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->before == nfsi->change_attr && cinfo->atomic)
 213                 nfsi->change_attr = cinfo->after;
 214         spin_unlock(&dir->i_lock);
 215 }
 216
 217 struct nfs4_opendata {
 218         struct kref kref;
 219         struct nfs_openargs o_arg;
 220         struct nfs_openres o_res;
 221         struct nfs_open_confirmargs c_arg;
 222         struct nfs_open_confirmres c_res;
 223         struct nfs_fattr f_attr;
 224         struct nfs_fattr dir_attr;
 225         struct path path;
 226         struct dentry *dir;
 227         struct nfs4_state_owner *owner;
 228         struct nfs4_state *state;
 229         struct iattr attrs;
 230         unsigned long timestamp;
 231         unsigned int rpc_done : 1;
 232         int rpc_status;
 233         int cancelled;
 234 };
 235
 236
 237 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 238 {
 239         p->o_res.f_attr = &p->f_attr;
 240         p->o_res.dir_attr = &p->dir_attr;
 241         p->o_res.server = p->o_arg.server;
 242         nfs_fattr_init(&p->f_attr);
 243         nfs_fattr_init(&p->dir_attr);
 244 }
 245
 246 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 247                 struct nfs4_state_owner *sp, int flags,
 248                 const struct iattr *attrs)
 249 {
 250         struct dentry *parent = dget_parent(path->dentry);
 251         struct inode *dir = parent->d_inode;
 252         struct nfs_server *server = NFS_SERVER(dir);
 253         struct nfs4_opendata *p;
 254
 255         p = kzalloc(sizeof(*p), GFP_KERNEL);
 256         if (p == NULL)
 257                 goto err;
 258         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 259         if (p->o_arg.seqid == NULL)
 260                 goto err_free;
 261         p->path.mnt = mntget(path->mnt);
 262         p->path.dentry = dget(path->dentry);
 263         p->dir = parent;
 264         p->owner = sp;
 265         atomic_inc(&sp->so_count);
 266         p->o_arg.fh = NFS_FH(dir);
 267         p->o_arg.open_flags = flags,
 268         p->o_arg.clientid = server->nfs_client->cl_clientid;
 269         p->o_arg.id = sp->so_owner_id.id;
 270         p->o_arg.name = &p->path.dentry->d_name;
 271         p->o_arg.server = server;
 272         p->o_arg.bitmask = server->attr_bitmask;
 273         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 274         if (flags & O_EXCL) {
 275                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 276                 s[0] = jiffies;
 277                 s[1] = current->pid;
 278         } else if (flags & O_CREAT) {
 279                 p->o_arg.u.attrs = &p->attrs;
 280                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 281         }
 282         p->c_arg.fh = &p->o_res.fh;
 283         p->c_arg.stateid = &p->o_res.stateid;
 284         p->c_arg.seqid = p->o_arg.seqid;
 285         nfs4_init_opendata_res(p);
 286         kref_init(&p->kref);
 287         return p;
 288 err_free:
 289         kfree(p);
 290 err:
 291         dput(parent);
 292         return NULL;
 293 }
 294
 295 static void nfs4_opendata_free(struct kref *kref)
 296 {
 297         struct nfs4_opendata *p = container_of(kref,
 298                         struct nfs4_opendata, kref);
 299
 300         nfs_free_seqid(p->o_arg.seqid);
 301         if (p->state != NULL)
 302                 nfs4_put_open_state(p->state);
 303         nfs4_put_state_owner(p->owner);
 304         dput(p->dir);
 305         dput(p->path.dentry);
 306         mntput(p->path.mnt);
 307         kfree(p);
 308 }
 309
 310 static void nfs4_opendata_put(struct nfs4_opendata *p)
 311 {
 312         if (p != NULL)
 313                 kref_put(&p->kref, nfs4_opendata_free);
 314 }
 315
 316 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 317 {
 318         sigset_t oldset;
 319         int ret;
 320
 321         rpc_clnt_sigmask(task->tk_client, &oldset);
 322         ret = rpc_wait_for_completion_task(task);
 323         rpc_clnt_sigunmask(task->tk_client, &oldset);
 324         return ret;
 325 }
 326
 327 static int can_open_cached(struct nfs4_state *state, int mode)
 328 {
 329         int ret = 0;
 330         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 331                 case FMODE_READ:
 332                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 333                         break;
 334                 case FMODE_WRITE:
 335                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 336                         break;
 337                 case FMODE_READ|FMODE_WRITE:
 338                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 339         }
 340         return ret;
 341 }
 342
 343 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 344 {
 345         if ((delegation->type & open_flags) != open_flags)
 346                 return 0;
 347         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 348                 return 0;
 349         return 1;
 350 }
 351
 352 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 353 {
 354         switch (open_flags) {
 355                 case FMODE_WRITE:
 356                         state->n_wronly++;
 357                         break;
 358                 case FMODE_READ:
 359                         state->n_rdonly++;
 360                         break;
 361                 case FMODE_READ|FMODE_WRITE:
 362                         state->n_rdwr++;
 363         }
 364         nfs4_state_set_mode_locked(state, state->state | open_flags);
 365 }
 366
 367 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 368 {
 369         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 370                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 371         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 372         switch (open_flags) {
 373                 case FMODE_READ:
 374                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 375                         break;
 376                 case FMODE_WRITE:
 377                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 378                         break;
 379                 case FMODE_READ|FMODE_WRITE:
 380                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 381         }
 382 }
 383
 384 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 385 {
 386         write_seqlock(&state->seqlock);
 387         nfs_set_open_stateid_locked(state, stateid, open_flags);
 388         write_sequnlock(&state->seqlock);
 389 }
 390
 391 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 392 {
 393         open_flags &= (FMODE_READ|FMODE_WRITE);
 394         /*
 395          * Protect the call to nfs4_state_set_mode_locked and
 396          * serialise the stateid update
 397          */
 398         write_seqlock(&state->seqlock);
 399         if (deleg_stateid != NULL) {
 400                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 401                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 402         }
 403         if (open_stateid != NULL)
 404                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 405         write_sequnlock(&state->seqlock);
 406         spin_lock(&state->owner->so_lock);
 407         update_open_stateflags(state, open_flags);
 408         spin_unlock(&state->owner->so_lock);
 409 }
 410
 411 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 412 {
 413         struct nfs_delegation *delegation;
 414
 415         rcu_read_lock();
 416         delegation = rcu_dereference(NFS_I(inode)->delegation);
 417         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 418                 rcu_read_unlock();
 419                 return;
 420         }
 421         rcu_read_unlock();
 422         nfs_inode_return_delegation(inode);
 423 }
 424
 425 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 426 {
 427         struct nfs4_state *state = opendata->state;
 428         struct nfs_inode *nfsi = NFS_I(state->inode);
 429         struct nfs_delegation *delegation;
 430         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 431         nfs4_stateid stateid;
 432         int ret = -EAGAIN;
 433
 434         rcu_read_lock();
 435         delegation = rcu_dereference(nfsi->delegation);
 436         for (;;) {
 437                 if (can_open_cached(state, open_mode)) {
 438                         spin_lock(&state->owner->so_lock);
 439                         if (can_open_cached(state, open_mode)) {
 440                                 update_open_stateflags(state, open_mode);
 441                                 spin_unlock(&state->owner->so_lock);
 442                                 rcu_read_unlock();
 443                                 goto out_return_state;
 444                         }
 445                         spin_unlock(&state->owner->so_lock);
 446                 }
 447                 if (delegation == NULL)
 448                         break;
 449                 if (!can_open_delegated(delegation, open_mode))
 450                         break;
 451                 /* Save the delegation */
 452                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 453                 rcu_read_unlock();
 454                 lock_kernel();
 455                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 456                 unlock_kernel();
 457                 if (ret != 0)
 458                         goto out;
 459                 ret = -EAGAIN;
 460                 rcu_read_lock();
 461                 delegation = rcu_dereference(nfsi->delegation);
 462                 /* If no delegation, try a cached open */
 463                 if (delegation == NULL)
 464                         continue;
 465                 /* Is the delegation still valid? */
 466                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 467                         continue;
 468                 rcu_read_unlock();
 469                 update_open_stateid(state, NULL, &stateid, open_mode);
 470                 goto out_return_state;
 471         }
 472         rcu_read_unlock();
 473 out:
 474         return ERR_PTR(ret);
 475 out_return_state:
 476         atomic_inc(&state->count);
 477         return state;
 478 }
 479
 480 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 481 {
 482         struct inode *inode;
 483         struct nfs4_state *state = NULL;
 484         struct nfs_delegation *delegation;
 485         nfs4_stateid *deleg_stateid = NULL;
 486         int ret;
 487
 488         if (!data->rpc_done) {
 489                 state = nfs4_try_open_cached(data);
 490                 goto out;
 491         }
 492
 493         ret = -EAGAIN;
 494         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 495                 goto err;
 496         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 497         ret = PTR_ERR(inode);
 498         if (IS_ERR(inode))
 499                 goto err;
 500         ret = -ENOMEM;
 501         state = nfs4_get_open_state(inode, data->owner);
 502         if (state == NULL)
 503                 goto err_put_inode;
 504         if (data->o_res.delegation_type != 0) {
 505                 int delegation_flags = 0;
 506
 507                 rcu_read_lock();
 508                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 509                 if (delegation)
 510                         delegation_flags = delegation->flags;
 511                 rcu_read_unlock();
 512                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 513                         nfs_inode_set_delegation(state->inode,
 514                                         data->owner->so_cred,
 515                                         &data->o_res);
 516                 else
 517                         nfs_inode_reclaim_delegation(state->inode,
 518                                         data->owner->so_cred,
 519                                         &data->o_res);
 520         }
 521         rcu_read_lock();
 522         delegation = rcu_dereference(NFS_I(inode)->delegation);
 523         if (delegation != NULL)
 524                 deleg_stateid = &delegation->stateid;
 525         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 526         rcu_read_unlock();
 527         iput(inode);
 528 out:
 529         return state;
 530 err_put_inode:
 531         iput(inode);
 532 err:
 533         return ERR_PTR(ret);
 534 }
 535
 536 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 537 {
 538         struct nfs_inode *nfsi = NFS_I(state->inode);
 539         struct nfs_open_context *ctx;
 540
 541         spin_lock(&state->inode->i_lock);
 542         list_for_each_entry(ctx, &nfsi->open_files, list) {
 543                 if (ctx->state != state)
 544                         continue;
 545                 get_nfs_open_context(ctx);
 546                 spin_unlock(&state->inode->i_lock);
 547                 return ctx;
 548         }
 549         spin_unlock(&state->inode->i_lock);
 550         return ERR_PTR(-ENOENT);
 551 }
 552
 553 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 554 {
 555         struct nfs4_opendata *opendata;
 556
 557         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 558         if (opendata == NULL)
 559                 return ERR_PTR(-ENOMEM);
 560         opendata->state = state;
 561         atomic_inc(&state->count);
 562         return opendata;
 563 }
 564
 565 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 566 {
 567         struct nfs4_state *newstate;
 568         int ret;
 569
 570         opendata->o_arg.open_flags = openflags;
 571         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 572         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 573         nfs4_init_opendata_res(opendata);
 574         ret = _nfs4_proc_open(opendata);
 575         if (ret != 0)
 576                 return ret;
 577         newstate = nfs4_opendata_to_nfs4_state(opendata);
 578         if (IS_ERR(newstate))
 579                 return PTR_ERR(newstate);
 580         nfs4_close_state(&opendata->path, newstate, openflags);
 581         *res = newstate;
 582         return 0;
 583 }
 584
 585 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 586 {
 587         struct nfs4_state *newstate;
 588         int ret;
 589
 590         /* memory barrier prior to reading state->n_* */
 591         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 592         smp_rmb();
 593         if (state->n_rdwr != 0) {
 594                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 595                 if (ret != 0)
 596                         return ret;
 597                 if (newstate != state)
 598                         return -ESTALE;
 599         }
 600         if (state->n_wronly != 0) {
 601                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 602                 if (ret != 0)
 603                         return ret;
 604                 if (newstate != state)
 605                         return -ESTALE;
 606         }
 607         if (state->n_rdonly != 0) {
 608                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 609                 if (ret != 0)
 610                         return ret;
 611                 if (newstate != state)
 612                         return -ESTALE;
 613         }
 614         /*
 615          * We may have performed cached opens for all three recoveries.
 616          * Check if we need to update the current stateid.
 617          */
 618         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 619             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 620                 write_seqlock(&state->seqlock);
 621                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 622                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 623                 write_sequnlock(&state->seqlock);
 624         }
 625         return 0;
 626 }
 627
 628 /*
 629  * OPEN_RECLAIM:
 630  *      reclaim state on the server after a reboot.
 631  */
 632 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 633 {
 634         struct nfs_delegation *delegation;
 635         struct nfs4_opendata *opendata;
 636         int delegation_type = 0;
 637         int status;
 638
 639         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 640         if (IS_ERR(opendata))
 641                 return PTR_ERR(opendata);
 642         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 643         opendata->o_arg.fh = NFS_FH(state->inode);
 644         rcu_read_lock();
 645         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 646         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 647                 delegation_type = delegation->type;
 648         rcu_read_unlock();
 649         opendata->o_arg.u.delegation_type = delegation_type;
 650         status = nfs4_open_recover(opendata, state);
 651         nfs4_opendata_put(opendata);
 652         return status;
 653 }
 654
 655 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 656 {
 657         struct nfs_server *server = NFS_SERVER(state->inode);
 658         struct nfs4_exception exception = { };
 659         int err;
 660         do {
 661                 err = _nfs4_do_open_reclaim(ctx, state);
 662                 if (err != -NFS4ERR_DELAY)
 663                         break;
 664                 nfs4_handle_exception(server, err, &exception);
 665         } while (exception.retry);
 666         return err;
 667 }
 668
 669 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 670 {
 671         struct nfs_open_context *ctx;
 672         int ret;
 673
 674         ctx = nfs4_state_find_open_context(state);
 675         if (IS_ERR(ctx))
 676                 return PTR_ERR(ctx);
 677         ret = nfs4_do_open_reclaim(ctx, state);
 678         put_nfs_open_context(ctx);
 679         return ret;
 680 }
 681
 682 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 683 {
 684         struct nfs4_opendata *opendata;
 685         int ret;
 686
 687         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 688         if (IS_ERR(opendata))
 689                 return PTR_ERR(opendata);
 690         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 691         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 692                         sizeof(opendata->o_arg.u.delegation.data));
 693         ret = nfs4_open_recover(opendata, state);
 694         nfs4_opendata_put(opendata);
 695         return ret;
 696 }
 697
 698 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 699 {
 700         struct nfs4_exception exception = { };
 701         struct nfs_server *server = NFS_SERVER(state->inode);
 702         int err;
 703         do {
 704                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 705                 switch (err) {
 706                         case 0:
 707                                 return err;
 708                         case -NFS4ERR_STALE_CLIENTID:
 709                         case -NFS4ERR_STALE_STATEID:
 710                         case -NFS4ERR_EXPIRED:
 711                                 /* Don't recall a delegation if it was lost */
 712                                 nfs4_schedule_state_recovery(server->nfs_client);
 713                                 return err;
 714                 }
 715                 err = nfs4_handle_exception(server, err, &exception);
 716         } while (exception.retry);
 717         return err;
 718 }
 719
 720 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 721 {
 722         struct nfs4_opendata *data = calldata;
 723         struct  rpc_message msg = {
 724                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 725                 .rpc_argp = &data->c_arg,
 726                 .rpc_resp = &data->c_res,
 727                 .rpc_cred = data->owner->so_cred,
 728         };
 729         data->timestamp = jiffies;
 730         rpc_call_setup(task, &msg, 0);
 731 }
 732
 733 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 734 {
 735         struct nfs4_opendata *data = calldata;
 736
 737         data->rpc_status = task->tk_status;
 738         if (RPC_ASSASSINATED(task))
 739                 return;
 740         if (data->rpc_status == 0) {
 741                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 742                                 sizeof(data->o_res.stateid.data));
 743                 renew_lease(data->o_res.server, data->timestamp);
 744                 data->rpc_done = 1;
 745         }
 746         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 747         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 748 }
 749
 750 static void nfs4_open_confirm_release(void *calldata)
 751 {
 752         struct nfs4_opendata *data = calldata;
 753         struct nfs4_state *state = NULL;
 754
 755         /* If this request hasn't been cancelled, do nothing */
 756         if (data->cancelled == 0)
 757                 goto out_free;
 758         /* In case of error, no cleanup! */
 759         if (!data->rpc_done)
 760                 goto out_free;
 761         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 762         state = nfs4_opendata_to_nfs4_state(data);
 763         if (!IS_ERR(state))
 764                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 765 out_free:
 766         nfs4_opendata_put(data);
 767 }
 768
 769 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 770         .rpc_call_prepare = nfs4_open_confirm_prepare,
 771         .rpc_call_done = nfs4_open_confirm_done,
 772         .rpc_release = nfs4_open_confirm_release,
 773 };
 774
 775 /*
 776  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 777  */
 778 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 779 {
 780         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 781         struct rpc_task *task;
 782         int status;
 783
 784         kref_get(&data->kref);
 785         data->rpc_done = 0;
 786         data->rpc_status = 0;
 787         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, 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         struct rpc_message msg = {
 805                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 806                 .rpc_argp = &data->o_arg,
 807                 .rpc_resp = &data->o_res,
 808                 .rpc_cred = sp->so_cred,
 809         };
 810
 811         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 812                 return;
 813         /*
 814          * Check if we still need to send an OPEN call, or if we can use
 815          * a delegation instead.
 816          */
 817         if (data->state != NULL) {
 818                 struct nfs_delegation *delegation;
 819
 820                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 821                         goto out_no_action;
 822                 rcu_read_lock();
 823                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 824                 if (delegation != NULL &&
 825                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 826                         rcu_read_unlock();
 827                         goto out_no_action;
 828                 }
 829                 rcu_read_unlock();
 830         }
 831         /* Update sequence id. */
 832         data->o_arg.id = sp->so_owner_id.id;
 833         data->o_arg.clientid = sp->so_client->cl_clientid;
 834         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 835                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 836                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 837         }
 838         data->timestamp = jiffies;
 839         rpc_call_setup(task, &msg, 0);
 840         return;
 841 out_no_action:
 842         task->tk_action = NULL;
 843
 844 }
 845
 846 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 847 {
 848         struct nfs4_opendata *data = calldata;
 849
 850         data->rpc_status = task->tk_status;
 851         if (RPC_ASSASSINATED(task))
 852                 return;
 853         if (task->tk_status == 0) {
 854                 switch (data->o_res.f_attr->mode & S_IFMT) {
 855                         case S_IFREG:
 856                                 break;
 857                         case S_IFLNK:
 858                                 data->rpc_status = -ELOOP;
 859                                 break;
 860                         case S_IFDIR:
 861                                 data->rpc_status = -EISDIR;
 862                                 break;
 863                         default:
 864                                 data->rpc_status = -ENOTDIR;
 865                 }
 866                 renew_lease(data->o_res.server, data->timestamp);
 867                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 868                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 869         }
 870         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 871         data->rpc_done = 1;
 872 }
 873
 874 static void nfs4_open_release(void *calldata)
 875 {
 876         struct nfs4_opendata *data = calldata;
 877         struct nfs4_state *state = NULL;
 878
 879         /* If this request hasn't been cancelled, do nothing */
 880         if (data->cancelled == 0)
 881                 goto out_free;
 882         /* In case of error, no cleanup! */
 883         if (data->rpc_status != 0 || !data->rpc_done)
 884                 goto out_free;
 885         /* In case we need an open_confirm, no cleanup! */
 886         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 887                 goto out_free;
 888         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 889         state = nfs4_opendata_to_nfs4_state(data);
 890         if (!IS_ERR(state))
 891                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 892 out_free:
 893         nfs4_opendata_put(data);
 894 }
 895
 896 static const struct rpc_call_ops nfs4_open_ops = {
 897         .rpc_call_prepare = nfs4_open_prepare,
 898         .rpc_call_done = nfs4_open_done,
 899         .rpc_release = nfs4_open_release,
 900 };
 901
 902 /*
 903  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 904  */
 905 static int _nfs4_proc_open(struct nfs4_opendata *data)
 906 {
 907         struct inode *dir = data->dir->d_inode;
 908         struct nfs_server *server = NFS_SERVER(dir);
 909         struct nfs_openargs *o_arg = &data->o_arg;
 910         struct nfs_openres *o_res = &data->o_res;
 911         struct rpc_task *task;
 912         int status;
 913
 914         kref_get(&data->kref);
 915         data->rpc_done = 0;
 916         data->rpc_status = 0;
 917         data->cancelled = 0;
 918         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 919         if (IS_ERR(task))
 920                 return PTR_ERR(task);
 921         status = nfs4_wait_for_completion_rpc_task(task);
 922         if (status != 0) {
 923                 data->cancelled = 1;
 924                 smp_wmb();
 925         } else
 926                 status = data->rpc_status;
 927         rpc_put_task(task);
 928         if (status != 0 || !data->rpc_done)
 929                 return status;
 930
 931         if (o_res->fh.size == 0)
 932                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 933
 934         if (o_arg->open_flags & O_CREAT) {
 935                 update_changeattr(dir, &o_res->cinfo);
 936                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 937         } else
 938                 nfs_refresh_inode(dir, o_res->dir_attr);
 939         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 940                 status = _nfs4_proc_open_confirm(data);
 941                 if (status != 0)
 942                         return status;
 943         }
 944         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 945                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 946         return 0;
 947 }
 948
 949 static int nfs4_recover_expired_lease(struct nfs_server *server)
 950 {
 951         struct nfs_client *clp = server->nfs_client;
 952         int ret;
 953
 954         for (;;) {
 955                 ret = nfs4_wait_clnt_recover(server->client, clp);
 956                 if (ret != 0)
 957                         return ret;
 958                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 959                         break;
 960                 nfs4_schedule_state_recovery(clp);
 961         }
 962         return 0;
 963 }
 964
 965 /*
 966  * OPEN_EXPIRED:
 967  *      reclaim state on the server after a network partition.
 968  *      Assumes caller holds the appropriate lock
 969  */
 970 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 971 {
 972         struct nfs4_opendata *opendata;
 973         int ret;
 974
 975         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 976         if (IS_ERR(opendata))
 977                 return PTR_ERR(opendata);
 978         ret = nfs4_open_recover(opendata, state);
 979         if (ret == -ESTALE) {
 980                 /* Invalidate the state owner so we don't ever use it again */
 981                 nfs4_drop_state_owner(state->owner);
 982                 d_drop(ctx->path.dentry);
 983         }
 984         nfs4_opendata_put(opendata);
 985         return ret;
 986 }
 987
 988 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 989 {
 990         struct nfs_server *server = NFS_SERVER(state->inode);
 991         struct nfs4_exception exception = { };
 992         int err;
 993
 994         do {
 995                 err = _nfs4_open_expired(ctx, state);
 996                 if (err == -NFS4ERR_DELAY)
 997                         nfs4_handle_exception(server, err, &exception);
 998         } while (exception.retry);
 999         return err;
1000 }
1001
1002 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1003 {
1004         struct nfs_open_context *ctx;
1005         int ret;
1006
1007         ctx = nfs4_state_find_open_context(state);
1008         if (IS_ERR(ctx))
1009                 return PTR_ERR(ctx);
1010         ret = nfs4_do_open_expired(ctx, state);
1011         put_nfs_open_context(ctx);
1012         return ret;
1013 }
1014
1015 /*
1016  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1017  * fields corresponding to attributes that were used to store the verifier.
1018  * Make sure we clobber those fields in the later setattr call
1019  */
1020 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1021 {
1022         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1023             !(sattr->ia_valid & ATTR_ATIME_SET))
1024                 sattr->ia_valid |= ATTR_ATIME;
1025
1026         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1027             !(sattr->ia_valid & ATTR_MTIME_SET))
1028                 sattr->ia_valid |= ATTR_MTIME;
1029 }
1030
1031 /*
1032  * Returns a referenced nfs4_state
1033  */
1034 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1035 {
1036         struct nfs4_state_owner  *sp;
1037         struct nfs4_state     *state = NULL;
1038         struct nfs_server       *server = NFS_SERVER(dir);
1039         struct nfs_client *clp = server->nfs_client;
1040         struct nfs4_opendata *opendata;
1041         int status;
1042
1043         /* Protect against reboot recovery conflicts */
1044         status = -ENOMEM;
1045         if (!(sp = nfs4_get_state_owner(server, cred))) {
1046                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1047                 goto out_err;
1048         }
1049         status = nfs4_recover_expired_lease(server);
1050         if (status != 0)
1051                 goto err_put_state_owner;
1052         if (path->dentry->d_inode != NULL)
1053                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1054         down_read(&clp->cl_sem);
1055         status = -ENOMEM;
1056         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1057         if (opendata == NULL)
1058                 goto err_release_rwsem;
1059
1060         if (path->dentry->d_inode != NULL)
1061                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1062
1063         status = _nfs4_proc_open(opendata);
1064         if (status != 0)
1065                 goto err_opendata_put;
1066
1067         if (opendata->o_arg.open_flags & O_EXCL)
1068                 nfs4_exclusive_attrset(opendata, sattr);
1069
1070         state = nfs4_opendata_to_nfs4_state(opendata);
1071         status = PTR_ERR(state);
1072         if (IS_ERR(state))
1073                 goto err_opendata_put;
1074         nfs4_opendata_put(opendata);
1075         nfs4_put_state_owner(sp);
1076         up_read(&clp->cl_sem);
1077         *res = state;
1078         return 0;
1079 err_opendata_put:
1080         nfs4_opendata_put(opendata);
1081 err_release_rwsem:
1082         up_read(&clp->cl_sem);
1083 err_put_state_owner:
1084         nfs4_put_state_owner(sp);
1085 out_err:
1086         *res = NULL;
1087         return status;
1088 }
1089
1090
1091 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1092 {
1093         struct nfs4_exception exception = { };
1094         struct nfs4_state *res;
1095         int status;
1096
1097         do {
1098                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1099                 if (status == 0)
1100                         break;
1101                 /* NOTE: BAD_SEQID means the server and client disagree about the
1102                  * book-keeping w.r.t. state-changing operations
1103                  * (OPEN/CLOSE/LOCK/LOCKU...)
1104                  * It is actually a sign of a bug on the client or on the server.
1105                  *
1106                  * If we receive a BAD_SEQID error in the particular case of
1107                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1108                  * have unhashed the old state_owner for us, and that we can
1109                  * therefore safely retry using a new one. We should still warn
1110                  * the user though...
1111                  */
1112                 if (status == -NFS4ERR_BAD_SEQID) {
1113                         printk(KERN_WARNING "NFS: v4 server %s "
1114                                         " returned a bad sequence-id error!\n",
1115                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1116                         exception.retry = 1;
1117                         continue;
1118                 }
1119                 /*
1120                  * BAD_STATEID on OPEN means that the server cancelled our
1121                  * state before it received the OPEN_CONFIRM.
1122                  * Recover by retrying the request as per the discussion
1123                  * on Page 181 of RFC3530.
1124                  */
1125                 if (status == -NFS4ERR_BAD_STATEID) {
1126                         exception.retry = 1;
1127                         continue;
1128                 }
1129                 if (status == -EAGAIN) {
1130                         /* We must have found a delegation */
1131                         exception.retry = 1;
1132                         continue;
1133                 }
1134                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1135                                         status, &exception));
1136         } while (exception.retry);
1137         return res;
1138 }
1139
1140 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1141                 struct iattr *sattr, struct nfs4_state *state)
1142 {
1143         struct nfs_server *server = NFS_SERVER(inode);
1144         struct nfs_setattrargs  arg = {
1145                 .fh             = NFS_FH(inode),
1146                 .iap            = sattr,
1147                 .server         = server,
1148                 .bitmask = server->attr_bitmask,
1149         };
1150         struct nfs_setattrres  res = {
1151                 .fattr          = fattr,
1152                 .server         = server,
1153         };
1154         struct rpc_message msg = {
1155                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1156                 .rpc_argp       = &arg,
1157                 .rpc_resp       = &res,
1158         };
1159         unsigned long timestamp = jiffies;
1160         int status;
1161
1162         nfs_fattr_init(fattr);
1163
1164         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1165                 /* Use that stateid */
1166         } else if (state != NULL) {
1167                 msg.rpc_cred = state->owner->so_cred;
1168                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1169         } else
1170                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1171
1172         status = rpc_call_sync(server->client, &msg, 0);
1173         if (status == 0 && state != NULL)
1174                 renew_lease(server, timestamp);
1175         return status;
1176 }
1177
1178 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1179                 struct iattr *sattr, struct nfs4_state *state)
1180 {
1181         struct nfs_server *server = NFS_SERVER(inode);
1182         struct nfs4_exception exception = { };
1183         int err;
1184         do {
1185                 err = nfs4_handle_exception(server,
1186                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1187                                 &exception);
1188         } while (exception.retry);
1189         return err;
1190 }
1191
1192 struct nfs4_closedata {
1193         struct path path;
1194         struct inode *inode;
1195         struct nfs4_state *state;
1196         struct nfs_closeargs arg;
1197         struct nfs_closeres res;
1198         struct nfs_fattr fattr;
1199         unsigned long timestamp;
1200 };
1201
1202 static void nfs4_free_closedata(void *data)
1203 {
1204         struct nfs4_closedata *calldata = data;
1205         struct nfs4_state_owner *sp = calldata->state->owner;
1206
1207         nfs4_put_open_state(calldata->state);
1208         nfs_free_seqid(calldata->arg.seqid);
1209         nfs4_put_state_owner(sp);
1210         dput(calldata->path.dentry);
1211         mntput(calldata->path.mnt);
1212         kfree(calldata);
1213 }
1214
1215 static void nfs4_close_done(struct rpc_task *task, void *data)
1216 {
1217         struct nfs4_closedata *calldata = data;
1218         struct nfs4_state *state = calldata->state;
1219         struct nfs_server *server = NFS_SERVER(calldata->inode);
1220
1221         if (RPC_ASSASSINATED(task))
1222                 return;
1223         /* hmm. we are done with the inode, and in the process of freeing
1224          * the state_owner. we keep this around to process errors
1225          */
1226         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1227         switch (task->tk_status) {
1228                 case 0:
1229                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1230                         renew_lease(server, calldata->timestamp);
1231                         break;
1232                 case -NFS4ERR_STALE_STATEID:
1233                 case -NFS4ERR_EXPIRED:
1234                         break;
1235                 default:
1236                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1237                                 rpc_restart_call(task);
1238                                 return;
1239                         }
1240         }
1241         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1242 }
1243
1244 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1245 {
1246         struct nfs4_closedata *calldata = data;
1247         struct nfs4_state *state = calldata->state;
1248         struct rpc_message msg = {
1249                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1250                 .rpc_argp = &calldata->arg,
1251                 .rpc_resp = &calldata->res,
1252                 .rpc_cred = state->owner->so_cred,
1253         };
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                 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                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1284                 calldata->arg.open_flags = FMODE_WRITE;
1285         }
1286         calldata->timestamp = jiffies;
1287         rpc_call_setup(task, &msg, 0);
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)
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         int status = -ENOMEM;
1314
1315         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1316         if (calldata == NULL)
1317                 goto out;
1318         calldata->inode = state->inode;
1319         calldata->state = state;
1320         calldata->arg.fh = NFS_FH(state->inode);
1321         calldata->arg.stateid = &state->open_stateid;
1322         /* Serialization for the sequence id */
1323         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1324         if (calldata->arg.seqid == NULL)
1325                 goto out_free_calldata;
1326         calldata->arg.bitmask = server->attr_bitmask;
1327         calldata->res.fattr = &calldata->fattr;
1328         calldata->res.server = server;
1329         calldata->path.mnt = mntget(path->mnt);
1330         calldata->path.dentry = dget(path->dentry);
1331
1332         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1333         if (IS_ERR(task))
1334                 return PTR_ERR(task);
1335         rpc_put_task(task);
1336         return 0;
1337 out_free_calldata:
1338         kfree(calldata);
1339 out:
1340         nfs4_put_open_state(state);
1341         nfs4_put_state_owner(sp);
1342         return status;
1343 }
1344
1345 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1346 {
1347         struct file *filp;
1348         int ret;
1349
1350         /* If the open_intent is for execute, we have an extra check to make */
1351         if (nd->intent.open.flags & FMODE_EXEC) {
1352                 ret = nfs_may_open(state->inode,
1353                                 state->owner->so_cred,
1354                                 nd->intent.open.flags);
1355                 if (ret < 0)
1356                         goto out_close;
1357         }
1358         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1359         if (!IS_ERR(filp)) {
1360                 struct nfs_open_context *ctx;
1361                 ctx = nfs_file_open_context(filp);
1362                 ctx->state = state;
1363                 return 0;
1364         }
1365         ret = PTR_ERR(filp);
1366 out_close:
1367         nfs4_close_state(path, state, nd->intent.open.flags);
1368         return ret;
1369 }
1370
1371 struct dentry *
1372 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1373 {
1374         struct path path = {
1375                 .mnt = nd->mnt,
1376                 .dentry = dentry,
1377         };
1378         struct iattr attr;
1379         struct rpc_cred *cred;
1380         struct nfs4_state *state;
1381         struct dentry *res;
1382
1383         if (nd->flags & LOOKUP_CREATE) {
1384                 attr.ia_mode = nd->intent.open.create_mode;
1385                 attr.ia_valid = ATTR_MODE;
1386                 if (!IS_POSIXACL(dir))
1387                         attr.ia_mode &= ~current->fs->umask;
1388         } else {
1389                 attr.ia_valid = 0;
1390                 BUG_ON(nd->intent.open.flags & O_CREAT);
1391         }
1392
1393         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1394         if (IS_ERR(cred))
1395                 return (struct dentry *)cred;
1396         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1397         put_rpccred(cred);
1398         if (IS_ERR(state)) {
1399                 if (PTR_ERR(state) == -ENOENT)
1400                         d_add(dentry, NULL);
1401                 return (struct dentry *)state;
1402         }
1403         res = d_add_unique(dentry, igrab(state->inode));
1404         if (res != NULL)
1405                 path.dentry = res;
1406         nfs4_intent_set_file(nd, &path, state);
1407         return res;
1408 }
1409
1410 int
1411 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1412 {
1413         struct path path = {
1414                 .mnt = nd->mnt,
1415                 .dentry = dentry,
1416         };
1417         struct rpc_cred *cred;
1418         struct nfs4_state *state;
1419
1420         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1421         if (IS_ERR(cred))
1422                 return PTR_ERR(cred);
1423         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1424         put_rpccred(cred);
1425         if (IS_ERR(state)) {
1426                 switch (PTR_ERR(state)) {
1427                         case -EPERM:
1428                         case -EACCES:
1429                         case -EDQUOT:
1430                         case -ENOSPC:
1431                         case -EROFS:
1432                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1433                                 return 1;
1434                         default:
1435                                 goto out_drop;
1436                 }
1437         }
1438         if (state->inode == dentry->d_inode) {
1439                 nfs4_intent_set_file(nd, &path, state);
1440                 return 1;
1441         }
1442         nfs4_close_state(&path, state, openflags);
1443 out_drop:
1444         d_drop(dentry);
1445         return 0;
1446 }
1447
1448
1449 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1450 {
1451         struct nfs4_server_caps_res res = {};
1452         struct rpc_message msg = {
1453                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1454                 .rpc_argp = fhandle,
1455                 .rpc_resp = &res,
1456         };
1457         int status;
1458
1459         status = rpc_call_sync(server->client, &msg, 0);
1460         if (status == 0) {
1461                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1462                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1463                         server->caps |= NFS_CAP_ACLS;
1464                 if (res.has_links != 0)
1465                         server->caps |= NFS_CAP_HARDLINKS;
1466                 if (res.has_symlinks != 0)
1467                         server->caps |= NFS_CAP_SYMLINKS;
1468                 server->acl_bitmask = res.acl_bitmask;
1469         }
1470         return status;
1471 }
1472
1473 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1474 {
1475         struct nfs4_exception exception = { };
1476         int err;
1477         do {
1478                 err = nfs4_handle_exception(server,
1479                                 _nfs4_server_capabilities(server, fhandle),
1480                                 &exception);
1481         } while (exception.retry);
1482         return err;
1483 }
1484
1485 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1486                 struct nfs_fsinfo *info)
1487 {
1488         struct nfs4_lookup_root_arg args = {
1489                 .bitmask = nfs4_fattr_bitmap,
1490         };
1491         struct nfs4_lookup_res res = {
1492                 .server = server,
1493                 .fattr = info->fattr,
1494                 .fh = fhandle,
1495         };
1496         struct rpc_message msg = {
1497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1498                 .rpc_argp = &args,
1499                 .rpc_resp = &res,
1500         };
1501         nfs_fattr_init(info->fattr);
1502         return rpc_call_sync(server->client, &msg, 0);
1503 }
1504
1505 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1506                 struct nfs_fsinfo *info)
1507 {
1508         struct nfs4_exception exception = { };
1509         int err;
1510         do {
1511                 err = nfs4_handle_exception(server,
1512                                 _nfs4_lookup_root(server, fhandle, info),
1513                                 &exception);
1514         } while (exception.retry);
1515         return err;
1516 }
1517
1518 /*
1519  * get the file handle for the "/" directory on the server
1520  */
1521 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1522                               struct nfs_fsinfo *info)
1523 {
1524         int status;
1525
1526         status = nfs4_lookup_root(server, fhandle, info);
1527         if (status == 0)
1528                 status = nfs4_server_capabilities(server, fhandle);
1529         if (status == 0)
1530                 status = nfs4_do_fsinfo(server, fhandle, info);
1531         return nfs4_map_errors(status);
1532 }
1533
1534 /*
1535  * Get locations and (maybe) other attributes of a referral.
1536  * Note that we'll actually follow the referral later when
1537  * we detect fsid mismatch in inode revalidation
1538  */
1539 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1540 {
1541         int status = -ENOMEM;
1542         struct page *page = NULL;
1543         struct nfs4_fs_locations *locations = NULL;
1544
1545         page = alloc_page(GFP_KERNEL);
1546         if (page == NULL)
1547                 goto out;
1548         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1549         if (locations == NULL)
1550                 goto out;
1551
1552         status = nfs4_proc_fs_locations(dir, name, locations, page);
1553         if (status != 0)
1554                 goto out;
1555         /* Make sure server returned a different fsid for the referral */
1556         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1557                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1558                 status = -EIO;
1559                 goto out;
1560         }
1561
1562         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1563         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1564         if (!fattr->mode)
1565                 fattr->mode = S_IFDIR;
1566         memset(fhandle, 0, sizeof(struct nfs_fh));
1567 out:
1568         if (page)
1569                 __free_page(page);
1570         if (locations)
1571                 kfree(locations);
1572         return status;
1573 }
1574
1575 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1576 {
1577         struct nfs4_getattr_arg args = {
1578                 .fh = fhandle,
1579                 .bitmask = server->attr_bitmask,
1580         };
1581         struct nfs4_getattr_res res = {
1582                 .fattr = fattr,
1583                 .server = server,
1584         };
1585         struct rpc_message msg = {
1586                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1587                 .rpc_argp = &args,
1588                 .rpc_resp = &res,
1589         };
1590
1591         nfs_fattr_init(fattr);
1592         return rpc_call_sync(server->client, &msg, 0);
1593 }
1594
1595 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1596 {
1597         struct nfs4_exception exception = { };
1598         int err;
1599         do {
1600                 err = nfs4_handle_exception(server,
1601                                 _nfs4_proc_getattr(server, fhandle, fattr),
1602                                 &exception);
1603         } while (exception.retry);
1604         return err;
1605 }
1606
1607 /*
1608  * The file is not closed if it is opened due to the a request to change
1609  * the size of the file. The open call will not be needed once the
1610  * VFS layer lookup-intents are implemented.
1611  *
1612  * Close is called when the inode is destroyed.
1613  * If we haven't opened the file for O_WRONLY, we
1614  * need to in the size_change case to obtain a stateid.
1615  *
1616  * Got race?
1617  * Because OPEN is always done by name in nfsv4, it is
1618  * possible that we opened a different file by the same
1619  * name.  We can recognize this race condition, but we
1620  * can't do anything about it besides returning an error.
1621  *
1622  * This will be fixed with VFS changes (lookup-intent).
1623  */
1624 static int
1625 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1626                   struct iattr *sattr)
1627 {
1628         struct rpc_cred *cred;
1629         struct inode *inode = dentry->d_inode;
1630         struct nfs_open_context *ctx;
1631         struct nfs4_state *state = NULL;
1632         int status;
1633
1634         nfs_fattr_init(fattr);
1635
1636         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1637         if (IS_ERR(cred))
1638                 return PTR_ERR(cred);
1639
1640         /* Search for an existing open(O_WRITE) file */
1641         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1642         if (ctx != NULL)
1643                 state = ctx->state;
1644
1645         status = nfs4_do_setattr(inode, fattr, sattr, state);
1646         if (status == 0)
1647                 nfs_setattr_update_inode(inode, sattr);
1648         if (ctx != NULL)
1649                 put_nfs_open_context(ctx);
1650         put_rpccred(cred);
1651         return status;
1652 }
1653
1654 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1655                 const struct qstr *name, struct nfs_fh *fhandle,
1656                 struct nfs_fattr *fattr)
1657 {
1658         int                    status;
1659         struct nfs4_lookup_arg args = {
1660                 .bitmask = server->attr_bitmask,
1661                 .dir_fh = dirfh,
1662                 .name = name,
1663         };
1664         struct nfs4_lookup_res res = {
1665                 .server = server,
1666                 .fattr = fattr,
1667                 .fh = fhandle,
1668         };
1669         struct rpc_message msg = {
1670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1671                 .rpc_argp = &args,
1672                 .rpc_resp = &res,
1673         };
1674
1675         nfs_fattr_init(fattr);
1676
1677         dprintk("NFS call  lookupfh %s\n", name->name);
1678         status = rpc_call_sync(server->client, &msg, 0);
1679         dprintk("NFS reply lookupfh: %d\n", status);
1680         return status;
1681 }
1682
1683 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1684                               struct qstr *name, struct nfs_fh *fhandle,
1685                               struct nfs_fattr *fattr)
1686 {
1687         struct nfs4_exception exception = { };
1688         int err;
1689         do {
1690                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1691                 /* FIXME: !!!! */
1692                 if (err == -NFS4ERR_MOVED) {
1693                         err = -EREMOTE;
1694                         break;
1695                 }
1696                 err = nfs4_handle_exception(server, err, &exception);
1697         } while (exception.retry);
1698         return err;
1699 }
1700
1701 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1702                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1703 {
1704         int status;
1705
1706         dprintk("NFS call  lookup %s\n", name->name);
1707         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1708         if (status == -NFS4ERR_MOVED)
1709                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1710         dprintk("NFS reply lookup: %d\n", status);
1711         return status;
1712 }
1713
1714 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1715 {
1716         struct nfs4_exception exception = { };
1717         int err;
1718         do {
1719                 err = nfs4_handle_exception(NFS_SERVER(dir),
1720                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1721                                 &exception);
1722         } while (exception.retry);
1723         return err;
1724 }
1725
1726 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1727 {
1728         struct nfs_server *server = NFS_SERVER(inode);
1729         struct nfs_fattr fattr;
1730         struct nfs4_accessargs args = {
1731                 .fh = NFS_FH(inode),
1732                 .bitmask = server->attr_bitmask,
1733         };
1734         struct nfs4_accessres res = {
1735                 .server = server,
1736                 .fattr = &fattr,
1737         };
1738         struct rpc_message msg = {
1739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1740                 .rpc_argp = &args,
1741                 .rpc_resp = &res,
1742                 .rpc_cred = entry->cred,
1743         };
1744         int mode = entry->mask;
1745         int status;
1746
1747         /*
1748          * Determine which access bits we want to ask for...
1749          */
1750         if (mode & MAY_READ)
1751                 args.access |= NFS4_ACCESS_READ;
1752         if (S_ISDIR(inode->i_mode)) {
1753                 if (mode & MAY_WRITE)
1754                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1755                 if (mode & MAY_EXEC)
1756                         args.access |= NFS4_ACCESS_LOOKUP;
1757         } else {
1758                 if (mode & MAY_WRITE)
1759                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1760                 if (mode & MAY_EXEC)
1761                         args.access |= NFS4_ACCESS_EXECUTE;
1762         }
1763         nfs_fattr_init(&fattr);
1764         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1765         if (!status) {
1766                 entry->mask = 0;
1767                 if (res.access & NFS4_ACCESS_READ)
1768                         entry->mask |= MAY_READ;
1769                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1770                         entry->mask |= MAY_WRITE;
1771                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1772                         entry->mask |= MAY_EXEC;
1773                 nfs_refresh_inode(inode, &fattr);
1774         }
1775         return status;
1776 }
1777
1778 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1779 {
1780         struct nfs4_exception exception = { };
1781         int err;
1782         do {
1783                 err = nfs4_handle_exception(NFS_SERVER(inode),
1784                                 _nfs4_proc_access(inode, entry),
1785                                 &exception);
1786         } while (exception.retry);
1787         return err;
1788 }
1789
1790 /*
1791  * TODO: For the time being, we don't try to get any attributes
1792  * along with any of the zero-copy operations READ, READDIR,
1793  * READLINK, WRITE.
1794  *
1795  * In the case of the first three, we want to put the GETATTR
1796  * after the read-type operation -- this is because it is hard
1797  * to predict the length of a GETATTR response in v4, and thus
1798  * align the READ data correctly.  This means that the GETATTR
1799  * may end up partially falling into the page cache, and we should
1800  * shift it into the 'tail' of the xdr_buf before processing.
1801  * To do this efficiently, we need to know the total length
1802  * of data received, which doesn't seem to be available outside
1803  * of the RPC layer.
1804  *
1805  * In the case of WRITE, we also want to put the GETATTR after
1806  * the operation -- in this case because we want to make sure
1807  * we get the post-operation mtime and size.  This means that
1808  * we can't use xdr_encode_pages() as written: we need a variant
1809  * of it which would leave room in the 'tail' iovec.
1810  *
1811  * Both of these changes to the XDR layer would in fact be quite
1812  * minor, but I decided to leave them for a subsequent patch.
1813  */
1814 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1815                 unsigned int pgbase, unsigned int pglen)
1816 {
1817         struct nfs4_readlink args = {
1818                 .fh       = NFS_FH(inode),
1819                 .pgbase   = pgbase,
1820                 .pglen    = pglen,
1821                 .pages    = &page,
1822         };
1823         struct rpc_message msg = {
1824                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1825                 .rpc_argp = &args,
1826                 .rpc_resp = NULL,
1827         };
1828
1829         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1830 }
1831
1832 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1833                 unsigned int pgbase, unsigned int pglen)
1834 {
1835         struct nfs4_exception exception = { };
1836         int err;
1837         do {
1838                 err = nfs4_handle_exception(NFS_SERVER(inode),
1839                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1840                                 &exception);
1841         } while (exception.retry);
1842         return err;
1843 }
1844
1845 /*
1846  * Got race?
1847  * We will need to arrange for the VFS layer to provide an atomic open.
1848  * Until then, this create/open method is prone to inefficiency and race
1849  * conditions due to the lookup, create, and open VFS calls from sys_open()
1850  * placed on the wire.
1851  *
1852  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1853  * The file will be opened again in the subsequent VFS open call
1854  * (nfs4_proc_file_open).
1855  *
1856  * The open for read will just hang around to be used by any process that
1857  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1858  */
1859
1860 static int
1861 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1862                  int flags, struct nameidata *nd)
1863 {
1864         struct path path = {
1865                 .mnt = nd->mnt,
1866                 .dentry = dentry,
1867         };
1868         struct nfs4_state *state;
1869         struct rpc_cred *cred;
1870         int status = 0;
1871
1872         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1873         if (IS_ERR(cred)) {
1874                 status = PTR_ERR(cred);
1875                 goto out;
1876         }
1877         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1878         put_rpccred(cred);
1879         if (IS_ERR(state)) {
1880                 status = PTR_ERR(state);
1881                 goto out;
1882         }
1883         d_instantiate(dentry, igrab(state->inode));
1884         if (flags & O_EXCL) {
1885                 struct nfs_fattr fattr;
1886                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1887                 if (status == 0)
1888                         nfs_setattr_update_inode(state->inode, sattr);
1889                 nfs_post_op_update_inode(state->inode, &fattr);
1890         }
1891         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1892                 status = nfs4_intent_set_file(nd, &path, state);
1893         else
1894                 nfs4_close_state(&path, state, flags);
1895 out:
1896         return status;
1897 }
1898
1899 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1900 {
1901         struct nfs_server *server = NFS_SERVER(dir);
1902         struct nfs_removeargs args = {
1903                 .fh = NFS_FH(dir),
1904                 .name.len = name->len,
1905                 .name.name = name->name,
1906                 .bitmask = server->attr_bitmask,
1907         };
1908         struct nfs_removeres res = {
1909                 .server = server,
1910         };
1911         struct rpc_message msg = {
1912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1913                 .rpc_argp = &args,
1914                 .rpc_resp = &res,
1915         };
1916         int                     status;
1917
1918         nfs_fattr_init(&res.dir_attr);
1919         status = rpc_call_sync(server->client, &msg, 0);
1920         if (status == 0) {
1921                 update_changeattr(dir, &res.cinfo);
1922                 nfs_post_op_update_inode(dir, &res.dir_attr);
1923         }
1924         return status;
1925 }
1926
1927 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1928 {
1929         struct nfs4_exception exception = { };
1930         int err;
1931         do {
1932                 err = nfs4_handle_exception(NFS_SERVER(dir),
1933                                 _nfs4_proc_remove(dir, name),
1934                                 &exception);
1935         } while (exception.retry);
1936         return err;
1937 }
1938
1939 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1940 {
1941         struct nfs_server *server = NFS_SERVER(dir);
1942         struct nfs_removeargs *args = msg->rpc_argp;
1943         struct nfs_removeres *res = msg->rpc_resp;
1944
1945         args->bitmask = server->attr_bitmask;
1946         res->server = server;
1947         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1948 }
1949
1950 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1951 {
1952         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1953
1954         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1955                 return 0;
1956         update_changeattr(dir, &res->cinfo);
1957         nfs_post_op_update_inode(dir, &res->dir_attr);
1958         return 1;
1959 }
1960
1961 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1962                 struct inode *new_dir, struct qstr *new_name)
1963 {
1964         struct nfs_server *server = NFS_SERVER(old_dir);
1965         struct nfs4_rename_arg arg = {
1966                 .old_dir = NFS_FH(old_dir),
1967                 .new_dir = NFS_FH(new_dir),
1968                 .old_name = old_name,
1969                 .new_name = new_name,
1970                 .bitmask = server->attr_bitmask,
1971         };
1972         struct nfs_fattr old_fattr, new_fattr;
1973         struct nfs4_rename_res res = {
1974                 .server = server,
1975                 .old_fattr = &old_fattr,
1976                 .new_fattr = &new_fattr,
1977         };
1978         struct rpc_message msg = {
1979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1980                 .rpc_argp = &arg,
1981                 .rpc_resp = &res,
1982         };
1983         int                     status;
1984
1985         nfs_fattr_init(res.old_fattr);
1986         nfs_fattr_init(res.new_fattr);
1987         status = rpc_call_sync(server->client, &msg, 0);
1988
1989         if (!status) {
1990                 update_changeattr(old_dir, &res.old_cinfo);
1991                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1992                 update_changeattr(new_dir, &res.new_cinfo);
1993                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1994         }
1995         return status;
1996 }
1997
1998 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1999                 struct inode *new_dir, struct qstr *new_name)
2000 {
2001         struct nfs4_exception exception = { };
2002         int err;
2003         do {
2004                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2005                                 _nfs4_proc_rename(old_dir, old_name,
2006                                         new_dir, new_name),
2007                                 &exception);
2008         } while (exception.retry);
2009         return err;
2010 }
2011
2012 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2013 {
2014         struct nfs_server *server = NFS_SERVER(inode);
2015         struct nfs4_link_arg arg = {
2016                 .fh     = NFS_FH(inode),
2017                 .dir_fh = NFS_FH(dir),
2018                 .name   = name,
2019                 .bitmask = server->attr_bitmask,
2020         };
2021         struct nfs_fattr fattr, dir_attr;
2022         struct nfs4_link_res res = {
2023                 .server = server,
2024                 .fattr = &fattr,
2025                 .dir_attr = &dir_attr,
2026         };
2027         struct rpc_message msg = {
2028                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2029                 .rpc_argp = &arg,
2030                 .rpc_resp = &res,
2031         };
2032         int                     status;
2033
2034         nfs_fattr_init(res.fattr);
2035         nfs_fattr_init(res.dir_attr);
2036         status = rpc_call_sync(server->client, &msg, 0);
2037         if (!status) {
2038                 update_changeattr(dir, &res.cinfo);
2039                 nfs_post_op_update_inode(dir, res.dir_attr);
2040                 nfs_post_op_update_inode(inode, res.fattr);
2041         }
2042
2043         return status;
2044 }
2045
2046 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2047 {
2048         struct nfs4_exception exception = { };
2049         int err;
2050         do {
2051                 err = nfs4_handle_exception(NFS_SERVER(inode),
2052                                 _nfs4_proc_link(inode, dir, name),
2053                                 &exception);
2054         } while (exception.retry);
2055         return err;
2056 }
2057
2058 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2059                 struct page *page, unsigned int len, struct iattr *sattr)
2060 {
2061         struct nfs_server *server = NFS_SERVER(dir);
2062         struct nfs_fh fhandle;
2063         struct nfs_fattr fattr, dir_fattr;
2064         struct nfs4_create_arg arg = {
2065                 .dir_fh = NFS_FH(dir),
2066                 .server = server,
2067                 .name = &dentry->d_name,
2068                 .attrs = sattr,
2069                 .ftype = NF4LNK,
2070                 .bitmask = server->attr_bitmask,
2071         };
2072         struct nfs4_create_res res = {
2073                 .server = server,
2074                 .fh = &fhandle,
2075                 .fattr = &fattr,
2076                 .dir_fattr = &dir_fattr,
2077         };
2078         struct rpc_message msg = {
2079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2080                 .rpc_argp = &arg,
2081                 .rpc_resp = &res,
2082         };
2083         int                     status;
2084
2085         if (len > NFS4_MAXPATHLEN)
2086                 return -ENAMETOOLONG;
2087
2088         arg.u.symlink.pages = &page;
2089         arg.u.symlink.len = len;
2090         nfs_fattr_init(&fattr);
2091         nfs_fattr_init(&dir_fattr);
2092
2093         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2094         if (!status) {
2095                 update_changeattr(dir, &res.dir_cinfo);
2096                 nfs_post_op_update_inode(dir, res.dir_fattr);
2097                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2098         }
2099         return status;
2100 }
2101
2102 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2103                 struct page *page, unsigned int len, struct iattr *sattr)
2104 {
2105         struct nfs4_exception exception = { };
2106         int err;
2107         do {
2108                 err = nfs4_handle_exception(NFS_SERVER(dir),
2109                                 _nfs4_proc_symlink(dir, dentry, page,
2110                                                         len, sattr),
2111                                 &exception);
2112         } while (exception.retry);
2113         return err;
2114 }
2115
2116 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2117                 struct iattr *sattr)
2118 {
2119         struct nfs_server *server = NFS_SERVER(dir);
2120         struct nfs_fh fhandle;
2121         struct nfs_fattr fattr, dir_fattr;
2122         struct nfs4_create_arg arg = {
2123                 .dir_fh = NFS_FH(dir),
2124                 .server = server,
2125                 .name = &dentry->d_name,
2126                 .attrs = sattr,
2127                 .ftype = NF4DIR,
2128                 .bitmask = server->attr_bitmask,
2129         };
2130         struct nfs4_create_res res = {
2131                 .server = server,
2132                 .fh = &fhandle,
2133                 .fattr = &fattr,
2134                 .dir_fattr = &dir_fattr,
2135         };
2136         struct rpc_message msg = {
2137                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2138                 .rpc_argp = &arg,
2139                 .rpc_resp = &res,
2140         };
2141         int                     status;
2142
2143         nfs_fattr_init(&fattr);
2144         nfs_fattr_init(&dir_fattr);
2145
2146         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2147         if (!status) {
2148                 update_changeattr(dir, &res.dir_cinfo);
2149                 nfs_post_op_update_inode(dir, res.dir_fattr);
2150                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2151         }
2152         return status;
2153 }
2154
2155 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2156                 struct iattr *sattr)
2157 {
2158         struct nfs4_exception exception = { };
2159         int err;
2160         do {
2161                 err = nfs4_handle_exception(NFS_SERVER(dir),
2162                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2163                                 &exception);
2164         } while (exception.retry);
2165         return err;
2166 }
2167
2168 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2169                   u64 cookie, struct page *page, unsigned int count, int plus)
2170 {
2171         struct inode            *dir = dentry->d_inode;
2172         struct nfs4_readdir_arg args = {
2173                 .fh = NFS_FH(dir),
2174                 .pages = &page,
2175                 .pgbase = 0,
2176                 .count = count,
2177                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2178         };
2179         struct nfs4_readdir_res res;
2180         struct rpc_message msg = {
2181                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2182                 .rpc_argp = &args,
2183                 .rpc_resp = &res,
2184                 .rpc_cred = cred,
2185         };
2186         int                     status;
2187
2188         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2189                         dentry->d_parent->d_name.name,
2190                         dentry->d_name.name,
2191                         (unsigned long long)cookie);
2192         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2193         res.pgbase = args.pgbase;
2194         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2195         if (status == 0)
2196                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2197         dprintk("%s: returns %d\n", __FUNCTION__, status);
2198         return status;
2199 }
2200
2201 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2202                   u64 cookie, struct page *page, unsigned int count, int plus)
2203 {
2204         struct nfs4_exception exception = { };
2205         int err;
2206         do {
2207                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2208                                 _nfs4_proc_readdir(dentry, cred, cookie,
2209                                         page, count, plus),
2210                                 &exception);
2211         } while (exception.retry);
2212         return err;
2213 }
2214
2215 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2216                 struct iattr *sattr, dev_t rdev)
2217 {
2218         struct nfs_server *server = NFS_SERVER(dir);
2219         struct nfs_fh fh;
2220         struct nfs_fattr fattr, dir_fattr;
2221         struct nfs4_create_arg arg = {
2222                 .dir_fh = NFS_FH(dir),
2223                 .server = server,
2224                 .name = &dentry->d_name,
2225                 .attrs = sattr,
2226                 .bitmask = server->attr_bitmask,
2227         };
2228         struct nfs4_create_res res = {
2229                 .server = server,
2230                 .fh = &fh,
2231                 .fattr = &fattr,
2232                 .dir_fattr = &dir_fattr,
2233         };
2234         struct rpc_message msg = {
2235                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2236                 .rpc_argp = &arg,
2237                 .rpc_resp = &res,
2238         };
2239         int                     status;
2240         int                     mode = sattr->ia_mode;
2241
2242         nfs_fattr_init(&fattr);
2243         nfs_fattr_init(&dir_fattr);
2244
2245         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2246         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2247         if (S_ISFIFO(mode))
2248                 arg.ftype = NF4FIFO;
2249         else if (S_ISBLK(mode)) {
2250                 arg.ftype = NF4BLK;
2251                 arg.u.device.specdata1 = MAJOR(rdev);
2252                 arg.u.device.specdata2 = MINOR(rdev);
2253         }
2254         else if (S_ISCHR(mode)) {
2255                 arg.ftype = NF4CHR;
2256                 arg.u.device.specdata1 = MAJOR(rdev);
2257                 arg.u.device.specdata2 = MINOR(rdev);
2258         }
2259         else
2260                 arg.ftype = NF4SOCK;
2261
2262         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2263         if (status == 0) {
2264                 update_changeattr(dir, &res.dir_cinfo);
2265                 nfs_post_op_update_inode(dir, res.dir_fattr);
2266                 status = nfs_instantiate(dentry, &fh, &fattr);
2267         }
2268         return status;
2269 }
2270
2271 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2272                 struct iattr *sattr, dev_t rdev)
2273 {
2274         struct nfs4_exception exception = { };
2275         int err;
2276         do {
2277                 err = nfs4_handle_exception(NFS_SERVER(dir),
2278                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2279                                 &exception);
2280         } while (exception.retry);
2281         return err;
2282 }
2283
2284 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2285                  struct nfs_fsstat *fsstat)
2286 {
2287         struct nfs4_statfs_arg args = {
2288                 .fh = fhandle,
2289                 .bitmask = server->attr_bitmask,
2290         };
2291         struct rpc_message msg = {
2292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2293                 .rpc_argp = &args,
2294                 .rpc_resp = fsstat,
2295         };
2296
2297         nfs_fattr_init(fsstat->fattr);
2298         return rpc_call_sync(server->client, &msg, 0);
2299 }
2300
2301 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2302 {
2303         struct nfs4_exception exception = { };
2304         int err;
2305         do {
2306                 err = nfs4_handle_exception(server,
2307                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2308                                 &exception);
2309         } while (exception.retry);
2310         return err;
2311 }
2312
2313 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2314                 struct nfs_fsinfo *fsinfo)
2315 {
2316         struct nfs4_fsinfo_arg args = {
2317                 .fh = fhandle,
2318                 .bitmask = server->attr_bitmask,
2319         };
2320         struct rpc_message msg = {
2321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2322                 .rpc_argp = &args,
2323                 .rpc_resp = fsinfo,
2324         };
2325
2326         return rpc_call_sync(server->client, &msg, 0);
2327 }
2328
2329 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2330 {
2331         struct nfs4_exception exception = { };
2332         int err;
2333
2334         do {
2335                 err = nfs4_handle_exception(server,
2336                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2337                                 &exception);
2338         } while (exception.retry);
2339         return err;
2340 }
2341
2342 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2343 {
2344         nfs_fattr_init(fsinfo->fattr);
2345         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2346 }
2347
2348 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2349                 struct nfs_pathconf *pathconf)
2350 {
2351         struct nfs4_pathconf_arg args = {
2352                 .fh = fhandle,
2353                 .bitmask = server->attr_bitmask,
2354         };
2355         struct rpc_message msg = {
2356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2357                 .rpc_argp = &args,
2358                 .rpc_resp = pathconf,
2359         };
2360
2361         /* None of the pathconf attributes are mandatory to implement */
2362         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2363                 memset(pathconf, 0, sizeof(*pathconf));
2364                 return 0;
2365         }
2366
2367         nfs_fattr_init(pathconf->fattr);
2368         return rpc_call_sync(server->client, &msg, 0);
2369 }
2370
2371 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2372                 struct nfs_pathconf *pathconf)
2373 {
2374         struct nfs4_exception exception = { };
2375         int err;
2376
2377         do {
2378                 err = nfs4_handle_exception(server,
2379                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2380                                 &exception);
2381         } while (exception.retry);
2382         return err;
2383 }
2384
2385 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2386 {
2387         struct nfs_server *server = NFS_SERVER(data->inode);
2388
2389         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2390                 rpc_restart_call(task);
2391                 return -EAGAIN;
2392         }
2393         if (task->tk_status > 0)
2394                 renew_lease(server, data->timestamp);
2395         return 0;
2396 }
2397
2398 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2399 {
2400         struct rpc_message msg = {
2401                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2402                 .rpc_argp = &data->args,
2403                 .rpc_resp = &data->res,
2404                 .rpc_cred = data->cred,
2405         };
2406
2407         data->timestamp   = jiffies;
2408
2409         rpc_call_setup(&data->task, &msg, 0);
2410 }
2411
2412 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2413 {
2414         struct inode *inode = data->inode;
2415
2416         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2417                 rpc_restart_call(task);
2418                 return -EAGAIN;
2419         }
2420         if (task->tk_status >= 0) {
2421                 renew_lease(NFS_SERVER(inode), data->timestamp);
2422                 nfs_post_op_update_inode(inode, data->res.fattr);
2423         }
2424         return 0;
2425 }
2426
2427 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2428 {
2429         struct rpc_message msg = {
2430                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2431                 .rpc_argp = &data->args,
2432                 .rpc_resp = &data->res,
2433                 .rpc_cred = data->cred,
2434         };
2435         struct inode *inode = data->inode;
2436         struct nfs_server *server = NFS_SERVER(inode);
2437         int stable;
2438
2439         if (how & FLUSH_STABLE) {
2440                 if (!NFS_I(inode)->ncommit)
2441                         stable = NFS_FILE_SYNC;
2442                 else
2443                         stable = NFS_DATA_SYNC;
2444         } else
2445                 stable = NFS_UNSTABLE;
2446         data->args.stable = stable;
2447         data->args.bitmask = server->attr_bitmask;
2448         data->res.server = server;
2449
2450         data->timestamp   = jiffies;
2451
2452         /* Finalize the task. */
2453         rpc_call_setup(&data->task, &msg, 0);
2454 }
2455
2456 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2457 {
2458         struct inode *inode = data->inode;
2459
2460         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2461                 rpc_restart_call(task);
2462                 return -EAGAIN;
2463         }
2464         if (task->tk_status >= 0)
2465                 nfs_post_op_update_inode(inode, data->res.fattr);
2466         return 0;
2467 }
2468
2469 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2470 {
2471         struct rpc_message msg = {
2472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2473                 .rpc_argp = &data->args,
2474                 .rpc_resp = &data->res,
2475                 .rpc_cred = data->cred,
2476         };
2477         struct nfs_server *server = NFS_SERVER(data->inode);
2478
2479         data->args.bitmask = server->attr_bitmask;
2480         data->res.server = server;
2481
2482         rpc_call_setup(&data->task, &msg, 0);
2483 }
2484
2485 /*
2486  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2487  * standalone procedure for queueing an asynchronous RENEW.
2488  */
2489 static void nfs4_renew_done(struct rpc_task *task, void *data)
2490 {
2491         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2492         unsigned long timestamp = (unsigned long)data;
2493
2494         if (task->tk_status < 0) {
2495                 switch (task->tk_status) {
2496                         case -NFS4ERR_STALE_CLIENTID:
2497                         case -NFS4ERR_EXPIRED:
2498                         case -NFS4ERR_CB_PATH_DOWN:
2499                                 nfs4_schedule_state_recovery(clp);
2500                 }
2501                 return;
2502         }
2503         spin_lock(&clp->cl_lock);
2504         if (time_before(clp->cl_last_renewal,timestamp))
2505                 clp->cl_last_renewal = timestamp;
2506         spin_unlock(&clp->cl_lock);
2507 }
2508
2509 static const struct rpc_call_ops nfs4_renew_ops = {
2510         .rpc_call_done = nfs4_renew_done,
2511 };
2512
2513 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2514 {
2515         struct rpc_message msg = {
2516                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2517                 .rpc_argp       = clp,
2518                 .rpc_cred       = cred,
2519         };
2520
2521         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2522                         &nfs4_renew_ops, (void *)jiffies);
2523 }
2524
2525 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2526 {
2527         struct rpc_message msg = {
2528                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2529                 .rpc_argp       = clp,
2530                 .rpc_cred       = cred,
2531         };
2532         unsigned long now = jiffies;
2533         int status;
2534
2535         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2536         if (status < 0)
2537                 return status;
2538         spin_lock(&clp->cl_lock);
2539         if (time_before(clp->cl_last_renewal,now))
2540                 clp->cl_last_renewal = now;
2541         spin_unlock(&clp->cl_lock);
2542         return 0;
2543 }
2544
2545 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2546 {
2547         return (server->caps & NFS_CAP_ACLS)
2548                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2549                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2550 }
2551
2552 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2553  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2554  * the stack.
2555  */
2556 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2557
2558 static void buf_to_pages(const void *buf, size_t buflen,
2559                 struct page **pages, unsigned int *pgbase)
2560 {
2561         const void *p = buf;
2562
2563         *pgbase = offset_in_page(buf);
2564         p -= *pgbase;
2565         while (p < buf + buflen) {
2566                 *(pages++) = virt_to_page(p);
2567                 p += PAGE_CACHE_SIZE;
2568         }
2569 }
2570
2571 struct nfs4_cached_acl {
2572         int cached;
2573         size_t len;
2574         char data[0];
2575 };
2576
2577 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2578 {
2579         struct nfs_inode *nfsi = NFS_I(inode);
2580
2581         spin_lock(&inode->i_lock);
2582         kfree(nfsi->nfs4_acl);
2583         nfsi->nfs4_acl = acl;
2584         spin_unlock(&inode->i_lock);
2585 }
2586
2587 static void nfs4_zap_acl_attr(struct inode *inode)
2588 {
2589         nfs4_set_cached_acl(inode, NULL);
2590 }
2591
2592 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2593 {
2594         struct nfs_inode *nfsi = NFS_I(inode);
2595         struct nfs4_cached_acl *acl;
2596         int ret = -ENOENT;
2597
2598         spin_lock(&inode->i_lock);
2599         acl = nfsi->nfs4_acl;
2600         if (acl == NULL)
2601                 goto out;
2602         if (buf == NULL) /* user is just asking for length */
2603                 goto out_len;
2604         if (acl->cached == 0)
2605                 goto out;
2606         ret = -ERANGE; /* see getxattr(2) man page */
2607         if (acl->len > buflen)
2608                 goto out;
2609         memcpy(buf, acl->data, acl->len);
2610 out_len:
2611         ret = acl->len;
2612 out:
2613         spin_unlock(&inode->i_lock);
2614         return ret;
2615 }
2616
2617 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2618 {
2619         struct nfs4_cached_acl *acl;
2620
2621         if (buf && acl_len <= PAGE_SIZE) {
2622                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2623                 if (acl == NULL)
2624                         goto out;
2625                 acl->cached = 1;
2626                 memcpy(acl->data, buf, acl_len);
2627         } else {
2628                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2629                 if (acl == NULL)
2630                         goto out;
2631                 acl->cached = 0;
2632         }
2633         acl->len = acl_len;
2634 out:
2635         nfs4_set_cached_acl(inode, acl);
2636 }
2637
2638 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2639 {
2640         struct page *pages[NFS4ACL_MAXPAGES];
2641         struct nfs_getaclargs args = {
2642                 .fh = NFS_FH(inode),
2643                 .acl_pages = pages,
2644                 .acl_len = buflen,
2645         };
2646         size_t resp_len = buflen;
2647         void *resp_buf;
2648         struct rpc_message msg = {
2649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2650                 .rpc_argp = &args,
2651                 .rpc_resp = &resp_len,
2652         };
2653         struct page *localpage = NULL;
2654         int ret;
2655
2656         if (buflen < PAGE_SIZE) {
2657                 /* As long as we're doing a round trip to the server anyway,
2658                  * let's be prepared for a page of acl data. */
2659                 localpage = alloc_page(GFP_KERNEL);
2660                 resp_buf = page_address(localpage);
2661                 if (localpage == NULL)
2662                         return -ENOMEM;
2663                 args.acl_pages[0] = localpage;
2664                 args.acl_pgbase = 0;
2665                 resp_len = args.acl_len = PAGE_SIZE;
2666         } else {
2667                 resp_buf = buf;
2668                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2669         }
2670         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2671         if (ret)
2672                 goto out_free;
2673         if (resp_len > args.acl_len)
2674                 nfs4_write_cached_acl(inode, NULL, resp_len);
2675         else
2676                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2677         if (buf) {
2678                 ret = -ERANGE;
2679                 if (resp_len > buflen)
2680                         goto out_free;
2681                 if (localpage)
2682                         memcpy(buf, resp_buf, resp_len);
2683         }
2684         ret = resp_len;
2685 out_free:
2686         if (localpage)
2687                 __free_page(localpage);
2688         return ret;
2689 }
2690
2691 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2692 {
2693         struct nfs4_exception exception = { };
2694         ssize_t ret;
2695         do {
2696                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2697                 if (ret >= 0)
2698                         break;
2699                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2700         } while (exception.retry);
2701         return ret;
2702 }
2703
2704 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2705 {
2706         struct nfs_server *server = NFS_SERVER(inode);
2707         int ret;
2708
2709         if (!nfs4_server_supports_acls(server))
2710                 return -EOPNOTSUPP;
2711         ret = nfs_revalidate_inode(server, inode);
2712         if (ret < 0)
2713                 return ret;
2714         ret = nfs4_read_cached_acl(inode, buf, buflen);
2715         if (ret != -ENOENT)
2716                 return ret;
2717         return nfs4_get_acl_uncached(inode, buf, buflen);
2718 }
2719
2720 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2721 {
2722         struct nfs_server *server = NFS_SERVER(inode);
2723         struct page *pages[NFS4ACL_MAXPAGES];
2724         struct nfs_setaclargs arg = {
2725                 .fh             = NFS_FH(inode),
2726                 .acl_pages      = pages,
2727                 .acl_len        = buflen,
2728         };
2729         struct rpc_message msg = {
2730                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2731                 .rpc_argp       = &arg,
2732                 .rpc_resp       = NULL,
2733         };
2734         int ret;
2735
2736         if (!nfs4_server_supports_acls(server))
2737                 return -EOPNOTSUPP;
2738         nfs_inode_return_delegation(inode);
2739         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2740         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2741         nfs_zap_caches(inode);
2742         return ret;
2743 }
2744
2745 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2746 {
2747         struct nfs4_exception exception = { };
2748         int err;
2749         do {
2750                 err = nfs4_handle_exception(NFS_SERVER(inode),
2751                                 __nfs4_proc_set_acl(inode, buf, buflen),
2752                                 &exception);
2753         } while (exception.retry);
2754         return err;
2755 }
2756
2757 static int
2758 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2759 {
2760         struct nfs_client *clp = server->nfs_client;
2761
2762         if (!clp || task->tk_status >= 0)
2763                 return 0;
2764         switch(task->tk_status) {
2765                 case -NFS4ERR_STALE_CLIENTID:
2766                 case -NFS4ERR_STALE_STATEID:
2767                 case -NFS4ERR_EXPIRED:
2768                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2769                         nfs4_schedule_state_recovery(clp);
2770                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2771                                 rpc_wake_up_task(task);
2772                         task->tk_status = 0;
2773                         return -EAGAIN;
2774                 case -NFS4ERR_DELAY:
2775                         nfs_inc_server_stats((struct nfs_server *) server,
2776                                                 NFSIOS_DELAY);
2777                 case -NFS4ERR_GRACE:
2778                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2779                         task->tk_status = 0;
2780                         return -EAGAIN;
2781                 case -NFS4ERR_OLD_STATEID:
2782                         task->tk_status = 0;
2783                         return -EAGAIN;
2784         }
2785         task->tk_status = nfs4_map_errors(task->tk_status);
2786         return 0;
2787 }
2788
2789 static int nfs4_wait_bit_interruptible(void *word)
2790 {
2791         if (signal_pending(current))
2792                 return -ERESTARTSYS;
2793         schedule();
2794         return 0;
2795 }
2796
2797 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2798 {
2799         sigset_t oldset;
2800         int res;
2801
2802         might_sleep();
2803
2804         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2805
2806         rpc_clnt_sigmask(clnt, &oldset);
2807         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2808                         nfs4_wait_bit_interruptible,
2809                         TASK_INTERRUPTIBLE);
2810         rpc_clnt_sigunmask(clnt, &oldset);
2811
2812         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2813         return res;
2814 }
2815
2816 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2817 {
2818         sigset_t oldset;
2819         int res = 0;
2820
2821         might_sleep();
2822
2823         if (*timeout <= 0)
2824                 *timeout = NFS4_POLL_RETRY_MIN;
2825         if (*timeout > NFS4_POLL_RETRY_MAX)
2826                 *timeout = NFS4_POLL_RETRY_MAX;
2827         rpc_clnt_sigmask(clnt, &oldset);
2828         if (clnt->cl_intr) {
2829                 schedule_timeout_interruptible(*timeout);
2830                 if (signalled())
2831                         res = -ERESTARTSYS;
2832         } else
2833                 schedule_timeout_uninterruptible(*timeout);
2834         rpc_clnt_sigunmask(clnt, &oldset);
2835         *timeout <<= 1;
2836         return res;
2837 }
2838
2839 /* This is the error handling routine for processes that are allowed
2840  * to sleep.
2841  */
2842 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2843 {
2844         struct nfs_client *clp = server->nfs_client;
2845         int ret = errorcode;
2846
2847         exception->retry = 0;
2848         switch(errorcode) {
2849                 case 0:
2850                         return 0;
2851                 case -NFS4ERR_STALE_CLIENTID:
2852                 case -NFS4ERR_STALE_STATEID:
2853                 case -NFS4ERR_EXPIRED:
2854                         nfs4_schedule_state_recovery(clp);
2855                         ret = nfs4_wait_clnt_recover(server->client, clp);
2856                         if (ret == 0)
2857                                 exception->retry = 1;
2858                         break;
2859                 case -NFS4ERR_FILE_OPEN:
2860                 case -NFS4ERR_GRACE:
2861                 case -NFS4ERR_DELAY:
2862                         ret = nfs4_delay(server->client, &exception->timeout);
2863                         if (ret != 0)
2864                                 break;
2865                 case -NFS4ERR_OLD_STATEID:
2866                         exception->retry = 1;
2867         }
2868         /* We failed to handle the error */
2869         return nfs4_map_errors(ret);
2870 }
2871
2872 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2873 {
2874         nfs4_verifier sc_verifier;
2875         struct nfs4_setclientid setclientid = {
2876                 .sc_verifier = &sc_verifier,
2877                 .sc_prog = program,
2878         };
2879         struct rpc_message msg = {
2880                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2881                 .rpc_argp = &setclientid,
2882                 .rpc_resp = clp,
2883                 .rpc_cred = cred,
2884         };
2885         __be32 *p;
2886         int loop = 0;
2887         int status;
2888
2889         p = (__be32*)sc_verifier.data;
2890         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2891         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2892
2893         for(;;) {
2894                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2895                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2896                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2897                                 cred->cr_ops->cr_name,
2898                                 clp->cl_id_uniquifier);
2899                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2900                                 sizeof(setclientid.sc_netid), "tcp");
2901                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2902                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2903                                 clp->cl_ipaddr, port >> 8, port & 255);
2904
2905                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2906                 if (status != -NFS4ERR_CLID_INUSE)
2907                         break;
2908                 if (signalled())
2909                         break;
2910                 if (loop++ & 1)
2911                         ssleep(clp->cl_lease_time + 1);
2912                 else
2913                         if (++clp->cl_id_uniquifier == 0)
2914                                 break;
2915         }
2916         return status;
2917 }
2918
2919 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2920 {
2921         struct nfs_fsinfo fsinfo;
2922         struct rpc_message msg = {
2923                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2924                 .rpc_argp = clp,
2925                 .rpc_resp = &fsinfo,
2926                 .rpc_cred = cred,
2927         };
2928         unsigned long now;
2929         int status;
2930
2931         now = jiffies;
2932         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2933         if (status == 0) {
2934                 spin_lock(&clp->cl_lock);
2935                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2936                 clp->cl_last_renewal = now;
2937                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2938                 spin_unlock(&clp->cl_lock);
2939         }
2940         return status;
2941 }
2942
2943 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2944 {
2945         long timeout;
2946         int err;
2947         do {
2948                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2949                 switch (err) {
2950                         case 0:
2951                                 return err;
2952                         case -NFS4ERR_RESOURCE:
2953                                 /* The IBM lawyers misread another document! */
2954                         case -NFS4ERR_DELAY:
2955                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2956                 }
2957         } while (err == 0);
2958         return err;
2959 }
2960
2961 struct nfs4_delegreturndata {
2962         struct nfs4_delegreturnargs args;
2963         struct nfs4_delegreturnres res;
2964         struct nfs_fh fh;
2965         nfs4_stateid stateid;
2966         struct rpc_cred *cred;
2967         unsigned long timestamp;
2968         struct nfs_fattr fattr;
2969         int rpc_status;
2970 };
2971
2972 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2973 {
2974         struct nfs4_delegreturndata *data = calldata;
2975         struct rpc_message msg = {
2976                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2977                 .rpc_argp = &data->args,
2978                 .rpc_resp = &data->res,
2979                 .rpc_cred = data->cred,
2980         };
2981         nfs_fattr_init(data->res.fattr);
2982         rpc_call_setup(task, &msg, 0);
2983 }
2984
2985 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2986 {
2987         struct nfs4_delegreturndata *data = calldata;
2988         data->rpc_status = task->tk_status;
2989         if (data->rpc_status == 0)
2990                 renew_lease(data->res.server, data->timestamp);
2991 }
2992
2993 static void nfs4_delegreturn_release(void *calldata)
2994 {
2995         struct nfs4_delegreturndata *data = calldata;
2996
2997         put_rpccred(data->cred);
2998         kfree(calldata);
2999 }
3000
3001 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3002         .rpc_call_prepare = nfs4_delegreturn_prepare,
3003         .rpc_call_done = nfs4_delegreturn_done,
3004         .rpc_release = nfs4_delegreturn_release,
3005 };
3006
3007 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3008 {
3009         struct nfs4_delegreturndata *data;
3010         struct nfs_server *server = NFS_SERVER(inode);
3011         struct rpc_task *task;
3012         int status;
3013
3014         data = kmalloc(sizeof(*data), GFP_KERNEL);
3015         if (data == NULL)
3016                 return -ENOMEM;
3017         data->args.fhandle = &data->fh;
3018         data->args.stateid = &data->stateid;
3019         data->args.bitmask = server->attr_bitmask;
3020         nfs_copy_fh(&data->fh, NFS_FH(inode));
3021         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3022         data->res.fattr = &data->fattr;
3023         data->res.server = server;
3024         data->cred = get_rpccred(cred);
3025         data->timestamp = jiffies;
3026         data->rpc_status = 0;
3027
3028         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3029         if (IS_ERR(task))
3030                 return PTR_ERR(task);
3031         status = nfs4_wait_for_completion_rpc_task(task);
3032         if (status == 0) {
3033                 status = data->rpc_status;
3034                 if (status == 0)
3035                         nfs_post_op_update_inode(inode, &data->fattr);
3036         }
3037         rpc_put_task(task);
3038         return status;
3039 }
3040
3041 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3042 {
3043         struct nfs_server *server = NFS_SERVER(inode);
3044         struct nfs4_exception exception = { };
3045         int err;
3046         do {
3047                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3048                 switch (err) {
3049                         case -NFS4ERR_STALE_STATEID:
3050                         case -NFS4ERR_EXPIRED:
3051                         case 0:
3052                                 return 0;
3053                 }
3054                 err = nfs4_handle_exception(server, err, &exception);
3055         } while (exception.retry);
3056         return err;
3057 }
3058
3059 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3060 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3061
3062 /*
3063  * sleep, with exponential backoff, and retry the LOCK operation.
3064  */
3065 static unsigned long
3066 nfs4_set_lock_task_retry(unsigned long timeout)
3067 {
3068         schedule_timeout_interruptible(timeout);
3069         timeout <<= 1;
3070         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3071                 return NFS4_LOCK_MAXTIMEOUT;
3072         return timeout;
3073 }
3074
3075 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3076 {
3077         struct inode *inode = state->inode;
3078         struct nfs_server *server = NFS_SERVER(inode);
3079         struct nfs_client *clp = server->nfs_client;
3080         struct nfs_lockt_args arg = {
3081                 .fh = NFS_FH(inode),
3082                 .fl = request,
3083         };
3084         struct nfs_lockt_res res = {
3085                 .denied = request,
3086         };
3087         struct rpc_message msg = {
3088                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3089                 .rpc_argp       = &arg,
3090                 .rpc_resp       = &res,
3091                 .rpc_cred       = state->owner->so_cred,
3092         };
3093         struct nfs4_lock_state *lsp;
3094         int status;
3095
3096         down_read(&clp->cl_sem);
3097         arg.lock_owner.clientid = clp->cl_clientid;
3098         status = nfs4_set_lock_state(state, request);
3099         if (status != 0)
3100                 goto out;
3101         lsp = request->fl_u.nfs4_fl.owner;
3102         arg.lock_owner.id = lsp->ls_id.id;
3103         status = rpc_call_sync(server->client, &msg, 0);
3104         switch (status) {
3105                 case 0:
3106                         request->fl_type = F_UNLCK;
3107                         break;
3108                 case -NFS4ERR_DENIED:
3109                         status = 0;
3110         }
3111         request->fl_ops->fl_release_private(request);
3112 out:
3113         up_read(&clp->cl_sem);
3114         return status;
3115 }
3116
3117 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3118 {
3119         struct nfs4_exception exception = { };
3120         int err;
3121
3122         do {
3123                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3124                                 _nfs4_proc_getlk(state, cmd, request),
3125                                 &exception);
3126         } while (exception.retry);
3127         return err;
3128 }
3129
3130 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3131 {
3132         int res = 0;
3133         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3134                 case FL_POSIX:
3135                         res = posix_lock_file_wait(file, fl);
3136                         break;
3137                 case FL_FLOCK:
3138                         res = flock_lock_file_wait(file, fl);
3139                         break;
3140                 default:
3141                         BUG();
3142         }
3143         return res;
3144 }
3145
3146 struct nfs4_unlockdata {
3147         struct nfs_locku_args arg;
3148         struct nfs_locku_res res;
3149         struct nfs4_lock_state *lsp;
3150         struct nfs_open_context *ctx;
3151         struct file_lock fl;
3152         const struct nfs_server *server;
3153         unsigned long timestamp;
3154 };
3155
3156 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3157                 struct nfs_open_context *ctx,
3158                 struct nfs4_lock_state *lsp,
3159                 struct nfs_seqid *seqid)
3160 {
3161         struct nfs4_unlockdata *p;
3162         struct inode *inode = lsp->ls_state->inode;
3163
3164         p = kmalloc(sizeof(*p), GFP_KERNEL);
3165         if (p == NULL)
3166                 return NULL;
3167         p->arg.fh = NFS_FH(inode);
3168         p->arg.fl = &p->fl;
3169         p->arg.seqid = seqid;
3170         p->arg.stateid = &lsp->ls_stateid;
3171         p->lsp = lsp;
3172         atomic_inc(&lsp->ls_count);
3173         /* Ensure we don't close file until we're done freeing locks! */
3174         p->ctx = get_nfs_open_context(ctx);
3175         memcpy(&p->fl, fl, sizeof(p->fl));
3176         p->server = NFS_SERVER(inode);
3177         return p;
3178 }
3179
3180 static void nfs4_locku_release_calldata(void *data)
3181 {
3182         struct nfs4_unlockdata *calldata = data;
3183         nfs_free_seqid(calldata->arg.seqid);
3184         nfs4_put_lock_state(calldata->lsp);
3185         put_nfs_open_context(calldata->ctx);
3186         kfree(calldata);
3187 }
3188
3189 static void nfs4_locku_done(struct rpc_task *task, void *data)
3190 {
3191         struct nfs4_unlockdata *calldata = data;
3192
3193         if (RPC_ASSASSINATED(task))
3194                 return;
3195         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3196         switch (task->tk_status) {
3197                 case 0:
3198                         memcpy(calldata->lsp->ls_stateid.data,
3199                                         calldata->res.stateid.data,
3200                                         sizeof(calldata->lsp->ls_stateid.data));
3201                         renew_lease(calldata->server, calldata->timestamp);
3202                         break;
3203                 case -NFS4ERR_STALE_STATEID:
3204                 case -NFS4ERR_EXPIRED:
3205                         break;
3206                 default:
3207                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3208                                 rpc_restart_call(task);
3209         }
3210 }
3211
3212 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3213 {
3214         struct nfs4_unlockdata *calldata = data;
3215         struct rpc_message msg = {
3216                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3217                 .rpc_argp       = &calldata->arg,
3218                 .rpc_resp       = &calldata->res,
3219                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3220         };
3221
3222         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3223                 return;
3224         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3225                 /* Note: exit _without_ running nfs4_locku_done */
3226                 task->tk_action = NULL;
3227                 return;
3228         }
3229         calldata->timestamp = jiffies;
3230         rpc_call_setup(task, &msg, 0);
3231 }
3232
3233 static const struct rpc_call_ops nfs4_locku_ops = {
3234         .rpc_call_prepare = nfs4_locku_prepare,
3235         .rpc_call_done = nfs4_locku_done,
3236         .rpc_release = nfs4_locku_release_calldata,
3237 };
3238
3239 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3240                 struct nfs_open_context *ctx,
3241                 struct nfs4_lock_state *lsp,
3242                 struct nfs_seqid *seqid)
3243 {
3244         struct nfs4_unlockdata *data;
3245
3246         /* Ensure this is an unlock - when canceling a lock, the
3247          * canceled lock is passed in, and it won't be an unlock.
3248          */
3249         fl->fl_type = F_UNLCK;
3250
3251         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3252         if (data == NULL) {
3253                 nfs_free_seqid(seqid);
3254                 return ERR_PTR(-ENOMEM);
3255         }
3256
3257         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3258 }
3259
3260 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3261 {
3262         struct nfs_seqid *seqid;
3263         struct nfs4_lock_state *lsp;
3264         struct rpc_task *task;
3265         int status = 0;
3266
3267         status = nfs4_set_lock_state(state, request);
3268         /* Unlock _before_ we do the RPC call */
3269         request->fl_flags |= FL_EXISTS;
3270         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3271                 goto out;
3272         if (status != 0)
3273                 goto out;
3274         /* Is this a delegated lock? */
3275         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3276                 goto out;
3277         lsp = request->fl_u.nfs4_fl.owner;
3278         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3279         status = -ENOMEM;
3280         if (seqid == NULL)
3281                 goto out;
3282         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3283         status = PTR_ERR(task);
3284         if (IS_ERR(task))
3285                 goto out;
3286         status = nfs4_wait_for_completion_rpc_task(task);
3287         rpc_put_task(task);
3288 out:
3289         return status;
3290 }
3291
3292 struct nfs4_lockdata {
3293         struct nfs_lock_args arg;
3294         struct nfs_lock_res res;
3295         struct nfs4_lock_state *lsp;
3296         struct nfs_open_context *ctx;
3297         struct file_lock fl;
3298         unsigned long timestamp;
3299         int rpc_status;
3300         int cancelled;
3301 };
3302
3303 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3304                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3305 {
3306         struct nfs4_lockdata *p;
3307         struct inode *inode = lsp->ls_state->inode;
3308         struct nfs_server *server = NFS_SERVER(inode);
3309
3310         p = kzalloc(sizeof(*p), GFP_KERNEL);
3311         if (p == NULL)
3312                 return NULL;
3313
3314         p->arg.fh = NFS_FH(inode);
3315         p->arg.fl = &p->fl;
3316         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3317         if (p->arg.lock_seqid == NULL)
3318                 goto out_free;
3319         p->arg.lock_stateid = &lsp->ls_stateid;
3320         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3321         p->arg.lock_owner.id = lsp->ls_id.id;
3322         p->lsp = lsp;
3323         atomic_inc(&lsp->ls_count);
3324         p->ctx = get_nfs_open_context(ctx);
3325         memcpy(&p->fl, fl, sizeof(p->fl));
3326         return p;
3327 out_free:
3328         kfree(p);
3329         return NULL;
3330 }
3331
3332 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3333 {
3334         struct nfs4_lockdata *data = calldata;
3335         struct nfs4_state *state = data->lsp->ls_state;
3336         struct nfs4_state_owner *sp = state->owner;
3337         struct rpc_message msg = {
3338                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3339                 .rpc_argp = &data->arg,
3340                 .rpc_resp = &data->res,
3341                 .rpc_cred = sp->so_cred,
3342         };
3343
3344         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3345                 return;
3346         dprintk("%s: begin!\n", __FUNCTION__);
3347         /* Do we need to do an open_to_lock_owner? */
3348         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3349                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3350                 if (data->arg.open_seqid == NULL) {
3351                         data->rpc_status = -ENOMEM;
3352                         task->tk_action = NULL;
3353                         goto out;
3354                 }
3355                 data->arg.open_stateid = &state->stateid;
3356                 data->arg.new_lock_owner = 1;
3357         }
3358         data->timestamp = jiffies;
3359         rpc_call_setup(task, &msg, 0);
3360 out:
3361         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3362 }
3363
3364 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3365 {
3366         struct nfs4_lockdata *data = calldata;
3367
3368         dprintk("%s: begin!\n", __FUNCTION__);
3369
3370         data->rpc_status = task->tk_status;
3371         if (RPC_ASSASSINATED(task))
3372                 goto out;
3373         if (data->arg.new_lock_owner != 0) {
3374                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3375                 if (data->rpc_status == 0)
3376                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3377                 else
3378                         goto out;
3379         }
3380         if (data->rpc_status == 0) {
3381                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3382                                         sizeof(data->lsp->ls_stateid.data));
3383                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3384                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3385         }
3386         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3387 out:
3388         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3389 }
3390
3391 static void nfs4_lock_release(void *calldata)
3392 {
3393         struct nfs4_lockdata *data = calldata;
3394
3395         dprintk("%s: begin!\n", __FUNCTION__);
3396         if (data->arg.open_seqid != NULL)
3397                 nfs_free_seqid(data->arg.open_seqid);
3398         if (data->cancelled != 0) {
3399                 struct rpc_task *task;
3400                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3401                                 data->arg.lock_seqid);
3402                 if (!IS_ERR(task))
3403                         rpc_put_task(task);
3404                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3405         } else
3406                 nfs_free_seqid(data->arg.lock_seqid);
3407         nfs4_put_lock_state(data->lsp);
3408         put_nfs_open_context(data->ctx);
3409         kfree(data);
3410         dprintk("%s: done!\n", __FUNCTION__);
3411 }
3412
3413 static const struct rpc_call_ops nfs4_lock_ops = {
3414         .rpc_call_prepare = nfs4_lock_prepare,
3415         .rpc_call_done = nfs4_lock_done,
3416         .rpc_release = nfs4_lock_release,
3417 };
3418
3419 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3420 {
3421         struct nfs4_lockdata *data;
3422         struct rpc_task *task;
3423         int ret;
3424
3425         dprintk("%s: begin!\n", __FUNCTION__);
3426         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3427                         fl->fl_u.nfs4_fl.owner);
3428         if (data == NULL)
3429                 return -ENOMEM;
3430         if (IS_SETLKW(cmd))
3431                 data->arg.block = 1;
3432         if (reclaim != 0)
3433                 data->arg.reclaim = 1;
3434         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3435                         &nfs4_lock_ops, data);
3436         if (IS_ERR(task))
3437                 return PTR_ERR(task);
3438         ret = nfs4_wait_for_completion_rpc_task(task);
3439         if (ret == 0) {
3440                 ret = data->rpc_status;
3441                 if (ret == -NFS4ERR_DENIED)
3442                         ret = -EAGAIN;
3443         } else
3444                 data->cancelled = 1;
3445         rpc_put_task(task);
3446         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3447         return ret;
3448 }
3449
3450 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3451 {
3452         struct nfs_server *server = NFS_SERVER(state->inode);
3453         struct nfs4_exception exception = { };
3454         int err;
3455
3456         do {
3457                 /* Cache the lock if possible... */
3458                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3459                         return 0;
3460                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3461                 if (err != -NFS4ERR_DELAY)
3462                         break;
3463                 nfs4_handle_exception(server, err, &exception);
3464         } while (exception.retry);
3465         return err;
3466 }
3467
3468 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3469 {
3470         struct nfs_server *server = NFS_SERVER(state->inode);
3471         struct nfs4_exception exception = { };
3472         int err;
3473
3474         err = nfs4_set_lock_state(state, request);
3475         if (err != 0)
3476                 return err;
3477         do {
3478                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3479                         return 0;
3480                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3481                 if (err != -NFS4ERR_DELAY)
3482                         break;
3483                 nfs4_handle_exception(server, err, &exception);
3484         } while (exception.retry);
3485         return err;
3486 }
3487
3488 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3489 {
3490         struct nfs_client *clp = state->owner->so_client;
3491         unsigned char fl_flags = request->fl_flags;
3492         int status;
3493
3494         /* Is this a delegated open? */
3495         status = nfs4_set_lock_state(state, request);
3496         if (status != 0)
3497                 goto out;
3498         request->fl_flags |= FL_ACCESS;
3499         status = do_vfs_lock(request->fl_file, request);
3500         if (status < 0)
3501                 goto out;
3502         down_read(&clp->cl_sem);
3503         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3504                 struct nfs_inode *nfsi = NFS_I(state->inode);
3505                 /* Yes: cache locks! */
3506                 down_read(&nfsi->rwsem);
3507                 /* ...but avoid races with delegation recall... */
3508                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3509                         request->fl_flags = fl_flags & ~FL_SLEEP;
3510                         status = do_vfs_lock(request->fl_file, request);
3511                         up_read(&nfsi->rwsem);
3512                         goto out_unlock;
3513                 }
3514                 up_read(&nfsi->rwsem);
3515         }
3516         status = _nfs4_do_setlk(state, cmd, request, 0);
3517         if (status != 0)
3518                 goto out_unlock;
3519         /* Note: we always want to sleep here! */
3520         request->fl_flags = fl_flags | FL_SLEEP;
3521         if (do_vfs_lock(request->fl_file, request) < 0)
3522                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3523 out_unlock:
3524         up_read(&clp->cl_sem);
3525 out:
3526         request->fl_flags = fl_flags;
3527         return status;
3528 }
3529
3530 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3531 {
3532         struct nfs4_exception exception = { };
3533         int err;
3534
3535         do {
3536                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3537                                 _nfs4_proc_setlk(state, cmd, request),
3538                                 &exception);
3539         } while (exception.retry);
3540         return err;
3541 }
3542
3543 static int
3544 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3545 {
3546         struct nfs_open_context *ctx;
3547         struct nfs4_state *state;
3548         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3549         int status;
3550
3551         /* verify open state */
3552         ctx = nfs_file_open_context(filp);
3553         state = ctx->state;
3554
3555         if (request->fl_start < 0 || request->fl_end < 0)
3556                 return -EINVAL;
3557
3558         if (IS_GETLK(cmd))
3559                 return nfs4_proc_getlk(state, F_GETLK, request);
3560
3561         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3562                 return -EINVAL;
3563
3564         if (request->fl_type == F_UNLCK)
3565                 return nfs4_proc_unlck(state, cmd, request);
3566
3567         do {
3568                 status = nfs4_proc_setlk(state, cmd, request);
3569                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3570                         break;
3571                 timeout = nfs4_set_lock_task_retry(timeout);
3572                 status = -ERESTARTSYS;
3573                 if (signalled())
3574                         break;
3575         } while(status < 0);
3576         return status;
3577 }
3578
3579 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3580 {
3581         struct nfs_server *server = NFS_SERVER(state->inode);
3582         struct nfs4_exception exception = { };
3583         int err;
3584
3585         err = nfs4_set_lock_state(state, fl);
3586         if (err != 0)
3587                 goto out;
3588         do {
3589                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3590                 if (err != -NFS4ERR_DELAY)
3591                         break;
3592                 err = nfs4_handle_exception(server, err, &exception);
3593         } while (exception.retry);
3594 out:
3595         return err;
3596 }
3597
3598 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3599
3600 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3601                 size_t buflen, int flags)
3602 {
3603         struct inode *inode = dentry->d_inode;
3604
3605         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3606                 return -EOPNOTSUPP;
3607
3608         if (!S_ISREG(inode->i_mode) &&
3609             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3610                 return -EPERM;
3611
3612         return nfs4_proc_set_acl(inode, buf, buflen);
3613 }
3614
3615 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3616  * and that's what we'll do for e.g. user attributes that haven't been set.
3617  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3618  * attributes in kernel-managed attribute namespaces. */
3619 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3620                 size_t buflen)
3621 {
3622         struct inode *inode = dentry->d_inode;
3623
3624         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3625                 return -EOPNOTSUPP;
3626
3627         return nfs4_proc_get_acl(inode, buf, buflen);
3628 }
3629
3630 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3631 {
3632         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3633
3634         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3635                 return 0;
3636         if (buf && buflen < len)
3637                 return -ERANGE;
3638         if (buf)
3639                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3640         return len;
3641 }
3642
3643 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3644                 struct nfs4_fs_locations *fs_locations, struct page *page)
3645 {
3646         struct nfs_server *server = NFS_SERVER(dir);
3647         u32 bitmask[2] = {
3648                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3649                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3650         };
3651         struct nfs4_fs_locations_arg args = {
3652                 .dir_fh = NFS_FH(dir),
3653                 .name = name,
3654                 .page = page,
3655                 .bitmask = bitmask,
3656         };
3657         struct rpc_message msg = {
3658                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3659                 .rpc_argp = &args,
3660                 .rpc_resp = fs_locations,
3661         };
3662         int status;
3663
3664         dprintk("%s: start\n", __FUNCTION__);
3665         nfs_fattr_init(&fs_locations->fattr);
3666         fs_locations->server = server;
3667         fs_locations->nlocations = 0;
3668         status = rpc_call_sync(server->client, &msg, 0);
3669         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3670         return status;
3671 }
3672
3673 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3674         .recover_open   = nfs4_open_reclaim,
3675         .recover_lock   = nfs4_lock_reclaim,
3676 };
3677
3678 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3679         .recover_open   = nfs4_open_expired,
3680         .recover_lock   = nfs4_lock_expired,
3681 };
3682
3683 static const struct inode_operations nfs4_file_inode_operations = {
3684         .permission     = nfs_permission,
3685         .getattr        = nfs_getattr,
3686         .setattr        = nfs_setattr,
3687         .getxattr       = nfs4_getxattr,
3688         .setxattr       = nfs4_setxattr,
3689         .listxattr      = nfs4_listxattr,
3690 };
3691
3692 const struct nfs_rpc_ops nfs_v4_clientops = {
3693         .version        = 4,                    /* protocol version */
3694         .dentry_ops     = &nfs4_dentry_operations,
3695         .dir_inode_ops  = &nfs4_dir_inode_operations,
3696         .file_inode_ops = &nfs4_file_inode_operations,
3697         .getroot        = nfs4_proc_get_root,
3698         .getattr        = nfs4_proc_getattr,
3699         .setattr        = nfs4_proc_setattr,
3700         .lookupfh       = nfs4_proc_lookupfh,
3701         .lookup         = nfs4_proc_lookup,
3702         .access         = nfs4_proc_access,
3703         .readlink       = nfs4_proc_readlink,
3704         .create         = nfs4_proc_create,
3705         .remove         = nfs4_proc_remove,
3706         .unlink_setup   = nfs4_proc_unlink_setup,
3707         .unlink_done    = nfs4_proc_unlink_done,
3708         .rename         = nfs4_proc_rename,
3709         .link           = nfs4_proc_link,
3710         .symlink        = nfs4_proc_symlink,
3711         .mkdir          = nfs4_proc_mkdir,
3712         .rmdir          = nfs4_proc_remove,
3713         .readdir        = nfs4_proc_readdir,
3714         .mknod          = nfs4_proc_mknod,
3715         .statfs         = nfs4_proc_statfs,
3716         .fsinfo         = nfs4_proc_fsinfo,
3717         .pathconf       = nfs4_proc_pathconf,
3718         .set_capabilities = nfs4_server_capabilities,
3719         .decode_dirent  = nfs4_decode_dirent,
3720         .read_setup     = nfs4_proc_read_setup,
3721         .read_done      = nfs4_read_done,
3722         .write_setup    = nfs4_proc_write_setup,
3723         .write_done     = nfs4_write_done,
3724         .commit_setup   = nfs4_proc_commit_setup,
3725         .commit_done    = nfs4_commit_done,
3726         .file_open      = nfs_open,
3727         .file_release   = nfs_release,
3728         .lock           = nfs4_proc_lock,
3729         .clear_acl_cache = nfs4_zap_acl_attr,
3730 };
3731
3732 /*
3733  * Local variables:
3734  *  c-basic-offset: 8
3735  * End:
3736  */