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 "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70
  71 /* Prevent leaks of NFSv4 errors into userland */
  72 int nfs4_map_errors(int err)
  73 {
  74         if (err < -1000) {
  75                 dprintk("%s could not handle NFSv4 error %d\n",
  76                                 __func__, -err);
  77                 return -EIO;
  78         }
  79         return err;
  80 }
  81
  82 /*
  83  * This is our standard bitmap for GETATTR requests.
  84  */
  85 const u32 nfs4_fattr_bitmap[2] = {
  86         FATTR4_WORD0_TYPE
  87         | FATTR4_WORD0_CHANGE
  88         | FATTR4_WORD0_SIZE
  89         | FATTR4_WORD0_FSID
  90         | FATTR4_WORD0_FILEID,
  91         FATTR4_WORD1_MODE
  92         | FATTR4_WORD1_NUMLINKS
  93         | FATTR4_WORD1_OWNER
  94         | FATTR4_WORD1_OWNER_GROUP
  95         | FATTR4_WORD1_RAWDEV
  96         | FATTR4_WORD1_SPACE_USED
  97         | FATTR4_WORD1_TIME_ACCESS
  98         | FATTR4_WORD1_TIME_METADATA
  99         | FATTR4_WORD1_TIME_MODIFY
 100 };
 101
 102 const u32 nfs4_statfs_bitmap[2] = {
 103         FATTR4_WORD0_FILES_AVAIL
 104         | FATTR4_WORD0_FILES_FREE
 105         | FATTR4_WORD0_FILES_TOTAL,
 106         FATTR4_WORD1_SPACE_AVAIL
 107         | FATTR4_WORD1_SPACE_FREE
 108         | FATTR4_WORD1_SPACE_TOTAL
 109 };
 110
 111 const u32 nfs4_pathconf_bitmap[2] = {
 112         FATTR4_WORD0_MAXLINK
 113         | FATTR4_WORD0_MAXNAME,
 114         0
 115 };
 116
 117 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 118                         | FATTR4_WORD0_MAXREAD
 119                         | FATTR4_WORD0_MAXWRITE
 120                         | FATTR4_WORD0_LEASE_TIME,
 121                         0
 122 };
 123
 124 const u32 nfs4_fs_locations_bitmap[2] = {
 125         FATTR4_WORD0_TYPE
 126         | FATTR4_WORD0_CHANGE
 127         | FATTR4_WORD0_SIZE
 128         | FATTR4_WORD0_FSID
 129         | FATTR4_WORD0_FILEID
 130         | FATTR4_WORD0_FS_LOCATIONS,
 131         FATTR4_WORD1_MODE
 132         | FATTR4_WORD1_NUMLINKS
 133         | FATTR4_WORD1_OWNER
 134         | FATTR4_WORD1_OWNER_GROUP
 135         | FATTR4_WORD1_RAWDEV
 136         | FATTR4_WORD1_SPACE_USED
 137         | FATTR4_WORD1_TIME_ACCESS
 138         | FATTR4_WORD1_TIME_METADATA
 139         | FATTR4_WORD1_TIME_MODIFY
 140         | FATTR4_WORD1_MOUNTED_ON_FILEID
 141 };
 142
 143 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 144                 struct nfs4_readdir_arg *readdir)
 145 {
 146         __be32 *start, *p;
 147
 148         BUG_ON(readdir->count < 80);
 149         if (cookie > 2) {
 150                 readdir->cookie = cookie;
 151                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 152                 return;
 153         }
 154
 155         readdir->cookie = 0;
 156         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 157         if (cookie == 2)
 158                 return;
 159
 160         /*
 161          * NFSv4 servers do not return entries for '.' and '..'
 162          * Therefore, we fake these entries here.  We let '.'
 163          * have cookie 0 and '..' have cookie 1.  Note that
 164          * when talking to the server, we always send cookie 0
 165          * instead of 1 or 2.
 166          */
 167         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 168
 169         if (cookie == 0) {
 170                 *p++ = xdr_one;                                  /* next */
 171                 *p++ = xdr_zero;                   /* cookie, first word */
 172                 *p++ = xdr_one;                   /* cookie, second word */
 173                 *p++ = xdr_one;                             /* entry len */
 174                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 175                 p++;
 176                 *p++ = xdr_one;                         /* bitmap length */
 177                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 178                 *p++ = htonl(8);              /* attribute buffer length */
 179                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 180         }
 181
 182         *p++ = xdr_one;                                  /* next */
 183         *p++ = xdr_zero;                   /* cookie, first word */
 184         *p++ = xdr_two;                   /* cookie, second word */
 185         *p++ = xdr_two;                             /* entry len */
 186         memcpy(p, "..\0\0", 4);                         /* entry */
 187         p++;
 188         *p++ = xdr_one;                         /* bitmap length */
 189         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 190         *p++ = htonl(8);              /* attribute buffer length */
 191         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 192
 193         readdir->pgbase = (char *)p - (char *)start;
 194         readdir->count -= readdir->pgbase;
 195         kunmap_atomic(start, KM_USER0);
 196 }
 197
 198 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 199 {
 200         struct nfs_client *clp = server->nfs_client;
 201         spin_lock(&clp->cl_lock);
 202         if (time_before(clp->cl_last_renewal,timestamp))
 203                 clp->cl_last_renewal = timestamp;
 204         spin_unlock(&clp->cl_lock);
 205 }
 206
 207 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 208 {
 209         struct nfs_inode *nfsi = NFS_I(dir);
 210
 211         spin_lock(&dir->i_lock);
 212         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 213         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 214                 nfs_force_lookup_revalidate(dir);
 215         nfsi->change_attr = cinfo->after;
 216         spin_unlock(&dir->i_lock);
 217 }
 218
 219 struct nfs4_opendata {
 220         struct kref kref;
 221         struct nfs_openargs o_arg;
 222         struct nfs_openres o_res;
 223         struct nfs_open_confirmargs c_arg;
 224         struct nfs_open_confirmres c_res;
 225         struct nfs_fattr f_attr;
 226         struct nfs_fattr dir_attr;
 227         struct path path;
 228         struct dentry *dir;
 229         struct nfs4_state_owner *owner;
 230         struct nfs4_state *state;
 231         struct iattr attrs;
 232         unsigned long timestamp;
 233         unsigned int rpc_done : 1;
 234         int rpc_status;
 235         int cancelled;
 236 };
 237
 238
 239 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 240 {
 241         p->o_res.f_attr = &p->f_attr;
 242         p->o_res.dir_attr = &p->dir_attr;
 243         p->o_res.seqid = p->o_arg.seqid;
 244         p->c_res.seqid = p->c_arg.seqid;
 245         p->o_res.server = p->o_arg.server;
 246         nfs_fattr_init(&p->f_attr);
 247         nfs_fattr_init(&p->dir_attr);
 248 }
 249
 250 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 251                 struct nfs4_state_owner *sp, int flags,
 252                 const struct iattr *attrs)
 253 {
 254         struct dentry *parent = dget_parent(path->dentry);
 255         struct inode *dir = parent->d_inode;
 256         struct nfs_server *server = NFS_SERVER(dir);
 257         struct nfs4_opendata *p;
 258
 259         p = kzalloc(sizeof(*p), GFP_KERNEL);
 260         if (p == NULL)
 261                 goto err;
 262         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 263         if (p->o_arg.seqid == NULL)
 264                 goto err_free;
 265         p->path.mnt = mntget(path->mnt);
 266         p->path.dentry = dget(path->dentry);
 267         p->dir = parent;
 268         p->owner = sp;
 269         atomic_inc(&sp->so_count);
 270         p->o_arg.fh = NFS_FH(dir);
 271         p->o_arg.open_flags = flags,
 272         p->o_arg.clientid = server->nfs_client->cl_clientid;
 273         p->o_arg.id = sp->so_owner_id.id;
 274         p->o_arg.name = &p->path.dentry->d_name;
 275         p->o_arg.server = server;
 276         p->o_arg.bitmask = server->attr_bitmask;
 277         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 278         if (flags & O_EXCL) {
 279                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 280                 s[0] = jiffies;
 281                 s[1] = current->pid;
 282         } else if (flags & O_CREAT) {
 283                 p->o_arg.u.attrs = &p->attrs;
 284                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 285         }
 286         p->c_arg.fh = &p->o_res.fh;
 287         p->c_arg.stateid = &p->o_res.stateid;
 288         p->c_arg.seqid = p->o_arg.seqid;
 289         nfs4_init_opendata_res(p);
 290         kref_init(&p->kref);
 291         return p;
 292 err_free:
 293         kfree(p);
 294 err:
 295         dput(parent);
 296         return NULL;
 297 }
 298
 299 static void nfs4_opendata_free(struct kref *kref)
 300 {
 301         struct nfs4_opendata *p = container_of(kref,
 302                         struct nfs4_opendata, kref);
 303
 304         nfs_free_seqid(p->o_arg.seqid);
 305         if (p->state != NULL)
 306                 nfs4_put_open_state(p->state);
 307         nfs4_put_state_owner(p->owner);
 308         dput(p->dir);
 309         path_put(&p->path);
 310         kfree(p);
 311 }
 312
 313 static void nfs4_opendata_put(struct nfs4_opendata *p)
 314 {
 315         if (p != NULL)
 316                 kref_put(&p->kref, nfs4_opendata_free);
 317 }
 318
 319 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 320 {
 321         int ret;
 322
 323         ret = rpc_wait_for_completion_task(task);
 324         return ret;
 325 }
 326
 327 static int can_open_cached(struct nfs4_state *state, int mode)
 328 {
 329         int ret = 0;
 330         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 331                 case FMODE_READ:
 332                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 333                         break;
 334                 case FMODE_WRITE:
 335                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 336                         break;
 337                 case FMODE_READ|FMODE_WRITE:
 338                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 339         }
 340         return ret;
 341 }
 342
 343 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 344 {
 345         if ((delegation->type & open_flags) != open_flags)
 346                 return 0;
 347         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 348                 return 0;
 349         return 1;
 350 }
 351
 352 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 353 {
 354         switch (open_flags) {
 355                 case FMODE_WRITE:
 356                         state->n_wronly++;
 357                         break;
 358                 case FMODE_READ:
 359                         state->n_rdonly++;
 360                         break;
 361                 case FMODE_READ|FMODE_WRITE:
 362                         state->n_rdwr++;
 363         }
 364         nfs4_state_set_mode_locked(state, state->state | open_flags);
 365 }
 366
 367 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 368 {
 369         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 370                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 371         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 372         switch (open_flags) {
 373                 case FMODE_READ:
 374                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 375                         break;
 376                 case FMODE_WRITE:
 377                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 378                         break;
 379                 case FMODE_READ|FMODE_WRITE:
 380                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 381         }
 382 }
 383
 384 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 385 {
 386         write_seqlock(&state->seqlock);
 387         nfs_set_open_stateid_locked(state, stateid, open_flags);
 388         write_sequnlock(&state->seqlock);
 389 }
 390
 391 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 392 {
 393         open_flags &= (FMODE_READ|FMODE_WRITE);
 394         /*
 395          * Protect the call to nfs4_state_set_mode_locked and
 396          * serialise the stateid update
 397          */
 398         write_seqlock(&state->seqlock);
 399         if (deleg_stateid != NULL) {
 400                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 401                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 402         }
 403         if (open_stateid != NULL)
 404                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 405         write_sequnlock(&state->seqlock);
 406         spin_lock(&state->owner->so_lock);
 407         update_open_stateflags(state, open_flags);
 408         spin_unlock(&state->owner->so_lock);
 409 }
 410
 411 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 412 {
 413         struct nfs_delegation *delegation;
 414
 415         rcu_read_lock();
 416         delegation = rcu_dereference(NFS_I(inode)->delegation);
 417         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 418                 rcu_read_unlock();
 419                 return;
 420         }
 421         rcu_read_unlock();
 422         nfs_inode_return_delegation(inode);
 423 }
 424
 425 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 426 {
 427         struct nfs4_state *state = opendata->state;
 428         struct nfs_inode *nfsi = NFS_I(state->inode);
 429         struct nfs_delegation *delegation;
 430         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 431         nfs4_stateid stateid;
 432         int ret = -EAGAIN;
 433
 434         rcu_read_lock();
 435         delegation = rcu_dereference(nfsi->delegation);
 436         for (;;) {
 437                 if (can_open_cached(state, open_mode)) {
 438                         spin_lock(&state->owner->so_lock);
 439                         if (can_open_cached(state, open_mode)) {
 440                                 update_open_stateflags(state, open_mode);
 441                                 spin_unlock(&state->owner->so_lock);
 442                                 rcu_read_unlock();
 443                                 goto out_return_state;
 444                         }
 445                         spin_unlock(&state->owner->so_lock);
 446                 }
 447                 if (delegation == NULL)
 448                         break;
 449                 if (!can_open_delegated(delegation, open_mode))
 450                         break;
 451                 /* Save the delegation */
 452                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 453                 rcu_read_unlock();
 454                 lock_kernel();
 455                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 456                 unlock_kernel();
 457                 if (ret != 0)
 458                         goto out;
 459                 ret = -EAGAIN;
 460                 rcu_read_lock();
 461                 delegation = rcu_dereference(nfsi->delegation);
 462                 /* If no delegation, try a cached open */
 463                 if (delegation == NULL)
 464                         continue;
 465                 /* Is the delegation still valid? */
 466                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 467                         continue;
 468                 rcu_read_unlock();
 469                 update_open_stateid(state, NULL, &stateid, open_mode);
 470                 goto out_return_state;
 471         }
 472         rcu_read_unlock();
 473 out:
 474         return ERR_PTR(ret);
 475 out_return_state:
 476         atomic_inc(&state->count);
 477         return state;
 478 }
 479
 480 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 481 {
 482         struct inode *inode;
 483         struct nfs4_state *state = NULL;
 484         struct nfs_delegation *delegation;
 485         nfs4_stateid *deleg_stateid = NULL;
 486         int ret;
 487
 488         if (!data->rpc_done) {
 489                 state = nfs4_try_open_cached(data);
 490                 goto out;
 491         }
 492
 493         ret = -EAGAIN;
 494         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 495                 goto err;
 496         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 497         ret = PTR_ERR(inode);
 498         if (IS_ERR(inode))
 499                 goto err;
 500         ret = -ENOMEM;
 501         state = nfs4_get_open_state(inode, data->owner);
 502         if (state == NULL)
 503                 goto err_put_inode;
 504         if (data->o_res.delegation_type != 0) {
 505                 int delegation_flags = 0;
 506
 507                 rcu_read_lock();
 508                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 509                 if (delegation)
 510                         delegation_flags = delegation->flags;
 511                 rcu_read_unlock();
 512                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 513                         nfs_inode_set_delegation(state->inode,
 514                                         data->owner->so_cred,
 515                                         &data->o_res);
 516                 else
 517                         nfs_inode_reclaim_delegation(state->inode,
 518                                         data->owner->so_cred,
 519                                         &data->o_res);
 520         }
 521         rcu_read_lock();
 522         delegation = rcu_dereference(NFS_I(inode)->delegation);
 523         if (delegation != NULL)
 524                 deleg_stateid = &delegation->stateid;
 525         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 526         rcu_read_unlock();
 527         iput(inode);
 528 out:
 529         return state;
 530 err_put_inode:
 531         iput(inode);
 532 err:
 533         return ERR_PTR(ret);
 534 }
 535
 536 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 537 {
 538         struct nfs_inode *nfsi = NFS_I(state->inode);
 539         struct nfs_open_context *ctx;
 540
 541         spin_lock(&state->inode->i_lock);
 542         list_for_each_entry(ctx, &nfsi->open_files, list) {
 543                 if (ctx->state != state)
 544                         continue;
 545                 get_nfs_open_context(ctx);
 546                 spin_unlock(&state->inode->i_lock);
 547                 return ctx;
 548         }
 549         spin_unlock(&state->inode->i_lock);
 550         return ERR_PTR(-ENOENT);
 551 }
 552
 553 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 554 {
 555         struct nfs4_opendata *opendata;
 556
 557         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 558         if (opendata == NULL)
 559                 return ERR_PTR(-ENOMEM);
 560         opendata->state = state;
 561         atomic_inc(&state->count);
 562         return opendata;
 563 }
 564
 565 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 566 {
 567         struct nfs4_state *newstate;
 568         int ret;
 569
 570         opendata->o_arg.open_flags = openflags;
 571         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 572         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 573         nfs4_init_opendata_res(opendata);
 574         ret = _nfs4_proc_open(opendata);
 575         if (ret != 0)
 576                 return ret;
 577         newstate = nfs4_opendata_to_nfs4_state(opendata);
 578         if (IS_ERR(newstate))
 579                 return PTR_ERR(newstate);
 580         nfs4_close_state(&opendata->path, newstate, openflags);
 581         *res = newstate;
 582         return 0;
 583 }
 584
 585 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 586 {
 587         struct nfs4_state *newstate;
 588         int ret;
 589
 590         /* memory barrier prior to reading state->n_* */
 591         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 592         smp_rmb();
 593         if (state->n_rdwr != 0) {
 594                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 595                 if (ret != 0)
 596                         return ret;
 597                 if (newstate != state)
 598                         return -ESTALE;
 599         }
 600         if (state->n_wronly != 0) {
 601                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 602                 if (ret != 0)
 603                         return ret;
 604                 if (newstate != state)
 605                         return -ESTALE;
 606         }
 607         if (state->n_rdonly != 0) {
 608                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 609                 if (ret != 0)
 610                         return ret;
 611                 if (newstate != state)
 612                         return -ESTALE;
 613         }
 614         /*
 615          * We may have performed cached opens for all three recoveries.
 616          * Check if we need to update the current stateid.
 617          */
 618         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 619             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 620                 write_seqlock(&state->seqlock);
 621                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 622                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 623                 write_sequnlock(&state->seqlock);
 624         }
 625         return 0;
 626 }
 627
 628 /*
 629  * OPEN_RECLAIM:
 630  *      reclaim state on the server after a reboot.
 631  */
 632 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 633 {
 634         struct nfs_delegation *delegation;
 635         struct nfs4_opendata *opendata;
 636         int delegation_type = 0;
 637         int status;
 638
 639         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 640         if (IS_ERR(opendata))
 641                 return PTR_ERR(opendata);
 642         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 643         opendata->o_arg.fh = NFS_FH(state->inode);
 644         rcu_read_lock();
 645         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 646         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 647                 delegation_type = delegation->type;
 648         rcu_read_unlock();
 649         opendata->o_arg.u.delegation_type = delegation_type;
 650         status = nfs4_open_recover(opendata, state);
 651         nfs4_opendata_put(opendata);
 652         return status;
 653 }
 654
 655 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 656 {
 657         struct nfs_server *server = NFS_SERVER(state->inode);
 658         struct nfs4_exception exception = { };
 659         int err;
 660         do {
 661                 err = _nfs4_do_open_reclaim(ctx, state);
 662                 if (err != -NFS4ERR_DELAY)
 663                         break;
 664                 nfs4_handle_exception(server, err, &exception);
 665         } while (exception.retry);
 666         return err;
 667 }
 668
 669 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 670 {
 671         struct nfs_open_context *ctx;
 672         int ret;
 673
 674         ctx = nfs4_state_find_open_context(state);
 675         if (IS_ERR(ctx))
 676                 return PTR_ERR(ctx);
 677         ret = nfs4_do_open_reclaim(ctx, state);
 678         put_nfs_open_context(ctx);
 679         return ret;
 680 }
 681
 682 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 683 {
 684         struct nfs4_opendata *opendata;
 685         int ret;
 686
 687         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 688         if (IS_ERR(opendata))
 689                 return PTR_ERR(opendata);
 690         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 691         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 692                         sizeof(opendata->o_arg.u.delegation.data));
 693         ret = nfs4_open_recover(opendata, state);
 694         nfs4_opendata_put(opendata);
 695         return ret;
 696 }
 697
 698 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 699 {
 700         struct nfs4_exception exception = { };
 701         struct nfs_server *server = NFS_SERVER(state->inode);
 702         int err;
 703         do {
 704                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 705                 switch (err) {
 706                         case 0:
 707                                 return err;
 708                         case -NFS4ERR_STALE_CLIENTID:
 709                         case -NFS4ERR_STALE_STATEID:
 710                         case -NFS4ERR_EXPIRED:
 711                                 /* Don't recall a delegation if it was lost */
 712                                 nfs4_schedule_state_recovery(server->nfs_client);
 713                                 return err;
 714                 }
 715                 err = nfs4_handle_exception(server, err, &exception);
 716         } while (exception.retry);
 717         return err;
 718 }
 719
 720 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 721 {
 722         struct nfs4_opendata *data = calldata;
 723
 724         data->rpc_status = task->tk_status;
 725         if (RPC_ASSASSINATED(task))
 726                 return;
 727         if (data->rpc_status == 0) {
 728                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 729                                 sizeof(data->o_res.stateid.data));
 730                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 731                 renew_lease(data->o_res.server, data->timestamp);
 732                 data->rpc_done = 1;
 733         }
 734 }
 735
 736 static void nfs4_open_confirm_release(void *calldata)
 737 {
 738         struct nfs4_opendata *data = calldata;
 739         struct nfs4_state *state = NULL;
 740
 741         /* If this request hasn't been cancelled, do nothing */
 742         if (data->cancelled == 0)
 743                 goto out_free;
 744         /* In case of error, no cleanup! */
 745         if (!data->rpc_done)
 746                 goto out_free;
 747         state = nfs4_opendata_to_nfs4_state(data);
 748         if (!IS_ERR(state))
 749                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 750 out_free:
 751         nfs4_opendata_put(data);
 752 }
 753
 754 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 755         .rpc_call_done = nfs4_open_confirm_done,
 756         .rpc_release = nfs4_open_confirm_release,
 757 };
 758
 759 /*
 760  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 761  */
 762 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 763 {
 764         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 765         struct rpc_task *task;
 766         struct  rpc_message msg = {
 767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 768                 .rpc_argp = &data->c_arg,
 769                 .rpc_resp = &data->c_res,
 770                 .rpc_cred = data->owner->so_cred,
 771         };
 772         struct rpc_task_setup task_setup_data = {
 773                 .rpc_client = server->client,
 774                 .rpc_message = &msg,
 775                 .callback_ops = &nfs4_open_confirm_ops,
 776                 .callback_data = data,
 777                 .workqueue = nfsiod_workqueue,
 778                 .flags = RPC_TASK_ASYNC,
 779         };
 780         int status;
 781
 782         kref_get(&data->kref);
 783         data->rpc_done = 0;
 784         data->rpc_status = 0;
 785         data->timestamp = jiffies;
 786         task = rpc_run_task(&task_setup_data);
 787         if (IS_ERR(task))
 788                 return PTR_ERR(task);
 789         status = nfs4_wait_for_completion_rpc_task(task);
 790         if (status != 0) {
 791                 data->cancelled = 1;
 792                 smp_wmb();
 793         } else
 794                 status = data->rpc_status;
 795         rpc_put_task(task);
 796         return status;
 797 }
 798
 799 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_opendata *data = calldata;
 802         struct nfs4_state_owner *sp = data->owner;
 803
 804         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 805                 return;
 806         /*
 807          * Check if we still need to send an OPEN call, or if we can use
 808          * a delegation instead.
 809          */
 810         if (data->state != NULL) {
 811                 struct nfs_delegation *delegation;
 812
 813                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 814                         goto out_no_action;
 815                 rcu_read_lock();
 816                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 817                 if (delegation != NULL &&
 818                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 819                         rcu_read_unlock();
 820                         goto out_no_action;
 821                 }
 822                 rcu_read_unlock();
 823         }
 824         /* Update sequence id. */
 825         data->o_arg.id = sp->so_owner_id.id;
 826         data->o_arg.clientid = sp->so_client->cl_clientid;
 827         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 828                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 829                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 830         }
 831         data->timestamp = jiffies;
 832         rpc_call_start(task);
 833         return;
 834 out_no_action:
 835         task->tk_action = NULL;
 836
 837 }
 838
 839 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 840 {
 841         struct nfs4_opendata *data = calldata;
 842
 843         data->rpc_status = task->tk_status;
 844         if (RPC_ASSASSINATED(task))
 845                 return;
 846         if (task->tk_status == 0) {
 847                 switch (data->o_res.f_attr->mode & S_IFMT) {
 848                         case S_IFREG:
 849                                 break;
 850                         case S_IFLNK:
 851                                 data->rpc_status = -ELOOP;
 852                                 break;
 853                         case S_IFDIR:
 854                                 data->rpc_status = -EISDIR;
 855                                 break;
 856                         default:
 857                                 data->rpc_status = -ENOTDIR;
 858                 }
 859                 renew_lease(data->o_res.server, data->timestamp);
 860                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 861                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 862         }
 863         data->rpc_done = 1;
 864 }
 865
 866 static void nfs4_open_release(void *calldata)
 867 {
 868         struct nfs4_opendata *data = calldata;
 869         struct nfs4_state *state = NULL;
 870
 871         /* If this request hasn't been cancelled, do nothing */
 872         if (data->cancelled == 0)
 873                 goto out_free;
 874         /* In case of error, no cleanup! */
 875         if (data->rpc_status != 0 || !data->rpc_done)
 876                 goto out_free;
 877         /* In case we need an open_confirm, no cleanup! */
 878         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 879                 goto out_free;
 880         state = nfs4_opendata_to_nfs4_state(data);
 881         if (!IS_ERR(state))
 882                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 883 out_free:
 884         nfs4_opendata_put(data);
 885 }
 886
 887 static const struct rpc_call_ops nfs4_open_ops = {
 888         .rpc_call_prepare = nfs4_open_prepare,
 889         .rpc_call_done = nfs4_open_done,
 890         .rpc_release = nfs4_open_release,
 891 };
 892
 893 /*
 894  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 895  */
 896 static int _nfs4_proc_open(struct nfs4_opendata *data)
 897 {
 898         struct inode *dir = data->dir->d_inode;
 899         struct nfs_server *server = NFS_SERVER(dir);
 900         struct nfs_openargs *o_arg = &data->o_arg;
 901         struct nfs_openres *o_res = &data->o_res;
 902         struct rpc_task *task;
 903         struct rpc_message msg = {
 904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 905                 .rpc_argp = o_arg,
 906                 .rpc_resp = o_res,
 907                 .rpc_cred = data->owner->so_cred,
 908         };
 909         struct rpc_task_setup task_setup_data = {
 910                 .rpc_client = server->client,
 911                 .rpc_message = &msg,
 912                 .callback_ops = &nfs4_open_ops,
 913                 .callback_data = data,
 914                 .workqueue = nfsiod_workqueue,
 915                 .flags = RPC_TASK_ASYNC,
 916         };
 917         int status;
 918
 919         kref_get(&data->kref);
 920         data->rpc_done = 0;
 921         data->rpc_status = 0;
 922         data->cancelled = 0;
 923         task = rpc_run_task(&task_setup_data);
 924         if (IS_ERR(task))
 925                 return PTR_ERR(task);
 926         status = nfs4_wait_for_completion_rpc_task(task);
 927         if (status != 0) {
 928                 data->cancelled = 1;
 929                 smp_wmb();
 930         } else
 931                 status = data->rpc_status;
 932         rpc_put_task(task);
 933         if (status != 0 || !data->rpc_done)
 934                 return status;
 935
 936         if (o_res->fh.size == 0)
 937                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 938
 939         if (o_arg->open_flags & O_CREAT) {
 940                 update_changeattr(dir, &o_res->cinfo);
 941                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 942         } else
 943                 nfs_refresh_inode(dir, o_res->dir_attr);
 944         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 945                 status = _nfs4_proc_open_confirm(data);
 946                 if (status != 0)
 947                         return status;
 948         }
 949         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 950                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 951         return 0;
 952 }
 953
 954 static int nfs4_recover_expired_lease(struct nfs_server *server)
 955 {
 956         struct nfs_client *clp = server->nfs_client;
 957         int ret;
 958
 959         for (;;) {
 960                 ret = nfs4_wait_clnt_recover(server->client, clp);
 961                 if (ret != 0)
 962                         return ret;
 963                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 964                         break;
 965                 nfs4_schedule_state_recovery(clp);
 966         }
 967         return 0;
 968 }
 969
 970 /*
 971  * OPEN_EXPIRED:
 972  *      reclaim state on the server after a network partition.
 973  *      Assumes caller holds the appropriate lock
 974  */
 975 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 976 {
 977         struct nfs4_opendata *opendata;
 978         int ret;
 979
 980         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 981         if (IS_ERR(opendata))
 982                 return PTR_ERR(opendata);
 983         ret = nfs4_open_recover(opendata, state);
 984         if (ret == -ESTALE)
 985                 d_drop(ctx->path.dentry);
 986         nfs4_opendata_put(opendata);
 987         return ret;
 988 }
 989
 990 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 991 {
 992         struct nfs_server *server = NFS_SERVER(state->inode);
 993         struct nfs4_exception exception = { };
 994         int err;
 995
 996         do {
 997                 err = _nfs4_open_expired(ctx, state);
 998                 if (err == -NFS4ERR_DELAY)
 999                         nfs4_handle_exception(server, err, &exception);
1000         } while (exception.retry);
1001         return err;
1002 }
1003
1004 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1005 {
1006         struct nfs_open_context *ctx;
1007         int ret;
1008
1009         ctx = nfs4_state_find_open_context(state);
1010         if (IS_ERR(ctx))
1011                 return PTR_ERR(ctx);
1012         ret = nfs4_do_open_expired(ctx, state);
1013         put_nfs_open_context(ctx);
1014         return ret;
1015 }
1016
1017 /*
1018  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1019  * fields corresponding to attributes that were used to store the verifier.
1020  * Make sure we clobber those fields in the later setattr call
1021  */
1022 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1023 {
1024         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1025             !(sattr->ia_valid & ATTR_ATIME_SET))
1026                 sattr->ia_valid |= ATTR_ATIME;
1027
1028         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1029             !(sattr->ia_valid & ATTR_MTIME_SET))
1030                 sattr->ia_valid |= ATTR_MTIME;
1031 }
1032
1033 /*
1034  * Returns a referenced nfs4_state
1035  */
1036 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1037 {
1038         struct nfs4_state_owner  *sp;
1039         struct nfs4_state     *state = NULL;
1040         struct nfs_server       *server = NFS_SERVER(dir);
1041         struct nfs_client *clp = server->nfs_client;
1042         struct nfs4_opendata *opendata;
1043         int status;
1044
1045         /* Protect against reboot recovery conflicts */
1046         status = -ENOMEM;
1047         if (!(sp = nfs4_get_state_owner(server, cred))) {
1048                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1049                 goto out_err;
1050         }
1051         status = nfs4_recover_expired_lease(server);
1052         if (status != 0)
1053                 goto err_put_state_owner;
1054         if (path->dentry->d_inode != NULL)
1055                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1056         down_read(&clp->cl_sem);
1057         status = -ENOMEM;
1058         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1059         if (opendata == NULL)
1060                 goto err_release_rwsem;
1061
1062         if (path->dentry->d_inode != NULL)
1063                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1064
1065         status = _nfs4_proc_open(opendata);
1066         if (status != 0)
1067                 goto err_opendata_put;
1068
1069         if (opendata->o_arg.open_flags & O_EXCL)
1070                 nfs4_exclusive_attrset(opendata, sattr);
1071
1072         state = nfs4_opendata_to_nfs4_state(opendata);
1073         status = PTR_ERR(state);
1074         if (IS_ERR(state))
1075                 goto err_opendata_put;
1076         nfs4_opendata_put(opendata);
1077         nfs4_put_state_owner(sp);
1078         up_read(&clp->cl_sem);
1079         *res = state;
1080         return 0;
1081 err_opendata_put:
1082         nfs4_opendata_put(opendata);
1083 err_release_rwsem:
1084         up_read(&clp->cl_sem);
1085 err_put_state_owner:
1086         nfs4_put_state_owner(sp);
1087 out_err:
1088         *res = NULL;
1089         return status;
1090 }
1091
1092
1093 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1094 {
1095         struct nfs4_exception exception = { };
1096         struct nfs4_state *res;
1097         int status;
1098
1099         do {
1100                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1101                 if (status == 0)
1102                         break;
1103                 /* NOTE: BAD_SEQID means the server and client disagree about the
1104                  * book-keeping w.r.t. state-changing operations
1105                  * (OPEN/CLOSE/LOCK/LOCKU...)
1106                  * It is actually a sign of a bug on the client or on the server.
1107                  *
1108                  * If we receive a BAD_SEQID error in the particular case of
1109                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1110                  * have unhashed the old state_owner for us, and that we can
1111                  * therefore safely retry using a new one. We should still warn
1112                  * the user though...
1113                  */
1114                 if (status == -NFS4ERR_BAD_SEQID) {
1115                         printk(KERN_WARNING "NFS: v4 server %s "
1116                                         " returned a bad sequence-id error!\n",
1117                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1118                         exception.retry = 1;
1119                         continue;
1120                 }
1121                 /*
1122                  * BAD_STATEID on OPEN means that the server cancelled our
1123                  * state before it received the OPEN_CONFIRM.
1124                  * Recover by retrying the request as per the discussion
1125                  * on Page 181 of RFC3530.
1126                  */
1127                 if (status == -NFS4ERR_BAD_STATEID) {
1128                         exception.retry = 1;
1129                         continue;
1130                 }
1131                 if (status == -EAGAIN) {
1132                         /* We must have found a delegation */
1133                         exception.retry = 1;
1134                         continue;
1135                 }
1136                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1137                                         status, &exception));
1138         } while (exception.retry);
1139         return res;
1140 }
1141
1142 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1143                             struct nfs_fattr *fattr, struct iattr *sattr,
1144                             struct nfs4_state *state)
1145 {
1146         struct nfs_server *server = NFS_SERVER(inode);
1147         struct nfs_setattrargs  arg = {
1148                 .fh             = NFS_FH(inode),
1149                 .iap            = sattr,
1150                 .server         = server,
1151                 .bitmask = server->attr_bitmask,
1152         };
1153         struct nfs_setattrres  res = {
1154                 .fattr          = fattr,
1155                 .server         = server,
1156         };
1157         struct rpc_message msg = {
1158                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1159                 .rpc_argp       = &arg,
1160                 .rpc_resp       = &res,
1161                 .rpc_cred       = cred,
1162         };
1163         unsigned long timestamp = jiffies;
1164         int status;
1165
1166         nfs_fattr_init(fattr);
1167
1168         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1169                 /* Use that stateid */
1170         } else if (state != NULL) {
1171                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1172         } else
1173                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1174
1175         status = rpc_call_sync(server->client, &msg, 0);
1176         if (status == 0 && state != NULL)
1177                 renew_lease(server, timestamp);
1178         return status;
1179 }
1180
1181 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1182                            struct nfs_fattr *fattr, struct iattr *sattr,
1183                            struct nfs4_state *state)
1184 {
1185         struct nfs_server *server = NFS_SERVER(inode);
1186         struct nfs4_exception exception = { };
1187         int err;
1188         do {
1189                 err = nfs4_handle_exception(server,
1190                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1191                                 &exception);
1192         } while (exception.retry);
1193         return err;
1194 }
1195
1196 struct nfs4_closedata {
1197         struct path path;
1198         struct inode *inode;
1199         struct nfs4_state *state;
1200         struct nfs_closeargs arg;
1201         struct nfs_closeres res;
1202         struct nfs_fattr fattr;
1203         unsigned long timestamp;
1204 };
1205
1206 static void nfs4_free_closedata(void *data)
1207 {
1208         struct nfs4_closedata *calldata = data;
1209         struct nfs4_state_owner *sp = calldata->state->owner;
1210
1211         nfs4_put_open_state(calldata->state);
1212         nfs_free_seqid(calldata->arg.seqid);
1213         nfs4_put_state_owner(sp);
1214         path_put(&calldata->path);
1215         kfree(calldata);
1216 }
1217
1218 static void nfs4_close_done(struct rpc_task *task, void *data)
1219 {
1220         struct nfs4_closedata *calldata = data;
1221         struct nfs4_state *state = calldata->state;
1222         struct nfs_server *server = NFS_SERVER(calldata->inode);
1223
1224         if (RPC_ASSASSINATED(task))
1225                 return;
1226         /* hmm. we are done with the inode, and in the process of freeing
1227          * the state_owner. we keep this around to process errors
1228          */
1229         switch (task->tk_status) {
1230                 case 0:
1231                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1232                         renew_lease(server, calldata->timestamp);
1233                         break;
1234                 case -NFS4ERR_STALE_STATEID:
1235                 case -NFS4ERR_EXPIRED:
1236                         break;
1237                 default:
1238                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1239                                 rpc_restart_call(task);
1240                                 return;
1241                         }
1242         }
1243         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1244 }
1245
1246 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1247 {
1248         struct nfs4_closedata *calldata = data;
1249         struct nfs4_state *state = calldata->state;
1250         int clear_rd, clear_wr, clear_rdwr;
1251
1252         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1253                 return;
1254
1255         clear_rd = clear_wr = clear_rdwr = 0;
1256         spin_lock(&state->owner->so_lock);
1257         /* Calculate the change in open mode */
1258         if (state->n_rdwr == 0) {
1259                 if (state->n_rdonly == 0) {
1260                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1261                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1262                 }
1263                 if (state->n_wronly == 0) {
1264                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1265                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1266                 }
1267         }
1268         spin_unlock(&state->owner->so_lock);
1269         if (!clear_rd && !clear_wr && !clear_rdwr) {
1270                 /* Note: exit _without_ calling nfs4_close_done */
1271                 task->tk_action = NULL;
1272                 return;
1273         }
1274         nfs_fattr_init(calldata->res.fattr);
1275         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1276                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1277                 calldata->arg.open_flags = FMODE_READ;
1278         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1279                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1280                 calldata->arg.open_flags = FMODE_WRITE;
1281         }
1282         calldata->timestamp = jiffies;
1283         rpc_call_start(task);
1284 }
1285
1286 static const struct rpc_call_ops nfs4_close_ops = {
1287         .rpc_call_prepare = nfs4_close_prepare,
1288         .rpc_call_done = nfs4_close_done,
1289         .rpc_release = nfs4_free_closedata,
1290 };
1291
1292 /*
1293  * It is possible for data to be read/written from a mem-mapped file
1294  * after the sys_close call (which hits the vfs layer as a flush).
1295  * This means that we can't safely call nfsv4 close on a file until
1296  * the inode is cleared. This in turn means that we are not good
1297  * NFSv4 citizens - we do not indicate to the server to update the file's
1298  * share state even when we are done with one of the three share
1299  * stateid's in the inode.
1300  *
1301  * NOTE: Caller must be holding the sp->so_owner semaphore!
1302  */
1303 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1304 {
1305         struct nfs_server *server = NFS_SERVER(state->inode);
1306         struct nfs4_closedata *calldata;
1307         struct nfs4_state_owner *sp = state->owner;
1308         struct rpc_task *task;
1309         struct rpc_message msg = {
1310                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1311                 .rpc_cred = state->owner->so_cred,
1312         };
1313         struct rpc_task_setup task_setup_data = {
1314                 .rpc_client = server->client,
1315                 .rpc_message = &msg,
1316                 .callback_ops = &nfs4_close_ops,
1317                 .workqueue = nfsiod_workqueue,
1318                 .flags = RPC_TASK_ASYNC,
1319         };
1320         int status = -ENOMEM;
1321
1322         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1323         if (calldata == NULL)
1324                 goto out;
1325         calldata->inode = state->inode;
1326         calldata->state = state;
1327         calldata->arg.fh = NFS_FH(state->inode);
1328         calldata->arg.stateid = &state->open_stateid;
1329         /* Serialization for the sequence id */
1330         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1331         if (calldata->arg.seqid == NULL)
1332                 goto out_free_calldata;
1333         calldata->arg.bitmask = server->attr_bitmask;
1334         calldata->res.fattr = &calldata->fattr;
1335         calldata->res.seqid = calldata->arg.seqid;
1336         calldata->res.server = server;
1337         calldata->path.mnt = mntget(path->mnt);
1338         calldata->path.dentry = dget(path->dentry);
1339
1340         msg.rpc_argp = &calldata->arg,
1341         msg.rpc_resp = &calldata->res,
1342         task_setup_data.callback_data = calldata;
1343         task = rpc_run_task(&task_setup_data);
1344         if (IS_ERR(task))
1345                 return PTR_ERR(task);
1346         status = 0;
1347         if (wait)
1348                 status = rpc_wait_for_completion_task(task);
1349         rpc_put_task(task);
1350         return status;
1351 out_free_calldata:
1352         kfree(calldata);
1353 out:
1354         nfs4_put_open_state(state);
1355         nfs4_put_state_owner(sp);
1356         return status;
1357 }
1358
1359 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1360 {
1361         struct file *filp;
1362         int ret;
1363
1364         /* If the open_intent is for execute, we have an extra check to make */
1365         if (nd->intent.open.flags & FMODE_EXEC) {
1366                 ret = nfs_may_open(state->inode,
1367                                 state->owner->so_cred,
1368                                 nd->intent.open.flags);
1369                 if (ret < 0)
1370                         goto out_close;
1371         }
1372         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1373         if (!IS_ERR(filp)) {
1374                 struct nfs_open_context *ctx;
1375                 ctx = nfs_file_open_context(filp);
1376                 ctx->state = state;
1377                 return 0;
1378         }
1379         ret = PTR_ERR(filp);
1380 out_close:
1381         nfs4_close_sync(path, state, nd->intent.open.flags);
1382         return ret;
1383 }
1384
1385 struct dentry *
1386 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1387 {
1388         struct path path = {
1389                 .mnt = nd->path.mnt,
1390                 .dentry = dentry,
1391         };
1392         struct dentry *parent;
1393         struct iattr attr;
1394         struct rpc_cred *cred;
1395         struct nfs4_state *state;
1396         struct dentry *res;
1397
1398         if (nd->flags & LOOKUP_CREATE) {
1399                 attr.ia_mode = nd->intent.open.create_mode;
1400                 attr.ia_valid = ATTR_MODE;
1401                 if (!IS_POSIXACL(dir))
1402                         attr.ia_mode &= ~current->fs->umask;
1403         } else {
1404                 attr.ia_valid = 0;
1405                 BUG_ON(nd->intent.open.flags & O_CREAT);
1406         }
1407
1408         cred = rpc_lookup_cred();
1409         if (IS_ERR(cred))
1410                 return (struct dentry *)cred;
1411         parent = dentry->d_parent;
1412         /* Protect against concurrent sillydeletes */
1413         nfs_block_sillyrename(parent);
1414         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1415         put_rpccred(cred);
1416         if (IS_ERR(state)) {
1417                 if (PTR_ERR(state) == -ENOENT) {
1418                         d_add(dentry, NULL);
1419                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1420                 }
1421                 nfs_unblock_sillyrename(parent);
1422                 return (struct dentry *)state;
1423         }
1424         res = d_add_unique(dentry, igrab(state->inode));
1425         if (res != NULL)
1426                 path.dentry = res;
1427         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1428         nfs_unblock_sillyrename(parent);
1429         nfs4_intent_set_file(nd, &path, state);
1430         return res;
1431 }
1432
1433 int
1434 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1435 {
1436         struct path path = {
1437                 .mnt = nd->path.mnt,
1438                 .dentry = dentry,
1439         };
1440         struct rpc_cred *cred;
1441         struct nfs4_state *state;
1442
1443         cred = rpc_lookup_cred();
1444         if (IS_ERR(cred))
1445                 return PTR_ERR(cred);
1446         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1447         put_rpccred(cred);
1448         if (IS_ERR(state)) {
1449                 switch (PTR_ERR(state)) {
1450                         case -EPERM:
1451                         case -EACCES:
1452                         case -EDQUOT:
1453                         case -ENOSPC:
1454                         case -EROFS:
1455                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1456                                 return 1;
1457                         default:
1458                                 goto out_drop;
1459                 }
1460         }
1461         if (state->inode == dentry->d_inode) {
1462                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1463                 nfs4_intent_set_file(nd, &path, state);
1464                 return 1;
1465         }
1466         nfs4_close_sync(&path, state, openflags);
1467 out_drop:
1468         d_drop(dentry);
1469         return 0;
1470 }
1471
1472
1473 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1474 {
1475         struct nfs4_server_caps_res res = {};
1476         struct rpc_message msg = {
1477                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1478                 .rpc_argp = fhandle,
1479                 .rpc_resp = &res,
1480         };
1481         int status;
1482
1483         status = rpc_call_sync(server->client, &msg, 0);
1484         if (status == 0) {
1485                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1486                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1487                         server->caps |= NFS_CAP_ACLS;
1488                 if (res.has_links != 0)
1489                         server->caps |= NFS_CAP_HARDLINKS;
1490                 if (res.has_symlinks != 0)
1491                         server->caps |= NFS_CAP_SYMLINKS;
1492                 server->acl_bitmask = res.acl_bitmask;
1493         }
1494         return status;
1495 }
1496
1497 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1498 {
1499         struct nfs4_exception exception = { };
1500         int err;
1501         do {
1502                 err = nfs4_handle_exception(server,
1503                                 _nfs4_server_capabilities(server, fhandle),
1504                                 &exception);
1505         } while (exception.retry);
1506         return err;
1507 }
1508
1509 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1510                 struct nfs_fsinfo *info)
1511 {
1512         struct nfs4_lookup_root_arg args = {
1513                 .bitmask = nfs4_fattr_bitmap,
1514         };
1515         struct nfs4_lookup_res res = {
1516                 .server = server,
1517                 .fattr = info->fattr,
1518                 .fh = fhandle,
1519         };
1520         struct rpc_message msg = {
1521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1522                 .rpc_argp = &args,
1523                 .rpc_resp = &res,
1524         };
1525         nfs_fattr_init(info->fattr);
1526         return rpc_call_sync(server->client, &msg, 0);
1527 }
1528
1529 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1530                 struct nfs_fsinfo *info)
1531 {
1532         struct nfs4_exception exception = { };
1533         int err;
1534         do {
1535                 err = nfs4_handle_exception(server,
1536                                 _nfs4_lookup_root(server, fhandle, info),
1537                                 &exception);
1538         } while (exception.retry);
1539         return err;
1540 }
1541
1542 /*
1543  * get the file handle for the "/" directory on the server
1544  */
1545 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1546                               struct nfs_fsinfo *info)
1547 {
1548         int status;
1549
1550         status = nfs4_lookup_root(server, fhandle, info);
1551         if (status == 0)
1552                 status = nfs4_server_capabilities(server, fhandle);
1553         if (status == 0)
1554                 status = nfs4_do_fsinfo(server, fhandle, info);
1555         return nfs4_map_errors(status);
1556 }
1557
1558 /*
1559  * Get locations and (maybe) other attributes of a referral.
1560  * Note that we'll actually follow the referral later when
1561  * we detect fsid mismatch in inode revalidation
1562  */
1563 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1564 {
1565         int status = -ENOMEM;
1566         struct page *page = NULL;
1567         struct nfs4_fs_locations *locations = NULL;
1568
1569         page = alloc_page(GFP_KERNEL);
1570         if (page == NULL)
1571                 goto out;
1572         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1573         if (locations == NULL)
1574                 goto out;
1575
1576         status = nfs4_proc_fs_locations(dir, name, locations, page);
1577         if (status != 0)
1578                 goto out;
1579         /* Make sure server returned a different fsid for the referral */
1580         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1581                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1582                 status = -EIO;
1583                 goto out;
1584         }
1585
1586         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1587         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1588         if (!fattr->mode)
1589                 fattr->mode = S_IFDIR;
1590         memset(fhandle, 0, sizeof(struct nfs_fh));
1591 out:
1592         if (page)
1593                 __free_page(page);
1594         if (locations)
1595                 kfree(locations);
1596         return status;
1597 }
1598
1599 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1600 {
1601         struct nfs4_getattr_arg args = {
1602                 .fh = fhandle,
1603                 .bitmask = server->attr_bitmask,
1604         };
1605         struct nfs4_getattr_res res = {
1606                 .fattr = fattr,
1607                 .server = server,
1608         };
1609         struct rpc_message msg = {
1610                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1611                 .rpc_argp = &args,
1612                 .rpc_resp = &res,
1613         };
1614
1615         nfs_fattr_init(fattr);
1616         return rpc_call_sync(server->client, &msg, 0);
1617 }
1618
1619 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1620 {
1621         struct nfs4_exception exception = { };
1622         int err;
1623         do {
1624                 err = nfs4_handle_exception(server,
1625                                 _nfs4_proc_getattr(server, fhandle, fattr),
1626                                 &exception);
1627         } while (exception.retry);
1628         return err;
1629 }
1630
1631 /*
1632  * The file is not closed if it is opened due to the a request to change
1633  * the size of the file. The open call will not be needed once the
1634  * VFS layer lookup-intents are implemented.
1635  *
1636  * Close is called when the inode is destroyed.
1637  * If we haven't opened the file for O_WRONLY, we
1638  * need to in the size_change case to obtain a stateid.
1639  *
1640  * Got race?
1641  * Because OPEN is always done by name in nfsv4, it is
1642  * possible that we opened a different file by the same
1643  * name.  We can recognize this race condition, but we
1644  * can't do anything about it besides returning an error.
1645  *
1646  * This will be fixed with VFS changes (lookup-intent).
1647  */
1648 static int
1649 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1650                   struct iattr *sattr)
1651 {
1652         struct inode *inode = dentry->d_inode;
1653         struct rpc_cred *cred = NULL;
1654         struct nfs4_state *state = NULL;
1655         int status;
1656
1657         nfs_fattr_init(fattr);
1658
1659         /* Search for an existing open(O_WRITE) file */
1660         if (sattr->ia_valid & ATTR_FILE) {
1661                 struct nfs_open_context *ctx;
1662
1663                 ctx = nfs_file_open_context(sattr->ia_file);
1664                 cred = ctx->cred;
1665                 state = ctx->state;
1666         }
1667
1668         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1669         if (status == 0)
1670                 nfs_setattr_update_inode(inode, sattr);
1671         return status;
1672 }
1673
1674 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1675                 const struct qstr *name, struct nfs_fh *fhandle,
1676                 struct nfs_fattr *fattr)
1677 {
1678         int                    status;
1679         struct nfs4_lookup_arg args = {
1680                 .bitmask = server->attr_bitmask,
1681                 .dir_fh = dirfh,
1682                 .name = name,
1683         };
1684         struct nfs4_lookup_res res = {
1685                 .server = server,
1686                 .fattr = fattr,
1687                 .fh = fhandle,
1688         };
1689         struct rpc_message msg = {
1690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1691                 .rpc_argp = &args,
1692                 .rpc_resp = &res,
1693         };
1694
1695         nfs_fattr_init(fattr);
1696
1697         dprintk("NFS call  lookupfh %s\n", name->name);
1698         status = rpc_call_sync(server->client, &msg, 0);
1699         dprintk("NFS reply lookupfh: %d\n", status);
1700         return status;
1701 }
1702
1703 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1704                               struct qstr *name, struct nfs_fh *fhandle,
1705                               struct nfs_fattr *fattr)
1706 {
1707         struct nfs4_exception exception = { };
1708         int err;
1709         do {
1710                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1711                 /* FIXME: !!!! */
1712                 if (err == -NFS4ERR_MOVED) {
1713                         err = -EREMOTE;
1714                         break;
1715                 }
1716                 err = nfs4_handle_exception(server, err, &exception);
1717         } while (exception.retry);
1718         return err;
1719 }
1720
1721 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1722                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1723 {
1724         int status;
1725
1726         dprintk("NFS call  lookup %s\n", name->name);
1727         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1728         if (status == -NFS4ERR_MOVED)
1729                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1730         dprintk("NFS reply lookup: %d\n", status);
1731         return status;
1732 }
1733
1734 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1735 {
1736         struct nfs4_exception exception = { };
1737         int err;
1738         do {
1739                 err = nfs4_handle_exception(NFS_SERVER(dir),
1740                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1741                                 &exception);
1742         } while (exception.retry);
1743         return err;
1744 }
1745
1746 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1747 {
1748         struct nfs_server *server = NFS_SERVER(inode);
1749         struct nfs_fattr fattr;
1750         struct nfs4_accessargs args = {
1751                 .fh = NFS_FH(inode),
1752                 .bitmask = server->attr_bitmask,
1753         };
1754         struct nfs4_accessres res = {
1755                 .server = server,
1756                 .fattr = &fattr,
1757         };
1758         struct rpc_message msg = {
1759                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1760                 .rpc_argp = &args,
1761                 .rpc_resp = &res,
1762                 .rpc_cred = entry->cred,
1763         };
1764         int mode = entry->mask;
1765         int status;
1766
1767         /*
1768          * Determine which access bits we want to ask for...
1769          */
1770         if (mode & MAY_READ)
1771                 args.access |= NFS4_ACCESS_READ;
1772         if (S_ISDIR(inode->i_mode)) {
1773                 if (mode & MAY_WRITE)
1774                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1775                 if (mode & MAY_EXEC)
1776                         args.access |= NFS4_ACCESS_LOOKUP;
1777         } else {
1778                 if (mode & MAY_WRITE)
1779                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1780                 if (mode & MAY_EXEC)
1781                         args.access |= NFS4_ACCESS_EXECUTE;
1782         }
1783         nfs_fattr_init(&fattr);
1784         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1785         if (!status) {
1786                 entry->mask = 0;
1787                 if (res.access & NFS4_ACCESS_READ)
1788                         entry->mask |= MAY_READ;
1789                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1790                         entry->mask |= MAY_WRITE;
1791                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1792                         entry->mask |= MAY_EXEC;
1793                 nfs_refresh_inode(inode, &fattr);
1794         }
1795         return status;
1796 }
1797
1798 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1799 {
1800         struct nfs4_exception exception = { };
1801         int err;
1802         do {
1803                 err = nfs4_handle_exception(NFS_SERVER(inode),
1804                                 _nfs4_proc_access(inode, entry),
1805                                 &exception);
1806         } while (exception.retry);
1807         return err;
1808 }
1809
1810 /*
1811  * TODO: For the time being, we don't try to get any attributes
1812  * along with any of the zero-copy operations READ, READDIR,
1813  * READLINK, WRITE.
1814  *
1815  * In the case of the first three, we want to put the GETATTR
1816  * after the read-type operation -- this is because it is hard
1817  * to predict the length of a GETATTR response in v4, and thus
1818  * align the READ data correctly.  This means that the GETATTR
1819  * may end up partially falling into the page cache, and we should
1820  * shift it into the 'tail' of the xdr_buf before processing.
1821  * To do this efficiently, we need to know the total length
1822  * of data received, which doesn't seem to be available outside
1823  * of the RPC layer.
1824  *
1825  * In the case of WRITE, we also want to put the GETATTR after
1826  * the operation -- in this case because we want to make sure
1827  * we get the post-operation mtime and size.  This means that
1828  * we can't use xdr_encode_pages() as written: we need a variant
1829  * of it which would leave room in the 'tail' iovec.
1830  *
1831  * Both of these changes to the XDR layer would in fact be quite
1832  * minor, but I decided to leave them for a subsequent patch.
1833  */
1834 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1835                 unsigned int pgbase, unsigned int pglen)
1836 {
1837         struct nfs4_readlink args = {
1838                 .fh       = NFS_FH(inode),
1839                 .pgbase   = pgbase,
1840                 .pglen    = pglen,
1841                 .pages    = &page,
1842         };
1843         struct rpc_message msg = {
1844                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1845                 .rpc_argp = &args,
1846                 .rpc_resp = NULL,
1847         };
1848
1849         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1850 }
1851
1852 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1853                 unsigned int pgbase, unsigned int pglen)
1854 {
1855         struct nfs4_exception exception = { };
1856         int err;
1857         do {
1858                 err = nfs4_handle_exception(NFS_SERVER(inode),
1859                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1860                                 &exception);
1861         } while (exception.retry);
1862         return err;
1863 }
1864
1865 /*
1866  * Got race?
1867  * We will need to arrange for the VFS layer to provide an atomic open.
1868  * Until then, this create/open method is prone to inefficiency and race
1869  * conditions due to the lookup, create, and open VFS calls from sys_open()
1870  * placed on the wire.
1871  *
1872  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1873  * The file will be opened again in the subsequent VFS open call
1874  * (nfs4_proc_file_open).
1875  *
1876  * The open for read will just hang around to be used by any process that
1877  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1878  */
1879
1880 static int
1881 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1882                  int flags, struct nameidata *nd)
1883 {
1884         struct path path = {
1885                 .mnt = nd->path.mnt,
1886                 .dentry = dentry,
1887         };
1888         struct nfs4_state *state;
1889         struct rpc_cred *cred;
1890         int status = 0;
1891
1892         cred = rpc_lookup_cred();
1893         if (IS_ERR(cred)) {
1894                 status = PTR_ERR(cred);
1895                 goto out;
1896         }
1897         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1898         d_drop(dentry);
1899         if (IS_ERR(state)) {
1900                 status = PTR_ERR(state);
1901                 goto out_putcred;
1902         }
1903         d_add(dentry, igrab(state->inode));
1904         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1905         if (flags & O_EXCL) {
1906                 struct nfs_fattr fattr;
1907                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
1908                 if (status == 0)
1909                         nfs_setattr_update_inode(state->inode, sattr);
1910                 nfs_post_op_update_inode(state->inode, &fattr);
1911         }
1912         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1913                 status = nfs4_intent_set_file(nd, &path, state);
1914         else
1915                 nfs4_close_sync(&path, state, flags);
1916 out_putcred:
1917         put_rpccred(cred);
1918 out:
1919         return status;
1920 }
1921
1922 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1923 {
1924         struct nfs_server *server = NFS_SERVER(dir);
1925         struct nfs_removeargs args = {
1926                 .fh = NFS_FH(dir),
1927                 .name.len = name->len,
1928                 .name.name = name->name,
1929                 .bitmask = server->attr_bitmask,
1930         };
1931         struct nfs_removeres res = {
1932                 .server = server,
1933         };
1934         struct rpc_message msg = {
1935                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1936                 .rpc_argp = &args,
1937                 .rpc_resp = &res,
1938         };
1939         int                     status;
1940
1941         nfs_fattr_init(&res.dir_attr);
1942         status = rpc_call_sync(server->client, &msg, 0);
1943         if (status == 0) {
1944                 update_changeattr(dir, &res.cinfo);
1945                 nfs_post_op_update_inode(dir, &res.dir_attr);
1946         }
1947         return status;
1948 }
1949
1950 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1951 {
1952         struct nfs4_exception exception = { };
1953         int err;
1954         do {
1955                 err = nfs4_handle_exception(NFS_SERVER(dir),
1956                                 _nfs4_proc_remove(dir, name),
1957                                 &exception);
1958         } while (exception.retry);
1959         return err;
1960 }
1961
1962 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1963 {
1964         struct nfs_server *server = NFS_SERVER(dir);
1965         struct nfs_removeargs *args = msg->rpc_argp;
1966         struct nfs_removeres *res = msg->rpc_resp;
1967
1968         args->bitmask = server->attr_bitmask;
1969         res->server = server;
1970         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1971 }
1972
1973 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1974 {
1975         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1976
1977         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1978                 return 0;
1979         update_changeattr(dir, &res->cinfo);
1980         nfs_post_op_update_inode(dir, &res->dir_attr);
1981         return 1;
1982 }
1983
1984 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1985                 struct inode *new_dir, struct qstr *new_name)
1986 {
1987         struct nfs_server *server = NFS_SERVER(old_dir);
1988         struct nfs4_rename_arg arg = {
1989                 .old_dir = NFS_FH(old_dir),
1990                 .new_dir = NFS_FH(new_dir),
1991                 .old_name = old_name,
1992                 .new_name = new_name,
1993                 .bitmask = server->attr_bitmask,
1994         };
1995         struct nfs_fattr old_fattr, new_fattr;
1996         struct nfs4_rename_res res = {
1997                 .server = server,
1998                 .old_fattr = &old_fattr,
1999                 .new_fattr = &new_fattr,
2000         };
2001         struct rpc_message msg = {
2002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2003                 .rpc_argp = &arg,
2004                 .rpc_resp = &res,
2005         };
2006         int                     status;
2007
2008         nfs_fattr_init(res.old_fattr);
2009         nfs_fattr_init(res.new_fattr);
2010         status = rpc_call_sync(server->client, &msg, 0);
2011
2012         if (!status) {
2013                 update_changeattr(old_dir, &res.old_cinfo);
2014                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2015                 update_changeattr(new_dir, &res.new_cinfo);
2016                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2017         }
2018         return status;
2019 }
2020
2021 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2022                 struct inode *new_dir, struct qstr *new_name)
2023 {
2024         struct nfs4_exception exception = { };
2025         int err;
2026         do {
2027                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2028                                 _nfs4_proc_rename(old_dir, old_name,
2029                                         new_dir, new_name),
2030                                 &exception);
2031         } while (exception.retry);
2032         return err;
2033 }
2034
2035 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2036 {
2037         struct nfs_server *server = NFS_SERVER(inode);
2038         struct nfs4_link_arg arg = {
2039                 .fh     = NFS_FH(inode),
2040                 .dir_fh = NFS_FH(dir),
2041                 .name   = name,
2042                 .bitmask = server->attr_bitmask,
2043         };
2044         struct nfs_fattr fattr, dir_attr;
2045         struct nfs4_link_res res = {
2046                 .server = server,
2047                 .fattr = &fattr,
2048                 .dir_attr = &dir_attr,
2049         };
2050         struct rpc_message msg = {
2051                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2052                 .rpc_argp = &arg,
2053                 .rpc_resp = &res,
2054         };
2055         int                     status;
2056
2057         nfs_fattr_init(res.fattr);
2058         nfs_fattr_init(res.dir_attr);
2059         status = rpc_call_sync(server->client, &msg, 0);
2060         if (!status) {
2061                 update_changeattr(dir, &res.cinfo);
2062                 nfs_post_op_update_inode(dir, res.dir_attr);
2063                 nfs_post_op_update_inode(inode, res.fattr);
2064         }
2065
2066         return status;
2067 }
2068
2069 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2070 {
2071         struct nfs4_exception exception = { };
2072         int err;
2073         do {
2074                 err = nfs4_handle_exception(NFS_SERVER(inode),
2075                                 _nfs4_proc_link(inode, dir, name),
2076                                 &exception);
2077         } while (exception.retry);
2078         return err;
2079 }
2080
2081 struct nfs4_createdata {
2082         struct rpc_message msg;
2083         struct nfs4_create_arg arg;
2084         struct nfs4_create_res res;
2085         struct nfs_fh fh;
2086         struct nfs_fattr fattr;
2087         struct nfs_fattr dir_fattr;
2088 };
2089
2090 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2091                 struct qstr *name, struct iattr *sattr, u32 ftype)
2092 {
2093         struct nfs4_createdata *data;
2094
2095         data = kzalloc(sizeof(*data), GFP_KERNEL);
2096         if (data != NULL) {
2097                 struct nfs_server *server = NFS_SERVER(dir);
2098
2099                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2100                 data->msg.rpc_argp = &data->arg;
2101                 data->msg.rpc_resp = &data->res;
2102                 data->arg.dir_fh = NFS_FH(dir);
2103                 data->arg.server = server;
2104                 data->arg.name = name;
2105                 data->arg.attrs = sattr;
2106                 data->arg.ftype = ftype;
2107                 data->arg.bitmask = server->attr_bitmask;
2108                 data->res.server = server;
2109                 data->res.fh = &data->fh;
2110                 data->res.fattr = &data->fattr;
2111                 data->res.dir_fattr = &data->dir_fattr;
2112                 nfs_fattr_init(data->res.fattr);
2113                 nfs_fattr_init(data->res.dir_fattr);
2114         }
2115         return data;
2116 }
2117
2118 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2119 {
2120         int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2121         if (status == 0) {
2122                 update_changeattr(dir, &data->res.dir_cinfo);
2123                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2124                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2125         }
2126         return status;
2127 }
2128
2129 static void nfs4_free_createdata(struct nfs4_createdata *data)
2130 {
2131         kfree(data);
2132 }
2133
2134 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2135                 struct page *page, unsigned int len, struct iattr *sattr)
2136 {
2137         struct nfs4_createdata *data;
2138         int status = -ENAMETOOLONG;
2139
2140         if (len > NFS4_MAXPATHLEN)
2141                 goto out;
2142
2143         status = -ENOMEM;
2144         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2145         if (data == NULL)
2146                 goto out;
2147
2148         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2149         data->arg.u.symlink.pages = &page;
2150         data->arg.u.symlink.len = len;
2151
2152         status = nfs4_do_create(dir, dentry, data);
2153
2154         nfs4_free_createdata(data);
2155 out:
2156         return status;
2157 }
2158
2159 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2160                 struct page *page, unsigned int len, struct iattr *sattr)
2161 {
2162         struct nfs4_exception exception = { };
2163         int err;
2164         do {
2165                 err = nfs4_handle_exception(NFS_SERVER(dir),
2166                                 _nfs4_proc_symlink(dir, dentry, page,
2167                                                         len, sattr),
2168                                 &exception);
2169         } while (exception.retry);
2170         return err;
2171 }
2172
2173 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2174                 struct iattr *sattr)
2175 {
2176         struct nfs4_createdata *data;
2177         int status = -ENOMEM;
2178
2179         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2180         if (data == NULL)
2181                 goto out;
2182
2183         status = nfs4_do_create(dir, dentry, data);
2184
2185         nfs4_free_createdata(data);
2186 out:
2187         return status;
2188 }
2189
2190 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2191                 struct iattr *sattr)
2192 {
2193         struct nfs4_exception exception = { };
2194         int err;
2195         do {
2196                 err = nfs4_handle_exception(NFS_SERVER(dir),
2197                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2198                                 &exception);
2199         } while (exception.retry);
2200         return err;
2201 }
2202
2203 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2204                   u64 cookie, struct page *page, unsigned int count, int plus)
2205 {
2206         struct inode            *dir = dentry->d_inode;
2207         struct nfs4_readdir_arg args = {
2208                 .fh = NFS_FH(dir),
2209                 .pages = &page,
2210                 .pgbase = 0,
2211                 .count = count,
2212                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2213         };
2214         struct nfs4_readdir_res res;
2215         struct rpc_message msg = {
2216                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2217                 .rpc_argp = &args,
2218                 .rpc_resp = &res,
2219                 .rpc_cred = cred,
2220         };
2221         int                     status;
2222
2223         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2224                         dentry->d_parent->d_name.name,
2225                         dentry->d_name.name,
2226                         (unsigned long long)cookie);
2227         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2228         res.pgbase = args.pgbase;
2229         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2230         if (status == 0)
2231                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2232
2233         nfs_invalidate_atime(dir);
2234
2235         dprintk("%s: returns %d\n", __func__, status);
2236         return status;
2237 }
2238
2239 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2240                   u64 cookie, struct page *page, unsigned int count, int plus)
2241 {
2242         struct nfs4_exception exception = { };
2243         int err;
2244         do {
2245                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2246                                 _nfs4_proc_readdir(dentry, cred, cookie,
2247                                         page, count, plus),
2248                                 &exception);
2249         } while (exception.retry);
2250         return err;
2251 }
2252
2253 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2254                 struct iattr *sattr, dev_t rdev)
2255 {
2256         struct nfs4_createdata *data;
2257         int mode = sattr->ia_mode;
2258         int status = -ENOMEM;
2259
2260         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2261         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2262
2263         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2264         if (data == NULL)
2265                 goto out;
2266
2267         if (S_ISFIFO(mode))
2268                 data->arg.ftype = NF4FIFO;
2269         else if (S_ISBLK(mode)) {
2270                 data->arg.ftype = NF4BLK;
2271                 data->arg.u.device.specdata1 = MAJOR(rdev);
2272                 data->arg.u.device.specdata2 = MINOR(rdev);
2273         }
2274         else if (S_ISCHR(mode)) {
2275                 data->arg.ftype = NF4CHR;
2276                 data->arg.u.device.specdata1 = MAJOR(rdev);
2277                 data->arg.u.device.specdata2 = MINOR(rdev);
2278         }
2279
2280         status = nfs4_do_create(dir, dentry, data);
2281
2282         nfs4_free_createdata(data);
2283 out:
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, struct rpc_message *msg)
2417 {
2418         data->timestamp   = jiffies;
2419         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2420 }
2421
2422 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2423 {
2424         struct inode *inode = data->inode;
2425
2426         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2427                 rpc_restart_call(task);
2428                 return -EAGAIN;
2429         }
2430         if (task->tk_status >= 0) {
2431                 renew_lease(NFS_SERVER(inode), data->timestamp);
2432                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2433         }
2434         return 0;
2435 }
2436
2437 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2438 {
2439         struct nfs_server *server = NFS_SERVER(data->inode);
2440
2441         data->args.bitmask = server->attr_bitmask;
2442         data->res.server = server;
2443         data->timestamp   = jiffies;
2444
2445         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2446 }
2447
2448 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2449 {
2450         struct inode *inode = data->inode;
2451
2452         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2453                 rpc_restart_call(task);
2454                 return -EAGAIN;
2455         }
2456         nfs_refresh_inode(inode, data->res.fattr);
2457         return 0;
2458 }
2459
2460 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2461 {
2462         struct nfs_server *server = NFS_SERVER(data->inode);
2463
2464         data->args.bitmask = server->attr_bitmask;
2465         data->res.server = server;
2466         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2467 }
2468
2469 /*
2470  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2471  * standalone procedure for queueing an asynchronous RENEW.
2472  */
2473 static void nfs4_renew_done(struct rpc_task *task, void *data)
2474 {
2475         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2476         unsigned long timestamp = (unsigned long)data;
2477
2478         if (task->tk_status < 0) {
2479                 switch (task->tk_status) {
2480                         case -NFS4ERR_STALE_CLIENTID:
2481                         case -NFS4ERR_EXPIRED:
2482                         case -NFS4ERR_CB_PATH_DOWN:
2483                                 nfs4_schedule_state_recovery(clp);
2484                 }
2485                 return;
2486         }
2487         spin_lock(&clp->cl_lock);
2488         if (time_before(clp->cl_last_renewal,timestamp))
2489                 clp->cl_last_renewal = timestamp;
2490         spin_unlock(&clp->cl_lock);
2491 }
2492
2493 static const struct rpc_call_ops nfs4_renew_ops = {
2494         .rpc_call_done = nfs4_renew_done,
2495 };
2496
2497 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2498 {
2499         struct rpc_message msg = {
2500                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2501                 .rpc_argp       = clp,
2502                 .rpc_cred       = cred,
2503         };
2504
2505         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2506                         &nfs4_renew_ops, (void *)jiffies);
2507 }
2508
2509 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2510 {
2511         struct rpc_message msg = {
2512                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2513                 .rpc_argp       = clp,
2514                 .rpc_cred       = cred,
2515         };
2516         unsigned long now = jiffies;
2517         int status;
2518
2519         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2520         if (status < 0)
2521                 return status;
2522         spin_lock(&clp->cl_lock);
2523         if (time_before(clp->cl_last_renewal,now))
2524                 clp->cl_last_renewal = now;
2525         spin_unlock(&clp->cl_lock);
2526         return 0;
2527 }
2528
2529 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2530 {
2531         return (server->caps & NFS_CAP_ACLS)
2532                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2533                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2534 }
2535
2536 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2537  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2538  * the stack.
2539  */
2540 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2541
2542 static void buf_to_pages(const void *buf, size_t buflen,
2543                 struct page **pages, unsigned int *pgbase)
2544 {
2545         const void *p = buf;
2546
2547         *pgbase = offset_in_page(buf);
2548         p -= *pgbase;
2549         while (p < buf + buflen) {
2550                 *(pages++) = virt_to_page(p);
2551                 p += PAGE_CACHE_SIZE;
2552         }
2553 }
2554
2555 struct nfs4_cached_acl {
2556         int cached;
2557         size_t len;
2558         char data[0];
2559 };
2560
2561 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2562 {
2563         struct nfs_inode *nfsi = NFS_I(inode);
2564
2565         spin_lock(&inode->i_lock);
2566         kfree(nfsi->nfs4_acl);
2567         nfsi->nfs4_acl = acl;
2568         spin_unlock(&inode->i_lock);
2569 }
2570
2571 static void nfs4_zap_acl_attr(struct inode *inode)
2572 {
2573         nfs4_set_cached_acl(inode, NULL);
2574 }
2575
2576 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2577 {
2578         struct nfs_inode *nfsi = NFS_I(inode);
2579         struct nfs4_cached_acl *acl;
2580         int ret = -ENOENT;
2581
2582         spin_lock(&inode->i_lock);
2583         acl = nfsi->nfs4_acl;
2584         if (acl == NULL)
2585                 goto out;
2586         if (buf == NULL) /* user is just asking for length */
2587                 goto out_len;
2588         if (acl->cached == 0)
2589                 goto out;
2590         ret = -ERANGE; /* see getxattr(2) man page */
2591         if (acl->len > buflen)
2592                 goto out;
2593         memcpy(buf, acl->data, acl->len);
2594 out_len:
2595         ret = acl->len;
2596 out:
2597         spin_unlock(&inode->i_lock);
2598         return ret;
2599 }
2600
2601 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2602 {
2603         struct nfs4_cached_acl *acl;
2604
2605         if (buf && acl_len <= PAGE_SIZE) {
2606                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2607                 if (acl == NULL)
2608                         goto out;
2609                 acl->cached = 1;
2610                 memcpy(acl->data, buf, acl_len);
2611         } else {
2612                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2613                 if (acl == NULL)
2614                         goto out;
2615                 acl->cached = 0;
2616         }
2617         acl->len = acl_len;
2618 out:
2619         nfs4_set_cached_acl(inode, acl);
2620 }
2621
2622 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2623 {
2624         struct page *pages[NFS4ACL_MAXPAGES];
2625         struct nfs_getaclargs args = {
2626                 .fh = NFS_FH(inode),
2627                 .acl_pages = pages,
2628                 .acl_len = buflen,
2629         };
2630         size_t resp_len = buflen;
2631         void *resp_buf;
2632         struct rpc_message msg = {
2633                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2634                 .rpc_argp = &args,
2635                 .rpc_resp = &resp_len,
2636         };
2637         struct page *localpage = NULL;
2638         int ret;
2639
2640         if (buflen < PAGE_SIZE) {
2641                 /* As long as we're doing a round trip to the server anyway,
2642                  * let's be prepared for a page of acl data. */
2643                 localpage = alloc_page(GFP_KERNEL);
2644                 resp_buf = page_address(localpage);
2645                 if (localpage == NULL)
2646                         return -ENOMEM;
2647                 args.acl_pages[0] = localpage;
2648                 args.acl_pgbase = 0;
2649                 resp_len = args.acl_len = PAGE_SIZE;
2650         } else {
2651                 resp_buf = buf;
2652                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2653         }
2654         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2655         if (ret)
2656                 goto out_free;
2657         if (resp_len > args.acl_len)
2658                 nfs4_write_cached_acl(inode, NULL, resp_len);
2659         else
2660                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2661         if (buf) {
2662                 ret = -ERANGE;
2663                 if (resp_len > buflen)
2664                         goto out_free;
2665                 if (localpage)
2666                         memcpy(buf, resp_buf, resp_len);
2667         }
2668         ret = resp_len;
2669 out_free:
2670         if (localpage)
2671                 __free_page(localpage);
2672         return ret;
2673 }
2674
2675 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2676 {
2677         struct nfs4_exception exception = { };
2678         ssize_t ret;
2679         do {
2680                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2681                 if (ret >= 0)
2682                         break;
2683                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2684         } while (exception.retry);
2685         return ret;
2686 }
2687
2688 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2689 {
2690         struct nfs_server *server = NFS_SERVER(inode);
2691         int ret;
2692
2693         if (!nfs4_server_supports_acls(server))
2694                 return -EOPNOTSUPP;
2695         ret = nfs_revalidate_inode(server, inode);
2696         if (ret < 0)
2697                 return ret;
2698         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2699                 nfs_zap_acl_cache(inode);
2700         ret = nfs4_read_cached_acl(inode, buf, buflen);
2701         if (ret != -ENOENT)
2702                 return ret;
2703         return nfs4_get_acl_uncached(inode, buf, buflen);
2704 }
2705
2706 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2707 {
2708         struct nfs_server *server = NFS_SERVER(inode);
2709         struct page *pages[NFS4ACL_MAXPAGES];
2710         struct nfs_setaclargs arg = {
2711                 .fh             = NFS_FH(inode),
2712                 .acl_pages      = pages,
2713                 .acl_len        = buflen,
2714         };
2715         struct rpc_message msg = {
2716                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2717                 .rpc_argp       = &arg,
2718                 .rpc_resp       = NULL,
2719         };
2720         int ret;
2721
2722         if (!nfs4_server_supports_acls(server))
2723                 return -EOPNOTSUPP;
2724         nfs_inode_return_delegation(inode);
2725         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2726         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2727         nfs_access_zap_cache(inode);
2728         nfs_zap_acl_cache(inode);
2729         return ret;
2730 }
2731
2732 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2733 {
2734         struct nfs4_exception exception = { };
2735         int err;
2736         do {
2737                 err = nfs4_handle_exception(NFS_SERVER(inode),
2738                                 __nfs4_proc_set_acl(inode, buf, buflen),
2739                                 &exception);
2740         } while (exception.retry);
2741         return err;
2742 }
2743
2744 static int
2745 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2746 {
2747         struct nfs_client *clp = server->nfs_client;
2748
2749         if (!clp || task->tk_status >= 0)
2750                 return 0;
2751         switch(task->tk_status) {
2752                 case -NFS4ERR_STALE_CLIENTID:
2753                 case -NFS4ERR_STALE_STATEID:
2754                 case -NFS4ERR_EXPIRED:
2755                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2756                         nfs4_schedule_state_recovery(clp);
2757                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2758                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2759                         task->tk_status = 0;
2760                         return -EAGAIN;
2761                 case -NFS4ERR_DELAY:
2762                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2763                 case -NFS4ERR_GRACE:
2764                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2765                         task->tk_status = 0;
2766                         return -EAGAIN;
2767                 case -NFS4ERR_OLD_STATEID:
2768                         task->tk_status = 0;
2769                         return -EAGAIN;
2770         }
2771         task->tk_status = nfs4_map_errors(task->tk_status);
2772         return 0;
2773 }
2774
2775 static int nfs4_wait_bit_killable(void *word)
2776 {
2777         if (fatal_signal_pending(current))
2778                 return -ERESTARTSYS;
2779         schedule();
2780         return 0;
2781 }
2782
2783 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2784 {
2785         int res;
2786
2787         might_sleep();
2788
2789         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2790
2791         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2792                         nfs4_wait_bit_killable, TASK_KILLABLE);
2793
2794         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2795         return res;
2796 }
2797
2798 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2799 {
2800         int res = 0;
2801
2802         might_sleep();
2803
2804         if (*timeout <= 0)
2805                 *timeout = NFS4_POLL_RETRY_MIN;
2806         if (*timeout > NFS4_POLL_RETRY_MAX)
2807                 *timeout = NFS4_POLL_RETRY_MAX;
2808         schedule_timeout_killable(*timeout);
2809         if (fatal_signal_pending(current))
2810                 res = -ERESTARTSYS;
2811         *timeout <<= 1;
2812         return res;
2813 }
2814
2815 /* This is the error handling routine for processes that are allowed
2816  * to sleep.
2817  */
2818 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2819 {
2820         struct nfs_client *clp = server->nfs_client;
2821         int ret = errorcode;
2822
2823         exception->retry = 0;
2824         switch(errorcode) {
2825                 case 0:
2826                         return 0;
2827                 case -NFS4ERR_STALE_CLIENTID:
2828                 case -NFS4ERR_STALE_STATEID:
2829                 case -NFS4ERR_EXPIRED:
2830                         nfs4_schedule_state_recovery(clp);
2831                         ret = nfs4_wait_clnt_recover(server->client, clp);
2832                         if (ret == 0)
2833                                 exception->retry = 1;
2834                         break;
2835                 case -NFS4ERR_FILE_OPEN:
2836                 case -NFS4ERR_GRACE:
2837                 case -NFS4ERR_DELAY:
2838                         ret = nfs4_delay(server->client, &exception->timeout);
2839                         if (ret != 0)
2840                                 break;
2841                 case -NFS4ERR_OLD_STATEID:
2842                         exception->retry = 1;
2843         }
2844         /* We failed to handle the error */
2845         return nfs4_map_errors(ret);
2846 }
2847
2848 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2849 {
2850         nfs4_verifier sc_verifier;
2851         struct nfs4_setclientid setclientid = {
2852                 .sc_verifier = &sc_verifier,
2853                 .sc_prog = program,
2854         };
2855         struct rpc_message msg = {
2856                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2857                 .rpc_argp = &setclientid,
2858                 .rpc_resp = clp,
2859                 .rpc_cred = cred,
2860         };
2861         __be32 *p;
2862         int loop = 0;
2863         int status;
2864
2865         p = (__be32*)sc_verifier.data;
2866         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2867         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2868
2869         for(;;) {
2870                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2871                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2872                                 clp->cl_ipaddr,
2873                                 rpc_peeraddr2str(clp->cl_rpcclient,
2874                                                         RPC_DISPLAY_ADDR),
2875                                 rpc_peeraddr2str(clp->cl_rpcclient,
2876                                                         RPC_DISPLAY_PROTO),
2877                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2878                                 clp->cl_id_uniquifier);
2879                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2880                                 sizeof(setclientid.sc_netid),
2881                                 rpc_peeraddr2str(clp->cl_rpcclient,
2882                                                         RPC_DISPLAY_NETID));
2883                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2884                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2885                                 clp->cl_ipaddr, port >> 8, port & 255);
2886
2887                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2888                 if (status != -NFS4ERR_CLID_INUSE)
2889                         break;
2890                 if (signalled())
2891                         break;
2892                 if (loop++ & 1)
2893                         ssleep(clp->cl_lease_time + 1);
2894                 else
2895                         if (++clp->cl_id_uniquifier == 0)
2896                                 break;
2897         }
2898         return status;
2899 }
2900
2901 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2902 {
2903         struct nfs_fsinfo fsinfo;
2904         struct rpc_message msg = {
2905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2906                 .rpc_argp = clp,
2907                 .rpc_resp = &fsinfo,
2908                 .rpc_cred = cred,
2909         };
2910         unsigned long now;
2911         int status;
2912
2913         now = jiffies;
2914         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2915         if (status == 0) {
2916                 spin_lock(&clp->cl_lock);
2917                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2918                 clp->cl_last_renewal = now;
2919                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2920                 spin_unlock(&clp->cl_lock);
2921         }
2922         return status;
2923 }
2924
2925 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2926 {
2927         long timeout = 0;
2928         int err;
2929         do {
2930                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2931                 switch (err) {
2932                         case 0:
2933                                 return err;
2934                         case -NFS4ERR_RESOURCE:
2935                                 /* The IBM lawyers misread another document! */
2936                         case -NFS4ERR_DELAY:
2937                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2938                 }
2939         } while (err == 0);
2940         return err;
2941 }
2942
2943 struct nfs4_delegreturndata {
2944         struct nfs4_delegreturnargs args;
2945         struct nfs4_delegreturnres res;
2946         struct nfs_fh fh;
2947         nfs4_stateid stateid;
2948         unsigned long timestamp;
2949         struct nfs_fattr fattr;
2950         int rpc_status;
2951 };
2952
2953 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2954 {
2955         struct nfs4_delegreturndata *data = calldata;
2956         data->rpc_status = task->tk_status;
2957         if (data->rpc_status == 0)
2958                 renew_lease(data->res.server, data->timestamp);
2959 }
2960
2961 static void nfs4_delegreturn_release(void *calldata)
2962 {
2963         kfree(calldata);
2964 }
2965
2966 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2967         .rpc_call_done = nfs4_delegreturn_done,
2968         .rpc_release = nfs4_delegreturn_release,
2969 };
2970
2971 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
2972 {
2973         struct nfs4_delegreturndata *data;
2974         struct nfs_server *server = NFS_SERVER(inode);
2975         struct rpc_task *task;
2976         struct rpc_message msg = {
2977                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2978                 .rpc_cred = cred,
2979         };
2980         struct rpc_task_setup task_setup_data = {
2981                 .rpc_client = server->client,
2982                 .rpc_message = &msg,
2983                 .callback_ops = &nfs4_delegreturn_ops,
2984                 .flags = RPC_TASK_ASYNC,
2985         };
2986         int status = 0;
2987
2988         data = kmalloc(sizeof(*data), GFP_KERNEL);
2989         if (data == NULL)
2990                 return -ENOMEM;
2991         data->args.fhandle = &data->fh;
2992         data->args.stateid = &data->stateid;
2993         data->args.bitmask = server->attr_bitmask;
2994         nfs_copy_fh(&data->fh, NFS_FH(inode));
2995         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2996         data->res.fattr = &data->fattr;
2997         data->res.server = server;
2998         nfs_fattr_init(data->res.fattr);
2999         data->timestamp = jiffies;
3000         data->rpc_status = 0;
3001
3002         task_setup_data.callback_data = data;
3003         msg.rpc_argp = &data->args,
3004         msg.rpc_resp = &data->res,
3005         task = rpc_run_task(&task_setup_data);
3006         if (IS_ERR(task))
3007                 return PTR_ERR(task);
3008         if (!issync)
3009                 goto out;
3010         status = nfs4_wait_for_completion_rpc_task(task);
3011         if (status != 0)
3012                 goto out;
3013         status = data->rpc_status;
3014         if (status != 0)
3015                 goto out;
3016         nfs_refresh_inode(inode, &data->fattr);
3017 out:
3018         rpc_put_task(task);
3019         return status;
3020 }
3021
3022 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3023 {
3024         struct nfs_server *server = NFS_SERVER(inode);
3025         struct nfs4_exception exception = { };
3026         int err;
3027         do {
3028                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3029                 switch (err) {
3030                         case -NFS4ERR_STALE_STATEID:
3031                         case -NFS4ERR_EXPIRED:
3032                         case 0:
3033                                 return 0;
3034                 }
3035                 err = nfs4_handle_exception(server, err, &exception);
3036         } while (exception.retry);
3037         return err;
3038 }
3039
3040 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3041 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3042
3043 /*
3044  * sleep, with exponential backoff, and retry the LOCK operation.
3045  */
3046 static unsigned long
3047 nfs4_set_lock_task_retry(unsigned long timeout)
3048 {
3049         schedule_timeout_killable(timeout);
3050         timeout <<= 1;
3051         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3052                 return NFS4_LOCK_MAXTIMEOUT;
3053         return timeout;
3054 }
3055
3056 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3057 {
3058         struct inode *inode = state->inode;
3059         struct nfs_server *server = NFS_SERVER(inode);
3060         struct nfs_client *clp = server->nfs_client;
3061         struct nfs_lockt_args arg = {
3062                 .fh = NFS_FH(inode),
3063                 .fl = request,
3064         };
3065         struct nfs_lockt_res res = {
3066                 .denied = request,
3067         };
3068         struct rpc_message msg = {
3069                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3070                 .rpc_argp       = &arg,
3071                 .rpc_resp       = &res,
3072                 .rpc_cred       = state->owner->so_cred,
3073         };
3074         struct nfs4_lock_state *lsp;
3075         int status;
3076
3077         down_read(&clp->cl_sem);
3078         arg.lock_owner.clientid = clp->cl_clientid;
3079         status = nfs4_set_lock_state(state, request);
3080         if (status != 0)
3081                 goto out;
3082         lsp = request->fl_u.nfs4_fl.owner;
3083         arg.lock_owner.id = lsp->ls_id.id;
3084         status = rpc_call_sync(server->client, &msg, 0);
3085         switch (status) {
3086                 case 0:
3087                         request->fl_type = F_UNLCK;
3088                         break;
3089                 case -NFS4ERR_DENIED:
3090                         status = 0;
3091         }
3092         request->fl_ops->fl_release_private(request);
3093 out:
3094         up_read(&clp->cl_sem);
3095         return status;
3096 }
3097
3098 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3099 {
3100         struct nfs4_exception exception = { };
3101         int err;
3102
3103         do {
3104                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3105                                 _nfs4_proc_getlk(state, cmd, request),
3106                                 &exception);
3107         } while (exception.retry);
3108         return err;
3109 }
3110
3111 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3112 {
3113         int res = 0;
3114         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3115                 case FL_POSIX:
3116                         res = posix_lock_file_wait(file, fl);
3117                         break;
3118                 case FL_FLOCK:
3119                         res = flock_lock_file_wait(file, fl);
3120                         break;
3121                 default:
3122                         BUG();
3123         }
3124         return res;
3125 }
3126
3127 struct nfs4_unlockdata {
3128         struct nfs_locku_args arg;
3129         struct nfs_locku_res res;
3130         struct nfs4_lock_state *lsp;
3131         struct nfs_open_context *ctx;
3132         struct file_lock fl;
3133         const struct nfs_server *server;
3134         unsigned long timestamp;
3135 };
3136
3137 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3138                 struct nfs_open_context *ctx,
3139                 struct nfs4_lock_state *lsp,
3140                 struct nfs_seqid *seqid)
3141 {
3142         struct nfs4_unlockdata *p;
3143         struct inode *inode = lsp->ls_state->inode;
3144
3145         p = kmalloc(sizeof(*p), GFP_KERNEL);
3146         if (p == NULL)
3147                 return NULL;
3148         p->arg.fh = NFS_FH(inode);
3149         p->arg.fl = &p->fl;
3150         p->arg.seqid = seqid;
3151         p->res.seqid = seqid;
3152         p->arg.stateid = &lsp->ls_stateid;
3153         p->lsp = lsp;
3154         atomic_inc(&lsp->ls_count);
3155         /* Ensure we don't close file until we're done freeing locks! */
3156         p->ctx = get_nfs_open_context(ctx);
3157         memcpy(&p->fl, fl, sizeof(p->fl));
3158         p->server = NFS_SERVER(inode);
3159         return p;
3160 }
3161
3162 static void nfs4_locku_release_calldata(void *data)
3163 {
3164         struct nfs4_unlockdata *calldata = data;
3165         nfs_free_seqid(calldata->arg.seqid);
3166         nfs4_put_lock_state(calldata->lsp);
3167         put_nfs_open_context(calldata->ctx);
3168         kfree(calldata);
3169 }
3170
3171 static void nfs4_locku_done(struct rpc_task *task, void *data)
3172 {
3173         struct nfs4_unlockdata *calldata = data;
3174
3175         if (RPC_ASSASSINATED(task))
3176                 return;
3177         switch (task->tk_status) {
3178                 case 0:
3179                         memcpy(calldata->lsp->ls_stateid.data,
3180                                         calldata->res.stateid.data,
3181                                         sizeof(calldata->lsp->ls_stateid.data));
3182                         renew_lease(calldata->server, calldata->timestamp);
3183                         break;
3184                 case -NFS4ERR_STALE_STATEID:
3185                 case -NFS4ERR_EXPIRED:
3186                         break;
3187                 default:
3188                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3189                                 rpc_restart_call(task);
3190         }
3191 }
3192
3193 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3194 {
3195         struct nfs4_unlockdata *calldata = data;
3196
3197         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3198                 return;
3199         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3200                 /* Note: exit _without_ running nfs4_locku_done */
3201                 task->tk_action = NULL;
3202                 return;
3203         }
3204         calldata->timestamp = jiffies;
3205         rpc_call_start(task);
3206 }
3207
3208 static const struct rpc_call_ops nfs4_locku_ops = {
3209         .rpc_call_prepare = nfs4_locku_prepare,
3210         .rpc_call_done = nfs4_locku_done,
3211         .rpc_release = nfs4_locku_release_calldata,
3212 };
3213
3214 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3215                 struct nfs_open_context *ctx,
3216                 struct nfs4_lock_state *lsp,
3217                 struct nfs_seqid *seqid)
3218 {
3219         struct nfs4_unlockdata *data;
3220         struct rpc_message msg = {
3221                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3222                 .rpc_cred = ctx->cred,
3223         };
3224         struct rpc_task_setup task_setup_data = {
3225                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3226                 .rpc_message = &msg,
3227                 .callback_ops = &nfs4_locku_ops,
3228                 .workqueue = nfsiod_workqueue,
3229                 .flags = RPC_TASK_ASYNC,
3230         };
3231
3232         /* Ensure this is an unlock - when canceling a lock, the
3233          * canceled lock is passed in, and it won't be an unlock.
3234          */
3235         fl->fl_type = F_UNLCK;
3236
3237         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3238         if (data == NULL) {
3239                 nfs_free_seqid(seqid);
3240                 return ERR_PTR(-ENOMEM);
3241         }
3242
3243         msg.rpc_argp = &data->arg,
3244         msg.rpc_resp = &data->res,
3245         task_setup_data.callback_data = data;
3246         return rpc_run_task(&task_setup_data);
3247 }
3248
3249 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3250 {
3251         struct nfs_seqid *seqid;
3252         struct nfs4_lock_state *lsp;
3253         struct rpc_task *task;
3254         int status = 0;
3255         unsigned char fl_flags = request->fl_flags;
3256
3257         status = nfs4_set_lock_state(state, request);
3258         /* Unlock _before_ we do the RPC call */
3259         request->fl_flags |= FL_EXISTS;
3260         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3261                 goto out;
3262         if (status != 0)
3263                 goto out;
3264         /* Is this a delegated lock? */
3265         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3266                 goto out;
3267         lsp = request->fl_u.nfs4_fl.owner;
3268         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3269         status = -ENOMEM;
3270         if (seqid == NULL)
3271                 goto out;
3272         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3273         status = PTR_ERR(task);
3274         if (IS_ERR(task))
3275                 goto out;
3276         status = nfs4_wait_for_completion_rpc_task(task);
3277         rpc_put_task(task);
3278 out:
3279         request->fl_flags = fl_flags;
3280         return status;
3281 }
3282
3283 struct nfs4_lockdata {
3284         struct nfs_lock_args arg;
3285         struct nfs_lock_res res;
3286         struct nfs4_lock_state *lsp;
3287         struct nfs_open_context *ctx;
3288         struct file_lock fl;
3289         unsigned long timestamp;
3290         int rpc_status;
3291         int cancelled;
3292 };
3293
3294 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3295                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3296 {
3297         struct nfs4_lockdata *p;
3298         struct inode *inode = lsp->ls_state->inode;
3299         struct nfs_server *server = NFS_SERVER(inode);
3300
3301         p = kzalloc(sizeof(*p), GFP_KERNEL);
3302         if (p == NULL)
3303                 return NULL;
3304
3305         p->arg.fh = NFS_FH(inode);
3306         p->arg.fl = &p->fl;
3307         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3308         if (p->arg.open_seqid == NULL)
3309                 goto out_free;
3310         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3311         if (p->arg.lock_seqid == NULL)
3312                 goto out_free_seqid;
3313         p->arg.lock_stateid = &lsp->ls_stateid;
3314         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3315         p->arg.lock_owner.id = lsp->ls_id.id;
3316         p->res.lock_seqid = p->arg.lock_seqid;
3317         p->lsp = lsp;
3318         atomic_inc(&lsp->ls_count);
3319         p->ctx = get_nfs_open_context(ctx);
3320         memcpy(&p->fl, fl, sizeof(p->fl));
3321         return p;
3322 out_free_seqid:
3323         nfs_free_seqid(p->arg.open_seqid);
3324 out_free:
3325         kfree(p);
3326         return NULL;
3327 }
3328
3329 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3330 {
3331         struct nfs4_lockdata *data = calldata;
3332         struct nfs4_state *state = data->lsp->ls_state;
3333
3334         dprintk("%s: begin!\n", __func__);
3335         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3336                 return;
3337         /* Do we need to do an open_to_lock_owner? */
3338         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3339                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3340                         return;
3341                 data->arg.open_stateid = &state->stateid;
3342                 data->arg.new_lock_owner = 1;
3343                 data->res.open_seqid = data->arg.open_seqid;
3344         } else
3345                 data->arg.new_lock_owner = 0;
3346         data->timestamp = jiffies;
3347         rpc_call_start(task);
3348         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3349 }
3350
3351 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3352 {
3353         struct nfs4_lockdata *data = calldata;
3354
3355         dprintk("%s: begin!\n", __func__);
3356
3357         data->rpc_status = task->tk_status;
3358         if (RPC_ASSASSINATED(task))
3359                 goto out;
3360         if (data->arg.new_lock_owner != 0) {
3361                 if (data->rpc_status == 0)
3362                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3363                 else
3364                         goto out;
3365         }
3366         if (data->rpc_status == 0) {
3367                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3368                                         sizeof(data->lsp->ls_stateid.data));
3369                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3370                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3371         }
3372 out:
3373         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3374 }
3375
3376 static void nfs4_lock_release(void *calldata)
3377 {
3378         struct nfs4_lockdata *data = calldata;
3379
3380         dprintk("%s: begin!\n", __func__);
3381         nfs_free_seqid(data->arg.open_seqid);
3382         if (data->cancelled != 0) {
3383                 struct rpc_task *task;
3384                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3385                                 data->arg.lock_seqid);
3386                 if (!IS_ERR(task))
3387                         rpc_put_task(task);
3388                 dprintk("%s: cancelling lock!\n", __func__);
3389         } else
3390                 nfs_free_seqid(data->arg.lock_seqid);
3391         nfs4_put_lock_state(data->lsp);
3392         put_nfs_open_context(data->ctx);
3393         kfree(data);
3394         dprintk("%s: done!\n", __func__);
3395 }
3396
3397 static const struct rpc_call_ops nfs4_lock_ops = {
3398         .rpc_call_prepare = nfs4_lock_prepare,
3399         .rpc_call_done = nfs4_lock_done,
3400         .rpc_release = nfs4_lock_release,
3401 };
3402
3403 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3404 {
3405         struct nfs4_lockdata *data;
3406         struct rpc_task *task;
3407         struct rpc_message msg = {
3408                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3409                 .rpc_cred = state->owner->so_cred,
3410         };
3411         struct rpc_task_setup task_setup_data = {
3412                 .rpc_client = NFS_CLIENT(state->inode),
3413                 .rpc_message = &msg,
3414                 .callback_ops = &nfs4_lock_ops,
3415                 .workqueue = nfsiod_workqueue,
3416                 .flags = RPC_TASK_ASYNC,
3417         };
3418         int ret;
3419
3420         dprintk("%s: begin!\n", __func__);
3421         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3422                         fl->fl_u.nfs4_fl.owner);
3423         if (data == NULL)
3424                 return -ENOMEM;
3425         if (IS_SETLKW(cmd))
3426                 data->arg.block = 1;
3427         if (reclaim != 0)
3428                 data->arg.reclaim = 1;
3429         msg.rpc_argp = &data->arg,
3430         msg.rpc_resp = &data->res,
3431         task_setup_data.callback_data = data;
3432         task = rpc_run_task(&task_setup_data);
3433         if (IS_ERR(task))
3434                 return PTR_ERR(task);
3435         ret = nfs4_wait_for_completion_rpc_task(task);
3436         if (ret == 0) {
3437                 ret = data->rpc_status;
3438                 if (ret == -NFS4ERR_DENIED)
3439                         ret = -EAGAIN;
3440         } else
3441                 data->cancelled = 1;
3442         rpc_put_task(task);
3443         dprintk("%s: done, ret = %d!\n", __func__, ret);
3444         return ret;
3445 }
3446
3447 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3448 {
3449         struct nfs_server *server = NFS_SERVER(state->inode);
3450         struct nfs4_exception exception = { };
3451         int err;
3452
3453         do {
3454                 /* Cache the lock if possible... */
3455                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3456                         return 0;
3457                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3458                 if (err != -NFS4ERR_DELAY)
3459                         break;
3460                 nfs4_handle_exception(server, err, &exception);
3461         } while (exception.retry);
3462         return err;
3463 }
3464
3465 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3466 {
3467         struct nfs_server *server = NFS_SERVER(state->inode);
3468         struct nfs4_exception exception = { };
3469         int err;
3470
3471         err = nfs4_set_lock_state(state, request);
3472         if (err != 0)
3473                 return err;
3474         do {
3475                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3476                         return 0;
3477                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
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_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3486 {
3487         struct nfs_client *clp = state->owner->so_client;
3488         unsigned char fl_flags = request->fl_flags;
3489         int status;
3490
3491         /* Is this a delegated open? */
3492         status = nfs4_set_lock_state(state, request);
3493         if (status != 0)
3494                 goto out;
3495         request->fl_flags |= FL_ACCESS;
3496         status = do_vfs_lock(request->fl_file, request);
3497         if (status < 0)
3498                 goto out;
3499         down_read(&clp->cl_sem);
3500         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3501                 struct nfs_inode *nfsi = NFS_I(state->inode);
3502                 /* Yes: cache locks! */
3503                 down_read(&nfsi->rwsem);
3504                 /* ...but avoid races with delegation recall... */
3505                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3506                         request->fl_flags = fl_flags & ~FL_SLEEP;
3507                         status = do_vfs_lock(request->fl_file, request);
3508                         up_read(&nfsi->rwsem);
3509                         goto out_unlock;
3510                 }
3511                 up_read(&nfsi->rwsem);
3512         }
3513         status = _nfs4_do_setlk(state, cmd, request, 0);
3514         if (status != 0)
3515                 goto out_unlock;
3516         /* Note: we always want to sleep here! */
3517         request->fl_flags = fl_flags | FL_SLEEP;
3518         if (do_vfs_lock(request->fl_file, request) < 0)
3519                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3520 out_unlock:
3521         up_read(&clp->cl_sem);
3522 out:
3523         request->fl_flags = fl_flags;
3524         return status;
3525 }
3526
3527 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3528 {
3529         struct nfs4_exception exception = { };
3530         int err;
3531
3532         do {
3533                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3534                                 _nfs4_proc_setlk(state, cmd, request),
3535                                 &exception);
3536         } while (exception.retry);
3537         return err;
3538 }
3539
3540 static int
3541 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3542 {
3543         struct nfs_open_context *ctx;
3544         struct nfs4_state *state;
3545         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3546         int status;
3547
3548         /* verify open state */
3549         ctx = nfs_file_open_context(filp);
3550         state = ctx->state;
3551
3552         if (request->fl_start < 0 || request->fl_end < 0)
3553                 return -EINVAL;
3554
3555         if (IS_GETLK(cmd))
3556                 return nfs4_proc_getlk(state, F_GETLK, request);
3557
3558         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3559                 return -EINVAL;
3560
3561         if (request->fl_type == F_UNLCK)
3562                 return nfs4_proc_unlck(state, cmd, request);
3563
3564         do {
3565                 status = nfs4_proc_setlk(state, cmd, request);
3566                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3567                         break;
3568                 timeout = nfs4_set_lock_task_retry(timeout);
3569                 status = -ERESTARTSYS;
3570                 if (signalled())
3571                         break;
3572         } while(status < 0);
3573         return status;
3574 }
3575
3576 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3577 {
3578         struct nfs_server *server = NFS_SERVER(state->inode);
3579         struct nfs4_exception exception = { };
3580         int err;
3581
3582         err = nfs4_set_lock_state(state, fl);
3583         if (err != 0)
3584                 goto out;
3585         do {
3586                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3587                 if (err != -NFS4ERR_DELAY)
3588                         break;
3589                 err = nfs4_handle_exception(server, err, &exception);
3590         } while (exception.retry);
3591 out:
3592         return err;
3593 }
3594
3595 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3596
3597 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3598                 size_t buflen, int flags)
3599 {
3600         struct inode *inode = dentry->d_inode;
3601
3602         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3603                 return -EOPNOTSUPP;
3604
3605         return nfs4_proc_set_acl(inode, buf, buflen);
3606 }
3607
3608 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3609  * and that's what we'll do for e.g. user attributes that haven't been set.
3610  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3611  * attributes in kernel-managed attribute namespaces. */
3612 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3613                 size_t buflen)
3614 {
3615         struct inode *inode = dentry->d_inode;
3616
3617         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3618                 return -EOPNOTSUPP;
3619
3620         return nfs4_proc_get_acl(inode, buf, buflen);
3621 }
3622
3623 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3624 {
3625         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3626
3627         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3628                 return 0;
3629         if (buf && buflen < len)
3630                 return -ERANGE;
3631         if (buf)
3632                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3633         return len;
3634 }
3635
3636 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3637                 struct nfs4_fs_locations *fs_locations, struct page *page)
3638 {
3639         struct nfs_server *server = NFS_SERVER(dir);
3640         u32 bitmask[2] = {
3641                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3642                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3643         };
3644         struct nfs4_fs_locations_arg args = {
3645                 .dir_fh = NFS_FH(dir),
3646                 .name = name,
3647                 .page = page,
3648                 .bitmask = bitmask,
3649         };
3650         struct rpc_message msg = {
3651                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3652                 .rpc_argp = &args,
3653                 .rpc_resp = fs_locations,
3654         };
3655         int status;
3656
3657         dprintk("%s: start\n", __func__);
3658         nfs_fattr_init(&fs_locations->fattr);
3659         fs_locations->server = server;
3660         fs_locations->nlocations = 0;
3661         status = rpc_call_sync(server->client, &msg, 0);
3662         dprintk("%s: returned status = %d\n", __func__, status);
3663         return status;
3664 }
3665
3666 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3667         .recover_open   = nfs4_open_reclaim,
3668         .recover_lock   = nfs4_lock_reclaim,
3669 };
3670
3671 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3672         .recover_open   = nfs4_open_expired,
3673         .recover_lock   = nfs4_lock_expired,
3674 };
3675
3676 static const struct inode_operations nfs4_file_inode_operations = {
3677         .permission     = nfs_permission,
3678         .getattr        = nfs_getattr,
3679         .setattr        = nfs_setattr,
3680         .getxattr       = nfs4_getxattr,
3681         .setxattr       = nfs4_setxattr,
3682         .listxattr      = nfs4_listxattr,
3683 };
3684
3685 const struct nfs_rpc_ops nfs_v4_clientops = {
3686         .version        = 4,                    /* protocol version */
3687         .dentry_ops     = &nfs4_dentry_operations,
3688         .dir_inode_ops  = &nfs4_dir_inode_operations,
3689         .file_inode_ops = &nfs4_file_inode_operations,
3690         .getroot        = nfs4_proc_get_root,
3691         .getattr        = nfs4_proc_getattr,
3692         .setattr        = nfs4_proc_setattr,
3693         .lookupfh       = nfs4_proc_lookupfh,
3694         .lookup         = nfs4_proc_lookup,
3695         .access         = nfs4_proc_access,
3696         .readlink       = nfs4_proc_readlink,
3697         .create         = nfs4_proc_create,
3698         .remove         = nfs4_proc_remove,
3699         .unlink_setup   = nfs4_proc_unlink_setup,
3700         .unlink_done    = nfs4_proc_unlink_done,
3701         .rename         = nfs4_proc_rename,
3702         .link           = nfs4_proc_link,
3703         .symlink        = nfs4_proc_symlink,
3704         .mkdir          = nfs4_proc_mkdir,
3705         .rmdir          = nfs4_proc_remove,
3706         .readdir        = nfs4_proc_readdir,
3707         .mknod          = nfs4_proc_mknod,
3708         .statfs         = nfs4_proc_statfs,
3709         .fsinfo         = nfs4_proc_fsinfo,
3710         .pathconf       = nfs4_proc_pathconf,
3711         .set_capabilities = nfs4_server_capabilities,
3712         .decode_dirent  = nfs4_decode_dirent,
3713         .read_setup     = nfs4_proc_read_setup,
3714         .read_done      = nfs4_read_done,
3715         .write_setup    = nfs4_proc_write_setup,
3716         .write_done     = nfs4_write_done,
3717         .commit_setup   = nfs4_proc_commit_setup,
3718         .commit_done    = nfs4_commit_done,
3719         .lock           = nfs4_proc_lock,
3720         .clear_acl_cache = nfs4_zap_acl_attr,
3721 };
3722
3723 /*
3724  * Local variables:
3725  *  c-basic-offset: 8
3726  * End:
3727  */