fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  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                                 __FUNCTION__, -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->before == nfsi->change_attr && cinfo->atomic)
 214                 nfsi->change_attr = cinfo->after;
 215         spin_unlock(&dir->i_lock);
 216 }
 217
 218 struct nfs4_opendata {
 219         struct kref kref;
 220         struct nfs_openargs o_arg;
 221         struct nfs_openres o_res;
 222         struct nfs_open_confirmargs c_arg;
 223         struct nfs_open_confirmres c_res;
 224         struct nfs_fattr f_attr;
 225         struct nfs_fattr dir_attr;
 226         struct path path;
 227         struct dentry *dir;
 228         struct nfs4_state_owner *owner;
 229         struct nfs4_state *state;
 230         struct iattr attrs;
 231         unsigned long timestamp;
 232         unsigned int rpc_done : 1;
 233         int rpc_status;
 234         int cancelled;
 235 };
 236
 237
 238 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 239 {
 240         p->o_res.f_attr = &p->f_attr;
 241         p->o_res.dir_attr = &p->dir_attr;
 242         p->o_res.server = p->o_arg.server;
 243         nfs_fattr_init(&p->f_attr);
 244         nfs_fattr_init(&p->dir_attr);
 245 }
 246
 247 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 248                 struct nfs4_state_owner *sp, int flags,
 249                 const struct iattr *attrs)
 250 {
 251         struct dentry *parent = dget_parent(path->dentry);
 252         struct inode *dir = parent->d_inode;
 253         struct nfs_server *server = NFS_SERVER(dir);
 254         struct nfs4_opendata *p;
 255
 256         p = kzalloc(sizeof(*p), GFP_KERNEL);
 257         if (p == NULL)
 258                 goto err;
 259         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 260         if (p->o_arg.seqid == NULL)
 261                 goto err_free;
 262         p->path.mnt = mntget(path->mnt);
 263         p->path.dentry = dget(path->dentry);
 264         p->dir = parent;
 265         p->owner = sp;
 266         atomic_inc(&sp->so_count);
 267         p->o_arg.fh = NFS_FH(dir);
 268         p->o_arg.open_flags = flags,
 269         p->o_arg.clientid = server->nfs_client->cl_clientid;
 270         p->o_arg.id = sp->so_owner_id.id;
 271         p->o_arg.name = &p->path.dentry->d_name;
 272         p->o_arg.server = server;
 273         p->o_arg.bitmask = server->attr_bitmask;
 274         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 275         if (flags & O_EXCL) {
 276                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 277                 s[0] = jiffies;
 278                 s[1] = current->pid;
 279         } else if (flags & O_CREAT) {
 280                 p->o_arg.u.attrs = &p->attrs;
 281                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 282         }
 283         p->c_arg.fh = &p->o_res.fh;
 284         p->c_arg.stateid = &p->o_res.stateid;
 285         p->c_arg.seqid = p->o_arg.seqid;
 286         nfs4_init_opendata_res(p);
 287         kref_init(&p->kref);
 288         return p;
 289 err_free:
 290         kfree(p);
 291 err:
 292         dput(parent);
 293         return NULL;
 294 }
 295
 296 static void nfs4_opendata_free(struct kref *kref)
 297 {
 298         struct nfs4_opendata *p = container_of(kref,
 299                         struct nfs4_opendata, kref);
 300
 301         nfs_free_seqid(p->o_arg.seqid);
 302         if (p->state != NULL)
 303                 nfs4_put_open_state(p->state);
 304         nfs4_put_state_owner(p->owner);
 305         dput(p->dir);
 306         dput(p->path.dentry);
 307         mntput(p->path.mnt);
 308         kfree(p);
 309 }
 310
 311 static void nfs4_opendata_put(struct nfs4_opendata *p)
 312 {
 313         if (p != NULL)
 314                 kref_put(&p->kref, nfs4_opendata_free);
 315 }
 316
 317 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 318 {
 319         sigset_t oldset;
 320         int ret;
 321
 322         rpc_clnt_sigmask(task->tk_client, &oldset);
 323         ret = rpc_wait_for_completion_task(task);
 324         rpc_clnt_sigunmask(task->tk_client, &oldset);
 325         return ret;
 326 }
 327
 328 static int can_open_cached(struct nfs4_state *state, int mode)
 329 {
 330         int ret = 0;
 331         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 332                 case FMODE_READ:
 333                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 337                         break;
 338                 case FMODE_READ|FMODE_WRITE:
 339                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 340         }
 341         return ret;
 342 }
 343
 344 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 345 {
 346         if ((delegation->type & open_flags) != open_flags)
 347                 return 0;
 348         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 349                 return 0;
 350         return 1;
 351 }
 352
 353 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 354 {
 355         switch (open_flags) {
 356                 case FMODE_WRITE:
 357                         state->n_wronly++;
 358                         break;
 359                 case FMODE_READ:
 360                         state->n_rdonly++;
 361                         break;
 362                 case FMODE_READ|FMODE_WRITE:
 363                         state->n_rdwr++;
 364         }
 365         nfs4_state_set_mode_locked(state, state->state | open_flags);
 366 }
 367
 368 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 369 {
 370         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 371                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 372         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 373         switch (open_flags) {
 374                 case FMODE_READ:
 375                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 376                         break;
 377                 case FMODE_WRITE:
 378                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 379                         break;
 380                 case FMODE_READ|FMODE_WRITE:
 381                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 382         }
 383 }
 384
 385 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 386 {
 387         write_seqlock(&state->seqlock);
 388         nfs_set_open_stateid_locked(state, stateid, open_flags);
 389         write_sequnlock(&state->seqlock);
 390 }
 391
 392 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 393 {
 394         open_flags &= (FMODE_READ|FMODE_WRITE);
 395         /*
 396          * Protect the call to nfs4_state_set_mode_locked and
 397          * serialise the stateid update
 398          */
 399         write_seqlock(&state->seqlock);
 400         if (deleg_stateid != NULL) {
 401                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 402                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 403         }
 404         if (open_stateid != NULL)
 405                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 406         write_sequnlock(&state->seqlock);
 407         spin_lock(&state->owner->so_lock);
 408         update_open_stateflags(state, open_flags);
 409         spin_unlock(&state->owner->so_lock);
 410 }
 411
 412 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 413 {
 414         struct nfs_delegation *delegation;
 415
 416         rcu_read_lock();
 417         delegation = rcu_dereference(NFS_I(inode)->delegation);
 418         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 419                 rcu_read_unlock();
 420                 return;
 421         }
 422         rcu_read_unlock();
 423         nfs_inode_return_delegation(inode);
 424 }
 425
 426 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 427 {
 428         struct nfs4_state *state = opendata->state;
 429         struct nfs_inode *nfsi = NFS_I(state->inode);
 430         struct nfs_delegation *delegation;
 431         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 432         nfs4_stateid stateid;
 433         int ret = -EAGAIN;
 434
 435         rcu_read_lock();
 436         delegation = rcu_dereference(nfsi->delegation);
 437         for (;;) {
 438                 if (can_open_cached(state, open_mode)) {
 439                         spin_lock(&state->owner->so_lock);
 440                         if (can_open_cached(state, open_mode)) {
 441                                 update_open_stateflags(state, open_mode);
 442                                 spin_unlock(&state->owner->so_lock);
 443                                 rcu_read_unlock();
 444                                 goto out_return_state;
 445                         }
 446                         spin_unlock(&state->owner->so_lock);
 447                 }
 448                 if (delegation == NULL)
 449                         break;
 450                 if (!can_open_delegated(delegation, open_mode))
 451                         break;
 452                 /* Save the delegation */
 453                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 454                 rcu_read_unlock();
 455                 lock_kernel();
 456                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 457                 unlock_kernel();
 458                 if (ret != 0)
 459                         goto out;
 460                 ret = -EAGAIN;
 461                 rcu_read_lock();
 462                 delegation = rcu_dereference(nfsi->delegation);
 463                 /* If no delegation, try a cached open */
 464                 if (delegation == NULL)
 465                         continue;
 466                 /* Is the delegation still valid? */
 467                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 468                         continue;
 469                 rcu_read_unlock();
 470                 update_open_stateid(state, NULL, &stateid, open_mode);
 471                 goto out_return_state;
 472         }
 473         rcu_read_unlock();
 474 out:
 475         return ERR_PTR(ret);
 476 out_return_state:
 477         atomic_inc(&state->count);
 478         return state;
 479 }
 480
 481 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 482 {
 483         struct inode *inode;
 484         struct nfs4_state *state = NULL;
 485         struct nfs_delegation *delegation;
 486         nfs4_stateid *deleg_stateid = NULL;
 487         int ret;
 488
 489         if (!data->rpc_done) {
 490                 state = nfs4_try_open_cached(data);
 491                 goto out;
 492         }
 493
 494         ret = -EAGAIN;
 495         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 496                 goto err;
 497         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 498         ret = PTR_ERR(inode);
 499         if (IS_ERR(inode))
 500                 goto err;
 501         ret = -ENOMEM;
 502         state = nfs4_get_open_state(inode, data->owner);
 503         if (state == NULL)
 504                 goto err_put_inode;
 505         if (data->o_res.delegation_type != 0) {
 506                 int delegation_flags = 0;
 507
 508                 rcu_read_lock();
 509                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 510                 if (delegation)
 511                         delegation_flags = delegation->flags;
 512                 rcu_read_unlock();
 513                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 514                         nfs_inode_set_delegation(state->inode,
 515                                         data->owner->so_cred,
 516                                         &data->o_res);
 517                 else
 518                         nfs_inode_reclaim_delegation(state->inode,
 519                                         data->owner->so_cred,
 520                                         &data->o_res);
 521         }
 522         rcu_read_lock();
 523         delegation = rcu_dereference(NFS_I(inode)->delegation);
 524         if (delegation != NULL)
 525                 deleg_stateid = &delegation->stateid;
 526         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 527         rcu_read_unlock();
 528         iput(inode);
 529 out:
 530         return state;
 531 err_put_inode:
 532         iput(inode);
 533 err:
 534         return ERR_PTR(ret);
 535 }
 536
 537 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 538 {
 539         struct nfs_inode *nfsi = NFS_I(state->inode);
 540         struct nfs_open_context *ctx;
 541
 542         spin_lock(&state->inode->i_lock);
 543         list_for_each_entry(ctx, &nfsi->open_files, list) {
 544                 if (ctx->state != state)
 545                         continue;
 546                 get_nfs_open_context(ctx);
 547                 spin_unlock(&state->inode->i_lock);
 548                 return ctx;
 549         }
 550         spin_unlock(&state->inode->i_lock);
 551         return ERR_PTR(-ENOENT);
 552 }
 553
 554 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 555 {
 556         struct nfs4_opendata *opendata;
 557
 558         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 559         if (opendata == NULL)
 560                 return ERR_PTR(-ENOMEM);
 561         opendata->state = state;
 562         atomic_inc(&state->count);
 563         return opendata;
 564 }
 565
 566 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 567 {
 568         struct nfs4_state *newstate;
 569         int ret;
 570
 571         opendata->o_arg.open_flags = openflags;
 572         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 573         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 574         nfs4_init_opendata_res(opendata);
 575         ret = _nfs4_proc_open(opendata);
 576         if (ret != 0)
 577                 return ret;
 578         newstate = nfs4_opendata_to_nfs4_state(opendata);
 579         if (IS_ERR(newstate))
 580                 return PTR_ERR(newstate);
 581         nfs4_close_state(&opendata->path, newstate, openflags);
 582         *res = newstate;
 583         return 0;
 584 }
 585
 586 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 587 {
 588         struct nfs4_state *newstate;
 589         int ret;
 590
 591         /* memory barrier prior to reading state->n_* */
 592         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 593         smp_rmb();
 594         if (state->n_rdwr != 0) {
 595                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 596                 if (ret != 0)
 597                         return ret;
 598                 if (newstate != state)
 599                         return -ESTALE;
 600         }
 601         if (state->n_wronly != 0) {
 602                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 603                 if (ret != 0)
 604                         return ret;
 605                 if (newstate != state)
 606                         return -ESTALE;
 607         }
 608         if (state->n_rdonly != 0) {
 609                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 610                 if (ret != 0)
 611                         return ret;
 612                 if (newstate != state)
 613                         return -ESTALE;
 614         }
 615         /*
 616          * We may have performed cached opens for all three recoveries.
 617          * Check if we need to update the current stateid.
 618          */
 619         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 620             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 621                 write_seqlock(&state->seqlock);
 622                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 623                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 624                 write_sequnlock(&state->seqlock);
 625         }
 626         return 0;
 627 }
 628
 629 /*
 630  * OPEN_RECLAIM:
 631  *      reclaim state on the server after a reboot.
 632  */
 633 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 634 {
 635         struct nfs_delegation *delegation;
 636         struct nfs4_opendata *opendata;
 637         int delegation_type = 0;
 638         int status;
 639
 640         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 641         if (IS_ERR(opendata))
 642                 return PTR_ERR(opendata);
 643         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 644         opendata->o_arg.fh = NFS_FH(state->inode);
 645         rcu_read_lock();
 646         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 647         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 648                 delegation_type = delegation->type;
 649         rcu_read_unlock();
 650         opendata->o_arg.u.delegation_type = delegation_type;
 651         status = nfs4_open_recover(opendata, state);
 652         nfs4_opendata_put(opendata);
 653         return status;
 654 }
 655
 656 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 657 {
 658         struct nfs_server *server = NFS_SERVER(state->inode);
 659         struct nfs4_exception exception = { };
 660         int err;
 661         do {
 662                 err = _nfs4_do_open_reclaim(ctx, state);
 663                 if (err != -NFS4ERR_DELAY)
 664                         break;
 665                 nfs4_handle_exception(server, err, &exception);
 666         } while (exception.retry);
 667         return err;
 668 }
 669
 670 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 671 {
 672         struct nfs_open_context *ctx;
 673         int ret;
 674
 675         ctx = nfs4_state_find_open_context(state);
 676         if (IS_ERR(ctx))
 677                 return PTR_ERR(ctx);
 678         ret = nfs4_do_open_reclaim(ctx, state);
 679         put_nfs_open_context(ctx);
 680         return ret;
 681 }
 682
 683 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 684 {
 685         struct nfs4_opendata *opendata;
 686         int ret;
 687
 688         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 689         if (IS_ERR(opendata))
 690                 return PTR_ERR(opendata);
 691         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 692         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 693                         sizeof(opendata->o_arg.u.delegation.data));
 694         ret = nfs4_open_recover(opendata, state);
 695         nfs4_opendata_put(opendata);
 696         return ret;
 697 }
 698
 699 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 700 {
 701         struct nfs4_exception exception = { };
 702         struct nfs_server *server = NFS_SERVER(state->inode);
 703         int err;
 704         do {
 705                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 706                 switch (err) {
 707                         case 0:
 708                                 return err;
 709                         case -NFS4ERR_STALE_CLIENTID:
 710                         case -NFS4ERR_STALE_STATEID:
 711                         case -NFS4ERR_EXPIRED:
 712                                 /* Don't recall a delegation if it was lost */
 713                                 nfs4_schedule_state_recovery(server->nfs_client);
 714                                 return err;
 715                 }
 716                 err = nfs4_handle_exception(server, err, &exception);
 717         } while (exception.retry);
 718         return err;
 719 }
 720
 721 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 722 {
 723         struct nfs4_opendata *data = calldata;
 724         struct  rpc_message msg = {
 725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 726                 .rpc_argp = &data->c_arg,
 727                 .rpc_resp = &data->c_res,
 728                 .rpc_cred = data->owner->so_cred,
 729         };
 730         data->timestamp = jiffies;
 731         rpc_call_setup(task, &msg, 0);
 732 }
 733
 734 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 735 {
 736         struct nfs4_opendata *data = calldata;
 737
 738         data->rpc_status = task->tk_status;
 739         if (RPC_ASSASSINATED(task))
 740                 return;
 741         if (data->rpc_status == 0) {
 742                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 743                                 sizeof(data->o_res.stateid.data));
 744                 renew_lease(data->o_res.server, data->timestamp);
 745                 data->rpc_done = 1;
 746         }
 747         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 748         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 749 }
 750
 751 static void nfs4_open_confirm_release(void *calldata)
 752 {
 753         struct nfs4_opendata *data = calldata;
 754         struct nfs4_state *state = NULL;
 755
 756         /* If this request hasn't been cancelled, do nothing */
 757         if (data->cancelled == 0)
 758                 goto out_free;
 759         /* In case of error, no cleanup! */
 760         if (!data->rpc_done)
 761                 goto out_free;
 762         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 763         state = nfs4_opendata_to_nfs4_state(data);
 764         if (!IS_ERR(state))
 765                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 766 out_free:
 767         nfs4_opendata_put(data);
 768 }
 769
 770 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 771         .rpc_call_prepare = nfs4_open_confirm_prepare,
 772         .rpc_call_done = nfs4_open_confirm_done,
 773         .rpc_release = nfs4_open_confirm_release,
 774 };
 775
 776 /*
 777  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 778  */
 779 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 780 {
 781         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 782         struct rpc_task *task;
 783         int status;
 784
 785         kref_get(&data->kref);
 786         data->rpc_done = 0;
 787         data->rpc_status = 0;
 788         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 789         if (IS_ERR(task))
 790                 return PTR_ERR(task);
 791         status = nfs4_wait_for_completion_rpc_task(task);
 792         if (status != 0) {
 793                 data->cancelled = 1;
 794                 smp_wmb();
 795         } else
 796                 status = data->rpc_status;
 797         rpc_put_task(task);
 798         return status;
 799 }
 800
 801 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 802 {
 803         struct nfs4_opendata *data = calldata;
 804         struct nfs4_state_owner *sp = data->owner;
 805         struct rpc_message msg = {
 806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 807                 .rpc_argp = &data->o_arg,
 808                 .rpc_resp = &data->o_res,
 809                 .rpc_cred = sp->so_cred,
 810         };
 811
 812         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 813                 return;
 814         /*
 815          * Check if we still need to send an OPEN call, or if we can use
 816          * a delegation instead.
 817          */
 818         if (data->state != NULL) {
 819                 struct nfs_delegation *delegation;
 820
 821                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 822                         goto out_no_action;
 823                 rcu_read_lock();
 824                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 825                 if (delegation != NULL &&
 826                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 827                         rcu_read_unlock();
 828                         goto out_no_action;
 829                 }
 830                 rcu_read_unlock();
 831         }
 832         /* Update sequence id. */
 833         data->o_arg.id = sp->so_owner_id.id;
 834         data->o_arg.clientid = sp->so_client->cl_clientid;
 835         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 836                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 837                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 838         }
 839         data->timestamp = jiffies;
 840         rpc_call_setup(task, &msg, 0);
 841         return;
 842 out_no_action:
 843         task->tk_action = NULL;
 844
 845 }
 846
 847 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 848 {
 849         struct nfs4_opendata *data = calldata;
 850
 851         data->rpc_status = task->tk_status;
 852         if (RPC_ASSASSINATED(task))
 853                 return;
 854         if (task->tk_status == 0) {
 855                 switch (data->o_res.f_attr->mode & S_IFMT) {
 856                         case S_IFREG:
 857                                 break;
 858                         case S_IFLNK:
 859                                 data->rpc_status = -ELOOP;
 860                                 break;
 861                         case S_IFDIR:
 862                                 data->rpc_status = -EISDIR;
 863                                 break;
 864                         default:
 865                                 data->rpc_status = -ENOTDIR;
 866                 }
 867                 renew_lease(data->o_res.server, data->timestamp);
 868                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 869                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 870         }
 871         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 872         data->rpc_done = 1;
 873 }
 874
 875 static void nfs4_open_release(void *calldata)
 876 {
 877         struct nfs4_opendata *data = calldata;
 878         struct nfs4_state *state = NULL;
 879
 880         /* If this request hasn't been cancelled, do nothing */
 881         if (data->cancelled == 0)
 882                 goto out_free;
 883         /* In case of error, no cleanup! */
 884         if (data->rpc_status != 0 || !data->rpc_done)
 885                 goto out_free;
 886         /* In case we need an open_confirm, no cleanup! */
 887         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 888                 goto out_free;
 889         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 890         state = nfs4_opendata_to_nfs4_state(data);
 891         if (!IS_ERR(state))
 892                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 893 out_free:
 894         nfs4_opendata_put(data);
 895 }
 896
 897 static const struct rpc_call_ops nfs4_open_ops = {
 898         .rpc_call_prepare = nfs4_open_prepare,
 899         .rpc_call_done = nfs4_open_done,
 900         .rpc_release = nfs4_open_release,
 901 };
 902
 903 /*
 904  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 905  */
 906 static int _nfs4_proc_open(struct nfs4_opendata *data)
 907 {
 908         struct inode *dir = data->dir->d_inode;
 909         struct nfs_server *server = NFS_SERVER(dir);
 910         struct nfs_openargs *o_arg = &data->o_arg;
 911         struct nfs_openres *o_res = &data->o_res;
 912         struct rpc_task *task;
 913         int status;
 914
 915         kref_get(&data->kref);
 916         data->rpc_done = 0;
 917         data->rpc_status = 0;
 918         data->cancelled = 0;
 919         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 920         if (IS_ERR(task))
 921                 return PTR_ERR(task);
 922         status = nfs4_wait_for_completion_rpc_task(task);
 923         if (status != 0) {
 924                 data->cancelled = 1;
 925                 smp_wmb();
 926         } else
 927                 status = data->rpc_status;
 928         rpc_put_task(task);
 929         if (status != 0 || !data->rpc_done)
 930                 return status;
 931
 932         if (o_res->fh.size == 0)
 933                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 934
 935         if (o_arg->open_flags & O_CREAT) {
 936                 update_changeattr(dir, &o_res->cinfo);
 937                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 938         } else
 939                 nfs_refresh_inode(dir, o_res->dir_attr);
 940         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 941                 status = _nfs4_proc_open_confirm(data);
 942                 if (status != 0)
 943                         return status;
 944         }
 945         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 946                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 947         return 0;
 948 }
 949
 950 static int nfs4_recover_expired_lease(struct nfs_server *server)
 951 {
 952         struct nfs_client *clp = server->nfs_client;
 953         int ret;
 954
 955         for (;;) {
 956                 ret = nfs4_wait_clnt_recover(server->client, clp);
 957                 if (ret != 0)
 958                         return ret;
 959                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 960                         break;
 961                 nfs4_schedule_state_recovery(clp);
 962         }
 963         return 0;
 964 }
 965
 966 /*
 967  * OPEN_EXPIRED:
 968  *      reclaim state on the server after a network partition.
 969  *      Assumes caller holds the appropriate lock
 970  */
 971 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 972 {
 973         struct nfs4_opendata *opendata;
 974         int ret;
 975
 976         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 977         if (IS_ERR(opendata))
 978                 return PTR_ERR(opendata);
 979         ret = nfs4_open_recover(opendata, state);
 980         if (ret == -ESTALE) {
 981                 /* Invalidate the state owner so we don't ever use it again */
 982                 nfs4_drop_state_owner(state->owner);
 983                 d_drop(ctx->path.dentry);
 984         }
 985         nfs4_opendata_put(opendata);
 986         return ret;
 987 }
 988
 989 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 990 {
 991         struct nfs_server *server = NFS_SERVER(state->inode);
 992         struct nfs4_exception exception = { };
 993         int err;
 994
 995         do {
 996                 err = _nfs4_open_expired(ctx, state);
 997                 if (err == -NFS4ERR_DELAY)
 998                         nfs4_handle_exception(server, err, &exception);
 999         } while (exception.retry);
1000         return err;
1001 }
1002
1003 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1004 {
1005         struct nfs_open_context *ctx;
1006         int ret;
1007
1008         ctx = nfs4_state_find_open_context(state);
1009         if (IS_ERR(ctx))
1010                 return PTR_ERR(ctx);
1011         ret = nfs4_do_open_expired(ctx, state);
1012         put_nfs_open_context(ctx);
1013         return ret;
1014 }
1015
1016 /*
1017  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1018  * fields corresponding to attributes that were used to store the verifier.
1019  * Make sure we clobber those fields in the later setattr call
1020  */
1021 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1022 {
1023         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1024             !(sattr->ia_valid & ATTR_ATIME_SET))
1025                 sattr->ia_valid |= ATTR_ATIME;
1026
1027         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1028             !(sattr->ia_valid & ATTR_MTIME_SET))
1029                 sattr->ia_valid |= ATTR_MTIME;
1030 }
1031
1032 /*
1033  * Returns a referenced nfs4_state
1034  */
1035 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1036 {
1037         struct nfs4_state_owner  *sp;
1038         struct nfs4_state     *state = NULL;
1039         struct nfs_server       *server = NFS_SERVER(dir);
1040         struct nfs_client *clp = server->nfs_client;
1041         struct nfs4_opendata *opendata;
1042         int status;
1043
1044         /* Protect against reboot recovery conflicts */
1045         status = -ENOMEM;
1046         if (!(sp = nfs4_get_state_owner(server, cred))) {
1047                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1048                 goto out_err;
1049         }
1050         status = nfs4_recover_expired_lease(server);
1051         if (status != 0)
1052                 goto err_put_state_owner;
1053         if (path->dentry->d_inode != NULL)
1054                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1055         down_read(&clp->cl_sem);
1056         status = -ENOMEM;
1057         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1058         if (opendata == NULL)
1059                 goto err_release_rwsem;
1060
1061         if (path->dentry->d_inode != NULL)
1062                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1063
1064         status = _nfs4_proc_open(opendata);
1065         if (status != 0)
1066                 goto err_opendata_put;
1067
1068         if (opendata->o_arg.open_flags & O_EXCL)
1069                 nfs4_exclusive_attrset(opendata, sattr);
1070
1071         state = nfs4_opendata_to_nfs4_state(opendata);
1072         status = PTR_ERR(state);
1073         if (IS_ERR(state))
1074                 goto err_opendata_put;
1075         nfs4_opendata_put(opendata);
1076         nfs4_put_state_owner(sp);
1077         up_read(&clp->cl_sem);
1078         *res = state;
1079         return 0;
1080 err_opendata_put:
1081         nfs4_opendata_put(opendata);
1082 err_release_rwsem:
1083         up_read(&clp->cl_sem);
1084 err_put_state_owner:
1085         nfs4_put_state_owner(sp);
1086 out_err:
1087         *res = NULL;
1088         return status;
1089 }
1090
1091
1092 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1093 {
1094         struct nfs4_exception exception = { };
1095         struct nfs4_state *res;
1096         int status;
1097
1098         do {
1099                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1100                 if (status == 0)
1101                         break;
1102                 /* NOTE: BAD_SEQID means the server and client disagree about the
1103                  * book-keeping w.r.t. state-changing operations
1104                  * (OPEN/CLOSE/LOCK/LOCKU...)
1105                  * It is actually a sign of a bug on the client or on the server.
1106                  *
1107                  * If we receive a BAD_SEQID error in the particular case of
1108                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1109                  * have unhashed the old state_owner for us, and that we can
1110                  * therefore safely retry using a new one. We should still warn
1111                  * the user though...
1112                  */
1113                 if (status == -NFS4ERR_BAD_SEQID) {
1114                         printk(KERN_WARNING "NFS: v4 server %s "
1115                                         " returned a bad sequence-id error!\n",
1116                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1117                         exception.retry = 1;
1118                         continue;
1119                 }
1120                 /*
1121                  * BAD_STATEID on OPEN means that the server cancelled our
1122                  * state before it received the OPEN_CONFIRM.
1123                  * Recover by retrying the request as per the discussion
1124                  * on Page 181 of RFC3530.
1125                  */
1126                 if (status == -NFS4ERR_BAD_STATEID) {
1127                         exception.retry = 1;
1128                         continue;
1129                 }
1130                 if (status == -EAGAIN) {
1131                         /* We must have found a delegation */
1132                         exception.retry = 1;
1133                         continue;
1134                 }
1135                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1136                                         status, &exception));
1137         } while (exception.retry);
1138         return res;
1139 }
1140
1141 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1142                 struct iattr *sattr, struct nfs4_state *state)
1143 {
1144         struct nfs_server *server = NFS_SERVER(inode);
1145         struct nfs_setattrargs  arg = {
1146                 .fh             = NFS_FH(inode),
1147                 .iap            = sattr,
1148                 .server         = server,
1149                 .bitmask = server->attr_bitmask,
1150         };
1151         struct nfs_setattrres  res = {
1152                 .fattr          = fattr,
1153                 .server         = server,
1154         };
1155         struct rpc_message msg = {
1156                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1157                 .rpc_argp       = &arg,
1158                 .rpc_resp       = &res,
1159         };
1160         unsigned long timestamp = jiffies;
1161         int status;
1162
1163         nfs_fattr_init(fattr);
1164
1165         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1166                 /* Use that stateid */
1167         } else if (state != NULL) {
1168                 msg.rpc_cred = state->owner->so_cred;
1169                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1170         } else
1171                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1172
1173         status = rpc_call_sync(server->client, &msg, 0);
1174         if (status == 0 && state != NULL)
1175                 renew_lease(server, timestamp);
1176         return status;
1177 }
1178
1179 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1180                 struct iattr *sattr, struct nfs4_state *state)
1181 {
1182         struct nfs_server *server = NFS_SERVER(inode);
1183         struct nfs4_exception exception = { };
1184         int err;
1185         do {
1186                 err = nfs4_handle_exception(server,
1187                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1188                                 &exception);
1189         } while (exception.retry);
1190         return err;
1191 }
1192
1193 struct nfs4_closedata {
1194         struct path path;
1195         struct inode *inode;
1196         struct nfs4_state *state;
1197         struct nfs_closeargs arg;
1198         struct nfs_closeres res;
1199         struct nfs_fattr fattr;
1200         unsigned long timestamp;
1201 };
1202
1203 static void nfs4_free_closedata(void *data)
1204 {
1205         struct nfs4_closedata *calldata = data;
1206         struct nfs4_state_owner *sp = calldata->state->owner;
1207
1208         nfs4_put_open_state(calldata->state);
1209         nfs_free_seqid(calldata->arg.seqid);
1210         nfs4_put_state_owner(sp);
1211         dput(calldata->path.dentry);
1212         mntput(calldata->path.mnt);
1213         kfree(calldata);
1214 }
1215
1216 static void nfs4_close_done(struct rpc_task *task, void *data)
1217 {
1218         struct nfs4_closedata *calldata = data;
1219         struct nfs4_state *state = calldata->state;
1220         struct nfs_server *server = NFS_SERVER(calldata->inode);
1221
1222         if (RPC_ASSASSINATED(task))
1223                 return;
1224         /* hmm. we are done with the inode, and in the process of freeing
1225          * the state_owner. we keep this around to process errors
1226          */
1227         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1228         switch (task->tk_status) {
1229                 case 0:
1230                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1231                         renew_lease(server, calldata->timestamp);
1232                         break;
1233                 case -NFS4ERR_STALE_STATEID:
1234                 case -NFS4ERR_EXPIRED:
1235                         break;
1236                 default:
1237                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1238                                 rpc_restart_call(task);
1239                                 return;
1240                         }
1241         }
1242         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1243 }
1244
1245 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1246 {
1247         struct nfs4_closedata *calldata = data;
1248         struct nfs4_state *state = calldata->state;
1249         struct rpc_message msg = {
1250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1251                 .rpc_argp = &calldata->arg,
1252                 .rpc_resp = &calldata->res,
1253                 .rpc_cred = state->owner->so_cred,
1254         };
1255         int clear_rd, clear_wr, clear_rdwr;
1256
1257         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1258                 return;
1259
1260         clear_rd = clear_wr = clear_rdwr = 0;
1261         spin_lock(&state->owner->so_lock);
1262         /* Calculate the change in open mode */
1263         if (state->n_rdwr == 0) {
1264                 if (state->n_rdonly == 0) {
1265                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1266                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1267                 }
1268                 if (state->n_wronly == 0) {
1269                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1270                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1271                 }
1272         }
1273         spin_unlock(&state->owner->so_lock);
1274         if (!clear_rd && !clear_wr && !clear_rdwr) {
1275                 /* Note: exit _without_ calling nfs4_close_done */
1276                 task->tk_action = NULL;
1277                 return;
1278         }
1279         nfs_fattr_init(calldata->res.fattr);
1280         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1281                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1282                 calldata->arg.open_flags = FMODE_READ;
1283         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1284                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1285                 calldata->arg.open_flags = FMODE_WRITE;
1286         }
1287         calldata->timestamp = jiffies;
1288         rpc_call_setup(task, &msg, 0);
1289 }
1290
1291 static const struct rpc_call_ops nfs4_close_ops = {
1292         .rpc_call_prepare = nfs4_close_prepare,
1293         .rpc_call_done = nfs4_close_done,
1294         .rpc_release = nfs4_free_closedata,
1295 };
1296
1297 /*
1298  * It is possible for data to be read/written from a mem-mapped file
1299  * after the sys_close call (which hits the vfs layer as a flush).
1300  * This means that we can't safely call nfsv4 close on a file until
1301  * the inode is cleared. This in turn means that we are not good
1302  * NFSv4 citizens - we do not indicate to the server to update the file's
1303  * share state even when we are done with one of the three share
1304  * stateid's in the inode.
1305  *
1306  * NOTE: Caller must be holding the sp->so_owner semaphore!
1307  */
1308 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1309 {
1310         struct nfs_server *server = NFS_SERVER(state->inode);
1311         struct nfs4_closedata *calldata;
1312         struct nfs4_state_owner *sp = state->owner;
1313         struct rpc_task *task;
1314         int status = -ENOMEM;
1315
1316         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1317         if (calldata == NULL)
1318                 goto out;
1319         calldata->inode = state->inode;
1320         calldata->state = state;
1321         calldata->arg.fh = NFS_FH(state->inode);
1322         calldata->arg.stateid = &state->open_stateid;
1323         /* Serialization for the sequence id */
1324         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1325         if (calldata->arg.seqid == NULL)
1326                 goto out_free_calldata;
1327         calldata->arg.bitmask = server->attr_bitmask;
1328         calldata->res.fattr = &calldata->fattr;
1329         calldata->res.server = server;
1330         calldata->path.mnt = mntget(path->mnt);
1331         calldata->path.dentry = dget(path->dentry);
1332
1333         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1334         if (IS_ERR(task))
1335                 return PTR_ERR(task);
1336         rpc_put_task(task);
1337         return 0;
1338 out_free_calldata:
1339         kfree(calldata);
1340 out:
1341         nfs4_put_open_state(state);
1342         nfs4_put_state_owner(sp);
1343         return status;
1344 }
1345
1346 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1347 {
1348         struct file *filp;
1349         int ret;
1350
1351         /* If the open_intent is for execute, we have an extra check to make */
1352         if (nd->intent.open.flags & FMODE_EXEC) {
1353                 ret = nfs_may_open(state->inode,
1354                                 state->owner->so_cred,
1355                                 nd->intent.open.flags);
1356                 if (ret < 0)
1357                         goto out_close;
1358         }
1359         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1360         if (!IS_ERR(filp)) {
1361                 struct nfs_open_context *ctx;
1362                 ctx = nfs_file_open_context(filp);
1363                 ctx->state = state;
1364                 return 0;
1365         }
1366         ret = PTR_ERR(filp);
1367 out_close:
1368         nfs4_close_state(path, state, nd->intent.open.flags);
1369         return ret;
1370 }
1371
1372 struct dentry *
1373 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1374 {
1375         struct path path = {
1376                 .mnt = nd->mnt,
1377                 .dentry = dentry,
1378         };
1379         struct iattr attr;
1380         struct rpc_cred *cred;
1381         struct nfs4_state *state;
1382         struct dentry *res;
1383
1384         if (nd->flags & LOOKUP_CREATE) {
1385                 attr.ia_mode = nd->intent.open.create_mode;
1386                 attr.ia_valid = ATTR_MODE;
1387                 if (!IS_POSIXACL(dir))
1388                         attr.ia_mode &= ~current->fs->umask;
1389         } else {
1390                 attr.ia_valid = 0;
1391                 BUG_ON(nd->intent.open.flags & O_CREAT);
1392         }
1393
1394         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1395         if (IS_ERR(cred))
1396                 return (struct dentry *)cred;
1397         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1398         put_rpccred(cred);
1399         if (IS_ERR(state)) {
1400                 if (PTR_ERR(state) == -ENOENT)
1401                         d_add(dentry, NULL);
1402                 return (struct dentry *)state;
1403         }
1404         res = d_add_unique(dentry, igrab(state->inode));
1405         if (res != NULL)
1406                 path.dentry = res;
1407         nfs4_intent_set_file(nd, &path, state);
1408         return res;
1409 }
1410
1411 int
1412 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1413 {
1414         struct path path = {
1415                 .mnt = nd->mnt,
1416                 .dentry = dentry,
1417         };
1418         struct rpc_cred *cred;
1419         struct nfs4_state *state;
1420
1421         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1422         if (IS_ERR(cred))
1423                 return PTR_ERR(cred);
1424         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1425         put_rpccred(cred);
1426         if (IS_ERR(state)) {
1427                 switch (PTR_ERR(state)) {
1428                         case -EPERM:
1429                         case -EACCES:
1430                         case -EDQUOT:
1431                         case -ENOSPC:
1432                         case -EROFS:
1433                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1434                                 return 1;
1435                         default:
1436                                 goto out_drop;
1437                 }
1438         }
1439         if (state->inode == dentry->d_inode) {
1440                 nfs4_intent_set_file(nd, &path, state);
1441                 return 1;
1442         }
1443         nfs4_close_state(&path, state, openflags);
1444 out_drop:
1445         d_drop(dentry);
1446         return 0;
1447 }
1448
1449
1450 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1451 {
1452         struct nfs4_server_caps_res res = {};
1453         struct rpc_message msg = {
1454                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1455                 .rpc_argp = fhandle,
1456                 .rpc_resp = &res,
1457         };
1458         int status;
1459
1460         status = rpc_call_sync(server->client, &msg, 0);
1461         if (status == 0) {
1462                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1463                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1464                         server->caps |= NFS_CAP_ACLS;
1465                 if (res.has_links != 0)
1466                         server->caps |= NFS_CAP_HARDLINKS;
1467                 if (res.has_symlinks != 0)
1468                         server->caps |= NFS_CAP_SYMLINKS;
1469                 server->acl_bitmask = res.acl_bitmask;
1470         }
1471         return status;
1472 }
1473
1474 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1475 {
1476         struct nfs4_exception exception = { };
1477         int err;
1478         do {
1479                 err = nfs4_handle_exception(server,
1480                                 _nfs4_server_capabilities(server, fhandle),
1481                                 &exception);
1482         } while (exception.retry);
1483         return err;
1484 }
1485
1486 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1487                 struct nfs_fsinfo *info)
1488 {
1489         struct nfs4_lookup_root_arg args = {
1490                 .bitmask = nfs4_fattr_bitmap,
1491         };
1492         struct nfs4_lookup_res res = {
1493                 .server = server,
1494                 .fattr = info->fattr,
1495                 .fh = fhandle,
1496         };
1497         struct rpc_message msg = {
1498                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1499                 .rpc_argp = &args,
1500                 .rpc_resp = &res,
1501         };
1502         nfs_fattr_init(info->fattr);
1503         return rpc_call_sync(server->client, &msg, 0);
1504 }
1505
1506 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1507                 struct nfs_fsinfo *info)
1508 {
1509         struct nfs4_exception exception = { };
1510         int err;
1511         do {
1512                 err = nfs4_handle_exception(server,
1513                                 _nfs4_lookup_root(server, fhandle, info),
1514                                 &exception);
1515         } while (exception.retry);
1516         return err;
1517 }
1518
1519 /*
1520  * get the file handle for the "/" directory on the server
1521  */
1522 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1523                               struct nfs_fsinfo *info)
1524 {
1525         int status;
1526
1527         status = nfs4_lookup_root(server, fhandle, info);
1528         if (status == 0)
1529                 status = nfs4_server_capabilities(server, fhandle);
1530         if (status == 0)
1531                 status = nfs4_do_fsinfo(server, fhandle, info);
1532         return nfs4_map_errors(status);
1533 }
1534
1535 /*
1536  * Get locations and (maybe) other attributes of a referral.
1537  * Note that we'll actually follow the referral later when
1538  * we detect fsid mismatch in inode revalidation
1539  */
1540 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1541 {
1542         int status = -ENOMEM;
1543         struct page *page = NULL;
1544         struct nfs4_fs_locations *locations = NULL;
1545
1546         page = alloc_page(GFP_KERNEL);
1547         if (page == NULL)
1548                 goto out;
1549         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1550         if (locations == NULL)
1551                 goto out;
1552
1553         status = nfs4_proc_fs_locations(dir, name, locations, page);
1554         if (status != 0)
1555                 goto out;
1556         /* Make sure server returned a different fsid for the referral */
1557         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1558                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1559                 status = -EIO;
1560                 goto out;
1561         }
1562
1563         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1564         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1565         if (!fattr->mode)
1566                 fattr->mode = S_IFDIR;
1567         memset(fhandle, 0, sizeof(struct nfs_fh));
1568 out:
1569         if (page)
1570                 __free_page(page);
1571         if (locations)
1572                 kfree(locations);
1573         return status;
1574 }
1575
1576 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1577 {
1578         struct nfs4_getattr_arg args = {
1579                 .fh = fhandle,
1580                 .bitmask = server->attr_bitmask,
1581         };
1582         struct nfs4_getattr_res res = {
1583                 .fattr = fattr,
1584                 .server = server,
1585         };
1586         struct rpc_message msg = {
1587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1588                 .rpc_argp = &args,
1589                 .rpc_resp = &res,
1590         };
1591
1592         nfs_fattr_init(fattr);
1593         return rpc_call_sync(server->client, &msg, 0);
1594 }
1595
1596 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1597 {
1598         struct nfs4_exception exception = { };
1599         int err;
1600         do {
1601                 err = nfs4_handle_exception(server,
1602                                 _nfs4_proc_getattr(server, fhandle, fattr),
1603                                 &exception);
1604         } while (exception.retry);
1605         return err;
1606 }
1607
1608 /*
1609  * The file is not closed if it is opened due to the a request to change
1610  * the size of the file. The open call will not be needed once the
1611  * VFS layer lookup-intents are implemented.
1612  *
1613  * Close is called when the inode is destroyed.
1614  * If we haven't opened the file for O_WRONLY, we
1615  * need to in the size_change case to obtain a stateid.
1616  *
1617  * Got race?
1618  * Because OPEN is always done by name in nfsv4, it is
1619  * possible that we opened a different file by the same
1620  * name.  We can recognize this race condition, but we
1621  * can't do anything about it besides returning an error.
1622  *
1623  * This will be fixed with VFS changes (lookup-intent).
1624  */
1625 static int
1626 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1627                   struct iattr *sattr)
1628 {
1629         struct rpc_cred *cred;
1630         struct inode *inode = dentry->d_inode;
1631         struct nfs_open_context *ctx;
1632         struct nfs4_state *state = NULL;
1633         int status;
1634
1635         nfs_fattr_init(fattr);
1636
1637         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1638         if (IS_ERR(cred))
1639                 return PTR_ERR(cred);
1640
1641         /* Search for an existing open(O_WRITE) file */
1642         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1643         if (ctx != NULL)
1644                 state = ctx->state;
1645
1646         status = nfs4_do_setattr(inode, fattr, sattr, state);
1647         if (status == 0)
1648                 nfs_setattr_update_inode(inode, sattr);
1649         if (ctx != NULL)
1650                 put_nfs_open_context(ctx);
1651         put_rpccred(cred);
1652         return status;
1653 }
1654
1655 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1656                 const struct qstr *name, struct nfs_fh *fhandle,
1657                 struct nfs_fattr *fattr)
1658 {
1659         int                    status;
1660         struct nfs4_lookup_arg args = {
1661                 .bitmask = server->attr_bitmask,
1662                 .dir_fh = dirfh,
1663                 .name = name,
1664         };
1665         struct nfs4_lookup_res res = {
1666                 .server = server,
1667                 .fattr = fattr,
1668                 .fh = fhandle,
1669         };
1670         struct rpc_message msg = {
1671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1672                 .rpc_argp = &args,
1673                 .rpc_resp = &res,
1674         };
1675
1676         nfs_fattr_init(fattr);
1677
1678         dprintk("NFS call  lookupfh %s\n", name->name);
1679         status = rpc_call_sync(server->client, &msg, 0);
1680         dprintk("NFS reply lookupfh: %d\n", status);
1681         return status;
1682 }
1683
1684 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1685                               struct qstr *name, struct nfs_fh *fhandle,
1686                               struct nfs_fattr *fattr)
1687 {
1688         struct nfs4_exception exception = { };
1689         int err;
1690         do {
1691                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1692                 /* FIXME: !!!! */
1693                 if (err == -NFS4ERR_MOVED) {
1694                         err = -EREMOTE;
1695                         break;
1696                 }
1697                 err = nfs4_handle_exception(server, err, &exception);
1698         } while (exception.retry);
1699         return err;
1700 }
1701
1702 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1703                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1704 {
1705         int status;
1706
1707         dprintk("NFS call  lookup %s\n", name->name);
1708         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1709         if (status == -NFS4ERR_MOVED)
1710                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1711         dprintk("NFS reply lookup: %d\n", status);
1712         return status;
1713 }
1714
1715 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1716 {
1717         struct nfs4_exception exception = { };
1718         int err;
1719         do {
1720                 err = nfs4_handle_exception(NFS_SERVER(dir),
1721                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1722                                 &exception);
1723         } while (exception.retry);
1724         return err;
1725 }
1726
1727 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1728 {
1729         struct nfs4_accessargs args = {
1730                 .fh = NFS_FH(inode),
1731         };
1732         struct nfs4_accessres res = { 0 };
1733         struct rpc_message msg = {
1734                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1735                 .rpc_argp = &args,
1736                 .rpc_resp = &res,
1737                 .rpc_cred = entry->cred,
1738         };
1739         int mode = entry->mask;
1740         int status;
1741
1742         /*
1743          * Determine which access bits we want to ask for...
1744          */
1745         if (mode & MAY_READ)
1746                 args.access |= NFS4_ACCESS_READ;
1747         if (S_ISDIR(inode->i_mode)) {
1748                 if (mode & MAY_WRITE)
1749                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1750                 if (mode & MAY_EXEC)
1751                         args.access |= NFS4_ACCESS_LOOKUP;
1752         } else {
1753                 if (mode & MAY_WRITE)
1754                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1755                 if (mode & MAY_EXEC)
1756                         args.access |= NFS4_ACCESS_EXECUTE;
1757         }
1758         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1759         if (!status) {
1760                 entry->mask = 0;
1761                 if (res.access & NFS4_ACCESS_READ)
1762                         entry->mask |= MAY_READ;
1763                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1764                         entry->mask |= MAY_WRITE;
1765                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1766                         entry->mask |= MAY_EXEC;
1767         }
1768         return status;
1769 }
1770
1771 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1772 {
1773         struct nfs4_exception exception = { };
1774         int err;
1775         do {
1776                 err = nfs4_handle_exception(NFS_SERVER(inode),
1777                                 _nfs4_proc_access(inode, entry),
1778                                 &exception);
1779         } while (exception.retry);
1780         return err;
1781 }
1782
1783 /*
1784  * TODO: For the time being, we don't try to get any attributes
1785  * along with any of the zero-copy operations READ, READDIR,
1786  * READLINK, WRITE.
1787  *
1788  * In the case of the first three, we want to put the GETATTR
1789  * after the read-type operation -- this is because it is hard
1790  * to predict the length of a GETATTR response in v4, and thus
1791  * align the READ data correctly.  This means that the GETATTR
1792  * may end up partially falling into the page cache, and we should
1793  * shift it into the 'tail' of the xdr_buf before processing.
1794  * To do this efficiently, we need to know the total length
1795  * of data received, which doesn't seem to be available outside
1796  * of the RPC layer.
1797  *
1798  * In the case of WRITE, we also want to put the GETATTR after
1799  * the operation -- in this case because we want to make sure
1800  * we get the post-operation mtime and size.  This means that
1801  * we can't use xdr_encode_pages() as written: we need a variant
1802  * of it which would leave room in the 'tail' iovec.
1803  *
1804  * Both of these changes to the XDR layer would in fact be quite
1805  * minor, but I decided to leave them for a subsequent patch.
1806  */
1807 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1808                 unsigned int pgbase, unsigned int pglen)
1809 {
1810         struct nfs4_readlink args = {
1811                 .fh       = NFS_FH(inode),
1812                 .pgbase   = pgbase,
1813                 .pglen    = pglen,
1814                 .pages    = &page,
1815         };
1816         struct rpc_message msg = {
1817                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1818                 .rpc_argp = &args,
1819                 .rpc_resp = NULL,
1820         };
1821
1822         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1823 }
1824
1825 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1826                 unsigned int pgbase, unsigned int pglen)
1827 {
1828         struct nfs4_exception exception = { };
1829         int err;
1830         do {
1831                 err = nfs4_handle_exception(NFS_SERVER(inode),
1832                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1833                                 &exception);
1834         } while (exception.retry);
1835         return err;
1836 }
1837
1838 /*
1839  * Got race?
1840  * We will need to arrange for the VFS layer to provide an atomic open.
1841  * Until then, this create/open method is prone to inefficiency and race
1842  * conditions due to the lookup, create, and open VFS calls from sys_open()
1843  * placed on the wire.
1844  *
1845  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1846  * The file will be opened again in the subsequent VFS open call
1847  * (nfs4_proc_file_open).
1848  *
1849  * The open for read will just hang around to be used by any process that
1850  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1851  */
1852
1853 static int
1854 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1855                  int flags, struct nameidata *nd)
1856 {
1857         struct path path = {
1858                 .mnt = nd->mnt,
1859                 .dentry = dentry,
1860         };
1861         struct nfs4_state *state;
1862         struct rpc_cred *cred;
1863         int status = 0;
1864
1865         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1866         if (IS_ERR(cred)) {
1867                 status = PTR_ERR(cred);
1868                 goto out;
1869         }
1870         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1871         put_rpccred(cred);
1872         if (IS_ERR(state)) {
1873                 status = PTR_ERR(state);
1874                 goto out;
1875         }
1876         d_instantiate(dentry, igrab(state->inode));
1877         if (flags & O_EXCL) {
1878                 struct nfs_fattr fattr;
1879                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1880                 if (status == 0)
1881                         nfs_setattr_update_inode(state->inode, sattr);
1882                 nfs_post_op_update_inode(state->inode, &fattr);
1883         }
1884         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1885                 status = nfs4_intent_set_file(nd, &path, state);
1886         else
1887                 nfs4_close_state(&path, state, flags);
1888 out:
1889         return status;
1890 }
1891
1892 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1893 {
1894         struct nfs_server *server = NFS_SERVER(dir);
1895         struct nfs_removeargs args = {
1896                 .fh = NFS_FH(dir),
1897                 .name.len = name->len,
1898                 .name.name = name->name,
1899                 .bitmask = server->attr_bitmask,
1900         };
1901         struct nfs_removeres res = {
1902                 .server = server,
1903         };
1904         struct rpc_message msg = {
1905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1906                 .rpc_argp = &args,
1907                 .rpc_resp = &res,
1908         };
1909         int                     status;
1910
1911         nfs_fattr_init(&res.dir_attr);
1912         status = rpc_call_sync(server->client, &msg, 0);
1913         if (status == 0) {
1914                 update_changeattr(dir, &res.cinfo);
1915                 nfs_post_op_update_inode(dir, &res.dir_attr);
1916         }
1917         return status;
1918 }
1919
1920 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1921 {
1922         struct nfs4_exception exception = { };
1923         int err;
1924         do {
1925                 err = nfs4_handle_exception(NFS_SERVER(dir),
1926                                 _nfs4_proc_remove(dir, name),
1927                                 &exception);
1928         } while (exception.retry);
1929         return err;
1930 }
1931
1932 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1933 {
1934         struct nfs_server *server = NFS_SERVER(dir);
1935         struct nfs_removeargs *args = msg->rpc_argp;
1936         struct nfs_removeres *res = msg->rpc_resp;
1937
1938         args->bitmask = server->attr_bitmask;
1939         res->server = server;
1940         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1941 }
1942
1943 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1944 {
1945         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1946
1947         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1948                 return 0;
1949         update_changeattr(dir, &res->cinfo);
1950         nfs_post_op_update_inode(dir, &res->dir_attr);
1951         return 1;
1952 }
1953
1954 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1955                 struct inode *new_dir, struct qstr *new_name)
1956 {
1957         struct nfs_server *server = NFS_SERVER(old_dir);
1958         struct nfs4_rename_arg arg = {
1959                 .old_dir = NFS_FH(old_dir),
1960                 .new_dir = NFS_FH(new_dir),
1961                 .old_name = old_name,
1962                 .new_name = new_name,
1963                 .bitmask = server->attr_bitmask,
1964         };
1965         struct nfs_fattr old_fattr, new_fattr;
1966         struct nfs4_rename_res res = {
1967                 .server = server,
1968                 .old_fattr = &old_fattr,
1969                 .new_fattr = &new_fattr,
1970         };
1971         struct rpc_message msg = {
1972                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1973                 .rpc_argp = &arg,
1974                 .rpc_resp = &res,
1975         };
1976         int                     status;
1977
1978         nfs_fattr_init(res.old_fattr);
1979         nfs_fattr_init(res.new_fattr);
1980         status = rpc_call_sync(server->client, &msg, 0);
1981
1982         if (!status) {
1983                 update_changeattr(old_dir, &res.old_cinfo);
1984                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1985                 update_changeattr(new_dir, &res.new_cinfo);
1986                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1987         }
1988         return status;
1989 }
1990
1991 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1992                 struct inode *new_dir, struct qstr *new_name)
1993 {
1994         struct nfs4_exception exception = { };
1995         int err;
1996         do {
1997                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1998                                 _nfs4_proc_rename(old_dir, old_name,
1999                                         new_dir, new_name),
2000                                 &exception);
2001         } while (exception.retry);
2002         return err;
2003 }
2004
2005 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2006 {
2007         struct nfs_server *server = NFS_SERVER(inode);
2008         struct nfs4_link_arg arg = {
2009                 .fh     = NFS_FH(inode),
2010                 .dir_fh = NFS_FH(dir),
2011                 .name   = name,
2012                 .bitmask = server->attr_bitmask,
2013         };
2014         struct nfs_fattr fattr, dir_attr;
2015         struct nfs4_link_res res = {
2016                 .server = server,
2017                 .fattr = &fattr,
2018                 .dir_attr = &dir_attr,
2019         };
2020         struct rpc_message msg = {
2021                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2022                 .rpc_argp = &arg,
2023                 .rpc_resp = &res,
2024         };
2025         int                     status;
2026
2027         nfs_fattr_init(res.fattr);
2028         nfs_fattr_init(res.dir_attr);
2029         status = rpc_call_sync(server->client, &msg, 0);
2030         if (!status) {
2031                 update_changeattr(dir, &res.cinfo);
2032                 nfs_post_op_update_inode(dir, res.dir_attr);
2033                 nfs_post_op_update_inode(inode, res.fattr);
2034         }
2035
2036         return status;
2037 }
2038
2039 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2040 {
2041         struct nfs4_exception exception = { };
2042         int err;
2043         do {
2044                 err = nfs4_handle_exception(NFS_SERVER(inode),
2045                                 _nfs4_proc_link(inode, dir, name),
2046                                 &exception);
2047         } while (exception.retry);
2048         return err;
2049 }
2050
2051 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2052                 struct page *page, unsigned int len, struct iattr *sattr)
2053 {
2054         struct nfs_server *server = NFS_SERVER(dir);
2055         struct nfs_fh fhandle;
2056         struct nfs_fattr fattr, dir_fattr;
2057         struct nfs4_create_arg arg = {
2058                 .dir_fh = NFS_FH(dir),
2059                 .server = server,
2060                 .name = &dentry->d_name,
2061                 .attrs = sattr,
2062                 .ftype = NF4LNK,
2063                 .bitmask = server->attr_bitmask,
2064         };
2065         struct nfs4_create_res res = {
2066                 .server = server,
2067                 .fh = &fhandle,
2068                 .fattr = &fattr,
2069                 .dir_fattr = &dir_fattr,
2070         };
2071         struct rpc_message msg = {
2072                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2073                 .rpc_argp = &arg,
2074                 .rpc_resp = &res,
2075         };
2076         int                     status;
2077
2078         if (len > NFS4_MAXPATHLEN)
2079                 return -ENAMETOOLONG;
2080
2081         arg.u.symlink.pages = &page;
2082         arg.u.symlink.len = len;
2083         nfs_fattr_init(&fattr);
2084         nfs_fattr_init(&dir_fattr);
2085
2086         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2087         if (!status) {
2088                 update_changeattr(dir, &res.dir_cinfo);
2089                 nfs_post_op_update_inode(dir, res.dir_fattr);
2090                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2091         }
2092         return status;
2093 }
2094
2095 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2096                 struct page *page, unsigned int len, struct iattr *sattr)
2097 {
2098         struct nfs4_exception exception = { };
2099         int err;
2100         do {
2101                 err = nfs4_handle_exception(NFS_SERVER(dir),
2102                                 _nfs4_proc_symlink(dir, dentry, page,
2103                                                         len, sattr),
2104                                 &exception);
2105         } while (exception.retry);
2106         return err;
2107 }
2108
2109 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2110                 struct iattr *sattr)
2111 {
2112         struct nfs_server *server = NFS_SERVER(dir);
2113         struct nfs_fh fhandle;
2114         struct nfs_fattr fattr, dir_fattr;
2115         struct nfs4_create_arg arg = {
2116                 .dir_fh = NFS_FH(dir),
2117                 .server = server,
2118                 .name = &dentry->d_name,
2119                 .attrs = sattr,
2120                 .ftype = NF4DIR,
2121                 .bitmask = server->attr_bitmask,
2122         };
2123         struct nfs4_create_res res = {
2124                 .server = server,
2125                 .fh = &fhandle,
2126                 .fattr = &fattr,
2127                 .dir_fattr = &dir_fattr,
2128         };
2129         struct rpc_message msg = {
2130                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2131                 .rpc_argp = &arg,
2132                 .rpc_resp = &res,
2133         };
2134         int                     status;
2135
2136         nfs_fattr_init(&fattr);
2137         nfs_fattr_init(&dir_fattr);
2138
2139         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2140         if (!status) {
2141                 update_changeattr(dir, &res.dir_cinfo);
2142                 nfs_post_op_update_inode(dir, res.dir_fattr);
2143                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2144         }
2145         return status;
2146 }
2147
2148 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2149                 struct iattr *sattr)
2150 {
2151         struct nfs4_exception exception = { };
2152         int err;
2153         do {
2154                 err = nfs4_handle_exception(NFS_SERVER(dir),
2155                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2156                                 &exception);
2157         } while (exception.retry);
2158         return err;
2159 }
2160
2161 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2162                   u64 cookie, struct page *page, unsigned int count, int plus)
2163 {
2164         struct inode            *dir = dentry->d_inode;
2165         struct nfs4_readdir_arg args = {
2166                 .fh = NFS_FH(dir),
2167                 .pages = &page,
2168                 .pgbase = 0,
2169                 .count = count,
2170                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2171         };
2172         struct nfs4_readdir_res res;
2173         struct rpc_message msg = {
2174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2175                 .rpc_argp = &args,
2176                 .rpc_resp = &res,
2177                 .rpc_cred = cred,
2178         };
2179         int                     status;
2180
2181         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2182                         dentry->d_parent->d_name.name,
2183                         dentry->d_name.name,
2184                         (unsigned long long)cookie);
2185         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2186         res.pgbase = args.pgbase;
2187         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2188         if (status == 0)
2189                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2190         dprintk("%s: returns %d\n", __FUNCTION__, status);
2191         return status;
2192 }
2193
2194 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2195                   u64 cookie, struct page *page, unsigned int count, int plus)
2196 {
2197         struct nfs4_exception exception = { };
2198         int err;
2199         do {
2200                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2201                                 _nfs4_proc_readdir(dentry, cred, cookie,
2202                                         page, count, plus),
2203                                 &exception);
2204         } while (exception.retry);
2205         return err;
2206 }
2207
2208 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2209                 struct iattr *sattr, dev_t rdev)
2210 {
2211         struct nfs_server *server = NFS_SERVER(dir);
2212         struct nfs_fh fh;
2213         struct nfs_fattr fattr, dir_fattr;
2214         struct nfs4_create_arg arg = {
2215                 .dir_fh = NFS_FH(dir),
2216                 .server = server,
2217                 .name = &dentry->d_name,
2218                 .attrs = sattr,
2219                 .bitmask = server->attr_bitmask,
2220         };
2221         struct nfs4_create_res res = {
2222                 .server = server,
2223                 .fh = &fh,
2224                 .fattr = &fattr,
2225                 .dir_fattr = &dir_fattr,
2226         };
2227         struct rpc_message msg = {
2228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2229                 .rpc_argp = &arg,
2230                 .rpc_resp = &res,
2231         };
2232         int                     status;
2233         int                     mode = sattr->ia_mode;
2234
2235         nfs_fattr_init(&fattr);
2236         nfs_fattr_init(&dir_fattr);
2237
2238         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2239         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2240         if (S_ISFIFO(mode))
2241                 arg.ftype = NF4FIFO;
2242         else if (S_ISBLK(mode)) {
2243                 arg.ftype = NF4BLK;
2244                 arg.u.device.specdata1 = MAJOR(rdev);
2245                 arg.u.device.specdata2 = MINOR(rdev);
2246         }
2247         else if (S_ISCHR(mode)) {
2248                 arg.ftype = NF4CHR;
2249                 arg.u.device.specdata1 = MAJOR(rdev);
2250                 arg.u.device.specdata2 = MINOR(rdev);
2251         }
2252         else
2253                 arg.ftype = NF4SOCK;
2254
2255         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2256         if (status == 0) {
2257                 update_changeattr(dir, &res.dir_cinfo);
2258                 nfs_post_op_update_inode(dir, res.dir_fattr);
2259                 status = nfs_instantiate(dentry, &fh, &fattr);
2260         }
2261         return status;
2262 }
2263
2264 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2265                 struct iattr *sattr, dev_t rdev)
2266 {
2267         struct nfs4_exception exception = { };
2268         int err;
2269         do {
2270                 err = nfs4_handle_exception(NFS_SERVER(dir),
2271                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2272                                 &exception);
2273         } while (exception.retry);
2274         return err;
2275 }
2276
2277 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2278                  struct nfs_fsstat *fsstat)
2279 {
2280         struct nfs4_statfs_arg args = {
2281                 .fh = fhandle,
2282                 .bitmask = server->attr_bitmask,
2283         };
2284         struct rpc_message msg = {
2285                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2286                 .rpc_argp = &args,
2287                 .rpc_resp = fsstat,
2288         };
2289
2290         nfs_fattr_init(fsstat->fattr);
2291         return rpc_call_sync(server->client, &msg, 0);
2292 }
2293
2294 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2295 {
2296         struct nfs4_exception exception = { };
2297         int err;
2298         do {
2299                 err = nfs4_handle_exception(server,
2300                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2301                                 &exception);
2302         } while (exception.retry);
2303         return err;
2304 }
2305
2306 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2307                 struct nfs_fsinfo *fsinfo)
2308 {
2309         struct nfs4_fsinfo_arg args = {
2310                 .fh = fhandle,
2311                 .bitmask = server->attr_bitmask,
2312         };
2313         struct rpc_message msg = {
2314                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2315                 .rpc_argp = &args,
2316                 .rpc_resp = fsinfo,
2317         };
2318
2319         return rpc_call_sync(server->client, &msg, 0);
2320 }
2321
2322 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2323 {
2324         struct nfs4_exception exception = { };
2325         int err;
2326
2327         do {
2328                 err = nfs4_handle_exception(server,
2329                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2330                                 &exception);
2331         } while (exception.retry);
2332         return err;
2333 }
2334
2335 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2336 {
2337         nfs_fattr_init(fsinfo->fattr);
2338         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2339 }
2340
2341 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2342                 struct nfs_pathconf *pathconf)
2343 {
2344         struct nfs4_pathconf_arg args = {
2345                 .fh = fhandle,
2346                 .bitmask = server->attr_bitmask,
2347         };
2348         struct rpc_message msg = {
2349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2350                 .rpc_argp = &args,
2351                 .rpc_resp = pathconf,
2352         };
2353
2354         /* None of the pathconf attributes are mandatory to implement */
2355         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2356                 memset(pathconf, 0, sizeof(*pathconf));
2357                 return 0;
2358         }
2359
2360         nfs_fattr_init(pathconf->fattr);
2361         return rpc_call_sync(server->client, &msg, 0);
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_exception exception = { };
2368         int err;
2369
2370         do {
2371                 err = nfs4_handle_exception(server,
2372                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2373                                 &exception);
2374         } while (exception.retry);
2375         return err;
2376 }
2377
2378 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2379 {
2380         struct nfs_server *server = NFS_SERVER(data->inode);
2381
2382         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2383                 rpc_restart_call(task);
2384                 return -EAGAIN;
2385         }
2386         if (task->tk_status > 0)
2387                 renew_lease(server, data->timestamp);
2388         return 0;
2389 }
2390
2391 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2392 {
2393         struct rpc_message msg = {
2394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2395                 .rpc_argp = &data->args,
2396                 .rpc_resp = &data->res,
2397                 .rpc_cred = data->cred,
2398         };
2399
2400         data->timestamp   = jiffies;
2401
2402         rpc_call_setup(&data->task, &msg, 0);
2403 }
2404
2405 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2406 {
2407         struct inode *inode = data->inode;
2408
2409         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2410                 rpc_restart_call(task);
2411                 return -EAGAIN;
2412         }
2413         if (task->tk_status >= 0) {
2414                 renew_lease(NFS_SERVER(inode), data->timestamp);
2415                 nfs_post_op_update_inode(inode, data->res.fattr);
2416         }
2417         return 0;
2418 }
2419
2420 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2421 {
2422         struct rpc_message msg = {
2423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2424                 .rpc_argp = &data->args,
2425                 .rpc_resp = &data->res,
2426                 .rpc_cred = data->cred,
2427         };
2428         struct inode *inode = data->inode;
2429         struct nfs_server *server = NFS_SERVER(inode);
2430         int stable;
2431
2432         if (how & FLUSH_STABLE) {
2433                 if (!NFS_I(inode)->ncommit)
2434                         stable = NFS_FILE_SYNC;
2435                 else
2436                         stable = NFS_DATA_SYNC;
2437         } else
2438                 stable = NFS_UNSTABLE;
2439         data->args.stable = stable;
2440         data->args.bitmask = server->attr_bitmask;
2441         data->res.server = server;
2442
2443         data->timestamp   = jiffies;
2444
2445         /* Finalize the task. */
2446         rpc_call_setup(&data->task, &msg, 0);
2447 }
2448
2449 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2450 {
2451         struct inode *inode = data->inode;
2452
2453         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2454                 rpc_restart_call(task);
2455                 return -EAGAIN;
2456         }
2457         if (task->tk_status >= 0)
2458                 nfs_post_op_update_inode(inode, data->res.fattr);
2459         return 0;
2460 }
2461
2462 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2463 {
2464         struct rpc_message msg = {
2465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2466                 .rpc_argp = &data->args,
2467                 .rpc_resp = &data->res,
2468                 .rpc_cred = data->cred,
2469         };
2470         struct nfs_server *server = NFS_SERVER(data->inode);
2471
2472         data->args.bitmask = server->attr_bitmask;
2473         data->res.server = server;
2474
2475         rpc_call_setup(&data->task, &msg, 0);
2476 }
2477
2478 /*
2479  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2480  * standalone procedure for queueing an asynchronous RENEW.
2481  */
2482 static void nfs4_renew_done(struct rpc_task *task, void *data)
2483 {
2484         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2485         unsigned long timestamp = (unsigned long)data;
2486
2487         if (task->tk_status < 0) {
2488                 switch (task->tk_status) {
2489                         case -NFS4ERR_STALE_CLIENTID:
2490                         case -NFS4ERR_EXPIRED:
2491                         case -NFS4ERR_CB_PATH_DOWN:
2492                                 nfs4_schedule_state_recovery(clp);
2493                 }
2494                 return;
2495         }
2496         spin_lock(&clp->cl_lock);
2497         if (time_before(clp->cl_last_renewal,timestamp))
2498                 clp->cl_last_renewal = timestamp;
2499         spin_unlock(&clp->cl_lock);
2500 }
2501
2502 static const struct rpc_call_ops nfs4_renew_ops = {
2503         .rpc_call_done = nfs4_renew_done,
2504 };
2505
2506 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2507 {
2508         struct rpc_message msg = {
2509                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2510                 .rpc_argp       = clp,
2511                 .rpc_cred       = cred,
2512         };
2513
2514         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2515                         &nfs4_renew_ops, (void *)jiffies);
2516 }
2517
2518 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2519 {
2520         struct rpc_message msg = {
2521                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2522                 .rpc_argp       = clp,
2523                 .rpc_cred       = cred,
2524         };
2525         unsigned long now = jiffies;
2526         int status;
2527
2528         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2529         if (status < 0)
2530                 return status;
2531         spin_lock(&clp->cl_lock);
2532         if (time_before(clp->cl_last_renewal,now))
2533                 clp->cl_last_renewal = now;
2534         spin_unlock(&clp->cl_lock);
2535         return 0;
2536 }
2537
2538 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2539 {
2540         return (server->caps & NFS_CAP_ACLS)
2541                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2542                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2543 }
2544
2545 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2546  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2547  * the stack.
2548  */
2549 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2550
2551 static void buf_to_pages(const void *buf, size_t buflen,
2552                 struct page **pages, unsigned int *pgbase)
2553 {
2554         const void *p = buf;
2555
2556         *pgbase = offset_in_page(buf);
2557         p -= *pgbase;
2558         while (p < buf + buflen) {
2559                 *(pages++) = virt_to_page(p);
2560                 p += PAGE_CACHE_SIZE;
2561         }
2562 }
2563
2564 struct nfs4_cached_acl {
2565         int cached;
2566         size_t len;
2567         char data[0];
2568 };
2569
2570 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2571 {
2572         struct nfs_inode *nfsi = NFS_I(inode);
2573
2574         spin_lock(&inode->i_lock);
2575         kfree(nfsi->nfs4_acl);
2576         nfsi->nfs4_acl = acl;
2577         spin_unlock(&inode->i_lock);
2578 }
2579
2580 static void nfs4_zap_acl_attr(struct inode *inode)
2581 {
2582         nfs4_set_cached_acl(inode, NULL);
2583 }
2584
2585 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2586 {
2587         struct nfs_inode *nfsi = NFS_I(inode);
2588         struct nfs4_cached_acl *acl;
2589         int ret = -ENOENT;
2590
2591         spin_lock(&inode->i_lock);
2592         acl = nfsi->nfs4_acl;
2593         if (acl == NULL)
2594                 goto out;
2595         if (buf == NULL) /* user is just asking for length */
2596                 goto out_len;
2597         if (acl->cached == 0)
2598                 goto out;
2599         ret = -ERANGE; /* see getxattr(2) man page */
2600         if (acl->len > buflen)
2601                 goto out;
2602         memcpy(buf, acl->data, acl->len);
2603 out_len:
2604         ret = acl->len;
2605 out:
2606         spin_unlock(&inode->i_lock);
2607         return ret;
2608 }
2609
2610 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2611 {
2612         struct nfs4_cached_acl *acl;
2613
2614         if (buf && acl_len <= PAGE_SIZE) {
2615                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2616                 if (acl == NULL)
2617                         goto out;
2618                 acl->cached = 1;
2619                 memcpy(acl->data, buf, acl_len);
2620         } else {
2621                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2622                 if (acl == NULL)
2623                         goto out;
2624                 acl->cached = 0;
2625         }
2626         acl->len = acl_len;
2627 out:
2628         nfs4_set_cached_acl(inode, acl);
2629 }
2630
2631 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2632 {
2633         struct page *pages[NFS4ACL_MAXPAGES];
2634         struct nfs_getaclargs args = {
2635                 .fh = NFS_FH(inode),
2636                 .acl_pages = pages,
2637                 .acl_len = buflen,
2638         };
2639         size_t resp_len = buflen;
2640         void *resp_buf;
2641         struct rpc_message msg = {
2642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2643                 .rpc_argp = &args,
2644                 .rpc_resp = &resp_len,
2645         };
2646         struct page *localpage = NULL;
2647         int ret;
2648
2649         if (buflen < PAGE_SIZE) {
2650                 /* As long as we're doing a round trip to the server anyway,
2651                  * let's be prepared for a page of acl data. */
2652                 localpage = alloc_page(GFP_KERNEL);
2653                 resp_buf = page_address(localpage);
2654                 if (localpage == NULL)
2655                         return -ENOMEM;
2656                 args.acl_pages[0] = localpage;
2657                 args.acl_pgbase = 0;
2658                 resp_len = args.acl_len = PAGE_SIZE;
2659         } else {
2660                 resp_buf = buf;
2661                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2662         }
2663         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2664         if (ret)
2665                 goto out_free;
2666         if (resp_len > args.acl_len)
2667                 nfs4_write_cached_acl(inode, NULL, resp_len);
2668         else
2669                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2670         if (buf) {
2671                 ret = -ERANGE;
2672                 if (resp_len > buflen)
2673                         goto out_free;
2674                 if (localpage)
2675                         memcpy(buf, resp_buf, resp_len);
2676         }
2677         ret = resp_len;
2678 out_free:
2679         if (localpage)
2680                 __free_page(localpage);
2681         return ret;
2682 }
2683
2684 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2685 {
2686         struct nfs4_exception exception = { };
2687         ssize_t ret;
2688         do {
2689                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2690                 if (ret >= 0)
2691                         break;
2692                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2693         } while (exception.retry);
2694         return ret;
2695 }
2696
2697 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2698 {
2699         struct nfs_server *server = NFS_SERVER(inode);
2700         int ret;
2701
2702         if (!nfs4_server_supports_acls(server))
2703                 return -EOPNOTSUPP;
2704         ret = nfs_revalidate_inode(server, inode);
2705         if (ret < 0)
2706                 return ret;
2707         ret = nfs4_read_cached_acl(inode, buf, buflen);
2708         if (ret != -ENOENT)
2709                 return ret;
2710         return nfs4_get_acl_uncached(inode, buf, buflen);
2711 }
2712
2713 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2714 {
2715         struct nfs_server *server = NFS_SERVER(inode);
2716         struct page *pages[NFS4ACL_MAXPAGES];
2717         struct nfs_setaclargs arg = {
2718                 .fh             = NFS_FH(inode),
2719                 .acl_pages      = pages,
2720                 .acl_len        = buflen,
2721         };
2722         struct rpc_message msg = {
2723                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2724                 .rpc_argp       = &arg,
2725                 .rpc_resp       = NULL,
2726         };
2727         int ret;
2728
2729         if (!nfs4_server_supports_acls(server))
2730                 return -EOPNOTSUPP;
2731         nfs_inode_return_delegation(inode);
2732         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2733         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2734         nfs_zap_caches(inode);
2735         return ret;
2736 }
2737
2738 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2739 {
2740         struct nfs4_exception exception = { };
2741         int err;
2742         do {
2743                 err = nfs4_handle_exception(NFS_SERVER(inode),
2744                                 __nfs4_proc_set_acl(inode, buf, buflen),
2745                                 &exception);
2746         } while (exception.retry);
2747         return err;
2748 }
2749
2750 static int
2751 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2752 {
2753         struct nfs_client *clp = server->nfs_client;
2754
2755         if (!clp || task->tk_status >= 0)
2756                 return 0;
2757         switch(task->tk_status) {
2758                 case -NFS4ERR_STALE_CLIENTID:
2759                 case -NFS4ERR_STALE_STATEID:
2760                 case -NFS4ERR_EXPIRED:
2761                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2762                         nfs4_schedule_state_recovery(clp);
2763                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2764                                 rpc_wake_up_task(task);
2765                         task->tk_status = 0;
2766                         return -EAGAIN;
2767                 case -NFS4ERR_DELAY:
2768                         nfs_inc_server_stats((struct nfs_server *) server,
2769                                                 NFSIOS_DELAY);
2770                 case -NFS4ERR_GRACE:
2771                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2772                         task->tk_status = 0;
2773                         return -EAGAIN;
2774                 case -NFS4ERR_OLD_STATEID:
2775                         task->tk_status = 0;
2776                         return -EAGAIN;
2777         }
2778         task->tk_status = nfs4_map_errors(task->tk_status);
2779         return 0;
2780 }
2781
2782 static int nfs4_wait_bit_interruptible(void *word)
2783 {
2784         if (signal_pending(current))
2785                 return -ERESTARTSYS;
2786         schedule();
2787         return 0;
2788 }
2789
2790 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2791 {
2792         sigset_t oldset;
2793         int res;
2794
2795         might_sleep();
2796
2797         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2798
2799         rpc_clnt_sigmask(clnt, &oldset);
2800         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2801                         nfs4_wait_bit_interruptible,
2802                         TASK_INTERRUPTIBLE);
2803         rpc_clnt_sigunmask(clnt, &oldset);
2804
2805         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2806         return res;
2807 }
2808
2809 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2810 {
2811         sigset_t oldset;
2812         int res = 0;
2813
2814         might_sleep();
2815
2816         if (*timeout <= 0)
2817                 *timeout = NFS4_POLL_RETRY_MIN;
2818         if (*timeout > NFS4_POLL_RETRY_MAX)
2819                 *timeout = NFS4_POLL_RETRY_MAX;
2820         rpc_clnt_sigmask(clnt, &oldset);
2821         if (clnt->cl_intr) {
2822                 schedule_timeout_interruptible(*timeout);
2823                 if (signalled())
2824                         res = -ERESTARTSYS;
2825         } else
2826                 schedule_timeout_uninterruptible(*timeout);
2827         rpc_clnt_sigunmask(clnt, &oldset);
2828         *timeout <<= 1;
2829         return res;
2830 }
2831
2832 /* This is the error handling routine for processes that are allowed
2833  * to sleep.
2834  */
2835 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2836 {
2837         struct nfs_client *clp = server->nfs_client;
2838         int ret = errorcode;
2839
2840         exception->retry = 0;
2841         switch(errorcode) {
2842                 case 0:
2843                         return 0;
2844                 case -NFS4ERR_STALE_CLIENTID:
2845                 case -NFS4ERR_STALE_STATEID:
2846                 case -NFS4ERR_EXPIRED:
2847                         nfs4_schedule_state_recovery(clp);
2848                         ret = nfs4_wait_clnt_recover(server->client, clp);
2849                         if (ret == 0)
2850                                 exception->retry = 1;
2851                         break;
2852                 case -NFS4ERR_FILE_OPEN:
2853                 case -NFS4ERR_GRACE:
2854                 case -NFS4ERR_DELAY:
2855                         ret = nfs4_delay(server->client, &exception->timeout);
2856                         if (ret != 0)
2857                                 break;
2858                 case -NFS4ERR_OLD_STATEID:
2859                         exception->retry = 1;
2860         }
2861         /* We failed to handle the error */
2862         return nfs4_map_errors(ret);
2863 }
2864
2865 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2866 {
2867         nfs4_verifier sc_verifier;
2868         struct nfs4_setclientid setclientid = {
2869                 .sc_verifier = &sc_verifier,
2870                 .sc_prog = program,
2871         };
2872         struct rpc_message msg = {
2873                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2874                 .rpc_argp = &setclientid,
2875                 .rpc_resp = clp,
2876                 .rpc_cred = cred,
2877         };
2878         __be32 *p;
2879         int loop = 0;
2880         int status;
2881
2882         p = (__be32*)sc_verifier.data;
2883         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2884         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2885
2886         for(;;) {
2887                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2888                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2889                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2890                                 cred->cr_ops->cr_name,
2891                                 clp->cl_id_uniquifier);
2892                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2893                                 sizeof(setclientid.sc_netid), "tcp");
2894                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2895                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2896                                 clp->cl_ipaddr, port >> 8, port & 255);
2897
2898                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2899                 if (status != -NFS4ERR_CLID_INUSE)
2900                         break;
2901                 if (signalled())
2902                         break;
2903                 if (loop++ & 1)
2904                         ssleep(clp->cl_lease_time + 1);
2905                 else
2906                         if (++clp->cl_id_uniquifier == 0)
2907                                 break;
2908         }
2909         return status;
2910 }
2911
2912 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2913 {
2914         struct nfs_fsinfo fsinfo;
2915         struct rpc_message msg = {
2916                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2917                 .rpc_argp = clp,
2918                 .rpc_resp = &fsinfo,
2919                 .rpc_cred = cred,
2920         };
2921         unsigned long now;
2922         int status;
2923
2924         now = jiffies;
2925         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2926         if (status == 0) {
2927                 spin_lock(&clp->cl_lock);
2928                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2929                 clp->cl_last_renewal = now;
2930                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2931                 spin_unlock(&clp->cl_lock);
2932         }
2933         return status;
2934 }
2935
2936 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2937 {
2938         long timeout;
2939         int err;
2940         do {
2941                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2942                 switch (err) {
2943                         case 0:
2944                                 return err;
2945                         case -NFS4ERR_RESOURCE:
2946                                 /* The IBM lawyers misread another document! */
2947                         case -NFS4ERR_DELAY:
2948                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2949                 }
2950         } while (err == 0);
2951         return err;
2952 }
2953
2954 struct nfs4_delegreturndata {
2955         struct nfs4_delegreturnargs args;
2956         struct nfs4_delegreturnres res;
2957         struct nfs_fh fh;
2958         nfs4_stateid stateid;
2959         struct rpc_cred *cred;
2960         unsigned long timestamp;
2961         struct nfs_fattr fattr;
2962         int rpc_status;
2963 };
2964
2965 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2966 {
2967         struct nfs4_delegreturndata *data = calldata;
2968         struct rpc_message msg = {
2969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2970                 .rpc_argp = &data->args,
2971                 .rpc_resp = &data->res,
2972                 .rpc_cred = data->cred,
2973         };
2974         nfs_fattr_init(data->res.fattr);
2975         rpc_call_setup(task, &msg, 0);
2976 }
2977
2978 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2979 {
2980         struct nfs4_delegreturndata *data = calldata;
2981         data->rpc_status = task->tk_status;
2982         if (data->rpc_status == 0)
2983                 renew_lease(data->res.server, data->timestamp);
2984 }
2985
2986 static void nfs4_delegreturn_release(void *calldata)
2987 {
2988         struct nfs4_delegreturndata *data = calldata;
2989
2990         put_rpccred(data->cred);
2991         kfree(calldata);
2992 }
2993
2994 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2995         .rpc_call_prepare = nfs4_delegreturn_prepare,
2996         .rpc_call_done = nfs4_delegreturn_done,
2997         .rpc_release = nfs4_delegreturn_release,
2998 };
2999
3000 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3001 {
3002         struct nfs4_delegreturndata *data;
3003         struct nfs_server *server = NFS_SERVER(inode);
3004         struct rpc_task *task;
3005         int status;
3006
3007         data = kmalloc(sizeof(*data), GFP_KERNEL);
3008         if (data == NULL)
3009                 return -ENOMEM;
3010         data->args.fhandle = &data->fh;
3011         data->args.stateid = &data->stateid;
3012         data->args.bitmask = server->attr_bitmask;
3013         nfs_copy_fh(&data->fh, NFS_FH(inode));
3014         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3015         data->res.fattr = &data->fattr;
3016         data->res.server = server;
3017         data->cred = get_rpccred(cred);
3018         data->timestamp = jiffies;
3019         data->rpc_status = 0;
3020
3021         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3022         if (IS_ERR(task))
3023                 return PTR_ERR(task);
3024         status = nfs4_wait_for_completion_rpc_task(task);
3025         if (status == 0) {
3026                 status = data->rpc_status;
3027                 if (status == 0)
3028                         nfs_post_op_update_inode(inode, &data->fattr);
3029         }
3030         rpc_put_task(task);
3031         return status;
3032 }
3033
3034 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3035 {
3036         struct nfs_server *server = NFS_SERVER(inode);
3037         struct nfs4_exception exception = { };
3038         int err;
3039         do {
3040                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3041                 switch (err) {
3042                         case -NFS4ERR_STALE_STATEID:
3043                         case -NFS4ERR_EXPIRED:
3044                         case 0:
3045                                 return 0;
3046                 }
3047                 err = nfs4_handle_exception(server, err, &exception);
3048         } while (exception.retry);
3049         return err;
3050 }
3051
3052 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3053 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3054
3055 /*
3056  * sleep, with exponential backoff, and retry the LOCK operation.
3057  */
3058 static unsigned long
3059 nfs4_set_lock_task_retry(unsigned long timeout)
3060 {
3061         schedule_timeout_interruptible(timeout);
3062         timeout <<= 1;
3063         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3064                 return NFS4_LOCK_MAXTIMEOUT;
3065         return timeout;
3066 }
3067
3068 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3069 {
3070         struct inode *inode = state->inode;
3071         struct nfs_server *server = NFS_SERVER(inode);
3072         struct nfs_client *clp = server->nfs_client;
3073         struct nfs_lockt_args arg = {
3074                 .fh = NFS_FH(inode),
3075                 .fl = request,
3076         };
3077         struct nfs_lockt_res res = {
3078                 .denied = request,
3079         };
3080         struct rpc_message msg = {
3081                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3082                 .rpc_argp       = &arg,
3083                 .rpc_resp       = &res,
3084                 .rpc_cred       = state->owner->so_cred,
3085         };
3086         struct nfs4_lock_state *lsp;
3087         int status;
3088
3089         down_read(&clp->cl_sem);
3090         arg.lock_owner.clientid = clp->cl_clientid;
3091         status = nfs4_set_lock_state(state, request);
3092         if (status != 0)
3093                 goto out;
3094         lsp = request->fl_u.nfs4_fl.owner;
3095         arg.lock_owner.id = lsp->ls_id.id;
3096         status = rpc_call_sync(server->client, &msg, 0);
3097         switch (status) {
3098                 case 0:
3099                         request->fl_type = F_UNLCK;
3100                         break;
3101                 case -NFS4ERR_DENIED:
3102                         status = 0;
3103         }
3104         request->fl_ops->fl_release_private(request);
3105 out:
3106         up_read(&clp->cl_sem);
3107         return status;
3108 }
3109
3110 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3111 {
3112         struct nfs4_exception exception = { };
3113         int err;
3114
3115         do {
3116                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3117                                 _nfs4_proc_getlk(state, cmd, request),
3118                                 &exception);
3119         } while (exception.retry);
3120         return err;
3121 }
3122
3123 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3124 {
3125         int res = 0;
3126         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3127                 case FL_POSIX:
3128                         res = posix_lock_file_wait(file, fl);
3129                         break;
3130                 case FL_FLOCK:
3131                         res = flock_lock_file_wait(file, fl);
3132                         break;
3133                 default:
3134                         BUG();
3135         }
3136         return res;
3137 }
3138
3139 struct nfs4_unlockdata {
3140         struct nfs_locku_args arg;
3141         struct nfs_locku_res res;
3142         struct nfs4_lock_state *lsp;
3143         struct nfs_open_context *ctx;
3144         struct file_lock fl;
3145         const struct nfs_server *server;
3146         unsigned long timestamp;
3147 };
3148
3149 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3150                 struct nfs_open_context *ctx,
3151                 struct nfs4_lock_state *lsp,
3152                 struct nfs_seqid *seqid)
3153 {
3154         struct nfs4_unlockdata *p;
3155         struct inode *inode = lsp->ls_state->inode;
3156
3157         p = kmalloc(sizeof(*p), GFP_KERNEL);
3158         if (p == NULL)
3159                 return NULL;
3160         p->arg.fh = NFS_FH(inode);
3161         p->arg.fl = &p->fl;
3162         p->arg.seqid = seqid;
3163         p->arg.stateid = &lsp->ls_stateid;
3164         p->lsp = lsp;
3165         atomic_inc(&lsp->ls_count);
3166         /* Ensure we don't close file until we're done freeing locks! */
3167         p->ctx = get_nfs_open_context(ctx);
3168         memcpy(&p->fl, fl, sizeof(p->fl));
3169         p->server = NFS_SERVER(inode);
3170         return p;
3171 }
3172
3173 static void nfs4_locku_release_calldata(void *data)
3174 {
3175         struct nfs4_unlockdata *calldata = data;
3176         nfs_free_seqid(calldata->arg.seqid);
3177         nfs4_put_lock_state(calldata->lsp);
3178         put_nfs_open_context(calldata->ctx);
3179         kfree(calldata);
3180 }
3181
3182 static void nfs4_locku_done(struct rpc_task *task, void *data)
3183 {
3184         struct nfs4_unlockdata *calldata = data;
3185
3186         if (RPC_ASSASSINATED(task))
3187                 return;
3188         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3189         switch (task->tk_status) {
3190                 case 0:
3191                         memcpy(calldata->lsp->ls_stateid.data,
3192                                         calldata->res.stateid.data,
3193                                         sizeof(calldata->lsp->ls_stateid.data));
3194                         renew_lease(calldata->server, calldata->timestamp);
3195                         break;
3196                 case -NFS4ERR_STALE_STATEID:
3197                 case -NFS4ERR_EXPIRED:
3198                         break;
3199                 default:
3200                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3201                                 rpc_restart_call(task);
3202         }
3203 }
3204
3205 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3206 {
3207         struct nfs4_unlockdata *calldata = data;
3208         struct rpc_message msg = {
3209                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3210                 .rpc_argp       = &calldata->arg,
3211                 .rpc_resp       = &calldata->res,
3212                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3213         };
3214
3215         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3216                 return;
3217         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3218                 /* Note: exit _without_ running nfs4_locku_done */
3219                 task->tk_action = NULL;
3220                 return;
3221         }
3222         calldata->timestamp = jiffies;
3223         rpc_call_setup(task, &msg, 0);
3224 }
3225
3226 static const struct rpc_call_ops nfs4_locku_ops = {
3227         .rpc_call_prepare = nfs4_locku_prepare,
3228         .rpc_call_done = nfs4_locku_done,
3229         .rpc_release = nfs4_locku_release_calldata,
3230 };
3231
3232 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3233                 struct nfs_open_context *ctx,
3234                 struct nfs4_lock_state *lsp,
3235                 struct nfs_seqid *seqid)
3236 {
3237         struct nfs4_unlockdata *data;
3238
3239         /* Ensure this is an unlock - when canceling a lock, the
3240          * canceled lock is passed in, and it won't be an unlock.
3241          */
3242         fl->fl_type = F_UNLCK;
3243
3244         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3245         if (data == NULL) {
3246                 nfs_free_seqid(seqid);
3247                 return ERR_PTR(-ENOMEM);
3248         }
3249
3250         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3251 }
3252
3253 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3254 {
3255         struct nfs_seqid *seqid;
3256         struct nfs4_lock_state *lsp;
3257         struct rpc_task *task;
3258         int status = 0;
3259
3260         status = nfs4_set_lock_state(state, request);
3261         /* Unlock _before_ we do the RPC call */
3262         request->fl_flags |= FL_EXISTS;
3263         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3264                 goto out;
3265         if (status != 0)
3266                 goto out;
3267         /* Is this a delegated lock? */
3268         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3269                 goto out;
3270         lsp = request->fl_u.nfs4_fl.owner;
3271         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3272         status = -ENOMEM;
3273         if (seqid == NULL)
3274                 goto out;
3275         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3276         status = PTR_ERR(task);
3277         if (IS_ERR(task))
3278                 goto out;
3279         status = nfs4_wait_for_completion_rpc_task(task);
3280         rpc_put_task(task);
3281 out:
3282         return status;
3283 }
3284
3285 struct nfs4_lockdata {
3286         struct nfs_lock_args arg;
3287         struct nfs_lock_res res;
3288         struct nfs4_lock_state *lsp;
3289         struct nfs_open_context *ctx;
3290         struct file_lock fl;
3291         unsigned long timestamp;
3292         int rpc_status;
3293         int cancelled;
3294 };
3295
3296 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3297                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3298 {
3299         struct nfs4_lockdata *p;
3300         struct inode *inode = lsp->ls_state->inode;
3301         struct nfs_server *server = NFS_SERVER(inode);
3302
3303         p = kzalloc(sizeof(*p), GFP_KERNEL);
3304         if (p == NULL)
3305                 return NULL;
3306
3307         p->arg.fh = NFS_FH(inode);
3308         p->arg.fl = &p->fl;
3309         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3310         if (p->arg.lock_seqid == NULL)
3311                 goto out_free;
3312         p->arg.lock_stateid = &lsp->ls_stateid;
3313         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3314         p->arg.lock_owner.id = lsp->ls_id.id;
3315         p->lsp = lsp;
3316         atomic_inc(&lsp->ls_count);
3317         p->ctx = get_nfs_open_context(ctx);
3318         memcpy(&p->fl, fl, sizeof(p->fl));
3319         return p;
3320 out_free:
3321         kfree(p);
3322         return NULL;
3323 }
3324
3325 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3326 {
3327         struct nfs4_lockdata *data = calldata;
3328         struct nfs4_state *state = data->lsp->ls_state;
3329         struct nfs4_state_owner *sp = state->owner;
3330         struct rpc_message msg = {
3331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3332                 .rpc_argp = &data->arg,
3333                 .rpc_resp = &data->res,
3334                 .rpc_cred = sp->so_cred,
3335         };
3336
3337         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3338                 return;
3339         dprintk("%s: begin!\n", __FUNCTION__);
3340         /* Do we need to do an open_to_lock_owner? */
3341         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3342                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3343                 if (data->arg.open_seqid == NULL) {
3344                         data->rpc_status = -ENOMEM;
3345                         task->tk_action = NULL;
3346                         goto out;
3347                 }
3348                 data->arg.open_stateid = &state->stateid;
3349                 data->arg.new_lock_owner = 1;
3350         }
3351         data->timestamp = jiffies;
3352         rpc_call_setup(task, &msg, 0);
3353 out:
3354         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3355 }
3356
3357 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3358 {
3359         struct nfs4_lockdata *data = calldata;
3360
3361         dprintk("%s: begin!\n", __FUNCTION__);
3362
3363         data->rpc_status = task->tk_status;
3364         if (RPC_ASSASSINATED(task))
3365                 goto out;
3366         if (data->arg.new_lock_owner != 0) {
3367                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3368                 if (data->rpc_status == 0)
3369                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3370                 else
3371                         goto out;
3372         }
3373         if (data->rpc_status == 0) {
3374                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3375                                         sizeof(data->lsp->ls_stateid.data));
3376                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3377                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3378         }
3379         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3380 out:
3381         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3382 }
3383
3384 static void nfs4_lock_release(void *calldata)
3385 {
3386         struct nfs4_lockdata *data = calldata;
3387
3388         dprintk("%s: begin!\n", __FUNCTION__);
3389         if (data->arg.open_seqid != NULL)
3390                 nfs_free_seqid(data->arg.open_seqid);
3391         if (data->cancelled != 0) {
3392                 struct rpc_task *task;
3393                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3394                                 data->arg.lock_seqid);
3395                 if (!IS_ERR(task))
3396                         rpc_put_task(task);
3397                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3398         } else
3399                 nfs_free_seqid(data->arg.lock_seqid);
3400         nfs4_put_lock_state(data->lsp);
3401         put_nfs_open_context(data->ctx);
3402         kfree(data);
3403         dprintk("%s: done!\n", __FUNCTION__);
3404 }
3405
3406 static const struct rpc_call_ops nfs4_lock_ops = {
3407         .rpc_call_prepare = nfs4_lock_prepare,
3408         .rpc_call_done = nfs4_lock_done,
3409         .rpc_release = nfs4_lock_release,
3410 };
3411
3412 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3413 {
3414         struct nfs4_lockdata *data;
3415         struct rpc_task *task;
3416         int ret;
3417
3418         dprintk("%s: begin!\n", __FUNCTION__);
3419         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3420                         fl->fl_u.nfs4_fl.owner);
3421         if (data == NULL)
3422                 return -ENOMEM;
3423         if (IS_SETLKW(cmd))
3424                 data->arg.block = 1;
3425         if (reclaim != 0)
3426                 data->arg.reclaim = 1;
3427         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3428                         &nfs4_lock_ops, data);
3429         if (IS_ERR(task))
3430                 return PTR_ERR(task);
3431         ret = nfs4_wait_for_completion_rpc_task(task);
3432         if (ret == 0) {
3433                 ret = data->rpc_status;
3434                 if (ret == -NFS4ERR_DENIED)
3435                         ret = -EAGAIN;
3436         } else
3437                 data->cancelled = 1;
3438         rpc_put_task(task);
3439         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3440         return ret;
3441 }
3442
3443 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3444 {
3445         struct nfs_server *server = NFS_SERVER(state->inode);
3446         struct nfs4_exception exception = { };
3447         int err;
3448
3449         do {
3450                 /* Cache the lock if possible... */
3451                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3452                         return 0;
3453                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3454                 if (err != -NFS4ERR_DELAY)
3455                         break;
3456                 nfs4_handle_exception(server, err, &exception);
3457         } while (exception.retry);
3458         return err;
3459 }
3460
3461 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3462 {
3463         struct nfs_server *server = NFS_SERVER(state->inode);
3464         struct nfs4_exception exception = { };
3465         int err;
3466
3467         err = nfs4_set_lock_state(state, request);
3468         if (err != 0)
3469                 return err;
3470         do {
3471                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3472                         return 0;
3473                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3474                 if (err != -NFS4ERR_DELAY)
3475                         break;
3476                 nfs4_handle_exception(server, err, &exception);
3477         } while (exception.retry);
3478         return err;
3479 }
3480
3481 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3482 {
3483         struct nfs_client *clp = state->owner->so_client;
3484         unsigned char fl_flags = request->fl_flags;
3485         int status;
3486
3487         /* Is this a delegated open? */
3488         status = nfs4_set_lock_state(state, request);
3489         if (status != 0)
3490                 goto out;
3491         request->fl_flags |= FL_ACCESS;
3492         status = do_vfs_lock(request->fl_file, request);
3493         if (status < 0)
3494                 goto out;
3495         down_read(&clp->cl_sem);
3496         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3497                 struct nfs_inode *nfsi = NFS_I(state->inode);
3498                 /* Yes: cache locks! */
3499                 down_read(&nfsi->rwsem);
3500                 /* ...but avoid races with delegation recall... */
3501                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3502                         request->fl_flags = fl_flags & ~FL_SLEEP;
3503                         status = do_vfs_lock(request->fl_file, request);
3504                         up_read(&nfsi->rwsem);
3505                         goto out_unlock;
3506                 }
3507                 up_read(&nfsi->rwsem);
3508         }
3509         status = _nfs4_do_setlk(state, cmd, request, 0);
3510         if (status != 0)
3511                 goto out_unlock;
3512         /* Note: we always want to sleep here! */
3513         request->fl_flags = fl_flags | FL_SLEEP;
3514         if (do_vfs_lock(request->fl_file, request) < 0)
3515                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3516 out_unlock:
3517         up_read(&clp->cl_sem);
3518 out:
3519         request->fl_flags = fl_flags;
3520         return status;
3521 }
3522
3523 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3524 {
3525         struct nfs4_exception exception = { };
3526         int err;
3527
3528         do {
3529                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3530                                 _nfs4_proc_setlk(state, cmd, request),
3531                                 &exception);
3532         } while (exception.retry);
3533         return err;
3534 }
3535
3536 static int
3537 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3538 {
3539         struct nfs_open_context *ctx;
3540         struct nfs4_state *state;
3541         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3542         int status;
3543
3544         /* verify open state */
3545         ctx = nfs_file_open_context(filp);
3546         state = ctx->state;
3547
3548         if (request->fl_start < 0 || request->fl_end < 0)
3549                 return -EINVAL;
3550
3551         if (IS_GETLK(cmd))
3552                 return nfs4_proc_getlk(state, F_GETLK, request);
3553
3554         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3555                 return -EINVAL;
3556
3557         if (request->fl_type == F_UNLCK)
3558                 return nfs4_proc_unlck(state, cmd, request);
3559
3560         do {
3561                 status = nfs4_proc_setlk(state, cmd, request);
3562                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3563                         break;
3564                 timeout = nfs4_set_lock_task_retry(timeout);
3565                 status = -ERESTARTSYS;
3566                 if (signalled())
3567                         break;
3568         } while(status < 0);
3569         return status;
3570 }
3571
3572 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3573 {
3574         struct nfs_server *server = NFS_SERVER(state->inode);
3575         struct nfs4_exception exception = { };
3576         int err;
3577
3578         err = nfs4_set_lock_state(state, fl);
3579         if (err != 0)
3580                 goto out;
3581         do {
3582                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3583                 if (err != -NFS4ERR_DELAY)
3584                         break;
3585                 err = nfs4_handle_exception(server, err, &exception);
3586         } while (exception.retry);
3587 out:
3588         return err;
3589 }
3590
3591 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3592
3593 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3594                 size_t buflen, int flags)
3595 {
3596         struct inode *inode = dentry->d_inode;
3597
3598         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3599                 return -EOPNOTSUPP;
3600
3601         if (!S_ISREG(inode->i_mode) &&
3602             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3603                 return -EPERM;
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", __FUNCTION__);
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", __FUNCTION__, 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         .file_open      = nfs_open,
3720         .file_release   = nfs_release,
3721         .lock           = nfs4_proc_lock,
3722         .clear_acl_cache = nfs4_zap_acl_attr,
3723 };
3724
3725 /*
3726  * Local variables:
3727  *  c-basic-offset: 8
3728  * End:
3729  */