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                 renew_lease(data->o_res.server, data->timestamp);
 745                 data->rpc_done = 1;
 746         }
 747         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 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         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 763         state = nfs4_opendata_to_nfs4_state(data);
 764         if (!IS_ERR(state))
 765                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 766 out_free:
 767         nfs4_opendata_put(data);
 768 }
 769
 770 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 771         .rpc_call_prepare = nfs4_open_confirm_prepare,
 772         .rpc_call_done = nfs4_open_confirm_done,
 773         .rpc_release = nfs4_open_confirm_release,
 774 };
 775
 776 /*
 777  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 778  */
 779 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 780 {
 781         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 782         struct rpc_task *task;
 783         int status;
 784
 785         kref_get(&data->kref);
 786         data->rpc_done = 0;
 787         data->rpc_status = 0;
 788         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 789         if (IS_ERR(task))
 790                 return PTR_ERR(task);
 791         status = nfs4_wait_for_completion_rpc_task(task);
 792         if (status != 0) {
 793                 data->cancelled = 1;
 794                 smp_wmb();
 795         } else
 796                 status = data->rpc_status;
 797         rpc_put_task(task);
 798         return status;
 799 }
 800
 801 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 802 {
 803         struct nfs4_opendata *data = calldata;
 804         struct nfs4_state_owner *sp = data->owner;
 805         struct rpc_message msg = {
 806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 807                 .rpc_argp = &data->o_arg,
 808                 .rpc_resp = &data->o_res,
 809                 .rpc_cred = sp->so_cred,
 810         };
 811
 812         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 813                 return;
 814         /*
 815          * Check if we still need to send an OPEN call, or if we can use
 816          * a delegation instead.
 817          */
 818         if (data->state != NULL) {
 819                 struct nfs_delegation *delegation;
 820
 821                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 822                         goto out_no_action;
 823                 rcu_read_lock();
 824                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 825                 if (delegation != NULL &&
 826                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 827                         rcu_read_unlock();
 828                         goto out_no_action;
 829                 }
 830                 rcu_read_unlock();
 831         }
 832         /* Update sequence id. */
 833         data->o_arg.id = sp->so_owner_id.id;
 834         data->o_arg.clientid = sp->so_client->cl_clientid;
 835         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 836                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 837                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 838         }
 839         data->timestamp = jiffies;
 840         rpc_call_setup(task, &msg, 0);
 841         return;
 842 out_no_action:
 843         task->tk_action = NULL;
 844
 845 }
 846
 847 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 848 {
 849         struct nfs4_opendata *data = calldata;
 850
 851         data->rpc_status = task->tk_status;
 852         if (RPC_ASSASSINATED(task))
 853                 return;
 854         if (task->tk_status == 0) {
 855                 switch (data->o_res.f_attr->mode & S_IFMT) {
 856                         case S_IFREG:
 857                                 break;
 858                         case S_IFLNK:
 859                                 data->rpc_status = -ELOOP;
 860                                 break;
 861                         case S_IFDIR:
 862                                 data->rpc_status = -EISDIR;
 863                                 break;
 864                         default:
 865                                 data->rpc_status = -ENOTDIR;
 866                 }
 867                 renew_lease(data->o_res.server, data->timestamp);
 868                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 869                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 870         }
 871         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 872         data->rpc_done = 1;
 873 }
 874
 875 static void nfs4_open_release(void *calldata)
 876 {
 877         struct nfs4_opendata *data = calldata;
 878         struct nfs4_state *state = NULL;
 879
 880         /* If this request hasn't been cancelled, do nothing */
 881         if (data->cancelled == 0)
 882                 goto out_free;
 883         /* In case of error, no cleanup! */
 884         if (data->rpc_status != 0 || !data->rpc_done)
 885                 goto out_free;
 886         /* In case we need an open_confirm, no cleanup! */
 887         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 888                 goto out_free;
 889         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 890         state = nfs4_opendata_to_nfs4_state(data);
 891         if (!IS_ERR(state))
 892                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 893 out_free:
 894         nfs4_opendata_put(data);
 895 }
 896
 897 static const struct rpc_call_ops nfs4_open_ops = {
 898         .rpc_call_prepare = nfs4_open_prepare,
 899         .rpc_call_done = nfs4_open_done,
 900         .rpc_release = nfs4_open_release,
 901 };
 902
 903 /*
 904  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 905  */
 906 static int _nfs4_proc_open(struct nfs4_opendata *data)
 907 {
 908         struct inode *dir = data->dir->d_inode;
 909         struct nfs_server *server = NFS_SERVER(dir);
 910         struct nfs_openargs *o_arg = &data->o_arg;
 911         struct nfs_openres *o_res = &data->o_res;
 912         struct rpc_task *task;
 913         int status;
 914
 915         kref_get(&data->kref);
 916         data->rpc_done = 0;
 917         data->rpc_status = 0;
 918         data->cancelled = 0;
 919         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 920         if (IS_ERR(task))
 921                 return PTR_ERR(task);
 922         status = nfs4_wait_for_completion_rpc_task(task);
 923         if (status != 0) {
 924                 data->cancelled = 1;
 925                 smp_wmb();
 926         } else
 927                 status = data->rpc_status;
 928         rpc_put_task(task);
 929         if (status != 0 || !data->rpc_done)
 930                 return status;
 931
 932         if (o_res->fh.size == 0)
 933                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 934
 935         if (o_arg->open_flags & O_CREAT) {
 936                 update_changeattr(dir, &o_res->cinfo);
 937                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 938         } else
 939                 nfs_refresh_inode(dir, o_res->dir_attr);
 940         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 941                 status = _nfs4_proc_open_confirm(data);
 942                 if (status != 0)
 943                         return status;
 944         }
 945         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 946                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 947         return 0;
 948 }
 949
 950 static int nfs4_recover_expired_lease(struct nfs_server *server)
 951 {
 952         struct nfs_client *clp = server->nfs_client;
 953         int ret;
 954
 955         for (;;) {
 956                 ret = nfs4_wait_clnt_recover(server->client, clp);
 957                 if (ret != 0)
 958                         return ret;
 959                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 960                         break;
 961                 nfs4_schedule_state_recovery(clp);
 962         }
 963         return 0;
 964 }
 965
 966 /*
 967  * OPEN_EXPIRED:
 968  *      reclaim state on the server after a network partition.
 969  *      Assumes caller holds the appropriate lock
 970  */
 971 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 972 {
 973         struct nfs4_opendata *opendata;
 974         int ret;
 975
 976         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 977         if (IS_ERR(opendata))
 978                 return PTR_ERR(opendata);
 979         ret = nfs4_open_recover(opendata, state);
 980         if (ret == -ESTALE) {
 981                 /* Invalidate the state owner so we don't ever use it again */
 982                 nfs4_drop_state_owner(state->owner);
 983                 d_drop(ctx->path.dentry);
 984         }
 985         nfs4_opendata_put(opendata);
 986         return ret;
 987 }
 988
 989 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 990 {
 991         struct nfs_server *server = NFS_SERVER(state->inode);
 992         struct nfs4_exception exception = { };
 993         int err;
 994
 995         do {
 996                 err = _nfs4_open_expired(ctx, state);
 997                 if (err == -NFS4ERR_DELAY)
 998                         nfs4_handle_exception(server, err, &exception);
 999         } while (exception.retry);
1000         return err;
1001 }
1002
1003 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1004 {
1005         struct nfs_open_context *ctx;
1006         int ret;
1007
1008         ctx = nfs4_state_find_open_context(state);
1009         if (IS_ERR(ctx))
1010                 return PTR_ERR(ctx);
1011         ret = nfs4_do_open_expired(ctx, state);
1012         put_nfs_open_context(ctx);
1013         return ret;
1014 }
1015
1016 /*
1017  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1018  * fields corresponding to attributes that were used to store the verifier.
1019  * Make sure we clobber those fields in the later setattr call
1020  */
1021 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1022 {
1023         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1024             !(sattr->ia_valid & ATTR_ATIME_SET))
1025                 sattr->ia_valid |= ATTR_ATIME;
1026
1027         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1028             !(sattr->ia_valid & ATTR_MTIME_SET))
1029                 sattr->ia_valid |= ATTR_MTIME;
1030 }
1031
1032 /*
1033  * Returns a referenced nfs4_state
1034  */
1035 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1036 {
1037         struct nfs4_state_owner  *sp;
1038         struct nfs4_state     *state = NULL;
1039         struct nfs_server       *server = NFS_SERVER(dir);
1040         struct nfs_client *clp = server->nfs_client;
1041         struct nfs4_opendata *opendata;
1042         int status;
1043
1044         /* Protect against reboot recovery conflicts */
1045         status = -ENOMEM;
1046         if (!(sp = nfs4_get_state_owner(server, cred))) {
1047                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1048                 goto out_err;
1049         }
1050         status = nfs4_recover_expired_lease(server);
1051         if (status != 0)
1052                 goto err_put_state_owner;
1053         if (path->dentry->d_inode != NULL)
1054                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1055         down_read(&clp->cl_sem);
1056         status = -ENOMEM;
1057         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1058         if (opendata == NULL)
1059                 goto err_release_rwsem;
1060
1061         if (path->dentry->d_inode != NULL)
1062                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1063
1064         status = _nfs4_proc_open(opendata);
1065         if (status != 0)
1066                 goto err_opendata_put;
1067
1068         if (opendata->o_arg.open_flags & O_EXCL)
1069                 nfs4_exclusive_attrset(opendata, sattr);
1070
1071         state = nfs4_opendata_to_nfs4_state(opendata);
1072         status = PTR_ERR(state);
1073         if (IS_ERR(state))
1074                 goto err_opendata_put;
1075         nfs4_opendata_put(opendata);
1076         nfs4_put_state_owner(sp);
1077         up_read(&clp->cl_sem);
1078         *res = state;
1079         return 0;
1080 err_opendata_put:
1081         nfs4_opendata_put(opendata);
1082 err_release_rwsem:
1083         up_read(&clp->cl_sem);
1084 err_put_state_owner:
1085         nfs4_put_state_owner(sp);
1086 out_err:
1087         *res = NULL;
1088         return status;
1089 }
1090
1091
1092 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1093 {
1094         struct nfs4_exception exception = { };
1095         struct nfs4_state *res;
1096         int status;
1097
1098         do {
1099                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1100                 if (status == 0)
1101                         break;
1102                 /* NOTE: BAD_SEQID means the server and client disagree about the
1103                  * book-keeping w.r.t. state-changing operations
1104                  * (OPEN/CLOSE/LOCK/LOCKU...)
1105                  * It is actually a sign of a bug on the client or on the server.
1106                  *
1107                  * If we receive a BAD_SEQID error in the particular case of
1108                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1109                  * have unhashed the old state_owner for us, and that we can
1110                  * therefore safely retry using a new one. We should still warn
1111                  * the user though...
1112                  */
1113                 if (status == -NFS4ERR_BAD_SEQID) {
1114                         printk(KERN_WARNING "NFS: v4 server %s "
1115                                         " returned a bad sequence-id error!\n",
1116                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1117                         exception.retry = 1;
1118                         continue;
1119                 }
1120                 /*
1121                  * BAD_STATEID on OPEN means that the server cancelled our
1122                  * state before it received the OPEN_CONFIRM.
1123                  * Recover by retrying the request as per the discussion
1124                  * on Page 181 of RFC3530.
1125                  */
1126                 if (status == -NFS4ERR_BAD_STATEID) {
1127                         exception.retry = 1;
1128                         continue;
1129                 }
1130                 if (status == -EAGAIN) {
1131                         /* We must have found a delegation */
1132                         exception.retry = 1;
1133                         continue;
1134                 }
1135                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1136                                         status, &exception));
1137         } while (exception.retry);
1138         return res;
1139 }
1140
1141 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1142                 struct iattr *sattr, struct nfs4_state *state)
1143 {
1144         struct nfs_server *server = NFS_SERVER(inode);
1145         struct nfs_setattrargs  arg = {
1146                 .fh             = NFS_FH(inode),
1147                 .iap            = sattr,
1148                 .server         = server,
1149                 .bitmask = server->attr_bitmask,
1150         };
1151         struct nfs_setattrres  res = {
1152                 .fattr          = fattr,
1153                 .server         = server,
1154         };
1155         struct rpc_message msg = {
1156                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1157                 .rpc_argp       = &arg,
1158                 .rpc_resp       = &res,
1159         };
1160         unsigned long timestamp = jiffies;
1161         int status;
1162
1163         nfs_fattr_init(fattr);
1164
1165         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1166                 /* Use that stateid */
1167         } else if (state != NULL) {
1168                 msg.rpc_cred = state->owner->so_cred;
1169                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1170         } else
1171                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1172
1173         status = rpc_call_sync(server->client, &msg, 0);
1174         if (status == 0 && state != NULL)
1175                 renew_lease(server, timestamp);
1176         return status;
1177 }
1178
1179 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1180                 struct iattr *sattr, struct nfs4_state *state)
1181 {
1182         struct nfs_server *server = NFS_SERVER(inode);
1183         struct nfs4_exception exception = { };
1184         int err;
1185         do {
1186                 err = nfs4_handle_exception(server,
1187                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1188                                 &exception);
1189         } while (exception.retry);
1190         return err;
1191 }
1192
1193 struct nfs4_closedata {
1194         struct path path;
1195         struct inode *inode;
1196         struct nfs4_state *state;
1197         struct nfs_closeargs arg;
1198         struct nfs_closeres res;
1199         struct nfs_fattr fattr;
1200         unsigned long timestamp;
1201 };
1202
1203 static void nfs4_free_closedata(void *data)
1204 {
1205         struct nfs4_closedata *calldata = data;
1206         struct nfs4_state_owner *sp = calldata->state->owner;
1207
1208         nfs4_put_open_state(calldata->state);
1209         nfs_free_seqid(calldata->arg.seqid);
1210         nfs4_put_state_owner(sp);
1211         dput(calldata->path.dentry);
1212         mntput(calldata->path.mnt);
1213         kfree(calldata);
1214 }
1215
1216 static void nfs4_close_done(struct rpc_task *task, void *data)
1217 {
1218         struct nfs4_closedata *calldata = data;
1219         struct nfs4_state *state = calldata->state;
1220         struct nfs_server *server = NFS_SERVER(calldata->inode);
1221
1222         if (RPC_ASSASSINATED(task))
1223                 return;
1224         /* hmm. we are done with the inode, and in the process of freeing
1225          * the state_owner. we keep this around to process errors
1226          */
1227         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1228         switch (task->tk_status) {
1229                 case 0:
1230                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1231                         renew_lease(server, calldata->timestamp);
1232                         break;
1233                 case -NFS4ERR_STALE_STATEID:
1234                 case -NFS4ERR_EXPIRED:
1235                         break;
1236                 default:
1237                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1238                                 rpc_restart_call(task);
1239                                 return;
1240                         }
1241         }
1242         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1243 }
1244
1245 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1246 {
1247         struct nfs4_closedata *calldata = data;
1248         struct nfs4_state *state = calldata->state;
1249         struct rpc_message msg = {
1250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1251                 .rpc_argp = &calldata->arg,
1252                 .rpc_resp = &calldata->res,
1253                 .rpc_cred = state->owner->so_cred,
1254         };
1255         int clear_rd, clear_wr, clear_rdwr;
1256
1257         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1258                 return;
1259
1260         clear_rd = clear_wr = clear_rdwr = 0;
1261         spin_lock(&state->owner->so_lock);
1262         /* Calculate the change in open mode */
1263         if (state->n_rdwr == 0) {
1264                 if (state->n_rdonly == 0) {
1265                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1266                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1267                 }
1268                 if (state->n_wronly == 0) {
1269                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1270                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1271                 }
1272         }
1273         spin_unlock(&state->owner->so_lock);
1274         if (!clear_rd && !clear_wr && !clear_rdwr) {
1275                 /* Note: exit _without_ calling nfs4_close_done */
1276                 task->tk_action = NULL;
1277                 return;
1278         }
1279         nfs_fattr_init(calldata->res.fattr);
1280         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1281                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1282                 calldata->arg.open_flags = FMODE_READ;
1283         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1284                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1285                 calldata->arg.open_flags = FMODE_WRITE;
1286         }
1287         calldata->timestamp = jiffies;
1288         rpc_call_setup(task, &msg, 0);
1289 }
1290
1291 static const struct rpc_call_ops nfs4_close_ops = {
1292         .rpc_call_prepare = nfs4_close_prepare,
1293         .rpc_call_done = nfs4_close_done,
1294         .rpc_release = nfs4_free_closedata,
1295 };
1296
1297 /*
1298  * It is possible for data to be read/written from a mem-mapped file
1299  * after the sys_close call (which hits the vfs layer as a flush).
1300  * This means that we can't safely call nfsv4 close on a file until
1301  * the inode is cleared. This in turn means that we are not good
1302  * NFSv4 citizens - we do not indicate to the server to update the file's
1303  * share state even when we are done with one of the three share
1304  * stateid's in the inode.
1305  *
1306  * NOTE: Caller must be holding the sp->so_owner semaphore!
1307  */
1308 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1309 {
1310         struct nfs_server *server = NFS_SERVER(state->inode);
1311         struct nfs4_closedata *calldata;
1312         struct nfs4_state_owner *sp = state->owner;
1313         struct rpc_task *task;
1314         int status = -ENOMEM;
1315
1316         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1317         if (calldata == NULL)
1318                 goto out;
1319         calldata->inode = state->inode;
1320         calldata->state = state;
1321         calldata->arg.fh = NFS_FH(state->inode);
1322         calldata->arg.stateid = &state->open_stateid;
1323         /* Serialization for the sequence id */
1324         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1325         if (calldata->arg.seqid == NULL)
1326                 goto out_free_calldata;
1327         calldata->arg.bitmask = server->attr_bitmask;
1328         calldata->res.fattr = &calldata->fattr;
1329         calldata->res.server = server;
1330         calldata->path.mnt = mntget(path->mnt);
1331         calldata->path.dentry = dget(path->dentry);
1332
1333         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1334         if (IS_ERR(task))
1335                 return PTR_ERR(task);
1336         rpc_put_task(task);
1337         return 0;
1338 out_free_calldata:
1339         kfree(calldata);
1340 out:
1341         nfs4_put_open_state(state);
1342         nfs4_put_state_owner(sp);
1343         return status;
1344 }
1345
1346 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1347 {
1348         struct file *filp;
1349         int ret;
1350
1351         /* If the open_intent is for execute, we have an extra check to make */
1352         if (nd->intent.open.flags & FMODE_EXEC) {
1353                 ret = nfs_may_open(state->inode,
1354                                 state->owner->so_cred,
1355                                 nd->intent.open.flags);
1356                 if (ret < 0)
1357                         goto out_close;
1358         }
1359         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1360         if (!IS_ERR(filp)) {
1361                 struct nfs_open_context *ctx;
1362                 ctx = nfs_file_open_context(filp);
1363                 ctx->state = state;
1364                 return 0;
1365         }
1366         ret = PTR_ERR(filp);
1367 out_close:
1368         nfs4_close_state(path, state, nd->intent.open.flags);
1369         return ret;
1370 }
1371
1372 struct dentry *
1373 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1374 {
1375         struct path path = {
1376                 .mnt = nd->mnt,
1377                 .dentry = dentry,
1378         };
1379         struct iattr attr;
1380         struct rpc_cred *cred;
1381         struct nfs4_state *state;
1382         struct dentry *res;
1383
1384         if (nd->flags & LOOKUP_CREATE) {
1385                 attr.ia_mode = nd->intent.open.create_mode;
1386                 attr.ia_valid = ATTR_MODE;
1387                 if (!IS_POSIXACL(dir))
1388                         attr.ia_mode &= ~current->fs->umask;
1389         } else {
1390                 attr.ia_valid = 0;
1391                 BUG_ON(nd->intent.open.flags & O_CREAT);
1392         }
1393
1394         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1395         if (IS_ERR(cred))
1396                 return (struct dentry *)cred;
1397         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1398         put_rpccred(cred);
1399         if (IS_ERR(state)) {
1400                 if (PTR_ERR(state) == -ENOENT) {
1401                         d_add(dentry, NULL);
1402                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1403                 }
1404                 return (struct dentry *)state;
1405         }
1406         res = d_add_unique(dentry, igrab(state->inode));
1407         if (res != NULL)
1408                 path.dentry = res;
1409         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1410         nfs4_intent_set_file(nd, &path, state);
1411         return res;
1412 }
1413
1414 int
1415 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1416 {
1417         struct path path = {
1418                 .mnt = nd->mnt,
1419                 .dentry = dentry,
1420         };
1421         struct rpc_cred *cred;
1422         struct nfs4_state *state;
1423
1424         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1425         if (IS_ERR(cred))
1426                 return PTR_ERR(cred);
1427         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1428         put_rpccred(cred);
1429         if (IS_ERR(state)) {
1430                 switch (PTR_ERR(state)) {
1431                         case -EPERM:
1432                         case -EACCES:
1433                         case -EDQUOT:
1434                         case -ENOSPC:
1435                         case -EROFS:
1436                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1437                                 return 1;
1438                         default:
1439                                 goto out_drop;
1440                 }
1441         }
1442         if (state->inode == dentry->d_inode) {
1443                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1444                 nfs4_intent_set_file(nd, &path, state);
1445                 return 1;
1446         }
1447         nfs4_close_state(&path, state, openflags);
1448 out_drop:
1449         d_drop(dentry);
1450         return 0;
1451 }
1452
1453
1454 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1455 {
1456         struct nfs4_server_caps_res res = {};
1457         struct rpc_message msg = {
1458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1459                 .rpc_argp = fhandle,
1460                 .rpc_resp = &res,
1461         };
1462         int status;
1463
1464         status = rpc_call_sync(server->client, &msg, 0);
1465         if (status == 0) {
1466                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1467                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1468                         server->caps |= NFS_CAP_ACLS;
1469                 if (res.has_links != 0)
1470                         server->caps |= NFS_CAP_HARDLINKS;
1471                 if (res.has_symlinks != 0)
1472                         server->caps |= NFS_CAP_SYMLINKS;
1473                 server->acl_bitmask = res.acl_bitmask;
1474         }
1475         return status;
1476 }
1477
1478 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1479 {
1480         struct nfs4_exception exception = { };
1481         int err;
1482         do {
1483                 err = nfs4_handle_exception(server,
1484                                 _nfs4_server_capabilities(server, fhandle),
1485                                 &exception);
1486         } while (exception.retry);
1487         return err;
1488 }
1489
1490 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1491                 struct nfs_fsinfo *info)
1492 {
1493         struct nfs4_lookup_root_arg args = {
1494                 .bitmask = nfs4_fattr_bitmap,
1495         };
1496         struct nfs4_lookup_res res = {
1497                 .server = server,
1498                 .fattr = info->fattr,
1499                 .fh = fhandle,
1500         };
1501         struct rpc_message msg = {
1502                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1503                 .rpc_argp = &args,
1504                 .rpc_resp = &res,
1505         };
1506         nfs_fattr_init(info->fattr);
1507         return rpc_call_sync(server->client, &msg, 0);
1508 }
1509
1510 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1511                 struct nfs_fsinfo *info)
1512 {
1513         struct nfs4_exception exception = { };
1514         int err;
1515         do {
1516                 err = nfs4_handle_exception(server,
1517                                 _nfs4_lookup_root(server, fhandle, info),
1518                                 &exception);
1519         } while (exception.retry);
1520         return err;
1521 }
1522
1523 /*
1524  * get the file handle for the "/" directory on the server
1525  */
1526 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1527                               struct nfs_fsinfo *info)
1528 {
1529         int status;
1530
1531         status = nfs4_lookup_root(server, fhandle, info);
1532         if (status == 0)
1533                 status = nfs4_server_capabilities(server, fhandle);
1534         if (status == 0)
1535                 status = nfs4_do_fsinfo(server, fhandle, info);
1536         return nfs4_map_errors(status);
1537 }
1538
1539 /*
1540  * Get locations and (maybe) other attributes of a referral.
1541  * Note that we'll actually follow the referral later when
1542  * we detect fsid mismatch in inode revalidation
1543  */
1544 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1545 {
1546         int status = -ENOMEM;
1547         struct page *page = NULL;
1548         struct nfs4_fs_locations *locations = NULL;
1549
1550         page = alloc_page(GFP_KERNEL);
1551         if (page == NULL)
1552                 goto out;
1553         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1554         if (locations == NULL)
1555                 goto out;
1556
1557         status = nfs4_proc_fs_locations(dir, name, locations, page);
1558         if (status != 0)
1559                 goto out;
1560         /* Make sure server returned a different fsid for the referral */
1561         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1562                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1563                 status = -EIO;
1564                 goto out;
1565         }
1566
1567         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1568         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1569         if (!fattr->mode)
1570                 fattr->mode = S_IFDIR;
1571         memset(fhandle, 0, sizeof(struct nfs_fh));
1572 out:
1573         if (page)
1574                 __free_page(page);
1575         if (locations)
1576                 kfree(locations);
1577         return status;
1578 }
1579
1580 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1581 {
1582         struct nfs4_getattr_arg args = {
1583                 .fh = fhandle,
1584                 .bitmask = server->attr_bitmask,
1585         };
1586         struct nfs4_getattr_res res = {
1587                 .fattr = fattr,
1588                 .server = server,
1589         };
1590         struct rpc_message msg = {
1591                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1592                 .rpc_argp = &args,
1593                 .rpc_resp = &res,
1594         };
1595
1596         nfs_fattr_init(fattr);
1597         return rpc_call_sync(server->client, &msg, 0);
1598 }
1599
1600 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1601 {
1602         struct nfs4_exception exception = { };
1603         int err;
1604         do {
1605                 err = nfs4_handle_exception(server,
1606                                 _nfs4_proc_getattr(server, fhandle, fattr),
1607                                 &exception);
1608         } while (exception.retry);
1609         return err;
1610 }
1611
1612 /*
1613  * The file is not closed if it is opened due to the a request to change
1614  * the size of the file. The open call will not be needed once the
1615  * VFS layer lookup-intents are implemented.
1616  *
1617  * Close is called when the inode is destroyed.
1618  * If we haven't opened the file for O_WRONLY, we
1619  * need to in the size_change case to obtain a stateid.
1620  *
1621  * Got race?
1622  * Because OPEN is always done by name in nfsv4, it is
1623  * possible that we opened a different file by the same
1624  * name.  We can recognize this race condition, but we
1625  * can't do anything about it besides returning an error.
1626  *
1627  * This will be fixed with VFS changes (lookup-intent).
1628  */
1629 static int
1630 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1631                   struct iattr *sattr)
1632 {
1633         struct rpc_cred *cred;
1634         struct inode *inode = dentry->d_inode;
1635         struct nfs_open_context *ctx;
1636         struct nfs4_state *state = NULL;
1637         int status;
1638
1639         nfs_fattr_init(fattr);
1640
1641         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1642         if (IS_ERR(cred))
1643                 return PTR_ERR(cred);
1644
1645         /* Search for an existing open(O_WRITE) file */
1646         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1647         if (ctx != NULL)
1648                 state = ctx->state;
1649
1650         status = nfs4_do_setattr(inode, fattr, sattr, state);
1651         if (status == 0)
1652                 nfs_setattr_update_inode(inode, sattr);
1653         if (ctx != NULL)
1654                 put_nfs_open_context(ctx);
1655         put_rpccred(cred);
1656         return status;
1657 }
1658
1659 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1660                 const struct qstr *name, struct nfs_fh *fhandle,
1661                 struct nfs_fattr *fattr)
1662 {
1663         int                    status;
1664         struct nfs4_lookup_arg args = {
1665                 .bitmask = server->attr_bitmask,
1666                 .dir_fh = dirfh,
1667                 .name = name,
1668         };
1669         struct nfs4_lookup_res res = {
1670                 .server = server,
1671                 .fattr = fattr,
1672                 .fh = fhandle,
1673         };
1674         struct rpc_message msg = {
1675                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1676                 .rpc_argp = &args,
1677                 .rpc_resp = &res,
1678         };
1679
1680         nfs_fattr_init(fattr);
1681
1682         dprintk("NFS call  lookupfh %s\n", name->name);
1683         status = rpc_call_sync(server->client, &msg, 0);
1684         dprintk("NFS reply lookupfh: %d\n", status);
1685         return status;
1686 }
1687
1688 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1689                               struct qstr *name, struct nfs_fh *fhandle,
1690                               struct nfs_fattr *fattr)
1691 {
1692         struct nfs4_exception exception = { };
1693         int err;
1694         do {
1695                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1696                 /* FIXME: !!!! */
1697                 if (err == -NFS4ERR_MOVED) {
1698                         err = -EREMOTE;
1699                         break;
1700                 }
1701                 err = nfs4_handle_exception(server, err, &exception);
1702         } while (exception.retry);
1703         return err;
1704 }
1705
1706 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1707                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1708 {
1709         int status;
1710
1711         dprintk("NFS call  lookup %s\n", name->name);
1712         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1713         if (status == -NFS4ERR_MOVED)
1714                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1715         dprintk("NFS reply lookup: %d\n", status);
1716         return status;
1717 }
1718
1719 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1720 {
1721         struct nfs4_exception exception = { };
1722         int err;
1723         do {
1724                 err = nfs4_handle_exception(NFS_SERVER(dir),
1725                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1726                                 &exception);
1727         } while (exception.retry);
1728         return err;
1729 }
1730
1731 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1732 {
1733         struct nfs_server *server = NFS_SERVER(inode);
1734         struct nfs_fattr fattr;
1735         struct nfs4_accessargs args = {
1736                 .fh = NFS_FH(inode),
1737                 .bitmask = server->attr_bitmask,
1738         };
1739         struct nfs4_accessres res = {
1740                 .server = server,
1741                 .fattr = &fattr,
1742         };
1743         struct rpc_message msg = {
1744                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1745                 .rpc_argp = &args,
1746                 .rpc_resp = &res,
1747                 .rpc_cred = entry->cred,
1748         };
1749         int mode = entry->mask;
1750         int status;
1751
1752         /*
1753          * Determine which access bits we want to ask for...
1754          */
1755         if (mode & MAY_READ)
1756                 args.access |= NFS4_ACCESS_READ;
1757         if (S_ISDIR(inode->i_mode)) {
1758                 if (mode & MAY_WRITE)
1759                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1760                 if (mode & MAY_EXEC)
1761                         args.access |= NFS4_ACCESS_LOOKUP;
1762         } else {
1763                 if (mode & MAY_WRITE)
1764                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1765                 if (mode & MAY_EXEC)
1766                         args.access |= NFS4_ACCESS_EXECUTE;
1767         }
1768         nfs_fattr_init(&fattr);
1769         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1770         if (!status) {
1771                 entry->mask = 0;
1772                 if (res.access & NFS4_ACCESS_READ)
1773                         entry->mask |= MAY_READ;
1774                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1775                         entry->mask |= MAY_WRITE;
1776                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1777                         entry->mask |= MAY_EXEC;
1778                 nfs_refresh_inode(inode, &fattr);
1779         }
1780         return status;
1781 }
1782
1783 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1784 {
1785         struct nfs4_exception exception = { };
1786         int err;
1787         do {
1788                 err = nfs4_handle_exception(NFS_SERVER(inode),
1789                                 _nfs4_proc_access(inode, entry),
1790                                 &exception);
1791         } while (exception.retry);
1792         return err;
1793 }
1794
1795 /*
1796  * TODO: For the time being, we don't try to get any attributes
1797  * along with any of the zero-copy operations READ, READDIR,
1798  * READLINK, WRITE.
1799  *
1800  * In the case of the first three, we want to put the GETATTR
1801  * after the read-type operation -- this is because it is hard
1802  * to predict the length of a GETATTR response in v4, and thus
1803  * align the READ data correctly.  This means that the GETATTR
1804  * may end up partially falling into the page cache, and we should
1805  * shift it into the 'tail' of the xdr_buf before processing.
1806  * To do this efficiently, we need to know the total length
1807  * of data received, which doesn't seem to be available outside
1808  * of the RPC layer.
1809  *
1810  * In the case of WRITE, we also want to put the GETATTR after
1811  * the operation -- in this case because we want to make sure
1812  * we get the post-operation mtime and size.  This means that
1813  * we can't use xdr_encode_pages() as written: we need a variant
1814  * of it which would leave room in the 'tail' iovec.
1815  *
1816  * Both of these changes to the XDR layer would in fact be quite
1817  * minor, but I decided to leave them for a subsequent patch.
1818  */
1819 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1820                 unsigned int pgbase, unsigned int pglen)
1821 {
1822         struct nfs4_readlink args = {
1823                 .fh       = NFS_FH(inode),
1824                 .pgbase   = pgbase,
1825                 .pglen    = pglen,
1826                 .pages    = &page,
1827         };
1828         struct rpc_message msg = {
1829                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1830                 .rpc_argp = &args,
1831                 .rpc_resp = NULL,
1832         };
1833
1834         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1835 }
1836
1837 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1838                 unsigned int pgbase, unsigned int pglen)
1839 {
1840         struct nfs4_exception exception = { };
1841         int err;
1842         do {
1843                 err = nfs4_handle_exception(NFS_SERVER(inode),
1844                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1845                                 &exception);
1846         } while (exception.retry);
1847         return err;
1848 }
1849
1850 /*
1851  * Got race?
1852  * We will need to arrange for the VFS layer to provide an atomic open.
1853  * Until then, this create/open method is prone to inefficiency and race
1854  * conditions due to the lookup, create, and open VFS calls from sys_open()
1855  * placed on the wire.
1856  *
1857  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1858  * The file will be opened again in the subsequent VFS open call
1859  * (nfs4_proc_file_open).
1860  *
1861  * The open for read will just hang around to be used by any process that
1862  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1863  */
1864
1865 static int
1866 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1867                  int flags, struct nameidata *nd)
1868 {
1869         struct path path = {
1870                 .mnt = nd->mnt,
1871                 .dentry = dentry,
1872         };
1873         struct nfs4_state *state;
1874         struct rpc_cred *cred;
1875         int status = 0;
1876
1877         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1878         if (IS_ERR(cred)) {
1879                 status = PTR_ERR(cred);
1880                 goto out;
1881         }
1882         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1883         put_rpccred(cred);
1884         d_drop(dentry);
1885         if (IS_ERR(state)) {
1886                 status = PTR_ERR(state);
1887                 goto out;
1888         }
1889         d_add(dentry, igrab(state->inode));
1890         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1891         if (flags & O_EXCL) {
1892                 struct nfs_fattr fattr;
1893                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1894                 if (status == 0)
1895                         nfs_setattr_update_inode(state->inode, sattr);
1896                 nfs_post_op_update_inode(state->inode, &fattr);
1897         }
1898         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1899                 status = nfs4_intent_set_file(nd, &path, state);
1900         else
1901                 nfs4_close_state(&path, state, flags);
1902 out:
1903         return status;
1904 }
1905
1906 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1907 {
1908         struct nfs_server *server = NFS_SERVER(dir);
1909         struct nfs_removeargs args = {
1910                 .fh = NFS_FH(dir),
1911                 .name.len = name->len,
1912                 .name.name = name->name,
1913                 .bitmask = server->attr_bitmask,
1914         };
1915         struct nfs_removeres res = {
1916                 .server = server,
1917         };
1918         struct rpc_message msg = {
1919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1920                 .rpc_argp = &args,
1921                 .rpc_resp = &res,
1922         };
1923         int                     status;
1924
1925         nfs_fattr_init(&res.dir_attr);
1926         status = rpc_call_sync(server->client, &msg, 0);
1927         if (status == 0) {
1928                 update_changeattr(dir, &res.cinfo);
1929                 nfs_post_op_update_inode(dir, &res.dir_attr);
1930         }
1931         return status;
1932 }
1933
1934 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1935 {
1936         struct nfs4_exception exception = { };
1937         int err;
1938         do {
1939                 err = nfs4_handle_exception(NFS_SERVER(dir),
1940                                 _nfs4_proc_remove(dir, name),
1941                                 &exception);
1942         } while (exception.retry);
1943         return err;
1944 }
1945
1946 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1947 {
1948         struct nfs_server *server = NFS_SERVER(dir);
1949         struct nfs_removeargs *args = msg->rpc_argp;
1950         struct nfs_removeres *res = msg->rpc_resp;
1951
1952         args->bitmask = server->attr_bitmask;
1953         res->server = server;
1954         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1955 }
1956
1957 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1958 {
1959         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1960
1961         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1962                 return 0;
1963         update_changeattr(dir, &res->cinfo);
1964         nfs_post_op_update_inode(dir, &res->dir_attr);
1965         return 1;
1966 }
1967
1968 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1969                 struct inode *new_dir, struct qstr *new_name)
1970 {
1971         struct nfs_server *server = NFS_SERVER(old_dir);
1972         struct nfs4_rename_arg arg = {
1973                 .old_dir = NFS_FH(old_dir),
1974                 .new_dir = NFS_FH(new_dir),
1975                 .old_name = old_name,
1976                 .new_name = new_name,
1977                 .bitmask = server->attr_bitmask,
1978         };
1979         struct nfs_fattr old_fattr, new_fattr;
1980         struct nfs4_rename_res res = {
1981                 .server = server,
1982                 .old_fattr = &old_fattr,
1983                 .new_fattr = &new_fattr,
1984         };
1985         struct rpc_message msg = {
1986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1987                 .rpc_argp = &arg,
1988                 .rpc_resp = &res,
1989         };
1990         int                     status;
1991
1992         nfs_fattr_init(res.old_fattr);
1993         nfs_fattr_init(res.new_fattr);
1994         status = rpc_call_sync(server->client, &msg, 0);
1995
1996         if (!status) {
1997                 update_changeattr(old_dir, &res.old_cinfo);
1998                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1999                 update_changeattr(new_dir, &res.new_cinfo);
2000                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2001         }
2002         return status;
2003 }
2004
2005 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2006                 struct inode *new_dir, struct qstr *new_name)
2007 {
2008         struct nfs4_exception exception = { };
2009         int err;
2010         do {
2011                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2012                                 _nfs4_proc_rename(old_dir, old_name,
2013                                         new_dir, new_name),
2014                                 &exception);
2015         } while (exception.retry);
2016         return err;
2017 }
2018
2019 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2020 {
2021         struct nfs_server *server = NFS_SERVER(inode);
2022         struct nfs4_link_arg arg = {
2023                 .fh     = NFS_FH(inode),
2024                 .dir_fh = NFS_FH(dir),
2025                 .name   = name,
2026                 .bitmask = server->attr_bitmask,
2027         };
2028         struct nfs_fattr fattr, dir_attr;
2029         struct nfs4_link_res res = {
2030                 .server = server,
2031                 .fattr = &fattr,
2032                 .dir_attr = &dir_attr,
2033         };
2034         struct rpc_message msg = {
2035                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2036                 .rpc_argp = &arg,
2037                 .rpc_resp = &res,
2038         };
2039         int                     status;
2040
2041         nfs_fattr_init(res.fattr);
2042         nfs_fattr_init(res.dir_attr);
2043         status = rpc_call_sync(server->client, &msg, 0);
2044         if (!status) {
2045                 update_changeattr(dir, &res.cinfo);
2046                 nfs_post_op_update_inode(dir, res.dir_attr);
2047                 nfs_post_op_update_inode(inode, res.fattr);
2048         }
2049
2050         return status;
2051 }
2052
2053 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2054 {
2055         struct nfs4_exception exception = { };
2056         int err;
2057         do {
2058                 err = nfs4_handle_exception(NFS_SERVER(inode),
2059                                 _nfs4_proc_link(inode, dir, name),
2060                                 &exception);
2061         } while (exception.retry);
2062         return err;
2063 }
2064
2065 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2066                 struct page *page, unsigned int len, struct iattr *sattr)
2067 {
2068         struct nfs_server *server = NFS_SERVER(dir);
2069         struct nfs_fh fhandle;
2070         struct nfs_fattr fattr, dir_fattr;
2071         struct nfs4_create_arg arg = {
2072                 .dir_fh = NFS_FH(dir),
2073                 .server = server,
2074                 .name = &dentry->d_name,
2075                 .attrs = sattr,
2076                 .ftype = NF4LNK,
2077                 .bitmask = server->attr_bitmask,
2078         };
2079         struct nfs4_create_res res = {
2080                 .server = server,
2081                 .fh = &fhandle,
2082                 .fattr = &fattr,
2083                 .dir_fattr = &dir_fattr,
2084         };
2085         struct rpc_message msg = {
2086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2087                 .rpc_argp = &arg,
2088                 .rpc_resp = &res,
2089         };
2090         int                     status;
2091
2092         if (len > NFS4_MAXPATHLEN)
2093                 return -ENAMETOOLONG;
2094
2095         arg.u.symlink.pages = &page;
2096         arg.u.symlink.len = len;
2097         nfs_fattr_init(&fattr);
2098         nfs_fattr_init(&dir_fattr);
2099
2100         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2101         if (!status) {
2102                 update_changeattr(dir, &res.dir_cinfo);
2103                 nfs_post_op_update_inode(dir, res.dir_fattr);
2104                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2105         }
2106         return status;
2107 }
2108
2109 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2110                 struct page *page, unsigned int len, struct iattr *sattr)
2111 {
2112         struct nfs4_exception exception = { };
2113         int err;
2114         do {
2115                 err = nfs4_handle_exception(NFS_SERVER(dir),
2116                                 _nfs4_proc_symlink(dir, dentry, page,
2117                                                         len, sattr),
2118                                 &exception);
2119         } while (exception.retry);
2120         return err;
2121 }
2122
2123 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2124                 struct iattr *sattr)
2125 {
2126         struct nfs_server *server = NFS_SERVER(dir);
2127         struct nfs_fh fhandle;
2128         struct nfs_fattr fattr, dir_fattr;
2129         struct nfs4_create_arg arg = {
2130                 .dir_fh = NFS_FH(dir),
2131                 .server = server,
2132                 .name = &dentry->d_name,
2133                 .attrs = sattr,
2134                 .ftype = NF4DIR,
2135                 .bitmask = server->attr_bitmask,
2136         };
2137         struct nfs4_create_res res = {
2138                 .server = server,
2139                 .fh = &fhandle,
2140                 .fattr = &fattr,
2141                 .dir_fattr = &dir_fattr,
2142         };
2143         struct rpc_message msg = {
2144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2145                 .rpc_argp = &arg,
2146                 .rpc_resp = &res,
2147         };
2148         int                     status;
2149
2150         nfs_fattr_init(&fattr);
2151         nfs_fattr_init(&dir_fattr);
2152
2153         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2154         if (!status) {
2155                 update_changeattr(dir, &res.dir_cinfo);
2156                 nfs_post_op_update_inode(dir, res.dir_fattr);
2157                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2158         }
2159         return status;
2160 }
2161
2162 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2163                 struct iattr *sattr)
2164 {
2165         struct nfs4_exception exception = { };
2166         int err;
2167         do {
2168                 err = nfs4_handle_exception(NFS_SERVER(dir),
2169                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2170                                 &exception);
2171         } while (exception.retry);
2172         return err;
2173 }
2174
2175 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2176                   u64 cookie, struct page *page, unsigned int count, int plus)
2177 {
2178         struct inode            *dir = dentry->d_inode;
2179         struct nfs4_readdir_arg args = {
2180                 .fh = NFS_FH(dir),
2181                 .pages = &page,
2182                 .pgbase = 0,
2183                 .count = count,
2184                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2185         };
2186         struct nfs4_readdir_res res;
2187         struct rpc_message msg = {
2188                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2189                 .rpc_argp = &args,
2190                 .rpc_resp = &res,
2191                 .rpc_cred = cred,
2192         };
2193         int                     status;
2194
2195         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2196                         dentry->d_parent->d_name.name,
2197                         dentry->d_name.name,
2198                         (unsigned long long)cookie);
2199         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2200         res.pgbase = args.pgbase;
2201         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2202         if (status == 0)
2203                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2204
2205         nfs_invalidate_atime(dir);
2206
2207         dprintk("%s: returns %d\n", __FUNCTION__, status);
2208         return status;
2209 }
2210
2211 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2212                   u64 cookie, struct page *page, unsigned int count, int plus)
2213 {
2214         struct nfs4_exception exception = { };
2215         int err;
2216         do {
2217                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2218                                 _nfs4_proc_readdir(dentry, cred, cookie,
2219                                         page, count, plus),
2220                                 &exception);
2221         } while (exception.retry);
2222         return err;
2223 }
2224
2225 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2226                 struct iattr *sattr, dev_t rdev)
2227 {
2228         struct nfs_server *server = NFS_SERVER(dir);
2229         struct nfs_fh fh;
2230         struct nfs_fattr fattr, dir_fattr;
2231         struct nfs4_create_arg arg = {
2232                 .dir_fh = NFS_FH(dir),
2233                 .server = server,
2234                 .name = &dentry->d_name,
2235                 .attrs = sattr,
2236                 .bitmask = server->attr_bitmask,
2237         };
2238         struct nfs4_create_res res = {
2239                 .server = server,
2240                 .fh = &fh,
2241                 .fattr = &fattr,
2242                 .dir_fattr = &dir_fattr,
2243         };
2244         struct rpc_message msg = {
2245                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2246                 .rpc_argp = &arg,
2247                 .rpc_resp = &res,
2248         };
2249         int                     status;
2250         int                     mode = sattr->ia_mode;
2251
2252         nfs_fattr_init(&fattr);
2253         nfs_fattr_init(&dir_fattr);
2254
2255         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2256         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2257         if (S_ISFIFO(mode))
2258                 arg.ftype = NF4FIFO;
2259         else if (S_ISBLK(mode)) {
2260                 arg.ftype = NF4BLK;
2261                 arg.u.device.specdata1 = MAJOR(rdev);
2262                 arg.u.device.specdata2 = MINOR(rdev);
2263         }
2264         else if (S_ISCHR(mode)) {
2265                 arg.ftype = NF4CHR;
2266                 arg.u.device.specdata1 = MAJOR(rdev);
2267                 arg.u.device.specdata2 = MINOR(rdev);
2268         }
2269         else
2270                 arg.ftype = NF4SOCK;
2271
2272         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2273         if (status == 0) {
2274                 update_changeattr(dir, &res.dir_cinfo);
2275                 nfs_post_op_update_inode(dir, res.dir_fattr);
2276                 status = nfs_instantiate(dentry, &fh, &fattr);
2277         }
2278         return status;
2279 }
2280
2281 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2282                 struct iattr *sattr, dev_t rdev)
2283 {
2284         struct nfs4_exception exception = { };
2285         int err;
2286         do {
2287                 err = nfs4_handle_exception(NFS_SERVER(dir),
2288                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2289                                 &exception);
2290         } while (exception.retry);
2291         return err;
2292 }
2293
2294 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2295                  struct nfs_fsstat *fsstat)
2296 {
2297         struct nfs4_statfs_arg args = {
2298                 .fh = fhandle,
2299                 .bitmask = server->attr_bitmask,
2300         };
2301         struct rpc_message msg = {
2302                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2303                 .rpc_argp = &args,
2304                 .rpc_resp = fsstat,
2305         };
2306
2307         nfs_fattr_init(fsstat->fattr);
2308         return rpc_call_sync(server->client, &msg, 0);
2309 }
2310
2311 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2312 {
2313         struct nfs4_exception exception = { };
2314         int err;
2315         do {
2316                 err = nfs4_handle_exception(server,
2317                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2318                                 &exception);
2319         } while (exception.retry);
2320         return err;
2321 }
2322
2323 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2324                 struct nfs_fsinfo *fsinfo)
2325 {
2326         struct nfs4_fsinfo_arg args = {
2327                 .fh = fhandle,
2328                 .bitmask = server->attr_bitmask,
2329         };
2330         struct rpc_message msg = {
2331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2332                 .rpc_argp = &args,
2333                 .rpc_resp = fsinfo,
2334         };
2335
2336         return rpc_call_sync(server->client, &msg, 0);
2337 }
2338
2339 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2340 {
2341         struct nfs4_exception exception = { };
2342         int err;
2343
2344         do {
2345                 err = nfs4_handle_exception(server,
2346                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2347                                 &exception);
2348         } while (exception.retry);
2349         return err;
2350 }
2351
2352 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2353 {
2354         nfs_fattr_init(fsinfo->fattr);
2355         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2356 }
2357
2358 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2359                 struct nfs_pathconf *pathconf)
2360 {
2361         struct nfs4_pathconf_arg args = {
2362                 .fh = fhandle,
2363                 .bitmask = server->attr_bitmask,
2364         };
2365         struct rpc_message msg = {
2366                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2367                 .rpc_argp = &args,
2368                 .rpc_resp = pathconf,
2369         };
2370
2371         /* None of the pathconf attributes are mandatory to implement */
2372         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2373                 memset(pathconf, 0, sizeof(*pathconf));
2374                 return 0;
2375         }
2376
2377         nfs_fattr_init(pathconf->fattr);
2378         return rpc_call_sync(server->client, &msg, 0);
2379 }
2380
2381 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2382                 struct nfs_pathconf *pathconf)
2383 {
2384         struct nfs4_exception exception = { };
2385         int err;
2386
2387         do {
2388                 err = nfs4_handle_exception(server,
2389                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2390                                 &exception);
2391         } while (exception.retry);
2392         return err;
2393 }
2394
2395 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2396 {
2397         struct nfs_server *server = NFS_SERVER(data->inode);
2398
2399         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2400                 rpc_restart_call(task);
2401                 return -EAGAIN;
2402         }
2403
2404         nfs_invalidate_atime(data->inode);
2405         if (task->tk_status > 0)
2406                 renew_lease(server, data->timestamp);
2407         return 0;
2408 }
2409
2410 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2411 {
2412         struct rpc_message msg = {
2413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2414                 .rpc_argp = &data->args,
2415                 .rpc_resp = &data->res,
2416                 .rpc_cred = data->cred,
2417         };
2418
2419         data->timestamp   = jiffies;
2420
2421         rpc_call_setup(&data->task, &msg, 0);
2422 }
2423
2424 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2425 {
2426         struct inode *inode = data->inode;
2427
2428         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2429                 rpc_restart_call(task);
2430                 return -EAGAIN;
2431         }
2432         if (task->tk_status >= 0) {
2433                 renew_lease(NFS_SERVER(inode), data->timestamp);
2434                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2435         }
2436         return 0;
2437 }
2438
2439 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2440 {
2441         struct rpc_message msg = {
2442                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2443                 .rpc_argp = &data->args,
2444                 .rpc_resp = &data->res,
2445                 .rpc_cred = data->cred,
2446         };
2447         struct inode *inode = data->inode;
2448         struct nfs_server *server = NFS_SERVER(inode);
2449         int stable;
2450
2451         if (how & FLUSH_STABLE) {
2452                 if (!NFS_I(inode)->ncommit)
2453                         stable = NFS_FILE_SYNC;
2454                 else
2455                         stable = NFS_DATA_SYNC;
2456         } else
2457                 stable = NFS_UNSTABLE;
2458         data->args.stable = stable;
2459         data->args.bitmask = server->attr_bitmask;
2460         data->res.server = server;
2461
2462         data->timestamp   = jiffies;
2463
2464         /* Finalize the task. */
2465         rpc_call_setup(&data->task, &msg, 0);
2466 }
2467
2468 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2469 {
2470         struct inode *inode = data->inode;
2471
2472         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2473                 rpc_restart_call(task);
2474                 return -EAGAIN;
2475         }
2476         nfs_refresh_inode(inode, data->res.fattr);
2477         return 0;
2478 }
2479
2480 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2481 {
2482         struct rpc_message msg = {
2483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2484                 .rpc_argp = &data->args,
2485                 .rpc_resp = &data->res,
2486                 .rpc_cred = data->cred,
2487         };
2488         struct nfs_server *server = NFS_SERVER(data->inode);
2489
2490         data->args.bitmask = server->attr_bitmask;
2491         data->res.server = server;
2492
2493         rpc_call_setup(&data->task, &msg, 0);
2494 }
2495
2496 /*
2497  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2498  * standalone procedure for queueing an asynchronous RENEW.
2499  */
2500 static void nfs4_renew_done(struct rpc_task *task, void *data)
2501 {
2502         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2503         unsigned long timestamp = (unsigned long)data;
2504
2505         if (task->tk_status < 0) {
2506                 switch (task->tk_status) {
2507                         case -NFS4ERR_STALE_CLIENTID:
2508                         case -NFS4ERR_EXPIRED:
2509                         case -NFS4ERR_CB_PATH_DOWN:
2510                                 nfs4_schedule_state_recovery(clp);
2511                 }
2512                 return;
2513         }
2514         spin_lock(&clp->cl_lock);
2515         if (time_before(clp->cl_last_renewal,timestamp))
2516                 clp->cl_last_renewal = timestamp;
2517         spin_unlock(&clp->cl_lock);
2518 }
2519
2520 static const struct rpc_call_ops nfs4_renew_ops = {
2521         .rpc_call_done = nfs4_renew_done,
2522 };
2523
2524 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2525 {
2526         struct rpc_message msg = {
2527                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2528                 .rpc_argp       = clp,
2529                 .rpc_cred       = cred,
2530         };
2531
2532         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2533                         &nfs4_renew_ops, (void *)jiffies);
2534 }
2535
2536 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2537 {
2538         struct rpc_message msg = {
2539                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2540                 .rpc_argp       = clp,
2541                 .rpc_cred       = cred,
2542         };
2543         unsigned long now = jiffies;
2544         int status;
2545
2546         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2547         if (status < 0)
2548                 return status;
2549         spin_lock(&clp->cl_lock);
2550         if (time_before(clp->cl_last_renewal,now))
2551                 clp->cl_last_renewal = now;
2552         spin_unlock(&clp->cl_lock);
2553         return 0;
2554 }
2555
2556 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2557 {
2558         return (server->caps & NFS_CAP_ACLS)
2559                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2560                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2561 }
2562
2563 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2564  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2565  * the stack.
2566  */
2567 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2568
2569 static void buf_to_pages(const void *buf, size_t buflen,
2570                 struct page **pages, unsigned int *pgbase)
2571 {
2572         const void *p = buf;
2573
2574         *pgbase = offset_in_page(buf);
2575         p -= *pgbase;
2576         while (p < buf + buflen) {
2577                 *(pages++) = virt_to_page(p);
2578                 p += PAGE_CACHE_SIZE;
2579         }
2580 }
2581
2582 struct nfs4_cached_acl {
2583         int cached;
2584         size_t len;
2585         char data[0];
2586 };
2587
2588 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2589 {
2590         struct nfs_inode *nfsi = NFS_I(inode);
2591
2592         spin_lock(&inode->i_lock);
2593         kfree(nfsi->nfs4_acl);
2594         nfsi->nfs4_acl = acl;
2595         spin_unlock(&inode->i_lock);
2596 }
2597
2598 static void nfs4_zap_acl_attr(struct inode *inode)
2599 {
2600         nfs4_set_cached_acl(inode, NULL);
2601 }
2602
2603 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2604 {
2605         struct nfs_inode *nfsi = NFS_I(inode);
2606         struct nfs4_cached_acl *acl;
2607         int ret = -ENOENT;
2608
2609         spin_lock(&inode->i_lock);
2610         acl = nfsi->nfs4_acl;
2611         if (acl == NULL)
2612                 goto out;
2613         if (buf == NULL) /* user is just asking for length */
2614                 goto out_len;
2615         if (acl->cached == 0)
2616                 goto out;
2617         ret = -ERANGE; /* see getxattr(2) man page */
2618         if (acl->len > buflen)
2619                 goto out;
2620         memcpy(buf, acl->data, acl->len);
2621 out_len:
2622         ret = acl->len;
2623 out:
2624         spin_unlock(&inode->i_lock);
2625         return ret;
2626 }
2627
2628 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2629 {
2630         struct nfs4_cached_acl *acl;
2631
2632         if (buf && acl_len <= PAGE_SIZE) {
2633                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2634                 if (acl == NULL)
2635                         goto out;
2636                 acl->cached = 1;
2637                 memcpy(acl->data, buf, acl_len);
2638         } else {
2639                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2640                 if (acl == NULL)
2641                         goto out;
2642                 acl->cached = 0;
2643         }
2644         acl->len = acl_len;
2645 out:
2646         nfs4_set_cached_acl(inode, acl);
2647 }
2648
2649 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2650 {
2651         struct page *pages[NFS4ACL_MAXPAGES];
2652         struct nfs_getaclargs args = {
2653                 .fh = NFS_FH(inode),
2654                 .acl_pages = pages,
2655                 .acl_len = buflen,
2656         };
2657         size_t resp_len = buflen;
2658         void *resp_buf;
2659         struct rpc_message msg = {
2660                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2661                 .rpc_argp = &args,
2662                 .rpc_resp = &resp_len,
2663         };
2664         struct page *localpage = NULL;
2665         int ret;
2666
2667         if (buflen < PAGE_SIZE) {
2668                 /* As long as we're doing a round trip to the server anyway,
2669                  * let's be prepared for a page of acl data. */
2670                 localpage = alloc_page(GFP_KERNEL);
2671                 resp_buf = page_address(localpage);
2672                 if (localpage == NULL)
2673                         return -ENOMEM;
2674                 args.acl_pages[0] = localpage;
2675                 args.acl_pgbase = 0;
2676                 resp_len = args.acl_len = PAGE_SIZE;
2677         } else {
2678                 resp_buf = buf;
2679                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2680         }
2681         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2682         if (ret)
2683                 goto out_free;
2684         if (resp_len > args.acl_len)
2685                 nfs4_write_cached_acl(inode, NULL, resp_len);
2686         else
2687                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2688         if (buf) {
2689                 ret = -ERANGE;
2690                 if (resp_len > buflen)
2691                         goto out_free;
2692                 if (localpage)
2693                         memcpy(buf, resp_buf, resp_len);
2694         }
2695         ret = resp_len;
2696 out_free:
2697         if (localpage)
2698                 __free_page(localpage);
2699         return ret;
2700 }
2701
2702 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2703 {
2704         struct nfs4_exception exception = { };
2705         ssize_t ret;
2706         do {
2707                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2708                 if (ret >= 0)
2709                         break;
2710                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2711         } while (exception.retry);
2712         return ret;
2713 }
2714
2715 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2716 {
2717         struct nfs_server *server = NFS_SERVER(inode);
2718         int ret;
2719
2720         if (!nfs4_server_supports_acls(server))
2721                 return -EOPNOTSUPP;
2722         ret = nfs_revalidate_inode(server, inode);
2723         if (ret < 0)
2724                 return ret;
2725         ret = nfs4_read_cached_acl(inode, buf, buflen);
2726         if (ret != -ENOENT)
2727                 return ret;
2728         return nfs4_get_acl_uncached(inode, buf, buflen);
2729 }
2730
2731 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2732 {
2733         struct nfs_server *server = NFS_SERVER(inode);
2734         struct page *pages[NFS4ACL_MAXPAGES];
2735         struct nfs_setaclargs arg = {
2736                 .fh             = NFS_FH(inode),
2737                 .acl_pages      = pages,
2738                 .acl_len        = buflen,
2739         };
2740         struct rpc_message msg = {
2741                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2742                 .rpc_argp       = &arg,
2743                 .rpc_resp       = NULL,
2744         };
2745         int ret;
2746
2747         if (!nfs4_server_supports_acls(server))
2748                 return -EOPNOTSUPP;
2749         nfs_inode_return_delegation(inode);
2750         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2751         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2752         nfs_zap_caches(inode);
2753         return ret;
2754 }
2755
2756 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2757 {
2758         struct nfs4_exception exception = { };
2759         int err;
2760         do {
2761                 err = nfs4_handle_exception(NFS_SERVER(inode),
2762                                 __nfs4_proc_set_acl(inode, buf, buflen),
2763                                 &exception);
2764         } while (exception.retry);
2765         return err;
2766 }
2767
2768 static int
2769 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2770 {
2771         struct nfs_client *clp = server->nfs_client;
2772
2773         if (!clp || task->tk_status >= 0)
2774                 return 0;
2775         switch(task->tk_status) {
2776                 case -NFS4ERR_STALE_CLIENTID:
2777                 case -NFS4ERR_STALE_STATEID:
2778                 case -NFS4ERR_EXPIRED:
2779                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2780                         nfs4_schedule_state_recovery(clp);
2781                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2782                                 rpc_wake_up_task(task);
2783                         task->tk_status = 0;
2784                         return -EAGAIN;
2785                 case -NFS4ERR_DELAY:
2786                         nfs_inc_server_stats((struct nfs_server *) server,
2787                                                 NFSIOS_DELAY);
2788                 case -NFS4ERR_GRACE:
2789                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2790                         task->tk_status = 0;
2791                         return -EAGAIN;
2792                 case -NFS4ERR_OLD_STATEID:
2793                         task->tk_status = 0;
2794                         return -EAGAIN;
2795         }
2796         task->tk_status = nfs4_map_errors(task->tk_status);
2797         return 0;
2798 }
2799
2800 static int nfs4_wait_bit_interruptible(void *word)
2801 {
2802         if (signal_pending(current))
2803                 return -ERESTARTSYS;
2804         schedule();
2805         return 0;
2806 }
2807
2808 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2809 {
2810         sigset_t oldset;
2811         int res;
2812
2813         might_sleep();
2814
2815         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2816
2817         rpc_clnt_sigmask(clnt, &oldset);
2818         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2819                         nfs4_wait_bit_interruptible,
2820                         TASK_INTERRUPTIBLE);
2821         rpc_clnt_sigunmask(clnt, &oldset);
2822
2823         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2824         return res;
2825 }
2826
2827 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2828 {
2829         sigset_t oldset;
2830         int res = 0;
2831
2832         might_sleep();
2833
2834         if (*timeout <= 0)
2835                 *timeout = NFS4_POLL_RETRY_MIN;
2836         if (*timeout > NFS4_POLL_RETRY_MAX)
2837                 *timeout = NFS4_POLL_RETRY_MAX;
2838         rpc_clnt_sigmask(clnt, &oldset);
2839         if (clnt->cl_intr) {
2840                 schedule_timeout_interruptible(*timeout);
2841                 if (signalled())
2842                         res = -ERESTARTSYS;
2843         } else
2844                 schedule_timeout_uninterruptible(*timeout);
2845         rpc_clnt_sigunmask(clnt, &oldset);
2846         *timeout <<= 1;
2847         return res;
2848 }
2849
2850 /* This is the error handling routine for processes that are allowed
2851  * to sleep.
2852  */
2853 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2854 {
2855         struct nfs_client *clp = server->nfs_client;
2856         int ret = errorcode;
2857
2858         exception->retry = 0;
2859         switch(errorcode) {
2860                 case 0:
2861                         return 0;
2862                 case -NFS4ERR_STALE_CLIENTID:
2863                 case -NFS4ERR_STALE_STATEID:
2864                 case -NFS4ERR_EXPIRED:
2865                         nfs4_schedule_state_recovery(clp);
2866                         ret = nfs4_wait_clnt_recover(server->client, clp);
2867                         if (ret == 0)
2868                                 exception->retry = 1;
2869                         break;
2870                 case -NFS4ERR_FILE_OPEN:
2871                 case -NFS4ERR_GRACE:
2872                 case -NFS4ERR_DELAY:
2873                         ret = nfs4_delay(server->client, &exception->timeout);
2874                         if (ret != 0)
2875                                 break;
2876                 case -NFS4ERR_OLD_STATEID:
2877                         exception->retry = 1;
2878         }
2879         /* We failed to handle the error */
2880         return nfs4_map_errors(ret);
2881 }
2882
2883 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2884 {
2885         nfs4_verifier sc_verifier;
2886         struct nfs4_setclientid setclientid = {
2887                 .sc_verifier = &sc_verifier,
2888                 .sc_prog = program,
2889         };
2890         struct rpc_message msg = {
2891                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2892                 .rpc_argp = &setclientid,
2893                 .rpc_resp = clp,
2894                 .rpc_cred = cred,
2895         };
2896         __be32 *p;
2897         int loop = 0;
2898         int status;
2899
2900         p = (__be32*)sc_verifier.data;
2901         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2902         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2903
2904         for(;;) {
2905                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2906                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2907                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2908                                 cred->cr_ops->cr_name,
2909                                 clp->cl_id_uniquifier);
2910                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2911                                 sizeof(setclientid.sc_netid), "tcp");
2912                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2913                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2914                                 clp->cl_ipaddr, port >> 8, port & 255);
2915
2916                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2917                 if (status != -NFS4ERR_CLID_INUSE)
2918                         break;
2919                 if (signalled())
2920                         break;
2921                 if (loop++ & 1)
2922                         ssleep(clp->cl_lease_time + 1);
2923                 else
2924                         if (++clp->cl_id_uniquifier == 0)
2925                                 break;
2926         }
2927         return status;
2928 }
2929
2930 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2931 {
2932         struct nfs_fsinfo fsinfo;
2933         struct rpc_message msg = {
2934                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2935                 .rpc_argp = clp,
2936                 .rpc_resp = &fsinfo,
2937                 .rpc_cred = cred,
2938         };
2939         unsigned long now;
2940         int status;
2941
2942         now = jiffies;
2943         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2944         if (status == 0) {
2945                 spin_lock(&clp->cl_lock);
2946                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2947                 clp->cl_last_renewal = now;
2948                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2949                 spin_unlock(&clp->cl_lock);
2950         }
2951         return status;
2952 }
2953
2954 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2955 {
2956         long timeout;
2957         int err;
2958         do {
2959                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2960                 switch (err) {
2961                         case 0:
2962                                 return err;
2963                         case -NFS4ERR_RESOURCE:
2964                                 /* The IBM lawyers misread another document! */
2965                         case -NFS4ERR_DELAY:
2966                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2967                 }
2968         } while (err == 0);
2969         return err;
2970 }
2971
2972 struct nfs4_delegreturndata {
2973         struct nfs4_delegreturnargs args;
2974         struct nfs4_delegreturnres res;
2975         struct nfs_fh fh;
2976         nfs4_stateid stateid;
2977         struct rpc_cred *cred;
2978         unsigned long timestamp;
2979         struct nfs_fattr fattr;
2980         int rpc_status;
2981 };
2982
2983 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2984 {
2985         struct nfs4_delegreturndata *data = calldata;
2986         struct rpc_message msg = {
2987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2988                 .rpc_argp = &data->args,
2989                 .rpc_resp = &data->res,
2990                 .rpc_cred = data->cred,
2991         };
2992         nfs_fattr_init(data->res.fattr);
2993         rpc_call_setup(task, &msg, 0);
2994 }
2995
2996 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2997 {
2998         struct nfs4_delegreturndata *data = calldata;
2999         data->rpc_status = task->tk_status;
3000         if (data->rpc_status == 0)
3001                 renew_lease(data->res.server, data->timestamp);
3002 }
3003
3004 static void nfs4_delegreturn_release(void *calldata)
3005 {
3006         struct nfs4_delegreturndata *data = calldata;
3007
3008         put_rpccred(data->cred);
3009         kfree(calldata);
3010 }
3011
3012 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3013         .rpc_call_prepare = nfs4_delegreturn_prepare,
3014         .rpc_call_done = nfs4_delegreturn_done,
3015         .rpc_release = nfs4_delegreturn_release,
3016 };
3017
3018 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3019 {
3020         struct nfs4_delegreturndata *data;
3021         struct nfs_server *server = NFS_SERVER(inode);
3022         struct rpc_task *task;
3023         int status;
3024
3025         data = kmalloc(sizeof(*data), GFP_KERNEL);
3026         if (data == NULL)
3027                 return -ENOMEM;
3028         data->args.fhandle = &data->fh;
3029         data->args.stateid = &data->stateid;
3030         data->args.bitmask = server->attr_bitmask;
3031         nfs_copy_fh(&data->fh, NFS_FH(inode));
3032         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3033         data->res.fattr = &data->fattr;
3034         data->res.server = server;
3035         data->cred = get_rpccred(cred);
3036         data->timestamp = jiffies;
3037         data->rpc_status = 0;
3038
3039         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3040         if (IS_ERR(task))
3041                 return PTR_ERR(task);
3042         status = nfs4_wait_for_completion_rpc_task(task);
3043         if (status == 0) {
3044                 status = data->rpc_status;
3045                 if (status == 0)
3046                         nfs_refresh_inode(inode, &data->fattr);
3047         }
3048         rpc_put_task(task);
3049         return status;
3050 }
3051
3052 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3053 {
3054         struct nfs_server *server = NFS_SERVER(inode);
3055         struct nfs4_exception exception = { };
3056         int err;
3057         do {
3058                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3059                 switch (err) {
3060                         case -NFS4ERR_STALE_STATEID:
3061                         case -NFS4ERR_EXPIRED:
3062                         case 0:
3063                                 return 0;
3064                 }
3065                 err = nfs4_handle_exception(server, err, &exception);
3066         } while (exception.retry);
3067         return err;
3068 }
3069
3070 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3071 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3072
3073 /*
3074  * sleep, with exponential backoff, and retry the LOCK operation.
3075  */
3076 static unsigned long
3077 nfs4_set_lock_task_retry(unsigned long timeout)
3078 {
3079         schedule_timeout_interruptible(timeout);
3080         timeout <<= 1;
3081         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3082                 return NFS4_LOCK_MAXTIMEOUT;
3083         return timeout;
3084 }
3085
3086 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3087 {
3088         struct inode *inode = state->inode;
3089         struct nfs_server *server = NFS_SERVER(inode);
3090         struct nfs_client *clp = server->nfs_client;
3091         struct nfs_lockt_args arg = {
3092                 .fh = NFS_FH(inode),
3093                 .fl = request,
3094         };
3095         struct nfs_lockt_res res = {
3096                 .denied = request,
3097         };
3098         struct rpc_message msg = {
3099                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3100                 .rpc_argp       = &arg,
3101                 .rpc_resp       = &res,
3102                 .rpc_cred       = state->owner->so_cred,
3103         };
3104         struct nfs4_lock_state *lsp;
3105         int status;
3106
3107         down_read(&clp->cl_sem);
3108         arg.lock_owner.clientid = clp->cl_clientid;
3109         status = nfs4_set_lock_state(state, request);
3110         if (status != 0)
3111                 goto out;
3112         lsp = request->fl_u.nfs4_fl.owner;
3113         arg.lock_owner.id = lsp->ls_id.id;
3114         status = rpc_call_sync(server->client, &msg, 0);
3115         switch (status) {
3116                 case 0:
3117                         request->fl_type = F_UNLCK;
3118                         break;
3119                 case -NFS4ERR_DENIED:
3120                         status = 0;
3121         }
3122         request->fl_ops->fl_release_private(request);
3123 out:
3124         up_read(&clp->cl_sem);
3125         return status;
3126 }
3127
3128 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3129 {
3130         struct nfs4_exception exception = { };
3131         int err;
3132
3133         do {
3134                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3135                                 _nfs4_proc_getlk(state, cmd, request),
3136                                 &exception);
3137         } while (exception.retry);
3138         return err;
3139 }
3140
3141 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3142 {
3143         int res = 0;
3144         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3145                 case FL_POSIX:
3146                         res = posix_lock_file_wait(file, fl);
3147                         break;
3148                 case FL_FLOCK:
3149                         res = flock_lock_file_wait(file, fl);
3150                         break;
3151                 default:
3152                         BUG();
3153         }
3154         return res;
3155 }
3156
3157 struct nfs4_unlockdata {
3158         struct nfs_locku_args arg;
3159         struct nfs_locku_res res;
3160         struct nfs4_lock_state *lsp;
3161         struct nfs_open_context *ctx;
3162         struct file_lock fl;
3163         const struct nfs_server *server;
3164         unsigned long timestamp;
3165 };
3166
3167 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3168                 struct nfs_open_context *ctx,
3169                 struct nfs4_lock_state *lsp,
3170                 struct nfs_seqid *seqid)
3171 {
3172         struct nfs4_unlockdata *p;
3173         struct inode *inode = lsp->ls_state->inode;
3174
3175         p = kmalloc(sizeof(*p), GFP_KERNEL);
3176         if (p == NULL)
3177                 return NULL;
3178         p->arg.fh = NFS_FH(inode);
3179         p->arg.fl = &p->fl;
3180         p->arg.seqid = seqid;
3181         p->arg.stateid = &lsp->ls_stateid;
3182         p->lsp = lsp;
3183         atomic_inc(&lsp->ls_count);
3184         /* Ensure we don't close file until we're done freeing locks! */
3185         p->ctx = get_nfs_open_context(ctx);
3186         memcpy(&p->fl, fl, sizeof(p->fl));
3187         p->server = NFS_SERVER(inode);
3188         return p;
3189 }
3190
3191 static void nfs4_locku_release_calldata(void *data)
3192 {
3193         struct nfs4_unlockdata *calldata = data;
3194         nfs_free_seqid(calldata->arg.seqid);
3195         nfs4_put_lock_state(calldata->lsp);
3196         put_nfs_open_context(calldata->ctx);
3197         kfree(calldata);
3198 }
3199
3200 static void nfs4_locku_done(struct rpc_task *task, void *data)
3201 {
3202         struct nfs4_unlockdata *calldata = data;
3203
3204         if (RPC_ASSASSINATED(task))
3205                 return;
3206         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3207         switch (task->tk_status) {
3208                 case 0:
3209                         memcpy(calldata->lsp->ls_stateid.data,
3210                                         calldata->res.stateid.data,
3211                                         sizeof(calldata->lsp->ls_stateid.data));
3212                         renew_lease(calldata->server, calldata->timestamp);
3213                         break;
3214                 case -NFS4ERR_STALE_STATEID:
3215                 case -NFS4ERR_EXPIRED:
3216                         break;
3217                 default:
3218                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3219                                 rpc_restart_call(task);
3220         }
3221 }
3222
3223 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3224 {
3225         struct nfs4_unlockdata *calldata = data;
3226         struct rpc_message msg = {
3227                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3228                 .rpc_argp       = &calldata->arg,
3229                 .rpc_resp       = &calldata->res,
3230                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3231         };
3232
3233         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3234                 return;
3235         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3236                 /* Note: exit _without_ running nfs4_locku_done */
3237                 task->tk_action = NULL;
3238                 return;
3239         }
3240         calldata->timestamp = jiffies;
3241         rpc_call_setup(task, &msg, 0);
3242 }
3243
3244 static const struct rpc_call_ops nfs4_locku_ops = {
3245         .rpc_call_prepare = nfs4_locku_prepare,
3246         .rpc_call_done = nfs4_locku_done,
3247         .rpc_release = nfs4_locku_release_calldata,
3248 };
3249
3250 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3251                 struct nfs_open_context *ctx,
3252                 struct nfs4_lock_state *lsp,
3253                 struct nfs_seqid *seqid)
3254 {
3255         struct nfs4_unlockdata *data;
3256
3257         /* Ensure this is an unlock - when canceling a lock, the
3258          * canceled lock is passed in, and it won't be an unlock.
3259          */
3260         fl->fl_type = F_UNLCK;
3261
3262         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3263         if (data == NULL) {
3264                 nfs_free_seqid(seqid);
3265                 return ERR_PTR(-ENOMEM);
3266         }
3267
3268         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3269 }
3270
3271 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3272 {
3273         struct nfs_seqid *seqid;
3274         struct nfs4_lock_state *lsp;
3275         struct rpc_task *task;
3276         int status = 0;
3277
3278         status = nfs4_set_lock_state(state, request);
3279         /* Unlock _before_ we do the RPC call */
3280         request->fl_flags |= FL_EXISTS;
3281         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3282                 goto out;
3283         if (status != 0)
3284                 goto out;
3285         /* Is this a delegated lock? */
3286         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3287                 goto out;
3288         lsp = request->fl_u.nfs4_fl.owner;
3289         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3290         status = -ENOMEM;
3291         if (seqid == NULL)
3292                 goto out;
3293         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3294         status = PTR_ERR(task);
3295         if (IS_ERR(task))
3296                 goto out;
3297         status = nfs4_wait_for_completion_rpc_task(task);
3298         rpc_put_task(task);
3299 out:
3300         return status;
3301 }
3302
3303 struct nfs4_lockdata {
3304         struct nfs_lock_args arg;
3305         struct nfs_lock_res res;
3306         struct nfs4_lock_state *lsp;
3307         struct nfs_open_context *ctx;
3308         struct file_lock fl;
3309         unsigned long timestamp;
3310         int rpc_status;
3311         int cancelled;
3312 };
3313
3314 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3315                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3316 {
3317         struct nfs4_lockdata *p;
3318         struct inode *inode = lsp->ls_state->inode;
3319         struct nfs_server *server = NFS_SERVER(inode);
3320
3321         p = kzalloc(sizeof(*p), GFP_KERNEL);
3322         if (p == NULL)
3323                 return NULL;
3324
3325         p->arg.fh = NFS_FH(inode);
3326         p->arg.fl = &p->fl;
3327         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3328         if (p->arg.lock_seqid == NULL)
3329                 goto out_free;
3330         p->arg.lock_stateid = &lsp->ls_stateid;
3331         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3332         p->arg.lock_owner.id = lsp->ls_id.id;
3333         p->lsp = lsp;
3334         atomic_inc(&lsp->ls_count);
3335         p->ctx = get_nfs_open_context(ctx);
3336         memcpy(&p->fl, fl, sizeof(p->fl));
3337         return p;
3338 out_free:
3339         kfree(p);
3340         return NULL;
3341 }
3342
3343 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3344 {
3345         struct nfs4_lockdata *data = calldata;
3346         struct nfs4_state *state = data->lsp->ls_state;
3347         struct nfs4_state_owner *sp = state->owner;
3348         struct rpc_message msg = {
3349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3350                 .rpc_argp = &data->arg,
3351                 .rpc_resp = &data->res,
3352                 .rpc_cred = sp->so_cred,
3353         };
3354
3355         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3356                 return;
3357         dprintk("%s: begin!\n", __FUNCTION__);
3358         /* Do we need to do an open_to_lock_owner? */
3359         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3360                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3361                 if (data->arg.open_seqid == NULL) {
3362                         data->rpc_status = -ENOMEM;
3363                         task->tk_action = NULL;
3364                         goto out;
3365                 }
3366                 data->arg.open_stateid = &state->stateid;
3367                 data->arg.new_lock_owner = 1;
3368         }
3369         data->timestamp = jiffies;
3370         rpc_call_setup(task, &msg, 0);
3371 out:
3372         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3373 }
3374
3375 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3376 {
3377         struct nfs4_lockdata *data = calldata;
3378
3379         dprintk("%s: begin!\n", __FUNCTION__);
3380
3381         data->rpc_status = task->tk_status;
3382         if (RPC_ASSASSINATED(task))
3383                 goto out;
3384         if (data->arg.new_lock_owner != 0) {
3385                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3386                 if (data->rpc_status == 0)
3387                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3388                 else
3389                         goto out;
3390         }
3391         if (data->rpc_status == 0) {
3392                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3393                                         sizeof(data->lsp->ls_stateid.data));
3394                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3395                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3396         }
3397         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3398 out:
3399         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3400 }
3401
3402 static void nfs4_lock_release(void *calldata)
3403 {
3404         struct nfs4_lockdata *data = calldata;
3405
3406         dprintk("%s: begin!\n", __FUNCTION__);
3407         if (data->arg.open_seqid != NULL)
3408                 nfs_free_seqid(data->arg.open_seqid);
3409         if (data->cancelled != 0) {
3410                 struct rpc_task *task;
3411                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3412                                 data->arg.lock_seqid);
3413                 if (!IS_ERR(task))
3414                         rpc_put_task(task);
3415                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3416         } else
3417                 nfs_free_seqid(data->arg.lock_seqid);
3418         nfs4_put_lock_state(data->lsp);
3419         put_nfs_open_context(data->ctx);
3420         kfree(data);
3421         dprintk("%s: done!\n", __FUNCTION__);
3422 }
3423
3424 static const struct rpc_call_ops nfs4_lock_ops = {
3425         .rpc_call_prepare = nfs4_lock_prepare,
3426         .rpc_call_done = nfs4_lock_done,
3427         .rpc_release = nfs4_lock_release,
3428 };
3429
3430 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3431 {
3432         struct nfs4_lockdata *data;
3433         struct rpc_task *task;
3434         int ret;
3435
3436         dprintk("%s: begin!\n", __FUNCTION__);
3437         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3438                         fl->fl_u.nfs4_fl.owner);
3439         if (data == NULL)
3440                 return -ENOMEM;
3441         if (IS_SETLKW(cmd))
3442                 data->arg.block = 1;
3443         if (reclaim != 0)
3444                 data->arg.reclaim = 1;
3445         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3446                         &nfs4_lock_ops, data);
3447         if (IS_ERR(task))
3448                 return PTR_ERR(task);
3449         ret = nfs4_wait_for_completion_rpc_task(task);
3450         if (ret == 0) {
3451                 ret = data->rpc_status;
3452                 if (ret == -NFS4ERR_DENIED)
3453                         ret = -EAGAIN;
3454         } else
3455                 data->cancelled = 1;
3456         rpc_put_task(task);
3457         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3458         return ret;
3459 }
3460
3461 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3462 {
3463         struct nfs_server *server = NFS_SERVER(state->inode);
3464         struct nfs4_exception exception = { };
3465         int err;
3466
3467         do {
3468                 /* Cache the lock if possible... */
3469                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3470                         return 0;
3471                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3472                 if (err != -NFS4ERR_DELAY)
3473                         break;
3474                 nfs4_handle_exception(server, err, &exception);
3475         } while (exception.retry);
3476         return err;
3477 }
3478
3479 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3480 {
3481         struct nfs_server *server = NFS_SERVER(state->inode);
3482         struct nfs4_exception exception = { };
3483         int err;
3484
3485         err = nfs4_set_lock_state(state, request);
3486         if (err != 0)
3487                 return err;
3488         do {
3489                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3490                         return 0;
3491                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3492                 if (err != -NFS4ERR_DELAY)
3493                         break;
3494                 nfs4_handle_exception(server, err, &exception);
3495         } while (exception.retry);
3496         return err;
3497 }
3498
3499 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3500 {
3501         struct nfs_client *clp = state->owner->so_client;
3502         unsigned char fl_flags = request->fl_flags;
3503         int status;
3504
3505         /* Is this a delegated open? */
3506         status = nfs4_set_lock_state(state, request);
3507         if (status != 0)
3508                 goto out;
3509         request->fl_flags |= FL_ACCESS;
3510         status = do_vfs_lock(request->fl_file, request);
3511         if (status < 0)
3512                 goto out;
3513         down_read(&clp->cl_sem);
3514         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3515                 struct nfs_inode *nfsi = NFS_I(state->inode);
3516                 /* Yes: cache locks! */
3517                 down_read(&nfsi->rwsem);
3518                 /* ...but avoid races with delegation recall... */
3519                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3520                         request->fl_flags = fl_flags & ~FL_SLEEP;
3521                         status = do_vfs_lock(request->fl_file, request);
3522                         up_read(&nfsi->rwsem);
3523                         goto out_unlock;
3524                 }
3525                 up_read(&nfsi->rwsem);
3526         }
3527         status = _nfs4_do_setlk(state, cmd, request, 0);
3528         if (status != 0)
3529                 goto out_unlock;
3530         /* Note: we always want to sleep here! */
3531         request->fl_flags = fl_flags | FL_SLEEP;
3532         if (do_vfs_lock(request->fl_file, request) < 0)
3533                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3534 out_unlock:
3535         up_read(&clp->cl_sem);
3536 out:
3537         request->fl_flags = fl_flags;
3538         return status;
3539 }
3540
3541 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3542 {
3543         struct nfs4_exception exception = { };
3544         int err;
3545
3546         do {
3547                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3548                                 _nfs4_proc_setlk(state, cmd, request),
3549                                 &exception);
3550         } while (exception.retry);
3551         return err;
3552 }
3553
3554 static int
3555 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3556 {
3557         struct nfs_open_context *ctx;
3558         struct nfs4_state *state;
3559         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3560         int status;
3561
3562         /* verify open state */
3563         ctx = nfs_file_open_context(filp);
3564         state = ctx->state;
3565
3566         if (request->fl_start < 0 || request->fl_end < 0)
3567                 return -EINVAL;
3568
3569         if (IS_GETLK(cmd))
3570                 return nfs4_proc_getlk(state, F_GETLK, request);
3571
3572         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3573                 return -EINVAL;
3574
3575         if (request->fl_type == F_UNLCK)
3576                 return nfs4_proc_unlck(state, cmd, request);
3577
3578         do {
3579                 status = nfs4_proc_setlk(state, cmd, request);
3580                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3581                         break;
3582                 timeout = nfs4_set_lock_task_retry(timeout);
3583                 status = -ERESTARTSYS;
3584                 if (signalled())
3585                         break;
3586         } while(status < 0);
3587         return status;
3588 }
3589
3590 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3591 {
3592         struct nfs_server *server = NFS_SERVER(state->inode);
3593         struct nfs4_exception exception = { };
3594         int err;
3595
3596         err = nfs4_set_lock_state(state, fl);
3597         if (err != 0)
3598                 goto out;
3599         do {
3600                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3601                 if (err != -NFS4ERR_DELAY)
3602                         break;
3603                 err = nfs4_handle_exception(server, err, &exception);
3604         } while (exception.retry);
3605 out:
3606         return err;
3607 }
3608
3609 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3610
3611 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3612                 size_t buflen, int flags)
3613 {
3614         struct inode *inode = dentry->d_inode;
3615
3616         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3617                 return -EOPNOTSUPP;
3618
3619         if (!S_ISREG(inode->i_mode) &&
3620             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3621                 return -EPERM;
3622
3623         return nfs4_proc_set_acl(inode, buf, buflen);
3624 }
3625
3626 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3627  * and that's what we'll do for e.g. user attributes that haven't been set.
3628  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3629  * attributes in kernel-managed attribute namespaces. */
3630 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3631                 size_t buflen)
3632 {
3633         struct inode *inode = dentry->d_inode;
3634
3635         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3636                 return -EOPNOTSUPP;
3637
3638         return nfs4_proc_get_acl(inode, buf, buflen);
3639 }
3640
3641 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3642 {
3643         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3644
3645         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3646                 return 0;
3647         if (buf && buflen < len)
3648                 return -ERANGE;
3649         if (buf)
3650                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3651         return len;
3652 }
3653
3654 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3655                 struct nfs4_fs_locations *fs_locations, struct page *page)
3656 {
3657         struct nfs_server *server = NFS_SERVER(dir);
3658         u32 bitmask[2] = {
3659                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3660                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3661         };
3662         struct nfs4_fs_locations_arg args = {
3663                 .dir_fh = NFS_FH(dir),
3664                 .name = name,
3665                 .page = page,
3666                 .bitmask = bitmask,
3667         };
3668         struct rpc_message msg = {
3669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3670                 .rpc_argp = &args,
3671                 .rpc_resp = fs_locations,
3672         };
3673         int status;
3674
3675         dprintk("%s: start\n", __FUNCTION__);
3676         nfs_fattr_init(&fs_locations->fattr);
3677         fs_locations->server = server;
3678         fs_locations->nlocations = 0;
3679         status = rpc_call_sync(server->client, &msg, 0);
3680         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3681         return status;
3682 }
3683
3684 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3685         .recover_open   = nfs4_open_reclaim,
3686         .recover_lock   = nfs4_lock_reclaim,
3687 };
3688
3689 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3690         .recover_open   = nfs4_open_expired,
3691         .recover_lock   = nfs4_lock_expired,
3692 };
3693
3694 static const struct inode_operations nfs4_file_inode_operations = {
3695         .permission     = nfs_permission,
3696         .getattr        = nfs_getattr,
3697         .setattr        = nfs_setattr,
3698         .getxattr       = nfs4_getxattr,
3699         .setxattr       = nfs4_setxattr,
3700         .listxattr      = nfs4_listxattr,
3701 };
3702
3703 const struct nfs_rpc_ops nfs_v4_clientops = {
3704         .version        = 4,                    /* protocol version */
3705         .dentry_ops     = &nfs4_dentry_operations,
3706         .dir_inode_ops  = &nfs4_dir_inode_operations,
3707         .file_inode_ops = &nfs4_file_inode_operations,
3708         .getroot        = nfs4_proc_get_root,
3709         .getattr        = nfs4_proc_getattr,
3710         .setattr        = nfs4_proc_setattr,
3711         .lookupfh       = nfs4_proc_lookupfh,
3712         .lookup         = nfs4_proc_lookup,
3713         .access         = nfs4_proc_access,
3714         .readlink       = nfs4_proc_readlink,
3715         .create         = nfs4_proc_create,
3716         .remove         = nfs4_proc_remove,
3717         .unlink_setup   = nfs4_proc_unlink_setup,
3718         .unlink_done    = nfs4_proc_unlink_done,
3719         .rename         = nfs4_proc_rename,
3720         .link           = nfs4_proc_link,
3721         .symlink        = nfs4_proc_symlink,
3722         .mkdir          = nfs4_proc_mkdir,
3723         .rmdir          = nfs4_proc_remove,
3724         .readdir        = nfs4_proc_readdir,
3725         .mknod          = nfs4_proc_mknod,
3726         .statfs         = nfs4_proc_statfs,
3727         .fsinfo         = nfs4_proc_fsinfo,
3728         .pathconf       = nfs4_proc_pathconf,
3729         .set_capabilities = nfs4_server_capabilities,
3730         .decode_dirent  = nfs4_decode_dirent,
3731         .read_setup     = nfs4_proc_read_setup,
3732         .read_done      = nfs4_read_done,
3733         .write_setup    = nfs4_proc_write_setup,
3734         .write_done     = nfs4_write_done,
3735         .commit_setup   = nfs4_proc_commit_setup,
3736         .commit_done    = nfs4_commit_done,
3737         .file_open      = nfs_open,
3738         .file_release   = nfs_release,
3739         .lock           = nfs4_proc_lock,
3740         .clear_acl_cache = nfs4_zap_acl_attr,
3741 };
3742
3743 /*
3744  * Local variables:
3745  *  c-basic-offset: 8
3746  * End:
3747  */