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   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         if (cinfo->after != nfsi->change_attr) {
 212                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 213                 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 214                         nfsi->cache_change_attribute = jiffies;
 215                 nfsi->change_attr = cinfo->after;
 216         }
 217         spin_unlock(&dir->i_lock);
 218 }
 219
 220 struct nfs4_opendata {
 221         struct kref kref;
 222         struct nfs_openargs o_arg;
 223         struct nfs_openres o_res;
 224         struct nfs_open_confirmargs c_arg;
 225         struct nfs_open_confirmres c_res;
 226         struct nfs_fattr f_attr;
 227         struct nfs_fattr dir_attr;
 228         struct path path;
 229         struct dentry *dir;
 230         struct nfs4_state_owner *owner;
 231         struct nfs4_state *state;
 232         struct iattr attrs;
 233         unsigned long timestamp;
 234         unsigned int rpc_done : 1;
 235         int rpc_status;
 236         int cancelled;
 237 };
 238
 239
 240 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 241 {
 242         p->o_res.f_attr = &p->f_attr;
 243         p->o_res.dir_attr = &p->dir_attr;
 244         p->o_res.server = p->o_arg.server;
 245         nfs_fattr_init(&p->f_attr);
 246         nfs_fattr_init(&p->dir_attr);
 247 }
 248
 249 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 250                 struct nfs4_state_owner *sp, int flags,
 251                 const struct iattr *attrs)
 252 {
 253         struct dentry *parent = dget_parent(path->dentry);
 254         struct inode *dir = parent->d_inode;
 255         struct nfs_server *server = NFS_SERVER(dir);
 256         struct nfs4_opendata *p;
 257
 258         p = kzalloc(sizeof(*p), GFP_KERNEL);
 259         if (p == NULL)
 260                 goto err;
 261         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 262         if (p->o_arg.seqid == NULL)
 263                 goto err_free;
 264         p->path.mnt = mntget(path->mnt);
 265         p->path.dentry = dget(path->dentry);
 266         p->dir = parent;
 267         p->owner = sp;
 268         atomic_inc(&sp->so_count);
 269         p->o_arg.fh = NFS_FH(dir);
 270         p->o_arg.open_flags = flags,
 271         p->o_arg.clientid = server->nfs_client->cl_clientid;
 272         p->o_arg.id = sp->so_owner_id.id;
 273         p->o_arg.name = &p->path.dentry->d_name;
 274         p->o_arg.server = server;
 275         p->o_arg.bitmask = server->attr_bitmask;
 276         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 277         if (flags & O_EXCL) {
 278                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 279                 s[0] = jiffies;
 280                 s[1] = current->pid;
 281         } else if (flags & O_CREAT) {
 282                 p->o_arg.u.attrs = &p->attrs;
 283                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 284         }
 285         p->c_arg.fh = &p->o_res.fh;
 286         p->c_arg.stateid = &p->o_res.stateid;
 287         p->c_arg.seqid = p->o_arg.seqid;
 288         nfs4_init_opendata_res(p);
 289         kref_init(&p->kref);
 290         return p;
 291 err_free:
 292         kfree(p);
 293 err:
 294         dput(parent);
 295         return NULL;
 296 }
 297
 298 static void nfs4_opendata_free(struct kref *kref)
 299 {
 300         struct nfs4_opendata *p = container_of(kref,
 301                         struct nfs4_opendata, kref);
 302
 303         nfs_free_seqid(p->o_arg.seqid);
 304         if (p->state != NULL)
 305                 nfs4_put_open_state(p->state);
 306         nfs4_put_state_owner(p->owner);
 307         dput(p->dir);
 308         dput(p->path.dentry);
 309         mntput(p->path.mnt);
 310         kfree(p);
 311 }
 312
 313 static void nfs4_opendata_put(struct nfs4_opendata *p)
 314 {
 315         if (p != NULL)
 316                 kref_put(&p->kref, nfs4_opendata_free);
 317 }
 318
 319 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 320 {
 321         sigset_t oldset;
 322         int ret;
 323
 324         rpc_clnt_sigmask(task->tk_client, &oldset);
 325         ret = rpc_wait_for_completion_task(task);
 326         rpc_clnt_sigunmask(task->tk_client, &oldset);
 327         return ret;
 328 }
 329
 330 static int can_open_cached(struct nfs4_state *state, int mode)
 331 {
 332         int ret = 0;
 333         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 334                 case FMODE_READ:
 335                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 336                         break;
 337                 case FMODE_WRITE:
 338                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 339                         break;
 340                 case FMODE_READ|FMODE_WRITE:
 341                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 342         }
 343         return ret;
 344 }
 345
 346 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 347 {
 348         if ((delegation->type & open_flags) != open_flags)
 349                 return 0;
 350         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 351                 return 0;
 352         return 1;
 353 }
 354
 355 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 356 {
 357         switch (open_flags) {
 358                 case FMODE_WRITE:
 359                         state->n_wronly++;
 360                         break;
 361                 case FMODE_READ:
 362                         state->n_rdonly++;
 363                         break;
 364                 case FMODE_READ|FMODE_WRITE:
 365                         state->n_rdwr++;
 366         }
 367         nfs4_state_set_mode_locked(state, state->state | open_flags);
 368 }
 369
 370 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 371 {
 372         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 373                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 374         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 375         switch (open_flags) {
 376                 case FMODE_READ:
 377                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 378                         break;
 379                 case FMODE_WRITE:
 380                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 381                         break;
 382                 case FMODE_READ|FMODE_WRITE:
 383                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 384         }
 385 }
 386
 387 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 388 {
 389         write_seqlock(&state->seqlock);
 390         nfs_set_open_stateid_locked(state, stateid, open_flags);
 391         write_sequnlock(&state->seqlock);
 392 }
 393
 394 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 395 {
 396         open_flags &= (FMODE_READ|FMODE_WRITE);
 397         /*
 398          * Protect the call to nfs4_state_set_mode_locked and
 399          * serialise the stateid update
 400          */
 401         write_seqlock(&state->seqlock);
 402         if (deleg_stateid != NULL) {
 403                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 404                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 405         }
 406         if (open_stateid != NULL)
 407                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 408         write_sequnlock(&state->seqlock);
 409         spin_lock(&state->owner->so_lock);
 410         update_open_stateflags(state, open_flags);
 411         spin_unlock(&state->owner->so_lock);
 412 }
 413
 414 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 415 {
 416         struct nfs_delegation *delegation;
 417
 418         rcu_read_lock();
 419         delegation = rcu_dereference(NFS_I(inode)->delegation);
 420         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 421                 rcu_read_unlock();
 422                 return;
 423         }
 424         rcu_read_unlock();
 425         nfs_inode_return_delegation(inode);
 426 }
 427
 428 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 429 {
 430         struct nfs4_state *state = opendata->state;
 431         struct nfs_inode *nfsi = NFS_I(state->inode);
 432         struct nfs_delegation *delegation;
 433         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 434         nfs4_stateid stateid;
 435         int ret = -EAGAIN;
 436
 437         rcu_read_lock();
 438         delegation = rcu_dereference(nfsi->delegation);
 439         for (;;) {
 440                 if (can_open_cached(state, open_mode)) {
 441                         spin_lock(&state->owner->so_lock);
 442                         if (can_open_cached(state, open_mode)) {
 443                                 update_open_stateflags(state, open_mode);
 444                                 spin_unlock(&state->owner->so_lock);
 445                                 rcu_read_unlock();
 446                                 goto out_return_state;
 447                         }
 448                         spin_unlock(&state->owner->so_lock);
 449                 }
 450                 if (delegation == NULL)
 451                         break;
 452                 if (!can_open_delegated(delegation, open_mode))
 453                         break;
 454                 /* Save the delegation */
 455                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 456                 rcu_read_unlock();
 457                 lock_kernel();
 458                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 459                 unlock_kernel();
 460                 if (ret != 0)
 461                         goto out;
 462                 ret = -EAGAIN;
 463                 rcu_read_lock();
 464                 delegation = rcu_dereference(nfsi->delegation);
 465                 /* If no delegation, try a cached open */
 466                 if (delegation == NULL)
 467                         continue;
 468                 /* Is the delegation still valid? */
 469                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 470                         continue;
 471                 rcu_read_unlock();
 472                 update_open_stateid(state, NULL, &stateid, open_mode);
 473                 goto out_return_state;
 474         }
 475         rcu_read_unlock();
 476 out:
 477         return ERR_PTR(ret);
 478 out_return_state:
 479         atomic_inc(&state->count);
 480         return state;
 481 }
 482
 483 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 484 {
 485         struct inode *inode;
 486         struct nfs4_state *state = NULL;
 487         struct nfs_delegation *delegation;
 488         nfs4_stateid *deleg_stateid = NULL;
 489         int ret;
 490
 491         if (!data->rpc_done) {
 492                 state = nfs4_try_open_cached(data);
 493                 goto out;
 494         }
 495
 496         ret = -EAGAIN;
 497         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 498                 goto err;
 499         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 500         ret = PTR_ERR(inode);
 501         if (IS_ERR(inode))
 502                 goto err;
 503         ret = -ENOMEM;
 504         state = nfs4_get_open_state(inode, data->owner);
 505         if (state == NULL)
 506                 goto err_put_inode;
 507         if (data->o_res.delegation_type != 0) {
 508                 int delegation_flags = 0;
 509
 510                 rcu_read_lock();
 511                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 512                 if (delegation)
 513                         delegation_flags = delegation->flags;
 514                 rcu_read_unlock();
 515                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 516                         nfs_inode_set_delegation(state->inode,
 517                                         data->owner->so_cred,
 518                                         &data->o_res);
 519                 else
 520                         nfs_inode_reclaim_delegation(state->inode,
 521                                         data->owner->so_cred,
 522                                         &data->o_res);
 523         }
 524         rcu_read_lock();
 525         delegation = rcu_dereference(NFS_I(inode)->delegation);
 526         if (delegation != NULL)
 527                 deleg_stateid = &delegation->stateid;
 528         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 529         rcu_read_unlock();
 530         iput(inode);
 531 out:
 532         return state;
 533 err_put_inode:
 534         iput(inode);
 535 err:
 536         return ERR_PTR(ret);
 537 }
 538
 539 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 540 {
 541         struct nfs_inode *nfsi = NFS_I(state->inode);
 542         struct nfs_open_context *ctx;
 543
 544         spin_lock(&state->inode->i_lock);
 545         list_for_each_entry(ctx, &nfsi->open_files, list) {
 546                 if (ctx->state != state)
 547                         continue;
 548                 get_nfs_open_context(ctx);
 549                 spin_unlock(&state->inode->i_lock);
 550                 return ctx;
 551         }
 552         spin_unlock(&state->inode->i_lock);
 553         return ERR_PTR(-ENOENT);
 554 }
 555
 556 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 557 {
 558         struct nfs4_opendata *opendata;
 559
 560         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 561         if (opendata == NULL)
 562                 return ERR_PTR(-ENOMEM);
 563         opendata->state = state;
 564         atomic_inc(&state->count);
 565         return opendata;
 566 }
 567
 568 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 569 {
 570         struct nfs4_state *newstate;
 571         int ret;
 572
 573         opendata->o_arg.open_flags = openflags;
 574         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 575         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 576         nfs4_init_opendata_res(opendata);
 577         ret = _nfs4_proc_open(opendata);
 578         if (ret != 0)
 579                 return ret;
 580         newstate = nfs4_opendata_to_nfs4_state(opendata);
 581         if (IS_ERR(newstate))
 582                 return PTR_ERR(newstate);
 583         nfs4_close_state(&opendata->path, newstate, openflags);
 584         *res = newstate;
 585         return 0;
 586 }
 587
 588 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 589 {
 590         struct nfs4_state *newstate;
 591         int ret;
 592
 593         /* memory barrier prior to reading state->n_* */
 594         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 595         smp_rmb();
 596         if (state->n_rdwr != 0) {
 597                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 598                 if (ret != 0)
 599                         return ret;
 600                 if (newstate != state)
 601                         return -ESTALE;
 602         }
 603         if (state->n_wronly != 0) {
 604                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 605                 if (ret != 0)
 606                         return ret;
 607                 if (newstate != state)
 608                         return -ESTALE;
 609         }
 610         if (state->n_rdonly != 0) {
 611                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 612                 if (ret != 0)
 613                         return ret;
 614                 if (newstate != state)
 615                         return -ESTALE;
 616         }
 617         /*
 618          * We may have performed cached opens for all three recoveries.
 619          * Check if we need to update the current stateid.
 620          */
 621         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 622             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 623                 write_seqlock(&state->seqlock);
 624                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 625                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 626                 write_sequnlock(&state->seqlock);
 627         }
 628         return 0;
 629 }
 630
 631 /*
 632  * OPEN_RECLAIM:
 633  *      reclaim state on the server after a reboot.
 634  */
 635 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 636 {
 637         struct nfs_delegation *delegation;
 638         struct nfs4_opendata *opendata;
 639         int delegation_type = 0;
 640         int status;
 641
 642         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 643         if (IS_ERR(opendata))
 644                 return PTR_ERR(opendata);
 645         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 646         opendata->o_arg.fh = NFS_FH(state->inode);
 647         rcu_read_lock();
 648         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 649         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 650                 delegation_type = delegation->type;
 651         rcu_read_unlock();
 652         opendata->o_arg.u.delegation_type = delegation_type;
 653         status = nfs4_open_recover(opendata, state);
 654         nfs4_opendata_put(opendata);
 655         return status;
 656 }
 657
 658 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 659 {
 660         struct nfs_server *server = NFS_SERVER(state->inode);
 661         struct nfs4_exception exception = { };
 662         int err;
 663         do {
 664                 err = _nfs4_do_open_reclaim(ctx, state);
 665                 if (err != -NFS4ERR_DELAY)
 666                         break;
 667                 nfs4_handle_exception(server, err, &exception);
 668         } while (exception.retry);
 669         return err;
 670 }
 671
 672 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 673 {
 674         struct nfs_open_context *ctx;
 675         int ret;
 676
 677         ctx = nfs4_state_find_open_context(state);
 678         if (IS_ERR(ctx))
 679                 return PTR_ERR(ctx);
 680         ret = nfs4_do_open_reclaim(ctx, state);
 681         put_nfs_open_context(ctx);
 682         return ret;
 683 }
 684
 685 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 686 {
 687         struct nfs4_opendata *opendata;
 688         int ret;
 689
 690         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 691         if (IS_ERR(opendata))
 692                 return PTR_ERR(opendata);
 693         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 694         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 695                         sizeof(opendata->o_arg.u.delegation.data));
 696         ret = nfs4_open_recover(opendata, state);
 697         nfs4_opendata_put(opendata);
 698         return ret;
 699 }
 700
 701 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 702 {
 703         struct nfs4_exception exception = { };
 704         struct nfs_server *server = NFS_SERVER(state->inode);
 705         int err;
 706         do {
 707                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 708                 switch (err) {
 709                         case 0:
 710                                 return err;
 711                         case -NFS4ERR_STALE_CLIENTID:
 712                         case -NFS4ERR_STALE_STATEID:
 713                         case -NFS4ERR_EXPIRED:
 714                                 /* Don't recall a delegation if it was lost */
 715                                 nfs4_schedule_state_recovery(server->nfs_client);
 716                                 return err;
 717                 }
 718                 err = nfs4_handle_exception(server, err, &exception);
 719         } while (exception.retry);
 720         return err;
 721 }
 722
 723 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 724 {
 725         struct nfs4_opendata *data = calldata;
 726         struct  rpc_message msg = {
 727                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 728                 .rpc_argp = &data->c_arg,
 729                 .rpc_resp = &data->c_res,
 730                 .rpc_cred = data->owner->so_cred,
 731         };
 732         data->timestamp = jiffies;
 733         rpc_call_setup(task, &msg, 0);
 734 }
 735
 736 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 737 {
 738         struct nfs4_opendata *data = calldata;
 739
 740         data->rpc_status = task->tk_status;
 741         if (RPC_ASSASSINATED(task))
 742                 return;
 743         if (data->rpc_status == 0) {
 744                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 745                                 sizeof(data->o_res.stateid.data));
 746                 renew_lease(data->o_res.server, data->timestamp);
 747                 data->rpc_done = 1;
 748         }
 749         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 750         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 751 }
 752
 753 static void nfs4_open_confirm_release(void *calldata)
 754 {
 755         struct nfs4_opendata *data = calldata;
 756         struct nfs4_state *state = NULL;
 757
 758         /* If this request hasn't been cancelled, do nothing */
 759         if (data->cancelled == 0)
 760                 goto out_free;
 761         /* In case of error, no cleanup! */
 762         if (!data->rpc_done)
 763                 goto out_free;
 764         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 765         state = nfs4_opendata_to_nfs4_state(data);
 766         if (!IS_ERR(state))
 767                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 768 out_free:
 769         nfs4_opendata_put(data);
 770 }
 771
 772 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 773         .rpc_call_prepare = nfs4_open_confirm_prepare,
 774         .rpc_call_done = nfs4_open_confirm_done,
 775         .rpc_release = nfs4_open_confirm_release,
 776 };
 777
 778 /*
 779  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 780  */
 781 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 782 {
 783         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 784         struct rpc_task *task;
 785         int status;
 786
 787         kref_get(&data->kref);
 788         data->rpc_done = 0;
 789         data->rpc_status = 0;
 790         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 791         if (IS_ERR(task))
 792                 return PTR_ERR(task);
 793         status = nfs4_wait_for_completion_rpc_task(task);
 794         if (status != 0) {
 795                 data->cancelled = 1;
 796                 smp_wmb();
 797         } else
 798                 status = data->rpc_status;
 799         rpc_put_task(task);
 800         return status;
 801 }
 802
 803 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 804 {
 805         struct nfs4_opendata *data = calldata;
 806         struct nfs4_state_owner *sp = data->owner;
 807         struct rpc_message msg = {
 808                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 809                 .rpc_argp = &data->o_arg,
 810                 .rpc_resp = &data->o_res,
 811                 .rpc_cred = sp->so_cred,
 812         };
 813
 814         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 815                 return;
 816         /*
 817          * Check if we still need to send an OPEN call, or if we can use
 818          * a delegation instead.
 819          */
 820         if (data->state != NULL) {
 821                 struct nfs_delegation *delegation;
 822
 823                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 824                         goto out_no_action;
 825                 rcu_read_lock();
 826                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 827                 if (delegation != NULL &&
 828                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 829                         rcu_read_unlock();
 830                         goto out_no_action;
 831                 }
 832                 rcu_read_unlock();
 833         }
 834         /* Update sequence id. */
 835         data->o_arg.id = sp->so_owner_id.id;
 836         data->o_arg.clientid = sp->so_client->cl_clientid;
 837         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 838                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 839                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 840         }
 841         data->timestamp = jiffies;
 842         rpc_call_setup(task, &msg, 0);
 843         return;
 844 out_no_action:
 845         task->tk_action = NULL;
 846
 847 }
 848
 849 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 850 {
 851         struct nfs4_opendata *data = calldata;
 852
 853         data->rpc_status = task->tk_status;
 854         if (RPC_ASSASSINATED(task))
 855                 return;
 856         if (task->tk_status == 0) {
 857                 switch (data->o_res.f_attr->mode & S_IFMT) {
 858                         case S_IFREG:
 859                                 break;
 860                         case S_IFLNK:
 861                                 data->rpc_status = -ELOOP;
 862                                 break;
 863                         case S_IFDIR:
 864                                 data->rpc_status = -EISDIR;
 865                                 break;
 866                         default:
 867                                 data->rpc_status = -ENOTDIR;
 868                 }
 869                 renew_lease(data->o_res.server, data->timestamp);
 870                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 871                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 872         }
 873         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 874         data->rpc_done = 1;
 875 }
 876
 877 static void nfs4_open_release(void *calldata)
 878 {
 879         struct nfs4_opendata *data = calldata;
 880         struct nfs4_state *state = NULL;
 881
 882         /* If this request hasn't been cancelled, do nothing */
 883         if (data->cancelled == 0)
 884                 goto out_free;
 885         /* In case of error, no cleanup! */
 886         if (data->rpc_status != 0 || !data->rpc_done)
 887                 goto out_free;
 888         /* In case we need an open_confirm, no cleanup! */
 889         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 890                 goto out_free;
 891         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 892         state = nfs4_opendata_to_nfs4_state(data);
 893         if (!IS_ERR(state))
 894                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 895 out_free:
 896         nfs4_opendata_put(data);
 897 }
 898
 899 static const struct rpc_call_ops nfs4_open_ops = {
 900         .rpc_call_prepare = nfs4_open_prepare,
 901         .rpc_call_done = nfs4_open_done,
 902         .rpc_release = nfs4_open_release,
 903 };
 904
 905 /*
 906  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 907  */
 908 static int _nfs4_proc_open(struct nfs4_opendata *data)
 909 {
 910         struct inode *dir = data->dir->d_inode;
 911         struct nfs_server *server = NFS_SERVER(dir);
 912         struct nfs_openargs *o_arg = &data->o_arg;
 913         struct nfs_openres *o_res = &data->o_res;
 914         struct rpc_task *task;
 915         int status;
 916
 917         kref_get(&data->kref);
 918         data->rpc_done = 0;
 919         data->rpc_status = 0;
 920         data->cancelled = 0;
 921         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 922         if (IS_ERR(task))
 923                 return PTR_ERR(task);
 924         status = nfs4_wait_for_completion_rpc_task(task);
 925         if (status != 0) {
 926                 data->cancelled = 1;
 927                 smp_wmb();
 928         } else
 929                 status = data->rpc_status;
 930         rpc_put_task(task);
 931         if (status != 0 || !data->rpc_done)
 932                 return status;
 933
 934         if (o_res->fh.size == 0)
 935                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 936
 937         if (o_arg->open_flags & O_CREAT) {
 938                 update_changeattr(dir, &o_res->cinfo);
 939                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 940         } else
 941                 nfs_refresh_inode(dir, o_res->dir_attr);
 942         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 943                 status = _nfs4_proc_open_confirm(data);
 944                 if (status != 0)
 945                         return status;
 946         }
 947         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 948                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 949         return 0;
 950 }
 951
 952 static int nfs4_recover_expired_lease(struct nfs_server *server)
 953 {
 954         struct nfs_client *clp = server->nfs_client;
 955         int ret;
 956
 957         for (;;) {
 958                 ret = nfs4_wait_clnt_recover(server->client, clp);
 959                 if (ret != 0)
 960                         return ret;
 961                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 962                         break;
 963                 nfs4_schedule_state_recovery(clp);
 964         }
 965         return 0;
 966 }
 967
 968 /*
 969  * OPEN_EXPIRED:
 970  *      reclaim state on the server after a network partition.
 971  *      Assumes caller holds the appropriate lock
 972  */
 973 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 974 {
 975         struct nfs4_opendata *opendata;
 976         int ret;
 977
 978         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 979         if (IS_ERR(opendata))
 980                 return PTR_ERR(opendata);
 981         ret = nfs4_open_recover(opendata, state);
 982         if (ret == -ESTALE) {
 983                 /* Invalidate the state owner so we don't ever use it again */
 984                 nfs4_drop_state_owner(state->owner);
 985                 d_drop(ctx->path.dentry);
 986         }
 987         nfs4_opendata_put(opendata);
 988         return ret;
 989 }
 990
 991 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 992 {
 993         struct nfs_server *server = NFS_SERVER(state->inode);
 994         struct nfs4_exception exception = { };
 995         int err;
 996
 997         do {
 998                 err = _nfs4_open_expired(ctx, state);
 999                 if (err == -NFS4ERR_DELAY)
1000                         nfs4_handle_exception(server, err, &exception);
1001         } while (exception.retry);
1002         return err;
1003 }
1004
1005 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1006 {
1007         struct nfs_open_context *ctx;
1008         int ret;
1009
1010         ctx = nfs4_state_find_open_context(state);
1011         if (IS_ERR(ctx))
1012                 return PTR_ERR(ctx);
1013         ret = nfs4_do_open_expired(ctx, state);
1014         put_nfs_open_context(ctx);
1015         return ret;
1016 }
1017
1018 /*
1019  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1020  * fields corresponding to attributes that were used to store the verifier.
1021  * Make sure we clobber those fields in the later setattr call
1022  */
1023 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1024 {
1025         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1026             !(sattr->ia_valid & ATTR_ATIME_SET))
1027                 sattr->ia_valid |= ATTR_ATIME;
1028
1029         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1030             !(sattr->ia_valid & ATTR_MTIME_SET))
1031                 sattr->ia_valid |= ATTR_MTIME;
1032 }
1033
1034 /*
1035  * Returns a referenced nfs4_state
1036  */
1037 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1038 {
1039         struct nfs4_state_owner  *sp;
1040         struct nfs4_state     *state = NULL;
1041         struct nfs_server       *server = NFS_SERVER(dir);
1042         struct nfs_client *clp = server->nfs_client;
1043         struct nfs4_opendata *opendata;
1044         int status;
1045
1046         /* Protect against reboot recovery conflicts */
1047         status = -ENOMEM;
1048         if (!(sp = nfs4_get_state_owner(server, cred))) {
1049                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1050                 goto out_err;
1051         }
1052         status = nfs4_recover_expired_lease(server);
1053         if (status != 0)
1054                 goto err_put_state_owner;
1055         if (path->dentry->d_inode != NULL)
1056                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1057         down_read(&clp->cl_sem);
1058         status = -ENOMEM;
1059         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1060         if (opendata == NULL)
1061                 goto err_release_rwsem;
1062
1063         if (path->dentry->d_inode != NULL)
1064                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1065
1066         status = _nfs4_proc_open(opendata);
1067         if (status != 0)
1068                 goto err_opendata_put;
1069
1070         if (opendata->o_arg.open_flags & O_EXCL)
1071                 nfs4_exclusive_attrset(opendata, sattr);
1072
1073         state = nfs4_opendata_to_nfs4_state(opendata);
1074         status = PTR_ERR(state);
1075         if (IS_ERR(state))
1076                 goto err_opendata_put;
1077         nfs4_opendata_put(opendata);
1078         nfs4_put_state_owner(sp);
1079         up_read(&clp->cl_sem);
1080         *res = state;
1081         return 0;
1082 err_opendata_put:
1083         nfs4_opendata_put(opendata);
1084 err_release_rwsem:
1085         up_read(&clp->cl_sem);
1086 err_put_state_owner:
1087         nfs4_put_state_owner(sp);
1088 out_err:
1089         *res = NULL;
1090         return status;
1091 }
1092
1093
1094 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1095 {
1096         struct nfs4_exception exception = { };
1097         struct nfs4_state *res;
1098         int status;
1099
1100         do {
1101                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1102                 if (status == 0)
1103                         break;
1104                 /* NOTE: BAD_SEQID means the server and client disagree about the
1105                  * book-keeping w.r.t. state-changing operations
1106                  * (OPEN/CLOSE/LOCK/LOCKU...)
1107                  * It is actually a sign of a bug on the client or on the server.
1108                  *
1109                  * If we receive a BAD_SEQID error in the particular case of
1110                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1111                  * have unhashed the old state_owner for us, and that we can
1112                  * therefore safely retry using a new one. We should still warn
1113                  * the user though...
1114                  */
1115                 if (status == -NFS4ERR_BAD_SEQID) {
1116                         printk(KERN_WARNING "NFS: v4 server %s "
1117                                         " returned a bad sequence-id error!\n",
1118                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1119                         exception.retry = 1;
1120                         continue;
1121                 }
1122                 /*
1123                  * BAD_STATEID on OPEN means that the server cancelled our
1124                  * state before it received the OPEN_CONFIRM.
1125                  * Recover by retrying the request as per the discussion
1126                  * on Page 181 of RFC3530.
1127                  */
1128                 if (status == -NFS4ERR_BAD_STATEID) {
1129                         exception.retry = 1;
1130                         continue;
1131                 }
1132                 if (status == -EAGAIN) {
1133                         /* We must have found a delegation */
1134                         exception.retry = 1;
1135                         continue;
1136                 }
1137                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1138                                         status, &exception));
1139         } while (exception.retry);
1140         return res;
1141 }
1142
1143 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1144                 struct iattr *sattr, struct nfs4_state *state)
1145 {
1146         struct nfs_server *server = NFS_SERVER(inode);
1147         struct nfs_setattrargs  arg = {
1148                 .fh             = NFS_FH(inode),
1149                 .iap            = sattr,
1150                 .server         = server,
1151                 .bitmask = server->attr_bitmask,
1152         };
1153         struct nfs_setattrres  res = {
1154                 .fattr          = fattr,
1155                 .server         = server,
1156         };
1157         struct rpc_message msg = {
1158                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1159                 .rpc_argp       = &arg,
1160                 .rpc_resp       = &res,
1161         };
1162         unsigned long timestamp = jiffies;
1163         int status;
1164
1165         nfs_fattr_init(fattr);
1166
1167         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1168                 /* Use that stateid */
1169         } else if (state != NULL) {
1170                 msg.rpc_cred = state->owner->so_cred;
1171                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1172         } else
1173                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1174
1175         status = rpc_call_sync(server->client, &msg, 0);
1176         if (status == 0 && state != NULL)
1177                 renew_lease(server, timestamp);
1178         return status;
1179 }
1180
1181 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1182                 struct iattr *sattr, struct nfs4_state *state)
1183 {
1184         struct nfs_server *server = NFS_SERVER(inode);
1185         struct nfs4_exception exception = { };
1186         int err;
1187         do {
1188                 err = nfs4_handle_exception(server,
1189                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1190                                 &exception);
1191         } while (exception.retry);
1192         return err;
1193 }
1194
1195 struct nfs4_closedata {
1196         struct path path;
1197         struct inode *inode;
1198         struct nfs4_state *state;
1199         struct nfs_closeargs arg;
1200         struct nfs_closeres res;
1201         struct nfs_fattr fattr;
1202         unsigned long timestamp;
1203 };
1204
1205 static void nfs4_free_closedata(void *data)
1206 {
1207         struct nfs4_closedata *calldata = data;
1208         struct nfs4_state_owner *sp = calldata->state->owner;
1209
1210         nfs4_put_open_state(calldata->state);
1211         nfs_free_seqid(calldata->arg.seqid);
1212         nfs4_put_state_owner(sp);
1213         dput(calldata->path.dentry);
1214         mntput(calldata->path.mnt);
1215         kfree(calldata);
1216 }
1217
1218 static void nfs4_close_done(struct rpc_task *task, void *data)
1219 {
1220         struct nfs4_closedata *calldata = data;
1221         struct nfs4_state *state = calldata->state;
1222         struct nfs_server *server = NFS_SERVER(calldata->inode);
1223
1224         if (RPC_ASSASSINATED(task))
1225                 return;
1226         /* hmm. we are done with the inode, and in the process of freeing
1227          * the state_owner. we keep this around to process errors
1228          */
1229         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1230         switch (task->tk_status) {
1231                 case 0:
1232                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1233                         renew_lease(server, calldata->timestamp);
1234                         break;
1235                 case -NFS4ERR_STALE_STATEID:
1236                 case -NFS4ERR_EXPIRED:
1237                         break;
1238                 default:
1239                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1240                                 rpc_restart_call(task);
1241                                 return;
1242                         }
1243         }
1244         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1245 }
1246
1247 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1248 {
1249         struct nfs4_closedata *calldata = data;
1250         struct nfs4_state *state = calldata->state;
1251         struct rpc_message msg = {
1252                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1253                 .rpc_argp = &calldata->arg,
1254                 .rpc_resp = &calldata->res,
1255                 .rpc_cred = state->owner->so_cred,
1256         };
1257         int clear_rd, clear_wr, clear_rdwr;
1258
1259         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1260                 return;
1261
1262         clear_rd = clear_wr = clear_rdwr = 0;
1263         spin_lock(&state->owner->so_lock);
1264         /* Calculate the change in open mode */
1265         if (state->n_rdwr == 0) {
1266                 if (state->n_rdonly == 0) {
1267                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1268                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1269                 }
1270                 if (state->n_wronly == 0) {
1271                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1272                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1273                 }
1274         }
1275         spin_unlock(&state->owner->so_lock);
1276         if (!clear_rd && !clear_wr && !clear_rdwr) {
1277                 /* Note: exit _without_ calling nfs4_close_done */
1278                 task->tk_action = NULL;
1279                 return;
1280         }
1281         nfs_fattr_init(calldata->res.fattr);
1282         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1283                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1284                 calldata->arg.open_flags = FMODE_READ;
1285         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1286                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1287                 calldata->arg.open_flags = FMODE_WRITE;
1288         }
1289         calldata->timestamp = jiffies;
1290         rpc_call_setup(task, &msg, 0);
1291 }
1292
1293 static const struct rpc_call_ops nfs4_close_ops = {
1294         .rpc_call_prepare = nfs4_close_prepare,
1295         .rpc_call_done = nfs4_close_done,
1296         .rpc_release = nfs4_free_closedata,
1297 };
1298
1299 /*
1300  * It is possible for data to be read/written from a mem-mapped file
1301  * after the sys_close call (which hits the vfs layer as a flush).
1302  * This means that we can't safely call nfsv4 close on a file until
1303  * the inode is cleared. This in turn means that we are not good
1304  * NFSv4 citizens - we do not indicate to the server to update the file's
1305  * share state even when we are done with one of the three share
1306  * stateid's in the inode.
1307  *
1308  * NOTE: Caller must be holding the sp->so_owner semaphore!
1309  */
1310 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1311 {
1312         struct nfs_server *server = NFS_SERVER(state->inode);
1313         struct nfs4_closedata *calldata;
1314         struct nfs4_state_owner *sp = state->owner;
1315         struct rpc_task *task;
1316         int status = -ENOMEM;
1317
1318         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1319         if (calldata == NULL)
1320                 goto out;
1321         calldata->inode = state->inode;
1322         calldata->state = state;
1323         calldata->arg.fh = NFS_FH(state->inode);
1324         calldata->arg.stateid = &state->open_stateid;
1325         /* Serialization for the sequence id */
1326         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1327         if (calldata->arg.seqid == NULL)
1328                 goto out_free_calldata;
1329         calldata->arg.bitmask = server->attr_bitmask;
1330         calldata->res.fattr = &calldata->fattr;
1331         calldata->res.server = server;
1332         calldata->path.mnt = mntget(path->mnt);
1333         calldata->path.dentry = dget(path->dentry);
1334
1335         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1336         if (IS_ERR(task))
1337                 return PTR_ERR(task);
1338         rpc_put_task(task);
1339         return 0;
1340 out_free_calldata:
1341         kfree(calldata);
1342 out:
1343         nfs4_put_open_state(state);
1344         nfs4_put_state_owner(sp);
1345         return status;
1346 }
1347
1348 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1349 {
1350         struct file *filp;
1351         int ret;
1352
1353         /* If the open_intent is for execute, we have an extra check to make */
1354         if (nd->intent.open.flags & FMODE_EXEC) {
1355                 ret = nfs_may_open(state->inode,
1356                                 state->owner->so_cred,
1357                                 nd->intent.open.flags);
1358                 if (ret < 0)
1359                         goto out_close;
1360         }
1361         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1362         if (!IS_ERR(filp)) {
1363                 struct nfs_open_context *ctx;
1364                 ctx = nfs_file_open_context(filp);
1365                 ctx->state = state;
1366                 return 0;
1367         }
1368         ret = PTR_ERR(filp);
1369 out_close:
1370         nfs4_close_state(path, state, nd->intent.open.flags);
1371         return ret;
1372 }
1373
1374 struct dentry *
1375 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1376 {
1377         struct path path = {
1378                 .mnt = nd->mnt,
1379                 .dentry = dentry,
1380         };
1381         struct iattr attr;
1382         struct rpc_cred *cred;
1383         struct nfs4_state *state;
1384         struct dentry *res;
1385
1386         if (nd->flags & LOOKUP_CREATE) {
1387                 attr.ia_mode = nd->intent.open.create_mode;
1388                 attr.ia_valid = ATTR_MODE;
1389                 if (!IS_POSIXACL(dir))
1390                         attr.ia_mode &= ~current->fs->umask;
1391         } else {
1392                 attr.ia_valid = 0;
1393                 BUG_ON(nd->intent.open.flags & O_CREAT);
1394         }
1395
1396         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1397         if (IS_ERR(cred))
1398                 return (struct dentry *)cred;
1399         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1400         put_rpccred(cred);
1401         if (IS_ERR(state)) {
1402                 if (PTR_ERR(state) == -ENOENT)
1403                         d_add(dentry, NULL);
1404                 return (struct dentry *)state;
1405         }
1406         res = d_add_unique(dentry, igrab(state->inode));
1407         if (res != NULL)
1408                 path.dentry = res;
1409         nfs4_intent_set_file(nd, &path, state);
1410         return res;
1411 }
1412
1413 int
1414 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1415 {
1416         struct path path = {
1417                 .mnt = nd->mnt,
1418                 .dentry = dentry,
1419         };
1420         struct rpc_cred *cred;
1421         struct nfs4_state *state;
1422
1423         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1424         if (IS_ERR(cred))
1425                 return PTR_ERR(cred);
1426         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1427         put_rpccred(cred);
1428         if (IS_ERR(state)) {
1429                 switch (PTR_ERR(state)) {
1430                         case -EPERM:
1431                         case -EACCES:
1432                         case -EDQUOT:
1433                         case -ENOSPC:
1434                         case -EROFS:
1435                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1436                                 return 1;
1437                         default:
1438                                 goto out_drop;
1439                 }
1440         }
1441         if (state->inode == dentry->d_inode) {
1442                 nfs4_intent_set_file(nd, &path, state);
1443                 return 1;
1444         }
1445         nfs4_close_state(&path, state, openflags);
1446 out_drop:
1447         d_drop(dentry);
1448         return 0;
1449 }
1450
1451
1452 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1453 {
1454         struct nfs4_server_caps_res res = {};
1455         struct rpc_message msg = {
1456                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1457                 .rpc_argp = fhandle,
1458                 .rpc_resp = &res,
1459         };
1460         int status;
1461
1462         status = rpc_call_sync(server->client, &msg, 0);
1463         if (status == 0) {
1464                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1465                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1466                         server->caps |= NFS_CAP_ACLS;
1467                 if (res.has_links != 0)
1468                         server->caps |= NFS_CAP_HARDLINKS;
1469                 if (res.has_symlinks != 0)
1470                         server->caps |= NFS_CAP_SYMLINKS;
1471                 server->acl_bitmask = res.acl_bitmask;
1472         }
1473         return status;
1474 }
1475
1476 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1477 {
1478         struct nfs4_exception exception = { };
1479         int err;
1480         do {
1481                 err = nfs4_handle_exception(server,
1482                                 _nfs4_server_capabilities(server, fhandle),
1483                                 &exception);
1484         } while (exception.retry);
1485         return err;
1486 }
1487
1488 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1489                 struct nfs_fsinfo *info)
1490 {
1491         struct nfs4_lookup_root_arg args = {
1492                 .bitmask = nfs4_fattr_bitmap,
1493         };
1494         struct nfs4_lookup_res res = {
1495                 .server = server,
1496                 .fattr = info->fattr,
1497                 .fh = fhandle,
1498         };
1499         struct rpc_message msg = {
1500                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1501                 .rpc_argp = &args,
1502                 .rpc_resp = &res,
1503         };
1504         nfs_fattr_init(info->fattr);
1505         return rpc_call_sync(server->client, &msg, 0);
1506 }
1507
1508 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1509                 struct nfs_fsinfo *info)
1510 {
1511         struct nfs4_exception exception = { };
1512         int err;
1513         do {
1514                 err = nfs4_handle_exception(server,
1515                                 _nfs4_lookup_root(server, fhandle, info),
1516                                 &exception);
1517         } while (exception.retry);
1518         return err;
1519 }
1520
1521 /*
1522  * get the file handle for the "/" directory on the server
1523  */
1524 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1525                               struct nfs_fsinfo *info)
1526 {
1527         int status;
1528
1529         status = nfs4_lookup_root(server, fhandle, info);
1530         if (status == 0)
1531                 status = nfs4_server_capabilities(server, fhandle);
1532         if (status == 0)
1533                 status = nfs4_do_fsinfo(server, fhandle, info);
1534         return nfs4_map_errors(status);
1535 }
1536
1537 /*
1538  * Get locations and (maybe) other attributes of a referral.
1539  * Note that we'll actually follow the referral later when
1540  * we detect fsid mismatch in inode revalidation
1541  */
1542 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1543 {
1544         int status = -ENOMEM;
1545         struct page *page = NULL;
1546         struct nfs4_fs_locations *locations = NULL;
1547
1548         page = alloc_page(GFP_KERNEL);
1549         if (page == NULL)
1550                 goto out;
1551         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1552         if (locations == NULL)
1553                 goto out;
1554
1555         status = nfs4_proc_fs_locations(dir, name, locations, page);
1556         if (status != 0)
1557                 goto out;
1558         /* Make sure server returned a different fsid for the referral */
1559         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1560                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1561                 status = -EIO;
1562                 goto out;
1563         }
1564
1565         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1566         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1567         if (!fattr->mode)
1568                 fattr->mode = S_IFDIR;
1569         memset(fhandle, 0, sizeof(struct nfs_fh));
1570 out:
1571         if (page)
1572                 __free_page(page);
1573         if (locations)
1574                 kfree(locations);
1575         return status;
1576 }
1577
1578 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1579 {
1580         struct nfs4_getattr_arg args = {
1581                 .fh = fhandle,
1582                 .bitmask = server->attr_bitmask,
1583         };
1584         struct nfs4_getattr_res res = {
1585                 .fattr = fattr,
1586                 .server = server,
1587         };
1588         struct rpc_message msg = {
1589                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1590                 .rpc_argp = &args,
1591                 .rpc_resp = &res,
1592         };
1593
1594         nfs_fattr_init(fattr);
1595         return rpc_call_sync(server->client, &msg, 0);
1596 }
1597
1598 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1599 {
1600         struct nfs4_exception exception = { };
1601         int err;
1602         do {
1603                 err = nfs4_handle_exception(server,
1604                                 _nfs4_proc_getattr(server, fhandle, fattr),
1605                                 &exception);
1606         } while (exception.retry);
1607         return err;
1608 }
1609
1610 /*
1611  * The file is not closed if it is opened due to the a request to change
1612  * the size of the file. The open call will not be needed once the
1613  * VFS layer lookup-intents are implemented.
1614  *
1615  * Close is called when the inode is destroyed.
1616  * If we haven't opened the file for O_WRONLY, we
1617  * need to in the size_change case to obtain a stateid.
1618  *
1619  * Got race?
1620  * Because OPEN is always done by name in nfsv4, it is
1621  * possible that we opened a different file by the same
1622  * name.  We can recognize this race condition, but we
1623  * can't do anything about it besides returning an error.
1624  *
1625  * This will be fixed with VFS changes (lookup-intent).
1626  */
1627 static int
1628 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1629                   struct iattr *sattr)
1630 {
1631         struct rpc_cred *cred;
1632         struct inode *inode = dentry->d_inode;
1633         struct nfs_open_context *ctx;
1634         struct nfs4_state *state = NULL;
1635         int status;
1636
1637         nfs_fattr_init(fattr);
1638
1639         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1640         if (IS_ERR(cred))
1641                 return PTR_ERR(cred);
1642
1643         /* Search for an existing open(O_WRITE) file */
1644         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1645         if (ctx != NULL)
1646                 state = ctx->state;
1647
1648         status = nfs4_do_setattr(inode, fattr, sattr, state);
1649         if (status == 0)
1650                 nfs_setattr_update_inode(inode, sattr);
1651         if (ctx != NULL)
1652                 put_nfs_open_context(ctx);
1653         put_rpccred(cred);
1654         return status;
1655 }
1656
1657 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1658                 const struct qstr *name, struct nfs_fh *fhandle,
1659                 struct nfs_fattr *fattr)
1660 {
1661         int                    status;
1662         struct nfs4_lookup_arg args = {
1663                 .bitmask = server->attr_bitmask,
1664                 .dir_fh = dirfh,
1665                 .name = name,
1666         };
1667         struct nfs4_lookup_res res = {
1668                 .server = server,
1669                 .fattr = fattr,
1670                 .fh = fhandle,
1671         };
1672         struct rpc_message msg = {
1673                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1674                 .rpc_argp = &args,
1675                 .rpc_resp = &res,
1676         };
1677
1678         nfs_fattr_init(fattr);
1679
1680         dprintk("NFS call  lookupfh %s\n", name->name);
1681         status = rpc_call_sync(server->client, &msg, 0);
1682         dprintk("NFS reply lookupfh: %d\n", status);
1683         return status;
1684 }
1685
1686 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1687                               struct qstr *name, struct nfs_fh *fhandle,
1688                               struct nfs_fattr *fattr)
1689 {
1690         struct nfs4_exception exception = { };
1691         int err;
1692         do {
1693                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1694                 /* FIXME: !!!! */
1695                 if (err == -NFS4ERR_MOVED) {
1696                         err = -EREMOTE;
1697                         break;
1698                 }
1699                 err = nfs4_handle_exception(server, err, &exception);
1700         } while (exception.retry);
1701         return err;
1702 }
1703
1704 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1705                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1706 {
1707         int status;
1708
1709         dprintk("NFS call  lookup %s\n", name->name);
1710         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1711         if (status == -NFS4ERR_MOVED)
1712                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1713         dprintk("NFS reply lookup: %d\n", status);
1714         return status;
1715 }
1716
1717 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1718 {
1719         struct nfs4_exception exception = { };
1720         int err;
1721         do {
1722                 err = nfs4_handle_exception(NFS_SERVER(dir),
1723                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1724                                 &exception);
1725         } while (exception.retry);
1726         return err;
1727 }
1728
1729 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1730 {
1731         struct nfs_server *server = NFS_SERVER(inode);
1732         struct nfs_fattr fattr;
1733         struct nfs4_accessargs args = {
1734                 .fh = NFS_FH(inode),
1735                 .bitmask = server->attr_bitmask,
1736         };
1737         struct nfs4_accessres res = {
1738                 .server = server,
1739                 .fattr = &fattr,
1740         };
1741         struct rpc_message msg = {
1742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1743                 .rpc_argp = &args,
1744                 .rpc_resp = &res,
1745                 .rpc_cred = entry->cred,
1746         };
1747         int mode = entry->mask;
1748         int status;
1749
1750         /*
1751          * Determine which access bits we want to ask for...
1752          */
1753         if (mode & MAY_READ)
1754                 args.access |= NFS4_ACCESS_READ;
1755         if (S_ISDIR(inode->i_mode)) {
1756                 if (mode & MAY_WRITE)
1757                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1758                 if (mode & MAY_EXEC)
1759                         args.access |= NFS4_ACCESS_LOOKUP;
1760         } else {
1761                 if (mode & MAY_WRITE)
1762                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1763                 if (mode & MAY_EXEC)
1764                         args.access |= NFS4_ACCESS_EXECUTE;
1765         }
1766         nfs_fattr_init(&fattr);
1767         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1768         if (!status) {
1769                 entry->mask = 0;
1770                 if (res.access & NFS4_ACCESS_READ)
1771                         entry->mask |= MAY_READ;
1772                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1773                         entry->mask |= MAY_WRITE;
1774                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1775                         entry->mask |= MAY_EXEC;
1776                 nfs_refresh_inode(inode, &fattr);
1777         }
1778         return status;
1779 }
1780
1781 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1782 {
1783         struct nfs4_exception exception = { };
1784         int err;
1785         do {
1786                 err = nfs4_handle_exception(NFS_SERVER(inode),
1787                                 _nfs4_proc_access(inode, entry),
1788                                 &exception);
1789         } while (exception.retry);
1790         return err;
1791 }
1792
1793 /*
1794  * TODO: For the time being, we don't try to get any attributes
1795  * along with any of the zero-copy operations READ, READDIR,
1796  * READLINK, WRITE.
1797  *
1798  * In the case of the first three, we want to put the GETATTR
1799  * after the read-type operation -- this is because it is hard
1800  * to predict the length of a GETATTR response in v4, and thus
1801  * align the READ data correctly.  This means that the GETATTR
1802  * may end up partially falling into the page cache, and we should
1803  * shift it into the 'tail' of the xdr_buf before processing.
1804  * To do this efficiently, we need to know the total length
1805  * of data received, which doesn't seem to be available outside
1806  * of the RPC layer.
1807  *
1808  * In the case of WRITE, we also want to put the GETATTR after
1809  * the operation -- in this case because we want to make sure
1810  * we get the post-operation mtime and size.  This means that
1811  * we can't use xdr_encode_pages() as written: we need a variant
1812  * of it which would leave room in the 'tail' iovec.
1813  *
1814  * Both of these changes to the XDR layer would in fact be quite
1815  * minor, but I decided to leave them for a subsequent patch.
1816  */
1817 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1818                 unsigned int pgbase, unsigned int pglen)
1819 {
1820         struct nfs4_readlink args = {
1821                 .fh       = NFS_FH(inode),
1822                 .pgbase   = pgbase,
1823                 .pglen    = pglen,
1824                 .pages    = &page,
1825         };
1826         struct rpc_message msg = {
1827                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1828                 .rpc_argp = &args,
1829                 .rpc_resp = NULL,
1830         };
1831
1832         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1833 }
1834
1835 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1836                 unsigned int pgbase, unsigned int pglen)
1837 {
1838         struct nfs4_exception exception = { };
1839         int err;
1840         do {
1841                 err = nfs4_handle_exception(NFS_SERVER(inode),
1842                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1843                                 &exception);
1844         } while (exception.retry);
1845         return err;
1846 }
1847
1848 /*
1849  * Got race?
1850  * We will need to arrange for the VFS layer to provide an atomic open.
1851  * Until then, this create/open method is prone to inefficiency and race
1852  * conditions due to the lookup, create, and open VFS calls from sys_open()
1853  * placed on the wire.
1854  *
1855  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1856  * The file will be opened again in the subsequent VFS open call
1857  * (nfs4_proc_file_open).
1858  *
1859  * The open for read will just hang around to be used by any process that
1860  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1861  */
1862
1863 static int
1864 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1865                  int flags, struct nameidata *nd)
1866 {
1867         struct path path = {
1868                 .mnt = nd->mnt,
1869                 .dentry = dentry,
1870         };
1871         struct nfs4_state *state;
1872         struct rpc_cred *cred;
1873         int status = 0;
1874
1875         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1876         if (IS_ERR(cred)) {
1877                 status = PTR_ERR(cred);
1878                 goto out;
1879         }
1880         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1881         put_rpccred(cred);
1882         if (IS_ERR(state)) {
1883                 status = PTR_ERR(state);
1884                 goto out;
1885         }
1886         d_instantiate(dentry, igrab(state->inode));
1887         if (flags & O_EXCL) {
1888                 struct nfs_fattr fattr;
1889                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1890                 if (status == 0)
1891                         nfs_setattr_update_inode(state->inode, sattr);
1892                 nfs_post_op_update_inode(state->inode, &fattr);
1893         }
1894         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1895                 status = nfs4_intent_set_file(nd, &path, state);
1896         else
1897                 nfs4_close_state(&path, state, flags);
1898 out:
1899         return status;
1900 }
1901
1902 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1903 {
1904         struct nfs_server *server = NFS_SERVER(dir);
1905         struct nfs_removeargs args = {
1906                 .fh = NFS_FH(dir),
1907                 .name.len = name->len,
1908                 .name.name = name->name,
1909                 .bitmask = server->attr_bitmask,
1910         };
1911         struct nfs_removeres res = {
1912                 .server = server,
1913         };
1914         struct rpc_message msg = {
1915                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1916                 .rpc_argp = &args,
1917                 .rpc_resp = &res,
1918         };
1919         int                     status;
1920
1921         nfs_fattr_init(&res.dir_attr);
1922         status = rpc_call_sync(server->client, &msg, 0);
1923         if (status == 0) {
1924                 update_changeattr(dir, &res.cinfo);
1925                 nfs_post_op_update_inode(dir, &res.dir_attr);
1926         }
1927         return status;
1928 }
1929
1930 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1931 {
1932         struct nfs4_exception exception = { };
1933         int err;
1934         do {
1935                 err = nfs4_handle_exception(NFS_SERVER(dir),
1936                                 _nfs4_proc_remove(dir, name),
1937                                 &exception);
1938         } while (exception.retry);
1939         return err;
1940 }
1941
1942 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1943 {
1944         struct nfs_server *server = NFS_SERVER(dir);
1945         struct nfs_removeargs *args = msg->rpc_argp;
1946         struct nfs_removeres *res = msg->rpc_resp;
1947
1948         args->bitmask = server->attr_bitmask;
1949         res->server = server;
1950         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1951 }
1952
1953 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1954 {
1955         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1956
1957         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1958                 return 0;
1959         update_changeattr(dir, &res->cinfo);
1960         nfs_post_op_update_inode(dir, &res->dir_attr);
1961         return 1;
1962 }
1963
1964 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1965                 struct inode *new_dir, struct qstr *new_name)
1966 {
1967         struct nfs_server *server = NFS_SERVER(old_dir);
1968         struct nfs4_rename_arg arg = {
1969                 .old_dir = NFS_FH(old_dir),
1970                 .new_dir = NFS_FH(new_dir),
1971                 .old_name = old_name,
1972                 .new_name = new_name,
1973                 .bitmask = server->attr_bitmask,
1974         };
1975         struct nfs_fattr old_fattr, new_fattr;
1976         struct nfs4_rename_res res = {
1977                 .server = server,
1978                 .old_fattr = &old_fattr,
1979                 .new_fattr = &new_fattr,
1980         };
1981         struct rpc_message msg = {
1982                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1983                 .rpc_argp = &arg,
1984                 .rpc_resp = &res,
1985         };
1986         int                     status;
1987
1988         nfs_fattr_init(res.old_fattr);
1989         nfs_fattr_init(res.new_fattr);
1990         status = rpc_call_sync(server->client, &msg, 0);
1991
1992         if (!status) {
1993                 update_changeattr(old_dir, &res.old_cinfo);
1994                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1995                 update_changeattr(new_dir, &res.new_cinfo);
1996                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1997         }
1998         return status;
1999 }
2000
2001 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2002                 struct inode *new_dir, struct qstr *new_name)
2003 {
2004         struct nfs4_exception exception = { };
2005         int err;
2006         do {
2007                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2008                                 _nfs4_proc_rename(old_dir, old_name,
2009                                         new_dir, new_name),
2010                                 &exception);
2011         } while (exception.retry);
2012         return err;
2013 }
2014
2015 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2016 {
2017         struct nfs_server *server = NFS_SERVER(inode);
2018         struct nfs4_link_arg arg = {
2019                 .fh     = NFS_FH(inode),
2020                 .dir_fh = NFS_FH(dir),
2021                 .name   = name,
2022                 .bitmask = server->attr_bitmask,
2023         };
2024         struct nfs_fattr fattr, dir_attr;
2025         struct nfs4_link_res res = {
2026                 .server = server,
2027                 .fattr = &fattr,
2028                 .dir_attr = &dir_attr,
2029         };
2030         struct rpc_message msg = {
2031                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2032                 .rpc_argp = &arg,
2033                 .rpc_resp = &res,
2034         };
2035         int                     status;
2036
2037         nfs_fattr_init(res.fattr);
2038         nfs_fattr_init(res.dir_attr);
2039         status = rpc_call_sync(server->client, &msg, 0);
2040         if (!status) {
2041                 update_changeattr(dir, &res.cinfo);
2042                 nfs_post_op_update_inode(dir, res.dir_attr);
2043                 nfs_post_op_update_inode(inode, res.fattr);
2044         }
2045
2046         return status;
2047 }
2048
2049 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2050 {
2051         struct nfs4_exception exception = { };
2052         int err;
2053         do {
2054                 err = nfs4_handle_exception(NFS_SERVER(inode),
2055                                 _nfs4_proc_link(inode, dir, name),
2056                                 &exception);
2057         } while (exception.retry);
2058         return err;
2059 }
2060
2061 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2062                 struct page *page, unsigned int len, struct iattr *sattr)
2063 {
2064         struct nfs_server *server = NFS_SERVER(dir);
2065         struct nfs_fh fhandle;
2066         struct nfs_fattr fattr, dir_fattr;
2067         struct nfs4_create_arg arg = {
2068                 .dir_fh = NFS_FH(dir),
2069                 .server = server,
2070                 .name = &dentry->d_name,
2071                 .attrs = sattr,
2072                 .ftype = NF4LNK,
2073                 .bitmask = server->attr_bitmask,
2074         };
2075         struct nfs4_create_res res = {
2076                 .server = server,
2077                 .fh = &fhandle,
2078                 .fattr = &fattr,
2079                 .dir_fattr = &dir_fattr,
2080         };
2081         struct rpc_message msg = {
2082                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2083                 .rpc_argp = &arg,
2084                 .rpc_resp = &res,
2085         };
2086         int                     status;
2087
2088         if (len > NFS4_MAXPATHLEN)
2089                 return -ENAMETOOLONG;
2090
2091         arg.u.symlink.pages = &page;
2092         arg.u.symlink.len = len;
2093         nfs_fattr_init(&fattr);
2094         nfs_fattr_init(&dir_fattr);
2095
2096         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2097         if (!status) {
2098                 update_changeattr(dir, &res.dir_cinfo);
2099                 nfs_post_op_update_inode(dir, res.dir_fattr);
2100                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2101         }
2102         return status;
2103 }
2104
2105 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2106                 struct page *page, unsigned int len, struct iattr *sattr)
2107 {
2108         struct nfs4_exception exception = { };
2109         int err;
2110         do {
2111                 err = nfs4_handle_exception(NFS_SERVER(dir),
2112                                 _nfs4_proc_symlink(dir, dentry, page,
2113                                                         len, sattr),
2114                                 &exception);
2115         } while (exception.retry);
2116         return err;
2117 }
2118
2119 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2120                 struct iattr *sattr)
2121 {
2122         struct nfs_server *server = NFS_SERVER(dir);
2123         struct nfs_fh fhandle;
2124         struct nfs_fattr fattr, dir_fattr;
2125         struct nfs4_create_arg arg = {
2126                 .dir_fh = NFS_FH(dir),
2127                 .server = server,
2128                 .name = &dentry->d_name,
2129                 .attrs = sattr,
2130                 .ftype = NF4DIR,
2131                 .bitmask = server->attr_bitmask,
2132         };
2133         struct nfs4_create_res res = {
2134                 .server = server,
2135                 .fh = &fhandle,
2136                 .fattr = &fattr,
2137                 .dir_fattr = &dir_fattr,
2138         };
2139         struct rpc_message msg = {
2140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2141                 .rpc_argp = &arg,
2142                 .rpc_resp = &res,
2143         };
2144         int                     status;
2145
2146         nfs_fattr_init(&fattr);
2147         nfs_fattr_init(&dir_fattr);
2148
2149         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2150         if (!status) {
2151                 update_changeattr(dir, &res.dir_cinfo);
2152                 nfs_post_op_update_inode(dir, res.dir_fattr);
2153                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2154         }
2155         return status;
2156 }
2157
2158 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2159                 struct iattr *sattr)
2160 {
2161         struct nfs4_exception exception = { };
2162         int err;
2163         do {
2164                 err = nfs4_handle_exception(NFS_SERVER(dir),
2165                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2166                                 &exception);
2167         } while (exception.retry);
2168         return err;
2169 }
2170
2171 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2172                   u64 cookie, struct page *page, unsigned int count, int plus)
2173 {
2174         struct inode            *dir = dentry->d_inode;
2175         struct nfs4_readdir_arg args = {
2176                 .fh = NFS_FH(dir),
2177                 .pages = &page,
2178                 .pgbase = 0,
2179                 .count = count,
2180                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2181         };
2182         struct nfs4_readdir_res res;
2183         struct rpc_message msg = {
2184                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2185                 .rpc_argp = &args,
2186                 .rpc_resp = &res,
2187                 .rpc_cred = cred,
2188         };
2189         int                     status;
2190
2191         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2192                         dentry->d_parent->d_name.name,
2193                         dentry->d_name.name,
2194                         (unsigned long long)cookie);
2195         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2196         res.pgbase = args.pgbase;
2197         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2198         if (status == 0)
2199                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2200
2201         nfs_invalidate_atime(dir);
2202
2203         dprintk("%s: returns %d\n", __FUNCTION__, status);
2204         return status;
2205 }
2206
2207 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2208                   u64 cookie, struct page *page, unsigned int count, int plus)
2209 {
2210         struct nfs4_exception exception = { };
2211         int err;
2212         do {
2213                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2214                                 _nfs4_proc_readdir(dentry, cred, cookie,
2215                                         page, count, plus),
2216                                 &exception);
2217         } while (exception.retry);
2218         return err;
2219 }
2220
2221 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2222                 struct iattr *sattr, dev_t rdev)
2223 {
2224         struct nfs_server *server = NFS_SERVER(dir);
2225         struct nfs_fh fh;
2226         struct nfs_fattr fattr, dir_fattr;
2227         struct nfs4_create_arg arg = {
2228                 .dir_fh = NFS_FH(dir),
2229                 .server = server,
2230                 .name = &dentry->d_name,
2231                 .attrs = sattr,
2232                 .bitmask = server->attr_bitmask,
2233         };
2234         struct nfs4_create_res res = {
2235                 .server = server,
2236                 .fh = &fh,
2237                 .fattr = &fattr,
2238                 .dir_fattr = &dir_fattr,
2239         };
2240         struct rpc_message msg = {
2241                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2242                 .rpc_argp = &arg,
2243                 .rpc_resp = &res,
2244         };
2245         int                     status;
2246         int                     mode = sattr->ia_mode;
2247
2248         nfs_fattr_init(&fattr);
2249         nfs_fattr_init(&dir_fattr);
2250
2251         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2252         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2253         if (S_ISFIFO(mode))
2254                 arg.ftype = NF4FIFO;
2255         else if (S_ISBLK(mode)) {
2256                 arg.ftype = NF4BLK;
2257                 arg.u.device.specdata1 = MAJOR(rdev);
2258                 arg.u.device.specdata2 = MINOR(rdev);
2259         }
2260         else if (S_ISCHR(mode)) {
2261                 arg.ftype = NF4CHR;
2262                 arg.u.device.specdata1 = MAJOR(rdev);
2263                 arg.u.device.specdata2 = MINOR(rdev);
2264         }
2265         else
2266                 arg.ftype = NF4SOCK;
2267
2268         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2269         if (status == 0) {
2270                 update_changeattr(dir, &res.dir_cinfo);
2271                 nfs_post_op_update_inode(dir, res.dir_fattr);
2272                 status = nfs_instantiate(dentry, &fh, &fattr);
2273         }
2274         return status;
2275 }
2276
2277 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2278                 struct iattr *sattr, dev_t rdev)
2279 {
2280         struct nfs4_exception exception = { };
2281         int err;
2282         do {
2283                 err = nfs4_handle_exception(NFS_SERVER(dir),
2284                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2285                                 &exception);
2286         } while (exception.retry);
2287         return err;
2288 }
2289
2290 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2291                  struct nfs_fsstat *fsstat)
2292 {
2293         struct nfs4_statfs_arg args = {
2294                 .fh = fhandle,
2295                 .bitmask = server->attr_bitmask,
2296         };
2297         struct rpc_message msg = {
2298                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2299                 .rpc_argp = &args,
2300                 .rpc_resp = fsstat,
2301         };
2302
2303         nfs_fattr_init(fsstat->fattr);
2304         return rpc_call_sync(server->client, &msg, 0);
2305 }
2306
2307 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2308 {
2309         struct nfs4_exception exception = { };
2310         int err;
2311         do {
2312                 err = nfs4_handle_exception(server,
2313                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2314                                 &exception);
2315         } while (exception.retry);
2316         return err;
2317 }
2318
2319 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2320                 struct nfs_fsinfo *fsinfo)
2321 {
2322         struct nfs4_fsinfo_arg args = {
2323                 .fh = fhandle,
2324                 .bitmask = server->attr_bitmask,
2325         };
2326         struct rpc_message msg = {
2327                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2328                 .rpc_argp = &args,
2329                 .rpc_resp = fsinfo,
2330         };
2331
2332         return rpc_call_sync(server->client, &msg, 0);
2333 }
2334
2335 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2336 {
2337         struct nfs4_exception exception = { };
2338         int err;
2339
2340         do {
2341                 err = nfs4_handle_exception(server,
2342                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2343                                 &exception);
2344         } while (exception.retry);
2345         return err;
2346 }
2347
2348 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2349 {
2350         nfs_fattr_init(fsinfo->fattr);
2351         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2352 }
2353
2354 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2355                 struct nfs_pathconf *pathconf)
2356 {
2357         struct nfs4_pathconf_arg args = {
2358                 .fh = fhandle,
2359                 .bitmask = server->attr_bitmask,
2360         };
2361         struct rpc_message msg = {
2362                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2363                 .rpc_argp = &args,
2364                 .rpc_resp = pathconf,
2365         };
2366
2367         /* None of the pathconf attributes are mandatory to implement */
2368         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2369                 memset(pathconf, 0, sizeof(*pathconf));
2370                 return 0;
2371         }
2372
2373         nfs_fattr_init(pathconf->fattr);
2374         return rpc_call_sync(server->client, &msg, 0);
2375 }
2376
2377 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2378                 struct nfs_pathconf *pathconf)
2379 {
2380         struct nfs4_exception exception = { };
2381         int err;
2382
2383         do {
2384                 err = nfs4_handle_exception(server,
2385                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2386                                 &exception);
2387         } while (exception.retry);
2388         return err;
2389 }
2390
2391 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2392 {
2393         struct nfs_server *server = NFS_SERVER(data->inode);
2394
2395         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2396                 rpc_restart_call(task);
2397                 return -EAGAIN;
2398         }
2399
2400         nfs_invalidate_atime(data->inode);
2401         if (task->tk_status > 0)
2402                 renew_lease(server, data->timestamp);
2403         return 0;
2404 }
2405
2406 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2407 {
2408         struct rpc_message msg = {
2409                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2410                 .rpc_argp = &data->args,
2411                 .rpc_resp = &data->res,
2412                 .rpc_cred = data->cred,
2413         };
2414
2415         data->timestamp   = jiffies;
2416
2417         rpc_call_setup(&data->task, &msg, 0);
2418 }
2419
2420 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2421 {
2422         struct inode *inode = data->inode;
2423
2424         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2425                 rpc_restart_call(task);
2426                 return -EAGAIN;
2427         }
2428         if (task->tk_status >= 0) {
2429                 renew_lease(NFS_SERVER(inode), data->timestamp);
2430                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2431         }
2432         return 0;
2433 }
2434
2435 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2436 {
2437         struct rpc_message msg = {
2438                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2439                 .rpc_argp = &data->args,
2440                 .rpc_resp = &data->res,
2441                 .rpc_cred = data->cred,
2442         };
2443         struct inode *inode = data->inode;
2444         struct nfs_server *server = NFS_SERVER(inode);
2445         int stable;
2446
2447         if (how & FLUSH_STABLE) {
2448                 if (!NFS_I(inode)->ncommit)
2449                         stable = NFS_FILE_SYNC;
2450                 else
2451                         stable = NFS_DATA_SYNC;
2452         } else
2453                 stable = NFS_UNSTABLE;
2454         data->args.stable = stable;
2455         data->args.bitmask = server->attr_bitmask;
2456         data->res.server = server;
2457
2458         data->timestamp   = jiffies;
2459
2460         /* Finalize the task. */
2461         rpc_call_setup(&data->task, &msg, 0);
2462 }
2463
2464 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2465 {
2466         struct inode *inode = data->inode;
2467
2468         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2469                 rpc_restart_call(task);
2470                 return -EAGAIN;
2471         }
2472         if (task->tk_status >= 0)
2473                 nfs_post_op_update_inode(inode, data->res.fattr);
2474         return 0;
2475 }
2476
2477 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2478 {
2479         struct rpc_message msg = {
2480                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2481                 .rpc_argp = &data->args,
2482                 .rpc_resp = &data->res,
2483                 .rpc_cred = data->cred,
2484         };
2485         struct nfs_server *server = NFS_SERVER(data->inode);
2486
2487         data->args.bitmask = server->attr_bitmask;
2488         data->res.server = server;
2489
2490         rpc_call_setup(&data->task, &msg, 0);
2491 }
2492
2493 /*
2494  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2495  * standalone procedure for queueing an asynchronous RENEW.
2496  */
2497 static void nfs4_renew_done(struct rpc_task *task, void *data)
2498 {
2499         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2500         unsigned long timestamp = (unsigned long)data;
2501
2502         if (task->tk_status < 0) {
2503                 switch (task->tk_status) {
2504                         case -NFS4ERR_STALE_CLIENTID:
2505                         case -NFS4ERR_EXPIRED:
2506                         case -NFS4ERR_CB_PATH_DOWN:
2507                                 nfs4_schedule_state_recovery(clp);
2508                 }
2509                 return;
2510         }
2511         spin_lock(&clp->cl_lock);
2512         if (time_before(clp->cl_last_renewal,timestamp))
2513                 clp->cl_last_renewal = timestamp;
2514         spin_unlock(&clp->cl_lock);
2515 }
2516
2517 static const struct rpc_call_ops nfs4_renew_ops = {
2518         .rpc_call_done = nfs4_renew_done,
2519 };
2520
2521 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2522 {
2523         struct rpc_message msg = {
2524                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2525                 .rpc_argp       = clp,
2526                 .rpc_cred       = cred,
2527         };
2528
2529         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2530                         &nfs4_renew_ops, (void *)jiffies);
2531 }
2532
2533 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2534 {
2535         struct rpc_message msg = {
2536                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2537                 .rpc_argp       = clp,
2538                 .rpc_cred       = cred,
2539         };
2540         unsigned long now = jiffies;
2541         int status;
2542
2543         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2544         if (status < 0)
2545                 return status;
2546         spin_lock(&clp->cl_lock);
2547         if (time_before(clp->cl_last_renewal,now))
2548                 clp->cl_last_renewal = now;
2549         spin_unlock(&clp->cl_lock);
2550         return 0;
2551 }
2552
2553 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2554 {
2555         return (server->caps & NFS_CAP_ACLS)
2556                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2557                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2558 }
2559
2560 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2561  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2562  * the stack.
2563  */
2564 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2565
2566 static void buf_to_pages(const void *buf, size_t buflen,
2567                 struct page **pages, unsigned int *pgbase)
2568 {
2569         const void *p = buf;
2570
2571         *pgbase = offset_in_page(buf);
2572         p -= *pgbase;
2573         while (p < buf + buflen) {
2574                 *(pages++) = virt_to_page(p);
2575                 p += PAGE_CACHE_SIZE;
2576         }
2577 }
2578
2579 struct nfs4_cached_acl {
2580         int cached;
2581         size_t len;
2582         char data[0];
2583 };
2584
2585 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2586 {
2587         struct nfs_inode *nfsi = NFS_I(inode);
2588
2589         spin_lock(&inode->i_lock);
2590         kfree(nfsi->nfs4_acl);
2591         nfsi->nfs4_acl = acl;
2592         spin_unlock(&inode->i_lock);
2593 }
2594
2595 static void nfs4_zap_acl_attr(struct inode *inode)
2596 {
2597         nfs4_set_cached_acl(inode, NULL);
2598 }
2599
2600 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2601 {
2602         struct nfs_inode *nfsi = NFS_I(inode);
2603         struct nfs4_cached_acl *acl;
2604         int ret = -ENOENT;
2605
2606         spin_lock(&inode->i_lock);
2607         acl = nfsi->nfs4_acl;
2608         if (acl == NULL)
2609                 goto out;
2610         if (buf == NULL) /* user is just asking for length */
2611                 goto out_len;
2612         if (acl->cached == 0)
2613                 goto out;
2614         ret = -ERANGE; /* see getxattr(2) man page */
2615         if (acl->len > buflen)
2616                 goto out;
2617         memcpy(buf, acl->data, acl->len);
2618 out_len:
2619         ret = acl->len;
2620 out:
2621         spin_unlock(&inode->i_lock);
2622         return ret;
2623 }
2624
2625 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2626 {
2627         struct nfs4_cached_acl *acl;
2628
2629         if (buf && acl_len <= PAGE_SIZE) {
2630                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2631                 if (acl == NULL)
2632                         goto out;
2633                 acl->cached = 1;
2634                 memcpy(acl->data, buf, acl_len);
2635         } else {
2636                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2637                 if (acl == NULL)
2638                         goto out;
2639                 acl->cached = 0;
2640         }
2641         acl->len = acl_len;
2642 out:
2643         nfs4_set_cached_acl(inode, acl);
2644 }
2645
2646 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2647 {
2648         struct page *pages[NFS4ACL_MAXPAGES];
2649         struct nfs_getaclargs args = {
2650                 .fh = NFS_FH(inode),
2651                 .acl_pages = pages,
2652                 .acl_len = buflen,
2653         };
2654         size_t resp_len = buflen;
2655         void *resp_buf;
2656         struct rpc_message msg = {
2657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2658                 .rpc_argp = &args,
2659                 .rpc_resp = &resp_len,
2660         };
2661         struct page *localpage = NULL;
2662         int ret;
2663
2664         if (buflen < PAGE_SIZE) {
2665                 /* As long as we're doing a round trip to the server anyway,
2666                  * let's be prepared for a page of acl data. */
2667                 localpage = alloc_page(GFP_KERNEL);
2668                 resp_buf = page_address(localpage);
2669                 if (localpage == NULL)
2670                         return -ENOMEM;
2671                 args.acl_pages[0] = localpage;
2672                 args.acl_pgbase = 0;
2673                 resp_len = args.acl_len = PAGE_SIZE;
2674         } else {
2675                 resp_buf = buf;
2676                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2677         }
2678         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2679         if (ret)
2680                 goto out_free;
2681         if (resp_len > args.acl_len)
2682                 nfs4_write_cached_acl(inode, NULL, resp_len);
2683         else
2684                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2685         if (buf) {
2686                 ret = -ERANGE;
2687                 if (resp_len > buflen)
2688                         goto out_free;
2689                 if (localpage)
2690                         memcpy(buf, resp_buf, resp_len);
2691         }
2692         ret = resp_len;
2693 out_free:
2694         if (localpage)
2695                 __free_page(localpage);
2696         return ret;
2697 }
2698
2699 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2700 {
2701         struct nfs4_exception exception = { };
2702         ssize_t ret;
2703         do {
2704                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2705                 if (ret >= 0)
2706                         break;
2707                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2708         } while (exception.retry);
2709         return ret;
2710 }
2711
2712 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2713 {
2714         struct nfs_server *server = NFS_SERVER(inode);
2715         int ret;
2716
2717         if (!nfs4_server_supports_acls(server))
2718                 return -EOPNOTSUPP;
2719         ret = nfs_revalidate_inode(server, inode);
2720         if (ret < 0)
2721                 return ret;
2722         ret = nfs4_read_cached_acl(inode, buf, buflen);
2723         if (ret != -ENOENT)
2724                 return ret;
2725         return nfs4_get_acl_uncached(inode, buf, buflen);
2726 }
2727
2728 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2729 {
2730         struct nfs_server *server = NFS_SERVER(inode);
2731         struct page *pages[NFS4ACL_MAXPAGES];
2732         struct nfs_setaclargs arg = {
2733                 .fh             = NFS_FH(inode),
2734                 .acl_pages      = pages,
2735                 .acl_len        = buflen,
2736         };
2737         struct rpc_message msg = {
2738                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2739                 .rpc_argp       = &arg,
2740                 .rpc_resp       = NULL,
2741         };
2742         int ret;
2743
2744         if (!nfs4_server_supports_acls(server))
2745                 return -EOPNOTSUPP;
2746         nfs_inode_return_delegation(inode);
2747         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2748         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2749         nfs_zap_caches(inode);
2750         return ret;
2751 }
2752
2753 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2754 {
2755         struct nfs4_exception exception = { };
2756         int err;
2757         do {
2758                 err = nfs4_handle_exception(NFS_SERVER(inode),
2759                                 __nfs4_proc_set_acl(inode, buf, buflen),
2760                                 &exception);
2761         } while (exception.retry);
2762         return err;
2763 }
2764
2765 static int
2766 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2767 {
2768         struct nfs_client *clp = server->nfs_client;
2769
2770         if (!clp || task->tk_status >= 0)
2771                 return 0;
2772         switch(task->tk_status) {
2773                 case -NFS4ERR_STALE_CLIENTID:
2774                 case -NFS4ERR_STALE_STATEID:
2775                 case -NFS4ERR_EXPIRED:
2776                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2777                         nfs4_schedule_state_recovery(clp);
2778                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2779                                 rpc_wake_up_task(task);
2780                         task->tk_status = 0;
2781                         return -EAGAIN;
2782                 case -NFS4ERR_DELAY:
2783                         nfs_inc_server_stats((struct nfs_server *) server,
2784                                                 NFSIOS_DELAY);
2785                 case -NFS4ERR_GRACE:
2786                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2787                         task->tk_status = 0;
2788                         return -EAGAIN;
2789                 case -NFS4ERR_OLD_STATEID:
2790                         task->tk_status = 0;
2791                         return -EAGAIN;
2792         }
2793         task->tk_status = nfs4_map_errors(task->tk_status);
2794         return 0;
2795 }
2796
2797 static int nfs4_wait_bit_interruptible(void *word)
2798 {
2799         if (signal_pending(current))
2800                 return -ERESTARTSYS;
2801         schedule();
2802         return 0;
2803 }
2804
2805 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2806 {
2807         sigset_t oldset;
2808         int res;
2809
2810         might_sleep();
2811
2812         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2813
2814         rpc_clnt_sigmask(clnt, &oldset);
2815         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2816                         nfs4_wait_bit_interruptible,
2817                         TASK_INTERRUPTIBLE);
2818         rpc_clnt_sigunmask(clnt, &oldset);
2819
2820         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2821         return res;
2822 }
2823
2824 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2825 {
2826         sigset_t oldset;
2827         int res = 0;
2828
2829         might_sleep();
2830
2831         if (*timeout <= 0)
2832                 *timeout = NFS4_POLL_RETRY_MIN;
2833         if (*timeout > NFS4_POLL_RETRY_MAX)
2834                 *timeout = NFS4_POLL_RETRY_MAX;
2835         rpc_clnt_sigmask(clnt, &oldset);
2836         if (clnt->cl_intr) {
2837                 schedule_timeout_interruptible(*timeout);
2838                 if (signalled())
2839                         res = -ERESTARTSYS;
2840         } else
2841                 schedule_timeout_uninterruptible(*timeout);
2842         rpc_clnt_sigunmask(clnt, &oldset);
2843         *timeout <<= 1;
2844         return res;
2845 }
2846
2847 /* This is the error handling routine for processes that are allowed
2848  * to sleep.
2849  */
2850 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2851 {
2852         struct nfs_client *clp = server->nfs_client;
2853         int ret = errorcode;
2854
2855         exception->retry = 0;
2856         switch(errorcode) {
2857                 case 0:
2858                         return 0;
2859                 case -NFS4ERR_STALE_CLIENTID:
2860                 case -NFS4ERR_STALE_STATEID:
2861                 case -NFS4ERR_EXPIRED:
2862                         nfs4_schedule_state_recovery(clp);
2863                         ret = nfs4_wait_clnt_recover(server->client, clp);
2864                         if (ret == 0)
2865                                 exception->retry = 1;
2866                         break;
2867                 case -NFS4ERR_FILE_OPEN:
2868                 case -NFS4ERR_GRACE:
2869                 case -NFS4ERR_DELAY:
2870                         ret = nfs4_delay(server->client, &exception->timeout);
2871                         if (ret != 0)
2872                                 break;
2873                 case -NFS4ERR_OLD_STATEID:
2874                         exception->retry = 1;
2875         }
2876         /* We failed to handle the error */
2877         return nfs4_map_errors(ret);
2878 }
2879
2880 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2881 {
2882         nfs4_verifier sc_verifier;
2883         struct nfs4_setclientid setclientid = {
2884                 .sc_verifier = &sc_verifier,
2885                 .sc_prog = program,
2886         };
2887         struct rpc_message msg = {
2888                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2889                 .rpc_argp = &setclientid,
2890                 .rpc_resp = clp,
2891                 .rpc_cred = cred,
2892         };
2893         __be32 *p;
2894         int loop = 0;
2895         int status;
2896
2897         p = (__be32*)sc_verifier.data;
2898         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2899         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2900
2901         for(;;) {
2902                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2903                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2904                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2905                                 cred->cr_ops->cr_name,
2906                                 clp->cl_id_uniquifier);
2907                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2908                                 sizeof(setclientid.sc_netid), "tcp");
2909                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2910                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2911                                 clp->cl_ipaddr, port >> 8, port & 255);
2912
2913                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2914                 if (status != -NFS4ERR_CLID_INUSE)
2915                         break;
2916                 if (signalled())
2917                         break;
2918                 if (loop++ & 1)
2919                         ssleep(clp->cl_lease_time + 1);
2920                 else
2921                         if (++clp->cl_id_uniquifier == 0)
2922                                 break;
2923         }
2924         return status;
2925 }
2926
2927 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2928 {
2929         struct nfs_fsinfo fsinfo;
2930         struct rpc_message msg = {
2931                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2932                 .rpc_argp = clp,
2933                 .rpc_resp = &fsinfo,
2934                 .rpc_cred = cred,
2935         };
2936         unsigned long now;
2937         int status;
2938
2939         now = jiffies;
2940         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2941         if (status == 0) {
2942                 spin_lock(&clp->cl_lock);
2943                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2944                 clp->cl_last_renewal = now;
2945                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2946                 spin_unlock(&clp->cl_lock);
2947         }
2948         return status;
2949 }
2950
2951 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2952 {
2953         long timeout;
2954         int err;
2955         do {
2956                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2957                 switch (err) {
2958                         case 0:
2959                                 return err;
2960                         case -NFS4ERR_RESOURCE:
2961                                 /* The IBM lawyers misread another document! */
2962                         case -NFS4ERR_DELAY:
2963                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2964                 }
2965         } while (err == 0);
2966         return err;
2967 }
2968
2969 struct nfs4_delegreturndata {
2970         struct nfs4_delegreturnargs args;
2971         struct nfs4_delegreturnres res;
2972         struct nfs_fh fh;
2973         nfs4_stateid stateid;
2974         struct rpc_cred *cred;
2975         unsigned long timestamp;
2976         struct nfs_fattr fattr;
2977         int rpc_status;
2978 };
2979
2980 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2981 {
2982         struct nfs4_delegreturndata *data = calldata;
2983         struct rpc_message msg = {
2984                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2985                 .rpc_argp = &data->args,
2986                 .rpc_resp = &data->res,
2987                 .rpc_cred = data->cred,
2988         };
2989         nfs_fattr_init(data->res.fattr);
2990         rpc_call_setup(task, &msg, 0);
2991 }
2992
2993 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2994 {
2995         struct nfs4_delegreturndata *data = calldata;
2996         data->rpc_status = task->tk_status;
2997         if (data->rpc_status == 0)
2998                 renew_lease(data->res.server, data->timestamp);
2999 }
3000
3001 static void nfs4_delegreturn_release(void *calldata)
3002 {
3003         struct nfs4_delegreturndata *data = calldata;
3004
3005         put_rpccred(data->cred);
3006         kfree(calldata);
3007 }
3008
3009 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3010         .rpc_call_prepare = nfs4_delegreturn_prepare,
3011         .rpc_call_done = nfs4_delegreturn_done,
3012         .rpc_release = nfs4_delegreturn_release,
3013 };
3014
3015 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3016 {
3017         struct nfs4_delegreturndata *data;
3018         struct nfs_server *server = NFS_SERVER(inode);
3019         struct rpc_task *task;
3020         int status;
3021
3022         data = kmalloc(sizeof(*data), GFP_KERNEL);
3023         if (data == NULL)
3024                 return -ENOMEM;
3025         data->args.fhandle = &data->fh;
3026         data->args.stateid = &data->stateid;
3027         data->args.bitmask = server->attr_bitmask;
3028         nfs_copy_fh(&data->fh, NFS_FH(inode));
3029         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3030         data->res.fattr = &data->fattr;
3031         data->res.server = server;
3032         data->cred = get_rpccred(cred);
3033         data->timestamp = jiffies;
3034         data->rpc_status = 0;
3035
3036         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3037         if (IS_ERR(task))
3038                 return PTR_ERR(task);
3039         status = nfs4_wait_for_completion_rpc_task(task);
3040         if (status == 0) {
3041                 status = data->rpc_status;
3042                 if (status == 0)
3043                         nfs_post_op_update_inode(inode, &data->fattr);
3044         }
3045         rpc_put_task(task);
3046         return status;
3047 }
3048
3049 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3050 {
3051         struct nfs_server *server = NFS_SERVER(inode);
3052         struct nfs4_exception exception = { };
3053         int err;
3054         do {
3055                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3056                 switch (err) {
3057                         case -NFS4ERR_STALE_STATEID:
3058                         case -NFS4ERR_EXPIRED:
3059                         case 0:
3060                                 return 0;
3061                 }
3062                 err = nfs4_handle_exception(server, err, &exception);
3063         } while (exception.retry);
3064         return err;
3065 }
3066
3067 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3068 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3069
3070 /*
3071  * sleep, with exponential backoff, and retry the LOCK operation.
3072  */
3073 static unsigned long
3074 nfs4_set_lock_task_retry(unsigned long timeout)
3075 {
3076         schedule_timeout_interruptible(timeout);
3077         timeout <<= 1;
3078         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3079                 return NFS4_LOCK_MAXTIMEOUT;
3080         return timeout;
3081 }
3082
3083 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3084 {
3085         struct inode *inode = state->inode;
3086         struct nfs_server *server = NFS_SERVER(inode);
3087         struct nfs_client *clp = server->nfs_client;
3088         struct nfs_lockt_args arg = {
3089                 .fh = NFS_FH(inode),
3090                 .fl = request,
3091         };
3092         struct nfs_lockt_res res = {
3093                 .denied = request,
3094         };
3095         struct rpc_message msg = {
3096                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3097                 .rpc_argp       = &arg,
3098                 .rpc_resp       = &res,
3099                 .rpc_cred       = state->owner->so_cred,
3100         };
3101         struct nfs4_lock_state *lsp;
3102         int status;
3103
3104         down_read(&clp->cl_sem);
3105         arg.lock_owner.clientid = clp->cl_clientid;
3106         status = nfs4_set_lock_state(state, request);
3107         if (status != 0)
3108                 goto out;
3109         lsp = request->fl_u.nfs4_fl.owner;
3110         arg.lock_owner.id = lsp->ls_id.id;
3111         status = rpc_call_sync(server->client, &msg, 0);
3112         switch (status) {
3113                 case 0:
3114                         request->fl_type = F_UNLCK;
3115                         break;
3116                 case -NFS4ERR_DENIED:
3117                         status = 0;
3118         }
3119         request->fl_ops->fl_release_private(request);
3120 out:
3121         up_read(&clp->cl_sem);
3122         return status;
3123 }
3124
3125 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3126 {
3127         struct nfs4_exception exception = { };
3128         int err;
3129
3130         do {
3131                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3132                                 _nfs4_proc_getlk(state, cmd, request),
3133                                 &exception);
3134         } while (exception.retry);
3135         return err;
3136 }
3137
3138 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3139 {
3140         int res = 0;
3141         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3142                 case FL_POSIX:
3143                         res = posix_lock_file_wait(file, fl);
3144                         break;
3145                 case FL_FLOCK:
3146                         res = flock_lock_file_wait(file, fl);
3147                         break;
3148                 default:
3149                         BUG();
3150         }
3151         return res;
3152 }
3153
3154 struct nfs4_unlockdata {
3155         struct nfs_locku_args arg;
3156         struct nfs_locku_res res;
3157         struct nfs4_lock_state *lsp;
3158         struct nfs_open_context *ctx;
3159         struct file_lock fl;
3160         const struct nfs_server *server;
3161         unsigned long timestamp;
3162 };
3163
3164 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3165                 struct nfs_open_context *ctx,
3166                 struct nfs4_lock_state *lsp,
3167                 struct nfs_seqid *seqid)
3168 {
3169         struct nfs4_unlockdata *p;
3170         struct inode *inode = lsp->ls_state->inode;
3171
3172         p = kmalloc(sizeof(*p), GFP_KERNEL);
3173         if (p == NULL)
3174                 return NULL;
3175         p->arg.fh = NFS_FH(inode);
3176         p->arg.fl = &p->fl;
3177         p->arg.seqid = seqid;
3178         p->arg.stateid = &lsp->ls_stateid;
3179         p->lsp = lsp;
3180         atomic_inc(&lsp->ls_count);
3181         /* Ensure we don't close file until we're done freeing locks! */
3182         p->ctx = get_nfs_open_context(ctx);
3183         memcpy(&p->fl, fl, sizeof(p->fl));
3184         p->server = NFS_SERVER(inode);
3185         return p;
3186 }
3187
3188 static void nfs4_locku_release_calldata(void *data)
3189 {
3190         struct nfs4_unlockdata *calldata = data;
3191         nfs_free_seqid(calldata->arg.seqid);
3192         nfs4_put_lock_state(calldata->lsp);
3193         put_nfs_open_context(calldata->ctx);
3194         kfree(calldata);
3195 }
3196
3197 static void nfs4_locku_done(struct rpc_task *task, void *data)
3198 {
3199         struct nfs4_unlockdata *calldata = data;
3200
3201         if (RPC_ASSASSINATED(task))
3202                 return;
3203         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3204         switch (task->tk_status) {
3205                 case 0:
3206                         memcpy(calldata->lsp->ls_stateid.data,
3207                                         calldata->res.stateid.data,
3208                                         sizeof(calldata->lsp->ls_stateid.data));
3209                         renew_lease(calldata->server, calldata->timestamp);
3210                         break;
3211                 case -NFS4ERR_STALE_STATEID:
3212                 case -NFS4ERR_EXPIRED:
3213                         break;
3214                 default:
3215                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3216                                 rpc_restart_call(task);
3217         }
3218 }
3219
3220 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3221 {
3222         struct nfs4_unlockdata *calldata = data;
3223         struct rpc_message msg = {
3224                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3225                 .rpc_argp       = &calldata->arg,
3226                 .rpc_resp       = &calldata->res,
3227                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3228         };
3229
3230         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3231                 return;
3232         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3233                 /* Note: exit _without_ running nfs4_locku_done */
3234                 task->tk_action = NULL;
3235                 return;
3236         }
3237         calldata->timestamp = jiffies;
3238         rpc_call_setup(task, &msg, 0);
3239 }
3240
3241 static const struct rpc_call_ops nfs4_locku_ops = {
3242         .rpc_call_prepare = nfs4_locku_prepare,
3243         .rpc_call_done = nfs4_locku_done,
3244         .rpc_release = nfs4_locku_release_calldata,
3245 };
3246
3247 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3248                 struct nfs_open_context *ctx,
3249                 struct nfs4_lock_state *lsp,
3250                 struct nfs_seqid *seqid)
3251 {
3252         struct nfs4_unlockdata *data;
3253
3254         /* Ensure this is an unlock - when canceling a lock, the
3255          * canceled lock is passed in, and it won't be an unlock.
3256          */
3257         fl->fl_type = F_UNLCK;
3258
3259         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3260         if (data == NULL) {
3261                 nfs_free_seqid(seqid);
3262                 return ERR_PTR(-ENOMEM);
3263         }
3264
3265         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3266 }
3267
3268 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3269 {
3270         struct nfs_seqid *seqid;
3271         struct nfs4_lock_state *lsp;
3272         struct rpc_task *task;
3273         int status = 0;
3274
3275         status = nfs4_set_lock_state(state, request);
3276         /* Unlock _before_ we do the RPC call */
3277         request->fl_flags |= FL_EXISTS;
3278         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3279                 goto out;
3280         if (status != 0)
3281                 goto out;
3282         /* Is this a delegated lock? */
3283         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3284                 goto out;
3285         lsp = request->fl_u.nfs4_fl.owner;
3286         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3287         status = -ENOMEM;
3288         if (seqid == NULL)
3289                 goto out;
3290         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3291         status = PTR_ERR(task);
3292         if (IS_ERR(task))
3293                 goto out;
3294         status = nfs4_wait_for_completion_rpc_task(task);
3295         rpc_put_task(task);
3296 out:
3297         return status;
3298 }
3299
3300 struct nfs4_lockdata {
3301         struct nfs_lock_args arg;
3302         struct nfs_lock_res res;
3303         struct nfs4_lock_state *lsp;
3304         struct nfs_open_context *ctx;
3305         struct file_lock fl;
3306         unsigned long timestamp;
3307         int rpc_status;
3308         int cancelled;
3309 };
3310
3311 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3312                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3313 {
3314         struct nfs4_lockdata *p;
3315         struct inode *inode = lsp->ls_state->inode;
3316         struct nfs_server *server = NFS_SERVER(inode);
3317
3318         p = kzalloc(sizeof(*p), GFP_KERNEL);
3319         if (p == NULL)
3320                 return NULL;
3321
3322         p->arg.fh = NFS_FH(inode);
3323         p->arg.fl = &p->fl;
3324         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3325         if (p->arg.lock_seqid == NULL)
3326                 goto out_free;
3327         p->arg.lock_stateid = &lsp->ls_stateid;
3328         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3329         p->arg.lock_owner.id = lsp->ls_id.id;
3330         p->lsp = lsp;
3331         atomic_inc(&lsp->ls_count);
3332         p->ctx = get_nfs_open_context(ctx);
3333         memcpy(&p->fl, fl, sizeof(p->fl));
3334         return p;
3335 out_free:
3336         kfree(p);
3337         return NULL;
3338 }
3339
3340 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3341 {
3342         struct nfs4_lockdata *data = calldata;
3343         struct nfs4_state *state = data->lsp->ls_state;
3344         struct nfs4_state_owner *sp = state->owner;
3345         struct rpc_message msg = {
3346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3347                 .rpc_argp = &data->arg,
3348                 .rpc_resp = &data->res,
3349                 .rpc_cred = sp->so_cred,
3350         };
3351
3352         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3353                 return;
3354         dprintk("%s: begin!\n", __FUNCTION__);
3355         /* Do we need to do an open_to_lock_owner? */
3356         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3357                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3358                 if (data->arg.open_seqid == NULL) {
3359                         data->rpc_status = -ENOMEM;
3360                         task->tk_action = NULL;
3361                         goto out;
3362                 }
3363                 data->arg.open_stateid = &state->stateid;
3364                 data->arg.new_lock_owner = 1;
3365         }
3366         data->timestamp = jiffies;
3367         rpc_call_setup(task, &msg, 0);
3368 out:
3369         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3370 }
3371
3372 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3373 {
3374         struct nfs4_lockdata *data = calldata;
3375
3376         dprintk("%s: begin!\n", __FUNCTION__);
3377
3378         data->rpc_status = task->tk_status;
3379         if (RPC_ASSASSINATED(task))
3380                 goto out;
3381         if (data->arg.new_lock_owner != 0) {
3382                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3383                 if (data->rpc_status == 0)
3384                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3385                 else
3386                         goto out;
3387         }
3388         if (data->rpc_status == 0) {
3389                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3390                                         sizeof(data->lsp->ls_stateid.data));
3391                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3392                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3393         }
3394         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3395 out:
3396         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3397 }
3398
3399 static void nfs4_lock_release(void *calldata)
3400 {
3401         struct nfs4_lockdata *data = calldata;
3402
3403         dprintk("%s: begin!\n", __FUNCTION__);
3404         if (data->arg.open_seqid != NULL)
3405                 nfs_free_seqid(data->arg.open_seqid);
3406         if (data->cancelled != 0) {
3407                 struct rpc_task *task;
3408                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3409                                 data->arg.lock_seqid);
3410                 if (!IS_ERR(task))
3411                         rpc_put_task(task);
3412                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3413         } else
3414                 nfs_free_seqid(data->arg.lock_seqid);
3415         nfs4_put_lock_state(data->lsp);
3416         put_nfs_open_context(data->ctx);
3417         kfree(data);
3418         dprintk("%s: done!\n", __FUNCTION__);
3419 }
3420
3421 static const struct rpc_call_ops nfs4_lock_ops = {
3422         .rpc_call_prepare = nfs4_lock_prepare,
3423         .rpc_call_done = nfs4_lock_done,
3424         .rpc_release = nfs4_lock_release,
3425 };
3426
3427 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3428 {
3429         struct nfs4_lockdata *data;
3430         struct rpc_task *task;
3431         int ret;
3432
3433         dprintk("%s: begin!\n", __FUNCTION__);
3434         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3435                         fl->fl_u.nfs4_fl.owner);
3436         if (data == NULL)
3437                 return -ENOMEM;
3438         if (IS_SETLKW(cmd))
3439                 data->arg.block = 1;
3440         if (reclaim != 0)
3441                 data->arg.reclaim = 1;
3442         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3443                         &nfs4_lock_ops, data);
3444         if (IS_ERR(task))
3445                 return PTR_ERR(task);
3446         ret = nfs4_wait_for_completion_rpc_task(task);
3447         if (ret == 0) {
3448                 ret = data->rpc_status;
3449                 if (ret == -NFS4ERR_DENIED)
3450                         ret = -EAGAIN;
3451         } else
3452                 data->cancelled = 1;
3453         rpc_put_task(task);
3454         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3455         return ret;
3456 }
3457
3458 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3459 {
3460         struct nfs_server *server = NFS_SERVER(state->inode);
3461         struct nfs4_exception exception = { };
3462         int err;
3463
3464         do {
3465                 /* Cache the lock if possible... */
3466                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3467                         return 0;
3468                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3469                 if (err != -NFS4ERR_DELAY)
3470                         break;
3471                 nfs4_handle_exception(server, err, &exception);
3472         } while (exception.retry);
3473         return err;
3474 }
3475
3476 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3477 {
3478         struct nfs_server *server = NFS_SERVER(state->inode);
3479         struct nfs4_exception exception = { };
3480         int err;
3481
3482         err = nfs4_set_lock_state(state, request);
3483         if (err != 0)
3484                 return err;
3485         do {
3486                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3487                         return 0;
3488                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3489                 if (err != -NFS4ERR_DELAY)
3490                         break;
3491                 nfs4_handle_exception(server, err, &exception);
3492         } while (exception.retry);
3493         return err;
3494 }
3495
3496 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3497 {
3498         struct nfs_client *clp = state->owner->so_client;
3499         unsigned char fl_flags = request->fl_flags;
3500         int status;
3501
3502         /* Is this a delegated open? */
3503         status = nfs4_set_lock_state(state, request);
3504         if (status != 0)
3505                 goto out;
3506         request->fl_flags |= FL_ACCESS;
3507         status = do_vfs_lock(request->fl_file, request);
3508         if (status < 0)
3509                 goto out;
3510         down_read(&clp->cl_sem);
3511         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3512                 struct nfs_inode *nfsi = NFS_I(state->inode);
3513                 /* Yes: cache locks! */
3514                 down_read(&nfsi->rwsem);
3515                 /* ...but avoid races with delegation recall... */
3516                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3517                         request->fl_flags = fl_flags & ~FL_SLEEP;
3518                         status = do_vfs_lock(request->fl_file, request);
3519                         up_read(&nfsi->rwsem);
3520                         goto out_unlock;
3521                 }
3522                 up_read(&nfsi->rwsem);
3523         }
3524         status = _nfs4_do_setlk(state, cmd, request, 0);
3525         if (status != 0)
3526                 goto out_unlock;
3527         /* Note: we always want to sleep here! */
3528         request->fl_flags = fl_flags | FL_SLEEP;
3529         if (do_vfs_lock(request->fl_file, request) < 0)
3530                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3531 out_unlock:
3532         up_read(&clp->cl_sem);
3533 out:
3534         request->fl_flags = fl_flags;
3535         return status;
3536 }
3537
3538 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3539 {
3540         struct nfs4_exception exception = { };
3541         int err;
3542
3543         do {
3544                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3545                                 _nfs4_proc_setlk(state, cmd, request),
3546                                 &exception);
3547         } while (exception.retry);
3548         return err;
3549 }
3550
3551 static int
3552 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3553 {
3554         struct nfs_open_context *ctx;
3555         struct nfs4_state *state;
3556         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3557         int status;
3558
3559         /* verify open state */
3560         ctx = nfs_file_open_context(filp);
3561         state = ctx->state;
3562
3563         if (request->fl_start < 0 || request->fl_end < 0)
3564                 return -EINVAL;
3565
3566         if (IS_GETLK(cmd))
3567                 return nfs4_proc_getlk(state, F_GETLK, request);
3568
3569         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3570                 return -EINVAL;
3571
3572         if (request->fl_type == F_UNLCK)
3573                 return nfs4_proc_unlck(state, cmd, request);
3574
3575         do {
3576                 status = nfs4_proc_setlk(state, cmd, request);
3577                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3578                         break;
3579                 timeout = nfs4_set_lock_task_retry(timeout);
3580                 status = -ERESTARTSYS;
3581                 if (signalled())
3582                         break;
3583         } while(status < 0);
3584         return status;
3585 }
3586
3587 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3588 {
3589         struct nfs_server *server = NFS_SERVER(state->inode);
3590         struct nfs4_exception exception = { };
3591         int err;
3592
3593         err = nfs4_set_lock_state(state, fl);
3594         if (err != 0)
3595                 goto out;
3596         do {
3597                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3598                 if (err != -NFS4ERR_DELAY)
3599                         break;
3600                 err = nfs4_handle_exception(server, err, &exception);
3601         } while (exception.retry);
3602 out:
3603         return err;
3604 }
3605
3606 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3607
3608 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3609                 size_t buflen, int flags)
3610 {
3611         struct inode *inode = dentry->d_inode;
3612
3613         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3614                 return -EOPNOTSUPP;
3615
3616         if (!S_ISREG(inode->i_mode) &&
3617             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3618                 return -EPERM;
3619
3620         return nfs4_proc_set_acl(inode, buf, buflen);
3621 }
3622
3623 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3624  * and that's what we'll do for e.g. user attributes that haven't been set.
3625  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3626  * attributes in kernel-managed attribute namespaces. */
3627 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3628                 size_t buflen)
3629 {
3630         struct inode *inode = dentry->d_inode;
3631
3632         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3633                 return -EOPNOTSUPP;
3634
3635         return nfs4_proc_get_acl(inode, buf, buflen);
3636 }
3637
3638 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3639 {
3640         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3641
3642         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3643                 return 0;
3644         if (buf && buflen < len)
3645                 return -ERANGE;
3646         if (buf)
3647                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3648         return len;
3649 }
3650
3651 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3652                 struct nfs4_fs_locations *fs_locations, struct page *page)
3653 {
3654         struct nfs_server *server = NFS_SERVER(dir);
3655         u32 bitmask[2] = {
3656                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3657                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3658         };
3659         struct nfs4_fs_locations_arg args = {
3660                 .dir_fh = NFS_FH(dir),
3661                 .name = name,
3662                 .page = page,
3663                 .bitmask = bitmask,
3664         };
3665         struct rpc_message msg = {
3666                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3667                 .rpc_argp = &args,
3668                 .rpc_resp = fs_locations,
3669         };
3670         int status;
3671
3672         dprintk("%s: start\n", __FUNCTION__);
3673         nfs_fattr_init(&fs_locations->fattr);
3674         fs_locations->server = server;
3675         fs_locations->nlocations = 0;
3676         status = rpc_call_sync(server->client, &msg, 0);
3677         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3678         return status;
3679 }
3680
3681 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3682         .recover_open   = nfs4_open_reclaim,
3683         .recover_lock   = nfs4_lock_reclaim,
3684 };
3685
3686 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3687         .recover_open   = nfs4_open_expired,
3688         .recover_lock   = nfs4_lock_expired,
3689 };
3690
3691 static const struct inode_operations nfs4_file_inode_operations = {
3692         .permission     = nfs_permission,
3693         .getattr        = nfs_getattr,
3694         .setattr        = nfs_setattr,
3695         .getxattr       = nfs4_getxattr,
3696         .setxattr       = nfs4_setxattr,
3697         .listxattr      = nfs4_listxattr,
3698 };
3699
3700 const struct nfs_rpc_ops nfs_v4_clientops = {
3701         .version        = 4,                    /* protocol version */
3702         .dentry_ops     = &nfs4_dentry_operations,
3703         .dir_inode_ops  = &nfs4_dir_inode_operations,
3704         .file_inode_ops = &nfs4_file_inode_operations,
3705         .getroot        = nfs4_proc_get_root,
3706         .getattr        = nfs4_proc_getattr,
3707         .setattr        = nfs4_proc_setattr,
3708         .lookupfh       = nfs4_proc_lookupfh,
3709         .lookup         = nfs4_proc_lookup,
3710         .access         = nfs4_proc_access,
3711         .readlink       = nfs4_proc_readlink,
3712         .create         = nfs4_proc_create,
3713         .remove         = nfs4_proc_remove,
3714         .unlink_setup   = nfs4_proc_unlink_setup,
3715         .unlink_done    = nfs4_proc_unlink_done,
3716         .rename         = nfs4_proc_rename,
3717         .link           = nfs4_proc_link,
3718         .symlink        = nfs4_proc_symlink,
3719         .mkdir          = nfs4_proc_mkdir,
3720         .rmdir          = nfs4_proc_remove,
3721         .readdir        = nfs4_proc_readdir,
3722         .mknod          = nfs4_proc_mknod,
3723         .statfs         = nfs4_proc_statfs,
3724         .fsinfo         = nfs4_proc_fsinfo,
3725         .pathconf       = nfs4_proc_pathconf,
3726         .set_capabilities = nfs4_server_capabilities,
3727         .decode_dirent  = nfs4_decode_dirent,
3728         .read_setup     = nfs4_proc_read_setup,
3729         .read_done      = nfs4_read_done,
3730         .write_setup    = nfs4_proc_write_setup,
3731         .write_done     = nfs4_write_done,
3732         .commit_setup   = nfs4_proc_commit_setup,
3733         .commit_done    = nfs4_commit_done,
3734         .file_open      = nfs_open,
3735         .file_release   = nfs_release,
3736         .lock           = nfs4_proc_lock,
3737         .clear_acl_cache = nfs4_zap_acl_attr,
3738 };
3739
3740 /*
3741  * Local variables:
3742  *  c-basic-offset: 8
3743  * End:
3744  */