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 dentry *parent;
1376         struct path path = {
1377                 .mnt = nd->mnt,
1378                 .dentry = dentry,
1379         };
1380         struct iattr attr;
1381         struct rpc_cred *cred;
1382         struct nfs4_state *state;
1383         struct dentry *res;
1384
1385         if (nd->flags & LOOKUP_CREATE) {
1386                 attr.ia_mode = nd->intent.open.create_mode;
1387                 attr.ia_valid = ATTR_MODE;
1388                 if (!IS_POSIXACL(dir))
1389                         attr.ia_mode &= ~current->fs->umask;
1390         } else {
1391                 attr.ia_valid = 0;
1392                 BUG_ON(nd->intent.open.flags & O_CREAT);
1393         }
1394
1395         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1396         if (IS_ERR(cred))
1397                 return (struct dentry *)cred;
1398         parent = dentry->d_parent;
1399         /* Protect against concurrent sillydeletes */
1400         nfs_block_sillyrename(parent);
1401         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1402         put_rpccred(cred);
1403         if (IS_ERR(state)) {
1404                 if (PTR_ERR(state) == -ENOENT) {
1405                         d_add(dentry, NULL);
1406                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1407                 }
1408                 nfs_unblock_sillyrename(parent);
1409                 return (struct dentry *)state;
1410         }
1411         res = d_add_unique(dentry, igrab(state->inode));
1412         if (res != NULL)
1413                 path.dentry = res;
1414         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1415         nfs_unblock_sillyrename(parent);
1416         nfs4_intent_set_file(nd, &path, state);
1417         return res;
1418 }
1419
1420 int
1421 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1422 {
1423         struct path path = {
1424                 .mnt = nd->mnt,
1425                 .dentry = dentry,
1426         };
1427         struct rpc_cred *cred;
1428         struct nfs4_state *state;
1429
1430         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1431         if (IS_ERR(cred))
1432                 return PTR_ERR(cred);
1433         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1434         put_rpccred(cred);
1435         if (IS_ERR(state)) {
1436                 switch (PTR_ERR(state)) {
1437                         case -EPERM:
1438                         case -EACCES:
1439                         case -EDQUOT:
1440                         case -ENOSPC:
1441                         case -EROFS:
1442                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1443                                 return 1;
1444                         default:
1445                                 goto out_drop;
1446                 }
1447         }
1448         if (state->inode == dentry->d_inode) {
1449                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1450                 nfs4_intent_set_file(nd, &path, state);
1451                 return 1;
1452         }
1453         nfs4_close_state(&path, state, openflags);
1454 out_drop:
1455         d_drop(dentry);
1456         return 0;
1457 }
1458
1459
1460 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1461 {
1462         struct nfs4_server_caps_res res = {};
1463         struct rpc_message msg = {
1464                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1465                 .rpc_argp = fhandle,
1466                 .rpc_resp = &res,
1467         };
1468         int status;
1469
1470         status = rpc_call_sync(server->client, &msg, 0);
1471         if (status == 0) {
1472                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1473                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1474                         server->caps |= NFS_CAP_ACLS;
1475                 if (res.has_links != 0)
1476                         server->caps |= NFS_CAP_HARDLINKS;
1477                 if (res.has_symlinks != 0)
1478                         server->caps |= NFS_CAP_SYMLINKS;
1479                 server->acl_bitmask = res.acl_bitmask;
1480         }
1481         return status;
1482 }
1483
1484 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1485 {
1486         struct nfs4_exception exception = { };
1487         int err;
1488         do {
1489                 err = nfs4_handle_exception(server,
1490                                 _nfs4_server_capabilities(server, fhandle),
1491                                 &exception);
1492         } while (exception.retry);
1493         return err;
1494 }
1495
1496 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1497                 struct nfs_fsinfo *info)
1498 {
1499         struct nfs4_lookup_root_arg args = {
1500                 .bitmask = nfs4_fattr_bitmap,
1501         };
1502         struct nfs4_lookup_res res = {
1503                 .server = server,
1504                 .fattr = info->fattr,
1505                 .fh = fhandle,
1506         };
1507         struct rpc_message msg = {
1508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1509                 .rpc_argp = &args,
1510                 .rpc_resp = &res,
1511         };
1512         nfs_fattr_init(info->fattr);
1513         return rpc_call_sync(server->client, &msg, 0);
1514 }
1515
1516 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1517                 struct nfs_fsinfo *info)
1518 {
1519         struct nfs4_exception exception = { };
1520         int err;
1521         do {
1522                 err = nfs4_handle_exception(server,
1523                                 _nfs4_lookup_root(server, fhandle, info),
1524                                 &exception);
1525         } while (exception.retry);
1526         return err;
1527 }
1528
1529 /*
1530  * get the file handle for the "/" directory on the server
1531  */
1532 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1533                               struct nfs_fsinfo *info)
1534 {
1535         int status;
1536
1537         status = nfs4_lookup_root(server, fhandle, info);
1538         if (status == 0)
1539                 status = nfs4_server_capabilities(server, fhandle);
1540         if (status == 0)
1541                 status = nfs4_do_fsinfo(server, fhandle, info);
1542         return nfs4_map_errors(status);
1543 }
1544
1545 /*
1546  * Get locations and (maybe) other attributes of a referral.
1547  * Note that we'll actually follow the referral later when
1548  * we detect fsid mismatch in inode revalidation
1549  */
1550 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1551 {
1552         int status = -ENOMEM;
1553         struct page *page = NULL;
1554         struct nfs4_fs_locations *locations = NULL;
1555
1556         page = alloc_page(GFP_KERNEL);
1557         if (page == NULL)
1558                 goto out;
1559         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1560         if (locations == NULL)
1561                 goto out;
1562
1563         status = nfs4_proc_fs_locations(dir, name, locations, page);
1564         if (status != 0)
1565                 goto out;
1566         /* Make sure server returned a different fsid for the referral */
1567         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1568                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1569                 status = -EIO;
1570                 goto out;
1571         }
1572
1573         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1574         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1575         if (!fattr->mode)
1576                 fattr->mode = S_IFDIR;
1577         memset(fhandle, 0, sizeof(struct nfs_fh));
1578 out:
1579         if (page)
1580                 __free_page(page);
1581         if (locations)
1582                 kfree(locations);
1583         return status;
1584 }
1585
1586 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1587 {
1588         struct nfs4_getattr_arg args = {
1589                 .fh = fhandle,
1590                 .bitmask = server->attr_bitmask,
1591         };
1592         struct nfs4_getattr_res res = {
1593                 .fattr = fattr,
1594                 .server = server,
1595         };
1596         struct rpc_message msg = {
1597                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1598                 .rpc_argp = &args,
1599                 .rpc_resp = &res,
1600         };
1601
1602         nfs_fattr_init(fattr);
1603         return rpc_call_sync(server->client, &msg, 0);
1604 }
1605
1606 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1607 {
1608         struct nfs4_exception exception = { };
1609         int err;
1610         do {
1611                 err = nfs4_handle_exception(server,
1612                                 _nfs4_proc_getattr(server, fhandle, fattr),
1613                                 &exception);
1614         } while (exception.retry);
1615         return err;
1616 }
1617
1618 /*
1619  * The file is not closed if it is opened due to the a request to change
1620  * the size of the file. The open call will not be needed once the
1621  * VFS layer lookup-intents are implemented.
1622  *
1623  * Close is called when the inode is destroyed.
1624  * If we haven't opened the file for O_WRONLY, we
1625  * need to in the size_change case to obtain a stateid.
1626  *
1627  * Got race?
1628  * Because OPEN is always done by name in nfsv4, it is
1629  * possible that we opened a different file by the same
1630  * name.  We can recognize this race condition, but we
1631  * can't do anything about it besides returning an error.
1632  *
1633  * This will be fixed with VFS changes (lookup-intent).
1634  */
1635 static int
1636 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1637                   struct iattr *sattr)
1638 {
1639         struct rpc_cred *cred;
1640         struct inode *inode = dentry->d_inode;
1641         struct nfs_open_context *ctx;
1642         struct nfs4_state *state = NULL;
1643         int status;
1644
1645         nfs_fattr_init(fattr);
1646
1647         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1648         if (IS_ERR(cred))
1649                 return PTR_ERR(cred);
1650
1651         /* Search for an existing open(O_WRITE) file */
1652         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1653         if (ctx != NULL)
1654                 state = ctx->state;
1655
1656         status = nfs4_do_setattr(inode, fattr, sattr, state);
1657         if (status == 0)
1658                 nfs_setattr_update_inode(inode, sattr);
1659         if (ctx != NULL)
1660                 put_nfs_open_context(ctx);
1661         put_rpccred(cred);
1662         return status;
1663 }
1664
1665 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1666                 const struct qstr *name, struct nfs_fh *fhandle,
1667                 struct nfs_fattr *fattr)
1668 {
1669         int                    status;
1670         struct nfs4_lookup_arg args = {
1671                 .bitmask = server->attr_bitmask,
1672                 .dir_fh = dirfh,
1673                 .name = name,
1674         };
1675         struct nfs4_lookup_res res = {
1676                 .server = server,
1677                 .fattr = fattr,
1678                 .fh = fhandle,
1679         };
1680         struct rpc_message msg = {
1681                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1682                 .rpc_argp = &args,
1683                 .rpc_resp = &res,
1684         };
1685
1686         nfs_fattr_init(fattr);
1687
1688         dprintk("NFS call  lookupfh %s\n", name->name);
1689         status = rpc_call_sync(server->client, &msg, 0);
1690         dprintk("NFS reply lookupfh: %d\n", status);
1691         return status;
1692 }
1693
1694 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1695                               struct qstr *name, struct nfs_fh *fhandle,
1696                               struct nfs_fattr *fattr)
1697 {
1698         struct nfs4_exception exception = { };
1699         int err;
1700         do {
1701                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1702                 /* FIXME: !!!! */
1703                 if (err == -NFS4ERR_MOVED) {
1704                         err = -EREMOTE;
1705                         break;
1706                 }
1707                 err = nfs4_handle_exception(server, err, &exception);
1708         } while (exception.retry);
1709         return err;
1710 }
1711
1712 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1713                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1714 {
1715         int status;
1716
1717         dprintk("NFS call  lookup %s\n", name->name);
1718         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1719         if (status == -NFS4ERR_MOVED)
1720                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1721         dprintk("NFS reply lookup: %d\n", status);
1722         return status;
1723 }
1724
1725 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1726 {
1727         struct nfs4_exception exception = { };
1728         int err;
1729         do {
1730                 err = nfs4_handle_exception(NFS_SERVER(dir),
1731                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1732                                 &exception);
1733         } while (exception.retry);
1734         return err;
1735 }
1736
1737 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1738 {
1739         struct nfs_server *server = NFS_SERVER(inode);
1740         struct nfs_fattr fattr;
1741         struct nfs4_accessargs args = {
1742                 .fh = NFS_FH(inode),
1743                 .bitmask = server->attr_bitmask,
1744         };
1745         struct nfs4_accessres res = {
1746                 .server = server,
1747                 .fattr = &fattr,
1748         };
1749         struct rpc_message msg = {
1750                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1751                 .rpc_argp = &args,
1752                 .rpc_resp = &res,
1753                 .rpc_cred = entry->cred,
1754         };
1755         int mode = entry->mask;
1756         int status;
1757
1758         /*
1759          * Determine which access bits we want to ask for...
1760          */
1761         if (mode & MAY_READ)
1762                 args.access |= NFS4_ACCESS_READ;
1763         if (S_ISDIR(inode->i_mode)) {
1764                 if (mode & MAY_WRITE)
1765                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1766                 if (mode & MAY_EXEC)
1767                         args.access |= NFS4_ACCESS_LOOKUP;
1768         } else {
1769                 if (mode & MAY_WRITE)
1770                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1771                 if (mode & MAY_EXEC)
1772                         args.access |= NFS4_ACCESS_EXECUTE;
1773         }
1774         nfs_fattr_init(&fattr);
1775         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1776         if (!status) {
1777                 entry->mask = 0;
1778                 if (res.access & NFS4_ACCESS_READ)
1779                         entry->mask |= MAY_READ;
1780                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1781                         entry->mask |= MAY_WRITE;
1782                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1783                         entry->mask |= MAY_EXEC;
1784                 nfs_refresh_inode(inode, &fattr);
1785         }
1786         return status;
1787 }
1788
1789 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1790 {
1791         struct nfs4_exception exception = { };
1792         int err;
1793         do {
1794                 err = nfs4_handle_exception(NFS_SERVER(inode),
1795                                 _nfs4_proc_access(inode, entry),
1796                                 &exception);
1797         } while (exception.retry);
1798         return err;
1799 }
1800
1801 /*
1802  * TODO: For the time being, we don't try to get any attributes
1803  * along with any of the zero-copy operations READ, READDIR,
1804  * READLINK, WRITE.
1805  *
1806  * In the case of the first three, we want to put the GETATTR
1807  * after the read-type operation -- this is because it is hard
1808  * to predict the length of a GETATTR response in v4, and thus
1809  * align the READ data correctly.  This means that the GETATTR
1810  * may end up partially falling into the page cache, and we should
1811  * shift it into the 'tail' of the xdr_buf before processing.
1812  * To do this efficiently, we need to know the total length
1813  * of data received, which doesn't seem to be available outside
1814  * of the RPC layer.
1815  *
1816  * In the case of WRITE, we also want to put the GETATTR after
1817  * the operation -- in this case because we want to make sure
1818  * we get the post-operation mtime and size.  This means that
1819  * we can't use xdr_encode_pages() as written: we need a variant
1820  * of it which would leave room in the 'tail' iovec.
1821  *
1822  * Both of these changes to the XDR layer would in fact be quite
1823  * minor, but I decided to leave them for a subsequent patch.
1824  */
1825 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1826                 unsigned int pgbase, unsigned int pglen)
1827 {
1828         struct nfs4_readlink args = {
1829                 .fh       = NFS_FH(inode),
1830                 .pgbase   = pgbase,
1831                 .pglen    = pglen,
1832                 .pages    = &page,
1833         };
1834         struct rpc_message msg = {
1835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1836                 .rpc_argp = &args,
1837                 .rpc_resp = NULL,
1838         };
1839
1840         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1841 }
1842
1843 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1844                 unsigned int pgbase, unsigned int pglen)
1845 {
1846         struct nfs4_exception exception = { };
1847         int err;
1848         do {
1849                 err = nfs4_handle_exception(NFS_SERVER(inode),
1850                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1851                                 &exception);
1852         } while (exception.retry);
1853         return err;
1854 }
1855
1856 /*
1857  * Got race?
1858  * We will need to arrange for the VFS layer to provide an atomic open.
1859  * Until then, this create/open method is prone to inefficiency and race
1860  * conditions due to the lookup, create, and open VFS calls from sys_open()
1861  * placed on the wire.
1862  *
1863  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1864  * The file will be opened again in the subsequent VFS open call
1865  * (nfs4_proc_file_open).
1866  *
1867  * The open for read will just hang around to be used by any process that
1868  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1869  */
1870
1871 static int
1872 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1873                  int flags, struct nameidata *nd)
1874 {
1875         struct path path = {
1876                 .mnt = nd->mnt,
1877                 .dentry = dentry,
1878         };
1879         struct nfs4_state *state;
1880         struct rpc_cred *cred;
1881         int status = 0;
1882
1883         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1884         if (IS_ERR(cred)) {
1885                 status = PTR_ERR(cred);
1886                 goto out;
1887         }
1888         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1889         put_rpccred(cred);
1890         d_drop(dentry);
1891         if (IS_ERR(state)) {
1892                 status = PTR_ERR(state);
1893                 goto out;
1894         }
1895         d_add(dentry, igrab(state->inode));
1896         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1897         if (flags & O_EXCL) {
1898                 struct nfs_fattr fattr;
1899                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1900                 if (status == 0)
1901                         nfs_setattr_update_inode(state->inode, sattr);
1902                 nfs_post_op_update_inode(state->inode, &fattr);
1903         }
1904         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1905                 status = nfs4_intent_set_file(nd, &path, state);
1906         else
1907                 nfs4_close_state(&path, state, flags);
1908 out:
1909         return status;
1910 }
1911
1912 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1913 {
1914         struct nfs_server *server = NFS_SERVER(dir);
1915         struct nfs_removeargs args = {
1916                 .fh = NFS_FH(dir),
1917                 .name.len = name->len,
1918                 .name.name = name->name,
1919                 .bitmask = server->attr_bitmask,
1920         };
1921         struct nfs_removeres res = {
1922                 .server = server,
1923         };
1924         struct rpc_message msg = {
1925                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1926                 .rpc_argp = &args,
1927                 .rpc_resp = &res,
1928         };
1929         int                     status;
1930
1931         nfs_fattr_init(&res.dir_attr);
1932         status = rpc_call_sync(server->client, &msg, 0);
1933         if (status == 0) {
1934                 update_changeattr(dir, &res.cinfo);
1935                 nfs_post_op_update_inode(dir, &res.dir_attr);
1936         }
1937         return status;
1938 }
1939
1940 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1941 {
1942         struct nfs4_exception exception = { };
1943         int err;
1944         do {
1945                 err = nfs4_handle_exception(NFS_SERVER(dir),
1946                                 _nfs4_proc_remove(dir, name),
1947                                 &exception);
1948         } while (exception.retry);
1949         return err;
1950 }
1951
1952 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1953 {
1954         struct nfs_server *server = NFS_SERVER(dir);
1955         struct nfs_removeargs *args = msg->rpc_argp;
1956         struct nfs_removeres *res = msg->rpc_resp;
1957
1958         args->bitmask = server->attr_bitmask;
1959         res->server = server;
1960         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1961 }
1962
1963 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1964 {
1965         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1966
1967         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1968                 return 0;
1969         update_changeattr(dir, &res->cinfo);
1970         nfs_post_op_update_inode(dir, &res->dir_attr);
1971         return 1;
1972 }
1973
1974 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1975                 struct inode *new_dir, struct qstr *new_name)
1976 {
1977         struct nfs_server *server = NFS_SERVER(old_dir);
1978         struct nfs4_rename_arg arg = {
1979                 .old_dir = NFS_FH(old_dir),
1980                 .new_dir = NFS_FH(new_dir),
1981                 .old_name = old_name,
1982                 .new_name = new_name,
1983                 .bitmask = server->attr_bitmask,
1984         };
1985         struct nfs_fattr old_fattr, new_fattr;
1986         struct nfs4_rename_res res = {
1987                 .server = server,
1988                 .old_fattr = &old_fattr,
1989                 .new_fattr = &new_fattr,
1990         };
1991         struct rpc_message msg = {
1992                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1993                 .rpc_argp = &arg,
1994                 .rpc_resp = &res,
1995         };
1996         int                     status;
1997
1998         nfs_fattr_init(res.old_fattr);
1999         nfs_fattr_init(res.new_fattr);
2000         status = rpc_call_sync(server->client, &msg, 0);
2001
2002         if (!status) {
2003                 update_changeattr(old_dir, &res.old_cinfo);
2004                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2005                 update_changeattr(new_dir, &res.new_cinfo);
2006                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2007         }
2008         return status;
2009 }
2010
2011 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2012                 struct inode *new_dir, struct qstr *new_name)
2013 {
2014         struct nfs4_exception exception = { };
2015         int err;
2016         do {
2017                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2018                                 _nfs4_proc_rename(old_dir, old_name,
2019                                         new_dir, new_name),
2020                                 &exception);
2021         } while (exception.retry);
2022         return err;
2023 }
2024
2025 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2026 {
2027         struct nfs_server *server = NFS_SERVER(inode);
2028         struct nfs4_link_arg arg = {
2029                 .fh     = NFS_FH(inode),
2030                 .dir_fh = NFS_FH(dir),
2031                 .name   = name,
2032                 .bitmask = server->attr_bitmask,
2033         };
2034         struct nfs_fattr fattr, dir_attr;
2035         struct nfs4_link_res res = {
2036                 .server = server,
2037                 .fattr = &fattr,
2038                 .dir_attr = &dir_attr,
2039         };
2040         struct rpc_message msg = {
2041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2042                 .rpc_argp = &arg,
2043                 .rpc_resp = &res,
2044         };
2045         int                     status;
2046
2047         nfs_fattr_init(res.fattr);
2048         nfs_fattr_init(res.dir_attr);
2049         status = rpc_call_sync(server->client, &msg, 0);
2050         if (!status) {
2051                 update_changeattr(dir, &res.cinfo);
2052                 nfs_post_op_update_inode(dir, res.dir_attr);
2053                 nfs_post_op_update_inode(inode, res.fattr);
2054         }
2055
2056         return status;
2057 }
2058
2059 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2060 {
2061         struct nfs4_exception exception = { };
2062         int err;
2063         do {
2064                 err = nfs4_handle_exception(NFS_SERVER(inode),
2065                                 _nfs4_proc_link(inode, dir, name),
2066                                 &exception);
2067         } while (exception.retry);
2068         return err;
2069 }
2070
2071 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2072                 struct page *page, unsigned int len, struct iattr *sattr)
2073 {
2074         struct nfs_server *server = NFS_SERVER(dir);
2075         struct nfs_fh fhandle;
2076         struct nfs_fattr fattr, dir_fattr;
2077         struct nfs4_create_arg arg = {
2078                 .dir_fh = NFS_FH(dir),
2079                 .server = server,
2080                 .name = &dentry->d_name,
2081                 .attrs = sattr,
2082                 .ftype = NF4LNK,
2083                 .bitmask = server->attr_bitmask,
2084         };
2085         struct nfs4_create_res res = {
2086                 .server = server,
2087                 .fh = &fhandle,
2088                 .fattr = &fattr,
2089                 .dir_fattr = &dir_fattr,
2090         };
2091         struct rpc_message msg = {
2092                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2093                 .rpc_argp = &arg,
2094                 .rpc_resp = &res,
2095         };
2096         int                     status;
2097
2098         if (len > NFS4_MAXPATHLEN)
2099                 return -ENAMETOOLONG;
2100
2101         arg.u.symlink.pages = &page;
2102         arg.u.symlink.len = len;
2103         nfs_fattr_init(&fattr);
2104         nfs_fattr_init(&dir_fattr);
2105
2106         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2107         if (!status) {
2108                 update_changeattr(dir, &res.dir_cinfo);
2109                 nfs_post_op_update_inode(dir, res.dir_fattr);
2110                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2111         }
2112         return status;
2113 }
2114
2115 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2116                 struct page *page, unsigned int len, struct iattr *sattr)
2117 {
2118         struct nfs4_exception exception = { };
2119         int err;
2120         do {
2121                 err = nfs4_handle_exception(NFS_SERVER(dir),
2122                                 _nfs4_proc_symlink(dir, dentry, page,
2123                                                         len, sattr),
2124                                 &exception);
2125         } while (exception.retry);
2126         return err;
2127 }
2128
2129 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2130                 struct iattr *sattr)
2131 {
2132         struct nfs_server *server = NFS_SERVER(dir);
2133         struct nfs_fh fhandle;
2134         struct nfs_fattr fattr, dir_fattr;
2135         struct nfs4_create_arg arg = {
2136                 .dir_fh = NFS_FH(dir),
2137                 .server = server,
2138                 .name = &dentry->d_name,
2139                 .attrs = sattr,
2140                 .ftype = NF4DIR,
2141                 .bitmask = server->attr_bitmask,
2142         };
2143         struct nfs4_create_res res = {
2144                 .server = server,
2145                 .fh = &fhandle,
2146                 .fattr = &fattr,
2147                 .dir_fattr = &dir_fattr,
2148         };
2149         struct rpc_message msg = {
2150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2151                 .rpc_argp = &arg,
2152                 .rpc_resp = &res,
2153         };
2154         int                     status;
2155
2156         nfs_fattr_init(&fattr);
2157         nfs_fattr_init(&dir_fattr);
2158
2159         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2160         if (!status) {
2161                 update_changeattr(dir, &res.dir_cinfo);
2162                 nfs_post_op_update_inode(dir, res.dir_fattr);
2163                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2164         }
2165         return status;
2166 }
2167
2168 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2169                 struct iattr *sattr)
2170 {
2171         struct nfs4_exception exception = { };
2172         int err;
2173         do {
2174                 err = nfs4_handle_exception(NFS_SERVER(dir),
2175                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2176                                 &exception);
2177         } while (exception.retry);
2178         return err;
2179 }
2180
2181 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2182                   u64 cookie, struct page *page, unsigned int count, int plus)
2183 {
2184         struct inode            *dir = dentry->d_inode;
2185         struct nfs4_readdir_arg args = {
2186                 .fh = NFS_FH(dir),
2187                 .pages = &page,
2188                 .pgbase = 0,
2189                 .count = count,
2190                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2191         };
2192         struct nfs4_readdir_res res;
2193         struct rpc_message msg = {
2194                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2195                 .rpc_argp = &args,
2196                 .rpc_resp = &res,
2197                 .rpc_cred = cred,
2198         };
2199         int                     status;
2200
2201         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2202                         dentry->d_parent->d_name.name,
2203                         dentry->d_name.name,
2204                         (unsigned long long)cookie);
2205         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2206         res.pgbase = args.pgbase;
2207         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2208         if (status == 0)
2209                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2210
2211         nfs_invalidate_atime(dir);
2212
2213         dprintk("%s: returns %d\n", __FUNCTION__, status);
2214         return status;
2215 }
2216
2217 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2218                   u64 cookie, struct page *page, unsigned int count, int plus)
2219 {
2220         struct nfs4_exception exception = { };
2221         int err;
2222         do {
2223                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2224                                 _nfs4_proc_readdir(dentry, cred, cookie,
2225                                         page, count, plus),
2226                                 &exception);
2227         } while (exception.retry);
2228         return err;
2229 }
2230
2231 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2232                 struct iattr *sattr, dev_t rdev)
2233 {
2234         struct nfs_server *server = NFS_SERVER(dir);
2235         struct nfs_fh fh;
2236         struct nfs_fattr fattr, dir_fattr;
2237         struct nfs4_create_arg arg = {
2238                 .dir_fh = NFS_FH(dir),
2239                 .server = server,
2240                 .name = &dentry->d_name,
2241                 .attrs = sattr,
2242                 .bitmask = server->attr_bitmask,
2243         };
2244         struct nfs4_create_res res = {
2245                 .server = server,
2246                 .fh = &fh,
2247                 .fattr = &fattr,
2248                 .dir_fattr = &dir_fattr,
2249         };
2250         struct rpc_message msg = {
2251                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2252                 .rpc_argp = &arg,
2253                 .rpc_resp = &res,
2254         };
2255         int                     status;
2256         int                     mode = sattr->ia_mode;
2257
2258         nfs_fattr_init(&fattr);
2259         nfs_fattr_init(&dir_fattr);
2260
2261         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2262         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2263         if (S_ISFIFO(mode))
2264                 arg.ftype = NF4FIFO;
2265         else if (S_ISBLK(mode)) {
2266                 arg.ftype = NF4BLK;
2267                 arg.u.device.specdata1 = MAJOR(rdev);
2268                 arg.u.device.specdata2 = MINOR(rdev);
2269         }
2270         else if (S_ISCHR(mode)) {
2271                 arg.ftype = NF4CHR;
2272                 arg.u.device.specdata1 = MAJOR(rdev);
2273                 arg.u.device.specdata2 = MINOR(rdev);
2274         }
2275         else
2276                 arg.ftype = NF4SOCK;
2277
2278         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2279         if (status == 0) {
2280                 update_changeattr(dir, &res.dir_cinfo);
2281                 nfs_post_op_update_inode(dir, res.dir_fattr);
2282                 status = nfs_instantiate(dentry, &fh, &fattr);
2283         }
2284         return status;
2285 }
2286
2287 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2288                 struct iattr *sattr, dev_t rdev)
2289 {
2290         struct nfs4_exception exception = { };
2291         int err;
2292         do {
2293                 err = nfs4_handle_exception(NFS_SERVER(dir),
2294                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2295                                 &exception);
2296         } while (exception.retry);
2297         return err;
2298 }
2299
2300 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2301                  struct nfs_fsstat *fsstat)
2302 {
2303         struct nfs4_statfs_arg args = {
2304                 .fh = fhandle,
2305                 .bitmask = server->attr_bitmask,
2306         };
2307         struct rpc_message msg = {
2308                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2309                 .rpc_argp = &args,
2310                 .rpc_resp = fsstat,
2311         };
2312
2313         nfs_fattr_init(fsstat->fattr);
2314         return rpc_call_sync(server->client, &msg, 0);
2315 }
2316
2317 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2318 {
2319         struct nfs4_exception exception = { };
2320         int err;
2321         do {
2322                 err = nfs4_handle_exception(server,
2323                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2324                                 &exception);
2325         } while (exception.retry);
2326         return err;
2327 }
2328
2329 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2330                 struct nfs_fsinfo *fsinfo)
2331 {
2332         struct nfs4_fsinfo_arg args = {
2333                 .fh = fhandle,
2334                 .bitmask = server->attr_bitmask,
2335         };
2336         struct rpc_message msg = {
2337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2338                 .rpc_argp = &args,
2339                 .rpc_resp = fsinfo,
2340         };
2341
2342         return rpc_call_sync(server->client, &msg, 0);
2343 }
2344
2345 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2346 {
2347         struct nfs4_exception exception = { };
2348         int err;
2349
2350         do {
2351                 err = nfs4_handle_exception(server,
2352                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2353                                 &exception);
2354         } while (exception.retry);
2355         return err;
2356 }
2357
2358 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2359 {
2360         nfs_fattr_init(fsinfo->fattr);
2361         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2362 }
2363
2364 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2365                 struct nfs_pathconf *pathconf)
2366 {
2367         struct nfs4_pathconf_arg args = {
2368                 .fh = fhandle,
2369                 .bitmask = server->attr_bitmask,
2370         };
2371         struct rpc_message msg = {
2372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2373                 .rpc_argp = &args,
2374                 .rpc_resp = pathconf,
2375         };
2376
2377         /* None of the pathconf attributes are mandatory to implement */
2378         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2379                 memset(pathconf, 0, sizeof(*pathconf));
2380                 return 0;
2381         }
2382
2383         nfs_fattr_init(pathconf->fattr);
2384         return rpc_call_sync(server->client, &msg, 0);
2385 }
2386
2387 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2388                 struct nfs_pathconf *pathconf)
2389 {
2390         struct nfs4_exception exception = { };
2391         int err;
2392
2393         do {
2394                 err = nfs4_handle_exception(server,
2395                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2396                                 &exception);
2397         } while (exception.retry);
2398         return err;
2399 }
2400
2401 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2402 {
2403         struct nfs_server *server = NFS_SERVER(data->inode);
2404
2405         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2406                 rpc_restart_call(task);
2407                 return -EAGAIN;
2408         }
2409
2410         nfs_invalidate_atime(data->inode);
2411         if (task->tk_status > 0)
2412                 renew_lease(server, data->timestamp);
2413         return 0;
2414 }
2415
2416 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2417 {
2418         struct rpc_message msg = {
2419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2420                 .rpc_argp = &data->args,
2421                 .rpc_resp = &data->res,
2422                 .rpc_cred = data->cred,
2423         };
2424
2425         data->timestamp   = jiffies;
2426
2427         rpc_call_setup(&data->task, &msg, 0);
2428 }
2429
2430 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2431 {
2432         struct inode *inode = data->inode;
2433
2434         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2435                 rpc_restart_call(task);
2436                 return -EAGAIN;
2437         }
2438         if (task->tk_status >= 0) {
2439                 renew_lease(NFS_SERVER(inode), data->timestamp);
2440                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2441         }
2442         return 0;
2443 }
2444
2445 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2446 {
2447         struct rpc_message msg = {
2448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2449                 .rpc_argp = &data->args,
2450                 .rpc_resp = &data->res,
2451                 .rpc_cred = data->cred,
2452         };
2453         struct inode *inode = data->inode;
2454         struct nfs_server *server = NFS_SERVER(inode);
2455         int stable;
2456
2457         if (how & FLUSH_STABLE) {
2458                 if (!NFS_I(inode)->ncommit)
2459                         stable = NFS_FILE_SYNC;
2460                 else
2461                         stable = NFS_DATA_SYNC;
2462         } else
2463                 stable = NFS_UNSTABLE;
2464         data->args.stable = stable;
2465         data->args.bitmask = server->attr_bitmask;
2466         data->res.server = server;
2467
2468         data->timestamp   = jiffies;
2469
2470         /* Finalize the task. */
2471         rpc_call_setup(&data->task, &msg, 0);
2472 }
2473
2474 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2475 {
2476         struct inode *inode = data->inode;
2477
2478         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2479                 rpc_restart_call(task);
2480                 return -EAGAIN;
2481         }
2482         nfs_refresh_inode(inode, data->res.fattr);
2483         return 0;
2484 }
2485
2486 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2487 {
2488         struct rpc_message msg = {
2489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2490                 .rpc_argp = &data->args,
2491                 .rpc_resp = &data->res,
2492                 .rpc_cred = data->cred,
2493         };
2494         struct nfs_server *server = NFS_SERVER(data->inode);
2495
2496         data->args.bitmask = server->attr_bitmask;
2497         data->res.server = server;
2498
2499         rpc_call_setup(&data->task, &msg, 0);
2500 }
2501
2502 /*
2503  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2504  * standalone procedure for queueing an asynchronous RENEW.
2505  */
2506 static void nfs4_renew_done(struct rpc_task *task, void *data)
2507 {
2508         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2509         unsigned long timestamp = (unsigned long)data;
2510
2511         if (task->tk_status < 0) {
2512                 switch (task->tk_status) {
2513                         case -NFS4ERR_STALE_CLIENTID:
2514                         case -NFS4ERR_EXPIRED:
2515                         case -NFS4ERR_CB_PATH_DOWN:
2516                                 nfs4_schedule_state_recovery(clp);
2517                 }
2518                 return;
2519         }
2520         spin_lock(&clp->cl_lock);
2521         if (time_before(clp->cl_last_renewal,timestamp))
2522                 clp->cl_last_renewal = timestamp;
2523         spin_unlock(&clp->cl_lock);
2524 }
2525
2526 static const struct rpc_call_ops nfs4_renew_ops = {
2527         .rpc_call_done = nfs4_renew_done,
2528 };
2529
2530 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2531 {
2532         struct rpc_message msg = {
2533                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2534                 .rpc_argp       = clp,
2535                 .rpc_cred       = cred,
2536         };
2537
2538         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2539                         &nfs4_renew_ops, (void *)jiffies);
2540 }
2541
2542 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2543 {
2544         struct rpc_message msg = {
2545                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2546                 .rpc_argp       = clp,
2547                 .rpc_cred       = cred,
2548         };
2549         unsigned long now = jiffies;
2550         int status;
2551
2552         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2553         if (status < 0)
2554                 return status;
2555         spin_lock(&clp->cl_lock);
2556         if (time_before(clp->cl_last_renewal,now))
2557                 clp->cl_last_renewal = now;
2558         spin_unlock(&clp->cl_lock);
2559         return 0;
2560 }
2561
2562 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2563 {
2564         return (server->caps & NFS_CAP_ACLS)
2565                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2566                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2567 }
2568
2569 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2570  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2571  * the stack.
2572  */
2573 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2574
2575 static void buf_to_pages(const void *buf, size_t buflen,
2576                 struct page **pages, unsigned int *pgbase)
2577 {
2578         const void *p = buf;
2579
2580         *pgbase = offset_in_page(buf);
2581         p -= *pgbase;
2582         while (p < buf + buflen) {
2583                 *(pages++) = virt_to_page(p);
2584                 p += PAGE_CACHE_SIZE;
2585         }
2586 }
2587
2588 struct nfs4_cached_acl {
2589         int cached;
2590         size_t len;
2591         char data[0];
2592 };
2593
2594 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2595 {
2596         struct nfs_inode *nfsi = NFS_I(inode);
2597
2598         spin_lock(&inode->i_lock);
2599         kfree(nfsi->nfs4_acl);
2600         nfsi->nfs4_acl = acl;
2601         spin_unlock(&inode->i_lock);
2602 }
2603
2604 static void nfs4_zap_acl_attr(struct inode *inode)
2605 {
2606         nfs4_set_cached_acl(inode, NULL);
2607 }
2608
2609 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2610 {
2611         struct nfs_inode *nfsi = NFS_I(inode);
2612         struct nfs4_cached_acl *acl;
2613         int ret = -ENOENT;
2614
2615         spin_lock(&inode->i_lock);
2616         acl = nfsi->nfs4_acl;
2617         if (acl == NULL)
2618                 goto out;
2619         if (buf == NULL) /* user is just asking for length */
2620                 goto out_len;
2621         if (acl->cached == 0)
2622                 goto out;
2623         ret = -ERANGE; /* see getxattr(2) man page */
2624         if (acl->len > buflen)
2625                 goto out;
2626         memcpy(buf, acl->data, acl->len);
2627 out_len:
2628         ret = acl->len;
2629 out:
2630         spin_unlock(&inode->i_lock);
2631         return ret;
2632 }
2633
2634 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2635 {
2636         struct nfs4_cached_acl *acl;
2637
2638         if (buf && acl_len <= PAGE_SIZE) {
2639                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2640                 if (acl == NULL)
2641                         goto out;
2642                 acl->cached = 1;
2643                 memcpy(acl->data, buf, acl_len);
2644         } else {
2645                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2646                 if (acl == NULL)
2647                         goto out;
2648                 acl->cached = 0;
2649         }
2650         acl->len = acl_len;
2651 out:
2652         nfs4_set_cached_acl(inode, acl);
2653 }
2654
2655 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2656 {
2657         struct page *pages[NFS4ACL_MAXPAGES];
2658         struct nfs_getaclargs args = {
2659                 .fh = NFS_FH(inode),
2660                 .acl_pages = pages,
2661                 .acl_len = buflen,
2662         };
2663         size_t resp_len = buflen;
2664         void *resp_buf;
2665         struct rpc_message msg = {
2666                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2667                 .rpc_argp = &args,
2668                 .rpc_resp = &resp_len,
2669         };
2670         struct page *localpage = NULL;
2671         int ret;
2672
2673         if (buflen < PAGE_SIZE) {
2674                 /* As long as we're doing a round trip to the server anyway,
2675                  * let's be prepared for a page of acl data. */
2676                 localpage = alloc_page(GFP_KERNEL);
2677                 resp_buf = page_address(localpage);
2678                 if (localpage == NULL)
2679                         return -ENOMEM;
2680                 args.acl_pages[0] = localpage;
2681                 args.acl_pgbase = 0;
2682                 resp_len = args.acl_len = PAGE_SIZE;
2683         } else {
2684                 resp_buf = buf;
2685                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2686         }
2687         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2688         if (ret)
2689                 goto out_free;
2690         if (resp_len > args.acl_len)
2691                 nfs4_write_cached_acl(inode, NULL, resp_len);
2692         else
2693                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2694         if (buf) {
2695                 ret = -ERANGE;
2696                 if (resp_len > buflen)
2697                         goto out_free;
2698                 if (localpage)
2699                         memcpy(buf, resp_buf, resp_len);
2700         }
2701         ret = resp_len;
2702 out_free:
2703         if (localpage)
2704                 __free_page(localpage);
2705         return ret;
2706 }
2707
2708 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2709 {
2710         struct nfs4_exception exception = { };
2711         ssize_t ret;
2712         do {
2713                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2714                 if (ret >= 0)
2715                         break;
2716                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2717         } while (exception.retry);
2718         return ret;
2719 }
2720
2721 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2722 {
2723         struct nfs_server *server = NFS_SERVER(inode);
2724         int ret;
2725
2726         if (!nfs4_server_supports_acls(server))
2727                 return -EOPNOTSUPP;
2728         ret = nfs_revalidate_inode(server, inode);
2729         if (ret < 0)
2730                 return ret;
2731         ret = nfs4_read_cached_acl(inode, buf, buflen);
2732         if (ret != -ENOENT)
2733                 return ret;
2734         return nfs4_get_acl_uncached(inode, buf, buflen);
2735 }
2736
2737 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2738 {
2739         struct nfs_server *server = NFS_SERVER(inode);
2740         struct page *pages[NFS4ACL_MAXPAGES];
2741         struct nfs_setaclargs arg = {
2742                 .fh             = NFS_FH(inode),
2743                 .acl_pages      = pages,
2744                 .acl_len        = buflen,
2745         };
2746         struct rpc_message msg = {
2747                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2748                 .rpc_argp       = &arg,
2749                 .rpc_resp       = NULL,
2750         };
2751         int ret;
2752
2753         if (!nfs4_server_supports_acls(server))
2754                 return -EOPNOTSUPP;
2755         nfs_inode_return_delegation(inode);
2756         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2757         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2758         nfs_zap_caches(inode);
2759         return ret;
2760 }
2761
2762 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2763 {
2764         struct nfs4_exception exception = { };
2765         int err;
2766         do {
2767                 err = nfs4_handle_exception(NFS_SERVER(inode),
2768                                 __nfs4_proc_set_acl(inode, buf, buflen),
2769                                 &exception);
2770         } while (exception.retry);
2771         return err;
2772 }
2773
2774 static int
2775 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2776 {
2777         struct nfs_client *clp = server->nfs_client;
2778
2779         if (!clp || task->tk_status >= 0)
2780                 return 0;
2781         switch(task->tk_status) {
2782                 case -NFS4ERR_STALE_CLIENTID:
2783                 case -NFS4ERR_STALE_STATEID:
2784                 case -NFS4ERR_EXPIRED:
2785                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2786                         nfs4_schedule_state_recovery(clp);
2787                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2788                                 rpc_wake_up_task(task);
2789                         task->tk_status = 0;
2790                         return -EAGAIN;
2791                 case -NFS4ERR_DELAY:
2792                         nfs_inc_server_stats((struct nfs_server *) server,
2793                                                 NFSIOS_DELAY);
2794                 case -NFS4ERR_GRACE:
2795                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2796                         task->tk_status = 0;
2797                         return -EAGAIN;
2798                 case -NFS4ERR_OLD_STATEID:
2799                         task->tk_status = 0;
2800                         return -EAGAIN;
2801         }
2802         task->tk_status = nfs4_map_errors(task->tk_status);
2803         return 0;
2804 }
2805
2806 static int nfs4_wait_bit_interruptible(void *word)
2807 {
2808         if (signal_pending(current))
2809                 return -ERESTARTSYS;
2810         schedule();
2811         return 0;
2812 }
2813
2814 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2815 {
2816         sigset_t oldset;
2817         int res;
2818
2819         might_sleep();
2820
2821         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2822
2823         rpc_clnt_sigmask(clnt, &oldset);
2824         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2825                         nfs4_wait_bit_interruptible,
2826                         TASK_INTERRUPTIBLE);
2827         rpc_clnt_sigunmask(clnt, &oldset);
2828
2829         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2830         return res;
2831 }
2832
2833 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2834 {
2835         sigset_t oldset;
2836         int res = 0;
2837
2838         might_sleep();
2839
2840         if (*timeout <= 0)
2841                 *timeout = NFS4_POLL_RETRY_MIN;
2842         if (*timeout > NFS4_POLL_RETRY_MAX)
2843                 *timeout = NFS4_POLL_RETRY_MAX;
2844         rpc_clnt_sigmask(clnt, &oldset);
2845         if (clnt->cl_intr) {
2846                 schedule_timeout_interruptible(*timeout);
2847                 if (signalled())
2848                         res = -ERESTARTSYS;
2849         } else
2850                 schedule_timeout_uninterruptible(*timeout);
2851         rpc_clnt_sigunmask(clnt, &oldset);
2852         *timeout <<= 1;
2853         return res;
2854 }
2855
2856 /* This is the error handling routine for processes that are allowed
2857  * to sleep.
2858  */
2859 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2860 {
2861         struct nfs_client *clp = server->nfs_client;
2862         int ret = errorcode;
2863
2864         exception->retry = 0;
2865         switch(errorcode) {
2866                 case 0:
2867                         return 0;
2868                 case -NFS4ERR_STALE_CLIENTID:
2869                 case -NFS4ERR_STALE_STATEID:
2870                 case -NFS4ERR_EXPIRED:
2871                         nfs4_schedule_state_recovery(clp);
2872                         ret = nfs4_wait_clnt_recover(server->client, clp);
2873                         if (ret == 0)
2874                                 exception->retry = 1;
2875                         break;
2876                 case -NFS4ERR_FILE_OPEN:
2877                 case -NFS4ERR_GRACE:
2878                 case -NFS4ERR_DELAY:
2879                         ret = nfs4_delay(server->client, &exception->timeout);
2880                         if (ret != 0)
2881                                 break;
2882                 case -NFS4ERR_OLD_STATEID:
2883                         exception->retry = 1;
2884         }
2885         /* We failed to handle the error */
2886         return nfs4_map_errors(ret);
2887 }
2888
2889 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2890 {
2891         nfs4_verifier sc_verifier;
2892         struct nfs4_setclientid setclientid = {
2893                 .sc_verifier = &sc_verifier,
2894                 .sc_prog = program,
2895         };
2896         struct rpc_message msg = {
2897                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2898                 .rpc_argp = &setclientid,
2899                 .rpc_resp = clp,
2900                 .rpc_cred = cred,
2901         };
2902         __be32 *p;
2903         int loop = 0;
2904         int status;
2905
2906         p = (__be32*)sc_verifier.data;
2907         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2908         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2909
2910         for(;;) {
2911                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2912                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2913                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2914                                 cred->cr_ops->cr_name,
2915                                 clp->cl_id_uniquifier);
2916                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2917                                 sizeof(setclientid.sc_netid), "tcp");
2918                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2919                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2920                                 clp->cl_ipaddr, port >> 8, port & 255);
2921
2922                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2923                 if (status != -NFS4ERR_CLID_INUSE)
2924                         break;
2925                 if (signalled())
2926                         break;
2927                 if (loop++ & 1)
2928                         ssleep(clp->cl_lease_time + 1);
2929                 else
2930                         if (++clp->cl_id_uniquifier == 0)
2931                                 break;
2932         }
2933         return status;
2934 }
2935
2936 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2937 {
2938         struct nfs_fsinfo fsinfo;
2939         struct rpc_message msg = {
2940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2941                 .rpc_argp = clp,
2942                 .rpc_resp = &fsinfo,
2943                 .rpc_cred = cred,
2944         };
2945         unsigned long now;
2946         int status;
2947
2948         now = jiffies;
2949         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2950         if (status == 0) {
2951                 spin_lock(&clp->cl_lock);
2952                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2953                 clp->cl_last_renewal = now;
2954                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2955                 spin_unlock(&clp->cl_lock);
2956         }
2957         return status;
2958 }
2959
2960 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2961 {
2962         long timeout;
2963         int err;
2964         do {
2965                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2966                 switch (err) {
2967                         case 0:
2968                                 return err;
2969                         case -NFS4ERR_RESOURCE:
2970                                 /* The IBM lawyers misread another document! */
2971                         case -NFS4ERR_DELAY:
2972                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2973                 }
2974         } while (err == 0);
2975         return err;
2976 }
2977
2978 struct nfs4_delegreturndata {
2979         struct nfs4_delegreturnargs args;
2980         struct nfs4_delegreturnres res;
2981         struct nfs_fh fh;
2982         nfs4_stateid stateid;
2983         struct rpc_cred *cred;
2984         unsigned long timestamp;
2985         struct nfs_fattr fattr;
2986         int rpc_status;
2987 };
2988
2989 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2990 {
2991         struct nfs4_delegreturndata *data = calldata;
2992         struct rpc_message msg = {
2993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2994                 .rpc_argp = &data->args,
2995                 .rpc_resp = &data->res,
2996                 .rpc_cred = data->cred,
2997         };
2998         nfs_fattr_init(data->res.fattr);
2999         rpc_call_setup(task, &msg, 0);
3000 }
3001
3002 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3003 {
3004         struct nfs4_delegreturndata *data = calldata;
3005         data->rpc_status = task->tk_status;
3006         if (data->rpc_status == 0)
3007                 renew_lease(data->res.server, data->timestamp);
3008 }
3009
3010 static void nfs4_delegreturn_release(void *calldata)
3011 {
3012         struct nfs4_delegreturndata *data = calldata;
3013
3014         put_rpccred(data->cred);
3015         kfree(calldata);
3016 }
3017
3018 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3019         .rpc_call_prepare = nfs4_delegreturn_prepare,
3020         .rpc_call_done = nfs4_delegreturn_done,
3021         .rpc_release = nfs4_delegreturn_release,
3022 };
3023
3024 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3025 {
3026         struct nfs4_delegreturndata *data;
3027         struct nfs_server *server = NFS_SERVER(inode);
3028         struct rpc_task *task;
3029         int status;
3030
3031         data = kmalloc(sizeof(*data), GFP_KERNEL);
3032         if (data == NULL)
3033                 return -ENOMEM;
3034         data->args.fhandle = &data->fh;
3035         data->args.stateid = &data->stateid;
3036         data->args.bitmask = server->attr_bitmask;
3037         nfs_copy_fh(&data->fh, NFS_FH(inode));
3038         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3039         data->res.fattr = &data->fattr;
3040         data->res.server = server;
3041         data->cred = get_rpccred(cred);
3042         data->timestamp = jiffies;
3043         data->rpc_status = 0;
3044
3045         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3046         if (IS_ERR(task))
3047                 return PTR_ERR(task);
3048         status = nfs4_wait_for_completion_rpc_task(task);
3049         if (status == 0) {
3050                 status = data->rpc_status;
3051                 if (status == 0)
3052                         nfs_refresh_inode(inode, &data->fattr);
3053         }
3054         rpc_put_task(task);
3055         return status;
3056 }
3057
3058 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3059 {
3060         struct nfs_server *server = NFS_SERVER(inode);
3061         struct nfs4_exception exception = { };
3062         int err;
3063         do {
3064                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3065                 switch (err) {
3066                         case -NFS4ERR_STALE_STATEID:
3067                         case -NFS4ERR_EXPIRED:
3068                         case 0:
3069                                 return 0;
3070                 }
3071                 err = nfs4_handle_exception(server, err, &exception);
3072         } while (exception.retry);
3073         return err;
3074 }
3075
3076 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3077 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3078
3079 /*
3080  * sleep, with exponential backoff, and retry the LOCK operation.
3081  */
3082 static unsigned long
3083 nfs4_set_lock_task_retry(unsigned long timeout)
3084 {
3085         schedule_timeout_interruptible(timeout);
3086         timeout <<= 1;
3087         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3088                 return NFS4_LOCK_MAXTIMEOUT;
3089         return timeout;
3090 }
3091
3092 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3093 {
3094         struct inode *inode = state->inode;
3095         struct nfs_server *server = NFS_SERVER(inode);
3096         struct nfs_client *clp = server->nfs_client;
3097         struct nfs_lockt_args arg = {
3098                 .fh = NFS_FH(inode),
3099                 .fl = request,
3100         };
3101         struct nfs_lockt_res res = {
3102                 .denied = request,
3103         };
3104         struct rpc_message msg = {
3105                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3106                 .rpc_argp       = &arg,
3107                 .rpc_resp       = &res,
3108                 .rpc_cred       = state->owner->so_cred,
3109         };
3110         struct nfs4_lock_state *lsp;
3111         int status;
3112
3113         down_read(&clp->cl_sem);
3114         arg.lock_owner.clientid = clp->cl_clientid;
3115         status = nfs4_set_lock_state(state, request);
3116         if (status != 0)
3117                 goto out;
3118         lsp = request->fl_u.nfs4_fl.owner;
3119         arg.lock_owner.id = lsp->ls_id.id;
3120         status = rpc_call_sync(server->client, &msg, 0);
3121         switch (status) {
3122                 case 0:
3123                         request->fl_type = F_UNLCK;
3124                         break;
3125                 case -NFS4ERR_DENIED:
3126                         status = 0;
3127         }
3128         request->fl_ops->fl_release_private(request);
3129 out:
3130         up_read(&clp->cl_sem);
3131         return status;
3132 }
3133
3134 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3135 {
3136         struct nfs4_exception exception = { };
3137         int err;
3138
3139         do {
3140                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3141                                 _nfs4_proc_getlk(state, cmd, request),
3142                                 &exception);
3143         } while (exception.retry);
3144         return err;
3145 }
3146
3147 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3148 {
3149         int res = 0;
3150         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3151                 case FL_POSIX:
3152                         res = posix_lock_file_wait(file, fl);
3153                         break;
3154                 case FL_FLOCK:
3155                         res = flock_lock_file_wait(file, fl);
3156                         break;
3157                 default:
3158                         BUG();
3159         }
3160         return res;
3161 }
3162
3163 struct nfs4_unlockdata {
3164         struct nfs_locku_args arg;
3165         struct nfs_locku_res res;
3166         struct nfs4_lock_state *lsp;
3167         struct nfs_open_context *ctx;
3168         struct file_lock fl;
3169         const struct nfs_server *server;
3170         unsigned long timestamp;
3171 };
3172
3173 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3174                 struct nfs_open_context *ctx,
3175                 struct nfs4_lock_state *lsp,
3176                 struct nfs_seqid *seqid)
3177 {
3178         struct nfs4_unlockdata *p;
3179         struct inode *inode = lsp->ls_state->inode;
3180
3181         p = kmalloc(sizeof(*p), GFP_KERNEL);
3182         if (p == NULL)
3183                 return NULL;
3184         p->arg.fh = NFS_FH(inode);
3185         p->arg.fl = &p->fl;
3186         p->arg.seqid = seqid;
3187         p->arg.stateid = &lsp->ls_stateid;
3188         p->lsp = lsp;
3189         atomic_inc(&lsp->ls_count);
3190         /* Ensure we don't close file until we're done freeing locks! */
3191         p->ctx = get_nfs_open_context(ctx);
3192         memcpy(&p->fl, fl, sizeof(p->fl));
3193         p->server = NFS_SERVER(inode);
3194         return p;
3195 }
3196
3197 static void nfs4_locku_release_calldata(void *data)
3198 {
3199         struct nfs4_unlockdata *calldata = data;
3200         nfs_free_seqid(calldata->arg.seqid);
3201         nfs4_put_lock_state(calldata->lsp);
3202         put_nfs_open_context(calldata->ctx);
3203         kfree(calldata);
3204 }
3205
3206 static void nfs4_locku_done(struct rpc_task *task, void *data)
3207 {
3208         struct nfs4_unlockdata *calldata = data;
3209
3210         if (RPC_ASSASSINATED(task))
3211                 return;
3212         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3213         switch (task->tk_status) {
3214                 case 0:
3215                         memcpy(calldata->lsp->ls_stateid.data,
3216                                         calldata->res.stateid.data,
3217                                         sizeof(calldata->lsp->ls_stateid.data));
3218                         renew_lease(calldata->server, calldata->timestamp);
3219                         break;
3220                 case -NFS4ERR_STALE_STATEID:
3221                 case -NFS4ERR_EXPIRED:
3222                         break;
3223                 default:
3224                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3225                                 rpc_restart_call(task);
3226         }
3227 }
3228
3229 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3230 {
3231         struct nfs4_unlockdata *calldata = data;
3232         struct rpc_message msg = {
3233                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3234                 .rpc_argp       = &calldata->arg,
3235                 .rpc_resp       = &calldata->res,
3236                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3237         };
3238
3239         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3240                 return;
3241         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3242                 /* Note: exit _without_ running nfs4_locku_done */
3243                 task->tk_action = NULL;
3244                 return;
3245         }
3246         calldata->timestamp = jiffies;
3247         rpc_call_setup(task, &msg, 0);
3248 }
3249
3250 static const struct rpc_call_ops nfs4_locku_ops = {
3251         .rpc_call_prepare = nfs4_locku_prepare,
3252         .rpc_call_done = nfs4_locku_done,
3253         .rpc_release = nfs4_locku_release_calldata,
3254 };
3255
3256 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3257                 struct nfs_open_context *ctx,
3258                 struct nfs4_lock_state *lsp,
3259                 struct nfs_seqid *seqid)
3260 {
3261         struct nfs4_unlockdata *data;
3262
3263         /* Ensure this is an unlock - when canceling a lock, the
3264          * canceled lock is passed in, and it won't be an unlock.
3265          */
3266         fl->fl_type = F_UNLCK;
3267
3268         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3269         if (data == NULL) {
3270                 nfs_free_seqid(seqid);
3271                 return ERR_PTR(-ENOMEM);
3272         }
3273
3274         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3275 }
3276
3277 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3278 {
3279         struct nfs_seqid *seqid;
3280         struct nfs4_lock_state *lsp;
3281         struct rpc_task *task;
3282         int status = 0;
3283
3284         status = nfs4_set_lock_state(state, request);
3285         /* Unlock _before_ we do the RPC call */
3286         request->fl_flags |= FL_EXISTS;
3287         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3288                 goto out;
3289         if (status != 0)
3290                 goto out;
3291         /* Is this a delegated lock? */
3292         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3293                 goto out;
3294         lsp = request->fl_u.nfs4_fl.owner;
3295         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3296         status = -ENOMEM;
3297         if (seqid == NULL)
3298                 goto out;
3299         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3300         status = PTR_ERR(task);
3301         if (IS_ERR(task))
3302                 goto out;
3303         status = nfs4_wait_for_completion_rpc_task(task);
3304         rpc_put_task(task);
3305 out:
3306         return status;
3307 }
3308
3309 struct nfs4_lockdata {
3310         struct nfs_lock_args arg;
3311         struct nfs_lock_res res;
3312         struct nfs4_lock_state *lsp;
3313         struct nfs_open_context *ctx;
3314         struct file_lock fl;
3315         unsigned long timestamp;
3316         int rpc_status;
3317         int cancelled;
3318 };
3319
3320 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3321                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3322 {
3323         struct nfs4_lockdata *p;
3324         struct inode *inode = lsp->ls_state->inode;
3325         struct nfs_server *server = NFS_SERVER(inode);
3326
3327         p = kzalloc(sizeof(*p), GFP_KERNEL);
3328         if (p == NULL)
3329                 return NULL;
3330
3331         p->arg.fh = NFS_FH(inode);
3332         p->arg.fl = &p->fl;
3333         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3334         if (p->arg.lock_seqid == NULL)
3335                 goto out_free;
3336         p->arg.lock_stateid = &lsp->ls_stateid;
3337         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3338         p->arg.lock_owner.id = lsp->ls_id.id;
3339         p->lsp = lsp;
3340         atomic_inc(&lsp->ls_count);
3341         p->ctx = get_nfs_open_context(ctx);
3342         memcpy(&p->fl, fl, sizeof(p->fl));
3343         return p;
3344 out_free:
3345         kfree(p);
3346         return NULL;
3347 }
3348
3349 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3350 {
3351         struct nfs4_lockdata *data = calldata;
3352         struct nfs4_state *state = data->lsp->ls_state;
3353         struct nfs4_state_owner *sp = state->owner;
3354         struct rpc_message msg = {
3355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3356                 .rpc_argp = &data->arg,
3357                 .rpc_resp = &data->res,
3358                 .rpc_cred = sp->so_cred,
3359         };
3360
3361         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3362                 return;
3363         dprintk("%s: begin!\n", __FUNCTION__);
3364         /* Do we need to do an open_to_lock_owner? */
3365         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3366                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3367                 if (data->arg.open_seqid == NULL) {
3368                         data->rpc_status = -ENOMEM;
3369                         task->tk_action = NULL;
3370                         goto out;
3371                 }
3372                 data->arg.open_stateid = &state->stateid;
3373                 data->arg.new_lock_owner = 1;
3374         }
3375         data->timestamp = jiffies;
3376         rpc_call_setup(task, &msg, 0);
3377 out:
3378         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3379 }
3380
3381 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3382 {
3383         struct nfs4_lockdata *data = calldata;
3384
3385         dprintk("%s: begin!\n", __FUNCTION__);
3386
3387         data->rpc_status = task->tk_status;
3388         if (RPC_ASSASSINATED(task))
3389                 goto out;
3390         if (data->arg.new_lock_owner != 0) {
3391                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3392                 if (data->rpc_status == 0)
3393                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3394                 else
3395                         goto out;
3396         }
3397         if (data->rpc_status == 0) {
3398                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3399                                         sizeof(data->lsp->ls_stateid.data));
3400                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3401                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3402         }
3403         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3404 out:
3405         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3406 }
3407
3408 static void nfs4_lock_release(void *calldata)
3409 {
3410         struct nfs4_lockdata *data = calldata;
3411
3412         dprintk("%s: begin!\n", __FUNCTION__);
3413         if (data->arg.open_seqid != NULL)
3414                 nfs_free_seqid(data->arg.open_seqid);
3415         if (data->cancelled != 0) {
3416                 struct rpc_task *task;
3417                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3418                                 data->arg.lock_seqid);
3419                 if (!IS_ERR(task))
3420                         rpc_put_task(task);
3421                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3422         } else
3423                 nfs_free_seqid(data->arg.lock_seqid);
3424         nfs4_put_lock_state(data->lsp);
3425         put_nfs_open_context(data->ctx);
3426         kfree(data);
3427         dprintk("%s: done!\n", __FUNCTION__);
3428 }
3429
3430 static const struct rpc_call_ops nfs4_lock_ops = {
3431         .rpc_call_prepare = nfs4_lock_prepare,
3432         .rpc_call_done = nfs4_lock_done,
3433         .rpc_release = nfs4_lock_release,
3434 };
3435
3436 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3437 {
3438         struct nfs4_lockdata *data;
3439         struct rpc_task *task;
3440         int ret;
3441
3442         dprintk("%s: begin!\n", __FUNCTION__);
3443         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3444                         fl->fl_u.nfs4_fl.owner);
3445         if (data == NULL)
3446                 return -ENOMEM;
3447         if (IS_SETLKW(cmd))
3448                 data->arg.block = 1;
3449         if (reclaim != 0)
3450                 data->arg.reclaim = 1;
3451         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3452                         &nfs4_lock_ops, data);
3453         if (IS_ERR(task))
3454                 return PTR_ERR(task);
3455         ret = nfs4_wait_for_completion_rpc_task(task);
3456         if (ret == 0) {
3457                 ret = data->rpc_status;
3458                 if (ret == -NFS4ERR_DENIED)
3459                         ret = -EAGAIN;
3460         } else
3461                 data->cancelled = 1;
3462         rpc_put_task(task);
3463         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3464         return ret;
3465 }
3466
3467 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3468 {
3469         struct nfs_server *server = NFS_SERVER(state->inode);
3470         struct nfs4_exception exception = { };
3471         int err;
3472
3473         do {
3474                 /* Cache the lock if possible... */
3475                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3476                         return 0;
3477                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3478                 if (err != -NFS4ERR_DELAY)
3479                         break;
3480                 nfs4_handle_exception(server, err, &exception);
3481         } while (exception.retry);
3482         return err;
3483 }
3484
3485 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3486 {
3487         struct nfs_server *server = NFS_SERVER(state->inode);
3488         struct nfs4_exception exception = { };
3489         int err;
3490
3491         err = nfs4_set_lock_state(state, request);
3492         if (err != 0)
3493                 return err;
3494         do {
3495                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3496                         return 0;
3497                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3498                 if (err != -NFS4ERR_DELAY)
3499                         break;
3500                 nfs4_handle_exception(server, err, &exception);
3501         } while (exception.retry);
3502         return err;
3503 }
3504
3505 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3506 {
3507         struct nfs_client *clp = state->owner->so_client;
3508         unsigned char fl_flags = request->fl_flags;
3509         int status;
3510
3511         /* Is this a delegated open? */
3512         status = nfs4_set_lock_state(state, request);
3513         if (status != 0)
3514                 goto out;
3515         request->fl_flags |= FL_ACCESS;
3516         status = do_vfs_lock(request->fl_file, request);
3517         if (status < 0)
3518                 goto out;
3519         down_read(&clp->cl_sem);
3520         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3521                 struct nfs_inode *nfsi = NFS_I(state->inode);
3522                 /* Yes: cache locks! */
3523                 down_read(&nfsi->rwsem);
3524                 /* ...but avoid races with delegation recall... */
3525                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3526                         request->fl_flags = fl_flags & ~FL_SLEEP;
3527                         status = do_vfs_lock(request->fl_file, request);
3528                         up_read(&nfsi->rwsem);
3529                         goto out_unlock;
3530                 }
3531                 up_read(&nfsi->rwsem);
3532         }
3533         status = _nfs4_do_setlk(state, cmd, request, 0);
3534         if (status != 0)
3535                 goto out_unlock;
3536         /* Note: we always want to sleep here! */
3537         request->fl_flags = fl_flags | FL_SLEEP;
3538         if (do_vfs_lock(request->fl_file, request) < 0)
3539                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3540 out_unlock:
3541         up_read(&clp->cl_sem);
3542 out:
3543         request->fl_flags = fl_flags;
3544         return status;
3545 }
3546
3547 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3548 {
3549         struct nfs4_exception exception = { };
3550         int err;
3551
3552         do {
3553                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3554                                 _nfs4_proc_setlk(state, cmd, request),
3555                                 &exception);
3556         } while (exception.retry);
3557         return err;
3558 }
3559
3560 static int
3561 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3562 {
3563         struct nfs_open_context *ctx;
3564         struct nfs4_state *state;
3565         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3566         int status;
3567
3568         /* verify open state */
3569         ctx = nfs_file_open_context(filp);
3570         state = ctx->state;
3571
3572         if (request->fl_start < 0 || request->fl_end < 0)
3573                 return -EINVAL;
3574
3575         if (IS_GETLK(cmd))
3576                 return nfs4_proc_getlk(state, F_GETLK, request);
3577
3578         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3579                 return -EINVAL;
3580
3581         if (request->fl_type == F_UNLCK)
3582                 return nfs4_proc_unlck(state, cmd, request);
3583
3584         do {
3585                 status = nfs4_proc_setlk(state, cmd, request);
3586                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3587                         break;
3588                 timeout = nfs4_set_lock_task_retry(timeout);
3589                 status = -ERESTARTSYS;
3590                 if (signalled())
3591                         break;
3592         } while(status < 0);
3593         return status;
3594 }
3595
3596 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3597 {
3598         struct nfs_server *server = NFS_SERVER(state->inode);
3599         struct nfs4_exception exception = { };
3600         int err;
3601
3602         err = nfs4_set_lock_state(state, fl);
3603         if (err != 0)
3604                 goto out;
3605         do {
3606                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3607                 if (err != -NFS4ERR_DELAY)
3608                         break;
3609                 err = nfs4_handle_exception(server, err, &exception);
3610         } while (exception.retry);
3611 out:
3612         return err;
3613 }
3614
3615 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3616
3617 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3618                 size_t buflen, int flags)
3619 {
3620         struct inode *inode = dentry->d_inode;
3621
3622         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3623                 return -EOPNOTSUPP;
3624
3625         if (!S_ISREG(inode->i_mode) &&
3626             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3627                 return -EPERM;
3628
3629         return nfs4_proc_set_acl(inode, buf, buflen);
3630 }
3631
3632 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3633  * and that's what we'll do for e.g. user attributes that haven't been set.
3634  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3635  * attributes in kernel-managed attribute namespaces. */
3636 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3637                 size_t buflen)
3638 {
3639         struct inode *inode = dentry->d_inode;
3640
3641         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3642                 return -EOPNOTSUPP;
3643
3644         return nfs4_proc_get_acl(inode, buf, buflen);
3645 }
3646
3647 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3648 {
3649         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3650
3651         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3652                 return 0;
3653         if (buf && buflen < len)
3654                 return -ERANGE;
3655         if (buf)
3656                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3657         return len;
3658 }
3659
3660 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3661                 struct nfs4_fs_locations *fs_locations, struct page *page)
3662 {
3663         struct nfs_server *server = NFS_SERVER(dir);
3664         u32 bitmask[2] = {
3665                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3666                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3667         };
3668         struct nfs4_fs_locations_arg args = {
3669                 .dir_fh = NFS_FH(dir),
3670                 .name = name,
3671                 .page = page,
3672                 .bitmask = bitmask,
3673         };
3674         struct rpc_message msg = {
3675                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3676                 .rpc_argp = &args,
3677                 .rpc_resp = fs_locations,
3678         };
3679         int status;
3680
3681         dprintk("%s: start\n", __FUNCTION__);
3682         nfs_fattr_init(&fs_locations->fattr);
3683         fs_locations->server = server;
3684         fs_locations->nlocations = 0;
3685         status = rpc_call_sync(server->client, &msg, 0);
3686         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3687         return status;
3688 }
3689
3690 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3691         .recover_open   = nfs4_open_reclaim,
3692         .recover_lock   = nfs4_lock_reclaim,
3693 };
3694
3695 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3696         .recover_open   = nfs4_open_expired,
3697         .recover_lock   = nfs4_lock_expired,
3698 };
3699
3700 static const struct inode_operations nfs4_file_inode_operations = {
3701         .permission     = nfs_permission,
3702         .getattr        = nfs_getattr,
3703         .setattr        = nfs_setattr,
3704         .getxattr       = nfs4_getxattr,
3705         .setxattr       = nfs4_setxattr,
3706         .listxattr      = nfs4_listxattr,
3707 };
3708
3709 const struct nfs_rpc_ops nfs_v4_clientops = {
3710         .version        = 4,                    /* protocol version */
3711         .dentry_ops     = &nfs4_dentry_operations,
3712         .dir_inode_ops  = &nfs4_dir_inode_operations,
3713         .file_inode_ops = &nfs4_file_inode_operations,
3714         .getroot        = nfs4_proc_get_root,
3715         .getattr        = nfs4_proc_getattr,
3716         .setattr        = nfs4_proc_setattr,
3717         .lookupfh       = nfs4_proc_lookupfh,
3718         .lookup         = nfs4_proc_lookup,
3719         .access         = nfs4_proc_access,
3720         .readlink       = nfs4_proc_readlink,
3721         .create         = nfs4_proc_create,
3722         .remove         = nfs4_proc_remove,
3723         .unlink_setup   = nfs4_proc_unlink_setup,
3724         .unlink_done    = nfs4_proc_unlink_done,
3725         .rename         = nfs4_proc_rename,
3726         .link           = nfs4_proc_link,
3727         .symlink        = nfs4_proc_symlink,
3728         .mkdir          = nfs4_proc_mkdir,
3729         .rmdir          = nfs4_proc_remove,
3730         .readdir        = nfs4_proc_readdir,
3731         .mknod          = nfs4_proc_mknod,
3732         .statfs         = nfs4_proc_statfs,
3733         .fsinfo         = nfs4_proc_fsinfo,
3734         .pathconf       = nfs4_proc_pathconf,
3735         .set_capabilities = nfs4_server_capabilities,
3736         .decode_dirent  = nfs4_decode_dirent,
3737         .read_setup     = nfs4_proc_read_setup,
3738         .read_done      = nfs4_read_done,
3739         .write_setup    = nfs4_proc_write_setup,
3740         .write_done     = nfs4_write_done,
3741         .commit_setup   = nfs4_proc_commit_setup,
3742         .commit_done    = nfs4_commit_done,
3743         .file_open      = nfs_open,
3744         .file_release   = nfs_release,
3745         .lock           = nfs4_proc_lock,
3746         .clear_acl_cache = nfs4_zap_acl_attr,
3747 };
3748
3749 /*
3750  * Local variables:
3751  *  c-basic-offset: 8
3752  * End:
3753  */