status;
2974 };
2975
2976 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2977 {
2978         struct nfs4_delegreturndata *data = calldata;
2979         data->rpc_status = task->tk_status;
2980         if (data->rpc_status == 0)
2981                 renew_lease(data->res.server, data->timestamp);
2982 }
2983
2984 static void nfs4_delegreturn_release(void *calldata)
2985 {
2986         kfree(calldata);
2987 }
2988
2989 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2990         .rpc_call_done = nfs4_delegreturn_done,
2991         .rpc_release = nfs4_delegreturn_release,
2992 };
2993
2994 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
2995 {
2996         struct nfs4_delegreturndata *data;
2997         struct nfs_server *server = NFS_SERVER(inode);
2998         struct rpc_task *task;
2999         struct rpc_message msg = {
3000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3001                 .rpc_cred = cred,
3002         };
3003         struct rpc_task_setup task_setup_data = {
3004                 .rpc_client = server->client,
3005                 .rpc_message = &msg,
3006                 .callback_ops = &nfs4_delegreturn_ops,
3007                 .flags = RPC_TASK_ASYNC,
3008         };
3009         int status = 0;
3010
3011         data = kmalloc(sizeof(*data), GFP_KERNEL);
3012         if (data == NULL)
3013                 return -ENOMEM;
3014         data->args.fhandle = &data->fh;
3015         data->args.stateid = &data->stateid;
3016         data->args.bitmask = server->attr_bitmask;
3017         nfs_copy_fh(&data->fh, NFS_FH(inode));
3018         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3019         data->res.fattr = &data->fattr;
3020         data->res.server = server;
3021         nfs_fattr_init(data->res.fattr);
3022         data->timestamp = jiffies;
3023         data->rpc_status = 0;
3024
3025         task_setup_data.callback_data = data;
3026         msg.rpc_argp = &data->args,
3027         msg.rpc_resp = &data->res,
3028         task = rpc_run_task(&task_setup_data);
3029         if (IS_ERR(task))
3030                 return PTR_ERR(task);
3031         if (!issync)
3032                 goto out;
3033         status = nfs4_wait_for_completion_rpc_task(task);
3034         if (status != 0)
3035                 goto out;
3036         status = data->rpc_status;
3037         if (status != 0)
3038                 goto out;
3039         nfs_refresh_inode(inode, &data->fattr);
3040 out:
3041         rpc_put_task(task);
3042         return status;
3043 }
3044
3045 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3046 {
3047         struct nfs_server *server = NFS_SERVER(inode);
3048         struct nfs4_exception exception = { };
3049         int err;
3050         do {
3051                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3052                 switch (err) {
3053                         case -NFS4ERR_STALE_STATEID:
3054                         case -NFS4ERR_EXPIRED:
3055                         case 0:
3056                                 return 0;
3057                 }
3058                 err = nfs4_handle_exception(server, err, &exception);
3059         } while (exception.retry);
3060         return err;
3061 }
3062
3063 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3064 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3065
3066 /*
3067  * sleep, with exponential backoff, and retry the LOCK operation.
3068  */
3069 static unsigned long
3070 nfs4_set_lock_task_retry(unsigned long timeout)
3071 {
3072         schedule_timeout_interruptible(timeout);
3073         timeout <<= 1;
3074         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3075                 return NFS4_LOCK_MAXTIMEOUT;
3076         return timeout;
3077 }
3078
3079 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3080 {
3081         struct inode *inode = state->inode;
3082         struct nfs_server *server = NFS_SERVER(inode);
3083         struct nfs_client *clp = server->nfs_client;
3084         struct nfs_lockt_args arg = {
3085                 .fh = NFS_FH(inode),
3086                 .fl = request,
3087         };
3088         struct nfs_lockt_res res = {
3089                 .denied = request,
3090         };
3091         struct rpc_message msg = {
3092                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3093                 .rpc_argp       = &arg,
3094                 .rpc_resp       = &res,
3095                 .rpc_cred       = state->owner->so_cred,
3096         };
3097         struct nfs4_lock_state *lsp;
3098         int status;
3099
3100         down_read(&clp->cl_sem);
3101         arg.lock_owner.clientid = clp->cl_clientid;
3102         status = nfs4_set_lock_state(state, request);
3103         if (status != 0)
3104                 goto out;
3105         lsp = request->fl_u.nfs4_fl.owner;
3106         arg.lock_owner.id = lsp->ls_id.id;
3107         status = rpc_call_sync(server->client, &msg, 0);
3108         switch (status) {
3109                 case 0:
3110                         request->fl_type = F_UNLCK;
3111                         break;
3112                 case -NFS4ERR_DENIED:
3113                         status = 0;
3114         }
3115         request->fl_ops->fl_release_private(request);
3116 out:
3117         up_read(&clp->cl_sem);
3118         return status;
3119 }
3120
3121 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3122 {
3123         struct nfs4_exception exception = { };
3124         int err;
3125
3126         do {
3127                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3128                                 _nfs4_proc_getlk(state, cmd, request),
3129                                 &exception);
3130         } while (exception.retry);
3131         return err;
3132 }
3133
3134 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3135 {
3136         int res = 0;
3137         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3138                 case FL_POSIX:
3139                         res = posix_lock_file_wait(file, fl);
3140                         break;
3141                 case FL_FLOCK:
3142                         res = flock_lock_file_wait(file, fl);
3143                         break;
3144                 default:
3145                         BUG();
3146         }
3147         return res;
3148 }
3149
3150 struct nfs4_unlockdata {
3151         struct nfs_locku_args arg;
3152         struct nfs_locku_res res;
3153         struct nfs4_lock_state *lsp;
3154         struct nfs_open_context *ctx;
3155         struct file_lock fl;
3156         const struct nfs_server *server;
3157         unsigned long timestamp;
3158 };
3159
3160 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3161                 struct nfs_open_context *ctx,
3162                 struct nfs4_lock_state *lsp,
3163                 struct nfs_seqid *seqid)
3164 {
3165         struct nfs4_unlockdata *p;
3166         struct inode *inode = lsp->ls_state->inode;
3167
3168         p = kmalloc(sizeof(*p), GFP_KERNEL);
3169         if (p == NULL)
3170                 return NULL;
3171         p->arg.fh = NFS_FH(inode);
3172         p->arg.fl = &p->fl;
3173         p->arg.seqid = seqid;
3174         p->arg.stateid = &lsp->ls_stateid;
3175         p->lsp = lsp;
3176         atomic_inc(&lsp->ls_count);
3177         /* Ensure we don't close file until we're done freeing locks! */
3178         p->ctx = get_nfs_open_context(ctx);
3179         memcpy(&p->fl, fl, sizeof(p->fl));
3180         p->server = NFS_SERVER(inode);
3181         return p;
3182 }
3183
3184 static void nfs4_locku_release_calldata(void *data)
3185 {
3186         struct nfs4_unlockdata *calldata = data;
3187         nfs_free_seqid(calldata->arg.seqid);
3188         nfs4_put_lock_state(calldata->lsp);
3189         put_nfs_open_context(calldata->ctx);
3190         kfree(calldata);
3191 }
3192
3193 static void nfs4_locku_done(struct rpc_task *task, void *data)
3194 {
3195         struct nfs4_unlockdata *calldata = data;
3196
3197         if (RPC_ASSASSINATED(task))
3198                 return;
3199         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3200         switch (task->tk_status) {
3201                 case 0:
3202                         memcpy(calldata->lsp->ls_stateid.data,
3203                                         calldata->res.stateid.data,
3204                                         sizeof(calldata->lsp->ls_stateid.data));
3205                         renew_lease(calldata->server, calldata->timestamp);
3206                         break;
3207                 case -NFS4ERR_STALE_STATEID:
3208                 case -NFS4ERR_EXPIRED:
3209                         break;
3210                 default:
3211                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3212                                 rpc_restart_call(task);
3213         }
3214 }
3215
3216 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3217 {
3218         struct nfs4_unlockdata *calldata = data;
3219
3220         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3221                 return;
3222         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3223                 /* Note: exit _without_ running nfs4_locku_done */
3224                 task->tk_action = NULL;
3225                 return;
3226         }
3227         calldata->timestamp = jiffies;
3228         rpc_call_start(task);
3229 }
3230
3231 static const struct rpc_call_ops nfs4_locku_ops = {
3232         .rpc_call_prepare = nfs4_locku_prepare,
3233         .rpc_call_done = nfs4_locku_done,
3234         .rpc_release = nfs4_locku_release_calldata,
3235 };
3236
3237 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3238                 struct nfs_open_context *ctx,
3239                 struct nfs4_lock_state *lsp,
3240                 struct nfs_seqid *seqid)
3241 {
3242         struct nfs4_unlockdata *data;
3243         struct rpc_message msg = {
3244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3245                 .rpc_cred = ctx->cred,
3246         };
3247         struct rpc_task_setup task_setup_data = {
3248                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3249                 .rpc_message = &msg,
3250                 .callback_ops = &nfs4_locku_ops,
3251                 .flags = RPC_TASK_ASYNC,
3252         };
3253
3254         /* Ensure this is an unlock - when canceling a lock, the
3255          * canceled lock is passed in, and it won't be an unlock.
3256          */
3257         fl->fl_type = F_UNLCK;
3258
3259         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3260         if (data == NULL) {
3261                 nfs_free_seqid(seqid);
3262                 return ERR_PTR(-ENOMEM);
3263         }
3264
3265         msg.rpc_argp = &data->arg,
3266         msg.rpc_resp = &data->res,
3267         task_setup_data.callback_data = data;
3268         return rpc_run_task(&task_setup_data);
3269 }
3270
3271 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3272 {
3273         struct nfs_seqid *seqid;
3274         struct nfs4_lock_state *lsp;
3275         struct rpc_task *task;
3276         int status = 0;
3277
3278         status = nfs4_set_lock_state(state, request);
3279         /* Unlock _before_ we do the RPC call */
3280         request->fl_flags |= FL_EXISTS;
3281         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3282                 goto out;
3283         if (status != 0)
3284                 goto out;
3285         /* Is this a delegated lock? */
3286         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3287                 goto out;
3288         lsp = request->fl_u.nfs4_fl.owner;
3289         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3290         status = -ENOMEM;
3291         if (seqid == NULL)
3292                 goto out;
3293         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3294         status = PTR_ERR(task);
3295         if (IS_ERR(task))
3296                 goto out;
3297         status = nfs4_wait_for_completion_rpc_task(task);
3298         rpc_put_task(task);
3299 out:
3300         return status;
3301 }
3302
3303 struct nfs4_lockdata {
3304         struct nfs_lock_args arg;
3305         struct nfs_lock_res res;
3306         struct nfs4_lock_state *lsp;
3307         struct nfs_open_context *ctx;
3308         struct file_lock fl;
3309         unsigned long timestamp;
3310         int rpc_status;
3311         int cancelled;
3312 };
3313
3314 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3315                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3316 {
3317         struct nfs4_lockdata *p;
3318         struct inode *inode = lsp->ls_state->inode;
3319         struct nfs_server *server = NFS_SERVER(inode);
3320
3321         p = kzalloc(sizeof(*p), GFP_KERNEL);
3322         if (p == NULL)
3323                 return NULL;
3324
3325         p->arg.fh = NFS_FH(inode);
3326         p->arg.fl = &p->fl;
3327         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3328         if (p->arg.open_seqid == NULL)
3329                 goto out_free;
3330         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3331         if (p->arg.lock_seqid == NULL)
3332                 goto out_free_seqid;
3333         p->arg.lock_stateid = &lsp->ls_stateid;
3334         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3335         p->arg.lock_owner.id = lsp->ls_id.id;
3336         p->lsp = lsp;
3337         atomic_inc(&lsp->ls_count);
3338         p->ctx = get_nfs_open_context(ctx);
3339         memcpy(&p->fl, fl, sizeof(p->fl));
3340         return p;
3341 out_free_seqid:
3342         nfs_free_seqid(p->arg.open_seqid);
3343 out_free:
3344         kfree(p);
3345         return NULL;
3346 }
3347
3348 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3349 {
3350         struct nfs4_lockdata *data = calldata;
3351         struct nfs4_state *state = data->lsp->ls_state;
3352
3353         dprintk("%s: begin!\n", __FUNCTION__);
3354         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3355                 return;
3356         /* Do we need to do an open_to_lock_owner? */
3357         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3358                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3359                         return;
3360                 data->arg.open_stateid = &state->stateid;
3361                 data->arg.new_lock_owner = 1;
3362         } else
3363                 data->arg.new_lock_owner = 0;
3364         data->timestamp = jiffies;
3365         rpc_call_start(task);
3366         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3367 }
3368
3369 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3370 {
3371         struct nfs4_lockdata *data = calldata;
3372
3373         dprintk("%s: begin!\n", __FUNCTION__);
3374
3375         data->rpc_status = task->tk_status;
3376         if (RPC_ASSASSINATED(task))
3377                 goto out;
3378         if (data->arg.new_lock_owner != 0) {
3379                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3380                 if (data->rpc_status == 0)
3381                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3382                 else
3383                         goto out;
3384         }
3385         if (data->rpc_status == 0) {
3386                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3387                                         sizeof(data->lsp->ls_stateid.data));
3388                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3389                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3390         }
3391         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3392 out:
3393         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3394 }
3395
3396 static void nfs4_lock_release(void *calldata)
3397 {
3398         struct nfs4_lockdata *data = calldata;
3399
3400         dprintk("%s: begin!\n", __FUNCTION__);
3401         nfs_free_seqid(data->arg.open_seqid);
3402         if (data->cancelled != 0) {
3403                 struct rpc_task *task;
3404                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3405                                 data->arg.lock_seqid);
3406                 if (!IS_ERR(task))
3407                         rpc_put_task(task);
3408                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3409         } else
3410                 nfs_free_seqid(data->arg.lock_seqid);
3411         nfs4_put_lock_state(data->lsp);
3412         put_nfs_open_context(data->ctx);
3413         kfree(data);
3414         dprintk("%s: done!\n", __FUNCTION__);
3415 }
3416
3417 static const struct rpc_call_ops nfs4_lock_ops = {
3418         .rpc_call_prepare = nfs4_lock_prepare,
3419         .rpc_call_done = nfs4_lock_done,
3420         .rpc_release = nfs4_lock_release,
3421 };
3422
3423 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3424 {
3425         struct nfs4_lockdata *data;
3426         struct rpc_task *task;
3427         struct rpc_message msg = {
3428                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3429                 .rpc_cred = state->owner->so_cred,
3430         };
3431         struct rpc_task_setup task_setup_data = {
3432                 .rpc_client = NFS_CLIENT(state->inode),
3433                 .rpc_message = &msg,
3434                 .callback_ops = &nfs4_lock_ops,
3435                 .flags = RPC_TASK_ASYNC,
3436         };
3437         int ret;
3438
3439         dprintk("%s: begin!\n", __FUNCTION__);
3440         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3441                         fl->fl_u.nfs4_fl.owner);
3442         if (data == NULL)
3443                 return -ENOMEM;
3444         if (IS_SETLKW(cmd))
3445                 data->arg.block = 1;
3446         if (reclaim != 0)
3447                 data->arg.reclaim = 1;
3448         msg.rpc_argp = &data->arg,
3449         msg.rpc_resp = &data->res,
3450         task_setup_data.callback_data = data;
3451         task = rpc_run_task(&task_setup_data);
3452         if (IS_ERR(task))
3453                 return PTR_ERR(task);
3454         ret = nfs4_wait_for_completion_rpc_task(task);
3455         if (ret == 0) {
3456                 ret = data->rpc_status;
3457                 if (ret == -NFS4ERR_DENIED)
3458                         ret = -EAGAIN;
3459         } else
3460                 data->cancelled = 1;
3461         rpc_put_task(task);
3462         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3463         return ret;
3464 }
3465
3466 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3467 {
3468         struct nfs_server *server = NFS_SERVER(state->inode);
3469         struct nfs4_exception exception = { };
3470         int err;
3471
3472         do {
3473                 /* Cache the lock if possible... */
3474                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3475                         return 0;
3476                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3477                 if (err != -NFS4ERR_DELAY)
3478                         break;
3479                 nfs4_handle_exception(server, err, &exception);
3480         } while (exception.retry);
3481         return err;
3482 }
3483
3484 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3485 {
3486         struct nfs_server *server = NFS_SERVER(state->inode);
3487         struct nfs4_exception exception = { };
3488         int err;
3489
3490         err = nfs4_set_lock_state(state, request);
3491         if (err != 0)
3492                 return err;
3493         do {
3494                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3495                         return 0;
3496                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3497                 if (err != -NFS4ERR_DELAY)
3498                         break;
3499                 nfs4_handle_exception(server, err, &exception);
3500         } while (exception.retry);
3501         return err;
3502 }
3503
3504 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3505 {
3506         struct nfs_client *clp = state->owner->so_client;
3507         unsigned char fl_flags = request->fl_flags;
3508         int status;
3509
3510         /* Is this a delegated open? */
3511         status = nfs4_set_lock_state(state, request);
3512         if (status != 0)
3513                 goto out;
3514         request->fl_flags |= FL_ACCESS;
3515         status = do_vfs_lock(request->fl_file, request);
3516         if (status < 0)
3517                 goto out;
3518         down_read(&clp->cl_sem);
3519         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3520                 struct nfs_inode *nfsi = NFS_I(state->inode);
3521                 /* Yes: cache locks! */
3522                 down_read(&nfsi->rwsem);
3523                 /* ...but avoid races with delegation recall... */
3524                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3525                         request->fl_flags = fl_flags & ~FL_SLEEP;
3526                         status = do_vfs_lock(request->fl_file, request);
3527                         up_read(&nfsi->rwsem);
3528                         goto out_unlock;
3529                 }
3530                 up_read(&nfsi->rwsem);
3531         }
3532         status = _nfs4_do_setlk(state, cmd, request, 0);
3533         if (status != 0)
3534                 goto out_unlock;
3535         /* Note: we always want to sleep here! */
3536         request->fl_flags = fl_flags | FL_SLEEP;
3537         if (do_vfs_lock(request->fl_file, request) < 0)
3538                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3539 out_unlock:
3540         up_read(&clp->cl_sem);
3541 out:
3542         request->fl_flags = fl_flags;
3543         return status;
3544 }
3545
3546 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3547 {
3548         struct nfs4_exception exception = { };
3549         int err;
3550
3551         do {
3552                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3553                                 _nfs4_proc_setlk(state, cmd, request),
3554                                 &exception);
3555         } while (exception.retry);
3556         return err;
3557 }
3558
3559 static int
3560 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3561 {
3562         struct nfs_open_context *ctx;
3563         struct nfs4_state *state;
3564         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3565         int status;
3566
3567         /* verify open state */
3568         ctx = nfs_file_open_context(filp);
3569         state = ctx->state;
3570
3571         if (request->fl_start < 0 || request->fl_end < 0)
3572                 return -EINVAL;
3573
3574         if (IS_GETLK(cmd))
3575                 return nfs4_proc_getlk(state, F_GETLK, request);
3576
3577         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3578                 return -EINVAL;
3579
3580         if (request->fl_type == F_UNLCK)
3581                 return nfs4_proc_unlck(state, cmd, request);
3582
3583         do {
3584                 status = nfs4_proc_setlk(state, cmd, request);
3585                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3586                         break;
3587                 timeout = nfs4_set_lock_task_retry(timeout);
3588                 status = -ERESTARTSYS;
3589                 if (signalled())
3590                         break;
3591         } while(status < 0);
3592         return status;
3593 }
3594
3595 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3596 {
3597         struct nfs_server *server = NFS_SERVER(state->inode);
3598         struct nfs4_exception exception = { };
3599         int err;
3600
3601         err = nfs4_set_lock_state(state, fl);
3602         if (err != 0)
3603                 goto out;
3604         do {
3605                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3606                 if (err != -NFS4ERR_DELAY)
3607                         break;
3608                 err = nfs4_handle_exception(server, err, &exception);
3609         } while (exception.retry);
3610 out:
3611         return err;
3612 }
3613
3614 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3615
3616 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3617                 size_t buflen, int flags)
3618 {
3619         struct inode *inode = dentry->d_inode;
3620
3621         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3622                 return -EOPNOTSUPP;
3623
3624         return nfs4_proc_set_acl(inode, buf, buflen);
3625 }
3626
3627 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3628  * and that's what we'll do for e.g. user attributes that haven't been set.
3629  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3630  * attributes in kernel-managed attribute namespaces. */
3631 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3632                 size_t buflen)
3633 {
3634         struct inode *inode = dentry->d_inode;
3635
3636         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3637                 return -EOPNOTSUPP;
3638
3639         return nfs4_proc_get_acl(inode, buf, buflen);
3640 }
3641
3642 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3643 {
3644         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3645
3646         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3647                 return 0;
3648         if (buf && buflen < len)
3649                 return -ERANGE;
3650         if (buf)
3651                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3652         return len;
3653 }
3654
3655 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3656                 struct nfs4_fs_locations *fs_locations, struct page *page)
3657 {
3658         struct nfs_server *server = NFS_SERVER(dir);
3659         u32 bitmask[2] = {
3660                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3661                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3662         };
3663         struct nfs4_fs_locations_arg args = {
3664                 .dir_fh = NFS_FH(dir),
3665                 .name = name,
3666                 .page = page,
3667                 .bitmask = bitmask,
3668         };
3669         struct rpc_message msg = {
3670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3671                 .rpc_argp = &args,
3672                 .rpc_resp = fs_locations,
3673         };
3674         int status;
3675
3676         dprintk("%s: start\n", __FUNCTION__);
3677         nfs_fattr_init(&fs_locations->fattr);
3678         fs_locations->server = server;
3679         fs_locations->nlocations = 0;
3680         status = rpc_call_sync(server->client, &msg, 0);
3681         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3682         return status;
3683 }
3684
3685 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3686         .recover_open   = nfs4_open_reclaim,
3687         .recover_lock   = nfs4_lock_reclaim,
3688 };
3689
3690 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3691         .recover_open   = nfs4_open_expired,
3692         .recover_lock   = nfs4_lock_expired,
3693 };
3694
3695 static const struct inode_operations nfs4_file_inode_operations = {
3696         .permission     = nfs_permission,
3697         .getattr        = nfs_getattr,
3698         .setattr        = nfs_setattr,
3699         .getxattr       = nfs4_getxattr,
3700         .setxattr       = nfs4_setxattr,
3701         .listxattr      = nfs4_listxattr,
3702 };
3703
3704 const struct nfs_rpc_ops nfs_v4_clientops = {
3705         .version        = 4,                    /* protocol version */
3706         .dentry_ops     = &nfs4_dentry_operations,
3707         .dir_inode_ops  = &nfs4_dir_inode_operations,
3708         .file_inode_ops = &nfs4_file_inode_operations,
3709         .getroot        = nfs4_proc_get_root,
3710         .getattr        = nfs4_proc_getattr,
3711         .setattr        = nfs4_proc_setattr,
3712         .lookupfh       = nfs4_proc_lookupfh,
3713         .lookup         = nfs4_proc_lookup,
3714         .access         = nfs4_proc_access,
3715         .readlink       = nfs4_proc_readlink,
3716         .create         = nfs4_proc_create,
3717         .remove         = nfs4_proc_remove,
3718         .unlink_setup   = nfs4_proc_unlink_setup,
3719         .unlink_done    = nfs4_proc_unlink_done,
3720         .rename         = nfs4_proc_rename,
3721         .link           = nfs4_proc_link,
3722         .symlink        = nfs4_proc_symlink,
3723         .mkdir          = nfs4_proc_mkdir,
3724         .rmdir          = nfs4_proc_remove,
3725         .readdir        = nfs4_proc_readdir,
3726         .mknod          = nfs4_proc_mknod,
3727         .statfs         = nfs4_proc_statfs,
3728         .fsinfo         = nfs4_proc_fsinfo,
3729         .pathconf       = nfs4_proc_pathconf,
3730         .set_capabilities = nfs4_server_capabilities,
3731         .decode_dirent  = nfs4_decode_dirent,
3732         .read_setup     = nfs4_proc_read_setup,
3733         .read_done      = nfs4_read_done,
3734         .write_setup    = nfs4_proc_write_setup,
3735         .write_done     = nfs4_write_done,
3736         .commit_setup   = nfs4_proc_commit_setup,
3737         .commit_done    = nfs4_commit_done,
3738         .file_open      = nfs_open,
3739         .file_release   = nfs_release,
3740         .lock           = nfs4_proc_lock,
3741         .clear_acl_cache = nfs4_zap_acl_attr,
3742 };
3743
3744 /*
3745  * Local variables:
3746  *  c-basic-offset: 8
3747  * End:
3748  */