fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         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         dprintk("%s: returns %d\n", __FUNCTION__, status);
2201         return status;
2202 }
2203
2204 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2205                   u64 cookie, struct page *page, unsigned int count, int plus)
2206 {
2207         struct nfs4_exception exception = { };
2208         int err;
2209         do {
2210                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2211                                 _nfs4_proc_readdir(dentry, cred, cookie,
2212                                         page, count, plus),
2213                                 &exception);
2214         } while (exception.retry);
2215         return err;
2216 }
2217
2218 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2219                 struct iattr *sattr, dev_t rdev)
2220 {
2221         struct nfs_server *server = NFS_SERVER(dir);
2222         struct nfs_fh fh;
2223         struct nfs_fattr fattr, dir_fattr;
2224         struct nfs4_create_arg arg = {
2225                 .dir_fh = NFS_FH(dir),
2226                 .server = server,
2227                 .name = &dentry->d_name,
2228                 .attrs = sattr,
2229                 .bitmask = server->attr_bitmask,
2230         };
2231         struct nfs4_create_res res = {
2232                 .server = server,
2233                 .fh = &fh,
2234                 .fattr = &fattr,
2235                 .dir_fattr = &dir_fattr,
2236         };
2237         struct rpc_message msg = {
2238                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2239                 .rpc_argp = &arg,
2240                 .rpc_resp = &res,
2241         };
2242         int                     status;
2243         int                     mode = sattr->ia_mode;
2244
2245         nfs_fattr_init(&fattr);
2246         nfs_fattr_init(&dir_fattr);
2247
2248         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2249         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2250         if (S_ISFIFO(mode))
2251                 arg.ftype = NF4FIFO;
2252         else if (S_ISBLK(mode)) {
2253                 arg.ftype = NF4BLK;
2254                 arg.u.device.specdata1 = MAJOR(rdev);
2255                 arg.u.device.specdata2 = MINOR(rdev);
2256         }
2257         else if (S_ISCHR(mode)) {
2258                 arg.ftype = NF4CHR;
2259                 arg.u.device.specdata1 = MAJOR(rdev);
2260                 arg.u.device.specdata2 = MINOR(rdev);
2261         }
2262         else
2263                 arg.ftype = NF4SOCK;
2264
2265         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2266         if (status == 0) {
2267                 update_changeattr(dir, &res.dir_cinfo);
2268                 nfs_post_op_update_inode(dir, res.dir_fattr);
2269                 status = nfs_instantiate(dentry, &fh, &fattr);
2270         }
2271         return status;
2272 }
2273
2274 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2275                 struct iattr *sattr, dev_t rdev)
2276 {
2277         struct nfs4_exception exception = { };
2278         int err;
2279         do {
2280                 err = nfs4_handle_exception(NFS_SERVER(dir),
2281                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2282                                 &exception);
2283         } while (exception.retry);
2284         return err;
2285 }
2286
2287 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2288                  struct nfs_fsstat *fsstat)
2289 {
2290         struct nfs4_statfs_arg args = {
2291                 .fh = fhandle,
2292                 .bitmask = server->attr_bitmask,
2293         };
2294         struct rpc_message msg = {
2295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2296                 .rpc_argp = &args,
2297                 .rpc_resp = fsstat,
2298         };
2299
2300         nfs_fattr_init(fsstat->fattr);
2301         return rpc_call_sync(server->client, &msg, 0);
2302 }
2303
2304 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2305 {
2306         struct nfs4_exception exception = { };
2307         int err;
2308         do {
2309                 err = nfs4_handle_exception(server,
2310                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2311                                 &exception);
2312         } while (exception.retry);
2313         return err;
2314 }
2315
2316 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2317                 struct nfs_fsinfo *fsinfo)
2318 {
2319         struct nfs4_fsinfo_arg args = {
2320                 .fh = fhandle,
2321                 .bitmask = server->attr_bitmask,
2322         };
2323         struct rpc_message msg = {
2324                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2325                 .rpc_argp = &args,
2326                 .rpc_resp = fsinfo,
2327         };
2328
2329         return rpc_call_sync(server->client, &msg, 0);
2330 }
2331
2332 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2333 {
2334         struct nfs4_exception exception = { };
2335         int err;
2336
2337         do {
2338                 err = nfs4_handle_exception(server,
2339                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2340                                 &exception);
2341         } while (exception.retry);
2342         return err;
2343 }
2344
2345 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2346 {
2347         nfs_fattr_init(fsinfo->fattr);
2348         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2349 }
2350
2351 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2352                 struct nfs_pathconf *pathconf)
2353 {
2354         struct nfs4_pathconf_arg args = {
2355                 .fh = fhandle,
2356                 .bitmask = server->attr_bitmask,
2357         };
2358         struct rpc_message msg = {
2359                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2360                 .rpc_argp = &args,
2361                 .rpc_resp = pathconf,
2362         };
2363
2364         /* None of the pathconf attributes are mandatory to implement */
2365         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2366                 memset(pathconf, 0, sizeof(*pathconf));
2367                 return 0;
2368         }
2369
2370         nfs_fattr_init(pathconf->fattr);
2371         return rpc_call_sync(server->client, &msg, 0);
2372 }
2373
2374 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2375                 struct nfs_pathconf *pathconf)
2376 {
2377         struct nfs4_exception exception = { };
2378         int err;
2379
2380         do {
2381                 err = nfs4_handle_exception(server,
2382                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2383                                 &exception);
2384         } while (exception.retry);
2385         return err;
2386 }
2387
2388 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2389 {
2390         struct nfs_server *server = NFS_SERVER(data->inode);
2391
2392         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2393                 rpc_restart_call(task);
2394                 return -EAGAIN;
2395         }
2396         if (task->tk_status > 0)
2397                 renew_lease(server, data->timestamp);
2398         return 0;
2399 }
2400
2401 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2402 {
2403         struct rpc_message msg = {
2404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2405                 .rpc_argp = &data->args,
2406                 .rpc_resp = &data->res,
2407                 .rpc_cred = data->cred,
2408         };
2409
2410         data->timestamp   = jiffies;
2411
2412         rpc_call_setup(&data->task, &msg, 0);
2413 }
2414
2415 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2416 {
2417         struct inode *inode = data->inode;
2418
2419         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2420                 rpc_restart_call(task);
2421                 return -EAGAIN;
2422         }
2423         if (task->tk_status >= 0) {
2424                 renew_lease(NFS_SERVER(inode), data->timestamp);
2425                 nfs_post_op_update_inode(inode, data->res.fattr);
2426         }
2427         return 0;
2428 }
2429
2430 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2431 {
2432         struct rpc_message msg = {
2433                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2434                 .rpc_argp = &data->args,
2435                 .rpc_resp = &data->res,
2436                 .rpc_cred = data->cred,
2437         };
2438         struct inode *inode = data->inode;
2439         struct nfs_server *server = NFS_SERVER(inode);
2440         int stable;
2441
2442         if (how & FLUSH_STABLE) {
2443                 if (!NFS_I(inode)->ncommit)
2444                         stable = NFS_FILE_SYNC;
2445                 else
2446                         stable = NFS_DATA_SYNC;
2447         } else
2448                 stable = NFS_UNSTABLE;
2449         data->args.stable = stable;
2450         data->args.bitmask = server->attr_bitmask;
2451         data->res.server = server;
2452
2453         data->timestamp   = jiffies;
2454
2455         /* Finalize the task. */
2456         rpc_call_setup(&data->task, &msg, 0);
2457 }
2458
2459 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2460 {
2461         struct inode *inode = data->inode;
2462
2463         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2464                 rpc_restart_call(task);
2465                 return -EAGAIN;
2466         }
2467         if (task->tk_status >= 0)
2468                 nfs_post_op_update_inode(inode, data->res.fattr);
2469         return 0;
2470 }
2471
2472 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2473 {
2474         struct rpc_message msg = {
2475                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2476                 .rpc_argp = &data->args,
2477                 .rpc_resp = &data->res,
2478                 .rpc_cred = data->cred,
2479         };
2480         struct nfs_server *server = NFS_SERVER(data->inode);
2481
2482         data->args.bitmask = server->attr_bitmask;
2483         data->res.server = server;
2484
2485         rpc_call_setup(&data->task, &msg, 0);
2486 }
2487
2488 /*
2489  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2490  * standalone procedure for queueing an asynchronous RENEW.
2491  */
2492 static void nfs4_renew_done(struct rpc_task *task, void *data)
2493 {
2494         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2495         unsigned long timestamp = (unsigned long)data;
2496
2497         if (task->tk_status < 0) {
2498                 switch (task->tk_status) {
2499                         case -NFS4ERR_STALE_CLIENTID:
2500                         case -NFS4ERR_EXPIRED:
2501                         case -NFS4ERR_CB_PATH_DOWN:
2502                                 nfs4_schedule_state_recovery(clp);
2503                 }
2504                 return;
2505         }
2506         spin_lock(&clp->cl_lock);
2507         if (time_before(clp->cl_last_renewal,timestamp))
2508                 clp->cl_last_renewal = timestamp;
2509         spin_unlock(&clp->cl_lock);
2510 }
2511
2512 static const struct rpc_call_ops nfs4_renew_ops = {
2513         .rpc_call_done = nfs4_renew_done,
2514 };
2515
2516 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2517 {
2518         struct rpc_message msg = {
2519                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2520                 .rpc_argp       = clp,
2521                 .rpc_cred       = cred,
2522         };
2523
2524         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2525                         &nfs4_renew_ops, (void *)jiffies);
2526 }
2527
2528 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2529 {
2530         struct rpc_message msg = {
2531                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2532                 .rpc_argp       = clp,
2533                 .rpc_cred       = cred,
2534         };
2535         unsigned long now = jiffies;
2536         int status;
2537
2538         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2539         if (status < 0)
2540                 return status;
2541         spin_lock(&clp->cl_lock);
2542         if (time_before(clp->cl_last_renewal,now))
2543                 clp->cl_last_renewal = now;
2544         spin_unlock(&clp->cl_lock);
2545         return 0;
2546 }
2547
2548 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2549 {
2550         return (server->caps & NFS_CAP_ACLS)
2551                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2552                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2553 }
2554
2555 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2556  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2557  * the stack.
2558  */
2559 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2560
2561 static void buf_to_pages(const void *buf, size_t buflen,
2562                 struct page **pages, unsigned int *pgbase)
2563 {
2564         const void *p = buf;
2565
2566         *pgbase = offset_in_page(buf);
2567         p -= *pgbase;
2568         while (p < buf + buflen) {
2569                 *(pages++) = virt_to_page(p);
2570                 p += PAGE_CACHE_SIZE;
2571         }
2572 }
2573
2574 struct nfs4_cached_acl {
2575         int cached;
2576         size_t len;
2577         char data[0];
2578 };
2579
2580 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2581 {
2582         struct nfs_inode *nfsi = NFS_I(inode);
2583
2584         spin_lock(&inode->i_lock);
2585         kfree(nfsi->nfs4_acl);
2586         nfsi->nfs4_acl = acl;
2587         spin_unlock(&inode->i_lock);
2588 }
2589
2590 static void nfs4_zap_acl_attr(struct inode *inode)
2591 {
2592         nfs4_set_cached_acl(inode, NULL);
2593 }
2594
2595 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2596 {
2597         struct nfs_inode *nfsi = NFS_I(inode);
2598         struct nfs4_cached_acl *acl;
2599         int ret = -ENOENT;
2600
2601         spin_lock(&inode->i_lock);
2602         acl = nfsi->nfs4_acl;
2603         if (acl == NULL)
2604                 goto out;
2605         if (buf == NULL) /* user is just asking for length */
2606                 goto out_len;
2607         if (acl->cached == 0)
2608                 goto out;
2609         ret = -ERANGE; /* see getxattr(2) man page */
2610         if (acl->len > buflen)
2611                 goto out;
2612         memcpy(buf, acl->data, acl->len);
2613 out_len:
2614         ret = acl->len;
2615 out:
2616         spin_unlock(&inode->i_lock);
2617         return ret;
2618 }
2619
2620 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2621 {
2622         struct nfs4_cached_acl *acl;
2623
2624         if (buf && acl_len <= PAGE_SIZE) {
2625                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2626                 if (acl == NULL)
2627                         goto out;
2628                 acl->cached = 1;
2629                 memcpy(acl->data, buf, acl_len);
2630         } else {
2631                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2632                 if (acl == NULL)
2633                         goto out;
2634                 acl->cached = 0;
2635         }
2636         acl->len = acl_len;
2637 out:
2638         nfs4_set_cached_acl(inode, acl);
2639 }
2640
2641 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2642 {
2643         struct page *pages[NFS4ACL_MAXPAGES];
2644         struct nfs_getaclargs args = {
2645                 .fh = NFS_FH(inode),
2646                 .acl_pages = pages,
2647                 .acl_len = buflen,
2648         };
2649         size_t resp_len = buflen;
2650         void *resp_buf;
2651         struct rpc_message msg = {
2652                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2653                 .rpc_argp = &args,
2654                 .rpc_resp = &resp_len,
2655         };
2656         struct page *localpage = NULL;
2657         int ret;
2658
2659         if (buflen < PAGE_SIZE) {
2660                 /* As long as we're doing a round trip to the server anyway,
2661                  * let's be prepared for a page of acl data. */
2662                 localpage = alloc_page(GFP_KERNEL);
2663                 resp_buf = page_address(localpage);
2664                 if (localpage == NULL)
2665                         return -ENOMEM;
2666                 args.acl_pages[0] = localpage;
2667                 args.acl_pgbase = 0;
2668                 resp_len = args.acl_len = PAGE_SIZE;
2669         } else {
2670                 resp_buf = buf;
2671                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2672         }
2673         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2674         if (ret)
2675                 goto out_free;
2676         if (resp_len > args.acl_len)
2677                 nfs4_write_cached_acl(inode, NULL, resp_len);
2678         else
2679                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2680         if (buf) {
2681                 ret = -ERANGE;
2682                 if (resp_len > buflen)
2683                         goto out_free;
2684                 if (localpage)
2685                         memcpy(buf, resp_buf, resp_len);
2686         }
2687         ret = resp_len;
2688 out_free:
2689         if (localpage)
2690                 __free_page(localpage);
2691         return ret;
2692 }
2693
2694 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2695 {
2696         struct nfs4_exception exception = { };
2697         ssize_t ret;
2698         do {
2699                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2700                 if (ret >= 0)
2701                         break;
2702                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2703         } while (exception.retry);
2704         return ret;
2705 }
2706
2707 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2708 {
2709         struct nfs_server *server = NFS_SERVER(inode);
2710         int ret;
2711
2712         if (!nfs4_server_supports_acls(server))
2713                 return -EOPNOTSUPP;
2714         ret = nfs_revalidate_inode(server, inode);
2715         if (ret < 0)
2716                 return ret;
2717         ret = nfs4_read_cached_acl(inode, buf, buflen);
2718         if (ret != -ENOENT)
2719                 return ret;
2720         return nfs4_get_acl_uncached(inode, buf, buflen);
2721 }
2722
2723 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2724 {
2725         struct nfs_server *server = NFS_SERVER(inode);
2726         struct page *pages[NFS4ACL_MAXPAGES];
2727         struct nfs_setaclargs arg = {
2728                 .fh             = NFS_FH(inode),
2729                 .acl_pages      = pages,
2730                 .acl_len        = buflen,
2731         };
2732         struct rpc_message msg = {
2733                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2734                 .rpc_argp       = &arg,
2735                 .rpc_resp       = NULL,
2736         };
2737         int ret;
2738
2739         if (!nfs4_server_supports_acls(server))
2740                 return -EOPNOTSUPP;
2741         nfs_inode_return_delegation(inode);
2742         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2743         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2744         nfs_zap_caches(inode);
2745         return ret;
2746 }
2747
2748 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2749 {
2750         struct nfs4_exception exception = { };
2751         int err;
2752         do {
2753                 err = nfs4_handle_exception(NFS_SERVER(inode),
2754                                 __nfs4_proc_set_acl(inode, buf, buflen),
2755                                 &exception);
2756         } while (exception.retry);
2757         return err;
2758 }
2759
2760 static int
2761 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2762 {
2763         struct nfs_client *clp = server->nfs_client;
2764
2765         if (!clp || task->tk_status >= 0)
2766                 return 0;
2767         switch(task->tk_status) {
2768                 case -NFS4ERR_STALE_CLIENTID:
2769                 case -NFS4ERR_STALE_STATEID:
2770                 case -NFS4ERR_EXPIRED:
2771                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2772                         nfs4_schedule_state_recovery(clp);
2773                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2774                                 rpc_wake_up_task(task);
2775                         task->tk_status = 0;
2776                         return -EAGAIN;
2777                 case -NFS4ERR_DELAY:
2778                         nfs_inc_server_stats((struct nfs_server *) server,
2779                                                 NFSIOS_DELAY);
2780                 case -NFS4ERR_GRACE:
2781                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2782                         task->tk_status = 0;
2783                         return -EAGAIN;
2784                 case -NFS4ERR_OLD_STATEID:
2785                         task->tk_status = 0;
2786                         return -EAGAIN;
2787         }
2788         task->tk_status = nfs4_map_errors(task->tk_status);
2789         return 0;
2790 }
2791
2792 static int nfs4_wait_bit_interruptible(void *word)
2793 {
2794         if (signal_pending(current))
2795                 return -ERESTARTSYS;
2796         schedule();
2797         return 0;
2798 }
2799
2800 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2801 {
2802         sigset_t oldset;
2803         int res;
2804
2805         might_sleep();
2806
2807         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2808
2809         rpc_clnt_sigmask(clnt, &oldset);
2810         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2811                         nfs4_wait_bit_interruptible,
2812                         TASK_INTERRUPTIBLE);
2813         rpc_clnt_sigunmask(clnt, &oldset);
2814
2815         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2816         return res;
2817 }
2818
2819 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2820 {
2821         sigset_t oldset;
2822         int res = 0;
2823
2824         might_sleep();
2825
2826         if (*timeout <= 0)
2827                 *timeout = NFS4_POLL_RETRY_MIN;
2828         if (*timeout > NFS4_POLL_RETRY_MAX)
2829                 *timeout = NFS4_POLL_RETRY_MAX;
2830         rpc_clnt_sigmask(clnt, &oldset);
2831         if (clnt->cl_intr) {
2832                 schedule_timeout_interruptible(*timeout);
2833                 if (signalled())
2834                         res = -ERESTARTSYS;
2835         } else
2836                 schedule_timeout_uninterruptible(*timeout);
2837         rpc_clnt_sigunmask(clnt, &oldset);
2838         *timeout <<= 1;
2839         return res;
2840 }
2841
2842 /* This is the error handling routine for processes that are allowed
2843  * to sleep.
2844  */
2845 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2846 {
2847         struct nfs_client *clp = server->nfs_client;
2848         int ret = errorcode;
2849
2850         exception->retry = 0;
2851         switch(errorcode) {
2852                 case 0:
2853                         return 0;
2854                 case -NFS4ERR_STALE_CLIENTID:
2855                 case -NFS4ERR_STALE_STATEID:
2856                 case -NFS4ERR_EXPIRED:
2857                         nfs4_schedule_state_recovery(clp);
2858                         ret = nfs4_wait_clnt_recover(server->client, clp);
2859                         if (ret == 0)
2860                                 exception->retry = 1;
2861                         break;
2862                 case -NFS4ERR_FILE_OPEN:
2863                 case -NFS4ERR_GRACE:
2864                 case -NFS4ERR_DELAY:
2865                         ret = nfs4_delay(server->client, &exception->timeout);
2866                         if (ret != 0)
2867                                 break;
2868                 case -NFS4ERR_OLD_STATEID:
2869                         exception->retry = 1;
2870         }
2871         /* We failed to handle the error */
2872         return nfs4_map_errors(ret);
2873 }
2874
2875 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2876 {
2877         nfs4_verifier sc_verifier;
2878         struct nfs4_setclientid setclientid = {
2879                 .sc_verifier = &sc_verifier,
2880                 .sc_prog = program,
2881         };
2882         struct rpc_message msg = {
2883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2884                 .rpc_argp = &setclientid,
2885                 .rpc_resp = clp,
2886                 .rpc_cred = cred,
2887         };
2888         __be32 *p;
2889         int loop = 0;
2890         int status;
2891
2892         p = (__be32*)sc_verifier.data;
2893         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2894         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2895
2896         for(;;) {
2897                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2898                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2899                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2900                                 cred->cr_ops->cr_name,
2901                                 clp->cl_id_uniquifier);
2902                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2903                                 sizeof(setclientid.sc_netid), "tcp");
2904                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2905                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2906                                 clp->cl_ipaddr, port >> 8, port & 255);
2907
2908                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2909                 if (status != -NFS4ERR_CLID_INUSE)
2910                         break;
2911                 if (signalled())
2912                         break;
2913                 if (loop++ & 1)
2914                         ssleep(clp->cl_lease_time + 1);
2915                 else
2916                         if (++clp->cl_id_uniquifier == 0)
2917                                 break;
2918         }
2919         return status;
2920 }
2921
2922 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2923 {
2924         struct nfs_fsinfo fsinfo;
2925         struct rpc_message msg = {
2926                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2927                 .rpc_argp = clp,
2928                 .rpc_resp = &fsinfo,
2929                 .rpc_cred = cred,
2930         };
2931         unsigned long now;
2932         int status;
2933
2934         now = jiffies;
2935         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2936         if (status == 0) {
2937                 spin_lock(&clp->cl_lock);
2938                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2939                 clp->cl_last_renewal = now;
2940                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2941                 spin_unlock(&clp->cl_lock);
2942         }
2943         return status;
2944 }
2945
2946 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2947 {
2948         long timeout;
2949         int err;
2950         do {
2951                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2952                 switch (err) {
2953                         case 0:
2954                                 return err;
2955                         case -NFS4ERR_RESOURCE:
2956                                 /* The IBM lawyers misread another document! */
2957                         case -NFS4ERR_DELAY:
2958                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2959                 }
2960         } while (err == 0);
2961         return err;
2962 }
2963
2964 struct nfs4_delegreturndata {
2965         struct nfs4_delegreturnargs args;
2966         struct nfs4_delegreturnres res;
2967         struct nfs_fh fh;
2968         nfs4_stateid stateid;
2969         struct rpc_cred *cred;
2970         unsigned long timestamp;
2971         struct nfs_fattr fattr;
2972         int rpc_status;
2973 };
2974
2975 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2976 {
2977         struct nfs4_delegreturndata *data = calldata;
2978         struct rpc_message msg = {
2979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2980                 .rpc_argp = &data->args,
2981                 .rpc_resp = &data->res,
2982                 .rpc_cred = data->cred,
2983         };
2984         nfs_fattr_init(data->res.fattr);
2985         rpc_call_setup(task, &msg, 0);
2986 }
2987
2988 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2989 {
2990         struct nfs4_delegreturndata *data = calldata;
2991         data->rpc_status = task->tk_status;
2992         if (data->rpc_status == 0)
2993                 renew_lease(data->res.server, data->timestamp);
2994 }
2995
2996 static void nfs4_delegreturn_release(void *calldata)
2997 {
2998         struct nfs4_delegreturndata *data = calldata;
2999
3000         put_rpccred(data->cred);
3001         kfree(calldata);
3002 }
3003
3004 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3005         .rpc_call_prepare = nfs4_delegreturn_prepare,
3006         .rpc_call_done = nfs4_delegreturn_done,
3007         .rpc_release = nfs4_delegreturn_release,
3008 };
3009
3010 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3011 {
3012         struct nfs4_delegreturndata *data;
3013         struct nfs_server *server = NFS_SERVER(inode);
3014         struct rpc_task *task;
3015         int status;
3016
3017         data = kmalloc(sizeof(*data), GFP_KERNEL);
3018         if (data == NULL)
3019                 return -ENOMEM;
3020         data->args.fhandle = &data->fh;
3021         data->args.stateid = &data->stateid;
3022         data->args.bitmask = server->attr_bitmask;
3023         nfs_copy_fh(&data->fh, NFS_FH(inode));
3024         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3025         data->res.fattr = &data->fattr;
3026         data->res.server = server;
3027         data->cred = get_rpccred(cred);
3028         data->timestamp = jiffies;
3029         data->rpc_status = 0;
3030
3031         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3032         if (IS_ERR(task))
3033                 return PTR_ERR(task);
3034         status = nfs4_wait_for_completion_rpc_task(task);
3035         if (status == 0) {
3036                 status = data->rpc_status;
3037                 if (status == 0)
3038                         nfs_post_op_update_inode(inode, &data->fattr);
3039         }
3040         rpc_put_task(task);
3041         return status;
3042 }
3043
3044 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3045 {
3046         struct nfs_server *server = NFS_SERVER(inode);
3047         struct nfs4_exception exception = { };
3048         int err;
3049         do {
3050                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3051                 switch (err) {
3052                         case -NFS4ERR_STALE_STATEID:
3053                         case -NFS4ERR_EXPIRED:
3054                         case 0:
3055                                 return 0;
3056                 }
3057                 err = nfs4_handle_exception(server, err, &exception);
3058         } while (exception.retry);
3059         return err;
3060 }
3061
3062 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3063 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3064
3065 /*
3066  * sleep, with exponential backoff, and retry the LOCK operation.
3067  */
3068 static unsigned long
3069 nfs4_set_lock_task_retry(unsigned long timeout)
3070 {
3071         schedule_timeout_interruptible(timeout);
3072         timeout <<= 1;
3073         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3074                 return NFS4_LOCK_MAXTIMEOUT;
3075         return timeout;
3076 }
3077
3078 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3079 {
3080         struct inode *inode = state->inode;
3081         struct nfs_server *server = NFS_SERVER(inode);
3082         struct nfs_client *clp = server->nfs_client;
3083         struct nfs_lockt_args arg = {
3084                 .fh = NFS_FH(inode),
3085                 .fl = request,
3086         };
3087         struct nfs_lockt_res res = {
3088                 .denied = request,
3089         };
3090         struct rpc_message msg = {
3091                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3092                 .rpc_argp       = &arg,
3093                 .rpc_resp       = &res,
3094                 .rpc_cred       = state->owner->so_cred,
3095         };
3096         struct nfs4_lock_state *lsp;
3097         int status;
3098
3099         down_read(&clp->cl_sem);
3100         arg.lock_owner.clientid = clp->cl_clientid;
3101         status = nfs4_set_lock_state(state, request);
3102         if (status != 0)
3103                 goto out;
3104         lsp = request->fl_u.nfs4_fl.owner;
3105         arg.lock_owner.id = lsp->ls_id.id;
3106         status = rpc_call_sync(server->client, &msg, 0);
3107         switch (status) {
3108                 case 0:
3109                         request->fl_type = F_UNLCK;
3110                         break;
3111                 case -NFS4ERR_DENIED:
3112                         status = 0;
3113         }
3114         request->fl_ops->fl_release_private(request);
3115 out:
3116         up_read(&clp->cl_sem);
3117         return status;
3118 }
3119
3120 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3121 {
3122         struct nfs4_exception exception = { };
3123         int err;
3124
3125         do {
3126                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3127                                 _nfs4_proc_getlk(state, cmd, request),
3128                                 &exception);
3129         } while (exception.retry);
3130         return err;
3131 }
3132
3133 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3134 {
3135         int res = 0;
3136         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3137                 case FL_POSIX:
3138                         res = posix_lock_file_wait(file, fl);
3139                         break;
3140                 case FL_FLOCK:
3141                         res = flock_lock_file_wait(file, fl);
3142                         break;
3143                 default:
3144                         BUG();
3145         }
3146         return res;
3147 }
3148
3149 struct nfs4_unlockdata {
3150         struct nfs_locku_args arg;
3151         struct nfs_locku_res res;
3152         struct nfs4_lock_state *lsp;
3153         struct nfs_open_context *ctx;
3154         struct file_lock fl;
3155         const struct nfs_server *server;
3156         unsigned long timestamp;
3157 };
3158
3159 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3160                 struct nfs_open_context *ctx,
3161                 struct nfs4_lock_state *lsp,
3162                 struct nfs_seqid *seqid)
3163 {
3164         struct nfs4_unlockdata *p;
3165         struct inode *inode = lsp->ls_state->inode;
3166
3167         p = kmalloc(sizeof(*p), GFP_KERNEL);
3168         if (p == NULL)
3169                 return NULL;
3170         p->arg.fh = NFS_FH(inode);
3171         p->arg.fl = &p->fl;
3172         p->arg.seqid = seqid;
3173         p->arg.stateid = &lsp->ls_stateid;
3174         p->lsp = lsp;
3175         atomic_inc(&lsp->ls_count);
3176         /* Ensure we don't close file until we're done freeing locks! */
3177         p->ctx = get_nfs_open_context(ctx);
3178         memcpy(&p->fl, fl, sizeof(p->fl));
3179         p->server = NFS_SERVER(inode);
3180         return p;
3181 }
3182
3183 static void nfs4_locku_release_calldata(void *data)
3184 {
3185         struct nfs4_unlockdata *calldata = data;
3186         nfs_free_seqid(calldata->arg.seqid);
3187         nfs4_put_lock_state(calldata->lsp);
3188         put_nfs_open_context(calldata->ctx);
3189         kfree(calldata);
3190 }
3191
3192 static void nfs4_locku_done(struct rpc_task *task, void *data)
3193 {
3194         struct nfs4_unlockdata *calldata = data;
3195
3196         if (RPC_ASSASSINATED(task))
3197                 return;
3198         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3199         switch (task->tk_status) {
3200                 case 0:
3201                         memcpy(calldata->lsp->ls_stateid.data,
3202                                         calldata->res.stateid.data,
3203                                         sizeof(calldata->lsp->ls_stateid.data));
3204                         renew_lease(calldata->server, calldata->timestamp);
3205                         break;
3206                 case -NFS4ERR_STALE_STATEID:
3207                 case -NFS4ERR_EXPIRED:
3208                         break;
3209                 default:
3210                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3211                                 rpc_restart_call(task);
3212         }
3213 }
3214
3215 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3216 {
3217         struct nfs4_unlockdata *calldata = data;
3218         struct rpc_message msg = {
3219                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3220                 .rpc_argp       = &calldata->arg,
3221                 .rpc_resp       = &calldata->res,
3222                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3223         };
3224
3225         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3226                 return;
3227         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3228                 /* Note: exit _without_ running nfs4_locku_done */
3229                 task->tk_action = NULL;
3230                 return;
3231         }
3232         calldata->timestamp = jiffies;
3233         rpc_call_setup(task, &msg, 0);
3234 }
3235
3236 static const struct rpc_call_ops nfs4_locku_ops = {
3237         .rpc_call_prepare = nfs4_locku_prepare,
3238         .rpc_call_done = nfs4_locku_done,
3239         .rpc_release = nfs4_locku_release_calldata,
3240 };
3241
3242 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3243                 struct nfs_open_context *ctx,
3244                 struct nfs4_lock_state *lsp,
3245                 struct nfs_seqid *seqid)
3246 {
3247         struct nfs4_unlockdata *data;
3248
3249         /* Ensure this is an unlock - when canceling a lock, the
3250          * canceled lock is passed in, and it won't be an unlock.
3251          */
3252         fl->fl_type = F_UNLCK;
3253
3254         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3255         if (data == NULL) {
3256                 nfs_free_seqid(seqid);
3257                 return ERR_PTR(-ENOMEM);
3258         }
3259
3260         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3261 }
3262
3263 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3264 {
3265         struct nfs_seqid *seqid;
3266         struct nfs4_lock_state *lsp;
3267         struct rpc_task *task;
3268         int status = 0;
3269
3270         status = nfs4_set_lock_state(state, request);
3271         /* Unlock _before_ we do the RPC call */
3272         request->fl_flags |= FL_EXISTS;
3273         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3274                 goto out;
3275         if (status != 0)
3276                 goto out;
3277         /* Is this a delegated lock? */
3278         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3279                 goto out;
3280         lsp = request->fl_u.nfs4_fl.owner;
3281         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3282         status = -ENOMEM;
3283         if (seqid == NULL)
3284                 goto out;
3285         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3286         status = PTR_ERR(task);
3287         if (IS_ERR(task))
3288                 goto out;
3289         status = nfs4_wait_for_completion_rpc_task(task);
3290         rpc_put_task(task);
3291 out:
3292         return status;
3293 }
3294
3295 struct nfs4_lockdata {
3296         struct nfs_lock_args arg;
3297         struct nfs_lock_res res;
3298         struct nfs4_lock_state *lsp;
3299         struct nfs_open_context *ctx;
3300         struct file_lock fl;
3301         unsigned long timestamp;
3302         int rpc_status;
3303         int cancelled;
3304 };
3305
3306 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3307                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3308 {
3309         struct nfs4_lockdata *p;
3310         struct inode *inode = lsp->ls_state->inode;
3311         struct nfs_server *server = NFS_SERVER(inode);
3312
3313         p = kzalloc(sizeof(*p), GFP_KERNEL);
3314         if (p == NULL)
3315                 return NULL;
3316
3317         p->arg.fh = NFS_FH(inode);
3318         p->arg.fl = &p->fl;
3319         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3320         if (p->arg.lock_seqid == NULL)
3321                 goto out_free;
3322         p->arg.lock_stateid = &lsp->ls_stateid;
3323         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3324         p->arg.lock_owner.id = lsp->ls_id.id;
3325         p->lsp = lsp;
3326         atomic_inc(&lsp->ls_count);
3327         p->ctx = get_nfs_open_context(ctx);
3328         memcpy(&p->fl, fl, sizeof(p->fl));
3329         return p;
3330 out_free:
3331         kfree(p);
3332         return NULL;
3333 }
3334
3335 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3336 {
3337         struct nfs4_lockdata *data = calldata;
3338         struct nfs4_state *state = data->lsp->ls_state;
3339         struct nfs4_state_owner *sp = state->owner;
3340         struct rpc_message msg = {
3341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3342                 .rpc_argp = &data->arg,
3343                 .rpc_resp = &data->res,
3344                 .rpc_cred = sp->so_cred,
3345         };
3346
3347         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3348                 return;
3349         dprintk("%s: begin!\n", __FUNCTION__);
3350         /* Do we need to do an open_to_lock_owner? */
3351         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3352                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3353                 if (data->arg.open_seqid == NULL) {
3354                         data->rpc_status = -ENOMEM;
3355                         task->tk_action = NULL;
3356                         goto out;
3357                 }
3358                 data->arg.open_stateid = &state->stateid;
3359                 data->arg.new_lock_owner = 1;
3360         }
3361         data->timestamp = jiffies;
3362         rpc_call_setup(task, &msg, 0);
3363 out:
3364         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3365 }
3366
3367 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3368 {
3369         struct nfs4_lockdata *data = calldata;
3370
3371         dprintk("%s: begin!\n", __FUNCTION__);
3372
3373         data->rpc_status = task->tk_status;
3374         if (RPC_ASSASSINATED(task))
3375                 goto out;
3376         if (data->arg.new_lock_owner != 0) {
3377                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3378                 if (data->rpc_status == 0)
3379                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3380                 else
3381                         goto out;
3382         }
3383         if (data->rpc_status == 0) {
3384                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3385                                         sizeof(data->lsp->ls_stateid.data));
3386                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3387                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3388         }
3389         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3390 out:
3391         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3392 }
3393
3394 static void nfs4_lock_release(void *calldata)
3395 {
3396         struct nfs4_lockdata *data = calldata;
3397
3398         dprintk("%s: begin!\n", __FUNCTION__);
3399         if (data->arg.open_seqid != NULL)
3400                 nfs_free_seqid(data->arg.open_seqid);
3401         if (data->cancelled != 0) {
3402                 struct rpc_task *task;
3403                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3404                                 data->arg.lock_seqid);
3405                 if (!IS_ERR(task))
3406                         rpc_put_task(task);
3407                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3408         } else
3409                 nfs_free_seqid(data->arg.lock_seqid);
3410         nfs4_put_lock_state(data->lsp);
3411         put_nfs_open_context(data->ctx);
3412         kfree(data);
3413         dprintk("%s: done!\n", __FUNCTION__);
3414 }
3415
3416 static const struct rpc_call_ops nfs4_lock_ops = {
3417         .rpc_call_prepare = nfs4_lock_prepare,
3418         .rpc_call_done = nfs4_lock_done,
3419         .rpc_release = nfs4_lock_release,
3420 };
3421
3422 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3423 {
3424         struct nfs4_lockdata *data;
3425         struct rpc_task *task;
3426         int ret;
3427
3428         dprintk("%s: begin!\n", __FUNCTION__);
3429         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3430                         fl->fl_u.nfs4_fl.owner);
3431         if (data == NULL)
3432                 return -ENOMEM;
3433         if (IS_SETLKW(cmd))
3434                 data->arg.block = 1;
3435         if (reclaim != 0)
3436                 data->arg.reclaim = 1;
3437         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3438                         &nfs4_lock_ops, data);
3439         if (IS_ERR(task))
3440                 return PTR_ERR(task);
3441         ret = nfs4_wait_for_completion_rpc_task(task);
3442         if (ret == 0) {
3443                 ret = data->rpc_status;
3444                 if (ret == -NFS4ERR_DENIED)
3445                         ret = -EAGAIN;
3446         } else
3447                 data->cancelled = 1;
3448         rpc_put_task(task);
3449         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3450         return ret;
3451 }
3452
3453 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3454 {
3455         struct nfs_server *server = NFS_SERVER(state->inode);
3456         struct nfs4_exception exception = { };
3457         int err;
3458
3459         do {
3460                 /* Cache the lock if possible... */
3461                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3462                         return 0;
3463                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3464                 if (err != -NFS4ERR_DELAY)
3465                         break;
3466                 nfs4_handle_exception(server, err, &exception);
3467         } while (exception.retry);
3468         return err;
3469 }
3470
3471 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3472 {
3473         struct nfs_server *server = NFS_SERVER(state->inode);
3474         struct nfs4_exception exception = { };
3475         int err;
3476
3477         err = nfs4_set_lock_state(state, request);
3478         if (err != 0)
3479                 return err;
3480         do {
3481                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3482                         return 0;
3483                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3484                 if (err != -NFS4ERR_DELAY)
3485                         break;
3486                 nfs4_handle_exception(server, err, &exception);
3487         } while (exception.retry);
3488         return err;
3489 }
3490
3491 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3492 {
3493         struct nfs_client *clp = state->owner->so_client;
3494         unsigned char fl_flags = request->fl_flags;
3495         int status;
3496
3497         /* Is this a delegated open? */
3498         status = nfs4_set_lock_state(state, request);
3499         if (status != 0)
3500                 goto out;
3501         request->fl_flags |= FL_ACCESS;
3502         status = do_vfs_lock(request->fl_file, request);
3503         if (status < 0)
3504                 goto out;
3505         down_read(&clp->cl_sem);
3506         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3507                 struct nfs_inode *nfsi = NFS_I(state->inode);
3508                 /* Yes: cache locks! */
3509                 down_read(&nfsi->rwsem);
3510                 /* ...but avoid races with delegation recall... */
3511                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3512                         request->fl_flags = fl_flags & ~FL_SLEEP;
3513                         status = do_vfs_lock(request->fl_file, request);
3514                         up_read(&nfsi->rwsem);
3515                         goto out_unlock;
3516                 }
3517                 up_read(&nfsi->rwsem);
3518         }
3519         status = _nfs4_do_setlk(state, cmd, request, 0);
3520         if (status != 0)
3521                 goto out_unlock;
3522         /* Note: we always want to sleep here! */
3523         request->fl_flags = fl_flags | FL_SLEEP;
3524         if (do_vfs_lock(request->fl_file, request) < 0)
3525                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3526 out_unlock:
3527         up_read(&clp->cl_sem);
3528 out:
3529         request->fl_flags = fl_flags;
3530         return status;
3531 }
3532
3533 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3534 {
3535         struct nfs4_exception exception = { };
3536         int err;
3537
3538         do {
3539                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3540                                 _nfs4_proc_setlk(state, cmd, request),
3541                                 &exception);
3542         } while (exception.retry);
3543         return err;
3544 }
3545
3546 static int
3547 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3548 {
3549         struct nfs_open_context *ctx;
3550         struct nfs4_state *state;
3551         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3552         int status;
3553
3554         /* verify open state */
3555         ctx = nfs_file_open_context(filp);
3556         state = ctx->state;
3557
3558         if (request->fl_start < 0 || request->fl_end < 0)
3559                 return -EINVAL;
3560
3561         if (IS_GETLK(cmd))
3562                 return nfs4_proc_getlk(state, F_GETLK, request);
3563
3564         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3565                 return -EINVAL;
3566
3567         if (request->fl_type == F_UNLCK)
3568                 return nfs4_proc_unlck(state, cmd, request);
3569
3570         do {
3571                 status = nfs4_proc_setlk(state, cmd, request);
3572                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3573                         break;
3574                 timeout = nfs4_set_lock_task_retry(timeout);
3575                 status = -ERESTARTSYS;
3576                 if (signalled())
3577                         break;
3578         } while(status < 0);
3579         return status;
3580 }
3581
3582 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3583 {
3584         struct nfs_server *server = NFS_SERVER(state->inode);
3585         struct nfs4_exception exception = { };
3586         int err;
3587
3588         err = nfs4_set_lock_state(state, fl);
3589         if (err != 0)
3590                 goto out;
3591         do {
3592                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3593                 if (err != -NFS4ERR_DELAY)
3594                         break;
3595                 err = nfs4_handle_exception(server, err, &exception);
3596         } while (exception.retry);
3597 out:
3598         return err;
3599 }
3600
3601 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3602
3603 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3604                 size_t buflen, int flags)
3605 {
3606         struct inode *inode = dentry->d_inode;
3607
3608         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3609                 return -EOPNOTSUPP;
3610
3611         if (!S_ISREG(inode->i_mode) &&
3612             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3613                 return -EPERM;
3614
3615         return nfs4_proc_set_acl(inode, buf, buflen);
3616 }
3617
3618 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3619  * and that's what we'll do for e.g. user attributes that haven't been set.
3620  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3621  * attributes in kernel-managed attribute namespaces. */
3622 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3623                 size_t buflen)
3624 {
3625         struct inode *inode = dentry->d_inode;
3626
3627         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3628                 return -EOPNOTSUPP;
3629
3630         return nfs4_proc_get_acl(inode, buf, buflen);
3631 }
3632
3633 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3634 {
3635         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3636
3637         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3638                 return 0;
3639         if (buf && buflen < len)
3640                 return -ERANGE;
3641         if (buf)
3642                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3643         return len;
3644 }
3645
3646 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3647                 struct nfs4_fs_locations *fs_locations, struct page *page)
3648 {
3649         struct nfs_server *server = NFS_SERVER(dir);
3650         u32 bitmask[2] = {
3651                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3652                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3653         };
3654         struct nfs4_fs_locations_arg args = {
3655                 .dir_fh = NFS_FH(dir),
3656                 .name = name,
3657                 .page = page,
3658                 .bitmask = bitmask,
3659         };
3660         struct rpc_message msg = {
3661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3662                 .rpc_argp = &args,
3663                 .rpc_resp = fs_locations,
3664         };
3665         int status;
3666
3667         dprintk("%s: start\n", __FUNCTION__);
3668         nfs_fattr_init(&fs_locations->fattr);
3669         fs_locations->server = server;
3670         fs_locations->nlocations = 0;
3671         status = rpc_call_sync(server->client, &msg, 0);
3672         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3673         return status;
3674 }
3675
3676 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3677         .recover_open   = nfs4_open_reclaim,
3678         .recover_lock   = nfs4_lock_reclaim,
3679 };
3680
3681 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3682         .recover_open   = nfs4_open_expired,
3683         .recover_lock   = nfs4_lock_expired,
3684 };
3685
3686 static const struct inode_operations nfs4_file_inode_operations = {
3687         .permission     = nfs_permission,
3688         .getattr        = nfs_getattr,
3689         .setattr        = nfs_setattr,
3690         .getxattr       = nfs4_getxattr,
3691         .setxattr       = nfs4_setxattr,
3692         .listxattr      = nfs4_listxattr,
3693 };
3694
3695 const struct nfs_rpc_ops nfs_v4_clientops = {
3696         .version        = 4,                    /* protocol version */
3697         .dentry_ops     = &nfs4_dentry_operations,
3698         .dir_inode_ops  = &nfs4_dir_inode_operations,
3699         .file_inode_ops = &nfs4_file_inode_operations,
3700         .getroot        = nfs4_proc_get_root,
3701         .getattr        = nfs4_proc_getattr,
3702         .setattr        = nfs4_proc_setattr,
3703         .lookupfh       = nfs4_proc_lookupfh,
3704         .lookup         = nfs4_proc_lookup,
3705         .access         = nfs4_proc_access,
3706         .readlink       = nfs4_proc_readlink,
3707         .create         = nfs4_proc_create,
3708         .remove         = nfs4_proc_remove,
3709         .unlink_setup   = nfs4_proc_unlink_setup,
3710         .unlink_done    = nfs4_proc_unlink_done,
3711         .rename         = nfs4_proc_rename,
3712         .link           = nfs4_proc_link,
3713         .symlink        = nfs4_proc_symlink,
3714         .mkdir          = nfs4_proc_mkdir,
3715         .rmdir          = nfs4_proc_remove,
3716         .readdir        = nfs4_proc_readdir,
3717         .mknod          = nfs4_proc_mknod,
3718         .statfs         = nfs4_proc_statfs,
3719         .fsinfo         = nfs4_proc_fsinfo,
3720         .pathconf       = nfs4_proc_pathconf,
3721         .set_capabilities = nfs4_server_capabilities,
3722         .decode_dirent  = nfs4_decode_dirent,
3723         .read_setup     = nfs4_proc_read_setup,
3724         .read_done      = nfs4_read_done,
3725         .write_setup    = nfs4_proc_write_setup,
3726         .write_done     = nfs4_write_done,
3727         .commit_setup   = nfs4_proc_commit_setup,
3728         .commit_done    = nfs4_commit_done,
3729         .file_open      = nfs_open,
3730         .file_release   = nfs_release,
3731         .lock           = nfs4_proc_lock,
3732         .clear_acl_cache = nfs4_zap_acl_attr,
3733 };
3734
3735 /*
3736  * Local variables:
3737  *  c-basic-offset: 8
3738  * End:
3739  */