fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 212         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 213                 nfsi->cache_change_attribute = jiffies;
 214         nfsi->change_attr = cinfo->after;
 215         spin_unlock(&dir->i_lock);
 216 }
 217
 218 struct nfs4_opendata {
 219         struct kref kref;
 220         struct nfs_openargs o_arg;
 221         struct nfs_openres o_res;
 222         struct nfs_open_confirmargs c_arg;
 223         struct nfs_open_confirmres c_res;
 224         struct nfs_fattr f_attr;
 225         struct nfs_fattr dir_attr;
 226         struct path path;
 227         struct dentry *dir;
 228         struct nfs4_state_owner *owner;
 229         struct nfs4_state *state;
 230         struct iattr attrs;
 231         unsigned long timestamp;
 232         unsigned int rpc_done : 1;
 233         int rpc_status;
 234         int cancelled;
 235 };
 236
 237
 238 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 239 {
 240         p->o_res.f_attr = &p->f_attr;
 241         p->o_res.dir_attr = &p->dir_attr;
 242         p->o_res.server = p->o_arg.server;
 243         nfs_fattr_init(&p->f_attr);
 244         nfs_fattr_init(&p->dir_attr);
 245 }
 246
 247 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 248                 struct nfs4_state_owner *sp, int flags,
 249                 const struct iattr *attrs)
 250 {
 251         struct dentry *parent = dget_parent(path->dentry);
 252         struct inode *dir = parent->d_inode;
 253         struct nfs_server *server = NFS_SERVER(dir);
 254         struct nfs4_opendata *p;
 255
 256         p = kzalloc(sizeof(*p), GFP_KERNEL);
 257         if (p == NULL)
 258                 goto err;
 259         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 260         if (p->o_arg.seqid == NULL)
 261                 goto err_free;
 262         p->path.mnt = mntget(path->mnt);
 263         p->path.dentry = dget(path->dentry);
 264         p->dir = parent;
 265         p->owner = sp;
 266         atomic_inc(&sp->so_count);
 267         p->o_arg.fh = NFS_FH(dir);
 268         p->o_arg.open_flags = flags,
 269         p->o_arg.clientid = server->nfs_client->cl_clientid;
 270         p->o_arg.id = sp->so_owner_id.id;
 271         p->o_arg.name = &p->path.dentry->d_name;
 272         p->o_arg.server = server;
 273         p->o_arg.bitmask = server->attr_bitmask;
 274         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 275         if (flags & O_EXCL) {
 276                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 277                 s[0] = jiffies;
 278                 s[1] = current->pid;
 279         } else if (flags & O_CREAT) {
 280                 p->o_arg.u.attrs = &p->attrs;
 281                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 282         }
 283         p->c_arg.fh = &p->o_res.fh;
 284         p->c_arg.stateid = &p->o_res.stateid;
 285         p->c_arg.seqid = p->o_arg.seqid;
 286         nfs4_init_opendata_res(p);
 287         kref_init(&p->kref);
 288         return p;
 289 err_free:
 290         kfree(p);
 291 err:
 292         dput(parent);
 293         return NULL;
 294 }
 295
 296 static void nfs4_opendata_free(struct kref *kref)
 297 {
 298         struct nfs4_opendata *p = container_of(kref,
 299                         struct nfs4_opendata, kref);
 300
 301         nfs_free_seqid(p->o_arg.seqid);
 302         if (p->state != NULL)
 303                 nfs4_put_open_state(p->state);
 304         nfs4_put_state_owner(p->owner);
 305         dput(p->dir);
 306         dput(p->path.dentry);
 307         mntput(p->path.mnt);
 308         kfree(p);
 309 }
 310
 311 static void nfs4_opendata_put(struct nfs4_opendata *p)
 312 {
 313         if (p != NULL)
 314                 kref_put(&p->kref, nfs4_opendata_free);
 315 }
 316
 317 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 318 {
 319         sigset_t oldset;
 320         int ret;
 321
 322         rpc_clnt_sigmask(task->tk_client, &oldset);
 323         ret = rpc_wait_for_completion_task(task);
 324         rpc_clnt_sigunmask(task->tk_client, &oldset);
 325         return ret;
 326 }
 327
 328 static int can_open_cached(struct nfs4_state *state, int mode)
 329 {
 330         int ret = 0;
 331         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 332                 case FMODE_READ:
 333                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 337                         break;
 338                 case FMODE_READ|FMODE_WRITE:
 339                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 340         }
 341         return ret;
 342 }
 343
 344 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 345 {
 346         if ((delegation->type & open_flags) != open_flags)
 347                 return 0;
 348         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 349                 return 0;
 350         return 1;
 351 }
 352
 353 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 354 {
 355         switch (open_flags) {
 356                 case FMODE_WRITE:
 357                         state->n_wronly++;
 358                         break;
 359                 case FMODE_READ:
 360                         state->n_rdonly++;
 361                         break;
 362                 case FMODE_READ|FMODE_WRITE:
 363                         state->n_rdwr++;
 364         }
 365         nfs4_state_set_mode_locked(state, state->state | open_flags);
 366 }
 367
 368 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 369 {
 370         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 371                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 372         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 373         switch (open_flags) {
 374                 case FMODE_READ:
 375                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 376                         break;
 377                 case FMODE_WRITE:
 378                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 379                         break;
 380                 case FMODE_READ|FMODE_WRITE:
 381                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 382         }
 383 }
 384
 385 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 386 {
 387         write_seqlock(&state->seqlock);
 388         nfs_set_open_stateid_locked(state, stateid, open_flags);
 389         write_sequnlock(&state->seqlock);
 390 }
 391
 392 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 393 {
 394         open_flags &= (FMODE_READ|FMODE_WRITE);
 395         /*
 396          * Protect the call to nfs4_state_set_mode_locked and
 397          * serialise the stateid update
 398          */
 399         write_seqlock(&state->seqlock);
 400         if (deleg_stateid != NULL) {
 401                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 402                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 403         }
 404         if (open_stateid != NULL)
 405                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 406         write_sequnlock(&state->seqlock);
 407         spin_lock(&state->owner->so_lock);
 408         update_open_stateflags(state, open_flags);
 409         spin_unlock(&state->owner->so_lock);
 410 }
 411
 412 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 413 {
 414         struct nfs_delegation *delegation;
 415
 416         rcu_read_lock();
 417         delegation = rcu_dereference(NFS_I(inode)->delegation);
 418         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 419                 rcu_read_unlock();
 420                 return;
 421         }
 422         rcu_read_unlock();
 423         nfs_inode_return_delegation(inode);
 424 }
 425
 426 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 427 {
 428         struct nfs4_state *state = opendata->state;
 429         struct nfs_inode *nfsi = NFS_I(state->inode);
 430         struct nfs_delegation *delegation;
 431         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 432         nfs4_stateid stateid;
 433         int ret = -EAGAIN;
 434
 435         rcu_read_lock();
 436         delegation = rcu_dereference(nfsi->delegation);
 437         for (;;) {
 438                 if (can_open_cached(state, open_mode)) {
 439                         spin_lock(&state->owner->so_lock);
 440                         if (can_open_cached(state, open_mode)) {
 441                                 update_open_stateflags(state, open_mode);
 442                                 spin_unlock(&state->owner->so_lock);
 443                                 rcu_read_unlock();
 444                                 goto out_return_state;
 445                         }
 446                         spin_unlock(&state->owner->so_lock);
 447                 }
 448                 if (delegation == NULL)
 449                         break;
 450                 if (!can_open_delegated(delegation, open_mode))
 451                         break;
 452                 /* Save the delegation */
 453                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 454                 rcu_read_unlock();
 455                 lock_kernel();
 456                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 457                 unlock_kernel();
 458                 if (ret != 0)
 459                         goto out;
 460                 ret = -EAGAIN;
 461                 rcu_read_lock();
 462                 delegation = rcu_dereference(nfsi->delegation);
 463                 /* If no delegation, try a cached open */
 464                 if (delegation == NULL)
 465                         continue;
 466                 /* Is the delegation still valid? */
 467                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 468                         continue;
 469                 rcu_read_unlock();
 470                 update_open_stateid(state, NULL, &stateid, open_mode);
 471                 goto out_return_state;
 472         }
 473         rcu_read_unlock();
 474 out:
 475         return ERR_PTR(ret);
 476 out_return_state:
 477         atomic_inc(&state->count);
 478         return state;
 479 }
 480
 481 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 482 {
 483         struct inode *inode;
 484         struct nfs4_state *state = NULL;
 485         struct nfs_delegation *delegation;
 486         nfs4_stateid *deleg_stateid = NULL;
 487         int ret;
 488
 489         if (!data->rpc_done) {
 490                 state = nfs4_try_open_cached(data);
 491                 goto out;
 492         }
 493
 494         ret = -EAGAIN;
 495         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 496                 goto err;
 497         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 498         ret = PTR_ERR(inode);
 499         if (IS_ERR(inode))
 500                 goto err;
 501         ret = -ENOMEM;
 502         state = nfs4_get_open_state(inode, data->owner);
 503         if (state == NULL)
 504                 goto err_put_inode;
 505         if (data->o_res.delegation_type != 0) {
 506                 int delegation_flags = 0;
 507
 508                 rcu_read_lock();
 509                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 510                 if (delegation)
 511                         delegation_flags = delegation->flags;
 512                 rcu_read_unlock();
 513                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 514                         nfs_inode_set_delegation(state->inode,
 515                                         data->owner->so_cred,
 516                                         &data->o_res);
 517                 else
 518                         nfs_inode_reclaim_delegation(state->inode,
 519                                         data->owner->so_cred,
 520                                         &data->o_res);
 521         }
 522         rcu_read_lock();
 523         delegation = rcu_dereference(NFS_I(inode)->delegation);
 524         if (delegation != NULL)
 525                 deleg_stateid = &delegation->stateid;
 526         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 527         rcu_read_unlock();
 528         iput(inode);
 529 out:
 530         return state;
 531 err_put_inode:
 532         iput(inode);
 533 err:
 534         return ERR_PTR(ret);
 535 }
 536
 537 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 538 {
 539         struct nfs_inode *nfsi = NFS_I(state->inode);
 540         struct nfs_open_context *ctx;
 541
 542         spin_lock(&state->inode->i_lock);
 543         list_for_each_entry(ctx, &nfsi->open_files, list) {
 544                 if (ctx->state != state)
 545                         continue;
 546                 get_nfs_open_context(ctx);
 547                 spin_unlock(&state->inode->i_lock);
 548                 return ctx;
 549         }
 550         spin_unlock(&state->inode->i_lock);
 551         return ERR_PTR(-ENOENT);
 552 }
 553
 554 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 555 {
 556         struct nfs4_opendata *opendata;
 557
 558         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 559         if (opendata == NULL)
 560                 return ERR_PTR(-ENOMEM);
 561         opendata->state = state;
 562         atomic_inc(&state->count);
 563         return opendata;
 564 }
 565
 566 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 567 {
 568         struct nfs4_state *newstate;
 569         int ret;
 570
 571         opendata->o_arg.open_flags = openflags;
 572         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 573         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 574         nfs4_init_opendata_res(opendata);
 575         ret = _nfs4_proc_open(opendata);
 576         if (ret != 0)
 577                 return ret;
 578         newstate = nfs4_opendata_to_nfs4_state(opendata);
 579         if (IS_ERR(newstate))
 580                 return PTR_ERR(newstate);
 581         nfs4_close_state(&opendata->path, newstate, openflags);
 582         *res = newstate;
 583         return 0;
 584 }
 585
 586 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 587 {
 588         struct nfs4_state *newstate;
 589         int ret;
 590
 591         /* memory barrier prior to reading state->n_* */
 592         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 593         smp_rmb();
 594         if (state->n_rdwr != 0) {
 595                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 596                 if (ret != 0)
 597                         return ret;
 598                 if (newstate != state)
 599                         return -ESTALE;
 600         }
 601         if (state->n_wronly != 0) {
 602                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 603                 if (ret != 0)
 604                         return ret;
 605                 if (newstate != state)
 606                         return -ESTALE;
 607         }
 608         if (state->n_rdonly != 0) {
 609                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 610                 if (ret != 0)
 611                         return ret;
 612                 if (newstate != state)
 613                         return -ESTALE;
 614         }
 615         /*
 616          * We may have performed cached opens for all three recoveries.
 617          * Check if we need to update the current stateid.
 618          */
 619         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 620             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 621                 write_seqlock(&state->seqlock);
 622                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 623                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 624                 write_sequnlock(&state->seqlock);
 625         }
 626         return 0;
 627 }
 628
 629 /*
 630  * OPEN_RECLAIM:
 631  *      reclaim state on the server after a reboot.
 632  */
 633 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 634 {
 635         struct nfs_delegation *delegation;
 636         struct nfs4_opendata *opendata;
 637         int delegation_type = 0;
 638         int status;
 639
 640         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 641         if (IS_ERR(opendata))
 642                 return PTR_ERR(opendata);
 643         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 644         opendata->o_arg.fh = NFS_FH(state->inode);
 645         rcu_read_lock();
 646         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 647         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 648                 delegation_type = delegation->type;
 649         rcu_read_unlock();
 650         opendata->o_arg.u.delegation_type = delegation_type;
 651         status = nfs4_open_recover(opendata, state);
 652         nfs4_opendata_put(opendata);
 653         return status;
 654 }
 655
 656 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 657 {
 658         struct nfs_server *server = NFS_SERVER(state->inode);
 659         struct nfs4_exception exception = { };
 660         int err;
 661         do {
 662                 err = _nfs4_do_open_reclaim(ctx, state);
 663                 if (err != -NFS4ERR_DELAY)
 664                         break;
 665                 nfs4_handle_exception(server, err, &exception);
 666         } while (exception.retry);
 667         return err;
 668 }
 669
 670 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 671 {
 672         struct nfs_open_context *ctx;
 673         int ret;
 674
 675         ctx = nfs4_state_find_open_context(state);
 676         if (IS_ERR(ctx))
 677                 return PTR_ERR(ctx);
 678         ret = nfs4_do_open_reclaim(ctx, state);
 679         put_nfs_open_context(ctx);
 680         return ret;
 681 }
 682
 683 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 684 {
 685         struct nfs4_opendata *opendata;
 686         int ret;
 687
 688         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 689         if (IS_ERR(opendata))
 690                 return PTR_ERR(opendata);
 691         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 692         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 693                         sizeof(opendata->o_arg.u.delegation.data));
 694         ret = nfs4_open_recover(opendata, state);
 695         nfs4_opendata_put(opendata);
 696         return ret;
 697 }
 698
 699 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 700 {
 701         struct nfs4_exception exception = { };
 702         struct nfs_server *server = NFS_SERVER(state->inode);
 703         int err;
 704         do {
 705                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 706                 switch (err) {
 707                         case 0:
 708                                 return err;
 709                         case -NFS4ERR_STALE_CLIENTID:
 710                         case -NFS4ERR_STALE_STATEID:
 711                         case -NFS4ERR_EXPIRED:
 712                                 /* Don't recall a delegation if it was lost */
 713                                 nfs4_schedule_state_recovery(server->nfs_client);
 714                                 return err;
 715                 }
 716                 err = nfs4_handle_exception(server, err, &exception);
 717         } while (exception.retry);
 718         return err;
 719 }
 720
 721 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 722 {
 723         struct nfs4_opendata *data = calldata;
 724         struct  rpc_message msg = {
 725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 726                 .rpc_argp = &data->c_arg,
 727                 .rpc_resp = &data->c_res,
 728                 .rpc_cred = data->owner->so_cred,
 729         };
 730         data->timestamp = jiffies;
 731         rpc_call_setup(task, &msg, 0);
 732 }
 733
 734 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 735 {
 736         struct nfs4_opendata *data = calldata;
 737
 738         data->rpc_status = task->tk_status;
 739         if (RPC_ASSASSINATED(task))
 740                 return;
 741         if (data->rpc_status == 0) {
 742                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 743                                 sizeof(data->o_res.stateid.data));
 744                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 745                 renew_lease(data->o_res.server, data->timestamp);
 746                 data->rpc_done = 1;
 747         }
 748         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 749 }
 750
 751 static void nfs4_open_confirm_release(void *calldata)
 752 {
 753         struct nfs4_opendata *data = calldata;
 754         struct nfs4_state *state = NULL;
 755
 756         /* If this request hasn't been cancelled, do nothing */
 757         if (data->cancelled == 0)
 758                 goto out_free;
 759         /* In case of error, no cleanup! */
 760         if (!data->rpc_done)
 761                 goto out_free;
 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         state = nfs4_opendata_to_nfs4_state(data);
 889         if (!IS_ERR(state))
 890                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 891 out_free:
 892         nfs4_opendata_put(data);
 893 }
 894
 895 static const struct rpc_call_ops nfs4_open_ops = {
 896         .rpc_call_prepare = nfs4_open_prepare,
 897         .rpc_call_done = nfs4_open_done,
 898         .rpc_release = nfs4_open_release,
 899 };
 900
 901 /*
 902  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 903  */
 904 static int _nfs4_proc_open(struct nfs4_opendata *data)
 905 {
 906         struct inode *dir = data->dir->d_inode;
 907         struct nfs_server *server = NFS_SERVER(dir);
 908         struct nfs_openargs *o_arg = &data->o_arg;
 909         struct nfs_openres *o_res = &data->o_res;
 910         struct rpc_task *task;
 911         int status;
 912
 913         kref_get(&data->kref);
 914         data->rpc_done = 0;
 915         data->rpc_status = 0;
 916         data->cancelled = 0;
 917         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 918         if (IS_ERR(task))
 919                 return PTR_ERR(task);
 920         status = nfs4_wait_for_completion_rpc_task(task);
 921         if (status != 0) {
 922                 data->cancelled = 1;
 923                 smp_wmb();
 924         } else
 925                 status = data->rpc_status;
 926         rpc_put_task(task);
 927         if (status != 0 || !data->rpc_done)
 928                 return status;
 929
 930         if (o_res->fh.size == 0)
 931                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 932
 933         if (o_arg->open_flags & O_CREAT) {
 934                 update_changeattr(dir, &o_res->cinfo);
 935                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 936         } else
 937                 nfs_refresh_inode(dir, o_res->dir_attr);
 938         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 939                 status = _nfs4_proc_open_confirm(data);
 940                 if (status != 0)
 941                         return status;
 942         }
 943         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 944                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 945         return 0;
 946 }
 947
 948 static int nfs4_recover_expired_lease(struct nfs_server *server)
 949 {
 950         struct nfs_client *clp = server->nfs_client;
 951         int ret;
 952
 953         for (;;) {
 954                 ret = nfs4_wait_clnt_recover(server->client, clp);
 955                 if (ret != 0)
 956                         return ret;
 957                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 958                         break;
 959                 nfs4_schedule_state_recovery(clp);
 960         }
 961         return 0;
 962 }
 963
 964 /*
 965  * OPEN_EXPIRED:
 966  *      reclaim state on the server after a network partition.
 967  *      Assumes caller holds the appropriate lock
 968  */
 969 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 970 {
 971         struct nfs4_opendata *opendata;
 972         int ret;
 973
 974         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 975         if (IS_ERR(opendata))
 976                 return PTR_ERR(opendata);
 977         ret = nfs4_open_recover(opendata, state);
 978         if (ret == -ESTALE) {
 979                 /* Invalidate the state owner so we don't ever use it again */
 980                 nfs4_drop_state_owner(state->owner);
 981                 d_drop(ctx->path.dentry);
 982         }
 983         nfs4_opendata_put(opendata);
 984         return ret;
 985 }
 986
 987 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 988 {
 989         struct nfs_server *server = NFS_SERVER(state->inode);
 990         struct nfs4_exception exception = { };
 991         int err;
 992
 993         do {
 994                 err = _nfs4_open_expired(ctx, state);
 995                 if (err == -NFS4ERR_DELAY)
 996                         nfs4_handle_exception(server, err, &exception);
 997         } while (exception.retry);
 998         return err;
 999 }
1000
1001 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1002 {
1003         struct nfs_open_context *ctx;
1004         int ret;
1005
1006         ctx = nfs4_state_find_open_context(state);
1007         if (IS_ERR(ctx))
1008                 return PTR_ERR(ctx);
1009         ret = nfs4_do_open_expired(ctx, state);
1010         put_nfs_open_context(ctx);
1011         return ret;
1012 }
1013
1014 /*
1015  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1016  * fields corresponding to attributes that were used to store the verifier.
1017  * Make sure we clobber those fields in the later setattr call
1018  */
1019 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1020 {
1021         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1022             !(sattr->ia_valid & ATTR_ATIME_SET))
1023                 sattr->ia_valid |= ATTR_ATIME;
1024
1025         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1026             !(sattr->ia_valid & ATTR_MTIME_SET))
1027                 sattr->ia_valid |= ATTR_MTIME;
1028 }
1029
1030 /*
1031  * Returns a referenced nfs4_state
1032  */
1033 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1034 {
1035         struct nfs4_state_owner  *sp;
1036         struct nfs4_state     *state = NULL;
1037         struct nfs_server       *server = NFS_SERVER(dir);
1038         struct nfs_client *clp = server->nfs_client;
1039         struct nfs4_opendata *opendata;
1040         int status;
1041
1042         /* Protect against reboot recovery conflicts */
1043         status = -ENOMEM;
1044         if (!(sp = nfs4_get_state_owner(server, cred))) {
1045                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1046                 goto out_err;
1047         }
1048         status = nfs4_recover_expired_lease(server);
1049         if (status != 0)
1050                 goto err_put_state_owner;
1051         if (path->dentry->d_inode != NULL)
1052                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1053         down_read(&clp->cl_sem);
1054         status = -ENOMEM;
1055         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1056         if (opendata == NULL)
1057                 goto err_release_rwsem;
1058
1059         if (path->dentry->d_inode != NULL)
1060                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1061
1062         status = _nfs4_proc_open(opendata);
1063         if (status != 0)
1064                 goto err_opendata_put;
1065
1066         if (opendata->o_arg.open_flags & O_EXCL)
1067                 nfs4_exclusive_attrset(opendata, sattr);
1068
1069         state = nfs4_opendata_to_nfs4_state(opendata);
1070         status = PTR_ERR(state);
1071         if (IS_ERR(state))
1072                 goto err_opendata_put;
1073         nfs4_opendata_put(opendata);
1074         nfs4_put_state_owner(sp);
1075         up_read(&clp->cl_sem);
1076         *res = state;
1077         return 0;
1078 err_opendata_put:
1079         nfs4_opendata_put(opendata);
1080 err_release_rwsem:
1081         up_read(&clp->cl_sem);
1082 err_put_state_owner:
1083         nfs4_put_state_owner(sp);
1084 out_err:
1085         *res = NULL;
1086         return status;
1087 }
1088
1089
1090 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1091 {
1092         struct nfs4_exception exception = { };
1093         struct nfs4_state *res;
1094         int status;
1095
1096         do {
1097                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1098                 if (status == 0)
1099                         break;
1100                 /* NOTE: BAD_SEQID means the server and client disagree about the
1101                  * book-keeping w.r.t. state-changing operations
1102                  * (OPEN/CLOSE/LOCK/LOCKU...)
1103                  * It is actually a sign of a bug on the client or on the server.
1104                  *
1105                  * If we receive a BAD_SEQID error in the particular case of
1106                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1107                  * have unhashed the old state_owner for us, and that we can
1108                  * therefore safely retry using a new one. We should still warn
1109                  * the user though...
1110                  */
1111                 if (status == -NFS4ERR_BAD_SEQID) {
1112                         printk(KERN_WARNING "NFS: v4 server %s "
1113                                         " returned a bad sequence-id error!\n",
1114                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1115                         exception.retry = 1;
1116                         continue;
1117                 }
1118                 /*
1119                  * BAD_STATEID on OPEN means that the server cancelled our
1120                  * state before it received the OPEN_CONFIRM.
1121                  * Recover by retrying the request as per the discussion
1122                  * on Page 181 of RFC3530.
1123                  */
1124                 if (status == -NFS4ERR_BAD_STATEID) {
1125                         exception.retry = 1;
1126                         continue;
1127                 }
1128                 if (status == -EAGAIN) {
1129                         /* We must have found a delegation */
1130                         exception.retry = 1;
1131                         continue;
1132                 }
1133                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1134                                         status, &exception));
1135         } while (exception.retry);
1136         return res;
1137 }
1138
1139 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1140                 struct iattr *sattr, struct nfs4_state *state)
1141 {
1142         struct nfs_server *server = NFS_SERVER(inode);
1143         struct nfs_setattrargs  arg = {
1144                 .fh             = NFS_FH(inode),
1145                 .iap            = sattr,
1146                 .server         = server,
1147                 .bitmask = server->attr_bitmask,
1148         };
1149         struct nfs_setattrres  res = {
1150                 .fattr          = fattr,
1151                 .server         = server,
1152         };
1153         struct rpc_message msg = {
1154                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1155                 .rpc_argp       = &arg,
1156                 .rpc_resp       = &res,
1157         };
1158         unsigned long timestamp = jiffies;
1159         int status;
1160
1161         nfs_fattr_init(fattr);
1162
1163         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1164                 /* Use that stateid */
1165         } else if (state != NULL) {
1166                 msg.rpc_cred = state->owner->so_cred;
1167                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1168         } else
1169                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1170
1171         status = rpc_call_sync(server->client, &msg, 0);
1172         if (status == 0 && state != NULL)
1173                 renew_lease(server, timestamp);
1174         return status;
1175 }
1176
1177 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1178                 struct iattr *sattr, struct nfs4_state *state)
1179 {
1180         struct nfs_server *server = NFS_SERVER(inode);
1181         struct nfs4_exception exception = { };
1182         int err;
1183         do {
1184                 err = nfs4_handle_exception(server,
1185                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1186                                 &exception);
1187         } while (exception.retry);
1188         return err;
1189 }
1190
1191 struct nfs4_closedata {
1192         struct path path;
1193         struct inode *inode;
1194         struct nfs4_state *state;
1195         struct nfs_closeargs arg;
1196         struct nfs_closeres res;
1197         struct nfs_fattr fattr;
1198         unsigned long timestamp;
1199 };
1200
1201 static void nfs4_free_closedata(void *data)
1202 {
1203         struct nfs4_closedata *calldata = data;
1204         struct nfs4_state_owner *sp = calldata->state->owner;
1205
1206         nfs4_put_open_state(calldata->state);
1207         nfs_free_seqid(calldata->arg.seqid);
1208         nfs4_put_state_owner(sp);
1209         dput(calldata->path.dentry);
1210         mntput(calldata->path.mnt);
1211         kfree(calldata);
1212 }
1213
1214 static void nfs4_close_done(struct rpc_task *task, void *data)
1215 {
1216         struct nfs4_closedata *calldata = data;
1217         struct nfs4_state *state = calldata->state;
1218         struct nfs_server *server = NFS_SERVER(calldata->inode);
1219
1220         if (RPC_ASSASSINATED(task))
1221                 return;
1222         /* hmm. we are done with the inode, and in the process of freeing
1223          * the state_owner. we keep this around to process errors
1224          */
1225         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1226         switch (task->tk_status) {
1227                 case 0:
1228                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1229                         renew_lease(server, calldata->timestamp);
1230                         break;
1231                 case -NFS4ERR_STALE_STATEID:
1232                 case -NFS4ERR_EXPIRED:
1233                         break;
1234                 default:
1235                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1236                                 rpc_restart_call(task);
1237                                 return;
1238                         }
1239         }
1240         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1241 }
1242
1243 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1244 {
1245         struct nfs4_closedata *calldata = data;
1246         struct nfs4_state *state = calldata->state;
1247         struct rpc_message msg = {
1248                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1249                 .rpc_argp = &calldata->arg,
1250                 .rpc_resp = &calldata->res,
1251                 .rpc_cred = state->owner->so_cred,
1252         };
1253         int clear_rd, clear_wr, clear_rdwr;
1254
1255         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1256                 return;
1257
1258         clear_rd = clear_wr = clear_rdwr = 0;
1259         spin_lock(&state->owner->so_lock);
1260         /* Calculate the change in open mode */
1261         if (state->n_rdwr == 0) {
1262                 if (state->n_rdonly == 0) {
1263                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1264                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1265                 }
1266                 if (state->n_wronly == 0) {
1267                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1268                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1269                 }
1270         }
1271         spin_unlock(&state->owner->so_lock);
1272         if (!clear_rd && !clear_wr && !clear_rdwr) {
1273                 /* Note: exit _without_ calling nfs4_close_done */
1274                 task->tk_action = NULL;
1275                 return;
1276         }
1277         nfs_fattr_init(calldata->res.fattr);
1278         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1279                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1280                 calldata->arg.open_flags = FMODE_READ;
1281         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1282                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1283                 calldata->arg.open_flags = FMODE_WRITE;
1284         }
1285         calldata->timestamp = jiffies;
1286         rpc_call_setup(task, &msg, 0);
1287 }
1288
1289 static const struct rpc_call_ops nfs4_close_ops = {
1290         .rpc_call_prepare = nfs4_close_prepare,
1291         .rpc_call_done = nfs4_close_done,
1292         .rpc_release = nfs4_free_closedata,
1293 };
1294
1295 /*
1296  * It is possible for data to be read/written from a mem-mapped file
1297  * after the sys_close call (which hits the vfs layer as a flush).
1298  * This means that we can't safely call nfsv4 close on a file until
1299  * the inode is cleared. This in turn means that we are not good
1300  * NFSv4 citizens - we do not indicate to the server to update the file's
1301  * share state even when we are done with one of the three share
1302  * stateid's in the inode.
1303  *
1304  * NOTE: Caller must be holding the sp->so_owner semaphore!
1305  */
1306 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1307 {
1308         struct nfs_server *server = NFS_SERVER(state->inode);
1309         struct nfs4_closedata *calldata;
1310         struct nfs4_state_owner *sp = state->owner;
1311         struct rpc_task *task;
1312         int status = -ENOMEM;
1313
1314         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1315         if (calldata == NULL)
1316                 goto out;
1317         calldata->inode = state->inode;
1318         calldata->state = state;
1319         calldata->arg.fh = NFS_FH(state->inode);
1320         calldata->arg.stateid = &state->open_stateid;
1321         /* Serialization for the sequence id */
1322         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1323         if (calldata->arg.seqid == NULL)
1324                 goto out_free_calldata;
1325         calldata->arg.bitmask = server->attr_bitmask;
1326         calldata->res.fattr = &calldata->fattr;
1327         calldata->res.server = server;
1328         calldata->path.mnt = mntget(path->mnt);
1329         calldata->path.dentry = dget(path->dentry);
1330
1331         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1332         if (IS_ERR(task))
1333                 return PTR_ERR(task);
1334         status = 0;
1335         if (wait)
1336                 status = rpc_wait_for_completion_task(task);
1337         rpc_put_task(task);
1338         return status;
1339 out_free_calldata:
1340         kfree(calldata);
1341 out:
1342         nfs4_put_open_state(state);
1343         nfs4_put_state_owner(sp);
1344         return status;
1345 }
1346
1347 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1348 {
1349         struct file *filp;
1350         int ret;
1351
1352         /* If the open_intent is for execute, we have an extra check to make */
1353         if (nd->intent.open.flags & FMODE_EXEC) {
1354                 ret = nfs_may_open(state->inode,
1355                                 state->owner->so_cred,
1356                                 nd->intent.open.flags);
1357                 if (ret < 0)
1358                         goto out_close;
1359         }
1360         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1361         if (!IS_ERR(filp)) {
1362                 struct nfs_open_context *ctx;
1363                 ctx = nfs_file_open_context(filp);
1364                 ctx->state = state;
1365                 return 0;
1366         }
1367         ret = PTR_ERR(filp);
1368 out_close:
1369         nfs4_close_sync(path, state, nd->intent.open.flags);
1370         return ret;
1371 }
1372
1373 struct dentry *
1374 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1375 {
1376         struct dentry *parent;
1377         struct path path = {
1378                 .mnt = nd->mnt,
1379                 .dentry = dentry,
1380         };
1381         struct iattr attr;
1382         struct rpc_cred *cred;
1383         struct nfs4_state *state;
1384         struct dentry *res;
1385
1386         if (nd->flags & LOOKUP_CREATE) {
1387                 attr.ia_mode = nd->intent.open.create_mode;
1388                 attr.ia_valid = ATTR_MODE;
1389                 if (!IS_POSIXACL(dir))
1390                         attr.ia_mode &= ~current->fs->umask;
1391         } else {
1392                 attr.ia_valid = 0;
1393                 BUG_ON(nd->intent.open.flags & O_CREAT);
1394         }
1395
1396         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1397         if (IS_ERR(cred))
1398                 return (struct dentry *)cred;
1399         parent = dentry->d_parent;
1400         /* Protect against concurrent sillydeletes */
1401         nfs_block_sillyrename(parent);
1402         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1403         put_rpccred(cred);
1404         if (IS_ERR(state)) {
1405                 if (PTR_ERR(state) == -ENOENT) {
1406                         d_add(dentry, NULL);
1407                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1408                 }
1409                 nfs_unblock_sillyrename(parent);
1410                 return (struct dentry *)state;
1411         }
1412         res = d_add_unique(dentry, igrab(state->inode));
1413         if (res != NULL)
1414                 path.dentry = res;
1415         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1416         nfs_unblock_sillyrename(parent);
1417         nfs4_intent_set_file(nd, &path, state);
1418         return res;
1419 }
1420
1421 int
1422 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1423 {
1424         struct path path = {
1425                 .mnt = nd->mnt,
1426                 .dentry = dentry,
1427         };
1428         struct rpc_cred *cred;
1429         struct nfs4_state *state;
1430
1431         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1432         if (IS_ERR(cred))
1433                 return PTR_ERR(cred);
1434         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1435         put_rpccred(cred);
1436         if (IS_ERR(state)) {
1437                 switch (PTR_ERR(state)) {
1438                         case -EPERM:
1439                         case -EACCES:
1440                         case -EDQUOT:
1441                         case -ENOSPC:
1442                         case -EROFS:
1443                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1444                                 return 1;
1445                         default:
1446                                 goto out_drop;
1447                 }
1448         }
1449         if (state->inode == dentry->d_inode) {
1450                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1451                 nfs4_intent_set_file(nd, &path, state);
1452                 return 1;
1453         }
1454         nfs4_close_sync(&path, state, openflags);
1455 out_drop:
1456         d_drop(dentry);
1457         return 0;
1458 }
1459
1460
1461 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1462 {
1463         struct nfs4_server_caps_res res = {};
1464         struct rpc_message msg = {
1465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1466                 .rpc_argp = fhandle,
1467                 .rpc_resp = &res,
1468         };
1469         int status;
1470
1471         status = rpc_call_sync(server->client, &msg, 0);
1472         if (status == 0) {
1473                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1474                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1475                         server->caps |= NFS_CAP_ACLS;
1476                 if (res.has_links != 0)
1477                         server->caps |= NFS_CAP_HARDLINKS;
1478                 if (res.has_symlinks != 0)
1479                         server->caps |= NFS_CAP_SYMLINKS;
1480                 server->acl_bitmask = res.acl_bitmask;
1481         }
1482         return status;
1483 }
1484
1485 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1486 {
1487         struct nfs4_exception exception = { };
1488         int err;
1489         do {
1490                 err = nfs4_handle_exception(server,
1491                                 _nfs4_server_capabilities(server, fhandle),
1492                                 &exception);
1493         } while (exception.retry);
1494         return err;
1495 }
1496
1497 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1498                 struct nfs_fsinfo *info)
1499 {
1500         struct nfs4_lookup_root_arg args = {
1501                 .bitmask = nfs4_fattr_bitmap,
1502         };
1503         struct nfs4_lookup_res res = {
1504                 .server = server,
1505                 .fattr = info->fattr,
1506                 .fh = fhandle,
1507         };
1508         struct rpc_message msg = {
1509                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1510                 .rpc_argp = &args,
1511                 .rpc_resp = &res,
1512         };
1513         nfs_fattr_init(info->fattr);
1514         return rpc_call_sync(server->client, &msg, 0);
1515 }
1516
1517 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1518                 struct nfs_fsinfo *info)
1519 {
1520         struct nfs4_exception exception = { };
1521         int err;
1522         do {
1523                 err = nfs4_handle_exception(server,
1524                                 _nfs4_lookup_root(server, fhandle, info),
1525                                 &exception);
1526         } while (exception.retry);
1527         return err;
1528 }
1529
1530 /*
1531  * get the file handle for the "/" directory on the server
1532  */
1533 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1534                               struct nfs_fsinfo *info)
1535 {
1536         int status;
1537
1538         status = nfs4_lookup_root(server, fhandle, info);
1539         if (status == 0)
1540                 status = nfs4_server_capabilities(server, fhandle);
1541         if (status == 0)
1542                 status = nfs4_do_fsinfo(server, fhandle, info);
1543         return nfs4_map_errors(status);
1544 }
1545
1546 /*
1547  * Get locations and (maybe) other attributes of a referral.
1548  * Note that we'll actually follow the referral later when
1549  * we detect fsid mismatch in inode revalidation
1550  */
1551 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1552 {
1553         int status = -ENOMEM;
1554         struct page *page = NULL;
1555         struct nfs4_fs_locations *locations = NULL;
1556
1557         page = alloc_page(GFP_KERNEL);
1558         if (page == NULL)
1559                 goto out;
1560         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1561         if (locations == NULL)
1562                 goto out;
1563
1564         status = nfs4_proc_fs_locations(dir, name, locations, page);
1565         if (status != 0)
1566                 goto out;
1567         /* Make sure server returned a different fsid for the referral */
1568         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1569                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1570                 status = -EIO;
1571                 goto out;
1572         }
1573
1574         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1575         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1576         if (!fattr->mode)
1577                 fattr->mode = S_IFDIR;
1578         memset(fhandle, 0, sizeof(struct nfs_fh));
1579 out:
1580         if (page)
1581                 __free_page(page);
1582         if (locations)
1583                 kfree(locations);
1584         return status;
1585 }
1586
1587 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1588 {
1589         struct nfs4_getattr_arg args = {
1590                 .fh = fhandle,
1591                 .bitmask = server->attr_bitmask,
1592         };
1593         struct nfs4_getattr_res res = {
1594                 .fattr = fattr,
1595                 .server = server,
1596         };
1597         struct rpc_message msg = {
1598                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1599                 .rpc_argp = &args,
1600                 .rpc_resp = &res,
1601         };
1602
1603         nfs_fattr_init(fattr);
1604         return rpc_call_sync(server->client, &msg, 0);
1605 }
1606
1607 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1608 {
1609         struct nfs4_exception exception = { };
1610         int err;
1611         do {
1612                 err = nfs4_handle_exception(server,
1613                                 _nfs4_proc_getattr(server, fhandle, fattr),
1614                                 &exception);
1615         } while (exception.retry);
1616         return err;
1617 }
1618
1619 /*
1620  * The file is not closed if it is opened due to the a request to change
1621  * the size of the file. The open call will not be needed once the
1622  * VFS layer lookup-intents are implemented.
1623  *
1624  * Close is called when the inode is destroyed.
1625  * If we haven't opened the file for O_WRONLY, we
1626  * need to in the size_change case to obtain a stateid.
1627  *
1628  * Got race?
1629  * Because OPEN is always done by name in nfsv4, it is
1630  * possible that we opened a different file by the same
1631  * name.  We can recognize this race condition, but we
1632  * can't do anything about it besides returning an error.
1633  *
1634  * This will be fixed with VFS changes (lookup-intent).
1635  */
1636 static int
1637 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1638                   struct iattr *sattr)
1639 {
1640         struct rpc_cred *cred;
1641         struct inode *inode = dentry->d_inode;
1642         struct nfs_open_context *ctx;
1643         struct nfs4_state *state = NULL;
1644         int status;
1645
1646         nfs_fattr_init(fattr);
1647
1648         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1649         if (IS_ERR(cred))
1650                 return PTR_ERR(cred);
1651
1652         /* Search for an existing open(O_WRITE) file */
1653         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1654         if (ctx != NULL)
1655                 state = ctx->state;
1656
1657         status = nfs4_do_setattr(inode, fattr, sattr, state);
1658         if (status == 0)
1659                 nfs_setattr_update_inode(inode, sattr);
1660         if (ctx != NULL)
1661                 put_nfs_open_context(ctx);
1662         put_rpccred(cred);
1663         return status;
1664 }
1665
1666 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1667                 const struct qstr *name, struct nfs_fh *fhandle,
1668                 struct nfs_fattr *fattr)
1669 {
1670         int                    status;
1671         struct nfs4_lookup_arg args = {
1672                 .bitmask = server->attr_bitmask,
1673                 .dir_fh = dirfh,
1674                 .name = name,
1675         };
1676         struct nfs4_lookup_res res = {
1677                 .server = server,
1678                 .fattr = fattr,
1679                 .fh = fhandle,
1680         };
1681         struct rpc_message msg = {
1682                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1683                 .rpc_argp = &args,
1684                 .rpc_resp = &res,
1685         };
1686
1687         nfs_fattr_init(fattr);
1688
1689         dprintk("NFS call  lookupfh %s\n", name->name);
1690         status = rpc_call_sync(server->client, &msg, 0);
1691         dprintk("NFS reply lookupfh: %d\n", status);
1692         return status;
1693 }
1694
1695 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1696                               struct qstr *name, struct nfs_fh *fhandle,
1697                               struct nfs_fattr *fattr)
1698 {
1699         struct nfs4_exception exception = { };
1700         int err;
1701         do {
1702                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1703                 /* FIXME: !!!! */
1704                 if (err == -NFS4ERR_MOVED) {
1705                         err = -EREMOTE;
1706                         break;
1707                 }
1708                 err = nfs4_handle_exception(server, err, &exception);
1709         } while (exception.retry);
1710         return err;
1711 }
1712
1713 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1714                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1715 {
1716         int status;
1717
1718         dprintk("NFS call  lookup %s\n", name->name);
1719         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1720         if (status == -NFS4ERR_MOVED)
1721                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1722         dprintk("NFS reply lookup: %d\n", status);
1723         return status;
1724 }
1725
1726 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1727 {
1728         struct nfs4_exception exception = { };
1729         int err;
1730         do {
1731                 err = nfs4_handle_exception(NFS_SERVER(dir),
1732                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1733                                 &exception);
1734         } while (exception.retry);
1735         return err;
1736 }
1737
1738 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1739 {
1740         struct nfs_server *server = NFS_SERVER(inode);
1741         struct nfs_fattr fattr;
1742         struct nfs4_accessargs args = {
1743                 .fh = NFS_FH(inode),
1744                 .bitmask = server->attr_bitmask,
1745         };
1746         struct nfs4_accessres res = {
1747                 .server = server,
1748                 .fattr = &fattr,
1749         };
1750         struct rpc_message msg = {
1751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1752                 .rpc_argp = &args,
1753                 .rpc_resp = &res,
1754                 .rpc_cred = entry->cred,
1755         };
1756         int mode = entry->mask;
1757         int status;
1758
1759         /*
1760          * Determine which access bits we want to ask for...
1761          */
1762         if (mode & MAY_READ)
1763                 args.access |= NFS4_ACCESS_READ;
1764         if (S_ISDIR(inode->i_mode)) {
1765                 if (mode & MAY_WRITE)
1766                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1767                 if (mode & MAY_EXEC)
1768                         args.access |= NFS4_ACCESS_LOOKUP;
1769         } else {
1770                 if (mode & MAY_WRITE)
1771                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1772                 if (mode & MAY_EXEC)
1773                         args.access |= NFS4_ACCESS_EXECUTE;
1774         }
1775         nfs_fattr_init(&fattr);
1776         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1777         if (!status) {
1778                 entry->mask = 0;
1779                 if (res.access & NFS4_ACCESS_READ)
1780                         entry->mask |= MAY_READ;
1781                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1782                         entry->mask |= MAY_WRITE;
1783                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1784                         entry->mask |= MAY_EXEC;
1785                 nfs_refresh_inode(inode, &fattr);
1786         }
1787         return status;
1788 }
1789
1790 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1791 {
1792         struct nfs4_exception exception = { };
1793         int err;
1794         do {
1795                 err = nfs4_handle_exception(NFS_SERVER(inode),
1796                                 _nfs4_proc_access(inode, entry),
1797                                 &exception);
1798         } while (exception.retry);
1799         return err;
1800 }
1801
1802 /*
1803  * TODO: For the time being, we don't try to get any attributes
1804  * along with any of the zero-copy operations READ, READDIR,
1805  * READLINK, WRITE.
1806  *
1807  * In the case of the first three, we want to put the GETATTR
1808  * after the read-type operation -- this is because it is hard
1809  * to predict the length of a GETATTR response in v4, and thus
1810  * align the READ data correctly.  This means that the GETATTR
1811  * may end up partially falling into the page cache, and we should
1812  * shift it into the 'tail' of the xdr_buf before processing.
1813  * To do this efficiently, we need to know the total length
1814  * of data received, which doesn't seem to be available outside
1815  * of the RPC layer.
1816  *
1817  * In the case of WRITE, we also want to put the GETATTR after
1818  * the operation -- in this case because we want to make sure
1819  * we get the post-operation mtime and size.  This means that
1820  * we can't use xdr_encode_pages() as written: we need a variant
1821  * of it which would leave room in the 'tail' iovec.
1822  *
1823  * Both of these changes to the XDR layer would in fact be quite
1824  * minor, but I decided to leave them for a subsequent patch.
1825  */
1826 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1827                 unsigned int pgbase, unsigned int pglen)
1828 {
1829         struct nfs4_readlink args = {
1830                 .fh       = NFS_FH(inode),
1831                 .pgbase   = pgbase,
1832                 .pglen    = pglen,
1833                 .pages    = &page,
1834         };
1835         struct rpc_message msg = {
1836                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1837                 .rpc_argp = &args,
1838                 .rpc_resp = NULL,
1839         };
1840
1841         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1842 }
1843
1844 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1845                 unsigned int pgbase, unsigned int pglen)
1846 {
1847         struct nfs4_exception exception = { };
1848         int err;
1849         do {
1850                 err = nfs4_handle_exception(NFS_SERVER(inode),
1851                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1852                                 &exception);
1853         } while (exception.retry);
1854         return err;
1855 }
1856
1857 /*
1858  * Got race?
1859  * We will need to arrange for the VFS layer to provide an atomic open.
1860  * Until then, this create/open method is prone to inefficiency and race
1861  * conditions due to the lookup, create, and open VFS calls from sys_open()
1862  * placed on the wire.
1863  *
1864  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1865  * The file will be opened again in the subsequent VFS open call
1866  * (nfs4_proc_file_open).
1867  *
1868  * The open for read will just hang around to be used by any process that
1869  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1870  */
1871
1872 static int
1873 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1874                  int flags, struct nameidata *nd)
1875 {
1876         struct path path = {
1877                 .mnt = nd->mnt,
1878                 .dentry = dentry,
1879         };
1880         struct nfs4_state *state;
1881         struct rpc_cred *cred;
1882         int status = 0;
1883
1884         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1885         if (IS_ERR(cred)) {
1886                 status = PTR_ERR(cred);
1887                 goto out;
1888         }
1889         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1890         put_rpccred(cred);
1891         d_drop(dentry);
1892         if (IS_ERR(state)) {
1893                 status = PTR_ERR(state);
1894                 goto out;
1895         }
1896         d_add(dentry, igrab(state->inode));
1897         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1898         if (flags & O_EXCL) {
1899                 struct nfs_fattr fattr;
1900                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1901                 if (status == 0)
1902                         nfs_setattr_update_inode(state->inode, sattr);
1903                 nfs_post_op_update_inode(state->inode, &fattr);
1904         }
1905         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1906                 status = nfs4_intent_set_file(nd, &path, state);
1907         else
1908                 nfs4_close_sync(&path, state, flags);
1909 out:
1910         return status;
1911 }
1912
1913 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1914 {
1915         struct nfs_server *server = NFS_SERVER(dir);
1916         struct nfs_removeargs args = {
1917                 .fh = NFS_FH(dir),
1918                 .name.len = name->len,
1919                 .name.name = name->name,
1920                 .bitmask = server->attr_bitmask,
1921         };
1922         struct nfs_removeres res = {
1923                 .server = server,
1924         };
1925         struct rpc_message msg = {
1926                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1927                 .rpc_argp = &args,
1928                 .rpc_resp = &res,
1929         };
1930         int                     status;
1931
1932         nfs_fattr_init(&res.dir_attr);
1933         status = rpc_call_sync(server->client, &msg, 0);
1934         if (status == 0) {
1935                 update_changeattr(dir, &res.cinfo);
1936                 nfs_post_op_update_inode(dir, &res.dir_attr);
1937         }
1938         return status;
1939 }
1940
1941 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1942 {
1943         struct nfs4_exception exception = { };
1944         int err;
1945         do {
1946                 err = nfs4_handle_exception(NFS_SERVER(dir),
1947                                 _nfs4_proc_remove(dir, name),
1948                                 &exception);
1949         } while (exception.retry);
1950         return err;
1951 }
1952
1953 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1954 {
1955         struct nfs_server *server = NFS_SERVER(dir);
1956         struct nfs_removeargs *args = msg->rpc_argp;
1957         struct nfs_removeres *res = msg->rpc_resp;
1958
1959         args->bitmask = server->attr_bitmask;
1960         res->server = server;
1961         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1962 }
1963
1964 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1965 {
1966         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1967
1968         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1969                 return 0;
1970         update_changeattr(dir, &res->cinfo);
1971         nfs_post_op_update_inode(dir, &res->dir_attr);
1972         return 1;
1973 }
1974
1975 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1976                 struct inode *new_dir, struct qstr *new_name)
1977 {
1978         struct nfs_server *server = NFS_SERVER(old_dir);
1979         struct nfs4_rename_arg arg = {
1980                 .old_dir = NFS_FH(old_dir),
1981                 .new_dir = NFS_FH(new_dir),
1982                 .old_name = old_name,
1983                 .new_name = new_name,
1984                 .bitmask = server->attr_bitmask,
1985         };
1986         struct nfs_fattr old_fattr, new_fattr;
1987         struct nfs4_rename_res res = {
1988                 .server = server,
1989                 .old_fattr = &old_fattr,
1990                 .new_fattr = &new_fattr,
1991         };
1992         struct rpc_message msg = {
1993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1994                 .rpc_argp = &arg,
1995                 .rpc_resp = &res,
1996         };
1997         int                     status;
1998
1999         nfs_fattr_init(res.old_fattr);
2000         nfs_fattr_init(res.new_fattr);
2001         status = rpc_call_sync(server->client, &msg, 0);
2002
2003         if (!status) {
2004                 update_changeattr(old_dir, &res.old_cinfo);
2005                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2006                 update_changeattr(new_dir, &res.new_cinfo);
2007                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2008         }
2009         return status;
2010 }
2011
2012 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2013                 struct inode *new_dir, struct qstr *new_name)
2014 {
2015         struct nfs4_exception exception = { };
2016         int err;
2017         do {
2018                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2019                                 _nfs4_proc_rename(old_dir, old_name,
2020                                         new_dir, new_name),
2021                                 &exception);
2022         } while (exception.retry);
2023         return err;
2024 }
2025
2026 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2027 {
2028         struct nfs_server *server = NFS_SERVER(inode);
2029         struct nfs4_link_arg arg = {
2030                 .fh     = NFS_FH(inode),
2031                 .dir_fh = NFS_FH(dir),
2032                 .name   = name,
2033                 .bitmask = server->attr_bitmask,
2034         };
2035         struct nfs_fattr fattr, dir_attr;
2036         struct nfs4_link_res res = {
2037                 .server = server,
2038                 .fattr = &fattr,
2039                 .dir_attr = &dir_attr,
2040         };
2041         struct rpc_message msg = {
2042                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2043                 .rpc_argp = &arg,
2044                 .rpc_resp = &res,
2045         };
2046         int                     status;
2047
2048         nfs_fattr_init(res.fattr);
2049         nfs_fattr_init(res.dir_attr);
2050         status = rpc_call_sync(server->client, &msg, 0);
2051         if (!status) {
2052                 update_changeattr(dir, &res.cinfo);
2053                 nfs_post_op_update_inode(dir, res.dir_attr);
2054                 nfs_post_op_update_inode(inode, res.fattr);
2055         }
2056
2057         return status;
2058 }
2059
2060 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2061 {
2062         struct nfs4_exception exception = { };
2063         int err;
2064         do {
2065                 err = nfs4_handle_exception(NFS_SERVER(inode),
2066                                 _nfs4_proc_link(inode, dir, name),
2067                                 &exception);
2068         } while (exception.retry);
2069         return err;
2070 }
2071
2072 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2073                 struct page *page, unsigned int len, struct iattr *sattr)
2074 {
2075         struct nfs_server *server = NFS_SERVER(dir);
2076         struct nfs_fh fhandle;
2077         struct nfs_fattr fattr, dir_fattr;
2078         struct nfs4_create_arg arg = {
2079                 .dir_fh = NFS_FH(dir),
2080                 .server = server,
2081                 .name = &dentry->d_name,
2082                 .attrs = sattr,
2083                 .ftype = NF4LNK,
2084                 .bitmask = server->attr_bitmask,
2085         };
2086         struct nfs4_create_res res = {
2087                 .server = server,
2088                 .fh = &fhandle,
2089                 .fattr = &fattr,
2090                 .dir_fattr = &dir_fattr,
2091         };
2092         struct rpc_message msg = {
2093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2094                 .rpc_argp = &arg,
2095                 .rpc_resp = &res,
2096         };
2097         int                     status;
2098
2099         if (len > NFS4_MAXPATHLEN)
2100                 return -ENAMETOOLONG;
2101
2102         arg.u.symlink.pages = &page;
2103         arg.u.symlink.len = len;
2104         nfs_fattr_init(&fattr);
2105         nfs_fattr_init(&dir_fattr);
2106
2107         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2108         if (!status) {
2109                 update_changeattr(dir, &res.dir_cinfo);
2110                 nfs_post_op_update_inode(dir, res.dir_fattr);
2111                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2112         }
2113         return status;
2114 }
2115
2116 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2117                 struct page *page, unsigned int len, struct iattr *sattr)
2118 {
2119         struct nfs4_exception exception = { };
2120         int err;
2121         do {
2122                 err = nfs4_handle_exception(NFS_SERVER(dir),
2123                                 _nfs4_proc_symlink(dir, dentry, page,
2124                                                         len, sattr),
2125                                 &exception);
2126         } while (exception.retry);
2127         return err;
2128 }
2129
2130 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2131                 struct iattr *sattr)
2132 {
2133         struct nfs_server *server = NFS_SERVER(dir);
2134         struct nfs_fh fhandle;
2135         struct nfs_fattr fattr, dir_fattr;
2136         struct nfs4_create_arg arg = {
2137                 .dir_fh = NFS_FH(dir),
2138                 .server = server,
2139                 .name = &dentry->d_name,
2140                 .attrs = sattr,
2141                 .ftype = NF4DIR,
2142                 .bitmask = server->attr_bitmask,
2143         };
2144         struct nfs4_create_res res = {
2145                 .server = server,
2146                 .fh = &fhandle,
2147                 .fattr = &fattr,
2148                 .dir_fattr = &dir_fattr,
2149         };
2150         struct rpc_message msg = {
2151                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2152                 .rpc_argp = &arg,
2153                 .rpc_resp = &res,
2154         };
2155         int                     status;
2156
2157         nfs_fattr_init(&fattr);
2158         nfs_fattr_init(&dir_fattr);
2159
2160         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2161         if (!status) {
2162                 update_changeattr(dir, &res.dir_cinfo);
2163                 nfs_post_op_update_inode(dir, res.dir_fattr);
2164                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2165         }
2166         return status;
2167 }
2168
2169 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2170                 struct iattr *sattr)
2171 {
2172         struct nfs4_exception exception = { };
2173         int err;
2174         do {
2175                 err = nfs4_handle_exception(NFS_SERVER(dir),
2176                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2177                                 &exception);
2178         } while (exception.retry);
2179         return err;
2180 }
2181
2182 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2183                   u64 cookie, struct page *page, unsigned int count, int plus)
2184 {
2185         struct inode            *dir = dentry->d_inode;
2186         struct nfs4_readdir_arg args = {
2187                 .fh = NFS_FH(dir),
2188                 .pages = &page,
2189                 .pgbase = 0,
2190                 .count = count,
2191                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2192         };
2193         struct nfs4_readdir_res res;
2194         struct rpc_message msg = {
2195                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2196                 .rpc_argp = &args,
2197                 .rpc_resp = &res,
2198                 .rpc_cred = cred,
2199         };
2200         int                     status;
2201
2202         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2203                         dentry->d_parent->d_name.name,
2204                         dentry->d_name.name,
2205                         (unsigned long long)cookie);
2206         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2207         res.pgbase = args.pgbase;
2208         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2209         if (status == 0)
2210                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2211
2212         nfs_invalidate_atime(dir);
2213
2214         dprintk("%s: returns %d\n", __FUNCTION__, status);
2215         return status;
2216 }
2217
2218 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2219                   u64 cookie, struct page *page, unsigned int count, int plus)
2220 {
2221         struct nfs4_exception exception = { };
2222         int err;
2223         do {
2224                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2225                                 _nfs4_proc_readdir(dentry, cred, cookie,
2226                                         page, count, plus),
2227                                 &exception);
2228         } while (exception.retry);
2229         return err;
2230 }
2231
2232 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2233                 struct iattr *sattr, dev_t rdev)
2234 {
2235         struct nfs_server *server = NFS_SERVER(dir);
2236         struct nfs_fh fh;
2237         struct nfs_fattr fattr, dir_fattr;
2238         struct nfs4_create_arg arg = {
2239                 .dir_fh = NFS_FH(dir),
2240                 .server = server,
2241                 .name = &dentry->d_name,
2242                 .attrs = sattr,
2243                 .bitmask = server->attr_bitmask,
2244         };
2245         struct nfs4_create_res res = {
2246                 .server = server,
2247                 .fh = &fh,
2248                 .fattr = &fattr,
2249                 .dir_fattr = &dir_fattr,
2250         };
2251         struct rpc_message msg = {
2252                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2253                 .rpc_argp = &arg,
2254                 .rpc_resp = &res,
2255         };
2256         int                     status;
2257         int                     mode = sattr->ia_mode;
2258
2259         nfs_fattr_init(&fattr);
2260         nfs_fattr_init(&dir_fattr);
2261
2262         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2263         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2264         if (S_ISFIFO(mode))
2265                 arg.ftype = NF4FIFO;
2266         else if (S_ISBLK(mode)) {
2267                 arg.ftype = NF4BLK;
2268                 arg.u.device.specdata1 = MAJOR(rdev);
2269                 arg.u.device.specdata2 = MINOR(rdev);
2270         }
2271         else if (S_ISCHR(mode)) {
2272                 arg.ftype = NF4CHR;
2273                 arg.u.device.specdata1 = MAJOR(rdev);
2274                 arg.u.device.specdata2 = MINOR(rdev);
2275         }
2276         else
2277                 arg.ftype = NF4SOCK;
2278
2279         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2280         if (status == 0) {
2281                 update_changeattr(dir, &res.dir_cinfo);
2282                 nfs_post_op_update_inode(dir, res.dir_fattr);
2283                 status = nfs_instantiate(dentry, &fh, &fattr);
2284         }
2285         return status;
2286 }
2287
2288 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2289                 struct iattr *sattr, dev_t rdev)
2290 {
2291         struct nfs4_exception exception = { };
2292         int err;
2293         do {
2294                 err = nfs4_handle_exception(NFS_SERVER(dir),
2295                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2296                                 &exception);
2297         } while (exception.retry);
2298         return err;
2299 }
2300
2301 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2302                  struct nfs_fsstat *fsstat)
2303 {
2304         struct nfs4_statfs_arg args = {
2305                 .fh = fhandle,
2306                 .bitmask = server->attr_bitmask,
2307         };
2308         struct rpc_message msg = {
2309                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2310                 .rpc_argp = &args,
2311                 .rpc_resp = fsstat,
2312         };
2313
2314         nfs_fattr_init(fsstat->fattr);
2315         return rpc_call_sync(server->client, &msg, 0);
2316 }
2317
2318 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2319 {
2320         struct nfs4_exception exception = { };
2321         int err;
2322         do {
2323                 err = nfs4_handle_exception(server,
2324                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2325                                 &exception);
2326         } while (exception.retry);
2327         return err;
2328 }
2329
2330 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2331                 struct nfs_fsinfo *fsinfo)
2332 {
2333         struct nfs4_fsinfo_arg args = {
2334                 .fh = fhandle,
2335                 .bitmask = server->attr_bitmask,
2336         };
2337         struct rpc_message msg = {
2338                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2339                 .rpc_argp = &args,
2340                 .rpc_resp = fsinfo,
2341         };
2342
2343         return rpc_call_sync(server->client, &msg, 0);
2344 }
2345
2346 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2347 {
2348         struct nfs4_exception exception = { };
2349         int err;
2350
2351         do {
2352                 err = nfs4_handle_exception(server,
2353                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2354                                 &exception);
2355         } while (exception.retry);
2356         return err;
2357 }
2358
2359 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2360 {
2361         nfs_fattr_init(fsinfo->fattr);
2362         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2363 }
2364
2365 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2366                 struct nfs_pathconf *pathconf)
2367 {
2368         struct nfs4_pathconf_arg args = {
2369                 .fh = fhandle,
2370                 .bitmask = server->attr_bitmask,
2371         };
2372         struct rpc_message msg = {
2373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2374                 .rpc_argp = &args,
2375                 .rpc_resp = pathconf,
2376         };
2377
2378         /* None of the pathconf attributes are mandatory to implement */
2379         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2380                 memset(pathconf, 0, sizeof(*pathconf));
2381                 return 0;
2382         }
2383
2384         nfs_fattr_init(pathconf->fattr);
2385         return rpc_call_sync(server->client, &msg, 0);
2386 }
2387
2388 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2389                 struct nfs_pathconf *pathconf)
2390 {
2391         struct nfs4_exception exception = { };
2392         int err;
2393
2394         do {
2395                 err = nfs4_handle_exception(server,
2396                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2397                                 &exception);
2398         } while (exception.retry);
2399         return err;
2400 }
2401
2402 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2403 {
2404         struct nfs_server *server = NFS_SERVER(data->inode);
2405
2406         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2407                 rpc_restart_call(task);
2408                 return -EAGAIN;
2409         }
2410
2411         nfs_invalidate_atime(data->inode);
2412         if (task->tk_status > 0)
2413                 renew_lease(server, data->timestamp);
2414         return 0;
2415 }
2416
2417 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2418 {
2419         struct rpc_message msg = {
2420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2421                 .rpc_argp = &data->args,
2422                 .rpc_resp = &data->res,
2423                 .rpc_cred = data->cred,
2424         };
2425
2426         data->timestamp   = jiffies;
2427
2428         rpc_call_setup(&data->task, &msg, 0);
2429 }
2430
2431 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2432 {
2433         struct inode *inode = data->inode;
2434
2435         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2436                 rpc_restart_call(task);
2437                 return -EAGAIN;
2438         }
2439         if (task->tk_status >= 0) {
2440                 renew_lease(NFS_SERVER(inode), data->timestamp);
2441                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2442         }
2443         return 0;
2444 }
2445
2446 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2447 {
2448         struct rpc_message msg = {
2449                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2450                 .rpc_argp = &data->args,
2451                 .rpc_resp = &data->res,
2452                 .rpc_cred = data->cred,
2453         };
2454         struct inode *inode = data->inode;
2455         struct nfs_server *server = NFS_SERVER(inode);
2456         int stable;
2457
2458         if (how & FLUSH_STABLE) {
2459                 if (!NFS_I(inode)->ncommit)
2460                         stable = NFS_FILE_SYNC;
2461                 else
2462                         stable = NFS_DATA_SYNC;
2463         } else
2464                 stable = NFS_UNSTABLE;
2465         data->args.stable = stable;
2466         data->args.bitmask = server->attr_bitmask;
2467         data->res.server = server;
2468
2469         data->timestamp   = jiffies;
2470
2471         /* Finalize the task. */
2472         rpc_call_setup(&data->task, &msg, 0);
2473 }
2474
2475 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2476 {
2477         struct inode *inode = data->inode;
2478
2479         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2480                 rpc_restart_call(task);
2481                 return -EAGAIN;
2482         }
2483         nfs_refresh_inode(inode, data->res.fattr);
2484         return 0;
2485 }
2486
2487 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2488 {
2489         struct rpc_message msg = {
2490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2491                 .rpc_argp = &data->args,
2492                 .rpc_resp = &data->res,
2493                 .rpc_cred = data->cred,
2494         };
2495         struct nfs_server *server = NFS_SERVER(data->inode);
2496
2497         data->args.bitmask = server->attr_bitmask;
2498         data->res.server = server;
2499
2500         rpc_call_setup(&data->task, &msg, 0);
2501 }
2502
2503 /*
2504  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2505  * standalone procedure for queueing an asynchronous RENEW.
2506  */
2507 static void nfs4_renew_done(struct rpc_task *task, void *data)
2508 {
2509         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2510         unsigned long timestamp = (unsigned long)data;
2511
2512         if (task->tk_status < 0) {
2513                 switch (task->tk_status) {
2514                         case -NFS4ERR_STALE_CLIENTID:
2515                         case -NFS4ERR_EXPIRED:
2516                         case -NFS4ERR_CB_PATH_DOWN:
2517                                 nfs4_schedule_state_recovery(clp);
2518                 }
2519                 return;
2520         }
2521         spin_lock(&clp->cl_lock);
2522         if (time_before(clp->cl_last_renewal,timestamp))
2523                 clp->cl_last_renewal = timestamp;
2524         spin_unlock(&clp->cl_lock);
2525 }
2526
2527 static const struct rpc_call_ops nfs4_renew_ops = {
2528         .rpc_call_done = nfs4_renew_done,
2529 };
2530
2531 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2532 {
2533         struct rpc_message msg = {
2534                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2535                 .rpc_argp       = clp,
2536                 .rpc_cred       = cred,
2537         };
2538
2539         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2540                         &nfs4_renew_ops, (void *)jiffies);
2541 }
2542
2543 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2544 {
2545         struct rpc_message msg = {
2546                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2547                 .rpc_argp       = clp,
2548                 .rpc_cred       = cred,
2549         };
2550         unsigned long now = jiffies;
2551         int status;
2552
2553         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2554         if (status < 0)
2555                 return status;
2556         spin_lock(&clp->cl_lock);
2557         if (time_before(clp->cl_last_renewal,now))
2558                 clp->cl_last_renewal = now;
2559         spin_unlock(&clp->cl_lock);
2560         return 0;
2561 }
2562
2563 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2564 {
2565         return (server->caps & NFS_CAP_ACLS)
2566                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2567                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2568 }
2569
2570 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2571  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2572  * the stack.
2573  */
2574 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2575
2576 static void buf_to_pages(const void *buf, size_t buflen,
2577                 struct page **pages, unsigned int *pgbase)
2578 {
2579         const void *p = buf;
2580
2581         *pgbase = offset_in_page(buf);
2582         p -= *pgbase;
2583         while (p < buf + buflen) {
2584                 *(pages++) = virt_to_page(p);
2585                 p += PAGE_CACHE_SIZE;
2586         }
2587 }
2588
2589 struct nfs4_cached_acl {
2590         int cached;
2591         size_t len;
2592         char data[0];
2593 };
2594
2595 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2596 {
2597         struct nfs_inode *nfsi = NFS_I(inode);
2598
2599         spin_lock(&inode->i_lock);
2600         kfree(nfsi->nfs4_acl);
2601         nfsi->nfs4_acl = acl;
2602         spin_unlock(&inode->i_lock);
2603 }
2604
2605 static void nfs4_zap_acl_attr(struct inode *inode)
2606 {
2607         nfs4_set_cached_acl(inode, NULL);
2608 }
2609
2610 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2611 {
2612         struct nfs_inode *nfsi = NFS_I(inode);
2613         struct nfs4_cached_acl *acl;
2614         int ret = -ENOENT;
2615
2616         spin_lock(&inode->i_lock);
2617         acl = nfsi->nfs4_acl;
2618         if (acl == NULL)
2619                 goto out;
2620         if (buf == NULL) /* user is just asking for length */
2621                 goto out_len;
2622         if (acl->cached == 0)
2623                 goto out;
2624         ret = -ERANGE; /* see getxattr(2) man page */
2625         if (acl->len > buflen)
2626                 goto out;
2627         memcpy(buf, acl->data, acl->len);
2628 out_len:
2629         ret = acl->len;
2630 out:
2631         spin_unlock(&inode->i_lock);
2632         return ret;
2633 }
2634
2635 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2636 {
2637         struct nfs4_cached_acl *acl;
2638
2639         if (buf && acl_len <= PAGE_SIZE) {
2640                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2641                 if (acl == NULL)
2642                         goto out;
2643                 acl->cached = 1;
2644                 memcpy(acl->data, buf, acl_len);
2645         } else {
2646                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2647                 if (acl == NULL)
2648                         goto out;
2649                 acl->cached = 0;
2650         }
2651         acl->len = acl_len;
2652 out:
2653         nfs4_set_cached_acl(inode, acl);
2654 }
2655
2656 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2657 {
2658         struct page *pages[NFS4ACL_MAXPAGES];
2659         struct nfs_getaclargs args = {
2660                 .fh = NFS_FH(inode),
2661                 .acl_pages = pages,
2662                 .acl_len = buflen,
2663         };
2664         size_t resp_len = buflen;
2665         void *resp_buf;
2666         struct rpc_message msg = {
2667                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2668                 .rpc_argp = &args,
2669                 .rpc_resp = &resp_len,
2670         };
2671         struct page *localpage = NULL;
2672         int ret;
2673
2674         if (buflen < PAGE_SIZE) {
2675                 /* As long as we're doing a round trip to the server anyway,
2676                  * let's be prepared for a page of acl data. */
2677                 localpage = alloc_page(GFP_KERNEL);
2678                 resp_buf = page_address(localpage);
2679                 if (localpage == NULL)
2680                         return -ENOMEM;
2681                 args.acl_pages[0] = localpage;
2682                 args.acl_pgbase = 0;
2683                 resp_len = args.acl_len = PAGE_SIZE;
2684         } else {
2685                 resp_buf = buf;
2686                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2687         }
2688         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2689         if (ret)
2690                 goto out_free;
2691         if (resp_len > args.acl_len)
2692                 nfs4_write_cached_acl(inode, NULL, resp_len);
2693         else
2694                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2695         if (buf) {
2696                 ret = -ERANGE;
2697                 if (resp_len > buflen)
2698                         goto out_free;
2699                 if (localpage)
2700                         memcpy(buf, resp_buf, resp_len);
2701         }
2702         ret = resp_len;
2703 out_free:
2704         if (localpage)
2705                 __free_page(localpage);
2706         return ret;
2707 }
2708
2709 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2710 {
2711         struct nfs4_exception exception = { };
2712         ssize_t ret;
2713         do {
2714                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2715                 if (ret >= 0)
2716                         break;
2717                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2718         } while (exception.retry);
2719         return ret;
2720 }
2721
2722 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2723 {
2724         struct nfs_server *server = NFS_SERVER(inode);
2725         int ret;
2726
2727         if (!nfs4_server_supports_acls(server))
2728                 return -EOPNOTSUPP;
2729         ret = nfs_revalidate_inode(server, inode);
2730         if (ret < 0)
2731                 return ret;
2732         ret = nfs4_read_cached_acl(inode, buf, buflen);
2733         if (ret != -ENOENT)
2734                 return ret;
2735         return nfs4_get_acl_uncached(inode, buf, buflen);
2736 }
2737
2738 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2739 {
2740         struct nfs_server *server = NFS_SERVER(inode);
2741         struct page *pages[NFS4ACL_MAXPAGES];
2742         struct nfs_setaclargs arg = {
2743                 .fh             = NFS_FH(inode),
2744                 .acl_pages      = pages,
2745                 .acl_len        = buflen,
2746         };
2747         struct rpc_message msg = {
2748                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2749                 .rpc_argp       = &arg,
2750                 .rpc_resp       = NULL,
2751         };
2752         int ret;
2753
2754         if (!nfs4_server_supports_acls(server))
2755                 return -EOPNOTSUPP;
2756         nfs_inode_return_delegation(inode);
2757         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2758         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2759         nfs_zap_caches(inode);
2760         return ret;
2761 }
2762
2763 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2764 {
2765         struct nfs4_exception exception = { };
2766         int err;
2767         do {
2768                 err = nfs4_handle_exception(NFS_SERVER(inode),
2769                                 __nfs4_proc_set_acl(inode, buf, buflen),
2770                                 &exception);
2771         } while (exception.retry);
2772         return err;
2773 }
2774
2775 static int
2776 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2777 {
2778         struct nfs_client *clp = server->nfs_client;
2779
2780         if (!clp || task->tk_status >= 0)
2781                 return 0;
2782         switch(task->tk_status) {
2783                 case -NFS4ERR_STALE_CLIENTID:
2784                 case -NFS4ERR_STALE_STATEID:
2785                 case -NFS4ERR_EXPIRED:
2786                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2787                         nfs4_schedule_state_recovery(clp);
2788                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2789                                 rpc_wake_up_task(task);
2790                         task->tk_status = 0;
2791                         return -EAGAIN;
2792                 case -NFS4ERR_DELAY:
2793                         nfs_inc_server_stats((struct nfs_server *) server,
2794                                                 NFSIOS_DELAY);
2795                 case -NFS4ERR_GRACE:
2796                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2797                         task->tk_status = 0;
2798                         return -EAGAIN;
2799                 case -NFS4ERR_OLD_STATEID:
2800                         task->tk_status = 0;
2801                         return -EAGAIN;
2802         }
2803         task->tk_status = nfs4_map_errors(task->tk_status);
2804         return 0;
2805 }
2806
2807 static int nfs4_wait_bit_interruptible(void *word)
2808 {
2809         if (signal_pending(current))
2810                 return -ERESTARTSYS;
2811         schedule();
2812         return 0;
2813 }
2814
2815 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2816 {
2817         sigset_t oldset;
2818         int res;
2819
2820         might_sleep();
2821
2822         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2823
2824         rpc_clnt_sigmask(clnt, &oldset);
2825         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2826                         nfs4_wait_bit_interruptible,
2827                         TASK_INTERRUPTIBLE);
2828         rpc_clnt_sigunmask(clnt, &oldset);
2829
2830         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2831         return res;
2832 }
2833
2834 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2835 {
2836         sigset_t oldset;
2837         int res = 0;
2838
2839         might_sleep();
2840
2841         if (*timeout <= 0)
2842                 *timeout = NFS4_POLL_RETRY_MIN;
2843         if (*timeout > NFS4_POLL_RETRY_MAX)
2844                 *timeout = NFS4_POLL_RETRY_MAX;
2845         rpc_clnt_sigmask(clnt, &oldset);
2846         if (clnt->cl_intr) {
2847                 schedule_timeout_interruptible(*timeout);
2848                 if (signalled())
2849                         res = -ERESTARTSYS;
2850         } else
2851                 schedule_timeout_uninterruptible(*timeout);
2852         rpc_clnt_sigunmask(clnt, &oldset);
2853         *timeout <<= 1;
2854         return res;
2855 }
2856
2857 /* This is the error handling routine for processes that are allowed
2858  * to sleep.
2859  */
2860 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2861 {
2862         struct nfs_client *clp = server->nfs_client;
2863         int ret = errorcode;
2864
2865         exception->retry = 0;
2866         switch(errorcode) {
2867                 case 0:
2868                         return 0;
2869                 case -NFS4ERR_STALE_CLIENTID:
2870                 case -NFS4ERR_STALE_STATEID:
2871                 case -NFS4ERR_EXPIRED:
2872                         nfs4_schedule_state_recovery(clp);
2873                         ret = nfs4_wait_clnt_recover(server->client, clp);
2874                         if (ret == 0)
2875                                 exception->retry = 1;
2876                         break;
2877                 case -NFS4ERR_FILE_OPEN:
2878                 case -NFS4ERR_GRACE:
2879                 case -NFS4ERR_DELAY:
2880                         ret = nfs4_delay(server->client, &exception->timeout);
2881                         if (ret != 0)
2882                                 break;
2883                 case -NFS4ERR_OLD_STATEID:
2884                         exception->retry = 1;
2885         }
2886         /* We failed to handle the error */
2887         return nfs4_map_errors(ret);
2888 }
2889
2890 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2891 {
2892         nfs4_verifier sc_verifier;
2893         struct nfs4_setclientid setclientid = {
2894                 .sc_verifier = &sc_verifier,
2895                 .sc_prog = program,
2896         };
2897         struct rpc_message msg = {
2898                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2899                 .rpc_argp = &setclientid,
2900                 .rpc_resp = clp,
2901                 .rpc_cred = cred,
2902         };
2903         __be32 *p;
2904         int loop = 0;
2905         int status;
2906
2907         p = (__be32*)sc_verifier.data;
2908         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2909         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2910
2911         for(;;) {
2912                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2913                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2914                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2915                                 cred->cr_ops->cr_name,
2916                                 clp->cl_id_uniquifier);
2917                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2918                                 sizeof(setclientid.sc_netid), "tcp");
2919                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2920                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2921                                 clp->cl_ipaddr, port >> 8, port & 255);
2922
2923                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2924                 if (status != -NFS4ERR_CLID_INUSE)
2925                         break;
2926                 if (signalled())
2927                         break;
2928                 if (loop++ & 1)
2929                         ssleep(clp->cl_lease_time + 1);
2930                 else
2931                         if (++clp->cl_id_uniquifier == 0)
2932                                 break;
2933         }
2934         return status;
2935 }
2936
2937 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2938 {
2939         struct nfs_fsinfo fsinfo;
2940         struct rpc_message msg = {
2941                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2942                 .rpc_argp = clp,
2943                 .rpc_resp = &fsinfo,
2944                 .rpc_cred = cred,
2945         };
2946         unsigned long now;
2947         int status;
2948
2949         now = jiffies;
2950         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2951         if (status == 0) {
2952                 spin_lock(&clp->cl_lock);
2953                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2954                 clp->cl_last_renewal = now;
2955                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2956                 spin_unlock(&clp->cl_lock);
2957         }
2958         return status;
2959 }
2960
2961 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2962 {
2963         long timeout;
2964         int err;
2965         do {
2966                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2967                 switch (err) {
2968                         case 0:
2969                                 return err;
2970                         case -NFS4ERR_RESOURCE:
2971                                 /* The IBM lawyers misread another document! */
2972                         case -NFS4ERR_DELAY:
2973                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2974                 }
2975         } while (err == 0);
2976         return err;
2977 }
2978
2979 struct nfs4_delegreturndata {
2980         struct nfs4_delegreturnargs args;
2981         struct nfs4_delegreturnres res;
2982         struct nfs_fh fh;
2983         nfs4_stateid stateid;
2984         struct rpc_cred *cred;
2985         unsigned long timestamp;
2986         struct nfs_fattr fattr;
2987         int rpc_status;
2988 };
2989
2990 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2991 {
2992         struct nfs4_delegreturndata *data = calldata;
2993         struct rpc_message msg = {
2994                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2995                 .rpc_argp = &data->args,
2996                 .rpc_resp = &data->res,
2997                 .rpc_cred = data->cred,
2998         };
2999         nfs_fattr_init(data->res.fattr);
3000         rpc_call_setup(task, &msg, 0);
3001 }
3002
3003 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3004 {
3005         struct nfs4_delegreturndata *data = calldata;
3006         data->rpc_status = task->tk_status;
3007         if (data->rpc_status == 0)
3008                 renew_lease(data->res.server, data->timestamp);
3009 }
3010
3011 static void nfs4_delegreturn_release(void *calldata)
3012 {
3013         struct nfs4_delegreturndata *data = calldata;
3014
3015         put_rpccred(data->cred);
3016         kfree(calldata);
3017 }
3018
3019 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3020         .rpc_call_prepare = nfs4_delegreturn_prepare,
3021         .rpc_call_done = nfs4_delegreturn_done,
3022         .rpc_release = nfs4_delegreturn_release,
3023 };
3024
3025 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3026 {
3027         struct nfs4_delegreturndata *data;
3028         struct nfs_server *server = NFS_SERVER(inode);
3029         struct rpc_task *task;
3030         int status;
3031
3032         data = kmalloc(sizeof(*data), GFP_KERNEL);
3033         if (data == NULL)
3034                 return -ENOMEM;
3035         data->args.fhandle = &data->fh;
3036         data->args.stateid = &data->stateid;
3037         data->args.bitmask = server->attr_bitmask;
3038         nfs_copy_fh(&data->fh, NFS_FH(inode));
3039         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3040         data->res.fattr = &data->fattr;
3041         data->res.server = server;
3042         data->cred = get_rpccred(cred);
3043         data->timestamp = jiffies;
3044         data->rpc_status = 0;
3045
3046         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3047         if (IS_ERR(task))
3048                 return PTR_ERR(task);
3049         status = nfs4_wait_for_completion_rpc_task(task);
3050         if (status == 0) {
3051                 status = data->rpc_status;
3052                 if (status == 0)
3053                         nfs_refresh_inode(inode, &data->fattr);
3054         }
3055         rpc_put_task(task);
3056         return status;
3057 }
3058
3059 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3060 {
3061         struct nfs_server *server = NFS_SERVER(inode);
3062         struct nfs4_exception exception = { };
3063         int err;
3064         do {
3065                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3066                 switch (err) {
3067                         case -NFS4ERR_STALE_STATEID:
3068                         case -NFS4ERR_EXPIRED:
3069                         case 0:
3070                                 return 0;
3071                 }
3072                 err = nfs4_handle_exception(server, err, &exception);
3073         } while (exception.retry);
3074         return err;
3075 }
3076
3077 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3078 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3079
3080 /*
3081  * sleep, with exponential backoff, and retry the LOCK operation.
3082  */
3083 static unsigned long
3084 nfs4_set_lock_task_retry(unsigned long timeout)
3085 {
3086         schedule_timeout_interruptible(timeout);
3087         timeout <<= 1;
3088         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3089                 return NFS4_LOCK_MAXTIMEOUT;
3090         return timeout;
3091 }
3092
3093 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3094 {
3095         struct inode *inode = state->inode;
3096         struct nfs_server *server = NFS_SERVER(inode);
3097         struct nfs_client *clp = server->nfs_client;
3098         struct nfs_lockt_args arg = {
3099                 .fh = NFS_FH(inode),
3100                 .fl = request,
3101         };
3102         struct nfs_lockt_res res = {
3103                 .denied = request,
3104         };
3105         struct rpc_message msg = {
3106                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3107                 .rpc_argp       = &arg,
3108                 .rpc_resp       = &res,
3109                 .rpc_cred       = state->owner->so_cred,
3110         };
3111         struct nfs4_lock_state *lsp;
3112         int status;
3113
3114         down_read(&clp->cl_sem);
3115         arg.lock_owner.clientid = clp->cl_clientid;
3116         status = nfs4_set_lock_state(state, request);
3117         if (status != 0)
3118                 goto out;
3119         lsp = request->fl_u.nfs4_fl.owner;
3120         arg.lock_owner.id = lsp->ls_id.id;
3121         status = rpc_call_sync(server->client, &msg, 0);
3122         switch (status) {
3123                 case 0:
3124                         request->fl_type = F_UNLCK;
3125                         break;
3126                 case -NFS4ERR_DENIED:
3127                         status = 0;
3128         }
3129         request->fl_ops->fl_release_private(request);
3130 out:
3131         up_read(&clp->cl_sem);
3132         return status;
3133 }
3134
3135 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3136 {
3137         struct nfs4_exception exception = { };
3138         int err;
3139
3140         do {
3141                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3142                                 _nfs4_proc_getlk(state, cmd, request),
3143                                 &exception);
3144         } while (exception.retry);
3145         return err;
3146 }
3147
3148 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3149 {
3150         int res = 0;
3151         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3152                 case FL_POSIX:
3153                         res = posix_lock_file_wait(file, fl);
3154                         break;
3155                 case FL_FLOCK:
3156                         res = flock_lock_file_wait(file, fl);
3157                         break;
3158                 default:
3159                         BUG();
3160         }
3161         return res;
3162 }
3163
3164 struct nfs4_unlockdata {
3165         struct nfs_locku_args arg;
3166         struct nfs_locku_res res;
3167         struct nfs4_lock_state *lsp;
3168         struct nfs_open_context *ctx;
3169         struct file_lock fl;
3170         const struct nfs_server *server;
3171         unsigned long timestamp;
3172 };
3173
3174 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3175                 struct nfs_open_context *ctx,
3176                 struct nfs4_lock_state *lsp,
3177                 struct nfs_seqid *seqid)
3178 {
3179         struct nfs4_unlockdata *p;
3180         struct inode *inode = lsp->ls_state->inode;
3181
3182         p = kmalloc(sizeof(*p), GFP_KERNEL);
3183         if (p == NULL)
3184                 return NULL;
3185         p->arg.fh = NFS_FH(inode);
3186         p->arg.fl = &p->fl;
3187         p->arg.seqid = seqid;
3188         p->arg.stateid = &lsp->ls_stateid;
3189         p->lsp = lsp;
3190         atomic_inc(&lsp->ls_count);
3191         /* Ensure we don't close file until we're done freeing locks! */
3192         p->ctx = get_nfs_open_context(ctx);
3193         memcpy(&p->fl, fl, sizeof(p->fl));
3194         p->server = NFS_SERVER(inode);
3195         return p;
3196 }
3197
3198 static void nfs4_locku_release_calldata(void *data)
3199 {
3200         struct nfs4_unlockdata *calldata = data;
3201         nfs_free_seqid(calldata->arg.seqid);
3202         nfs4_put_lock_state(calldata->lsp);
3203         put_nfs_open_context(calldata->ctx);
3204         kfree(calldata);
3205 }
3206
3207 static void nfs4_locku_done(struct rpc_task *task, void *data)
3208 {
3209         struct nfs4_unlockdata *calldata = data;
3210
3211         if (RPC_ASSASSINATED(task))
3212                 return;
3213         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3214         switch (task->tk_status) {
3215                 case 0:
3216                         memcpy(calldata->lsp->ls_stateid.data,
3217                                         calldata->res.stateid.data,
3218                                         sizeof(calldata->lsp->ls_stateid.data));
3219                         renew_lease(calldata->server, calldata->timestamp);
3220                         break;
3221                 case -NFS4ERR_STALE_STATEID:
3222                 case -NFS4ERR_EXPIRED:
3223                         break;
3224                 default:
3225                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3226                                 rpc_restart_call(task);
3227         }
3228 }
3229
3230 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3231 {
3232         struct nfs4_unlockdata *calldata = data;
3233         struct rpc_message msg = {
3234                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3235                 .rpc_argp       = &calldata->arg,
3236                 .rpc_resp       = &calldata->res,
3237                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3238         };
3239
3240         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3241                 return;
3242         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3243                 /* Note: exit _without_ running nfs4_locku_done */
3244                 task->tk_action = NULL;
3245                 return;
3246         }
3247         calldata->timestamp = jiffies;
3248         rpc_call_setup(task, &msg, 0);
3249 }
3250
3251 static const struct rpc_call_ops nfs4_locku_ops = {
3252         .rpc_call_prepare = nfs4_locku_prepare,
3253         .rpc_call_done = nfs4_locku_done,
3254         .rpc_release = nfs4_locku_release_calldata,
3255 };
3256
3257 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3258                 struct nfs_open_context *ctx,
3259                 struct nfs4_lock_state *lsp,
3260                 struct nfs_seqid *seqid)
3261 {
3262         struct nfs4_unlockdata *data;
3263
3264         /* Ensure this is an unlock - when canceling a lock, the
3265          * canceled lock is passed in, and it won't be an unlock.
3266          */
3267         fl->fl_type = F_UNLCK;
3268
3269         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3270         if (data == NULL) {
3271                 nfs_free_seqid(seqid);
3272                 return ERR_PTR(-ENOMEM);
3273         }
3274
3275         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3276 }
3277
3278 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3279 {
3280         struct nfs_seqid *seqid;
3281         struct nfs4_lock_state *lsp;
3282         struct rpc_task *task;
3283         int status = 0;
3284
3285         status = nfs4_set_lock_state(state, request);
3286         /* Unlock _before_ we do the RPC call */
3287         request->fl_flags |= FL_EXISTS;
3288         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3289                 goto out;
3290         if (status != 0)
3291                 goto out;
3292         /* Is this a delegated lock? */
3293         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3294                 goto out;
3295         lsp = request->fl_u.nfs4_fl.owner;
3296         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3297         status = -ENOMEM;
3298         if (seqid == NULL)
3299                 goto out;
3300         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3301         status = PTR_ERR(task);
3302         if (IS_ERR(task))
3303                 goto out;
3304         status = nfs4_wait_for_completion_rpc_task(task);
3305         rpc_put_task(task);
3306 out:
3307         return status;
3308 }
3309
3310 struct nfs4_lockdata {
3311         struct nfs_lock_args arg;
3312         struct nfs_lock_res res;
3313         struct nfs4_lock_state *lsp;
3314         struct nfs_open_context *ctx;
3315         struct file_lock fl;
3316         unsigned long timestamp;
3317         int rpc_status;
3318         int cancelled;
3319 };
3320
3321 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3322                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3323 {
3324         struct nfs4_lockdata *p;
3325         struct inode *inode = lsp->ls_state->inode;
3326         struct nfs_server *server = NFS_SERVER(inode);
3327
3328         p = kzalloc(sizeof(*p), GFP_KERNEL);
3329         if (p == NULL)
3330                 return NULL;
3331
3332         p->arg.fh = NFS_FH(inode);
3333         p->arg.fl = &p->fl;
3334         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
3335                 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3336                 if (p->arg.open_seqid == NULL)
3337                         goto out_free;
3338
3339         }
3340         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3341         if (p->arg.lock_seqid == NULL)
3342                 goto out_free;
3343         p->arg.lock_stateid = &lsp->ls_stateid;
3344         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3345         p->arg.lock_owner.id = lsp->ls_id.id;
3346         p->lsp = lsp;
3347         atomic_inc(&lsp->ls_count);
3348         p->ctx = get_nfs_open_context(ctx);
3349         memcpy(&p->fl, fl, sizeof(p->fl));
3350         return p;
3351 out_free:
3352         if (p->arg.open_seqid != NULL)
3353                 nfs_free_seqid(p->arg.open_seqid);
3354         kfree(p);
3355         return NULL;
3356 }
3357
3358 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3359 {
3360         struct nfs4_lockdata *data = calldata;
3361         struct nfs4_state *state = data->lsp->ls_state;
3362         struct nfs4_state_owner *sp = state->owner;
3363         struct rpc_message msg = {
3364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3365                 .rpc_argp = &data->arg,
3366                 .rpc_resp = &data->res,
3367                 .rpc_cred = sp->so_cred,
3368         };
3369
3370         dprintk("%s: begin!\n", __FUNCTION__);
3371         /* Do we need to do an open_to_lock_owner? */
3372         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3373                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3374                         return;
3375                 data->arg.open_stateid = &state->stateid;
3376                 data->arg.new_lock_owner = 1;
3377                 /* Retest in case we raced... */
3378                 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED))
3379                         goto do_rpc;
3380         }
3381         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3382                 return;
3383         data->arg.new_lock_owner = 0;
3384 do_rpc:
3385         data->timestamp = jiffies;
3386         rpc_call_setup(task, &msg, 0);
3387         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3388 }
3389
3390 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3391 {
3392         struct nfs4_lockdata *data = calldata;
3393
3394         dprintk("%s: begin!\n", __FUNCTION__);
3395
3396         data->rpc_status = task->tk_status;
3397         if (RPC_ASSASSINATED(task))
3398                 goto out;
3399         if (data->arg.new_lock_owner != 0) {
3400                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3401                 if (data->rpc_status == 0)
3402                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3403                 else
3404                         goto out;
3405         }
3406         if (data->rpc_status == 0) {
3407                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3408                                         sizeof(data->lsp->ls_stateid.data));
3409                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3410                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3411         }
3412         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3413 out:
3414         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3415 }
3416
3417 static void nfs4_lock_release(void *calldata)
3418 {
3419         struct nfs4_lockdata *data = calldata;
3420
3421         dprintk("%s: begin!\n", __FUNCTION__);
3422         if (data->cancelled != 0) {
3423                 struct rpc_task *task;
3424                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3425                                 data->arg.lock_seqid);
3426                 if (!IS_ERR(task))
3427                         rpc_put_task(task);
3428                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3429         } else
3430                 nfs_free_seqid(data->arg.lock_seqid);
3431         if (data->arg.open_seqid != NULL)
3432                 nfs_free_seqid(data->arg.open_seqid);
3433         nfs4_put_lock_state(data->lsp);
3434         put_nfs_open_context(data->ctx);
3435         kfree(data);
3436         dprintk("%s: done!\n", __FUNCTION__);
3437 }
3438
3439 static const struct rpc_call_ops nfs4_lock_ops = {
3440         .rpc_call_prepare = nfs4_lock_prepare,
3441         .rpc_call_done = nfs4_lock_done,
3442         .rpc_release = nfs4_lock_release,
3443 };
3444
3445 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3446 {
3447         struct nfs4_lockdata *data;
3448         struct rpc_task *task;
3449         int ret;
3450
3451         dprintk("%s: begin!\n", __FUNCTION__);
3452         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3453                         fl->fl_u.nfs4_fl.owner);
3454         if (data == NULL)
3455                 return -ENOMEM;
3456         if (IS_SETLKW(cmd))
3457                 data->arg.block = 1;
3458         if (reclaim != 0)
3459                 data->arg.reclaim = 1;
3460         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3461                         &nfs4_lock_ops, data);
3462         if (IS_ERR(task))
3463                 return PTR_ERR(task);
3464         ret = nfs4_wait_for_completion_rpc_task(task);
3465         if (ret == 0) {
3466                 ret = data->rpc_status;
3467                 if (ret == -NFS4ERR_DENIED)
3468                         ret = -EAGAIN;
3469         } else
3470                 data->cancelled = 1;
3471         rpc_put_task(task);
3472         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3473         return ret;
3474 }
3475
3476 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3477 {
3478         struct nfs_server *server = NFS_SERVER(state->inode);
3479         struct nfs4_exception exception = { };
3480         int err;
3481
3482         do {
3483                 /* Cache the lock if possible... */
3484                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3485                         return 0;
3486                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3487                 if (err != -NFS4ERR_DELAY)
3488                         break;
3489                 nfs4_handle_exception(server, err, &exception);
3490         } while (exception.retry);
3491         return err;
3492 }
3493
3494 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3495 {
3496         struct nfs_server *server = NFS_SERVER(state->inode);
3497         struct nfs4_exception exception = { };
3498         int err;
3499
3500         err = nfs4_set_lock_state(state, request);
3501         if (err != 0)
3502                 return err;
3503         do {
3504                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3505                         return 0;
3506                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3507                 if (err != -NFS4ERR_DELAY)
3508                         break;
3509                 nfs4_handle_exception(server, err, &exception);
3510         } while (exception.retry);
3511         return err;
3512 }
3513
3514 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3515 {
3516         struct nfs_client *clp = state->owner->so_client;
3517         unsigned char fl_flags = request->fl_flags;
3518         int status;
3519
3520         /* Is this a delegated open? */
3521         status = nfs4_set_lock_state(state, request);
3522         if (status != 0)
3523                 goto out;
3524         request->fl_flags |= FL_ACCESS;
3525         status = do_vfs_lock(request->fl_file, request);
3526         if (status < 0)
3527                 goto out;
3528         down_read(&clp->cl_sem);
3529         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3530                 struct nfs_inode *nfsi = NFS_I(state->inode);
3531                 /* Yes: cache locks! */
3532                 down_read(&nfsi->rwsem);
3533                 /* ...but avoid races with delegation recall... */
3534                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3535                         request->fl_flags = fl_flags & ~FL_SLEEP;
3536                         status = do_vfs_lock(request->fl_file, request);
3537                         up_read(&nfsi->rwsem);
3538                         goto out_unlock;
3539                 }
3540                 up_read(&nfsi->rwsem);
3541         }
3542         status = _nfs4_do_setlk(state, cmd, request, 0);
3543         if (status != 0)
3544                 goto out_unlock;
3545         /* Note: we always want to sleep here! */
3546         request->fl_flags = fl_flags | FL_SLEEP;
3547         if (do_vfs_lock(request->fl_file, request) < 0)
3548                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3549 out_unlock:
3550         up_read(&clp->cl_sem);
3551 out:
3552         request->fl_flags = fl_flags;
3553         return status;
3554 }
3555
3556 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3557 {
3558         struct nfs4_exception exception = { };
3559         int err;
3560
3561         do {
3562                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3563                                 _nfs4_proc_setlk(state, cmd, request),
3564                                 &exception);
3565         } while (exception.retry);
3566         return err;
3567 }
3568
3569 static int
3570 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3571 {
3572         struct nfs_open_context *ctx;
3573         struct nfs4_state *state;
3574         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3575         int status;
3576
3577         /* verify open state */
3578         ctx = nfs_file_open_context(filp);
3579         state = ctx->state;
3580
3581         if (request->fl_start < 0 || request->fl_end < 0)
3582                 return -EINVAL;
3583
3584         if (IS_GETLK(cmd))
3585                 return nfs4_proc_getlk(state, F_GETLK, request);
3586
3587         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3588                 return -EINVAL;
3589
3590         if (request->fl_type == F_UNLCK)
3591                 return nfs4_proc_unlck(state, cmd, request);
3592
3593         do {
3594                 status = nfs4_proc_setlk(state, cmd, request);
3595                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3596                         break;
3597                 timeout = nfs4_set_lock_task_retry(timeout);
3598                 status = -ERESTARTSYS;
3599                 if (signalled())
3600                         break;
3601         } while(status < 0);
3602         return status;
3603 }
3604
3605 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3606 {
3607         struct nfs_server *server = NFS_SERVER(state->inode);
3608         struct nfs4_exception exception = { };
3609         int err;
3610
3611         err = nfs4_set_lock_state(state, fl);
3612         if (err != 0)
3613                 goto out;
3614         do {
3615                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3616                 if (err != -NFS4ERR_DELAY)
3617                         break;
3618                 err = nfs4_handle_exception(server, err, &exception);
3619         } while (exception.retry);
3620 out:
3621         return err;
3622 }
3623
3624 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3625
3626 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3627                 size_t buflen, int flags)
3628 {
3629         struct inode *inode = dentry->d_inode;
3630
3631         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3632                 return -EOPNOTSUPP;
3633
3634         if (!S_ISREG(inode->i_mode) &&
3635             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3636                 return -EPERM;
3637
3638         return nfs4_proc_set_acl(inode, buf, buflen);
3639 }
3640
3641 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3642  * and that's what we'll do for e.g. user attributes that haven't been set.
3643  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3644  * attributes in kernel-managed attribute namespaces. */
3645 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3646                 size_t buflen)
3647 {
3648         struct inode *inode = dentry->d_inode;
3649
3650         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3651                 return -EOPNOTSUPP;
3652
3653         return nfs4_proc_get_acl(inode, buf, buflen);
3654 }
3655
3656 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3657 {
3658         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3659
3660         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3661                 return 0;
3662         if (buf && buflen < len)
3663                 return -ERANGE;
3664         if (buf)
3665                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3666         return len;
3667 }
3668
3669 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3670                 struct nfs4_fs_locations *fs_locations, struct page *page)
3671 {
3672         struct nfs_server *server = NFS_SERVER(dir);
3673         u32 bitmask[2] = {
3674                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3675                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3676         };
3677         struct nfs4_fs_locations_arg args = {
3678                 .dir_fh = NFS_FH(dir),
3679                 .name = name,
3680                 .page = page,
3681                 .bitmask = bitmask,
3682         };
3683         struct rpc_message msg = {
3684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3685                 .rpc_argp = &args,
3686                 .rpc_resp = fs_locations,
3687         };
3688         int status;
3689
3690         dprintk("%s: start\n", __FUNCTION__);
3691         nfs_fattr_init(&fs_locations->fattr);
3692         fs_locations->server = server;
3693         fs_locations->nlocations = 0;
3694         status = rpc_call_sync(server->client, &msg, 0);
3695         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3696         return status;
3697 }
3698
3699 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3700         .recover_open   = nfs4_open_reclaim,
3701         .recover_lock   = nfs4_lock_reclaim,
3702 };
3703
3704 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3705         .recover_open   = nfs4_open_expired,
3706         .recover_lock   = nfs4_lock_expired,
3707 };
3708
3709 static const struct inode_operations nfs4_file_inode_operations = {
3710         .permission     = nfs_permission,
3711         .getattr        = nfs_getattr,
3712         .setattr        = nfs_setattr,
3713         .getxattr       = nfs4_getxattr,
3714         .setxattr       = nfs4_setxattr,
3715         .listxattr      = nfs4_listxattr,
3716 };
3717
3718 const struct nfs_rpc_ops nfs_v4_clientops = {
3719         .version        = 4,                    /* protocol version */
3720         .dentry_ops     = &nfs4_dentry_operations,
3721         .dir_inode_ops  = &nfs4_dir_inode_operations,
3722         .file_inode_ops = &nfs4_file_inode_operations,
3723         .getroot        = nfs4_proc_get_root,
3724         .getattr        = nfs4_proc_getattr,
3725         .setattr        = nfs4_proc_setattr,
3726         .lookupfh       = nfs4_proc_lookupfh,
3727         .lookup         = nfs4_proc_lookup,
3728         .access         = nfs4_proc_access,
3729         .readlink       = nfs4_proc_readlink,
3730         .create         = nfs4_proc_create,
3731         .remove         = nfs4_proc_remove,
3732         .unlink_setup   = nfs4_proc_unlink_setup,
3733         .unlink_done    = nfs4_proc_unlink_done,
3734         .rename         = nfs4_proc_rename,
3735         .link           = nfs4_proc_link,
3736         .symlink        = nfs4_proc_symlink,
3737         .mkdir          = nfs4_proc_mkdir,
3738         .rmdir          = nfs4_proc_remove,
3739         .readdir        = nfs4_proc_readdir,
3740         .mknod          = nfs4_proc_mknod,
3741         .statfs         = nfs4_proc_statfs,
3742         .fsinfo         = nfs4_proc_fsinfo,
3743         .pathconf       = nfs4_proc_pathconf,
3744         .set_capabilities = nfs4_server_capabilities,
3745         .decode_dirent  = nfs4_decode_dirent,
3746         .read_setup     = nfs4_proc_read_setup,
3747         .read_done      = nfs4_read_done,
3748         .write_setup    = nfs4_proc_write_setup,
3749         .write_done     = nfs4_write_done,
3750         .commit_setup   = nfs4_proc_commit_setup,
3751         .commit_done    = nfs4_commit_done,
3752         .file_open      = nfs_open,
3753         .file_release   = nfs_release,
3754         .lock           = nfs4_proc_lock,
3755         .clear_acl_cache = nfs4_zap_acl_attr,
3756 };
3757
3758 /*
3759  * Local variables:
3760  *  c-basic-offset: 8
3761  * End:
3762  */