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   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         if (cinfo->after != nfsi->change_attr) {
 212                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 213                 if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 214                         nfsi->cache_change_attribute = jiffies;
 215                 nfsi->change_attr = cinfo->after;
 216         }
 217         spin_unlock(&dir->i_lock);
 218 }
 219
 220 struct nfs4_opendata {
 221         struct kref kref;
 222         struct nfs_openargs o_arg;
 223         struct nfs_openres o_res;
 224         struct nfs_open_confirmargs c_arg;
 225         struct nfs_open_confirmres c_res;
 226         struct nfs_fattr f_attr;
 227         struct nfs_fattr dir_attr;
 228         struct path path;
 229         struct dentry *dir;
 230         struct nfs4_state_owner *owner;
 231         struct nfs4_state *state;
 232         struct iattr attrs;
 233         unsigned long timestamp;
 234         unsigned int rpc_done : 1;
 235         int rpc_status;
 236         int cancelled;
 237 };
 238
 239
 240 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 241 {
 242         p->o_res.f_attr = &p->f_attr;
 243         p->o_res.dir_attr = &p->dir_attr;
 244         p->o_res.server = p->o_arg.server;
 245         nfs_fattr_init(&p->f_attr);
 246         nfs_fattr_init(&p->dir_attr);
 247 }
 248
 249 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 250                 struct nfs4_state_owner *sp, int flags,
 251                 const struct iattr *attrs)
 252 {
 253         struct dentry *parent = dget_parent(path->dentry);
 254         struct inode *dir = parent->d_inode;
 255         struct nfs_server *server = NFS_SERVER(dir);
 256         struct nfs4_opendata *p;
 257
 258         p = kzalloc(sizeof(*p), GFP_KERNEL);
 259         if (p == NULL)
 260                 goto err;
 261         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 262         if (p->o_arg.seqid == NULL)
 263                 goto err_free;
 264         p->path.mnt = mntget(path->mnt);
 265         p->path.dentry = dget(path->dentry);
 266         p->dir = parent;
 267         p->owner = sp;
 268         atomic_inc(&sp->so_count);
 269         p->o_arg.fh = NFS_FH(dir);
 270         p->o_arg.open_flags = flags,
 271         p->o_arg.clientid = server->nfs_client->cl_clientid;
 272         p->o_arg.id = sp->so_owner_id.id;
 273         p->o_arg.name = &p->path.dentry->d_name;
 274         p->o_arg.server = server;
 275         p->o_arg.bitmask = server->attr_bitmask;
 276         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 277         if (flags & O_EXCL) {
 278                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 279                 s[0] = jiffies;
 280                 s[1] = current->pid;
 281         } else if (flags & O_CREAT) {
 282                 p->o_arg.u.attrs = &p->attrs;
 283                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 284         }
 285         p->c_arg.fh = &p->o_res.fh;
 286         p->c_arg.stateid = &p->o_res.stateid;
 287         p->c_arg.seqid = p->o_arg.seqid;
 288         nfs4_init_opendata_res(p);
 289         kref_init(&p->kref);
 290         return p;
 291 err_free:
 292         kfree(p);
 293 err:
 294         dput(parent);
 295         return NULL;
 296 }
 297
 298 static void nfs4_opendata_free(struct kref *kref)
 299 {
 300         struct nfs4_opendata *p = container_of(kref,
 301                         struct nfs4_opendata, kref);
 302
 303         nfs_free_seqid(p->o_arg.seqid);
 304         if (p->state != NULL)
 305                 nfs4_put_open_state(p->state);
 306         nfs4_put_state_owner(p->owner);
 307         dput(p->dir);
 308         dput(p->path.dentry);
 309         mntput(p->path.mnt);
 310         kfree(p);
 311 }
 312
 313 static void nfs4_opendata_put(struct nfs4_opendata *p)
 314 {
 315         if (p != NULL)
 316                 kref_put(&p->kref, nfs4_opendata_free);
 317 }
 318
 319 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 320 {
 321         sigset_t oldset;
 322         int ret;
 323
 324         rpc_clnt_sigmask(task->tk_client, &oldset);
 325         ret = rpc_wait_for_completion_task(task);
 326         rpc_clnt_sigunmask(task->tk_client, &oldset);
 327         return ret;
 328 }
 329
 330 static int can_open_cached(struct nfs4_state *state, int mode)
 331 {
 332         int ret = 0;
 333         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 334                 case FMODE_READ:
 335                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 336                         break;
 337                 case FMODE_WRITE:
 338                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 339                         break;
 340                 case FMODE_READ|FMODE_WRITE:
 341                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 342         }
 343         return ret;
 344 }
 345
 346 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 347 {
 348         if ((delegation->type & open_flags) != open_flags)
 349                 return 0;
 350         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 351                 return 0;
 352         return 1;
 353 }
 354
 355 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 356 {
 357         switch (open_flags) {
 358                 case FMODE_WRITE:
 359                         state->n_wronly++;
 360                         break;
 361                 case FMODE_READ:
 362                         state->n_rdonly++;
 363                         break;
 364                 case FMODE_READ|FMODE_WRITE:
 365                         state->n_rdwr++;
 366         }
 367         nfs4_state_set_mode_locked(state, state->state | open_flags);
 368 }
 369
 370 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 371 {
 372         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 373                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 374         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 375         switch (open_flags) {
 376                 case FMODE_READ:
 377                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 378                         break;
 379                 case FMODE_WRITE:
 380                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 381                         break;
 382                 case FMODE_READ|FMODE_WRITE:
 383                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 384         }
 385 }
 386
 387 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 388 {
 389         write_seqlock(&state->seqlock);
 390         nfs_set_open_stateid_locked(state, stateid, open_flags);
 391         write_sequnlock(&state->seqlock);
 392 }
 393
 394 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 395 {
 396         open_flags &= (FMODE_READ|FMODE_WRITE);
 397         /*
 398          * Protect the call to nfs4_state_set_mode_locked and
 399          * serialise the stateid update
 400          */
 401         write_seqlock(&state->seqlock);
 402         if (deleg_stateid != NULL) {
 403                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 404                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 405         }
 406         if (open_stateid != NULL)
 407                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 408         write_sequnlock(&state->seqlock);
 409         spin_lock(&state->owner->so_lock);
 410         update_open_stateflags(state, open_flags);
 411         spin_unlock(&state->owner->so_lock);
 412 }
 413
 414 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 415 {
 416         struct nfs_delegation *delegation;
 417
 418         rcu_read_lock();
 419         delegation = rcu_dereference(NFS_I(inode)->delegation);
 420         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 421                 rcu_read_unlock();
 422                 return;
 423         }
 424         rcu_read_unlock();
 425         nfs_inode_return_delegation(inode);
 426 }
 427
 428 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 429 {
 430         struct nfs4_state *state = opendata->state;
 431         struct nfs_inode *nfsi = NFS_I(state->inode);
 432         struct nfs_delegation *delegation;
 433         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 434         nfs4_stateid stateid;
 435         int ret = -EAGAIN;
 436
 437         rcu_read_lock();
 438         delegation = rcu_dereference(nfsi->delegation);
 439         for (;;) {
 440                 if (can_open_cached(state, open_mode)) {
 441                         spin_lock(&state->owner->so_lock);
 442                         if (can_open_cached(state, open_mode)) {
 443                                 update_open_stateflags(state, open_mode);
 444                                 spin_unlock(&state->owner->so_lock);
 445                                 rcu_read_unlock();
 446                                 goto out_return_state;
 447                         }
 448                         spin_unlock(&state->owner->so_lock);
 449                 }
 450                 if (delegation == NULL)
 451                         break;
 452                 if (!can_open_delegated(delegation, open_mode))
 453                         break;
 454                 /* Save the delegation */
 455                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 456                 rcu_read_unlock();
 457                 lock_kernel();
 458                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 459                 unlock_kernel();
 460                 if (ret != 0)
 461                         goto out;
 462                 ret = -EAGAIN;
 463                 rcu_read_lock();
 464                 delegation = rcu_dereference(nfsi->delegation);
 465                 /* If no delegation, try a cached open */
 466                 if (delegation == NULL)
 467                         continue;
 468                 /* Is the delegation still valid? */
 469                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 470                         continue;
 471                 rcu_read_unlock();
 472                 update_open_stateid(state, NULL, &stateid, open_mode);
 473                 goto out_return_state;
 474         }
 475         rcu_read_unlock();
 476 out:
 477         return ERR_PTR(ret);
 478 out_return_state:
 479         atomic_inc(&state->count);
 480         return state;
 481 }
 482
 483 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 484 {
 485         struct inode *inode;
 486         struct nfs4_state *state = NULL;
 487         struct nfs_delegation *delegation;
 488         nfs4_stateid *deleg_stateid = NULL;
 489         int ret;
 490
 491         if (!data->rpc_done) {
 492                 state = nfs4_try_open_cached(data);
 493                 goto out;
 494         }
 495
 496         ret = -EAGAIN;
 497         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 498                 goto err;
 499         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 500         ret = PTR_ERR(inode);
 501         if (IS_ERR(inode))
 502                 goto err;
 503         ret = -ENOMEM;
 504         state = nfs4_get_open_state(inode, data->owner);
 505         if (state == NULL)
 506                 goto err_put_inode;
 507         if (data->o_res.delegation_type != 0) {
 508                 int delegation_flags = 0;
 509
 510                 rcu_read_lock();
 511                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 512                 if (delegation)
 513                         delegation_flags = delegation->flags;
 514                 rcu_read_unlock();
 515                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 516                         nfs_inode_set_delegation(state->inode,
 517                                         data->owner->so_cred,
 518                                         &data->o_res);
 519                 else
 520                         nfs_inode_reclaim_delegation(state->inode,
 521                                         data->owner->so_cred,
 522                                         &data->o_res);
 523         }
 524         rcu_read_lock();
 525         delegation = rcu_dereference(NFS_I(inode)->delegation);
 526         if (delegation != NULL)
 527                 deleg_stateid = &delegation->stateid;
 528         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 529         rcu_read_unlock();
 530         iput(inode);
 531 out:
 532         return state;
 533 err_put_inode:
 534         iput(inode);
 535 err:
 536         return ERR_PTR(ret);
 537 }
 538
 539 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 540 {
 541         struct nfs_inode *nfsi = NFS_I(state->inode);
 542         struct nfs_open_context *ctx;
 543
 544         spin_lock(&state->inode->i_lock);
 545         list_for_each_entry(ctx, &nfsi->open_files, list) {
 546                 if (ctx->state != state)
 547                         continue;
 548                 get_nfs_open_context(ctx);
 549                 spin_unlock(&state->inode->i_lock);
 550                 return ctx;
 551         }
 552         spin_unlock(&state->inode->i_lock);
 553         return ERR_PTR(-ENOENT);
 554 }
 555
 556 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 557 {
 558         struct nfs4_opendata *opendata;
 559
 560         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 561         if (opendata == NULL)
 562                 return ERR_PTR(-ENOMEM);
 563         opendata->state = state;
 564         atomic_inc(&state->count);
 565         return opendata;
 566 }
 567
 568 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 569 {
 570         struct nfs4_state *newstate;
 571         int ret;
 572
 573         opendata->o_arg.open_flags = openflags;
 574         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 575         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 576         nfs4_init_opendata_res(opendata);
 577         ret = _nfs4_proc_open(opendata);
 578         if (ret != 0)
 579                 return ret;
 580         newstate = nfs4_opendata_to_nfs4_state(opendata);
 581         if (IS_ERR(newstate))
 582                 return PTR_ERR(newstate);
 583         nfs4_close_state(&opendata->path, newstate, openflags);
 584         *res = newstate;
 585         return 0;
 586 }
 587
 588 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 589 {
 590         struct nfs4_state *newstate;
 591         int ret;
 592
 593         /* memory barrier prior to reading state->n_* */
 594         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 595         smp_rmb();
 596         if (state->n_rdwr != 0) {
 597                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 598                 if (ret != 0)
 599                         return ret;
 600                 if (newstate != state)
 601                         return -ESTALE;
 602         }
 603         if (state->n_wronly != 0) {
 604                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 605                 if (ret != 0)
 606                         return ret;
 607                 if (newstate != state)
 608                         return -ESTALE;
 609         }
 610         if (state->n_rdonly != 0) {
 611                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 612                 if (ret != 0)
 613                         return ret;
 614                 if (newstate != state)
 615                         return -ESTALE;
 616         }
 617         /*
 618          * We may have performed cached opens for all three recoveries.
 619          * Check if we need to update the current stateid.
 620          */
 621         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 622             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 623                 write_seqlock(&state->seqlock);
 624                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 625                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 626                 write_sequnlock(&state->seqlock);
 627         }
 628         return 0;
 629 }
 630
 631 /*
 632  * OPEN_RECLAIM:
 633  *      reclaim state on the server after a reboot.
 634  */
 635 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 636 {
 637         struct nfs_delegation *delegation;
 638         struct nfs4_opendata *opendata;
 639         int delegation_type = 0;
 640         int status;
 641
 642         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 643         if (IS_ERR(opendata))
 644                 return PTR_ERR(opendata);
 645         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 646         opendata->o_arg.fh = NFS_FH(state->inode);
 647         rcu_read_lock();
 648         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 649         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 650                 delegation_type = delegation->type;
 651         rcu_read_unlock();
 652         opendata->o_arg.u.delegation_type = delegation_type;
 653         status = nfs4_open_recover(opendata, state);
 654         nfs4_opendata_put(opendata);
 655         return status;
 656 }
 657
 658 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 659 {
 660         struct nfs_server *server = NFS_SERVER(state->inode);
 661         struct nfs4_exception exception = { };
 662         int err;
 663         do {
 664                 err = _nfs4_do_open_reclaim(ctx, state);
 665                 if (err != -NFS4ERR_DELAY)
 666                         break;
 667                 nfs4_handle_exception(server, err, &exception);
 668         } while (exception.retry);
 669         return err;
 670 }
 671
 672 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 673 {
 674         struct nfs_open_context *ctx;
 675         int ret;
 676
 677         ctx = nfs4_state_find_open_context(state);
 678         if (IS_ERR(ctx))
 679                 return PTR_ERR(ctx);
 680         ret = nfs4_do_open_reclaim(ctx, state);
 681         put_nfs_open_context(ctx);
 682         return ret;
 683 }
 684
 685 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 686 {
 687         struct nfs4_opendata *opendata;
 688         int ret;
 689
 690         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 691         if (IS_ERR(opendata))
 692                 return PTR_ERR(opendata);
 693         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 694         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 695                         sizeof(opendata->o_arg.u.delegation.data));
 696         ret = nfs4_open_recover(opendata, state);
 697         nfs4_opendata_put(opendata);
 698         return ret;
 699 }
 700
 701 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 702 {
 703         struct nfs4_exception exception = { };
 704         struct nfs_server *server = NFS_SERVER(state->inode);
 705         int err;
 706         do {
 707                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 708                 switch (err) {
 709                         case 0:
 710                                 return err;
 711                         case -NFS4ERR_STALE_CLIENTID:
 712                         case -NFS4ERR_STALE_STATEID:
 713                         case -NFS4ERR_EXPIRED:
 714                                 /* Don't recall a delegation if it was lost */
 715                                 nfs4_schedule_state_recovery(server->nfs_client);
 716                                 return err;
 717                 }
 718                 err = nfs4_handle_exception(server, err, &exception);
 719         } while (exception.retry);
 720         return err;
 721 }
 722
 723 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 724 {
 725         struct nfs4_opendata *data = calldata;
 726         struct  rpc_message msg = {
 727                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 728                 .rpc_argp = &data->c_arg,
 729                 .rpc_resp = &data->c_res,
 730                 .rpc_cred = data->owner->so_cred,
 731         };
 732         data->timestamp = jiffies;
 733         rpc_call_setup(task, &msg, 0);
 734 }
 735
 736 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 737 {
 738         struct nfs4_opendata *data = calldata;
 739
 740         data->rpc_status = task->tk_status;
 741         if (RPC_ASSASSINATED(task))
 742                 return;
 743         if (data->rpc_status == 0) {
 744                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 745                                 sizeof(data->o_res.stateid.data));
 746                 renew_lease(data->o_res.server, data->timestamp);
 747                 data->rpc_done = 1;
 748         }
 749         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 750         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 751 }
 752
 753 static void nfs4_open_confirm_release(void *calldata)
 754 {
 755         struct nfs4_opendata *data = calldata;
 756         struct nfs4_state *state = NULL;
 757
 758         /* If this request hasn't been cancelled, do nothing */
 759         if (data->cancelled == 0)
 760                 goto out_free;
 761         /* In case of error, no cleanup! */
 762         if (!data->rpc_done)
 763                 goto out_free;
 764         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 765         state = nfs4_opendata_to_nfs4_state(data);
 766         if (!IS_ERR(state))
 767                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 768 out_free:
 769         nfs4_opendata_put(data);
 770 }
 771
 772 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 773         .rpc_call_prepare = nfs4_open_confirm_prepare,
 774         .rpc_call_done = nfs4_open_confirm_done,
 775         .rpc_release = nfs4_open_confirm_release,
 776 };
 777
 778 /*
 779  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 780  */
 781 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 782 {
 783         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 784         struct rpc_task *task;
 785         int status;
 786
 787         kref_get(&data->kref);
 788         data->rpc_done = 0;
 789         data->rpc_status = 0;
 790         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 791         if (IS_ERR(task))
 792                 return PTR_ERR(task);
 793         status = nfs4_wait_for_completion_rpc_task(task);
 794         if (status != 0) {
 795                 data->cancelled = 1;
 796                 smp_wmb();
 797         } else
 798                 status = data->rpc_status;
 799         rpc_put_task(task);
 800         return status;
 801 }
 802
 803 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 804 {
 805         struct nfs4_opendata *data = calldata;
 806         struct nfs4_state_owner *sp = data->owner;
 807         struct rpc_message msg = {
 808                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 809                 .rpc_argp = &data->o_arg,
 810                 .rpc_resp = &data->o_res,
 811                 .rpc_cred = sp->so_cred,
 812         };
 813
 814         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 815                 return;
 816         /*
 817          * Check if we still need to send an OPEN call, or if we can use
 818          * a delegation instead.
 819          */
 820         if (data->state != NULL) {
 821                 struct nfs_delegation *delegation;
 822
 823                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 824                         goto out_no_action;
 825                 rcu_read_lock();
 826                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 827                 if (delegation != NULL &&
 828                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 829                         rcu_read_unlock();
 830                         goto out_no_action;
 831                 }
 832                 rcu_read_unlock();
 833         }
 834         /* Update sequence id. */
 835         data->o_arg.id = sp->so_owner_id.id;
 836         data->o_arg.clientid = sp->so_client->cl_clientid;
 837         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 838                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 839                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 840         }
 841         data->timestamp = jiffies;
 842         rpc_call_setup(task, &msg, 0);
 843         return;
 844 out_no_action:
 845         task->tk_action = NULL;
 846
 847 }
 848
 849 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 850 {
 851         struct nfs4_opendata *data = calldata;
 852
 853         data->rpc_status = task->tk_status;
 854         if (RPC_ASSASSINATED(task))
 855                 return;
 856         if (task->tk_status == 0) {
 857                 switch (data->o_res.f_attr->mode & S_IFMT) {
 858                         case S_IFREG:
 859                                 break;
 860                         case S_IFLNK:
 861                                 data->rpc_status = -ELOOP;
 862                                 break;
 863                         case S_IFDIR:
 864                                 data->rpc_status = -EISDIR;
 865                                 break;
 866                         default:
 867                                 data->rpc_status = -ENOTDIR;
 868                 }
 869                 renew_lease(data->o_res.server, data->timestamp);
 870                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 871                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 872         }
 873         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 874         data->rpc_done = 1;
 875 }
 876
 877 static void nfs4_open_release(void *calldata)
 878 {
 879         struct nfs4_opendata *data = calldata;
 880         struct nfs4_state *state = NULL;
 881
 882         /* If this request hasn't been cancelled, do nothing */
 883         if (data->cancelled == 0)
 884                 goto out_free;
 885         /* In case of error, no cleanup! */
 886         if (data->rpc_status != 0 || !data->rpc_done)
 887                 goto out_free;
 888         /* In case we need an open_confirm, no cleanup! */
 889         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 890                 goto out_free;
 891         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 892         state = nfs4_opendata_to_nfs4_state(data);
 893         if (!IS_ERR(state))
 894                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 895 out_free:
 896         nfs4_opendata_put(data);
 897 }
 898
 899 static const struct rpc_call_ops nfs4_open_ops = {
 900         .rpc_call_prepare = nfs4_open_prepare,
 901         .rpc_call_done = nfs4_open_done,
 902         .rpc_release = nfs4_open_release,
 903 };
 904
 905 /*
 906  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 907  */
 908 static int _nfs4_proc_open(struct nfs4_opendata *data)
 909 {
 910         struct inode *dir = data->dir->d_inode;
 911         struct nfs_server *server = NFS_SERVER(dir);
 912         struct nfs_openargs *o_arg = &data->o_arg;
 913         struct nfs_openres *o_res = &data->o_res;
 914         struct rpc_task *task;
 915         int status;
 916
 917         kref_get(&data->kref);
 918         data->rpc_done = 0;
 919         data->rpc_status = 0;
 920         data->cancelled = 0;
 921         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 922         if (IS_ERR(task))
 923                 return PTR_ERR(task);
 924         status = nfs4_wait_for_completion_rpc_task(task);
 925         if (status != 0) {
 926                 data->cancelled = 1;
 927                 smp_wmb();
 928         } else
 929                 status = data->rpc_status;
 930         rpc_put_task(task);
 931         if (status != 0 || !data->rpc_done)
 932                 return status;
 933
 934         if (o_res->fh.size == 0)
 935                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 936
 937         if (o_arg->open_flags & O_CREAT) {
 938                 update_changeattr(dir, &o_res->cinfo);
 939                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 940         } else
 941                 nfs_refresh_inode(dir, o_res->dir_attr);
 942         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 943                 status = _nfs4_proc_open_confirm(data);
 944                 if (status != 0)
 945                         return status;
 946         }
 947         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 948                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 949         return 0;
 950 }
 951
 952 static int nfs4_recover_expired_lease(struct nfs_server *server)
 953 {
 954         struct nfs_client *clp = server->nfs_client;
 955         int ret;
 956
 957         for (;;) {
 958                 ret = nfs4_wait_clnt_recover(server->client, clp);
 959                 if (ret != 0)
 960                         return ret;
 961                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 962                         break;
 963                 nfs4_schedule_state_recovery(clp);
 964         }
 965         return 0;
 966 }
 967
 968 /*
 969  * OPEN_EXPIRED:
 970  *      reclaim state on the server after a network partition.
 971  *      Assumes caller holds the appropriate lock
 972  */
 973 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 974 {
 975         struct nfs4_opendata *opendata;
 976         int ret;
 977
 978         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 979         if (IS_ERR(opendata))
 980                 return PTR_ERR(opendata);
 981         ret = nfs4_open_recover(opendata, state);
 982         if (ret == -ESTALE) {
 983                 /* Invalidate the state owner so we don't ever use it again */
 984                 nfs4_drop_state_owner(state->owner);
 985                 d_drop(ctx->path.dentry);
 986         }
 987         nfs4_opendata_put(opendata);
 988         return ret;
 989 }
 990
 991 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 992 {
 993         struct nfs_server *server = NFS_SERVER(state->inode);
 994         struct nfs4_exception exception = { };
 995         int err;
 996
 997         do {
 998                 err = _nfs4_open_expired(ctx, state);
 999                 if (err == -NFS4ERR_DELAY)
1000                         nfs4_handle_exception(server, err, &exception);
1001         } while (exception.retry);
1002         return err;
1003 }
1004
1005 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1006 {
1007         struct nfs_open_context *ctx;
1008         int ret;
1009
1010         ctx = nfs4_state_find_open_context(state);
1011         if (IS_ERR(ctx))
1012                 return PTR_ERR(ctx);
1013         ret = nfs4_do_open_expired(ctx, state);
1014         put_nfs_open_context(ctx);
1015         return ret;
1016 }
1017
1018 /*
1019  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1020  * fields corresponding to attributes that were used to store the verifier.
1021  * Make sure we clobber those fields in the later setattr call
1022  */
1023 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1024 {
1025         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1026             !(sattr->ia_valid & ATTR_ATIME_SET))
1027                 sattr->ia_valid |= ATTR_ATIME;
1028
1029         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1030             !(sattr->ia_valid & ATTR_MTIME_SET))
1031                 sattr->ia_valid |= ATTR_MTIME;
1032 }
1033
1034 /*
1035  * Returns a referenced nfs4_state
1036  */
1037 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1038 {
1039         struct nfs4_state_owner  *sp;
1040         struct nfs4_state     *state = NULL;
1041         struct nfs_server       *server = NFS_SERVER(dir);
1042         struct nfs_client *clp = server->nfs_client;
1043         struct nfs4_opendata *opendata;
1044         int status;
1045
1046         /* Protect against reboot recovery conflicts */
1047         status = -ENOMEM;
1048         if (!(sp = nfs4_get_state_owner(server, cred))) {
1049                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1050                 goto out_err;
1051         }
1052         status = nfs4_recover_expired_lease(server);
1053         if (status != 0)
1054                 goto err_put_state_owner;
1055         if (path->dentry->d_inode != NULL)
1056                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1057         down_read(&clp->cl_sem);
1058         status = -ENOMEM;
1059         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1060         if (opendata == NULL)
1061                 goto err_release_rwsem;
1062
1063         if (path->dentry->d_inode != NULL)
1064                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1065
1066         status = _nfs4_proc_open(opendata);
1067         if (status != 0)
1068                 goto err_opendata_put;
1069
1070         if (opendata->o_arg.open_flags & O_EXCL)
1071                 nfs4_exclusive_attrset(opendata, sattr);
1072
1073         state = nfs4_opendata_to_nfs4_state(opendata);
1074         status = PTR_ERR(state);
1075         if (IS_ERR(state))
1076                 goto err_opendata_put;
1077         nfs4_opendata_put(opendata);
1078         nfs4_put_state_owner(sp);
1079         up_read(&clp->cl_sem);
1080         *res = state;
1081         return 0;
1082 err_opendata_put:
1083         nfs4_opendata_put(opendata);
1084 err_release_rwsem:
1085         up_read(&clp->cl_sem);
1086 err_put_state_owner:
1087         nfs4_put_state_owner(sp);
1088 out_err:
1089         *res = NULL;
1090         return status;
1091 }
1092
1093
1094 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1095 {
1096         struct nfs4_exception exception = { };
1097         struct nfs4_state *res;
1098         int status;
1099
1100         do {
1101                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1102                 if (status == 0)
1103                         break;
1104                 /* NOTE: BAD_SEQID means the server and client disagree about the
1105                  * book-keeping w.r.t. state-changing operations
1106                  * (OPEN/CLOSE/LOCK/LOCKU...)
1107                  * It is actually a sign of a bug on the client or on the server.
1108                  *
1109                  * If we receive a BAD_SEQID error in the particular case of
1110                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1111                  * have unhashed the old state_owner for us, and that we can
1112                  * therefore safely retry using a new one. We should still warn
1113                  * the user though...
1114                  */
1115                 if (status == -NFS4ERR_BAD_SEQID) {
1116                         printk(KERN_WARNING "NFS: v4 server %s "
1117                                         " returned a bad sequence-id error!\n",
1118                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1119                         exception.retry = 1;
1120                         continue;
1121                 }
1122                 /*
1123                  * BAD_STATEID on OPEN means that the server cancelled our
1124                  * state before it received the OPEN_CONFIRM.
1125                  * Recover by retrying the request as per the discussion
1126                  * on Page 181 of RFC3530.
1127                  */
1128                 if (status == -NFS4ERR_BAD_STATEID) {
1129                         exception.retry = 1;
1130                         continue;
1131                 }
1132                 if (status == -EAGAIN) {
1133                         /* We must have found a delegation */
1134                         exception.retry = 1;
1135                         continue;
1136                 }
1137                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1138                                         status, &exception));
1139         } while (exception.retry);
1140         return res;
1141 }
1142
1143 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1144                 struct iattr *sattr, struct nfs4_state *state)
1145 {
1146         struct nfs_server *server = NFS_SERVER(inode);
1147         struct nfs_setattrargs  arg = {
1148                 .fh             = NFS_FH(inode),
1149                 .iap            = sattr,
1150                 .server         = server,
1151                 .bitmask = server->attr_bitmask,
1152         };
1153         struct nfs_setattrres  res = {
1154                 .fattr          = fattr,
1155                 .server         = server,
1156         };
1157         struct rpc_message msg = {
1158                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1159                 .rpc_argp       = &arg,
1160                 .rpc_resp       = &res,
1161         };
1162         unsigned long timestamp = jiffies;
1163         int status;
1164
1165         nfs_fattr_init(fattr);
1166
1167         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1168                 /* Use that stateid */
1169         } else if (state != NULL) {
1170                 msg.rpc_cred = state->owner->so_cred;
1171                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1172         } else
1173                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1174
1175         status = rpc_call_sync(server->client, &msg, 0);
1176         if (status == 0 && state != NULL)
1177                 renew_lease(server, timestamp);
1178         return status;
1179 }
1180
1181 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1182                 struct iattr *sattr, struct nfs4_state *state)
1183 {
1184         struct nfs_server *server = NFS_SERVER(inode);
1185         struct nfs4_exception exception = { };
1186         int err;
1187         do {
1188                 err = nfs4_handle_exception(server,
1189                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1190                                 &exception);
1191         } while (exception.retry);
1192         return err;
1193 }
1194
1195 struct nfs4_closedata {
1196         struct path path;
1197         struct inode *inode;
1198         struct nfs4_state *state;
1199         struct nfs_closeargs arg;
1200         struct nfs_closeres res;
1201         struct nfs_fattr fattr;
1202         unsigned long timestamp;
1203 };
1204
1205 static void nfs4_free_closedata(void *data)
1206 {
1207         struct nfs4_closedata *calldata = data;
1208         struct nfs4_state_owner *sp = calldata->state->owner;
1209
1210         nfs4_put_open_state(calldata->state);
1211         nfs_free_seqid(calldata->arg.seqid);
1212         nfs4_put_state_owner(sp);
1213         dput(calldata->path.dentry);
1214         mntput(calldata->path.mnt);
1215         kfree(calldata);
1216 }
1217
1218 static void nfs4_close_done(struct rpc_task *task, void *data)
1219 {
1220         struct nfs4_closedata *calldata = data;
1221         struct nfs4_state *state = calldata->state;
1222         struct nfs_server *server = NFS_SERVER(calldata->inode);
1223
1224         if (RPC_ASSASSINATED(task))
1225                 return;
1226         /* hmm. we are done with the inode, and in the process of freeing
1227          * the state_owner. we keep this around to process errors
1228          */
1229         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1230         switch (task->tk_status) {
1231                 case 0:
1232                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1233                         renew_lease(server, calldata->timestamp);
1234                         break;
1235                 case -NFS4ERR_STALE_STATEID:
1236                 case -NFS4ERR_EXPIRED:
1237                         break;
1238                 default:
1239                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1240                                 rpc_restart_call(task);
1241                                 return;
1242                         }
1243         }
1244         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1245 }
1246
1247 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1248 {
1249         struct nfs4_closedata *calldata = data;
1250         struct nfs4_state *state = calldata->state;
1251         struct rpc_message msg = {
1252                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1253                 .rpc_argp = &calldata->arg,
1254                 .rpc_resp = &calldata->res,
1255                 .rpc_cred = state->owner->so_cred,
1256         };
1257         int clear_rd, clear_wr, clear_rdwr;
1258
1259         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1260                 return;
1261
1262         clear_rd = clear_wr = clear_rdwr = 0;
1263         spin_lock(&state->owner->so_lock);
1264         /* Calculate the change in open mode */
1265         if (state->n_rdwr == 0) {
1266                 if (state->n_rdonly == 0) {
1267                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1268                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1269                 }
1270                 if (state->n_wronly == 0) {
1271                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1272                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1273                 }
1274         }
1275         spin_unlock(&state->owner->so_lock);
1276         if (!clear_rd && !clear_wr && !clear_rdwr) {
1277                 /* Note: exit _without_ calling nfs4_close_done */
1278                 task->tk_action = NULL;
1279                 return;
1280         }
1281         nfs_fattr_init(calldata->res.fattr);
1282         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1283                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1284                 calldata->arg.open_flags = FMODE_READ;
1285         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1286                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1287                 calldata->arg.open_flags = FMODE_WRITE;
1288         }
1289         calldata->timestamp = jiffies;
1290         rpc_call_setup(task, &msg, 0);
1291 }
1292
1293 static const struct rpc_call_ops nfs4_close_ops = {
1294         .rpc_call_prepare = nfs4_close_prepare,
1295         .rpc_call_done = nfs4_close_done,
1296         .rpc_release = nfs4_free_closedata,
1297 };
1298
1299 /*
1300  * It is possible for data to be read/written from a mem-mapped file
1301  * after the sys_close call (which hits the vfs layer as a flush).
1302  * This means that we can't safely call nfsv4 close on a file until
1303  * the inode is cleared. This in turn means that we are not good
1304  * NFSv4 citizens - we do not indicate to the server to update the file's
1305  * share state even when we are done with one of the three share
1306  * stateid's in the inode.
1307  *
1308  * NOTE: Caller must be holding the sp->so_owner semaphore!
1309  */
1310 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1311 {
1312         struct nfs_server *server = NFS_SERVER(state->inode);
1313         struct nfs4_closedata *calldata;
1314         struct nfs4_state_owner *sp = state->owner;
1315         struct rpc_task *task;
1316         int status = -ENOMEM;
1317
1318         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1319         if (calldata == NULL)
1320                 goto out;
1321         calldata->inode = state->inode;
1322         calldata->state = state;
1323         calldata->arg.fh = NFS_FH(state->inode);
1324         calldata->arg.stateid = &state->open_stateid;
1325         /* Serialization for the sequence id */
1326         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1327         if (calldata->arg.seqid == NULL)
1328                 goto out_free_calldata;
1329         calldata->arg.bitmask = server->attr_bitmask;
1330         calldata->res.fattr = &calldata->fattr;
1331         calldata->res.server = server;
1332         calldata->path.mnt = mntget(path->mnt);
1333         calldata->path.dentry = dget(path->dentry);
1334
1335         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1336         if (IS_ERR(task))
1337                 return PTR_ERR(task);
1338         rpc_put_task(task);
1339         return 0;
1340 out_free_calldata:
1341         kfree(calldata);
1342 out:
1343         nfs4_put_open_state(state);
1344         nfs4_put_state_owner(sp);
1345         return status;
1346 }
1347
1348 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1349 {
1350         struct file *filp;
1351         int ret;
1352
1353         /* If the open_intent is for execute, we have an extra check to make */
1354         if (nd->intent.open.flags & FMODE_EXEC) {
1355                 ret = nfs_may_open(state->inode,
1356                                 state->owner->so_cred,
1357                                 nd->intent.open.flags);
1358                 if (ret < 0)
1359                         goto out_close;
1360         }
1361         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1362         if (!IS_ERR(filp)) {
1363                 struct nfs_open_context *ctx;
1364                 ctx = nfs_file_open_context(filp);
1365                 ctx->state = state;
1366                 return 0;
1367         }
1368         ret = PTR_ERR(filp);
1369 out_close:
1370         nfs4_close_state(path, state, nd->intent.open.flags);
1371         return ret;
1372 }
1373
1374 struct dentry *
1375 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1376 {
1377         struct path path = {
1378                 .mnt = nd->mnt,
1379                 .dentry = dentry,
1380         };
1381         struct iattr attr;
1382         struct rpc_cred *cred;
1383         struct nfs4_state *state;
1384         struct dentry *res;
1385
1386         if (nd->flags & LOOKUP_CREATE) {
1387                 attr.ia_mode = nd->intent.open.create_mode;
1388                 attr.ia_valid = ATTR_MODE;
1389                 if (!IS_POSIXACL(dir))
1390                         attr.ia_mode &= ~current->fs->umask;
1391         } else {
1392                 attr.ia_valid = 0;
1393                 BUG_ON(nd->intent.open.flags & O_CREAT);
1394         }
1395
1396         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1397         if (IS_ERR(cred))
1398                 return (struct dentry *)cred;
1399         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1400         put_rpccred(cred);
1401         if (IS_ERR(state)) {
1402                 if (PTR_ERR(state) == -ENOENT) {
1403                         d_add(dentry, NULL);
1404                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1405                 }
1406                 return (struct dentry *)state;
1407         }
1408         res = d_add_unique(dentry, igrab(state->inode));
1409         if (res != NULL)
1410                 path.dentry = res;
1411         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1412         nfs4_intent_set_file(nd, &path, state);
1413         return res;
1414 }
1415
1416 int
1417 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1418 {
1419         struct path path = {
1420                 .mnt = nd->mnt,
1421                 .dentry = dentry,
1422         };
1423         struct rpc_cred *cred;
1424         struct nfs4_state *state;
1425
1426         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1427         if (IS_ERR(cred))
1428                 return PTR_ERR(cred);
1429         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1430         put_rpccred(cred);
1431         if (IS_ERR(state)) {
1432                 switch (PTR_ERR(state)) {
1433                         case -EPERM:
1434                         case -EACCES:
1435                         case -EDQUOT:
1436                         case -ENOSPC:
1437                         case -EROFS:
1438                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1439                                 return 1;
1440                         default:
1441                                 goto out_drop;
1442                 }
1443         }
1444         if (state->inode == dentry->d_inode) {
1445                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1446                 nfs4_intent_set_file(nd, &path, state);
1447                 return 1;
1448         }
1449         nfs4_close_state(&path, state, openflags);
1450 out_drop:
1451         d_drop(dentry);
1452         return 0;
1453 }
1454
1455
1456 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1457 {
1458         struct nfs4_server_caps_res res = {};
1459         struct rpc_message msg = {
1460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1461                 .rpc_argp = fhandle,
1462                 .rpc_resp = &res,
1463         };
1464         int status;
1465
1466         status = rpc_call_sync(server->client, &msg, 0);
1467         if (status == 0) {
1468                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1469                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1470                         server->caps |= NFS_CAP_ACLS;
1471                 if (res.has_links != 0)
1472                         server->caps |= NFS_CAP_HARDLINKS;
1473                 if (res.has_symlinks != 0)
1474                         server->caps |= NFS_CAP_SYMLINKS;
1475                 server->acl_bitmask = res.acl_bitmask;
1476         }
1477         return status;
1478 }
1479
1480 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1481 {
1482         struct nfs4_exception exception = { };
1483         int err;
1484         do {
1485                 err = nfs4_handle_exception(server,
1486                                 _nfs4_server_capabilities(server, fhandle),
1487                                 &exception);
1488         } while (exception.retry);
1489         return err;
1490 }
1491
1492 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1493                 struct nfs_fsinfo *info)
1494 {
1495         struct nfs4_lookup_root_arg args = {
1496                 .bitmask = nfs4_fattr_bitmap,
1497         };
1498         struct nfs4_lookup_res res = {
1499                 .server = server,
1500                 .fattr = info->fattr,
1501                 .fh = fhandle,
1502         };
1503         struct rpc_message msg = {
1504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1505                 .rpc_argp = &args,
1506                 .rpc_resp = &res,
1507         };
1508         nfs_fattr_init(info->fattr);
1509         return rpc_call_sync(server->client, &msg, 0);
1510 }
1511
1512 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1513                 struct nfs_fsinfo *info)
1514 {
1515         struct nfs4_exception exception = { };
1516         int err;
1517         do {
1518                 err = nfs4_handle_exception(server,
1519                                 _nfs4_lookup_root(server, fhandle, info),
1520                                 &exception);
1521         } while (exception.retry);
1522         return err;
1523 }
1524
1525 /*
1526  * get the file handle for the "/" directory on the server
1527  */
1528 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1529                               struct nfs_fsinfo *info)
1530 {
1531         int status;
1532
1533         status = nfs4_lookup_root(server, fhandle, info);
1534         if (status == 0)
1535                 status = nfs4_server_capabilities(server, fhandle);
1536         if (status == 0)
1537                 status = nfs4_do_fsinfo(server, fhandle, info);
1538         return nfs4_map_errors(status);
1539 }
1540
1541 /*
1542  * Get locations and (maybe) other attributes of a referral.
1543  * Note that we'll actually follow the referral later when
1544  * we detect fsid mismatch in inode revalidation
1545  */
1546 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1547 {
1548         int status = -ENOMEM;
1549         struct page *page = NULL;
1550         struct nfs4_fs_locations *locations = NULL;
1551
1552         page = alloc_page(GFP_KERNEL);
1553         if (page == NULL)
1554                 goto out;
1555         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1556         if (locations == NULL)
1557                 goto out;
1558
1559         status = nfs4_proc_fs_locations(dir, name, locations, page);
1560         if (status != 0)
1561                 goto out;
1562         /* Make sure server returned a different fsid for the referral */
1563         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1564                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1565                 status = -EIO;
1566                 goto out;
1567         }
1568
1569         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1570         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1571         if (!fattr->mode)
1572                 fattr->mode = S_IFDIR;
1573         memset(fhandle, 0, sizeof(struct nfs_fh));
1574 out:
1575         if (page)
1576                 __free_page(page);
1577         if (locations)
1578                 kfree(locations);
1579         return status;
1580 }
1581
1582 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1583 {
1584         struct nfs4_getattr_arg args = {
1585                 .fh = fhandle,
1586                 .bitmask = server->attr_bitmask,
1587         };
1588         struct nfs4_getattr_res res = {
1589                 .fattr = fattr,
1590                 .server = server,
1591         };
1592         struct rpc_message msg = {
1593                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1594                 .rpc_argp = &args,
1595                 .rpc_resp = &res,
1596         };
1597
1598         nfs_fattr_init(fattr);
1599         return rpc_call_sync(server->client, &msg, 0);
1600 }
1601
1602 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1603 {
1604         struct nfs4_exception exception = { };
1605         int err;
1606         do {
1607                 err = nfs4_handle_exception(server,
1608                                 _nfs4_proc_getattr(server, fhandle, fattr),
1609                                 &exception);
1610         } while (exception.retry);
1611         return err;
1612 }
1613
1614 /*
1615  * The file is not closed if it is opened due to the a request to change
1616  * the size of the file. The open call will not be needed once the
1617  * VFS layer lookup-intents are implemented.
1618  *
1619  * Close is called when the inode is destroyed.
1620  * If we haven't opened the file for O_WRONLY, we
1621  * need to in the size_change case to obtain a stateid.
1622  *
1623  * Got race?
1624  * Because OPEN is always done by name in nfsv4, it is
1625  * possible that we opened a different file by the same
1626  * name.  We can recognize this race condition, but we
1627  * can't do anything about it besides returning an error.
1628  *
1629  * This will be fixed with VFS changes (lookup-intent).
1630  */
1631 static int
1632 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1633                   struct iattr *sattr)
1634 {
1635         struct rpc_cred *cred;
1636         struct inode *inode = dentry->d_inode;
1637         struct nfs_open_context *ctx;
1638         struct nfs4_state *state = NULL;
1639         int status;
1640
1641         nfs_fattr_init(fattr);
1642
1643         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1644         if (IS_ERR(cred))
1645                 return PTR_ERR(cred);
1646
1647         /* Search for an existing open(O_WRITE) file */
1648         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1649         if (ctx != NULL)
1650                 state = ctx->state;
1651
1652         status = nfs4_do_setattr(inode, fattr, sattr, state);
1653         if (status == 0)
1654                 nfs_setattr_update_inode(inode, sattr);
1655         if (ctx != NULL)
1656                 put_nfs_open_context(ctx);
1657         put_rpccred(cred);
1658         return status;
1659 }
1660
1661 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1662                 const struct qstr *name, struct nfs_fh *fhandle,
1663                 struct nfs_fattr *fattr)
1664 {
1665         int                    status;
1666         struct nfs4_lookup_arg args = {
1667                 .bitmask = server->attr_bitmask,
1668                 .dir_fh = dirfh,
1669                 .name = name,
1670         };
1671         struct nfs4_lookup_res res = {
1672                 .server = server,
1673                 .fattr = fattr,
1674                 .fh = fhandle,
1675         };
1676         struct rpc_message msg = {
1677                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1678                 .rpc_argp = &args,
1679                 .rpc_resp = &res,
1680         };
1681
1682         nfs_fattr_init(fattr);
1683
1684         dprintk("NFS call  lookupfh %s\n", name->name);
1685         status = rpc_call_sync(server->client, &msg, 0);
1686         dprintk("NFS reply lookupfh: %d\n", status);
1687         return status;
1688 }
1689
1690 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1691                               struct qstr *name, struct nfs_fh *fhandle,
1692                               struct nfs_fattr *fattr)
1693 {
1694         struct nfs4_exception exception = { };
1695         int err;
1696         do {
1697                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1698                 /* FIXME: !!!! */
1699                 if (err == -NFS4ERR_MOVED) {
1700                         err = -EREMOTE;
1701                         break;
1702                 }
1703                 err = nfs4_handle_exception(server, err, &exception);
1704         } while (exception.retry);
1705         return err;
1706 }
1707
1708 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1709                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1710 {
1711         int status;
1712
1713         dprintk("NFS call  lookup %s\n", name->name);
1714         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1715         if (status == -NFS4ERR_MOVED)
1716                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1717         dprintk("NFS reply lookup: %d\n", status);
1718         return status;
1719 }
1720
1721 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1722 {
1723         struct nfs4_exception exception = { };
1724         int err;
1725         do {
1726                 err = nfs4_handle_exception(NFS_SERVER(dir),
1727                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1728                                 &exception);
1729         } while (exception.retry);
1730         return err;
1731 }
1732
1733 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1734 {
1735         struct nfs_server *server = NFS_SERVER(inode);
1736         struct nfs_fattr fattr;
1737         struct nfs4_accessargs args = {
1738                 .fh = NFS_FH(inode),
1739                 .bitmask = server->attr_bitmask,
1740         };
1741         struct nfs4_accessres res = {
1742                 .server = server,
1743                 .fattr = &fattr,
1744         };
1745         struct rpc_message msg = {
1746                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1747                 .rpc_argp = &args,
1748                 .rpc_resp = &res,
1749                 .rpc_cred = entry->cred,
1750         };
1751         int mode = entry->mask;
1752         int status;
1753
1754         /*
1755          * Determine which access bits we want to ask for...
1756          */
1757         if (mode & MAY_READ)
1758                 args.access |= NFS4_ACCESS_READ;
1759         if (S_ISDIR(inode->i_mode)) {
1760                 if (mode & MAY_WRITE)
1761                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1762                 if (mode & MAY_EXEC)
1763                         args.access |= NFS4_ACCESS_LOOKUP;
1764         } else {
1765                 if (mode & MAY_WRITE)
1766                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1767                 if (mode & MAY_EXEC)
1768                         args.access |= NFS4_ACCESS_EXECUTE;
1769         }
1770         nfs_fattr_init(&fattr);
1771         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1772         if (!status) {
1773                 entry->mask = 0;
1774                 if (res.access & NFS4_ACCESS_READ)
1775                         entry->mask |= MAY_READ;
1776                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1777                         entry->mask |= MAY_WRITE;
1778                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1779                         entry->mask |= MAY_EXEC;
1780                 nfs_refresh_inode(inode, &fattr);
1781         }
1782         return status;
1783 }
1784
1785 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1786 {
1787         struct nfs4_exception exception = { };
1788         int err;
1789         do {
1790                 err = nfs4_handle_exception(NFS_SERVER(inode),
1791                                 _nfs4_proc_access(inode, entry),
1792                                 &exception);
1793         } while (exception.retry);
1794         return err;
1795 }
1796
1797 /*
1798  * TODO: For the time being, we don't try to get any attributes
1799  * along with any of the zero-copy operations READ, READDIR,
1800  * READLINK, WRITE.
1801  *
1802  * In the case of the first three, we want to put the GETATTR
1803  * after the read-type operation -- this is because it is hard
1804  * to predict the length of a GETATTR response in v4, and thus
1805  * align the READ data correctly.  This means that the GETATTR
1806  * may end up partially falling into the page cache, and we should
1807  * shift it into the 'tail' of the xdr_buf before processing.
1808  * To do this efficiently, we need to know the total length
1809  * of data received, which doesn't seem to be available outside
1810  * of the RPC layer.
1811  *
1812  * In the case of WRITE, we also want to put the GETATTR after
1813  * the operation -- in this case because we want to make sure
1814  * we get the post-operation mtime and size.  This means that
1815  * we can't use xdr_encode_pages() as written: we need a variant
1816  * of it which would leave room in the 'tail' iovec.
1817  *
1818  * Both of these changes to the XDR layer would in fact be quite
1819  * minor, but I decided to leave them for a subsequent patch.
1820  */
1821 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1822                 unsigned int pgbase, unsigned int pglen)
1823 {
1824         struct nfs4_readlink args = {
1825                 .fh       = NFS_FH(inode),
1826                 .pgbase   = pgbase,
1827                 .pglen    = pglen,
1828                 .pages    = &page,
1829         };
1830         struct rpc_message msg = {
1831                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1832                 .rpc_argp = &args,
1833                 .rpc_resp = NULL,
1834         };
1835
1836         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1837 }
1838
1839 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1840                 unsigned int pgbase, unsigned int pglen)
1841 {
1842         struct nfs4_exception exception = { };
1843         int err;
1844         do {
1845                 err = nfs4_handle_exception(NFS_SERVER(inode),
1846                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1847                                 &exception);
1848         } while (exception.retry);
1849         return err;
1850 }
1851
1852 /*
1853  * Got race?
1854  * We will need to arrange for the VFS layer to provide an atomic open.
1855  * Until then, this create/open method is prone to inefficiency and race
1856  * conditions due to the lookup, create, and open VFS calls from sys_open()
1857  * placed on the wire.
1858  *
1859  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1860  * The file will be opened again in the subsequent VFS open call
1861  * (nfs4_proc_file_open).
1862  *
1863  * The open for read will just hang around to be used by any process that
1864  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1865  */
1866
1867 static int
1868 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1869                  int flags, struct nameidata *nd)
1870 {
1871         struct path path = {
1872                 .mnt = nd->mnt,
1873                 .dentry = dentry,
1874         };
1875         struct nfs4_state *state;
1876         struct rpc_cred *cred;
1877         int status = 0;
1878
1879         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1880         if (IS_ERR(cred)) {
1881                 status = PTR_ERR(cred);
1882                 goto out;
1883         }
1884         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1885         put_rpccred(cred);
1886         d_drop(dentry);
1887         if (IS_ERR(state)) {
1888                 status = PTR_ERR(state);
1889                 goto out;
1890         }
1891         d_add(dentry, igrab(state->inode));
1892         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1893         if (flags & O_EXCL) {
1894                 struct nfs_fattr fattr;
1895                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1896                 if (status == 0)
1897                         nfs_setattr_update_inode(state->inode, sattr);
1898                 nfs_post_op_update_inode(state->inode, &fattr);
1899         }
1900         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1901                 status = nfs4_intent_set_file(nd, &path, state);
1902         else
1903                 nfs4_close_state(&path, state, flags);
1904 out:
1905         return status;
1906 }
1907
1908 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1909 {
1910         struct nfs_server *server = NFS_SERVER(dir);
1911         struct nfs_removeargs args = {
1912                 .fh = NFS_FH(dir),
1913                 .name.len = name->len,
1914                 .name.name = name->name,
1915                 .bitmask = server->attr_bitmask,
1916         };
1917         struct nfs_removeres res = {
1918                 .server = server,
1919         };
1920         struct rpc_message msg = {
1921                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1922                 .rpc_argp = &args,
1923                 .rpc_resp = &res,
1924         };
1925         int                     status;
1926
1927         nfs_fattr_init(&res.dir_attr);
1928         status = rpc_call_sync(server->client, &msg, 0);
1929         if (status == 0) {
1930                 update_changeattr(dir, &res.cinfo);
1931                 nfs_post_op_update_inode(dir, &res.dir_attr);
1932         }
1933         return status;
1934 }
1935
1936 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1937 {
1938         struct nfs4_exception exception = { };
1939         int err;
1940         do {
1941                 err = nfs4_handle_exception(NFS_SERVER(dir),
1942                                 _nfs4_proc_remove(dir, name),
1943                                 &exception);
1944         } while (exception.retry);
1945         return err;
1946 }
1947
1948 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1949 {
1950         struct nfs_server *server = NFS_SERVER(dir);
1951         struct nfs_removeargs *args = msg->rpc_argp;
1952         struct nfs_removeres *res = msg->rpc_resp;
1953
1954         args->bitmask = server->attr_bitmask;
1955         res->server = server;
1956         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1957 }
1958
1959 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1960 {
1961         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1962
1963         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1964                 return 0;
1965         update_changeattr(dir, &res->cinfo);
1966         nfs_post_op_update_inode(dir, &res->dir_attr);
1967         return 1;
1968 }
1969
1970 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1971                 struct inode *new_dir, struct qstr *new_name)
1972 {
1973         struct nfs_server *server = NFS_SERVER(old_dir);
1974         struct nfs4_rename_arg arg = {
1975                 .old_dir = NFS_FH(old_dir),
1976                 .new_dir = NFS_FH(new_dir),
1977                 .old_name = old_name,
1978                 .new_name = new_name,
1979                 .bitmask = server->attr_bitmask,
1980         };
1981         struct nfs_fattr old_fattr, new_fattr;
1982         struct nfs4_rename_res res = {
1983                 .server = server,
1984                 .old_fattr = &old_fattr,
1985                 .new_fattr = &new_fattr,
1986         };
1987         struct rpc_message msg = {
1988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1989                 .rpc_argp = &arg,
1990                 .rpc_resp = &res,
1991         };
1992         int                     status;
1993
1994         nfs_fattr_init(res.old_fattr);
1995         nfs_fattr_init(res.new_fattr);
1996         status = rpc_call_sync(server->client, &msg, 0);
1997
1998         if (!status) {
1999                 update_changeattr(old_dir, &res.old_cinfo);
2000                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2001                 update_changeattr(new_dir, &res.new_cinfo);
2002                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2003         }
2004         return status;
2005 }
2006
2007 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2008                 struct inode *new_dir, struct qstr *new_name)
2009 {
2010         struct nfs4_exception exception = { };
2011         int err;
2012         do {
2013                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2014                                 _nfs4_proc_rename(old_dir, old_name,
2015                                         new_dir, new_name),
2016                                 &exception);
2017         } while (exception.retry);
2018         return err;
2019 }
2020
2021 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2022 {
2023         struct nfs_server *server = NFS_SERVER(inode);
2024         struct nfs4_link_arg arg = {
2025                 .fh     = NFS_FH(inode),
2026                 .dir_fh = NFS_FH(dir),
2027                 .name   = name,
2028                 .bitmask = server->attr_bitmask,
2029         };
2030         struct nfs_fattr fattr, dir_attr;
2031         struct nfs4_link_res res = {
2032                 .server = server,
2033                 .fattr = &fattr,
2034                 .dir_attr = &dir_attr,
2035         };
2036         struct rpc_message msg = {
2037                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2038                 .rpc_argp = &arg,
2039                 .rpc_resp = &res,
2040         };
2041         int                     status;
2042
2043         nfs_fattr_init(res.fattr);
2044         nfs_fattr_init(res.dir_attr);
2045         status = rpc_call_sync(server->client, &msg, 0);
2046         if (!status) {
2047                 update_changeattr(dir, &res.cinfo);
2048                 nfs_post_op_update_inode(dir, res.dir_attr);
2049                 nfs_post_op_update_inode(inode, res.fattr);
2050         }
2051
2052         return status;
2053 }
2054
2055 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2056 {
2057         struct nfs4_exception exception = { };
2058         int err;
2059         do {
2060                 err = nfs4_handle_exception(NFS_SERVER(inode),
2061                                 _nfs4_proc_link(inode, dir, name),
2062                                 &exception);
2063         } while (exception.retry);
2064         return err;
2065 }
2066
2067 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2068                 struct page *page, unsigned int len, struct iattr *sattr)
2069 {
2070         struct nfs_server *server = NFS_SERVER(dir);
2071         struct nfs_fh fhandle;
2072         struct nfs_fattr fattr, dir_fattr;
2073         struct nfs4_create_arg arg = {
2074                 .dir_fh = NFS_FH(dir),
2075                 .server = server,
2076                 .name = &dentry->d_name,
2077                 .attrs = sattr,
2078                 .ftype = NF4LNK,
2079                 .bitmask = server->attr_bitmask,
2080         };
2081         struct nfs4_create_res res = {
2082                 .server = server,
2083                 .fh = &fhandle,
2084                 .fattr = &fattr,
2085                 .dir_fattr = &dir_fattr,
2086         };
2087         struct rpc_message msg = {
2088                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2089                 .rpc_argp = &arg,
2090                 .rpc_resp = &res,
2091         };
2092         int                     status;
2093
2094         if (len > NFS4_MAXPATHLEN)
2095                 return -ENAMETOOLONG;
2096
2097         arg.u.symlink.pages = &page;
2098         arg.u.symlink.len = len;
2099         nfs_fattr_init(&fattr);
2100         nfs_fattr_init(&dir_fattr);
2101
2102         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2103         if (!status) {
2104                 update_changeattr(dir, &res.dir_cinfo);
2105                 nfs_post_op_update_inode(dir, res.dir_fattr);
2106                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2107         }
2108         return status;
2109 }
2110
2111 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2112                 struct page *page, unsigned int len, struct iattr *sattr)
2113 {
2114         struct nfs4_exception exception = { };
2115         int err;
2116         do {
2117                 err = nfs4_handle_exception(NFS_SERVER(dir),
2118                                 _nfs4_proc_symlink(dir, dentry, page,
2119                                                         len, sattr),
2120                                 &exception);
2121         } while (exception.retry);
2122         return err;
2123 }
2124
2125 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2126                 struct iattr *sattr)
2127 {
2128         struct nfs_server *server = NFS_SERVER(dir);
2129         struct nfs_fh fhandle;
2130         struct nfs_fattr fattr, dir_fattr;
2131         struct nfs4_create_arg arg = {
2132                 .dir_fh = NFS_FH(dir),
2133                 .server = server,
2134                 .name = &dentry->d_name,
2135                 .attrs = sattr,
2136                 .ftype = NF4DIR,
2137                 .bitmask = server->attr_bitmask,
2138         };
2139         struct nfs4_create_res res = {
2140                 .server = server,
2141                 .fh = &fhandle,
2142                 .fattr = &fattr,
2143                 .dir_fattr = &dir_fattr,
2144         };
2145         struct rpc_message msg = {
2146                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2147                 .rpc_argp = &arg,
2148                 .rpc_resp = &res,
2149         };
2150         int                     status;
2151
2152         nfs_fattr_init(&fattr);
2153         nfs_fattr_init(&dir_fattr);
2154
2155         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2156         if (!status) {
2157                 update_changeattr(dir, &res.dir_cinfo);
2158                 nfs_post_op_update_inode(dir, res.dir_fattr);
2159                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2160         }
2161         return status;
2162 }
2163
2164 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2165                 struct iattr *sattr)
2166 {
2167         struct nfs4_exception exception = { };
2168         int err;
2169         do {
2170                 err = nfs4_handle_exception(NFS_SERVER(dir),
2171                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2172                                 &exception);
2173         } while (exception.retry);
2174         return err;
2175 }
2176
2177 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2178                   u64 cookie, struct page *page, unsigned int count, int plus)
2179 {
2180         struct inode            *dir = dentry->d_inode;
2181         struct nfs4_readdir_arg args = {
2182                 .fh = NFS_FH(dir),
2183                 .pages = &page,
2184                 .pgbase = 0,
2185                 .count = count,
2186                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2187         };
2188         struct nfs4_readdir_res res;
2189         struct rpc_message msg = {
2190                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2191                 .rpc_argp = &args,
2192                 .rpc_resp = &res,
2193                 .rpc_cred = cred,
2194         };
2195         int                     status;
2196
2197         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2198                         dentry->d_parent->d_name.name,
2199                         dentry->d_name.name,
2200                         (unsigned long long)cookie);
2201         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2202         res.pgbase = args.pgbase;
2203         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2204         if (status == 0)
2205                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2206
2207         nfs_invalidate_atime(dir);
2208
2209         dprintk("%s: returns %d\n", __FUNCTION__, status);
2210         return status;
2211 }
2212
2213 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2214                   u64 cookie, struct page *page, unsigned int count, int plus)
2215 {
2216         struct nfs4_exception exception = { };
2217         int err;
2218         do {
2219                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2220                                 _nfs4_proc_readdir(dentry, cred, cookie,
2221                                         page, count, plus),
2222                                 &exception);
2223         } while (exception.retry);
2224         return err;
2225 }
2226
2227 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2228                 struct iattr *sattr, dev_t rdev)
2229 {
2230         struct nfs_server *server = NFS_SERVER(dir);
2231         struct nfs_fh fh;
2232         struct nfs_fattr fattr, dir_fattr;
2233         struct nfs4_create_arg arg = {
2234                 .dir_fh = NFS_FH(dir),
2235                 .server = server,
2236                 .name = &dentry->d_name,
2237                 .attrs = sattr,
2238                 .bitmask = server->attr_bitmask,
2239         };
2240         struct nfs4_create_res res = {
2241                 .server = server,
2242                 .fh = &fh,
2243                 .fattr = &fattr,
2244                 .dir_fattr = &dir_fattr,
2245         };
2246         struct rpc_message msg = {
2247                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2248                 .rpc_argp = &arg,
2249                 .rpc_resp = &res,
2250         };
2251         int                     status;
2252         int                     mode = sattr->ia_mode;
2253
2254         nfs_fattr_init(&fattr);
2255         nfs_fattr_init(&dir_fattr);
2256
2257         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2258         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2259         if (S_ISFIFO(mode))
2260                 arg.ftype = NF4FIFO;
2261         else if (S_ISBLK(mode)) {
2262                 arg.ftype = NF4BLK;
2263                 arg.u.device.specdata1 = MAJOR(rdev);
2264                 arg.u.device.specdata2 = MINOR(rdev);
2265         }
2266         else if (S_ISCHR(mode)) {
2267                 arg.ftype = NF4CHR;
2268                 arg.u.device.specdata1 = MAJOR(rdev);
2269                 arg.u.device.specdata2 = MINOR(rdev);
2270         }
2271         else
2272                 arg.ftype = NF4SOCK;
2273
2274         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2275         if (status == 0) {
2276                 update_changeattr(dir, &res.dir_cinfo);
2277                 nfs_post_op_update_inode(dir, res.dir_fattr);
2278                 status = nfs_instantiate(dentry, &fh, &fattr);
2279         }
2280         return status;
2281 }
2282
2283 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2284                 struct iattr *sattr, dev_t rdev)
2285 {
2286         struct nfs4_exception exception = { };
2287         int err;
2288         do {
2289                 err = nfs4_handle_exception(NFS_SERVER(dir),
2290                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2291                                 &exception);
2292         } while (exception.retry);
2293         return err;
2294 }
2295
2296 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2297                  struct nfs_fsstat *fsstat)
2298 {
2299         struct nfs4_statfs_arg args = {
2300                 .fh = fhandle,
2301                 .bitmask = server->attr_bitmask,
2302         };
2303         struct rpc_message msg = {
2304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2305                 .rpc_argp = &args,
2306                 .rpc_resp = fsstat,
2307         };
2308
2309         nfs_fattr_init(fsstat->fattr);
2310         return rpc_call_sync(server->client, &msg, 0);
2311 }
2312
2313 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2314 {
2315         struct nfs4_exception exception = { };
2316         int err;
2317         do {
2318                 err = nfs4_handle_exception(server,
2319                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2320                                 &exception);
2321         } while (exception.retry);
2322         return err;
2323 }
2324
2325 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2326                 struct nfs_fsinfo *fsinfo)
2327 {
2328         struct nfs4_fsinfo_arg args = {
2329                 .fh = fhandle,
2330                 .bitmask = server->attr_bitmask,
2331         };
2332         struct rpc_message msg = {
2333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2334                 .rpc_argp = &args,
2335                 .rpc_resp = fsinfo,
2336         };
2337
2338         return rpc_call_sync(server->client, &msg, 0);
2339 }
2340
2341 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2342 {
2343         struct nfs4_exception exception = { };
2344         int err;
2345
2346         do {
2347                 err = nfs4_handle_exception(server,
2348                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2349                                 &exception);
2350         } while (exception.retry);
2351         return err;
2352 }
2353
2354 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2355 {
2356         nfs_fattr_init(fsinfo->fattr);
2357         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2358 }
2359
2360 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2361                 struct nfs_pathconf *pathconf)
2362 {
2363         struct nfs4_pathconf_arg args = {
2364                 .fh = fhandle,
2365                 .bitmask = server->attr_bitmask,
2366         };
2367         struct rpc_message msg = {
2368                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2369                 .rpc_argp = &args,
2370                 .rpc_resp = pathconf,
2371         };
2372
2373         /* None of the pathconf attributes are mandatory to implement */
2374         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2375                 memset(pathconf, 0, sizeof(*pathconf));
2376                 return 0;
2377         }
2378
2379         nfs_fattr_init(pathconf->fattr);
2380         return rpc_call_sync(server->client, &msg, 0);
2381 }
2382
2383 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2384                 struct nfs_pathconf *pathconf)
2385 {
2386         struct nfs4_exception exception = { };
2387         int err;
2388
2389         do {
2390                 err = nfs4_handle_exception(server,
2391                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2392                                 &exception);
2393         } while (exception.retry);
2394         return err;
2395 }
2396
2397 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2398 {
2399         struct nfs_server *server = NFS_SERVER(data->inode);
2400
2401         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2402                 rpc_restart_call(task);
2403                 return -EAGAIN;
2404         }
2405
2406         nfs_invalidate_atime(data->inode);
2407         if (task->tk_status > 0)
2408                 renew_lease(server, data->timestamp);
2409         return 0;
2410 }
2411
2412 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2413 {
2414         struct rpc_message msg = {
2415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2416                 .rpc_argp = &data->args,
2417                 .rpc_resp = &data->res,
2418                 .rpc_cred = data->cred,
2419         };
2420
2421         data->timestamp   = jiffies;
2422
2423         rpc_call_setup(&data->task, &msg, 0);
2424 }
2425
2426 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2427 {
2428         struct inode *inode = data->inode;
2429
2430         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2431                 rpc_restart_call(task);
2432                 return -EAGAIN;
2433         }
2434         if (task->tk_status >= 0) {
2435                 renew_lease(NFS_SERVER(inode), data->timestamp);
2436                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2437         }
2438         return 0;
2439 }
2440
2441 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2442 {
2443         struct rpc_message msg = {
2444                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2445                 .rpc_argp = &data->args,
2446                 .rpc_resp = &data->res,
2447                 .rpc_cred = data->cred,
2448         };
2449         struct inode *inode = data->inode;
2450         struct nfs_server *server = NFS_SERVER(inode);
2451         int stable;
2452
2453         if (how & FLUSH_STABLE) {
2454                 if (!NFS_I(inode)->ncommit)
2455                         stable = NFS_FILE_SYNC;
2456                 else
2457                         stable = NFS_DATA_SYNC;
2458         } else
2459                 stable = NFS_UNSTABLE;
2460         data->args.stable = stable;
2461         data->args.bitmask = server->attr_bitmask;
2462         data->res.server = server;
2463
2464         data->timestamp   = jiffies;
2465
2466         /* Finalize the task. */
2467         rpc_call_setup(&data->task, &msg, 0);
2468 }
2469
2470 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2471 {
2472         struct inode *inode = data->inode;
2473
2474         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2475                 rpc_restart_call(task);
2476                 return -EAGAIN;
2477         }
2478         if (task->tk_status >= 0)
2479                 nfs_post_op_update_inode(inode, data->res.fattr);
2480         return 0;
2481 }
2482
2483 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2484 {
2485         struct rpc_message msg = {
2486                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2487                 .rpc_argp = &data->args,
2488                 .rpc_resp = &data->res,
2489                 .rpc_cred = data->cred,
2490         };
2491         struct nfs_server *server = NFS_SERVER(data->inode);
2492
2493         data->args.bitmask = server->attr_bitmask;
2494         data->res.server = server;
2495
2496         rpc_call_setup(&data->task, &msg, 0);
2497 }
2498
2499 /*
2500  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2501  * standalone procedure for queueing an asynchronous RENEW.
2502  */
2503 static void nfs4_renew_done(struct rpc_task *task, void *data)
2504 {
2505         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2506         unsigned long timestamp = (unsigned long)data;
2507
2508         if (task->tk_status < 0) {
2509                 switch (task->tk_status) {
2510                         case -NFS4ERR_STALE_CLIENTID:
2511                         case -NFS4ERR_EXPIRED:
2512                         case -NFS4ERR_CB_PATH_DOWN:
2513                                 nfs4_schedule_state_recovery(clp);
2514                 }
2515                 return;
2516         }
2517         spin_lock(&clp->cl_lock);
2518         if (time_before(clp->cl_last_renewal,timestamp))
2519                 clp->cl_last_renewal = timestamp;
2520         spin_unlock(&clp->cl_lock);
2521 }
2522
2523 static const struct rpc_call_ops nfs4_renew_ops = {
2524         .rpc_call_done = nfs4_renew_done,
2525 };
2526
2527 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2528 {
2529         struct rpc_message msg = {
2530                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2531                 .rpc_argp       = clp,
2532                 .rpc_cred       = cred,
2533         };
2534
2535         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2536                         &nfs4_renew_ops, (void *)jiffies);
2537 }
2538
2539 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2540 {
2541         struct rpc_message msg = {
2542                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2543                 .rpc_argp       = clp,
2544                 .rpc_cred       = cred,
2545         };
2546         unsigned long now = jiffies;
2547         int status;
2548
2549         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2550         if (status < 0)
2551                 return status;
2552         spin_lock(&clp->cl_lock);
2553         if (time_before(clp->cl_last_renewal,now))
2554                 clp->cl_last_renewal = now;
2555         spin_unlock(&clp->cl_lock);
2556         return 0;
2557 }
2558
2559 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2560 {
2561         return (server->caps & NFS_CAP_ACLS)
2562                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2563                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2564 }
2565
2566 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2567  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2568  * the stack.
2569  */
2570 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2571
2572 static void buf_to_pages(const void *buf, size_t buflen,
2573                 struct page **pages, unsigned int *pgbase)
2574 {
2575         const void *p = buf;
2576
2577         *pgbase = offset_in_page(buf);
2578         p -= *pgbase;
2579         while (p < buf + buflen) {
2580                 *(pages++) = virt_to_page(p);
2581                 p += PAGE_CACHE_SIZE;
2582         }
2583 }
2584
2585 struct nfs4_cached_acl {
2586         int cached;
2587         size_t len;
2588         char data[0];
2589 };
2590
2591 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2592 {
2593         struct nfs_inode *nfsi = NFS_I(inode);
2594
2595         spin_lock(&inode->i_lock);
2596         kfree(nfsi->nfs4_acl);
2597         nfsi->nfs4_acl = acl;
2598         spin_unlock(&inode->i_lock);
2599 }
2600
2601 static void nfs4_zap_acl_attr(struct inode *inode)
2602 {
2603         nfs4_set_cached_acl(inode, NULL);
2604 }
2605
2606 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2607 {
2608         struct nfs_inode *nfsi = NFS_I(inode);
2609         struct nfs4_cached_acl *acl;
2610         int ret = -ENOENT;
2611
2612         spin_lock(&inode->i_lock);
2613         acl = nfsi->nfs4_acl;
2614         if (acl == NULL)
2615                 goto out;
2616         if (buf == NULL) /* user is just asking for length */
2617                 goto out_len;
2618         if (acl->cached == 0)
2619                 goto out;
2620         ret = -ERANGE; /* see getxattr(2) man page */
2621         if (acl->len > buflen)
2622                 goto out;
2623         memcpy(buf, acl->data, acl->len);
2624 out_len:
2625         ret = acl->len;
2626 out:
2627         spin_unlock(&inode->i_lock);
2628         return ret;
2629 }
2630
2631 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2632 {
2633         struct nfs4_cached_acl *acl;
2634
2635         if (buf && acl_len <= PAGE_SIZE) {
2636                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2637                 if (acl == NULL)
2638                         goto out;
2639                 acl->cached = 1;
2640                 memcpy(acl->data, buf, acl_len);
2641         } else {
2642                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2643                 if (acl == NULL)
2644                         goto out;
2645                 acl->cached = 0;
2646         }
2647         acl->len = acl_len;
2648 out:
2649         nfs4_set_cached_acl(inode, acl);
2650 }
2651
2652 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2653 {
2654         struct page *pages[NFS4ACL_MAXPAGES];
2655         struct nfs_getaclargs args = {
2656                 .fh = NFS_FH(inode),
2657                 .acl_pages = pages,
2658                 .acl_len = buflen,
2659         };
2660         size_t resp_len = buflen;
2661         void *resp_buf;
2662         struct rpc_message msg = {
2663                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2664                 .rpc_argp = &args,
2665                 .rpc_resp = &resp_len,
2666         };
2667         struct page *localpage = NULL;
2668         int ret;
2669
2670         if (buflen < PAGE_SIZE) {
2671                 /* As long as we're doing a round trip to the server anyway,
2672                  * let's be prepared for a page of acl data. */
2673                 localpage = alloc_page(GFP_KERNEL);
2674                 resp_buf = page_address(localpage);
2675                 if (localpage == NULL)
2676                         return -ENOMEM;
2677                 args.acl_pages[0] = localpage;
2678                 args.acl_pgbase = 0;
2679                 resp_len = args.acl_len = PAGE_SIZE;
2680         } else {
2681                 resp_buf = buf;
2682                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2683         }
2684         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2685         if (ret)
2686                 goto out_free;
2687         if (resp_len > args.acl_len)
2688                 nfs4_write_cached_acl(inode, NULL, resp_len);
2689         else
2690                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2691         if (buf) {
2692                 ret = -ERANGE;
2693                 if (resp_len > buflen)
2694                         goto out_free;
2695                 if (localpage)
2696                         memcpy(buf, resp_buf, resp_len);
2697         }
2698         ret = resp_len;
2699 out_free:
2700         if (localpage)
2701                 __free_page(localpage);
2702         return ret;
2703 }
2704
2705 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2706 {
2707         struct nfs4_exception exception = { };
2708         ssize_t ret;
2709         do {
2710                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2711                 if (ret >= 0)
2712                         break;
2713                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2714         } while (exception.retry);
2715         return ret;
2716 }
2717
2718 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2719 {
2720         struct nfs_server *server = NFS_SERVER(inode);
2721         int ret;
2722
2723         if (!nfs4_server_supports_acls(server))
2724                 return -EOPNOTSUPP;
2725         ret = nfs_revalidate_inode(server, inode);
2726         if (ret < 0)
2727                 return ret;
2728         ret = nfs4_read_cached_acl(inode, buf, buflen);
2729         if (ret != -ENOENT)
2730                 return ret;
2731         return nfs4_get_acl_uncached(inode, buf, buflen);
2732 }
2733
2734 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2735 {
2736         struct nfs_server *server = NFS_SERVER(inode);
2737         struct page *pages[NFS4ACL_MAXPAGES];
2738         struct nfs_setaclargs arg = {
2739                 .fh             = NFS_FH(inode),
2740                 .acl_pages      = pages,
2741                 .acl_len        = buflen,
2742         };
2743         struct rpc_message msg = {
2744                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2745                 .rpc_argp       = &arg,
2746                 .rpc_resp       = NULL,
2747         };
2748         int ret;
2749
2750         if (!nfs4_server_supports_acls(server))
2751                 return -EOPNOTSUPP;
2752         nfs_inode_return_delegation(inode);
2753         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2754         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2755         nfs_zap_caches(inode);
2756         return ret;
2757 }
2758
2759 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2760 {
2761         struct nfs4_exception exception = { };
2762         int err;
2763         do {
2764                 err = nfs4_handle_exception(NFS_SERVER(inode),
2765                                 __nfs4_proc_set_acl(inode, buf, buflen),
2766                                 &exception);
2767         } while (exception.retry);
2768         return err;
2769 }
2770
2771 static int
2772 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2773 {
2774         struct nfs_client *clp = server->nfs_client;
2775
2776         if (!clp || task->tk_status >= 0)
2777                 return 0;
2778         switch(task->tk_status) {
2779                 case -NFS4ERR_STALE_CLIENTID:
2780                 case -NFS4ERR_STALE_STATEID:
2781                 case -NFS4ERR_EXPIRED:
2782                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2783                         nfs4_schedule_state_recovery(clp);
2784                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2785                                 rpc_wake_up_task(task);
2786                         task->tk_status = 0;
2787                         return -EAGAIN;
2788                 case -NFS4ERR_DELAY:
2789                         nfs_inc_server_stats((struct nfs_server *) server,
2790                                                 NFSIOS_DELAY);
2791                 case -NFS4ERR_GRACE:
2792                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2793                         task->tk_status = 0;
2794                         return -EAGAIN;
2795                 case -NFS4ERR_OLD_STATEID:
2796                         task->tk_status = 0;
2797                         return -EAGAIN;
2798         }
2799         task->tk_status = nfs4_map_errors(task->tk_status);
2800         return 0;
2801 }
2802
2803 static int nfs4_wait_bit_interruptible(void *word)
2804 {
2805         if (signal_pending(current))
2806                 return -ERESTARTSYS;
2807         schedule();
2808         return 0;
2809 }
2810
2811 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2812 {
2813         sigset_t oldset;
2814         int res;
2815
2816         might_sleep();
2817
2818         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2819
2820         rpc_clnt_sigmask(clnt, &oldset);
2821         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2822                         nfs4_wait_bit_interruptible,
2823                         TASK_INTERRUPTIBLE);
2824         rpc_clnt_sigunmask(clnt, &oldset);
2825
2826         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2827         return res;
2828 }
2829
2830 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2831 {
2832         sigset_t oldset;
2833         int res = 0;
2834
2835         might_sleep();
2836
2837         if (*timeout <= 0)
2838                 *timeout = NFS4_POLL_RETRY_MIN;
2839         if (*timeout > NFS4_POLL_RETRY_MAX)
2840                 *timeout = NFS4_POLL_RETRY_MAX;
2841         rpc_clnt_sigmask(clnt, &oldset);
2842         if (clnt->cl_intr) {
2843                 schedule_timeout_interruptible(*timeout);
2844                 if (signalled())
2845                         res = -ERESTARTSYS;
2846         } else
2847                 schedule_timeout_uninterruptible(*timeout);
2848         rpc_clnt_sigunmask(clnt, &oldset);
2849         *timeout <<= 1;
2850         return res;
2851 }
2852
2853 /* This is the error handling routine for processes that are allowed
2854  * to sleep.
2855  */
2856 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2857 {
2858         struct nfs_client *clp = server->nfs_client;
2859         int ret = errorcode;
2860
2861         exception->retry = 0;
2862         switch(errorcode) {
2863                 case 0:
2864                         return 0;
2865                 case -NFS4ERR_STALE_CLIENTID:
2866                 case -NFS4ERR_STALE_STATEID:
2867                 case -NFS4ERR_EXPIRED:
2868                         nfs4_schedule_state_recovery(clp);
2869                         ret = nfs4_wait_clnt_recover(server->client, clp);
2870                         if (ret == 0)
2871                                 exception->retry = 1;
2872                         break;
2873                 case -NFS4ERR_FILE_OPEN:
2874                 case -NFS4ERR_GRACE:
2875                 case -NFS4ERR_DELAY:
2876                         ret = nfs4_delay(server->client, &exception->timeout);
2877                         if (ret != 0)
2878                                 break;
2879                 case -NFS4ERR_OLD_STATEID:
2880                         exception->retry = 1;
2881         }
2882         /* We failed to handle the error */
2883         return nfs4_map_errors(ret);
2884 }
2885
2886 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2887 {
2888         nfs4_verifier sc_verifier;
2889         struct nfs4_setclientid setclientid = {
2890                 .sc_verifier = &sc_verifier,
2891                 .sc_prog = program,
2892         };
2893         struct rpc_message msg = {
2894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2895                 .rpc_argp = &setclientid,
2896                 .rpc_resp = clp,
2897                 .rpc_cred = cred,
2898         };
2899         __be32 *p;
2900         int loop = 0;
2901         int status;
2902
2903         p = (__be32*)sc_verifier.data;
2904         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2905         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2906
2907         for(;;) {
2908                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2909                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2910                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2911                                 cred->cr_ops->cr_name,
2912                                 clp->cl_id_uniquifier);
2913                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2914                                 sizeof(setclientid.sc_netid), "tcp");
2915                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2916                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2917                                 clp->cl_ipaddr, port >> 8, port & 255);
2918
2919                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2920                 if (status != -NFS4ERR_CLID_INUSE)
2921                         break;
2922                 if (signalled())
2923                         break;
2924                 if (loop++ & 1)
2925                         ssleep(clp->cl_lease_time + 1);
2926                 else
2927                         if (++clp->cl_id_uniquifier == 0)
2928                                 break;
2929         }
2930         return status;
2931 }
2932
2933 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2934 {
2935         struct nfs_fsinfo fsinfo;
2936         struct rpc_message msg = {
2937                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2938                 .rpc_argp = clp,
2939                 .rpc_resp = &fsinfo,
2940                 .rpc_cred = cred,
2941         };
2942         unsigned long now;
2943         int status;
2944
2945         now = jiffies;
2946         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2947         if (status == 0) {
2948                 spin_lock(&clp->cl_lock);
2949                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2950                 clp->cl_last_renewal = now;
2951                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2952                 spin_unlock(&clp->cl_lock);
2953         }
2954         return status;
2955 }
2956
2957 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2958 {
2959         long timeout;
2960         int err;
2961         do {
2962                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2963                 switch (err) {
2964                         case 0:
2965                                 return err;
2966                         case -NFS4ERR_RESOURCE:
2967                                 /* The IBM lawyers misread another document! */
2968                         case -NFS4ERR_DELAY:
2969                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2970                 }
2971         } while (err == 0);
2972         return err;
2973 }
2974
2975 struct nfs4_delegreturndata {
2976         struct nfs4_delegreturnargs args;
2977         struct nfs4_delegreturnres res;
2978         struct nfs_fh fh;
2979         nfs4_stateid stateid;
2980         struct rpc_cred *cred;
2981         unsigned long timestamp;
2982         struct nfs_fattr fattr;
2983         int rpc_status;
2984 };
2985
2986 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2987 {
2988         struct nfs4_delegreturndata *data = calldata;
2989         struct rpc_message msg = {
2990                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2991                 .rpc_argp = &data->args,
2992                 .rpc_resp = &data->res,
2993                 .rpc_cred = data->cred,
2994         };
2995         nfs_fattr_init(data->res.fattr);
2996         rpc_call_setup(task, &msg, 0);
2997 }
2998
2999 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3000 {
3001         struct nfs4_delegreturndata *data = calldata;
3002         data->rpc_status = task->tk_status;
3003         if (data->rpc_status == 0)
3004                 renew_lease(data->res.server, data->timestamp);
3005 }
3006
3007 static void nfs4_delegreturn_release(void *calldata)
3008 {
3009         struct nfs4_delegreturndata *data = calldata;
3010
3011         put_rpccred(data->cred);
3012         kfree(calldata);
3013 }
3014
3015 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3016         .rpc_call_prepare = nfs4_delegreturn_prepare,
3017         .rpc_call_done = nfs4_delegreturn_done,
3018         .rpc_release = nfs4_delegreturn_release,
3019 };
3020
3021 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3022 {
3023         struct nfs4_delegreturndata *data;
3024         struct nfs_server *server = NFS_SERVER(inode);
3025         struct rpc_task *task;
3026         int status;
3027
3028         data = kmalloc(sizeof(*data), GFP_KERNEL);
3029         if (data == NULL)
3030                 return -ENOMEM;
3031         data->args.fhandle = &data->fh;
3032         data->args.stateid = &data->stateid;
3033         data->args.bitmask = server->attr_bitmask;
3034         nfs_copy_fh(&data->fh, NFS_FH(inode));
3035         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3036         data->res.fattr = &data->fattr;
3037         data->res.server = server;
3038         data->cred = get_rpccred(cred);
3039         data->timestamp = jiffies;
3040         data->rpc_status = 0;
3041
3042         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3043         if (IS_ERR(task))
3044                 return PTR_ERR(task);
3045         status = nfs4_wait_for_completion_rpc_task(task);
3046         if (status == 0) {
3047                 status = data->rpc_status;
3048                 if (status == 0)
3049                         nfs_post_op_update_inode(inode, &data->fattr);
3050         }
3051         rpc_put_task(task);
3052         return status;
3053 }
3054
3055 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3056 {
3057         struct nfs_server *server = NFS_SERVER(inode);
3058         struct nfs4_exception exception = { };
3059         int err;
3060         do {
3061                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3062                 switch (err) {
3063                         case -NFS4ERR_STALE_STATEID:
3064                         case -NFS4ERR_EXPIRED:
3065                         case 0:
3066                                 return 0;
3067                 }
3068                 err = nfs4_handle_exception(server, err, &exception);
3069         } while (exception.retry);
3070         return err;
3071 }
3072
3073 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3074 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3075
3076 /*
3077  * sleep, with exponential backoff, and retry the LOCK operation.
3078  */
3079 static unsigned long
3080 nfs4_set_lock_task_retry(unsigned long timeout)
3081 {
3082         schedule_timeout_interruptible(timeout);
3083         timeout <<= 1;
3084         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3085                 return NFS4_LOCK_MAXTIMEOUT;
3086         return timeout;
3087 }
3088
3089 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3090 {
3091         struct inode *inode = state->inode;
3092         struct nfs_server *server = NFS_SERVER(inode);
3093         struct nfs_client *clp = server->nfs_client;
3094         struct nfs_lockt_args arg = {
3095                 .fh = NFS_FH(inode),
3096                 .fl = request,
3097         };
3098         struct nfs_lockt_res res = {
3099                 .denied = request,
3100         };
3101         struct rpc_message msg = {
3102                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3103                 .rpc_argp       = &arg,
3104                 .rpc_resp       = &res,
3105                 .rpc_cred       = state->owner->so_cred,
3106         };
3107         struct nfs4_lock_state *lsp;
3108         int status;
3109
3110         down_read(&clp->cl_sem);
3111         arg.lock_owner.clientid = clp->cl_clientid;
3112         status = nfs4_set_lock_state(state, request);
3113         if (status != 0)
3114                 goto out;
3115         lsp = request->fl_u.nfs4_fl.owner;
3116         arg.lock_owner.id = lsp->ls_id.id;
3117         status = rpc_call_sync(server->client, &msg, 0);
3118         switch (status) {
3119                 case 0:
3120                         request->fl_type = F_UNLCK;
3121                         break;
3122                 case -NFS4ERR_DENIED:
3123                         status = 0;
3124         }
3125         request->fl_ops->fl_release_private(request);
3126 out:
3127         up_read(&clp->cl_sem);
3128         return status;
3129 }
3130
3131 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3132 {
3133         struct nfs4_exception exception = { };
3134         int err;
3135
3136         do {
3137                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3138                                 _nfs4_proc_getlk(state, cmd, request),
3139                                 &exception);
3140         } while (exception.retry);
3141         return err;
3142 }
3143
3144 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3145 {
3146         int res = 0;
3147         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3148                 case FL_POSIX:
3149                         res = posix_lock_file_wait(file, fl);
3150                         break;
3151                 case FL_FLOCK:
3152                         res = flock_lock_file_wait(file, fl);
3153                         break;
3154                 default:
3155                         BUG();
3156         }
3157         return res;
3158 }
3159
3160 struct nfs4_unlockdata {
3161         struct nfs_locku_args arg;
3162         struct nfs_locku_res res;
3163         struct nfs4_lock_state *lsp;
3164         struct nfs_open_context *ctx;
3165         struct file_lock fl;
3166         const struct nfs_server *server;
3167         unsigned long timestamp;
3168 };
3169
3170 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3171                 struct nfs_open_context *ctx,
3172                 struct nfs4_lock_state *lsp,
3173                 struct nfs_seqid *seqid)
3174 {
3175         struct nfs4_unlockdata *p;
3176         struct inode *inode = lsp->ls_state->inode;
3177
3178         p = kmalloc(sizeof(*p), GFP_KERNEL);
3179         if (p == NULL)
3180                 return NULL;
3181         p->arg.fh = NFS_FH(inode);
3182         p->arg.fl = &p->fl;
3183         p->arg.seqid = seqid;
3184         p->arg.stateid = &lsp->ls_stateid;
3185         p->lsp = lsp;
3186         atomic_inc(&lsp->ls_count);
3187         /* Ensure we don't close file until we're done freeing locks! */
3188         p->ctx = get_nfs_open_context(ctx);
3189         memcpy(&p->fl, fl, sizeof(p->fl));
3190         p->server = NFS_SERVER(inode);
3191         return p;
3192 }
3193
3194 static void nfs4_locku_release_calldata(void *data)
3195 {
3196         struct nfs4_unlockdata *calldata = data;
3197         nfs_free_seqid(calldata->arg.seqid);
3198         nfs4_put_lock_state(calldata->lsp);
3199         put_nfs_open_context(calldata->ctx);
3200         kfree(calldata);
3201 }
3202
3203 static void nfs4_locku_done(struct rpc_task *task, void *data)
3204 {
3205         struct nfs4_unlockdata *calldata = data;
3206
3207         if (RPC_ASSASSINATED(task))
3208                 return;
3209         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3210         switch (task->tk_status) {
3211                 case 0:
3212                         memcpy(calldata->lsp->ls_stateid.data,
3213                                         calldata->res.stateid.data,
3214                                         sizeof(calldata->lsp->ls_stateid.data));
3215                         renew_lease(calldata->server, calldata->timestamp);
3216                         break;
3217                 case -NFS4ERR_STALE_STATEID:
3218                 case -NFS4ERR_EXPIRED:
3219                         break;
3220                 default:
3221                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3222                                 rpc_restart_call(task);
3223         }
3224 }
3225
3226 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3227 {
3228         struct nfs4_unlockdata *calldata = data;
3229         struct rpc_message msg = {
3230                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3231                 .rpc_argp       = &calldata->arg,
3232                 .rpc_resp       = &calldata->res,
3233                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3234         };
3235
3236         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3237                 return;
3238         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3239                 /* Note: exit _without_ running nfs4_locku_done */
3240                 task->tk_action = NULL;
3241                 return;
3242         }
3243         calldata->timestamp = jiffies;
3244         rpc_call_setup(task, &msg, 0);
3245 }
3246
3247 static const struct rpc_call_ops nfs4_locku_ops = {
3248         .rpc_call_prepare = nfs4_locku_prepare,
3249         .rpc_call_done = nfs4_locku_done,
3250         .rpc_release = nfs4_locku_release_calldata,
3251 };
3252
3253 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3254                 struct nfs_open_context *ctx,
3255                 struct nfs4_lock_state *lsp,
3256                 struct nfs_seqid *seqid)
3257 {
3258         struct nfs4_unlockdata *data;
3259
3260         /* Ensure this is an unlock - when canceling a lock, the
3261          * canceled lock is passed in, and it won't be an unlock.
3262          */
3263         fl->fl_type = F_UNLCK;
3264
3265         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3266         if (data == NULL) {
3267                 nfs_free_seqid(seqid);
3268                 return ERR_PTR(-ENOMEM);
3269         }
3270
3271         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3272 }
3273
3274 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3275 {
3276         struct nfs_seqid *seqid;
3277         struct nfs4_lock_state *lsp;
3278         struct rpc_task *task;
3279         int status = 0;
3280
3281         status = nfs4_set_lock_state(state, request);
3282         /* Unlock _before_ we do the RPC call */
3283         request->fl_flags |= FL_EXISTS;
3284         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3285                 goto out;
3286         if (status != 0)
3287                 goto out;
3288         /* Is this a delegated lock? */
3289         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3290                 goto out;
3291         lsp = request->fl_u.nfs4_fl.owner;
3292         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3293         status = -ENOMEM;
3294         if (seqid == NULL)
3295                 goto out;
3296         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3297         status = PTR_ERR(task);
3298         if (IS_ERR(task))
3299                 goto out;
3300         status = nfs4_wait_for_completion_rpc_task(task);
3301         rpc_put_task(task);
3302 out:
3303         return status;
3304 }
3305
3306 struct nfs4_lockdata {
3307         struct nfs_lock_args arg;
3308         struct nfs_lock_res res;
3309         struct nfs4_lock_state *lsp;
3310         struct nfs_open_context *ctx;
3311         struct file_lock fl;
3312         unsigned long timestamp;
3313         int rpc_status;
3314         int cancelled;
3315 };
3316
3317 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3318                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3319 {
3320         struct nfs4_lockdata *p;
3321         struct inode *inode = lsp->ls_state->inode;
3322         struct nfs_server *server = NFS_SERVER(inode);
3323
3324         p = kzalloc(sizeof(*p), GFP_KERNEL);
3325         if (p == NULL)
3326                 return NULL;
3327
3328         p->arg.fh = NFS_FH(inode);
3329         p->arg.fl = &p->fl;
3330         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3331         if (p->arg.lock_seqid == NULL)
3332                 goto out_free;
3333         p->arg.lock_stateid = &lsp->ls_stateid;
3334         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3335         p->arg.lock_owner.id = lsp->ls_id.id;
3336         p->lsp = lsp;
3337         atomic_inc(&lsp->ls_count);
3338         p->ctx = get_nfs_open_context(ctx);
3339         memcpy(&p->fl, fl, sizeof(p->fl));
3340         return p;
3341 out_free:
3342         kfree(p);
3343         return NULL;
3344 }
3345
3346 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3347 {
3348         struct nfs4_lockdata *data = calldata;
3349         struct nfs4_state *state = data->lsp->ls_state;
3350         struct nfs4_state_owner *sp = state->owner;
3351         struct rpc_message msg = {
3352                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3353                 .rpc_argp = &data->arg,
3354                 .rpc_resp = &data->res,
3355                 .rpc_cred = sp->so_cred,
3356         };
3357
3358         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3359                 return;
3360         dprintk("%s: begin!\n", __FUNCTION__);
3361         /* Do we need to do an open_to_lock_owner? */
3362         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3363                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3364                 if (data->arg.open_seqid == NULL) {
3365                         data->rpc_status = -ENOMEM;
3366                         task->tk_action = NULL;
3367                         goto out;
3368                 }
3369                 data->arg.open_stateid = &state->stateid;
3370                 data->arg.new_lock_owner = 1;
3371         }
3372         data->timestamp = jiffies;
3373         rpc_call_setup(task, &msg, 0);
3374 out:
3375         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3376 }
3377
3378 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3379 {
3380         struct nfs4_lockdata *data = calldata;
3381
3382         dprintk("%s: begin!\n", __FUNCTION__);
3383
3384         data->rpc_status = task->tk_status;
3385         if (RPC_ASSASSINATED(task))
3386                 goto out;
3387         if (data->arg.new_lock_owner != 0) {
3388                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3389                 if (data->rpc_status == 0)
3390                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3391                 else
3392                         goto out;
3393         }
3394         if (data->rpc_status == 0) {
3395                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3396                                         sizeof(data->lsp->ls_stateid.data));
3397                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3398                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3399         }
3400         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3401 out:
3402         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3403 }
3404
3405 static void nfs4_lock_release(void *calldata)
3406 {
3407         struct nfs4_lockdata *data = calldata;
3408
3409         dprintk("%s: begin!\n", __FUNCTION__);
3410         if (data->arg.open_seqid != NULL)
3411                 nfs_free_seqid(data->arg.open_seqid);
3412         if (data->cancelled != 0) {
3413                 struct rpc_task *task;
3414                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3415                                 data->arg.lock_seqid);
3416                 if (!IS_ERR(task))
3417                         rpc_put_task(task);
3418                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3419         } else
3420                 nfs_free_seqid(data->arg.lock_seqid);
3421         nfs4_put_lock_state(data->lsp);
3422         put_nfs_open_context(data->ctx);
3423         kfree(data);
3424         dprintk("%s: done!\n", __FUNCTION__);
3425 }
3426
3427 static const struct rpc_call_ops nfs4_lock_ops = {
3428         .rpc_call_prepare = nfs4_lock_prepare,
3429         .rpc_call_done = nfs4_lock_done,
3430         .rpc_release = nfs4_lock_release,
3431 };
3432
3433 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3434 {
3435         struct nfs4_lockdata *data;
3436         struct rpc_task *task;
3437         int ret;
3438
3439         dprintk("%s: begin!\n", __FUNCTION__);
3440         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3441                         fl->fl_u.nfs4_fl.owner);
3442         if (data == NULL)
3443                 return -ENOMEM;
3444         if (IS_SETLKW(cmd))
3445                 data->arg.block = 1;
3446         if (reclaim != 0)
3447                 data->arg.reclaim = 1;
3448         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3449                         &nfs4_lock_ops, data);
3450         if (IS_ERR(task))
3451                 return PTR_ERR(task);
3452         ret = nfs4_wait_for_completion_rpc_task(task);
3453         if (ret == 0) {
3454                 ret = data->rpc_status;
3455                 if (ret == -NFS4ERR_DENIED)
3456                         ret = -EAGAIN;
3457         } else
3458                 data->cancelled = 1;
3459         rpc_put_task(task);
3460         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3461         return ret;
3462 }
3463
3464 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3465 {
3466         struct nfs_server *server = NFS_SERVER(state->inode);
3467         struct nfs4_exception exception = { };
3468         int err;
3469
3470         do {
3471                 /* Cache the lock if possible... */
3472                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3473                         return 0;
3474                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3475                 if (err != -NFS4ERR_DELAY)
3476                         break;
3477                 nfs4_handle_exception(server, err, &exception);
3478         } while (exception.retry);
3479         return err;
3480 }
3481
3482 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3483 {
3484         struct nfs_server *server = NFS_SERVER(state->inode);
3485         struct nfs4_exception exception = { };
3486         int err;
3487
3488         err = nfs4_set_lock_state(state, request);
3489         if (err != 0)
3490                 return err;
3491         do {
3492                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3493                         return 0;
3494                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3495                 if (err != -NFS4ERR_DELAY)
3496                         break;
3497                 nfs4_handle_exception(server, err, &exception);
3498         } while (exception.retry);
3499         return err;
3500 }
3501
3502 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3503 {
3504         struct nfs_client *clp = state->owner->so_client;
3505         unsigned char fl_flags = request->fl_flags;
3506         int status;
3507
3508         /* Is this a delegated open? */
3509         status = nfs4_set_lock_state(state, request);
3510         if (status != 0)
3511                 goto out;
3512         request->fl_flags |= FL_ACCESS;
3513         status = do_vfs_lock(request->fl_file, request);
3514         if (status < 0)
3515                 goto out;
3516         down_read(&clp->cl_sem);
3517         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3518                 struct nfs_inode *nfsi = NFS_I(state->inode);
3519                 /* Yes: cache locks! */
3520                 down_read(&nfsi->rwsem);
3521                 /* ...but avoid races with delegation recall... */
3522                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3523                         request->fl_flags = fl_flags & ~FL_SLEEP;
3524                         status = do_vfs_lock(request->fl_file, request);
3525                         up_read(&nfsi->rwsem);
3526                         goto out_unlock;
3527                 }
3528                 up_read(&nfsi->rwsem);
3529         }
3530         status = _nfs4_do_setlk(state, cmd, request, 0);
3531         if (status != 0)
3532                 goto out_unlock;
3533         /* Note: we always want to sleep here! */
3534         request->fl_flags = fl_flags | FL_SLEEP;
3535         if (do_vfs_lock(request->fl_file, request) < 0)
3536                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3537 out_unlock:
3538         up_read(&clp->cl_sem);
3539 out:
3540         request->fl_flags = fl_flags;
3541         return status;
3542 }
3543
3544 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3545 {
3546         struct nfs4_exception exception = { };
3547         int err;
3548
3549         do {
3550                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3551                                 _nfs4_proc_setlk(state, cmd, request),
3552                                 &exception);
3553         } while (exception.retry);
3554         return err;
3555 }
3556
3557 static int
3558 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3559 {
3560         struct nfs_open_context *ctx;
3561         struct nfs4_state *state;
3562         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3563         int status;
3564
3565         /* verify open state */
3566         ctx = nfs_file_open_context(filp);
3567         state = ctx->state;
3568
3569         if (request->fl_start < 0 || request->fl_end < 0)
3570                 return -EINVAL;
3571
3572         if (IS_GETLK(cmd))
3573                 return nfs4_proc_getlk(state, F_GETLK, request);
3574
3575         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3576                 return -EINVAL;
3577
3578         if (request->fl_type == F_UNLCK)
3579                 return nfs4_proc_unlck(state, cmd, request);
3580
3581         do {
3582                 status = nfs4_proc_setlk(state, cmd, request);
3583                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3584                         break;
3585                 timeout = nfs4_set_lock_task_retry(timeout);
3586                 status = -ERESTARTSYS;
3587                 if (signalled())
3588                         break;
3589         } while(status < 0);
3590         return status;
3591 }
3592
3593 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3594 {
3595         struct nfs_server *server = NFS_SERVER(state->inode);
3596         struct nfs4_exception exception = { };
3597         int err;
3598
3599         err = nfs4_set_lock_state(state, fl);
3600         if (err != 0)
3601                 goto out;
3602         do {
3603                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3604                 if (err != -NFS4ERR_DELAY)
3605                         break;
3606                 err = nfs4_handle_exception(server, err, &exception);
3607         } while (exception.retry);
3608 out:
3609         return err;
3610 }
3611
3612 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3613
3614 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3615                 size_t buflen, int flags)
3616 {
3617         struct inode *inode = dentry->d_inode;
3618
3619         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3620                 return -EOPNOTSUPP;
3621
3622         if (!S_ISREG(inode->i_mode) &&
3623             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3624                 return -EPERM;
3625
3626         return nfs4_proc_set_acl(inode, buf, buflen);
3627 }
3628
3629 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3630  * and that's what we'll do for e.g. user attributes that haven't been set.
3631  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3632  * attributes in kernel-managed attribute namespaces. */
3633 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3634                 size_t buflen)
3635 {
3636         struct inode *inode = dentry->d_inode;
3637
3638         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3639                 return -EOPNOTSUPP;
3640
3641         return nfs4_proc_get_acl(inode, buf, buflen);
3642 }
3643
3644 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3645 {
3646         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3647
3648         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3649                 return 0;
3650         if (buf && buflen < len)
3651                 return -ERANGE;
3652         if (buf)
3653                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3654         return len;
3655 }
3656
3657 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3658                 struct nfs4_fs_locations *fs_locations, struct page *page)
3659 {
3660         struct nfs_server *server = NFS_SERVER(dir);
3661         u32 bitmask[2] = {
3662                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3663                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3664         };
3665         struct nfs4_fs_locations_arg args = {
3666                 .dir_fh = NFS_FH(dir),
3667                 .name = name,
3668                 .page = page,
3669                 .bitmask = bitmask,
3670         };
3671         struct rpc_message msg = {
3672                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3673                 .rpc_argp = &args,
3674                 .rpc_resp = fs_locations,
3675         };
3676         int status;
3677
3678         dprintk("%s: start\n", __FUNCTION__);
3679         nfs_fattr_init(&fs_locations->fattr);
3680         fs_locations->server = server;
3681         fs_locations->nlocations = 0;
3682         status = rpc_call_sync(server->client, &msg, 0);
3683         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3684         return status;
3685 }
3686
3687 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3688         .recover_open   = nfs4_open_reclaim,
3689         .recover_lock   = nfs4_lock_reclaim,
3690 };
3691
3692 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3693         .recover_open   = nfs4_open_expired,
3694         .recover_lock   = nfs4_lock_expired,
3695 };
3696
3697 static const struct inode_operations nfs4_file_inode_operations = {
3698         .permission     = nfs_permission,
3699         .getattr        = nfs_getattr,
3700         .setattr        = nfs_setattr,
3701         .getxattr       = nfs4_getxattr,
3702         .setxattr       = nfs4_setxattr,
3703         .listxattr      = nfs4_listxattr,
3704 };
3705
3706 const struct nfs_rpc_ops nfs_v4_clientops = {
3707         .version        = 4,                    /* protocol version */
3708         .dentry_ops     = &nfs4_dentry_operations,
3709         .dir_inode_ops  = &nfs4_dir_inode_operations,
3710         .file_inode_ops = &nfs4_file_inode_operations,
3711         .getroot        = nfs4_proc_get_root,
3712         .getattr        = nfs4_proc_getattr,
3713         .setattr        = nfs4_proc_setattr,
3714         .lookupfh       = nfs4_proc_lookupfh,
3715         .lookup         = nfs4_proc_lookup,
3716         .access         = nfs4_proc_access,
3717         .readlink       = nfs4_proc_readlink,
3718         .create         = nfs4_proc_create,
3719         .remove         = nfs4_proc_remove,
3720         .unlink_setup   = nfs4_proc_unlink_setup,
3721         .unlink_done    = nfs4_proc_unlink_done,
3722         .rename         = nfs4_proc_rename,
3723         .link           = nfs4_proc_link,
3724         .symlink        = nfs4_proc_symlink,
3725         .mkdir          = nfs4_proc_mkdir,
3726         .rmdir          = nfs4_proc_remove,
3727         .readdir        = nfs4_proc_readdir,
3728         .mknod          = nfs4_proc_mknod,
3729         .statfs         = nfs4_proc_statfs,
3730         .fsinfo         = nfs4_proc_fsinfo,
3731         .pathconf       = nfs4_proc_pathconf,
3732         .set_capabilities = nfs4_server_capabilities,
3733         .decode_dirent  = nfs4_decode_dirent,
3734         .read_setup     = nfs4_proc_read_setup,
3735         .read_done      = nfs4_read_done,
3736         .write_setup    = nfs4_proc_write_setup,
3737         .write_done     = nfs4_write_done,
3738         .commit_setup   = nfs4_proc_commit_setup,
3739         .commit_done    = nfs4_commit_done,
3740         .file_open      = nfs_open,
3741         .file_release   = nfs_release,
3742         .lock           = nfs4_proc_lock,
3743         .clear_acl_cache = nfs4_zap_acl_attr,
3744 };
3745
3746 /*
3747  * Local variables:
3748  *  c-basic-offset: 8
3749  * End:
3750  */